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PMID:28666 | Digestive-absorptive function of the intestinal brush border in uremia. | Amino acid absorption was studied in chronic uremic rats. Intestinal transport of L-leucine appears to be inhibited with mild uremic intoxication, whereas severe uremia enhances absorption. Brush border activity of intestinal maltase and disaccharidases is higher in rats with chronic renal insufficiency. The same holds for gamma-glutamyl-transpeptidase activity. | Digestive-absorptive function of the intestinal brush border in uremia. Amino acid absorption was studied in chronic uremic rats. Intestinal transport of L-leucine appears to be inhibited with mild uremic intoxication, whereas severe uremia enhances absorption. Brush border activity of intestinal maltase and disaccharidases is higher in rats with chronic renal insufficiency. The same holds for gamma-glutamyl-transpeptidase activity. | [
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PMID:28667 | Ulcerative colitis in association with Takayasu's disease. | A case of total ulcerative colitis associated with large-vessel disease consistent with a diagnosis of Takayasu's disease is described in a 21-year-old Pakistani female. The possible relationship between the two disorders is discussed. | Ulcerative colitis in association with Takayasu's disease. A case of total ulcerative colitis associated with large-vessel disease consistent with a diagnosis of Takayasu's disease is described in a 21-year-old Pakistani female. The possible relationship between the two disorders is discussed. | [
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PMID:28670 | Persistent pulmonary hypertension in the neonate: development of an animal model. | Chronic intrauterine hypoxia was induced in third-trimester lamb fetuses by daily embolization of the maternal side of the placenta with nonradioactive microspheres. After delivery at term, the chronically hypoxic fetuses had significantly increased pulmonary artery pressures when compared to nonhypoxic control measurements. This preparation appears to be a satisfactory model for experimental study of persistent pulmonary hypertension in the neonate. | Persistent pulmonary hypertension in the neonate: development of an animal model. Chronic intrauterine hypoxia was induced in third-trimester lamb fetuses by daily embolization of the maternal side of the placenta with nonradioactive microspheres. After delivery at term, the chronically hypoxic fetuses had significantly increased pulmonary artery pressures when compared to nonhypoxic control measurements. This preparation appears to be a satisfactory model for experimental study of persistent pulmonary hypertension in the neonate. | [
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PMID:28671 | Evaluation of continuous monitoring of tissue pH in cats. | An improved continuous tissue pH monitoring system, designed for human subcutaneous fetal scalp tissue, was evaluated in 10 cats for total of 60 hours. Respiratory acidosis was induced with and without hypoxia to model the pathology of human clinical fetal distress. Arterial and venous pH were sampled every 15 minutes and the values were compared to those from the pH monitor system. The values paralleled arterial and venous blood pH, with correlation coefficients up to 0.98 under various pathologic acidotic conditions. | Evaluation of continuous monitoring of tissue pH in cats. An improved continuous tissue pH monitoring system, designed for human subcutaneous fetal scalp tissue, was evaluated in 10 cats for total of 60 hours. Respiratory acidosis was induced with and without hypoxia to model the pathology of human clinical fetal distress. Arterial and venous pH were sampled every 15 minutes and the values were compared to those from the pH monitor system. The values paralleled arterial and venous blood pH, with correlation coefficients up to 0.98 under various pathologic acidotic conditions. | [
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PMID:28672 | Effects of endotoxin on the pregnant baboon and fetus. | Effects of E. coli endotoxin upon uterine activity and maternal and fetal condition were studied in four pregnant baboons and their fetuses. Uterine activity increased significantly following administration of endotoxin to the mother. Endotoxin also produced maternal circulatory collapse, severe acidosis, and profound fetal asphyxia resulting in death. Death also occurred in three of the four mothers within 24 hours without amelioration of their conditions. | Effects of endotoxin on the pregnant baboon and fetus. Effects of E. coli endotoxin upon uterine activity and maternal and fetal condition were studied in four pregnant baboons and their fetuses. Uterine activity increased significantly following administration of endotoxin to the mother. Endotoxin also produced maternal circulatory collapse, severe acidosis, and profound fetal asphyxia resulting in death. Death also occurred in three of the four mothers within 24 hours without amelioration of their conditions. | [
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PMID:28673 | Electron microscopy of nephropathia epidemica. Renal tubular basement membrane. | Tubular basement membranes in kidney biopsies from 18 patients with nephropathia epidemica were studied by electron microscopy. Both in the cortex and in the medulla there was splitting of the basement membrane. Thickened basement membrane around occasional tubules contained membrane vesicles, usually empty but also with a core and a diameter of approximately 180 nm. Membranous convoluted structures and light finely fibrillar areas in the basement membranes were seen. Splitting of the basement membrane was most prominent in the medulla, and the membrane was filled with round to oval particles 55 to 470 nm in diameter. Of the possible mechanisms of damage at the basement membrane level in this disease, the findings suggest liberation of antigen from the tubular cells and reaction of circulating antibodies with the antigen in the basement membrane. | Electron microscopy of nephropathia epidemica. Renal tubular basement membrane. Tubular basement membranes in kidney biopsies from 18 patients with nephropathia epidemica were studied by electron microscopy. Both in the cortex and in the medulla there was splitting of the basement membrane. Thickened basement membrane around occasional tubules contained membrane vesicles, usually empty but also with a core and a diameter of approximately 180 nm. Membranous convoluted structures and light finely fibrillar areas in the basement membranes were seen. Splitting of the basement membrane was most prominent in the medulla, and the membrane was filled with round to oval particles 55 to 470 nm in diameter. Of the possible mechanisms of damage at the basement membrane level in this disease, the findings suggest liberation of antigen from the tubular cells and reaction of circulating antibodies with the antigen in the basement membrane. | [
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PMID:28674 | Demethylation in erythrocytes: a reaction involving hemoglobin. | A reaction is described in erythrocytes of rat and of man whereby O-methylated metabolites of the catecholamines are demethylated to the corresponding catechols. The reaction was studied by incubating aliquots of erythrocyte lysates with radiolabeled O-methylated compounds and isolating the catechol product by alumina adsorption chromatography. The demethylating activity was located in the cytosol of the erythrocytes. Evidence was strong that oxyhemoglobin was responsible for the reaction: the demethylase activity was inseparable from oxyhemoglobin in several chromatographic separations. In addition, although commercially available hemoglobins were inactive in the reactions, after their conversion to oxyhemoglobin and purification, they did effect demethylation. Methemoglobin did not demethylate guaiacols and in fact inhibited demethylation by oxyhemoglobin. The reaction was inhibited by the addition of reduced pyridine nucleotides and of the methyl acceptor tetrahydrofolic acid. | Demethylation in erythrocytes: a reaction involving hemoglobin. A reaction is described in erythrocytes of rat and of man whereby O-methylated metabolites of the catecholamines are demethylated to the corresponding catechols. The reaction was studied by incubating aliquots of erythrocyte lysates with radiolabeled O-methylated compounds and isolating the catechol product by alumina adsorption chromatography. The demethylating activity was located in the cytosol of the erythrocytes. Evidence was strong that oxyhemoglobin was responsible for the reaction: the demethylase activity was inseparable from oxyhemoglobin in several chromatographic separations. In addition, although commercially available hemoglobins were inactive in the reactions, after their conversion to oxyhemoglobin and purification, they did effect demethylation. Methemoglobin did not demethylate guaiacols and in fact inhibited demethylation by oxyhemoglobin. The reaction was inhibited by the addition of reduced pyridine nucleotides and of the methyl acceptor tetrahydrofolic acid. | [
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PMID:28675 | H + transport in urinary epithelia. | This review of urinary acidification is primarily based on studies in isolated epithelia such as the turtle bladder. Despite the lack of unambiguous proof, the wealth of indirect evidence suggests that the cause of bicarbonate absorption is H+ secretion into the lumen. The mechanisms that regulate H+ transport are discussed. The electrochemical gradient for protons across the membrane is found to be the most fundamental regulator not only of passive movement but also of active transport. CO2 and aldosterone stimulate H+ transport, the latter by a mechanism apparently separate from the effect of this hormone on sodium transport. Although carbonic anhydrase activity is important for optimal function of the H+ pump, the results with carbonic anhydrase inhibitors need to be interpreted with caution. The evidence for Na:H exchange is reviewed and found to be not very persuasive, The metabolic pathways that fuel H+ transport are found to be all the major energy-yielding reactions in the cell, but particular prominence is given to the new discovery of the role of the pentose shunt in energizing transport. Finally, I discuss the important role H+ transport in energy transduction in subcellular organelles. | H + transport in urinary epithelia. This review of urinary acidification is primarily based on studies in isolated epithelia such as the turtle bladder. Despite the lack of unambiguous proof, the wealth of indirect evidence suggests that the cause of bicarbonate absorption is H+ secretion into the lumen. The mechanisms that regulate H+ transport are discussed. The electrochemical gradient for protons across the membrane is found to be the most fundamental regulator not only of passive movement but also of active transport. CO2 and aldosterone stimulate H+ transport, the latter by a mechanism apparently separate from the effect of this hormone on sodium transport. Although carbonic anhydrase activity is important for optimal function of the H+ pump, the results with carbonic anhydrase inhibitors need to be interpreted with caution. The evidence for Na:H exchange is reviewed and found to be not very persuasive, The metabolic pathways that fuel H+ transport are found to be all the major energy-yielding reactions in the cell, but particular prominence is given to the new discovery of the role of the pentose shunt in energizing transport. Finally, I discuss the important role H+ transport in energy transduction in subcellular organelles. | [
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PMID:28676 | Hemodynamic functions and blood viscosity in surface hypothermia. | Hemodynamic functions and blood viscosity changes in hypothermia (core approximately 25 degrees C) were studied in 14 pentobarbital-anesthetized dogs subjected to surface cooling. The viscosity of blood (eta B) increased progressively to 173% of that at 37 degrees C when body temperature was lowered to 25 degrees C. The increase in blood viscosity was caused by: a) the direct effect of low temperature on plasma viscosity, b) hemoconcentration as a result of plasma loss, and c) the low-flow (low-shear) state induced by hypothermia. A larger portion of the increased viscosity was caused by the low-flow state in hypothermia. The systemic flow resistance (SFR) increased to 271% of control, and this was attributable about equally to the increases in blood viscosity and systemic vascular hindrance (SFR/eta B). Similarly, the viscosity of blood contributed significantly to raising the pulmonary flow resistance. The relative constancy of mixed venous O2 saturation suggests that the cardiac output at low body temperature is generally adequate to meet the metabolic needs. | Hemodynamic functions and blood viscosity in surface hypothermia. Hemodynamic functions and blood viscosity changes in hypothermia (core approximately 25 degrees C) were studied in 14 pentobarbital-anesthetized dogs subjected to surface cooling. The viscosity of blood (eta B) increased progressively to 173% of that at 37 degrees C when body temperature was lowered to 25 degrees C. The increase in blood viscosity was caused by: a) the direct effect of low temperature on plasma viscosity, b) hemoconcentration as a result of plasma loss, and c) the low-flow (low-shear) state induced by hypothermia. A larger portion of the increased viscosity was caused by the low-flow state in hypothermia. The systemic flow resistance (SFR) increased to 271% of control, and this was attributable about equally to the increases in blood viscosity and systemic vascular hindrance (SFR/eta B). Similarly, the viscosity of blood contributed significantly to raising the pulmonary flow resistance. The relative constancy of mixed venous O2 saturation suggests that the cardiac output at low body temperature is generally adequate to meet the metabolic needs. | [
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PMID:28677 | Field survey of enteric viruses in solid waste landfill leachates. | Because municipal solid waste may contain fecal material from a variety of sources, there is concern that the leachate discharged from some solid waste landfills may contain enteric pathogens, including enteric viruses. In this study, 22 leachate samples from 21 different landfills in the United States and Canada were examined for enteric viruses. The sites represented a broad range of conditions for solid waste landfills and the leachate samples ranged from 10.3 to 18 liters in volume. Enteric viruses were found in only one of the 22 leachate samples examined. Two viruses, identified as poliovirus types 1 and 3, were found in an 11.8 liter sample obtained from a site where solid waste landfill practice was deficient. The low levels of enteric viruses detected in field samples of raw leachate and the opportunities for further reductions in the virus concentration of leachates by such processes as thermal inactivation, removal by soil and dilution in ground and surface waters, suggest that leachates from properly operated solid waste landfills do not constitute an environmental or public health hazard due to enteric viruses. | Field survey of enteric viruses in solid waste landfill leachates. Because municipal solid waste may contain fecal material from a variety of sources, there is concern that the leachate discharged from some solid waste landfills may contain enteric pathogens, including enteric viruses. In this study, 22 leachate samples from 21 different landfills in the United States and Canada were examined for enteric viruses. The sites represented a broad range of conditions for solid waste landfills and the leachate samples ranged from 10.3 to 18 liters in volume. Enteric viruses were found in only one of the 22 leachate samples examined. Two viruses, identified as poliovirus types 1 and 3, were found in an 11.8 liter sample obtained from a site where solid waste landfill practice was deficient. The low levels of enteric viruses detected in field samples of raw leachate and the opportunities for further reductions in the virus concentration of leachates by such processes as thermal inactivation, removal by soil and dilution in ground and surface waters, suggest that leachates from properly operated solid waste landfills do not constitute an environmental or public health hazard due to enteric viruses. | [
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PMID:28678 | The effect of pH on platelet and coagulation factor activities. | After observing that lavage of the stomach with alkaline solutions has a beneficial effect on the control of gastric hemorrhage, we examined the platelet and coagulation factor activities under conditions of lower and elevated pH. The results showed that change of the pH from acidosis to 7.0 and even to slight alkalosis induces platelet aggregation, platelet calcium and serotonin release, as well as platelet factor II availability. The prothrombin and partial thromboplastin times approached normal levels, whereas the fibrinogen level did not change significantly. The results obtained may serve as an explanation for the control of the intragastric bleeding in patients treated by maintenance of their gastric pH at 7.0. | The effect of pH on platelet and coagulation factor activities. After observing that lavage of the stomach with alkaline solutions has a beneficial effect on the control of gastric hemorrhage, we examined the platelet and coagulation factor activities under conditions of lower and elevated pH. The results showed that change of the pH from acidosis to 7.0 and even to slight alkalosis induces platelet aggregation, platelet calcium and serotonin release, as well as platelet factor II availability. The prothrombin and partial thromboplastin times approached normal levels, whereas the fibrinogen level did not change significantly. The results obtained may serve as an explanation for the control of the intragastric bleeding in patients treated by maintenance of their gastric pH at 7.0. | [
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PMID:28682 | Glutathione depletion following inhalation anesthesia. | Glutathione depletion following inhalation of halogenated anesthetics was investigated as a possible mechanism of toxic reactions associated with anesthesia. Concentrations of reduced glutathione were measured in the blood, liver, lung and kidney of the mouse after anesthesia with enflurane, fluroxene, halothane, isoflurane, methoxyflurane, or trichloroethylene. The anesthetic had no effect on glutathione concentrations in tissues except when fluroxene was used. After two hours of fluroxene anesthesia, glutathione in liver, lung, kidney, and blood was depleted by 93, 85, 85, and 61 per cent, respectively. The depletion was dose-dependent and was more extensive in animals anesthetized after phenobarbital pretreatment. Glutathione was also depleted in livers and lungs of rats anesthetized with fluroxene (60 and 38 per cent, respectively). In blood of rhesus monkeys anesthetized with fluroxene, glutathione was depleted by only 13 per cent. Extents of glutathione depletion are related to fluroxene toxicities in the three species studied. | Glutathione depletion following inhalation anesthesia. Glutathione depletion following inhalation of halogenated anesthetics was investigated as a possible mechanism of toxic reactions associated with anesthesia. Concentrations of reduced glutathione were measured in the blood, liver, lung and kidney of the mouse after anesthesia with enflurane, fluroxene, halothane, isoflurane, methoxyflurane, or trichloroethylene. The anesthetic had no effect on glutathione concentrations in tissues except when fluroxene was used. After two hours of fluroxene anesthesia, glutathione in liver, lung, kidney, and blood was depleted by 93, 85, 85, and 61 per cent, respectively. The depletion was dose-dependent and was more extensive in animals anesthetized after phenobarbital pretreatment. Glutathione was also depleted in livers and lungs of rats anesthetized with fluroxene (60 and 38 per cent, respectively). In blood of rhesus monkeys anesthetized with fluroxene, glutathione was depleted by only 13 per cent. Extents of glutathione depletion are related to fluroxene toxicities in the three species studied. | [
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PMID:28683 | Systemic arterial blood pH servocontrol of mechanical ventilation. | Servocontrol of mechanical ventilation using systemic arterial blood pH, measured by a dual-function pH/PCO2 intra-arterial sensor, as the controlled variable uas carried out in 30 dogs anesthetized with pentobarbital, 30 mg/kg. The control loop consisted of the animal, an intra-arterial dual-function pH/PCO2 sensor and sensor amplifier, a controller, and a Siemans-Elema 900 servoventilator. The system responded appropriately to changes in set-point pH from 7.30 to 7.50, as well as to infusions of lactic acid, which, with the control loop open, decreased systemic arterial blood pH 0.1 TO 0.2 PH units. Long-term (16 hr) ventilation of one dog with the systemic arterial blood pH servocontrol ventilator was shown to be feasible. | Systemic arterial blood pH servocontrol of mechanical ventilation. Servocontrol of mechanical ventilation using systemic arterial blood pH, measured by a dual-function pH/PCO2 intra-arterial sensor, as the controlled variable uas carried out in 30 dogs anesthetized with pentobarbital, 30 mg/kg. The control loop consisted of the animal, an intra-arterial dual-function pH/PCO2 sensor and sensor amplifier, a controller, and a Siemans-Elema 900 servoventilator. The system responded appropriately to changes in set-point pH from 7.30 to 7.50, as well as to infusions of lactic acid, which, with the control loop open, decreased systemic arterial blood pH 0.1 TO 0.2 PH units. Long-term (16 hr) ventilation of one dog with the systemic arterial blood pH servocontrol ventilator was shown to be feasible. | [
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PMID:28684 | Inhibition of cutaneous and mucosal allergy with phenyltoloxamine. | A dose-and-time related-effect of oral phenyltoloxamine citrate, a Class I, H1 antihistamine compound, has been demonstrated against allergen-induced wheal-and-erythema skin reactions among 10 adults with a diagnosis of allergic rhinitis and seasonal pollinosis. Clinical improvement in the existing symptoms of rhinorrhea, nasal obstruction, pruritus and sneezing, showed a significant correlation with the inhibition of reagin-mediated skin reactivity caused by phenytoloxamine. No adverse side effects were observed. It can be concluded that oral phenyltoloxamine citrate possesses antihistaminic properties and a range of safety which make it a useful agent for the symptomatic management of upper respiratory allergy. | Inhibition of cutaneous and mucosal allergy with phenyltoloxamine. A dose-and-time related-effect of oral phenyltoloxamine citrate, a Class I, H1 antihistamine compound, has been demonstrated against allergen-induced wheal-and-erythema skin reactions among 10 adults with a diagnosis of allergic rhinitis and seasonal pollinosis. Clinical improvement in the existing symptoms of rhinorrhea, nasal obstruction, pruritus and sneezing, showed a significant correlation with the inhibition of reagin-mediated skin reactivity caused by phenytoloxamine. No adverse side effects were observed. It can be concluded that oral phenyltoloxamine citrate possesses antihistaminic properties and a range of safety which make it a useful agent for the symptomatic management of upper respiratory allergy. | [
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PMID:28686 | Serum medazepam, diazepam, and N-desmethyldiazepam levels after single and multiple oral doses of medazepam. | 20 mg of medazepam were taken by mouth by 9 healthy volunteers in an acute absorption study. About a 10-fold variation was found during the first 6 hours after the drug in individual serum medazepam, diazepam, and N-desmethyldiazepam levels. In a subacute study 10 mg of medazepam t.i.d. was given to 10 institutionalized mentally subnormal adults with emotional disorders. After 14 days' treatment serum N-desmethyldiazepam levels were generally above 800 ng/ml, 7 to 8 times higher than the serum medazepam or diazepam levels measured 12 hours after the last dose. No correlation was observed between the serum concentration and efficacy of medazepam. | Serum medazepam, diazepam, and N-desmethyldiazepam levels after single and multiple oral doses of medazepam. 20 mg of medazepam were taken by mouth by 9 healthy volunteers in an acute absorption study. About a 10-fold variation was found during the first 6 hours after the drug in individual serum medazepam, diazepam, and N-desmethyldiazepam levels. In a subacute study 10 mg of medazepam t.i.d. was given to 10 institutionalized mentally subnormal adults with emotional disorders. After 14 days' treatment serum N-desmethyldiazepam levels were generally above 800 ng/ml, 7 to 8 times higher than the serum medazepam or diazepam levels measured 12 hours after the last dose. No correlation was observed between the serum concentration and efficacy of medazepam. | [
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PMID:28687 | Effects of a new beta1-selective beta-blocker H 87/07 in angina pectoris. | The efficacy and toleration of a new beta1-selective beta-blocker, H 87/07, was compared with placebo in 33 patients with angina pectoris. The efficacy was evaluated using subjective assessments of attack rate and nitroglycerin consumption as well as objective assessments of exercise tolerance on a bicycle ergometer. H 87/07 significantly reduced the attack rate and the nitroglycerin consumption compared with placebo. The mean reduction amounted to 13 and 36% respectively. No significant differences were found between H 87/07 and placebo with regard to exercise tolerance. Due to high intrinsic stimulating activity (I.S.A.) H 87/07 altered the heart rate and blood pressure only slightly at rest but during exercise significant reductions were seen. Except for one patient who had cardiac decompensation on H 87/07 no side-effects of clinical importance were seen. No significant changes were seen with regard to the laboratory tests performed. | Effects of a new beta1-selective beta-blocker H 87/07 in angina pectoris. The efficacy and toleration of a new beta1-selective beta-blocker, H 87/07, was compared with placebo in 33 patients with angina pectoris. The efficacy was evaluated using subjective assessments of attack rate and nitroglycerin consumption as well as objective assessments of exercise tolerance on a bicycle ergometer. H 87/07 significantly reduced the attack rate and the nitroglycerin consumption compared with placebo. The mean reduction amounted to 13 and 36% respectively. No significant differences were found between H 87/07 and placebo with regard to exercise tolerance. Due to high intrinsic stimulating activity (I.S.A.) H 87/07 altered the heart rate and blood pressure only slightly at rest but during exercise significant reductions were seen. Except for one patient who had cardiac decompensation on H 87/07 no side-effects of clinical importance were seen. No significant changes were seen with regard to the laboratory tests performed. | [
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PMID:28690 | Chloramphenicol acetyltransferase of Bacteroides fragilis. | Chloramphenicol-resistant strains of Bacteroides fragilis (minimum inhibitory concentration, 12.5 mug/ml) were isolated from a stool specimen which contained multiply resistant Escherichia coli. The enzyme responsible for resistance, chloramphenicol acetyltransferase, was produced constitutively by these strains; the specific activity was 10-fold lower than that of the E. coli enzymes. Similar activity was not detected in susceptible B. fragilis strains, nor could it be induced by growth in the presence of chloramphenicol or by mutagenesis. The enzyme had a pH optimum of 7.8 and a molecular weight of approximately 89,000. The K(m) for chloramphenicol was 5.2 muM, and the enzyme was sensitive to inhibition by 5,5'-dithiobis-2-nitrobenzoic acid. The enzyme produced by an E. coli strain isolated from the same specimen had a similar K(m) and sensitivity to 5,5'-dithiobis-2-nitrobenzoic acid. | Chloramphenicol acetyltransferase of Bacteroides fragilis. Chloramphenicol-resistant strains of Bacteroides fragilis (minimum inhibitory concentration, 12.5 mug/ml) were isolated from a stool specimen which contained multiply resistant Escherichia coli. The enzyme responsible for resistance, chloramphenicol acetyltransferase, was produced constitutively by these strains; the specific activity was 10-fold lower than that of the E. coli enzymes. Similar activity was not detected in susceptible B. fragilis strains, nor could it be induced by growth in the presence of chloramphenicol or by mutagenesis. The enzyme had a pH optimum of 7.8 and a molecular weight of approximately 89,000. The K(m) for chloramphenicol was 5.2 muM, and the enzyme was sensitive to inhibition by 5,5'-dithiobis-2-nitrobenzoic acid. The enzyme produced by an E. coli strain isolated from the same specimen had a similar K(m) and sensitivity to 5,5'-dithiobis-2-nitrobenzoic acid. | [
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PMID:28691 | Biological effects of 5-carboxy-2'-deoxyuridine: hydrolysis product of 5-trifluoromethyl-2'-deoxyuridine. | 5-Carboxy-2'-deoxyuridine (5-COOH-2'-dUrd) is a product of the base-catalyzed hydrolysis of 5-trifluoromethyl-2'-deoxyuridine. Hydrolysis of 5-trifluoromethyl-2'-deoxyuridine to 5-COOH-2'-dUrd in phosphate-buffered saline was kinetically first order and was pH dependent. At 37 degrees C and pH 7.0, 7.5, and 8.0, hydrolysis occurred with rate constants of 4.19 x 10(-5), 9.30 x 10(-5), and 1.61 x 10(-4) s(-1), respectively, with corresponding half-lives of 45.7, 20.6, and 11.9 h. 5-COOH-2'-dUrd inhibited growth of HEp-2 cells by 21, 67, and 91% at 1.0, 10, and 100 muM, with no antiviral activity against herpes simplex virus type 1 or herpes simplex virus type 2 at 1.0 or 10 muM. Partial reversal of cytotoxicity in HEp-2 cells was achieved with orotidine, uridine, deoxythymidine, or deoxycytidine, whereas complete reversal of cytotoxic effects was achieved with simultaneous addition of deoxythymidine, deoxycytidine, and uridine. 5-COOH-2'-dUrd at 50 muM inhibited incorporation of [(14)C]orotate into RNA and DNA by 65 and 27%, respectively. 5-COOH-2'-dUrd had no effect on the incorporation of [(3)H]uridine into DNA or RNA. Because of the structural similarities to deoxythymidine, 5-COOH-2'-dUrd was tested as an inhibitor of deoxythymidine kinase. 5-COOH-2'-dUrd was neither a substrate nor an inhibitor of herpes simplex virus type 1 induced deoxythymidine kinase or HEp-2 cell deoxythymidine kinase. Based on these observations, the metabolic block induced by 5-COOH-2'-dUrd has been localized to the de novo pyrimidine biosynthetic pathway between orotate phosphoribosyl transferase and orotidine 5'-phosphate decarboxylase. | Biological effects of 5-carboxy-2'-deoxyuridine: hydrolysis product of 5-trifluoromethyl-2'-deoxyuridine. 5-Carboxy-2'-deoxyuridine (5-COOH-2'-dUrd) is a product of the base-catalyzed hydrolysis of 5-trifluoromethyl-2'-deoxyuridine. Hydrolysis of 5-trifluoromethyl-2'-deoxyuridine to 5-COOH-2'-dUrd in phosphate-buffered saline was kinetically first order and was pH dependent. At 37 degrees C and pH 7.0, 7.5, and 8.0, hydrolysis occurred with rate constants of 4.19 x 10(-5), 9.30 x 10(-5), and 1.61 x 10(-4) s(-1), respectively, with corresponding half-lives of 45.7, 20.6, and 11.9 h. 5-COOH-2'-dUrd inhibited growth of HEp-2 cells by 21, 67, and 91% at 1.0, 10, and 100 muM, with no antiviral activity against herpes simplex virus type 1 or herpes simplex virus type 2 at 1.0 or 10 muM. Partial reversal of cytotoxicity in HEp-2 cells was achieved with orotidine, uridine, deoxythymidine, or deoxycytidine, whereas complete reversal of cytotoxic effects was achieved with simultaneous addition of deoxythymidine, deoxycytidine, and uridine. 5-COOH-2'-dUrd at 50 muM inhibited incorporation of [(14)C]orotate into RNA and DNA by 65 and 27%, respectively. 5-COOH-2'-dUrd had no effect on the incorporation of [(3)H]uridine into DNA or RNA. Because of the structural similarities to deoxythymidine, 5-COOH-2'-dUrd was tested as an inhibitor of deoxythymidine kinase. 5-COOH-2'-dUrd was neither a substrate nor an inhibitor of herpes simplex virus type 1 induced deoxythymidine kinase or HEp-2 cell deoxythymidine kinase. Based on these observations, the metabolic block induced by 5-COOH-2'-dUrd has been localized to the de novo pyrimidine biosynthetic pathway between orotate phosphoribosyl transferase and orotidine 5'-phosphate decarboxylase. | [
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PMID:28692 | Streptococcin A-FF22: nisin-like antibiotic substance produced by a group A streptococcus. | Streptococcin A-FF22 (SA) was shown to occur as both a cell-associated (SA-CA) and an extracellular (SA-EX) component of cultures of the producer bacterium, group A streptococcus strain FF22. SA-CA was solubilized by chemical, enzymatic, and mechanical procedures, similar to those used to release M protein. The independence of SA and M protein in strain FF22 was established by chromatographic separation of the two proteins on the basis of molecular weight and isoelectric point differences between the two substances. Media supporting optimal growth of strain FF22 did not necessarily favor SA production. SA was not produced either at elevated temperatures (39 degrees C) or if the culture was maintained at pH 7 or higher. The release of SA from producer cells was enhanced at lower culture pH values. Much of the SA-CA activity seemed associated with the cell walls of the producer strain, and the nature of the binding appeared to be largely nonspecific in nature and attributable to electrostatic interaction. | Streptococcin A-FF22: nisin-like antibiotic substance produced by a group A streptococcus. Streptococcin A-FF22 (SA) was shown to occur as both a cell-associated (SA-CA) and an extracellular (SA-EX) component of cultures of the producer bacterium, group A streptococcus strain FF22. SA-CA was solubilized by chemical, enzymatic, and mechanical procedures, similar to those used to release M protein. The independence of SA and M protein in strain FF22 was established by chromatographic separation of the two proteins on the basis of molecular weight and isoelectric point differences between the two substances. Media supporting optimal growth of strain FF22 did not necessarily favor SA production. SA was not produced either at elevated temperatures (39 degrees C) or if the culture was maintained at pH 7 or higher. The release of SA from producer cells was enhanced at lower culture pH values. Much of the SA-CA activity seemed associated with the cell walls of the producer strain, and the nature of the binding appeared to be largely nonspecific in nature and attributable to electrostatic interaction. | [
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PMID:28693 | Mechanism of the antimicrobial action of pyrithione: effects on membrane transport, ATP levels, and protein synthesis. | Pyrithione is a general inhibitor of membrane transport processes in fungi. A brief preincubation of Penicillium mycelia with pyrithione resulted in a marked decrease in the activities of a variety of independently regulated transport systems, including those for inorganic sulfate, inorganic phosphate, methylamine (actually, the NH(4) (+) permease), choline-O-sulfate, glucose, l-methionine (a specific system), and several hydrophobic l-alpha-amino acids (the general amino acid permease). The degree of inhibition at any fixed pyrithione concentration and exposure time increased as the pH of the incubation medium was decreased. This result strongly suggests that the active species is the un-ionized molecule and that pyrithione acts by collapsing a transmembrane DeltapH driving force. The degree of transport inhibition caused by a given concentration of pyrithione increased with increasing time of exposure to the inhibitor. However, exposure time and pyrithione concentration were not reciprocally related. At "low" pyrithione concentrations, transport inhibition plateaued at some finite value. This observation suggests that the fungi can detoxify low levels of the inhibitor. The concentration of pyrithione required for a given degree of growth inhibition increased as the experimental mycelial density increased. This phenomenon was consistent with the suggestion that the fungi are capable of inactivating pyrithione. | Mechanism of the antimicrobial action of pyrithione: effects on membrane transport, ATP levels, and protein synthesis. Pyrithione is a general inhibitor of membrane transport processes in fungi. A brief preincubation of Penicillium mycelia with pyrithione resulted in a marked decrease in the activities of a variety of independently regulated transport systems, including those for inorganic sulfate, inorganic phosphate, methylamine (actually, the NH(4) (+) permease), choline-O-sulfate, glucose, l-methionine (a specific system), and several hydrophobic l-alpha-amino acids (the general amino acid permease). The degree of inhibition at any fixed pyrithione concentration and exposure time increased as the pH of the incubation medium was decreased. This result strongly suggests that the active species is the un-ionized molecule and that pyrithione acts by collapsing a transmembrane DeltapH driving force. The degree of transport inhibition caused by a given concentration of pyrithione increased with increasing time of exposure to the inhibitor. However, exposure time and pyrithione concentration were not reciprocally related. At "low" pyrithione concentrations, transport inhibition plateaued at some finite value. This observation suggests that the fungi can detoxify low levels of the inhibitor. The concentration of pyrithione required for a given degree of growth inhibition increased as the experimental mycelial density increased. This phenomenon was consistent with the suggestion that the fungi are capable of inactivating pyrithione. | [
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PMID:28694 | Piperacillin: in vitro evaluation. | The in vitro activity of a new semisynthetic penicillin, piperacillin, was determined against 577 clinical isolates of gram-positive cocci and gram-negative bacilli. A concentration of 12.5 mug/ml inhibited 92% of isolates of Pseudomonas aeruginosa, 82% of Serratia marcescens, 73% of Escherichia coli, 61% of Klebsiella spp., and 42% of Enterobacter spp. Most Proteus spp. were extremely susceptible; over 85% were inhibited by 0.10 mug/ml. Piperacillin failed to inhibit the growth of gram-negative bacilli when large inocula were used. The type of media and pH had variable effects on the activity of piperacillin, depending upon the organism. Piperacillin was generally less active than PC-904 against gram-negative bacilli, but was consistently more active than carbenicillin and ticarcillin. | Piperacillin: in vitro evaluation. The in vitro activity of a new semisynthetic penicillin, piperacillin, was determined against 577 clinical isolates of gram-positive cocci and gram-negative bacilli. A concentration of 12.5 mug/ml inhibited 92% of isolates of Pseudomonas aeruginosa, 82% of Serratia marcescens, 73% of Escherichia coli, 61% of Klebsiella spp., and 42% of Enterobacter spp. Most Proteus spp. were extremely susceptible; over 85% were inhibited by 0.10 mug/ml. Piperacillin failed to inhibit the growth of gram-negative bacilli when large inocula were used. The type of media and pH had variable effects on the activity of piperacillin, depending upon the organism. Piperacillin was generally less active than PC-904 against gram-negative bacilli, but was consistently more active than carbenicillin and ticarcillin. | [
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PMID:28695 | Danger of bucolome in infants with hyperbilirubinaemia. Experimental evidence. | Effects of bucolome on congenitally jaundiced Gunn rats were examined. Plasma total bilirubin level fell immediately after a single injection of bucolome and the lowered level persisted for more than 6 hours. Plasma unbound-bilirubin level and cerebellar bilirubin content increased simultaneously with the drop in total plasma bilirubin level. Kernicterus was observed in the brains of the treated rats 6 hours after the treatment. LD50 of the drug in jaundiced rats was about 37 mg/kg, about one-tenth of the value in nonjaundiced rats. It is suggested that bucolome displaces bilirubin from albumin, transferring bilirubin from blood into tissues including the brain, and resulting in kernicterus. The use of bucolome in infants with hyperbilirubinaemia is inadvisable. | Danger of bucolome in infants with hyperbilirubinaemia. Experimental evidence. Effects of bucolome on congenitally jaundiced Gunn rats were examined. Plasma total bilirubin level fell immediately after a single injection of bucolome and the lowered level persisted for more than 6 hours. Plasma unbound-bilirubin level and cerebellar bilirubin content increased simultaneously with the drop in total plasma bilirubin level. Kernicterus was observed in the brains of the treated rats 6 hours after the treatment. LD50 of the drug in jaundiced rats was about 37 mg/kg, about one-tenth of the value in nonjaundiced rats. It is suggested that bucolome displaces bilirubin from albumin, transferring bilirubin from blood into tissues including the brain, and resulting in kernicterus. The use of bucolome in infants with hyperbilirubinaemia is inadvisable. | [
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PMID:28696 | [gamma-Glutamyl transpeptidase in human eccrine sweat (author's transl)]. | The concentration of gamma-glutamyl transpeptidase was determined in eccrine, thermal sweat of 56 healthy men (ages 20--60 years) and 48 healthy women (ages 17--55 years). Samples of sweat were collected from the chest and back. The concentrations of gamma-glutamyl transpeptidase showed great individual variations. The sex specific comparison of the concentrations of gamma-glutamyl transpeptidase revealed that the women excreted in the sweat from the chest and the back nearly the double amount of this enzyme. The gamma-glutamyl transpeptidase concentrations determined in the sweat from the chest of the examined men and women were three times higher as compared with those excreted simultaneous from the back of the same persons. In the group of the women was this differences statistically significant. | [gamma-Glutamyl transpeptidase in human eccrine sweat (author's transl)]. The concentration of gamma-glutamyl transpeptidase was determined in eccrine, thermal sweat of 56 healthy men (ages 20--60 years) and 48 healthy women (ages 17--55 years). Samples of sweat were collected from the chest and back. The concentrations of gamma-glutamyl transpeptidase showed great individual variations. The sex specific comparison of the concentrations of gamma-glutamyl transpeptidase revealed that the women excreted in the sweat from the chest and the back nearly the double amount of this enzyme. The gamma-glutamyl transpeptidase concentrations determined in the sweat from the chest of the examined men and women were three times higher as compared with those excreted simultaneous from the back of the same persons. In the group of the women was this differences statistically significant. | [
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PMID:28698 | Surgery for short esophagus with stricture: an experimental and clinical manometric study. | The surgical management of short esophagus with stricture has been simplified in recent years by the introduction of an esophageal lengthening procedure (Collis gastroplasty) combined with antireflux maneuvers, such as the Belsey and Nissen operations. This report compares the experimental and clinical manometric findings after these procedures. After myectomy of the lower esophageal sphincter (LES) in the cat, three experimental groups were developed including Collis gastroplasty, Collis-Belsey and Collis-Nissen. formation of a gastric tube did not provide protection against reflux while the Collis-Nissen procedure was more effective than the Collis-Belsey in raising pressures at the high pressure zone (HPZ) (26.0 +/- 3.5 cm H2O vs 15.0 +/- 2.7) and in preventing reflux (pH 6.3 +/- 0.5 vs 2.9 +/- 0.04). Of 20 patients with short esophagus and stricture, 11 underwent a Collis-Belsey procedure and nine a Collis-Nissen procedure. The latter procedure resulted in an HPZ of greater amplitude and length than the Collis-Belsey (18.7 +/- 2.3 mm Hg vs 11.6 +/- 1.7 and 3.9 +/- 0.4 cm vs 2.4 +/- 0.2). It also proved to be a more effective antireflux procedure, for no patient so treated had a positive pH reflux test after operation whereas after the Collis-Belsey procedure all but one patient had a positive pH reflux test. Short-term clinical results also support the superiority of the Collis-Nissen operation. | Surgery for short esophagus with stricture: an experimental and clinical manometric study. The surgical management of short esophagus with stricture has been simplified in recent years by the introduction of an esophageal lengthening procedure (Collis gastroplasty) combined with antireflux maneuvers, such as the Belsey and Nissen operations. This report compares the experimental and clinical manometric findings after these procedures. After myectomy of the lower esophageal sphincter (LES) in the cat, three experimental groups were developed including Collis gastroplasty, Collis-Belsey and Collis-Nissen. formation of a gastric tube did not provide protection against reflux while the Collis-Nissen procedure was more effective than the Collis-Belsey in raising pressures at the high pressure zone (HPZ) (26.0 +/- 3.5 cm H2O vs 15.0 +/- 2.7) and in preventing reflux (pH 6.3 +/- 0.5 vs 2.9 +/- 0.04). Of 20 patients with short esophagus and stricture, 11 underwent a Collis-Belsey procedure and nine a Collis-Nissen procedure. The latter procedure resulted in an HPZ of greater amplitude and length than the Collis-Belsey (18.7 +/- 2.3 mm Hg vs 11.6 +/- 1.7 and 3.9 +/- 0.4 cm vs 2.4 +/- 0.2). It also proved to be a more effective antireflux procedure, for no patient so treated had a positive pH reflux test after operation whereas after the Collis-Belsey procedure all but one patient had a positive pH reflux test. Short-term clinical results also support the superiority of the Collis-Nissen operation. | [
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PMID:28699 | The neuropharmacological actions of amoxapine. | Amoxapine possesses a broad spectrum of psychotropic actions, including antidepressant and neuroleptic effects in animals. Antidepressant activity is characterized by its ability to inhibit tetrabenazine-induced depression, antagonize reserpine-induced hypothermia and enhance yohimbine lethality. Neuroleptic activity is demonstrated by the ability of amoxapine to decrease locomotor activity, induce ptosis and catalepsy, inhibit apomorphine gnawing and amphetamine stereotyped behavior and by characteristic changes in monkey discriminated avoidance behavior. The fact that punished responding in squirrel monkeys was present was present after repeated administration may indicate an anti-anxiety action of this drug. Evidence is offered that the conversion of the tertiary terminal nitrogen to a secondary amine may alter the pharmacologica properties of dibenzoxazepines in a similar way to the for the phenothiazines. | The neuropharmacological actions of amoxapine. Amoxapine possesses a broad spectrum of psychotropic actions, including antidepressant and neuroleptic effects in animals. Antidepressant activity is characterized by its ability to inhibit tetrabenazine-induced depression, antagonize reserpine-induced hypothermia and enhance yohimbine lethality. Neuroleptic activity is demonstrated by the ability of amoxapine to decrease locomotor activity, induce ptosis and catalepsy, inhibit apomorphine gnawing and amphetamine stereotyped behavior and by characteristic changes in monkey discriminated avoidance behavior. The fact that punished responding in squirrel monkeys was present was present after repeated administration may indicate an anti-anxiety action of this drug. Evidence is offered that the conversion of the tertiary terminal nitrogen to a secondary amine may alter the pharmacologica properties of dibenzoxazepines in a similar way to the for the phenothiazines. | [
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PMID:28700 | Deoxycytidine: a morphine antagonist. | Deoxycytidine antagonizes the analgesic action of morphine in the rat, morphine-induced respiratory depression in the rabbit and mitigates withdrawal in the dependent mouse. Administration of deoxycytidine does not precipitate the abstinence syndrome in dependent mice, a property shared by certain other endogenous morphine antagonsits. Cytidine and thymidine closely related in structure to deoxycytidine, are interchangeable with saline as controls, indicating a high degree of specificity in the receptor involved in the "action-effects" sequence. The requirement for deoxycytidine in countering the effects of morphine parallels the requirement for certain other DNA pyrimidines in the antagonism of barbiturate and alcohol. The rapidity of antogonist action suggests that such a DNA species would presumably be localized in the synaptosome, at outer membrane or the synaptic junction. | Deoxycytidine: a morphine antagonist. Deoxycytidine antagonizes the analgesic action of morphine in the rat, morphine-induced respiratory depression in the rabbit and mitigates withdrawal in the dependent mouse. Administration of deoxycytidine does not precipitate the abstinence syndrome in dependent mice, a property shared by certain other endogenous morphine antagonsits. Cytidine and thymidine closely related in structure to deoxycytidine, are interchangeable with saline as controls, indicating a high degree of specificity in the receptor involved in the "action-effects" sequence. The requirement for deoxycytidine in countering the effects of morphine parallels the requirement for certain other DNA pyrimidines in the antagonism of barbiturate and alcohol. The rapidity of antogonist action suggests that such a DNA species would presumably be localized in the synaptosome, at outer membrane or the synaptic junction. | [
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PMID:28701 | The effect of chronic administration of digitoxin on the activity of the myocardial (Na + K)-ATPase in guinea-pigs. | When guinea-pigs were treated for 24 days with digitoxin 0.3 mg/kg s.c., the activity of the (Na + K)-ATPase of the heart muscle increased by about 30% compared to controls, whereas the enzymes prepared from kidney and brain showed no significant alteration in their activity. In animal species treated with digitoxin for 1 to 5 days, no increase of enzyme activity was observed. Only after 10 to 15 days of treatment, a significant increase of the (Na + K)-ATPase activity was noted which increased no further with treatment up to 24 days. There was no significant difference in the kinetic properties of the (Na + K)-ATPase prepared from digitoxin-treated animals compared to those from control animals; the KM-values for ATP remained unchanged, and there was the same dependence of the activity on the K+-concentration and the same sensitivity towards digitoxin. As there appears to be no significant change in the specific properties of the enzyme, the increase in activity may possibly be caused by an increase in the amount of enzyme as a result of an adaptive enzyme regulation. | The effect of chronic administration of digitoxin on the activity of the myocardial (Na + K)-ATPase in guinea-pigs. When guinea-pigs were treated for 24 days with digitoxin 0.3 mg/kg s.c., the activity of the (Na + K)-ATPase of the heart muscle increased by about 30% compared to controls, whereas the enzymes prepared from kidney and brain showed no significant alteration in their activity. In animal species treated with digitoxin for 1 to 5 days, no increase of enzyme activity was observed. Only after 10 to 15 days of treatment, a significant increase of the (Na + K)-ATPase activity was noted which increased no further with treatment up to 24 days. There was no significant difference in the kinetic properties of the (Na + K)-ATPase prepared from digitoxin-treated animals compared to those from control animals; the KM-values for ATP remained unchanged, and there was the same dependence of the activity on the K+-concentration and the same sensitivity towards digitoxin. As there appears to be no significant change in the specific properties of the enzyme, the increase in activity may possibly be caused by an increase in the amount of enzyme as a result of an adaptive enzyme regulation. | [
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PMID:28697 | [Research of the soluble microbial substances in organic fluids for the rapid diagnosis of some infections and particularly of bacterial meningitis (author's transl)]. | A number of immunological and non-immunological techniques have been recently used to detect soluble microbial substances in body fluids of patients with acute meningitis, bacteremia, and lobar pneumonia. By the immunological methods capsular highly polymerized polisaccharide group- or type-specific antigens of the most common C. N. S. pathogens (N. meningitidis A, B, and C; Str. pneumoniae, H. influenzae type b, E. coli K1, mucoid Pseudomonas, Cryptococcus neoformans) can be detected and quantitated in spinal fluids, sera, urine and other fluids specimens from meningitic patients. Capsular type-specific antigens from pneumococcus, and likely from H. influenzae as well, can be detected in sputum from patients with lower respiratory infection. Among the various techniques, the radioimmunoassay appears as the most sensitive one, but high diagnostic sensitivity can be also achieved by using the latex agglutination, haemoagglutination inhibition and coagglutination tests. Counterimmunoelectrophoresis, however, is still the far most used technique for determining soluble microbial antigens, albeit its sensitivity is significantly less than the one of the above mentioned methods. High specificity and some advantages in serotyping the causal organisms are probably the main reasons of such preferential employment. Among the non-immunological techniques the evaluation of lactate and lactic dehydrogenase has been used by some Author for differentiating between bacterial and non bacterial meningitis, and the limulus test for detecting Gram-negative bacterial endotoxins with a high degree of sensitivity and specificity. Finally, the liquid gas chromatography has been evaluated in detection of some organic products (microbial?), such as acids, amines, neutral compounds, in spinal fluid, allowing the differential diagnosis between bacterial, tuberculous, viral, and cryptococcal meningitis. In the present review sensitivity, specificity, and other properties of each test alone and in comparison with the conventional microbiological methods (Gram and culture) are evaluated and the biological and pathogenic role and significance of the soluble microbial antigens and endotoxin are discussed. | [Research of the soluble microbial substances in organic fluids for the rapid diagnosis of some infections and particularly of bacterial meningitis (author's transl)]. A number of immunological and non-immunological techniques have been recently used to detect soluble microbial substances in body fluids of patients with acute meningitis, bacteremia, and lobar pneumonia. By the immunological methods capsular highly polymerized polisaccharide group- or type-specific antigens of the most common C. N. S. pathogens (N. meningitidis A, B, and C; Str. pneumoniae, H. influenzae type b, E. coli K1, mucoid Pseudomonas, Cryptococcus neoformans) can be detected and quantitated in spinal fluids, sera, urine and other fluids specimens from meningitic patients. Capsular type-specific antigens from pneumococcus, and likely from H. influenzae as well, can be detected in sputum from patients with lower respiratory infection. Among the various techniques, the radioimmunoassay appears as the most sensitive one, but high diagnostic sensitivity can be also achieved by using the latex agglutination, haemoagglutination inhibition and coagglutination tests. Counterimmunoelectrophoresis, however, is still the far most used technique for determining soluble microbial antigens, albeit its sensitivity is significantly less than the one of the above mentioned methods. High specificity and some advantages in serotyping the causal organisms are probably the main reasons of such preferential employment. Among the non-immunological techniques the evaluation of lactate and lactic dehydrogenase has been used by some Author for differentiating between bacterial and non bacterial meningitis, and the limulus test for detecting Gram-negative bacterial endotoxins with a high degree of sensitivity and specificity. Finally, the liquid gas chromatography has been evaluated in detection of some organic products (microbial?), such as acids, amines, neutral compounds, in spinal fluid, allowing the differential diagnosis between bacterial, tuberculous, viral, and cryptococcal meningitis. In the present review sensitivity, specificity, and other properties of each test alone and in comparison with the conventional microbiological methods (Gram and culture) are evaluated and the biological and pathogenic role and significance of the soluble microbial antigens and endotoxin are discussed. | [
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PMID:28702 | A study of the mechanism of transport of benzylpenicillin in the rat submaxillary gland. | In vitro studies performed on slices of rat submaxillary gland to evaluate uptake and efflux of 14C-benzylpenicillin (10(-6)M, 10(-5)M) showed that uptake of 14C-benzylpenicillin was not significantly altered by aeration with N2, addition of 10(-5)M CN- or 10(-3) M probenecid, or substitution of K2SO4 in place of NaCl in the KRT buffer to produce a depolarizing solution. Lowering the extracellular pH (pHe) resulted in increases rates of uptake and efflux, whereas increasing the pHe resulted in decreased rates. The in vivo uptake of penicillin into whole glands excised from rates treated in vivo was very similar to that seen in the slice preparation. However, addition of probenecid to salivary gland slices in vitro decreased the rate of effux. These data suggest that the movement of penicillin in the rat salivary gland may occur by a two-step mechanism: (1) passive exchange of penicillin into the gland dependent on the degree of dissociation of penicillin, and (2) active excretion of the drug from the gland by a transport mechanism similar to that of the kidney densitive to probenecid. | A study of the mechanism of transport of benzylpenicillin in the rat submaxillary gland. In vitro studies performed on slices of rat submaxillary gland to evaluate uptake and efflux of 14C-benzylpenicillin (10(-6)M, 10(-5)M) showed that uptake of 14C-benzylpenicillin was not significantly altered by aeration with N2, addition of 10(-5)M CN- or 10(-3) M probenecid, or substitution of K2SO4 in place of NaCl in the KRT buffer to produce a depolarizing solution. Lowering the extracellular pH (pHe) resulted in increases rates of uptake and efflux, whereas increasing the pHe resulted in decreased rates. The in vivo uptake of penicillin into whole glands excised from rates treated in vivo was very similar to that seen in the slice preparation. However, addition of probenecid to salivary gland slices in vitro decreased the rate of effux. These data suggest that the movement of penicillin in the rat salivary gland may occur by a two-step mechanism: (1) passive exchange of penicillin into the gland dependent on the degree of dissociation of penicillin, and (2) active excretion of the drug from the gland by a transport mechanism similar to that of the kidney densitive to probenecid. | [
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PMID:28703 | Adrenergic contribution to the motor transmission in the dog vas deferens. | Isolated vas deferens preparations from 9 dogs were subjected to electrical stimulation and chemical excitation under physiological conditions. The experimental smooth muscle cylinders were confined to the terminal 3 cm portions of either the distal 'urethral' segment or the proximal 'epididymal' segment. Intermittent field stimulation, at 60 sec intervals, was provided by a stimulator of low output impedance under constant parameters of frequency and voltage and an occasionally varied pulse width. Results from this examination completely confirmed the following: (i) a high degree of contractile sensitivity to minute doses of noradrenaline (0.03--0.03 micron; 10(-8)-10(-7) g/ml) and tyramine 0.58 micron (10(-7) g/ml; (ii) an apparent ease and rapidity of extinguishing the electrically-induced twitches by either small doses of phentolamine 0.25 micron (10(-7) g/ml) or phenoxybenzamine 5.8 micron (2 x 10(-6) g/ml); (iii) a complete absence of any inhibitory action by tyramine or noradrenaline on the electrically-induced twitches. The behavior of this motor transmission of the longitudinal muscle of the vas deferens to classical alpha-adrenoceptor blocking agents and the intense susceptibility to the motor actions of the putative neurotransmitter clearly fit in with a picture of an adrenergic implication in this mode of transmission. | Adrenergic contribution to the motor transmission in the dog vas deferens. Isolated vas deferens preparations from 9 dogs were subjected to electrical stimulation and chemical excitation under physiological conditions. The experimental smooth muscle cylinders were confined to the terminal 3 cm portions of either the distal 'urethral' segment or the proximal 'epididymal' segment. Intermittent field stimulation, at 60 sec intervals, was provided by a stimulator of low output impedance under constant parameters of frequency and voltage and an occasionally varied pulse width. Results from this examination completely confirmed the following: (i) a high degree of contractile sensitivity to minute doses of noradrenaline (0.03--0.03 micron; 10(-8)-10(-7) g/ml) and tyramine 0.58 micron (10(-7) g/ml; (ii) an apparent ease and rapidity of extinguishing the electrically-induced twitches by either small doses of phentolamine 0.25 micron (10(-7) g/ml) or phenoxybenzamine 5.8 micron (2 x 10(-6) g/ml); (iii) a complete absence of any inhibitory action by tyramine or noradrenaline on the electrically-induced twitches. The behavior of this motor transmission of the longitudinal muscle of the vas deferens to classical alpha-adrenoceptor blocking agents and the intense susceptibility to the motor actions of the putative neurotransmitter clearly fit in with a picture of an adrenergic implication in this mode of transmission. | [
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PMID:28704 | In vitro measurement of the beta-adrenergic blocking properties of ORF 12592, the 5-hydroxy analog of propranolol. | ORF 12592 caused concentration-dependent inhibition of isoproterenol stimulated adenylate cyclase activity in sarcolemma-enriched membrane preparations of guinea-pig myocardium. Its potency was slightly less than that of d,l-propranolol. ORF 12592 did not stimulate basal enzyme activity, suggesting it to be devoid of intrinsic sympathomimetic activity. It produced no marked inhibition of basal activity, nor did it inhibit sodium fluoride stimulated enzyme activity, indicating that the compound acts at the receptor rather than the catalytic site of the beta-adrenergic receptor-adenylate cyclase complex. ORF 12592 competed for binding of 3H-dihydroalprenolol to specific beta1 and beta2-adrenergic binding sites on turkey and leopard frog erythrocyte membranes respectively. Concentration-binding inhibition curves indicated that ORF 12592 is a non-selective beta-blocker with slightly less affinity for each beta-adrenergic receptor than propranolol. | In vitro measurement of the beta-adrenergic blocking properties of ORF 12592, the 5-hydroxy analog of propranolol. ORF 12592 caused concentration-dependent inhibition of isoproterenol stimulated adenylate cyclase activity in sarcolemma-enriched membrane preparations of guinea-pig myocardium. Its potency was slightly less than that of d,l-propranolol. ORF 12592 did not stimulate basal enzyme activity, suggesting it to be devoid of intrinsic sympathomimetic activity. It produced no marked inhibition of basal activity, nor did it inhibit sodium fluoride stimulated enzyme activity, indicating that the compound acts at the receptor rather than the catalytic site of the beta-adrenergic receptor-adenylate cyclase complex. ORF 12592 competed for binding of 3H-dihydroalprenolol to specific beta1 and beta2-adrenergic binding sites on turkey and leopard frog erythrocyte membranes respectively. Concentration-binding inhibition curves indicated that ORF 12592 is a non-selective beta-blocker with slightly less affinity for each beta-adrenergic receptor than propranolol. | [
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PMID:28705 | Bacteriologic flora of aspiration-induced pulmonary infections. | The role of anaerobic and aerobic microorganisms in the genesis of pneumonia or lung abscess in patients with historical, clinical, and radiologic findings suggestive of aspiration was compared to their role in similar patients without these findings. Bacterial specimens were obtained by transtracheal aspiration or thoracentesis. Anaerobes were isolated in 100% of the patients who were aspiration-prone as contrasted with only 20% of those who were not. Isolation of a single species or no growth was more common in the nonaspiration group, whereas multiple isolates were more common in the aspiration group. Patients with lung abscesses were treated with penicillin and all of them responded clinically, despite occasional recovery from the culture specimen of penicillin-resistant organisms. This suggests that lung abscess may be the result of a synergistic bacterial infection. | Bacteriologic flora of aspiration-induced pulmonary infections. The role of anaerobic and aerobic microorganisms in the genesis of pneumonia or lung abscess in patients with historical, clinical, and radiologic findings suggestive of aspiration was compared to their role in similar patients without these findings. Bacterial specimens were obtained by transtracheal aspiration or thoracentesis. Anaerobes were isolated in 100% of the patients who were aspiration-prone as contrasted with only 20% of those who were not. Isolation of a single species or no growth was more common in the nonaspiration group, whereas multiple isolates were more common in the aspiration group. Patients with lung abscesses were treated with penicillin and all of them responded clinically, despite occasional recovery from the culture specimen of penicillin-resistant organisms. This suggests that lung abscess may be the result of a synergistic bacterial infection. | [
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PMID:28706 | Physician extenders in walk-in clinics: a prospective evaluation of the AMOSIST program. | The Automated Military Outpatient System (AMOS) Project was developed to improve the ambulatory care of patients with episodic and chronic illnesses. During the development of its episodic care component, the relative frequency of problems treated by the walk-in clinic staff was analyzed and showed a high volume of acute minor illnesses. A simple, conservative triage system run by non-professionals was developed to screen patients to a clinic for benign, self-limited illnesses run by physician-extenders. This group, the equivalent of civilian licensed practical nurses and nurses' aides, was trained in a task-oriented fashion to treat 44 common minor illnesses. Clinical algorithms for these illnesses were developed and used as training tools, memory aids, and auditing instruments. This program is now operating in 26 US Army hospitals and caring for some 44,000 patients a month in the continetal United States. We report the results of a prospective audit of the corpsmen and a study of the patient attitude and acceptance of the program. | Physician extenders in walk-in clinics: a prospective evaluation of the AMOSIST program. The Automated Military Outpatient System (AMOS) Project was developed to improve the ambulatory care of patients with episodic and chronic illnesses. During the development of its episodic care component, the relative frequency of problems treated by the walk-in clinic staff was analyzed and showed a high volume of acute minor illnesses. A simple, conservative triage system run by non-professionals was developed to screen patients to a clinic for benign, self-limited illnesses run by physician-extenders. This group, the equivalent of civilian licensed practical nurses and nurses' aides, was trained in a task-oriented fashion to treat 44 common minor illnesses. Clinical algorithms for these illnesses were developed and used as training tools, memory aids, and auditing instruments. This program is now operating in 26 US Army hospitals and caring for some 44,000 patients a month in the continetal United States. We report the results of a prospective audit of the corpsmen and a study of the patient attitude and acceptance of the program. | [
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PMID:28707 | The glucose-pH relationship in parapneumonic effusions. | Both a low pleural fluid glucose concentration and pleural fluid acidosis are markers of severe pleural inflammation, but the relationship between these phenomena has not been defined clearly. Therefore, we measured simultaneous pleural fluid glucose concentrations and pH in 25 consecutive parapneumonic pleural fluids. Seventeen effusions had a glucose concentration greater than 60 mg/dl (group 1, 126 +/- 7 mg/dl, mean +/- SEM), while eight had a pleural fluid glucose less than 60 mg/dl (group 2, 15 +/- 3 mg/dl, P less than .01). Pleural fluid pH was 7.35 +/- 0.03 in group 1 compared with 6.83 +/- 0.09 in group 2 (P less than .01). A significant correlation between pleural fluid glucose and pH was found (r = .81, P less than .01). Low-glucose, low-pH effusions were complicated (either loculated or empyemas). Uncomplicated effusions had glucose concentrations greater than 60 mg/dl and a pleural fluid pH greater than 7.30. The concomitant occurrence of low pleural fluid glucose and pH suggests that the mechanisms leading to these phenomena are interrelated. | The glucose-pH relationship in parapneumonic effusions. Both a low pleural fluid glucose concentration and pleural fluid acidosis are markers of severe pleural inflammation, but the relationship between these phenomena has not been defined clearly. Therefore, we measured simultaneous pleural fluid glucose concentrations and pH in 25 consecutive parapneumonic pleural fluids. Seventeen effusions had a glucose concentration greater than 60 mg/dl (group 1, 126 +/- 7 mg/dl, mean +/- SEM), while eight had a pleural fluid glucose less than 60 mg/dl (group 2, 15 +/- 3 mg/dl, P less than .01). Pleural fluid pH was 7.35 +/- 0.03 in group 1 compared with 6.83 +/- 0.09 in group 2 (P less than .01). A significant correlation between pleural fluid glucose and pH was found (r = .81, P less than .01). Low-glucose, low-pH effusions were complicated (either loculated or empyemas). Uncomplicated effusions had glucose concentrations greater than 60 mg/dl and a pleural fluid pH greater than 7.30. The concomitant occurrence of low pleural fluid glucose and pH suggests that the mechanisms leading to these phenomena are interrelated. | [
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PMID:28708 | Hyperparathyroidism, chemodectoma, thymoma, and myasthenia gravis. | Of two patients with hyperparathyroidism, one had an associated chemodectoma, and the other had a thymoma and myasthenia gravis. There is a possible relationship to the multiple endocrine neoplasia syndromes. | Hyperparathyroidism, chemodectoma, thymoma, and myasthenia gravis. Of two patients with hyperparathyroidism, one had an associated chemodectoma, and the other had a thymoma and myasthenia gravis. There is a possible relationship to the multiple endocrine neoplasia syndromes. | [
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PMID:28709 | [The atrial arrhythmia syndrome of vagal origin]. | Having observed 18 cases, the authors describe a syndrome of recurrent paroxysmal atrial arrhythmia which was very homogeneous from the clinical and ECG point of view. It was usually found in middle aged males, with no demonstrable underlying heart disease, whose disorder of intra-atrial conduction occurred during sinus rhythm. The condition developed slowly over the course of years towards a maximum incidence of several short daily attacks of an arrhythmia which alternated between an atrial fibrillation and atrial flutter. Vagal overactivity is the precipitating cause of these attacks which are usually not completely nocturnal. The condition never progressed to sino-atrial block nor to permanent fibrillation. The beginning of each attack, often heralded by atrial coupling with a long enough interval to cause re-entry, is accompanied by slowing of the sinus rate down to the threshold level. The vagal effect of shortening the action potential and refractory period is recognised to be non-homogeneous in the atrial wall, and suggests a re-entry mechanism rather than hyper-excitability. This would explain the usual resistance of atrial arrhythmias of vagal origin to digitalis, beta blockers and quinidine. Amiodarone alone is usually effective because of the prolongation of the action potential which it causes. In 5 particularly resistant cases a good clinical result was obtained by the insertion of an atrial pacemaker with a fairly rapid rate. | [The atrial arrhythmia syndrome of vagal origin]. Having observed 18 cases, the authors describe a syndrome of recurrent paroxysmal atrial arrhythmia which was very homogeneous from the clinical and ECG point of view. It was usually found in middle aged males, with no demonstrable underlying heart disease, whose disorder of intra-atrial conduction occurred during sinus rhythm. The condition developed slowly over the course of years towards a maximum incidence of several short daily attacks of an arrhythmia which alternated between an atrial fibrillation and atrial flutter. Vagal overactivity is the precipitating cause of these attacks which are usually not completely nocturnal. The condition never progressed to sino-atrial block nor to permanent fibrillation. The beginning of each attack, often heralded by atrial coupling with a long enough interval to cause re-entry, is accompanied by slowing of the sinus rate down to the threshold level. The vagal effect of shortening the action potential and refractory period is recognised to be non-homogeneous in the atrial wall, and suggests a re-entry mechanism rather than hyper-excitability. This would explain the usual resistance of atrial arrhythmias of vagal origin to digitalis, beta blockers and quinidine. Amiodarone alone is usually effective because of the prolongation of the action potential which it causes. In 5 particularly resistant cases a good clinical result was obtained by the insertion of an atrial pacemaker with a fairly rapid rate. | [
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PMID:28710 | [Comparative study of acute poisonings in Belgian children and immigrant workers children]. | This survey covers 786 children admitted with acute poisoning to the Saint-Pierre Hospital in Brussels between 1967 and 1976. The type and the frequency of products responsible for poisoning in the indigenous and immigrant children are compared. 45% of children admitted to hospital are immigrants but they constitute only 29% of the children admitted with poisoning. When compared with Belgian children, the immigrants more commonly ingest household products and ordinary drugs are taken more often than prescribed ones, but minor tranquillisers are particularly common. The socio-economic and psychologic factors responsible for these accidents are discussed and methods of prevention are suggested. | [Comparative study of acute poisonings in Belgian children and immigrant workers children]. This survey covers 786 children admitted with acute poisoning to the Saint-Pierre Hospital in Brussels between 1967 and 1976. The type and the frequency of products responsible for poisoning in the indigenous and immigrant children are compared. 45% of children admitted to hospital are immigrants but they constitute only 29% of the children admitted with poisoning. When compared with Belgian children, the immigrants more commonly ingest household products and ordinary drugs are taken more often than prescribed ones, but minor tranquillisers are particularly common. The socio-economic and psychologic factors responsible for these accidents are discussed and methods of prevention are suggested. | [
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PMID:28711 | "Akinetic depression" in schizophrenia. | It is possible that some "postpsychotic depressions" may be a toxic effect of antipsychotic drugs. Out of a total of 94 schizophrenic patients, 28 developed a mild akinesia and 32 never developed extrapyramidal symptoms. Those who developed akinesia became less psychotic, but they also experienced a significant, although modest, increase in depression ratings. Successful treatment of the akinesia resulted in significant improvements in depression, somatic concern, anxiety, emotional withdrawal, blunted affect, and motor retardation on both physicians' and nurses' ratings. A high association between akinesia and both objectively rated and subjectively experienced sedative effect indicates that an 'akinetic depression' is not likely if the patient does not look or feel drowsy. The 32 nonakinetic patients also became less psychotic, but not more depressed. | "Akinetic depression" in schizophrenia. It is possible that some "postpsychotic depressions" may be a toxic effect of antipsychotic drugs. Out of a total of 94 schizophrenic patients, 28 developed a mild akinesia and 32 never developed extrapyramidal symptoms. Those who developed akinesia became less psychotic, but they also experienced a significant, although modest, increase in depression ratings. Successful treatment of the akinesia resulted in significant improvements in depression, somatic concern, anxiety, emotional withdrawal, blunted affect, and motor retardation on both physicians' and nurses' ratings. A high association between akinesia and both objectively rated and subjectively experienced sedative effect indicates that an 'akinetic depression' is not likely if the patient does not look or feel drowsy. The 32 nonakinetic patients also became less psychotic, but not more depressed. | [
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PMID:28716 | [Barbexaclone in the treatment of cerebral dysrhythmia]. | Forty two patients (22 adults and 20 children or adolescents) with cerebral dysrithmia were included in a therapeutic trial using barbexaclone: 28 patients suffered from grand mal crises, 2 had associated GM and petit mal and 12 showed disturbances of behaviour without clinical crises. The patients were observed from 6 to 13 months. Four patients failed to complete the trial due to various side effects; 25 patients with GM and 11 with behaviour disturbances showed a very good response; two patients with associated petit mal failed to show any improvement. Side effects such as insomnia and irritability were seen in 8 patients. The authors concluded that barbexaclone is an excellent therapeutic agent in the treatment of grand mal and in patients with behaviour disturbances without convulsive crises. | [Barbexaclone in the treatment of cerebral dysrhythmia]. Forty two patients (22 adults and 20 children or adolescents) with cerebral dysrithmia were included in a therapeutic trial using barbexaclone: 28 patients suffered from grand mal crises, 2 had associated GM and petit mal and 12 showed disturbances of behaviour without clinical crises. The patients were observed from 6 to 13 months. Four patients failed to complete the trial due to various side effects; 25 patients with GM and 11 with behaviour disturbances showed a very good response; two patients with associated petit mal failed to show any improvement. Side effects such as insomnia and irritability were seen in 8 patients. The authors concluded that barbexaclone is an excellent therapeutic agent in the treatment of grand mal and in patients with behaviour disturbances without convulsive crises. | [
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PMID:28713 | [The in-vivo effect of dihydroergocristine on human platelet function]. | An acute test was run on healthy volunteers to assess the effect of i.v. dihydroergocristine methansulphonate on platelet function. The number of platelets was virtually unaffected, whereas adhesion to glass was significantly reduced. A direct and specific effect was noted on the 1st, adrenaline aggregation wave, while the 2nd wave (expression of ADP) induced aggregation did not appear to have been significantly altered. It is felt that further examination of the alpha-adrenergic block induced by the drug should be under-taken in view of the recent literature data which explain the inability of commonly employed anti-aggreganting drugs, such as acetylsalicylic acid, to prevent and treat atherothrombosis, in spite of the encouraging experimental results. | [The in-vivo effect of dihydroergocristine on human platelet function]. An acute test was run on healthy volunteers to assess the effect of i.v. dihydroergocristine methansulphonate on platelet function. The number of platelets was virtually unaffected, whereas adhesion to glass was significantly reduced. A direct and specific effect was noted on the 1st, adrenaline aggregation wave, while the 2nd wave (expression of ADP) induced aggregation did not appear to have been significantly altered. It is felt that further examination of the alpha-adrenergic block induced by the drug should be under-taken in view of the recent literature data which explain the inability of commonly employed anti-aggreganting drugs, such as acetylsalicylic acid, to prevent and treat atherothrombosis, in spite of the encouraging experimental results. | [
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PMID:28721 | Corrosive injury of the esophagus. Result of ingesting some denture cleanser tablets and powder. | Denture cleansers are ubiquitous compounds frequently found in the household. Experimental studies were carried out to investigate the caustic, chemical, and histopathological properties of Polident and Efferdent tablets and Ansodent powder. All products were found to have caused severe focal to diffuse caustic burns of the esophagus due to the concentration of hydrogen peroxide that was liberated by these compounds. | Corrosive injury of the esophagus. Result of ingesting some denture cleanser tablets and powder. Denture cleansers are ubiquitous compounds frequently found in the household. Experimental studies were carried out to investigate the caustic, chemical, and histopathological properties of Polident and Efferdent tablets and Ansodent powder. All products were found to have caused severe focal to diffuse caustic burns of the esophagus due to the concentration of hydrogen peroxide that was liberated by these compounds. | [
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PMID:28723 | Effects of xylazine hydrochloride on urine in cattle. | Urine volume, urine pH, and urine glucose concentration were monitored for up to 24 hours after physiological saline or one of two dosage levels (0.22 mg/kg or 0.44 mg/kg) of xylazine was administered to cows. During the first 2 hours after xylazine was given, urine output was greatly increased (relative to the control animals), with the high dosage group having more output than the low dosage group. The influence of the drug on urine volume had ended by 5 hours after injection when urine output in both dosage groups had returned to that of the control group. Glucose was detected in the urine of xylazine treated animals, beginning at 15 to 30 minutes after injection, reached a maximum at 2 hours, and was undetectable at 5 to 6 hours. Urine pH decreased in control and treated animals, but in treated animals the pH began to increase 2 hr after treatment. | Effects of xylazine hydrochloride on urine in cattle. Urine volume, urine pH, and urine glucose concentration were monitored for up to 24 hours after physiological saline or one of two dosage levels (0.22 mg/kg or 0.44 mg/kg) of xylazine was administered to cows. During the first 2 hours after xylazine was given, urine output was greatly increased (relative to the control animals), with the high dosage group having more output than the low dosage group. The influence of the drug on urine volume had ended by 5 hours after injection when urine output in both dosage groups had returned to that of the control group. Glucose was detected in the urine of xylazine treated animals, beginning at 15 to 30 minutes after injection, reached a maximum at 2 hours, and was undetectable at 5 to 6 hours. Urine pH decreased in control and treated animals, but in treated animals the pH began to increase 2 hr after treatment. | [
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PMID:28725 | A characterization of the nucleotide uptake of chromaffin granules of bovine adrenal medulla. | Chromaffin granules isolated from bovine adrenal gland were incubated with (3)H-labelled nucleotides and [(14)C]noradrenaline to study the uptake of these substances. [(3)H]ATP, [(3)H]ADP and [(3)H]AMP are taken up by these organelles by the same temperature-dependent mechanism. The apparent K(m) for ATP and ADP is 1.4mm, and for AMP it is 2.9mm. The uptake of ATP has a flat pH optimum, whereas the catecholamine uptake increases with more alkaline pH. Atractyloside and carboxyatractyloside are competitive and specific inhibitors of nucleotide uptake, whereas reserpine inhibits only that for catecholamines. Mg(2+) ions activate uptake of both catecholamine and nucleotides, whereas EDTA and N-ethylmaleimide inhibit these processes. Nucleotide and catecholamine uptakes are inhibited by uncouplers of oxidative phosphorylation and by two ATP analogues. NH(4) (+) ions and nigericin in the presence of KCl inhibit only catecholamine uptake. It is concluded that nucleotide uptake, as proposed previously for catecholamine uptake, depends on an electrochemical proton gradient produced by a proton-translocating adenosine triphosphatase localized in the membrane of chromaffin granules. Furthermore, as suggested by the effect of NH(4) (+) and nigericin, catecholamine uptake apparently depends on the chemical part of this gradient, whereas the results for nucleotide uptake are consistent with its dependence on the electrical component. | A characterization of the nucleotide uptake of chromaffin granules of bovine adrenal medulla. Chromaffin granules isolated from bovine adrenal gland were incubated with (3)H-labelled nucleotides and [(14)C]noradrenaline to study the uptake of these substances. [(3)H]ATP, [(3)H]ADP and [(3)H]AMP are taken up by these organelles by the same temperature-dependent mechanism. The apparent K(m) for ATP and ADP is 1.4mm, and for AMP it is 2.9mm. The uptake of ATP has a flat pH optimum, whereas the catecholamine uptake increases with more alkaline pH. Atractyloside and carboxyatractyloside are competitive and specific inhibitors of nucleotide uptake, whereas reserpine inhibits only that for catecholamines. Mg(2+) ions activate uptake of both catecholamine and nucleotides, whereas EDTA and N-ethylmaleimide inhibit these processes. Nucleotide and catecholamine uptakes are inhibited by uncouplers of oxidative phosphorylation and by two ATP analogues. NH(4) (+) ions and nigericin in the presence of KCl inhibit only catecholamine uptake. It is concluded that nucleotide uptake, as proposed previously for catecholamine uptake, depends on an electrochemical proton gradient produced by a proton-translocating adenosine triphosphatase localized in the membrane of chromaffin granules. Furthermore, as suggested by the effect of NH(4) (+) and nigericin, catecholamine uptake apparently depends on the chemical part of this gradient, whereas the results for nucleotide uptake are consistent with its dependence on the electrical component. | [
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PMID:28726 | Pyruvate and ketone-body transport across the mitochondrial membrane. Exchange properties, pH-dependence and mechanism of the carrier. | The effects of exchangeable ions and pH on the efflux of pyruvate from preloaded mitochondria are reported. Efflux obeys first-order kinetics, and the stimulation of efflux by exchangeable ions such as acetoacetate and lactate obeys Michaelis--Menten kinetics. The apparent Km value +/- S.E. for acetoacetate was 0.56 +/- 0.14 mM (n = 5) and that for lactate 12.3 +/- 2.3 mM (n = 6). The Vmax. values +/- S.E. at 0 degrees C were 16.2 +/- 2.0 and 21.9 +/- 2.7 nmol/min per mg of protein. The exchange of a variety of other substituted monocarboxylates was also studied. Efflux was also stimulated by increasing the external pH. The data gave a pK for the transport process of 8.35 and a Vmax. of 3.31 +/- 0.14 nmol/min per mg. The similarity of the Vmax. values for various exchangeable ions but the difference of this from the Vmax. in the absence of exchangeable ions may indicate that transport of pyruvate occurs with H+ and not in exchange for an OH- ion. The inhibition of transport by alpha-cyano-4-hydroxycinnamate took several seconds to reach completion at 0 degrees C. It is proposed that inhibition occurs by binding to the substrate site and subsequent reaction with an -SH group on the inside of the membrane. The inhibitor can be displaced by substrates that can also enter the mitochondria independently of the carrier and so compete with the inhibitor for the substrate-binding site on the inside of the membrane. A mechanism for transport is proposed that invokes a transition state of pyruvate involving addition of an -SH group to the 2-carbon of pyruvate. Evidence is presented that suggests that ketone bodies may cross the mitochondrial membrane either on the carrier or by free diffusion. The physiological involvement of the carrier in ketone-body metabolism is discussed. The role of ketone bodies and pH in the physiological regulation of pyruvate transport is considered. | Pyruvate and ketone-body transport across the mitochondrial membrane. Exchange properties, pH-dependence and mechanism of the carrier. The effects of exchangeable ions and pH on the efflux of pyruvate from preloaded mitochondria are reported. Efflux obeys first-order kinetics, and the stimulation of efflux by exchangeable ions such as acetoacetate and lactate obeys Michaelis--Menten kinetics. The apparent Km value +/- S.E. for acetoacetate was 0.56 +/- 0.14 mM (n = 5) and that for lactate 12.3 +/- 2.3 mM (n = 6). The Vmax. values +/- S.E. at 0 degrees C were 16.2 +/- 2.0 and 21.9 +/- 2.7 nmol/min per mg of protein. The exchange of a variety of other substituted monocarboxylates was also studied. Efflux was also stimulated by increasing the external pH. The data gave a pK for the transport process of 8.35 and a Vmax. of 3.31 +/- 0.14 nmol/min per mg. The similarity of the Vmax. values for various exchangeable ions but the difference of this from the Vmax. in the absence of exchangeable ions may indicate that transport of pyruvate occurs with H+ and not in exchange for an OH- ion. The inhibition of transport by alpha-cyano-4-hydroxycinnamate took several seconds to reach completion at 0 degrees C. It is proposed that inhibition occurs by binding to the substrate site and subsequent reaction with an -SH group on the inside of the membrane. The inhibitor can be displaced by substrates that can also enter the mitochondria independently of the carrier and so compete with the inhibitor for the substrate-binding site on the inside of the membrane. A mechanism for transport is proposed that invokes a transition state of pyruvate involving addition of an -SH group to the 2-carbon of pyruvate. Evidence is presented that suggests that ketone bodies may cross the mitochondrial membrane either on the carrier or by free diffusion. The physiological involvement of the carrier in ketone-body metabolism is discussed. The role of ketone bodies and pH in the physiological regulation of pyruvate transport is considered. | [
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PMID:28727 | Stimulation of pyruvate transport in metabolizing mitochondria through changes in the transmembrane pH gradient induced by glucagon treatment of rats. | Glucagon treatment of rats allowed the isolation of liver mitochondria with enhanced rates of pyruvate metabolism measured in either sucrose or KCl media. No change in the activity of the pyruvate carrier itself was apparent, but under metabolizing conditions, use of the inhibitor of pyruvate transport, alpha-cyano-4-hydroxycinnamate, demonstrated that pyruvate transport limited the rate of pyruvate metabolism. The maximum rate of transport under metabolizing conditions was enhanced by glucagon treatment. Problems involved in measuring the transmembrane pH gradient under metabolizing conditions are discussed and a variety of techniques are used to estimate the matrix pH. From the distribution of methylamine, ammonia and D-lactate and the Ki for inhibition by alpha-cyano-4-hydroxycinnamate it is concluded that the matrix is more acid than the medium and that the pH of the matrix rises after glucagon treatment. The increase in matrix pH stimulates pyruvate transport. The membrane potential, ATP concentration and O2 uptake were also increased under metabolizing conditions in glucagon-treated mitochondria. These changes were correlated with a stimulation of the respiratory chain which can be observed in uncoupled mitochondria [Yamazaki (1975) J. Biol. Chem. 250, 7924--7930]. The mitochondrial Mg2+ content (mean +/- S.E.M.) was increased from 38.8 +/- 1.2 (n = 26) to 47.5 +/- 2.0 (n = 26) ng-atoms/mg by glucagon and the K+ content from 126.7 +/- 10.3 (n = 19) ng-atoms/mg. This may represent a change in membrane potential induced by glucagon in vivo. The physiological significance of these results in the control of gluconeogenesis is discussed. | Stimulation of pyruvate transport in metabolizing mitochondria through changes in the transmembrane pH gradient induced by glucagon treatment of rats. Glucagon treatment of rats allowed the isolation of liver mitochondria with enhanced rates of pyruvate metabolism measured in either sucrose or KCl media. No change in the activity of the pyruvate carrier itself was apparent, but under metabolizing conditions, use of the inhibitor of pyruvate transport, alpha-cyano-4-hydroxycinnamate, demonstrated that pyruvate transport limited the rate of pyruvate metabolism. The maximum rate of transport under metabolizing conditions was enhanced by glucagon treatment. Problems involved in measuring the transmembrane pH gradient under metabolizing conditions are discussed and a variety of techniques are used to estimate the matrix pH. From the distribution of methylamine, ammonia and D-lactate and the Ki for inhibition by alpha-cyano-4-hydroxycinnamate it is concluded that the matrix is more acid than the medium and that the pH of the matrix rises after glucagon treatment. The increase in matrix pH stimulates pyruvate transport. The membrane potential, ATP concentration and O2 uptake were also increased under metabolizing conditions in glucagon-treated mitochondria. These changes were correlated with a stimulation of the respiratory chain which can be observed in uncoupled mitochondria [Yamazaki (1975) J. Biol. Chem. 250, 7924--7930]. The mitochondrial Mg2+ content (mean +/- S.E.M.) was increased from 38.8 +/- 1.2 (n = 26) to 47.5 +/- 2.0 (n = 26) ng-atoms/mg by glucagon and the K+ content from 126.7 +/- 10.3 (n = 19) ng-atoms/mg. This may represent a change in membrane potential induced by glucagon in vivo. The physiological significance of these results in the control of gluconeogenesis is discussed. | [
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PMID:28728 | Kinetics of liver microsomal cholecalciferol 25-hydroxylase in vitamin D-depleted and -repleated rats. | Kinetics of vitamin D-depleted and -repleted rat liver microsomal cholecalciferol 25-hydroxylase were studied. Anaerobiosis, CO, omission of a NADPH-generating system and addition of detergents all decreased the activities, showing that the hydroxylase behaves like a cytochrome P-450-dependent enzyme. An apparent Km of 0.18 micrometer and Vmax. of 32pmol/min per g of tissue were found for vitamin D-deficient animals. Although both apparent Km and Vmax. were significantly altered in vitamin D-repleted animals no inhibition of the enzyme was elicited. These latter results show that at normal vitamin D intake, rat liver cholecalciferol 25-hydroxylase is not feedback-inhibited. | Kinetics of liver microsomal cholecalciferol 25-hydroxylase in vitamin D-depleted and -repleated rats. Kinetics of vitamin D-depleted and -repleted rat liver microsomal cholecalciferol 25-hydroxylase were studied. Anaerobiosis, CO, omission of a NADPH-generating system and addition of detergents all decreased the activities, showing that the hydroxylase behaves like a cytochrome P-450-dependent enzyme. An apparent Km of 0.18 micrometer and Vmax. of 32pmol/min per g of tissue were found for vitamin D-deficient animals. Although both apparent Km and Vmax. were significantly altered in vitamin D-repleted animals no inhibition of the enzyme was elicited. These latter results show that at normal vitamin D intake, rat liver cholecalciferol 25-hydroxylase is not feedback-inhibited. | [
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PMID:28729 | The uptake of silicic acid by rat liver mitochondria. | 1. To gain insight into a putative role for mitochondria in silicon metabolism, mitochondrial uptake (by which it is meant the removal from the medium) of silicic acid [Si(OH)4] was studied under conditions minimizing SI(OH)4 polymerization. 2. Measurements of mitochondrial respiration and swelling indicated indirectly a significant uptake of Si(OH)4 as a weak acid, but this was not confirmed when 31Si(OH)4 was used as a tracer. 31Si(OH)4 occupied a mitochondrial volume similar to that of 3H2O and was relatively unaffected by mitochondrial energy status and by the pH gradient across the mitochondrial inner membrane. 3. Uptake was directly proportional to Si(OH)4 concentration in the range 0-3 mM. 4. The uptake consisted of two components: under all conditions examined, the greater quantity, amounting to 1-2nmol of Si(OH)4/mg of mitochondrial protein, was bound, a major portion of it external to the inner membrane, with the lesser quantity free within the matrix space. 5. Equilibration of 31Si(OH)4 between medium and matrix was a slow process, having a half-time of approx. 10 min at 22 degrees C. 6. Mersalyl and N-ethylmaleimide inhibited the uptake by preferentially lowering the amount of Si(OH)4 bound. Their action was somewhat variable, depending on the precise nature of the suspending medium, and suggesting that the bound material may represent polymerized forms of Si(OH)4. 7. It is concluded that Si(OH)4 may penetrate the mitochondrial inner membrane by a simple diffusion mechanism. | The uptake of silicic acid by rat liver mitochondria. 1. To gain insight into a putative role for mitochondria in silicon metabolism, mitochondrial uptake (by which it is meant the removal from the medium) of silicic acid [Si(OH)4] was studied under conditions minimizing SI(OH)4 polymerization. 2. Measurements of mitochondrial respiration and swelling indicated indirectly a significant uptake of Si(OH)4 as a weak acid, but this was not confirmed when 31Si(OH)4 was used as a tracer. 31Si(OH)4 occupied a mitochondrial volume similar to that of 3H2O and was relatively unaffected by mitochondrial energy status and by the pH gradient across the mitochondrial inner membrane. 3. Uptake was directly proportional to Si(OH)4 concentration in the range 0-3 mM. 4. The uptake consisted of two components: under all conditions examined, the greater quantity, amounting to 1-2nmol of Si(OH)4/mg of mitochondrial protein, was bound, a major portion of it external to the inner membrane, with the lesser quantity free within the matrix space. 5. Equilibration of 31Si(OH)4 between medium and matrix was a slow process, having a half-time of approx. 10 min at 22 degrees C. 6. Mersalyl and N-ethylmaleimide inhibited the uptake by preferentially lowering the amount of Si(OH)4 bound. Their action was somewhat variable, depending on the precise nature of the suspending medium, and suggesting that the bound material may represent polymerized forms of Si(OH)4. 7. It is concluded that Si(OH)4 may penetrate the mitochondrial inner membrane by a simple diffusion mechanism. | [
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PMID:28730 | The nature of the allosteric interactions of ribonuclease and its ligands. | The allosteric model for ribonuclease activity by Walker, Ralston & Darvey [(1975) Biochem.J. 147, 425--433; (1976) Biochem.J. 153, 329--337] involves the binding of a large number of molecules of substrate or substrate analogue to a series of allosteric sites on the enzyme. In the present paper, the nature of these allosteric interactions is investigated. The effects of ionic strength pH carbamoylation of lysine to homocitrulline and of deamidation of glutamine and asparagine on plots of velocity versus substrate concentration are examined and evidence is presented that the allosteric transition involves an electrostatic interaction between the negatively charged substrate molecules and the cationic groups on the enzyme. | The nature of the allosteric interactions of ribonuclease and its ligands. The allosteric model for ribonuclease activity by Walker, Ralston & Darvey [(1975) Biochem.J. 147, 425--433; (1976) Biochem.J. 153, 329--337] involves the binding of a large number of molecules of substrate or substrate analogue to a series of allosteric sites on the enzyme. In the present paper, the nature of these allosteric interactions is investigated. The effects of ionic strength pH carbamoylation of lysine to homocitrulline and of deamidation of glutamine and asparagine on plots of velocity versus substrate concentration are examined and evidence is presented that the allosteric transition involves an electrostatic interaction between the negatively charged substrate molecules and the cationic groups on the enzyme. | [
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PMID:28731 | Periodate oxidation and the shapes of glycosaminoglycuronans in solution. | 1. It is proposed that periodate oxidation of glycol groups in the repeating units of polysaccharide molecules can be used to probe differences in polymer shapes in solution. 2. Measurement of second-order rate constants (k2) of periodate-glycol reactions may be compared between polymers and relevant monomers, to assess perturbations due to polymer configuration. 3. Factors effecting the measurement and interpretation of k2 are discussed. Over-oxidation, free-radical side reactions, end-group effects, Donnan equilibria and polymer (or molecular-weight) effects are relevant, but their importance is either small or can be minimized in practice. 4. A small group of glycosaminoglycuronans (chondroitin 4- and 6-sulphates and hyaluronate) are oxidized 50--100 times more slowly than three other glycosaminoglycuronans of similar composition, relevant monomers or three homopolyuronides. 5. A stable configuration in solution is postulated for the periodate-resistant polymers, involving carboxylate, acetamido and hydroxy groups in hydrogen-bonded sequences on alternate sides of the molecule. The more easily oxidizable polyuronides are unable to form this configuration. 6. The effect of temperature on the postulated configuration is investigated through the Arrhenius plot of k2, measured to hyaluronate, chondroitin 6-sulphate and methyl 4-O-methyl-alpha-D-glucopyranoside. Probable transitions at high (around 90 degrees C) temperatures were observed for both polymers, with an additional transition at about 37 degrees C in the case of hyaluronate. 7. L-Iduronic acid can take up different conformations depending on the polymer environment. | Periodate oxidation and the shapes of glycosaminoglycuronans in solution. 1. It is proposed that periodate oxidation of glycol groups in the repeating units of polysaccharide molecules can be used to probe differences in polymer shapes in solution. 2. Measurement of second-order rate constants (k2) of periodate-glycol reactions may be compared between polymers and relevant monomers, to assess perturbations due to polymer configuration. 3. Factors effecting the measurement and interpretation of k2 are discussed. Over-oxidation, free-radical side reactions, end-group effects, Donnan equilibria and polymer (or molecular-weight) effects are relevant, but their importance is either small or can be minimized in practice. 4. A small group of glycosaminoglycuronans (chondroitin 4- and 6-sulphates and hyaluronate) are oxidized 50--100 times more slowly than three other glycosaminoglycuronans of similar composition, relevant monomers or three homopolyuronides. 5. A stable configuration in solution is postulated for the periodate-resistant polymers, involving carboxylate, acetamido and hydroxy groups in hydrogen-bonded sequences on alternate sides of the molecule. The more easily oxidizable polyuronides are unable to form this configuration. 6. The effect of temperature on the postulated configuration is investigated through the Arrhenius plot of k2, measured to hyaluronate, chondroitin 6-sulphate and methyl 4-O-methyl-alpha-D-glucopyranoside. Probable transitions at high (around 90 degrees C) temperatures were observed for both polymers, with an additional transition at about 37 degrees C in the case of hyaluronate. 7. L-Iduronic acid can take up different conformations depending on the polymer environment. | [
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PMID:28732 | The enzymes of proline biosynthesis in Escherichia coli. Their molecular weights and the problem of enzyme aggregation. | 1. By using Bio-Gel A1.5M and Sephadex G-150 columns, crude cell-free extracts of Escherichia coli were fractionated to demonstrate the existence of a proline-biosynthetic aggregate. 2. Sephadex G-150 resolves two glutamyl kinases that are inhibited by proline, with mol.wts. of 125000 and 38000, the reactions of which are Mg2+-dependent. The heavier species is more sensitive to inhibition by proline. 3. Gamma-Glutamyl phosphate reductase and 1-pyrroline-5-carboxylate reductase (EC 1.5.1.2) have mol.wts. of approx. 125000 and 190000 respectively, the specific activity of the latter being 5 X 10(3)-fold greater than either of the other two biosynthetic enzymes or of the total pathway in vivo. 4. Bio-Gel A1.5M chromatography gave a single glutamyl kinase of mol.wt. 250000, and the possibility of this being a constituent of an enzyme complex is discussed. | The enzymes of proline biosynthesis in Escherichia coli. Their molecular weights and the problem of enzyme aggregation. 1. By using Bio-Gel A1.5M and Sephadex G-150 columns, crude cell-free extracts of Escherichia coli were fractionated to demonstrate the existence of a proline-biosynthetic aggregate. 2. Sephadex G-150 resolves two glutamyl kinases that are inhibited by proline, with mol.wts. of 125000 and 38000, the reactions of which are Mg2+-dependent. The heavier species is more sensitive to inhibition by proline. 3. Gamma-Glutamyl phosphate reductase and 1-pyrroline-5-carboxylate reductase (EC 1.5.1.2) have mol.wts. of approx. 125000 and 190000 respectively, the specific activity of the latter being 5 X 10(3)-fold greater than either of the other two biosynthetic enzymes or of the total pathway in vivo. 4. Bio-Gel A1.5M chromatography gave a single glutamyl kinase of mol.wt. 250000, and the possibility of this being a constituent of an enzyme complex is discussed. | [
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PMID:28733 | pH-dependent changes of intrinsic fluorescence of chemically modified liver alcohol dehydrogenases. | Horse liver alcohol dehydrogenase specifically carboxymethylated on cysteine-46 (a ligand to the zinc in the active site) or acetimidylated on 25 of the 30 lysine residues per subunit (including residue 228) was studied. The tryptophan fluorescence of these enzymes decreased by 35% as pH was increased, with an apparent pKa of 9.8 +/- 0.2, identical with that of native enzyme. Native enzyme in the presence of 30mM-imidazole, which displaces a water molecule ligated to the zinc, also had a pKa of 9.8. The ionoizable group is thus neither the water molecule nor one of the modified groups. Binding of NAD+ shifted the pKa for the fluorescence transition to 7.6 with native enzyme and to 9.0 with acetimidylated enzyme, but did not shift the pKa of carboxymethylated enzyme. Binding of NAD+ and trifluoroethanol, an unreactive alcohol, gave maximal fluorescence quenching at pH7 with all three enzymes. The acetimidylated enzyme--NAD+--trifluoroethanol complex had an apparent pKa of 5.0, but the pK of the native enzyme complex was experimentally inaccessible. The results are interpreted in terms of coupled equilibria between two different conformational states. On binding of NAD+, the modified enzymes apparently change conformation less readily than does native enzyme, but binding of alcohol can drive the change to completion. | pH-dependent changes of intrinsic fluorescence of chemically modified liver alcohol dehydrogenases. Horse liver alcohol dehydrogenase specifically carboxymethylated on cysteine-46 (a ligand to the zinc in the active site) or acetimidylated on 25 of the 30 lysine residues per subunit (including residue 228) was studied. The tryptophan fluorescence of these enzymes decreased by 35% as pH was increased, with an apparent pKa of 9.8 +/- 0.2, identical with that of native enzyme. Native enzyme in the presence of 30mM-imidazole, which displaces a water molecule ligated to the zinc, also had a pKa of 9.8. The ionoizable group is thus neither the water molecule nor one of the modified groups. Binding of NAD+ shifted the pKa for the fluorescence transition to 7.6 with native enzyme and to 9.0 with acetimidylated enzyme, but did not shift the pKa of carboxymethylated enzyme. Binding of NAD+ and trifluoroethanol, an unreactive alcohol, gave maximal fluorescence quenching at pH7 with all three enzymes. The acetimidylated enzyme--NAD+--trifluoroethanol complex had an apparent pKa of 5.0, but the pK of the native enzyme complex was experimentally inaccessible. The results are interpreted in terms of coupled equilibria between two different conformational states. On binding of NAD+, the modified enzymes apparently change conformation less readily than does native enzyme, but binding of alcohol can drive the change to completion. | [
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PMID:28734 | The inactivation of native enzymes by a neutral proteinase from rat intestinal muscle. | 1. The solubilization and partial purification of a proteinase from the intestinal smooth muscle of rats fed on protein-free diets are described. 2. It has a mol.wt. of about 33000 and it is stable over a narrow pH range. 3. From its susceptibility to known modifers of proteolytic enzymes, it appears to be a serine proteinase of a trypsin-like nature. Active-site titration with soya-bean trypsin inhibitor shows that the concentration of proteinase was about 3 microgram/g wet wt. of intestinal smooth muscle. However, the muscle proteinase demonstrates a marked ability for inactivating enzymes in their native conformation at neutral pH. It is about 100 times more efficient than pancreatic trypsin when the inactivating activities are compared on an approximately equimolar basis. 4. Inactivation of the substrate enzymes is accompanied by limited proteolysis, as demonstrated by sodium dodecyl sulphate/polyacrylamide-gel electrophoresis. 5. An endogenous inhibitor was separated from the proteinase by fractionation with (NH4)2SO4. 6. Contamination of the muscle tissue by lumen, mucosal or blood proteinases and inhibitors is shown to be unlikely. 7. A role for the neutral trypsin-like proteinase in initiating the degradation of intracellular enzymes is considered. | The inactivation of native enzymes by a neutral proteinase from rat intestinal muscle. 1. The solubilization and partial purification of a proteinase from the intestinal smooth muscle of rats fed on protein-free diets are described. 2. It has a mol.wt. of about 33000 and it is stable over a narrow pH range. 3. From its susceptibility to known modifers of proteolytic enzymes, it appears to be a serine proteinase of a trypsin-like nature. Active-site titration with soya-bean trypsin inhibitor shows that the concentration of proteinase was about 3 microgram/g wet wt. of intestinal smooth muscle. However, the muscle proteinase demonstrates a marked ability for inactivating enzymes in their native conformation at neutral pH. It is about 100 times more efficient than pancreatic trypsin when the inactivating activities are compared on an approximately equimolar basis. 4. Inactivation of the substrate enzymes is accompanied by limited proteolysis, as demonstrated by sodium dodecyl sulphate/polyacrylamide-gel electrophoresis. 5. An endogenous inhibitor was separated from the proteinase by fractionation with (NH4)2SO4. 6. Contamination of the muscle tissue by lumen, mucosal or blood proteinases and inhibitors is shown to be unlikely. 7. A role for the neutral trypsin-like proteinase in initiating the degradation of intracellular enzymes is considered. | [
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PMID:28735 | Kinetics and mechanism of the rat brain phenol sulphotransferase reaction. | Some properties of rat brain phenol sulphotransferase were investigated in in vitro at pH7.4. The enzyme was purified 10-fold by chromatography on DEAE-Sephadex -50. It can be assayed with 4-hydroxy-3-methoxyphenylethylene glycol or 4-methylumbelliferone as the sulphate acceptor. The partially purified enzyme is stable for at least 1 week when stored at 4 degrees C. It is, however, additionally activated (10--20%) and stabilized by 1 mM-dithiothreitol. The activity of the enzyme does not depend on the addition of exogenous Mg2+. The pH optima for the sulphation of 4-hydroxy-3-methoxyphenylethylene glycol and 4-methylumbelliferone are 7.8 and 7.4 respectively. Substrate inhibition by the sulphate acceptor is apparent at concentrations over 0.05mM. Initial-velocity studies in the absence and presence of product and dead-end inhibitors suggested that the mechanism of the rat brain sulphotransferase reaction is sequential ordered Bi Bi with a dead-end complex of enzyme with adenosine 3',5'-biphosphate and sulphate acceptor. The sulphate donor adenosine 3'-phosphate 5'-sulphatophosphate is the first substrate that adds to the enzyme, and the sulphate acceptor is the second substrate. The dissociation constant for the complex of enzyme with sulphate donor is 21 micron. The sulphated substrate is the first product and adenosine 3',5'-biphosphate is the second product that leaves the enzyme. | Kinetics and mechanism of the rat brain phenol sulphotransferase reaction. Some properties of rat brain phenol sulphotransferase were investigated in in vitro at pH7.4. The enzyme was purified 10-fold by chromatography on DEAE-Sephadex -50. It can be assayed with 4-hydroxy-3-methoxyphenylethylene glycol or 4-methylumbelliferone as the sulphate acceptor. The partially purified enzyme is stable for at least 1 week when stored at 4 degrees C. It is, however, additionally activated (10--20%) and stabilized by 1 mM-dithiothreitol. The activity of the enzyme does not depend on the addition of exogenous Mg2+. The pH optima for the sulphation of 4-hydroxy-3-methoxyphenylethylene glycol and 4-methylumbelliferone are 7.8 and 7.4 respectively. Substrate inhibition by the sulphate acceptor is apparent at concentrations over 0.05mM. Initial-velocity studies in the absence and presence of product and dead-end inhibitors suggested that the mechanism of the rat brain sulphotransferase reaction is sequential ordered Bi Bi with a dead-end complex of enzyme with adenosine 3',5'-biphosphate and sulphate acceptor. The sulphate donor adenosine 3'-phosphate 5'-sulphatophosphate is the first substrate that adds to the enzyme, and the sulphate acceptor is the second substrate. The dissociation constant for the complex of enzyme with sulphate donor is 21 micron. The sulphated substrate is the first product and adenosine 3',5'-biphosphate is the second product that leaves the enzyme. | [
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PMID:28736 | Inactivation of glutamate dehydrogenase and glutamate synthase from Bacillus megaterium by phenylglyoxal, butane-2,3-dione and pyridoxal 5'-phosphate. | Reaction of phenylglyoxal with glutamate dehydrogenase (EC 1.4.1.4), but not with glutamate synthase (EC 2.6.1.53), from Bacillus megaterium resulted in complete loss of enzyme activity. NADPH alone or together with 2-oxoglutarate provided substantial protection from inactivation by phenylglyoxal. Some 2mol of [14C]Phenylglyoxal was incorporated/mol of subunit of glutamate dehydrogenase. Addition of 1mM-NADPH decreased incorporation by 0.7mol. The Ki for phenylglyoxal was 6.7mM and Ks for competition with NADPH was 0.5mM. Complete inactivation of glutamate dehydrogenase by butane-2,3-dione was estimated by extrapolation to result from the loss of 3 of the 19 arginine residues/subunit. NADPH, but not NADH, provided almost complete protection against inactivation. Butane-2,3-dione had only a slight inactivating effect on glutamate synthase. The data suggest that an essential arginine residue may be involved in the binding of NADPH to glutamate dehydrogenase. The enzymes were inactivated by pyridoxal 5'-phosphate and this inactivation increased 3--4-fold in the borate buffer. NADPH completely prevented inactivation by pyridoxal 5'-phosphate. | Inactivation of glutamate dehydrogenase and glutamate synthase from Bacillus megaterium by phenylglyoxal, butane-2,3-dione and pyridoxal 5'-phosphate. Reaction of phenylglyoxal with glutamate dehydrogenase (EC 1.4.1.4), but not with glutamate synthase (EC 2.6.1.53), from Bacillus megaterium resulted in complete loss of enzyme activity. NADPH alone or together with 2-oxoglutarate provided substantial protection from inactivation by phenylglyoxal. Some 2mol of [14C]Phenylglyoxal was incorporated/mol of subunit of glutamate dehydrogenase. Addition of 1mM-NADPH decreased incorporation by 0.7mol. The Ki for phenylglyoxal was 6.7mM and Ks for competition with NADPH was 0.5mM. Complete inactivation of glutamate dehydrogenase by butane-2,3-dione was estimated by extrapolation to result from the loss of 3 of the 19 arginine residues/subunit. NADPH, but not NADH, provided almost complete protection against inactivation. Butane-2,3-dione had only a slight inactivating effect on glutamate synthase. The data suggest that an essential arginine residue may be involved in the binding of NADPH to glutamate dehydrogenase. The enzymes were inactivated by pyridoxal 5'-phosphate and this inactivation increased 3--4-fold in the borate buffer. NADPH completely prevented inactivation by pyridoxal 5'-phosphate. | [
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PMID:28737 | Properties of matrix-bound dimer and monomer derivatives of immobilized creatine kinase from rabbit skeletal muscle. | Dimeric creatine kinase (EC 2.7.3.2) from rabbit skeletal muscle can be immobilized via a single subunit to CNBr-activated Sepharose 4B and subsequently treated with guanidine hydrochloride followed by renaturation to yield a catalytically active matrix-bound subunit derivative. The importance of the intact dimeric structure in the activation of the enzyme by acetate was demonstrated. Immobilization did not appear to alter the pH optimum of the enzyme, and the kinetic parameters fot the matrix-bound derivatives were generally similar to those for the soluble enzyme, but the matrix-bound derivatives showed higher thermal stability and greater resistance to denaturation than did the soluble enzyme. The rates of reaction of thiol groups of the matrix-bound derivatives with iodoacetamide in the absence and in the presence of combinations of substrates were similar to those of the soluble enzyme. Studies with 5,5'-dithiobis-(2-nitrobenzoic acid) and with iodoacetamide revealed the presence of an additional reactive thiol group in the matrix-bound subunit derivative, which is presumably masked in the dimeric derivatives. | Properties of matrix-bound dimer and monomer derivatives of immobilized creatine kinase from rabbit skeletal muscle. Dimeric creatine kinase (EC 2.7.3.2) from rabbit skeletal muscle can be immobilized via a single subunit to CNBr-activated Sepharose 4B and subsequently treated with guanidine hydrochloride followed by renaturation to yield a catalytically active matrix-bound subunit derivative. The importance of the intact dimeric structure in the activation of the enzyme by acetate was demonstrated. Immobilization did not appear to alter the pH optimum of the enzyme, and the kinetic parameters fot the matrix-bound derivatives were generally similar to those for the soluble enzyme, but the matrix-bound derivatives showed higher thermal stability and greater resistance to denaturation than did the soluble enzyme. The rates of reaction of thiol groups of the matrix-bound derivatives with iodoacetamide in the absence and in the presence of combinations of substrates were similar to those of the soluble enzyme. Studies with 5,5'-dithiobis-(2-nitrobenzoic acid) and with iodoacetamide revealed the presence of an additional reactive thiol group in the matrix-bound subunit derivative, which is presumably masked in the dimeric derivatives. | [
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PMID:28738 | Purification and immunochemical characterization of malate synthase from Euglena gracilis. | Malate synthase (EC 4.1.3.2) from dark-grown Euglena gracilis was purified to homogeneity by the criterion of polyacrylamide-gel electrophoresis. The enzyme was released from acetate-grown cells by treatment with ultrasonic waves and purified from broken-cell suspensions by high-speed centrifugation and (NH4)2SO4 fractionation, followed by gel-filtration on Sepharose 6B. The final enzyme preparation was purified 190-fold compared with the crude extract. The mol.wt. of the enzyme was about 350000 as determined by gel filtration on Sepharose 6B. Treatment with sodium dodecyl sulphate and urea dissociated the enzyme into subunits of mol.wt. 175000. The pH optimum for the enzyme was 8.0 and the Km values for glyoxylate and acetyl-CoA were 50 and 80 micron respectively. Antibodies raised to the purified enzyme were shown to be monospecific by radiochemical immunoassay. Euglena anti-(malate synthase) tested on Ouchterlony double-diffusion gels gave a sharp precipitation band against acetate-grown Escherichia coli, but no immunological correspondence was observed with acetate-grown Chlorella fusca, Zea mays (maize) scutella or purified malate synthase from Ricinus communis. | Purification and immunochemical characterization of malate synthase from Euglena gracilis. Malate synthase (EC 4.1.3.2) from dark-grown Euglena gracilis was purified to homogeneity by the criterion of polyacrylamide-gel electrophoresis. The enzyme was released from acetate-grown cells by treatment with ultrasonic waves and purified from broken-cell suspensions by high-speed centrifugation and (NH4)2SO4 fractionation, followed by gel-filtration on Sepharose 6B. The final enzyme preparation was purified 190-fold compared with the crude extract. The mol.wt. of the enzyme was about 350000 as determined by gel filtration on Sepharose 6B. Treatment with sodium dodecyl sulphate and urea dissociated the enzyme into subunits of mol.wt. 175000. The pH optimum for the enzyme was 8.0 and the Km values for glyoxylate and acetyl-CoA were 50 and 80 micron respectively. Antibodies raised to the purified enzyme were shown to be monospecific by radiochemical immunoassay. Euglena anti-(malate synthase) tested on Ouchterlony double-diffusion gels gave a sharp precipitation band against acetate-grown Escherichia coli, but no immunological correspondence was observed with acetate-grown Chlorella fusca, Zea mays (maize) scutella or purified malate synthase from Ricinus communis. | [
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PMID:28739 | Effects of prolonged administration of high molecular levan on arterial blood gases, oxygen transport and acid base balance in rabbits. | The effect of daily intraperitoneal injections of 100 mg of high molecular levan for 4-6 weeks on a number of physiological parameters was studied in rabbits. The parameters studied included whole blood pH, blood gases and acid-base balance. Control rabbits were similarly treated with physiological saline. In five rabbits T-50 was determined after levan treatment. None of the studied parameters was significantly affected by the levan treatment. | Effects of prolonged administration of high molecular levan on arterial blood gases, oxygen transport and acid base balance in rabbits. The effect of daily intraperitoneal injections of 100 mg of high molecular levan for 4-6 weeks on a number of physiological parameters was studied in rabbits. The parameters studied included whole blood pH, blood gases and acid-base balance. Control rabbits were similarly treated with physiological saline. In five rabbits T-50 was determined after levan treatment. None of the studied parameters was significantly affected by the levan treatment. | [
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PMID:28740 | [Correlation of vasospasm and intracranial metabolism under experimental subarachnoid hemorrhage--Part 1. In reference with the acid-base-balance of cerebral blood and cerebrospinal fluid]. | Cerebral vasospasm, cerebral metabolism and the acid-base-balance of blood and cerebrospinal fluid of dogs were studied during and after the experimental subarachnoid hemorrhage. Subarachnoid hemorrhage was induced by infusion of fresh blood into the basal cistern through a small sraniectomy in the base of the skull. Eighty adult mongrel dogs were used. Of these a complete recording was obtained in 32 cases under the constant controlled ventilation. The samples of the blood and cerebrospinal fluid (CSF) were obtained repeatedly at the inserted 1 to 3 hours from the Polyethylene tube inserted into the cisterna magna subarachnoid space, carotid artery and internal jugular vein. During these procedures, the luminal size of the intracranial basal artery was measured angiographically. Vasoconstriction of the cerebral arteries in response to experimental subarachnoid hemorrhage had a biphasic course, an acute phase (the vasoconstrictive phenomenon which lasts less than 6 hours) and chronic phase (the revasoconstriction occured and continued more than 24 hours after the hemorrhage). The former was named "Released Group" which consists of 16 dogs and the later was named "Prolonged Group" which consists of 20 dogs. In both group, pH and bicarbonate ion concentration of CSF were found to be reduced by twenty percent of the normal value on the aveaage about three hours after subarachnoid hemorrage, apparently reflecting occurence of early cerebral vasospasm. Remarkable metabolic acidosis was seen in CSF of the prolonged group as compared with in cerebral blood. The occurrence of A-V shunt was suggested in the cerebral circulation from the blood gas findings. The experimental results indicates that prolonged cerebral vasospams phenomenon causes persistent hypoxic state in the cerebral tissue. However, cellular metabolism of cerebral tissue will be probably maintained by oxygen supply necessary to cellular respiration through the blood-brain barrier from the cerebrospinal fluid. | [Correlation of vasospasm and intracranial metabolism under experimental subarachnoid hemorrhage--Part 1. In reference with the acid-base-balance of cerebral blood and cerebrospinal fluid]. Cerebral vasospasm, cerebral metabolism and the acid-base-balance of blood and cerebrospinal fluid of dogs were studied during and after the experimental subarachnoid hemorrhage. Subarachnoid hemorrhage was induced by infusion of fresh blood into the basal cistern through a small sraniectomy in the base of the skull. Eighty adult mongrel dogs were used. Of these a complete recording was obtained in 32 cases under the constant controlled ventilation. The samples of the blood and cerebrospinal fluid (CSF) were obtained repeatedly at the inserted 1 to 3 hours from the Polyethylene tube inserted into the cisterna magna subarachnoid space, carotid artery and internal jugular vein. During these procedures, the luminal size of the intracranial basal artery was measured angiographically. Vasoconstriction of the cerebral arteries in response to experimental subarachnoid hemorrhage had a biphasic course, an acute phase (the vasoconstrictive phenomenon which lasts less than 6 hours) and chronic phase (the revasoconstriction occured and continued more than 24 hours after the hemorrhage). The former was named "Released Group" which consists of 16 dogs and the later was named "Prolonged Group" which consists of 20 dogs. In both group, pH and bicarbonate ion concentration of CSF were found to be reduced by twenty percent of the normal value on the aveaage about three hours after subarachnoid hemorrage, apparently reflecting occurence of early cerebral vasospasm. Remarkable metabolic acidosis was seen in CSF of the prolonged group as compared with in cerebral blood. The occurrence of A-V shunt was suggested in the cerebral circulation from the blood gas findings. The experimental results indicates that prolonged cerebral vasospams phenomenon causes persistent hypoxic state in the cerebral tissue. However, cellular metabolism of cerebral tissue will be probably maintained by oxygen supply necessary to cellular respiration through the blood-brain barrier from the cerebrospinal fluid. | [
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PMID:28745 | Characterization of the reaction of methyl acetimidate with sperm whale myoglobin. | The effects of pH, acetimidate concentration, temperature, and reaction time of methyl acetimidate with sperm whale myoglobulin have been assessed. Reaction at pH 9.8 and 15 degrees C for 30 min with a sixfold excess of methyl acetimidate relative to each amino group yielded six acetimidomyoglobin derivatives which were separated and purified. Reaction with tetrahydrophthalic anhydride revealed the number of amino groups that remained unreacted in each separated component and made possible further subractionation. Modification at the NH2 terminus was quantitated by automated stepwise Edman degradation. The acetimidyl and tetrahydrophthalyl groups, were readily removable. The potentiometric titration of three of the completely deprotected components showed identity with the parent untreated sperm whale myoglobin. The first of two major products was acetimidated at all 19 epsilon-amino groups but not at the NH2 terminus. The second major product bore a blocked NH2 terminus but retained one unmodified epsilon-amino group, identified after modification by trinitrobenzenesulfonate as lysine residue 77. Of the minor components, one was identified as completely acetimidated at all 20 amino groups. The other three minor components appeared to contain irreversible by-products. | Characterization of the reaction of methyl acetimidate with sperm whale myoglobin. The effects of pH, acetimidate concentration, temperature, and reaction time of methyl acetimidate with sperm whale myoglobulin have been assessed. Reaction at pH 9.8 and 15 degrees C for 30 min with a sixfold excess of methyl acetimidate relative to each amino group yielded six acetimidomyoglobin derivatives which were separated and purified. Reaction with tetrahydrophthalic anhydride revealed the number of amino groups that remained unreacted in each separated component and made possible further subractionation. Modification at the NH2 terminus was quantitated by automated stepwise Edman degradation. The acetimidyl and tetrahydrophthalyl groups, were readily removable. The potentiometric titration of three of the completely deprotected components showed identity with the parent untreated sperm whale myoglobin. The first of two major products was acetimidated at all 19 epsilon-amino groups but not at the NH2 terminus. The second major product bore a blocked NH2 terminus but retained one unmodified epsilon-amino group, identified after modification by trinitrobenzenesulfonate as lysine residue 77. Of the minor components, one was identified as completely acetimidated at all 20 amino groups. The other three minor components appeared to contain irreversible by-products. | [
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PMID:28746 | Properties of D-amino acid oxidase covalently modified upon its oxidation of D-propargylglycine. | Upon oxidation of D-propargylglycine by D-amino acid oxidase, the enzyme is converted by covalent alkylation to catalytic species with different properties from those of native enzyme. At least five distinct modified enzyme species are present in the preparation, as determined by gel electro-focusing. Individual characterization of the components has not yet been attempted. The combined kinetic and spectral properties of the preparation have been studied. The modified enzymes have a marked preference for hydrophobic amino acids: the rates of oxidation decrease in the series D-phenylalanine, D-methionine, D-norleucine, D-norvaline, D-alpha-aminobutyrate, D-alanine. In addition, the observed Kms of the amino acids are increased, especially those of the smaller substrates (D-alanine and D-alpha-aminobutyrate). A primary kinetic isotope effect is observed upon oxidation of amino acids by the modified enzymes, evidence that this catalysis exhibits a different rate-determining step from catalysis by native enzyme. The modified apoenzyme exhibits intense absorbance at 318--320 nm, not present in native enzyme. This chromophore can be partially (75%) removed by treatment of the modified enzyme with hydrazine. However, the activity of native enzyme is not substantially restored by this process, suggesting the existence of superficial alkylations in addition to the modification responsible for the observed changes in kinetic parameters. | Properties of D-amino acid oxidase covalently modified upon its oxidation of D-propargylglycine. Upon oxidation of D-propargylglycine by D-amino acid oxidase, the enzyme is converted by covalent alkylation to catalytic species with different properties from those of native enzyme. At least five distinct modified enzyme species are present in the preparation, as determined by gel electro-focusing. Individual characterization of the components has not yet been attempted. The combined kinetic and spectral properties of the preparation have been studied. The modified enzymes have a marked preference for hydrophobic amino acids: the rates of oxidation decrease in the series D-phenylalanine, D-methionine, D-norleucine, D-norvaline, D-alpha-aminobutyrate, D-alanine. In addition, the observed Kms of the amino acids are increased, especially those of the smaller substrates (D-alanine and D-alpha-aminobutyrate). A primary kinetic isotope effect is observed upon oxidation of amino acids by the modified enzymes, evidence that this catalysis exhibits a different rate-determining step from catalysis by native enzyme. The modified apoenzyme exhibits intense absorbance at 318--320 nm, not present in native enzyme. This chromophore can be partially (75%) removed by treatment of the modified enzyme with hydrazine. However, the activity of native enzyme is not substantially restored by this process, suggesting the existence of superficial alkylations in addition to the modification responsible for the observed changes in kinetic parameters. | [
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PMID:28748 | Quantitation of hydrogen ion and potential gradients in gastric plasma membrane vesicles. | The ATP-dependent uptake of H+ by hog gastric parietal cell vesicles was quantitated by using the pH indicator dyes bromcresol green and malachite green, the weak bases, aminopyrine and 9-aminoacridine, and the pH electrode. A K+-dependent H+ uptake was found, with a significant difference between the quantity of H+ disappearing from the medium (deltaHo) and the quantity appearing inside the vesicle (deltaHi). 9-Aminoacridine gave a lower value for the deltaHi than any of the other probes. Probes of potential such as diethyloxadicarbocyanine or oxonol dyes showed that only secondary diffusion potentials occurred during H+ uptake and that the cationic dyes in the presence of protonophores could also be used to quantitate H+ uptake. The potential in the presence of protonophore indicated a deltaHi greater than that found with the other probes. Binding sites for acridine orange were generated either by ATP or an artificial pH gradient and corresponded to the deltaHi indicated by aminopyrine. SCN- (30mM) only partially inhibited the H+ gradient, and this, coupled with the failure to detect the physiological deltapH of 6.6, indicated that these vesicles may be an incomplete model of gastric acid secretion. | Quantitation of hydrogen ion and potential gradients in gastric plasma membrane vesicles. The ATP-dependent uptake of H+ by hog gastric parietal cell vesicles was quantitated by using the pH indicator dyes bromcresol green and malachite green, the weak bases, aminopyrine and 9-aminoacridine, and the pH electrode. A K+-dependent H+ uptake was found, with a significant difference between the quantity of H+ disappearing from the medium (deltaHo) and the quantity appearing inside the vesicle (deltaHi). 9-Aminoacridine gave a lower value for the deltaHi than any of the other probes. Probes of potential such as diethyloxadicarbocyanine or oxonol dyes showed that only secondary diffusion potentials occurred during H+ uptake and that the cationic dyes in the presence of protonophores could also be used to quantitate H+ uptake. The potential in the presence of protonophore indicated a deltaHi greater than that found with the other probes. Binding sites for acridine orange were generated either by ATP or an artificial pH gradient and corresponded to the deltaHi indicated by aminopyrine. SCN- (30mM) only partially inhibited the H+ gradient, and this, coupled with the failure to detect the physiological deltapH of 6.6, indicated that these vesicles may be an incomplete model of gastric acid secretion. | [
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PMID:28750 | Threonine inhibition of the aspartokinase--homoserine dehydrogenase I of Escherichia coli. Threonine binding studies. | Both activities of the aspartokinase--homoserine I (AK-HSD) of Escherichia coli are inhibited by threonine. Careful threonine binding studies have now been done which have allowed us to distinguish the various effects of threonine on the enzyme. The ultrafiltration technique of H. Paulus ((1969) Anal. Biochem. 32, 101) for measuring ligand binding was shown to be comparable with equilibrium dialysis techniques. Reduction in error by utilization of this procedure enabled us to obtain evidence for two different sets of threonine sites by direct binding studies. The binding data were mathematically consistent with two independent classes of threonine sites, each of which contained four sites per tetramer and had a Hill coefficient of about 2.3--2.5. KD for the second set of sites was five- to tenfold greater than the high affinity sites, depending upon conditions. The data now suggest that the sequential model for site--site interactions adequately describes the cooperativity of threonine binding to the high affinity set of sites. | Threonine inhibition of the aspartokinase--homoserine dehydrogenase I of Escherichia coli. Threonine binding studies. Both activities of the aspartokinase--homoserine I (AK-HSD) of Escherichia coli are inhibited by threonine. Careful threonine binding studies have now been done which have allowed us to distinguish the various effects of threonine on the enzyme. The ultrafiltration technique of H. Paulus ((1969) Anal. Biochem. 32, 101) for measuring ligand binding was shown to be comparable with equilibrium dialysis techniques. Reduction in error by utilization of this procedure enabled us to obtain evidence for two different sets of threonine sites by direct binding studies. The binding data were mathematically consistent with two independent classes of threonine sites, each of which contained four sites per tetramer and had a Hill coefficient of about 2.3--2.5. KD for the second set of sites was five- to tenfold greater than the high affinity sites, depending upon conditions. The data now suggest that the sequential model for site--site interactions adequately describes the cooperativity of threonine binding to the high affinity set of sites. | [
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PMID:28755 | Sidedness of inhibition of energy transduction in oxidative phosphorylation in rat liver mitochondria by ethidium bromide. | Ethidium bromide, a new type of inhibitor of energy transduction in oxidative phosphorylation, inhibited ATP synthesis in intact mitochondria but not in submitochondrial particles, the latter being inside-out relative to the membranes of intact mitochondria. Ethidium bromide incorporated inside the submitochondrial particles inhibited ATP synthesis in the particles. The decrease of the membrane potential by valinomycin (plus KCl) inhibited only slightly the energy-dependent binding of ethidium bromide to the mitochondria. The present results show clearly that ethidium bromide inhibited energy transduction in oxidative phosphorylation by acting on the outer side (C-side) of the inner mitochondrial membrane, perhaps by neutralizing negative charges created on the surface of the C-side, and that it had no inhibitory activity on the inner side (M-side) of the membrane. Th present results show also that the energy-dependent binding of ethidium is not due to electrophoretic transport down the membrane potential; ethidium may bind to negative charges on the surface of the C-side. The present study suggest that an anisotropic distribution of electric charge in the inner mitochondrial membrane is an intermediary high energy state of oxidatvie phosphorylation. | Sidedness of inhibition of energy transduction in oxidative phosphorylation in rat liver mitochondria by ethidium bromide. Ethidium bromide, a new type of inhibitor of energy transduction in oxidative phosphorylation, inhibited ATP synthesis in intact mitochondria but not in submitochondrial particles, the latter being inside-out relative to the membranes of intact mitochondria. Ethidium bromide incorporated inside the submitochondrial particles inhibited ATP synthesis in the particles. The decrease of the membrane potential by valinomycin (plus KCl) inhibited only slightly the energy-dependent binding of ethidium bromide to the mitochondria. The present results show clearly that ethidium bromide inhibited energy transduction in oxidative phosphorylation by acting on the outer side (C-side) of the inner mitochondrial membrane, perhaps by neutralizing negative charges created on the surface of the C-side, and that it had no inhibitory activity on the inner side (M-side) of the membrane. Th present results show also that the energy-dependent binding of ethidium is not due to electrophoretic transport down the membrane potential; ethidium may bind to negative charges on the surface of the C-side. The present study suggest that an anisotropic distribution of electric charge in the inner mitochondrial membrane is an intermediary high energy state of oxidatvie phosphorylation. | [
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PMID:28756 | Mechanism of generation and regulation of photopotential by bacteriorhodopsin in bimolecular lipid membrane. | Photoelectric properties of bacteriorhodopsin incorporated into a bimolecular lipid membrane were investigated with special regard to the mechanism of photoelectric field generation. It was shown that besides its proton pump and electric generator functions bacteriorhodopsin works as a possible molecular regulator of the light-induced membrane potential. When a bimolecular lipid membrane containing bacteriorhodopsin is continuously illuminated in its main visible absorption band, and afterwards by superimposed blue light matching the absorption band of the long-living photobleached bacteriorhodopsin (M412) as well, the latter either enhances or decreases the steady-state photoresponse, depending upon the intensity of the green light. Thus, the additional blue-light illumination tends to cause the resultant photoelectric membrane potential to become stabilized. Two alternative schemes are tentatively proposed for the photochemical cycle of bacteriorhodopsin whereby blue light can control photovoltage generation. A kinetic model of the proton pump and the regulation of the photoelectric membrane potential is presented. This model fits all the experimental findings, even quantitatively. From the model some kinetic and physical parameters of this light-driven pump could be determined. | Mechanism of generation and regulation of photopotential by bacteriorhodopsin in bimolecular lipid membrane. Photoelectric properties of bacteriorhodopsin incorporated into a bimolecular lipid membrane were investigated with special regard to the mechanism of photoelectric field generation. It was shown that besides its proton pump and electric generator functions bacteriorhodopsin works as a possible molecular regulator of the light-induced membrane potential. When a bimolecular lipid membrane containing bacteriorhodopsin is continuously illuminated in its main visible absorption band, and afterwards by superimposed blue light matching the absorption band of the long-living photobleached bacteriorhodopsin (M412) as well, the latter either enhances or decreases the steady-state photoresponse, depending upon the intensity of the green light. Thus, the additional blue-light illumination tends to cause the resultant photoelectric membrane potential to become stabilized. Two alternative schemes are tentatively proposed for the photochemical cycle of bacteriorhodopsin whereby blue light can control photovoltage generation. A kinetic model of the proton pump and the regulation of the photoelectric membrane potential is presented. This model fits all the experimental findings, even quantitatively. From the model some kinetic and physical parameters of this light-driven pump could be determined. | [
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PMID:28757 | Two distinct rhodopsin molecules within the disc membrane of vertebrate rod outer segments. | The kinetics of the metarhodopsin I-II reaction have been measured over a wide range of temperatures (1-37C ) and pH values (4.5-8) with suspensions containing fragments of bovine rod outer segments. It was found that for all conditions the occurrence of metarhodopsin II could be described by two independent first-order processes. The fast component: slow component amplitude ratio depends upon pH and temperature. The kinetics of the lumi-metarhodopsin I reaction show the same pH dependence for the fast component: slow component amplitude ratio as the one observed for the metarhodopsin II signals. All the results observed could be described with the assumption that rhodopsin itself exists in two conformational states before bleaching which are in a pH and temperature-dependent equilibrium. This hypothesis is confirmed by its ability to explain some apparently anomalous observations in the literature. | Two distinct rhodopsin molecules within the disc membrane of vertebrate rod outer segments. The kinetics of the metarhodopsin I-II reaction have been measured over a wide range of temperatures (1-37C ) and pH values (4.5-8) with suspensions containing fragments of bovine rod outer segments. It was found that for all conditions the occurrence of metarhodopsin II could be described by two independent first-order processes. The fast component: slow component amplitude ratio depends upon pH and temperature. The kinetics of the lumi-metarhodopsin I reaction show the same pH dependence for the fast component: slow component amplitude ratio as the one observed for the metarhodopsin II signals. All the results observed could be described with the assumption that rhodopsin itself exists in two conformational states before bleaching which are in a pH and temperature-dependent equilibrium. This hypothesis is confirmed by its ability to explain some apparently anomalous observations in the literature. | [
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PMID:28758 | Inside-out membrane vesicles isolated from spinach thylakoids. | Inside-out thylakoid vesicles have been separated from right-side-out material after press disruption of chloroplast lamellae. The sepration was obtained by partitionin an aqueous dextran-polyethylene glycol two-phase system, a method which utilizes differences in surface properties for separation of membrane particles. The isolated thylakoid vesicles showed the following inside-out properties: (1) light-induced reversible proton extrusion into the surrounding medium when supplied with the Photosystem II electron acceptor phenyl-p-benzoquinone; (2) a pH rise in the internal phase accompanying the external proton release, (3) sensitivity to trypsin treatment different from that of thylakoid membranes of normal orientation; (4) concave EF and convex PF freeze-fracture faces. | Inside-out membrane vesicles isolated from spinach thylakoids. Inside-out thylakoid vesicles have been separated from right-side-out material after press disruption of chloroplast lamellae. The sepration was obtained by partitionin an aqueous dextran-polyethylene glycol two-phase system, a method which utilizes differences in surface properties for separation of membrane particles. The isolated thylakoid vesicles showed the following inside-out properties: (1) light-induced reversible proton extrusion into the surrounding medium when supplied with the Photosystem II electron acceptor phenyl-p-benzoquinone; (2) a pH rise in the internal phase accompanying the external proton release, (3) sensitivity to trypsin treatment different from that of thylakoid membranes of normal orientation; (4) concave EF and convex PF freeze-fracture faces. | [
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PMID:28759 | Effect of chemical modification of amino groups by fluorescamine on partial reactions of photosynthesis. | 4-Phenylspiro [furan-2(3H),1-phtalan]3,3'-dione (fluorescamine) was used to covalently modify amino groups of thylakoids. Subsequently its effect on parameters of energy transfer and phosphorylating activity was assessed. While electron transport, the extent of proton uptake, 515 nm change and 9-aminoacridine quench were relatively resistant to such treatment, the functions connected to coupling factor 1, namely ATP formation by acid/base transition, ATPase activity and photophosphorylation were affected much earlier. Photophosphorylation appears to be the most sensitive. The data are interpreted as indicating an involvement of free amino groups in energy transfer. | Effect of chemical modification of amino groups by fluorescamine on partial reactions of photosynthesis. 4-Phenylspiro [furan-2(3H),1-phtalan]3,3'-dione (fluorescamine) was used to covalently modify amino groups of thylakoids. Subsequently its effect on parameters of energy transfer and phosphorylating activity was assessed. While electron transport, the extent of proton uptake, 515 nm change and 9-aminoacridine quench were relatively resistant to such treatment, the functions connected to coupling factor 1, namely ATP formation by acid/base transition, ATPase activity and photophosphorylation were affected much earlier. Photophosphorylation appears to be the most sensitive. The data are interpreted as indicating an involvement of free amino groups in energy transfer. | [
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PMID:28760 | Redox potentials of the photosynthetic bacterial cytochromes c2 and the structural bases for variability. | The cytochromes c2 of the Rhodospirillaceae show a much greater variation in redox potential and its pH dependence than the mitochondrial cytochromes c that have been studied. It is proposed that the range of redox potential for cytochromes c2 functioning as the immediate electron donor to photo-oxidised bacteriochlorophyll may be 345-395 mV at pH 5. Closely related cytochromes c2 with different redox potentials show patterns of amino acid substitution which are consistent with changes in hydrophobicity near the haem being at least a partial determinant of redox potential. More distantly related cytochromes are difficult to compare because of the large number of amino acid substitutions and the probability that there are subtle changes in overall peptide chain folding. The redox potential versus pH curves can be analysed in terms of either one ionisation in the oxidised form or two in the oxidised form and one in the reduced. The pK in the oxidised form at higher pH values can be correlated with the pK for the disappearance or shift of the near infrared absorption band located near 695 nm. The structural bases of these ionisations are not known but the possible involvement of the haem propionate residues is discussed. | Redox potentials of the photosynthetic bacterial cytochromes c2 and the structural bases for variability. The cytochromes c2 of the Rhodospirillaceae show a much greater variation in redox potential and its pH dependence than the mitochondrial cytochromes c that have been studied. It is proposed that the range of redox potential for cytochromes c2 functioning as the immediate electron donor to photo-oxidised bacteriochlorophyll may be 345-395 mV at pH 5. Closely related cytochromes c2 with different redox potentials show patterns of amino acid substitution which are consistent with changes in hydrophobicity near the haem being at least a partial determinant of redox potential. More distantly related cytochromes are difficult to compare because of the large number of amino acid substitutions and the probability that there are subtle changes in overall peptide chain folding. The redox potential versus pH curves can be analysed in terms of either one ionisation in the oxidised form or two in the oxidised form and one in the reduced. The pK in the oxidised form at higher pH values can be correlated with the pK for the disappearance or shift of the near infrared absorption band located near 695 nm. The structural bases of these ionisations are not known but the possible involvement of the haem propionate residues is discussed. | [
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PMID:28761 | The influence of pH on the conductance of lipid bimolecular membranes in relation to the alkaline ion transport induced by carboxylic carriers grisorixin, alborixin and monensin. | The influence of the pH on the stability and stoichiometry of the complexes formed by carboxylic-antibiotics such as grisorixin, alborixin and monensin with alkaline and alkaline earth cations has been investigated. The maximum values of bimolecular lipid membrane conductance are obtained with grisorixin and potassium ion. The conductance-pH curves show a very pronounced maximum in the neutral pH range. The results are analysed on the basis of a dimeric form of the ionophore in the complex and the possibility of having several charged complexes resulting from an heterogeneous reaction, the number of each complexed form depending on the pH of the bulk solutions. | The influence of pH on the conductance of lipid bimolecular membranes in relation to the alkaline ion transport induced by carboxylic carriers grisorixin, alborixin and monensin. The influence of the pH on the stability and stoichiometry of the complexes formed by carboxylic-antibiotics such as grisorixin, alborixin and monensin with alkaline and alkaline earth cations has been investigated. The maximum values of bimolecular lipid membrane conductance are obtained with grisorixin and potassium ion. The conductance-pH curves show a very pronounced maximum in the neutral pH range. The results are analysed on the basis of a dimeric form of the ionophore in the complex and the possibility of having several charged complexes resulting from an heterogeneous reaction, the number of each complexed form depending on the pH of the bulk solutions. | [
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PMID:28763 | Purification and properties of an induced beta-D-glucosidase from stachybotrys atra. | We have purified an induced beta-D-glucosidase (beta-D-glucoside glucohydrolase, EC 3.2.1.21) from Stachybotrys atra to apparent homogeneity. The induced enzyme was clearly different from the constitutive beta-D-glucosidase. The molecular weight was 65 500-69 000, the pH optimum was at 6.7 and the isoelectric point at 4.8. Carbohydrate content (related to glucose) was 14.4%. The enzyme showed beta-D-glucosidase, beta-D-xylosidase and beta-D-thioglucosidase activity. These three activities sppear to be due to the same enzyme. The enzyme was strongly inhibited by D-glucono-(1 leads to 5)-lactone and nojirimycin and was very sensitive to sulfhydryl reagents. | Purification and properties of an induced beta-D-glucosidase from stachybotrys atra. We have purified an induced beta-D-glucosidase (beta-D-glucoside glucohydrolase, EC 3.2.1.21) from Stachybotrys atra to apparent homogeneity. The induced enzyme was clearly different from the constitutive beta-D-glucosidase. The molecular weight was 65 500-69 000, the pH optimum was at 6.7 and the isoelectric point at 4.8. Carbohydrate content (related to glucose) was 14.4%. The enzyme showed beta-D-glucosidase, beta-D-xylosidase and beta-D-thioglucosidase activity. These three activities sppear to be due to the same enzyme. The enzyme was strongly inhibited by D-glucono-(1 leads to 5)-lactone and nojirimycin and was very sensitive to sulfhydryl reagents. | [
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PMID:28765 | The two human trypsinogens: catalytic properties of the corresponding trypsins. | The catalytic properties of the two human trypsins obtained from purified trypsinogens have been studied. The catalytic rate constant kcat and the pK of the ionisable residue implicated in the active site have been determined with Bz-Arg-OEt. The hydrolysis of Tos-Arg-OMe by human trypsins does not follow the simple Michaelis-Menten scheme and indicates a difference in the conformational flexibility of the active site-regions of the two enzymes. Both enzyme are readily autolyzed and calcium ion plays a fundamental role in stabilizing trypsin activity. However trypsin 2 self-digests more rapidly than trypsin 1. These results are a prerequisite to the elucidation of the fate of pancreatic enzymes in human digestive tract. | The two human trypsinogens: catalytic properties of the corresponding trypsins. The catalytic properties of the two human trypsins obtained from purified trypsinogens have been studied. The catalytic rate constant kcat and the pK of the ionisable residue implicated in the active site have been determined with Bz-Arg-OEt. The hydrolysis of Tos-Arg-OMe by human trypsins does not follow the simple Michaelis-Menten scheme and indicates a difference in the conformational flexibility of the active site-regions of the two enzymes. Both enzyme are readily autolyzed and calcium ion plays a fundamental role in stabilizing trypsin activity. However trypsin 2 self-digests more rapidly than trypsin 1. These results are a prerequisite to the elucidation of the fate of pancreatic enzymes in human digestive tract. | [
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PMID:28766 | Purification and characterization of a myosin-cleaving protease from rat heart myofibrils. | A proteolytic enzyme, which causes the limited degradation of cardiac myosin, was purified from rat heart myofibrils. The purified enzyme (a myosin-cleaving protease) was apparently homogeneous by polyacrylamide gel electrophoresis in the presence and absence of sodium dodecyl sulfate. Autolysis of the purified enzyme was observed at neutral pH without high concentration of CaCl2. The molecular weight was estimated to be 26 000-27 000. The enzyme was active against casein, N-acetyl-L-tyrosine ethyl ester and N-glutaryl-L-phenylalanine-4-nitroanilide (Glu-Phe-NAn), but less active with N-benzoyl-DL-arginine-4-nitroanilide. Optimum pH values for the enzyme were 9.0 for casein and 8.4 for Glu-Phe-NAn. Caseinolytic activity of the enzyme was completely inhibited with phenylmethylsulfonyl fluoride and diisopropylphosphofluoride and partially inhibited with L-1-tosyl-L-phenylalanine chloromethyl ketone (Tos-PheCH2Cl) and soybean trypsin inhibitor. Tos-LysCH2Cl had no effect. Sulfhydryl reagents, metal-chelating agents and metal ions except for Zn2+ had little or no effect on the activity. Degradation of cardiac myosin with the enzyme produced two fragments having molecular weights of 130 000 and 94 000, accompanied by the disappearance of myosin heavy chain and light chain 2. Myosin degradation with the enzyme was more restrictive than with chymotrypsin. | Purification and characterization of a myosin-cleaving protease from rat heart myofibrils. A proteolytic enzyme, which causes the limited degradation of cardiac myosin, was purified from rat heart myofibrils. The purified enzyme (a myosin-cleaving protease) was apparently homogeneous by polyacrylamide gel electrophoresis in the presence and absence of sodium dodecyl sulfate. Autolysis of the purified enzyme was observed at neutral pH without high concentration of CaCl2. The molecular weight was estimated to be 26 000-27 000. The enzyme was active against casein, N-acetyl-L-tyrosine ethyl ester and N-glutaryl-L-phenylalanine-4-nitroanilide (Glu-Phe-NAn), but less active with N-benzoyl-DL-arginine-4-nitroanilide. Optimum pH values for the enzyme were 9.0 for casein and 8.4 for Glu-Phe-NAn. Caseinolytic activity of the enzyme was completely inhibited with phenylmethylsulfonyl fluoride and diisopropylphosphofluoride and partially inhibited with L-1-tosyl-L-phenylalanine chloromethyl ketone (Tos-PheCH2Cl) and soybean trypsin inhibitor. Tos-LysCH2Cl had no effect. Sulfhydryl reagents, metal-chelating agents and metal ions except for Zn2+ had little or no effect on the activity. Degradation of cardiac myosin with the enzyme produced two fragments having molecular weights of 130 000 and 94 000, accompanied by the disappearance of myosin heavy chain and light chain 2. Myosin degradation with the enzyme was more restrictive than with chymotrypsin. | [
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PMID:28767 | Purification and properties of guanylate cyclase from the synaptosomal soluble fraction of rat brain. | Guanylate cyclase (GTP pyrophosphate-lyase (cyclizing), EC 4.6.1.2) was purified 2250-fold from the synaptosomal soluble fraction of rat brain. The specific activity of the purified enzyme reached 41 nmol cyclic GMP formed per min per mg protein at 37 degrees C. In the purified preparation, GTPase activity was not detected and cyclic GMP phosphodiesterase activity was less than 4% of guanylate cyclase activity. The molecular weight was approx. 480 000. Lubrol PX, hydroxylamine, or NaN3 activated the guanylate cyclase in crude preparations, but had no effect on the purified enzyme. In contrast, NaN3 plus catalase, N-methyl-N'-nitro-N-nitrosoguanidine or sodium nitroprusside activated the purified enzyme. The purified enzyme required Mn2+ for its activity; the maximum activity was observed at 3-5 mM. Cyclic GMP activated guanylate cyclase activity 1.4-fold at 2 mM, whereas inorganic pyrophosphate inhibited it by about 50% at 0.2 mM. Guanylyl-(beta,gamma-methylene)-diphosphonate and guanylyl-imidodiphosphate, analogues of GTP, served as substrates of guanylate cyclase in the purified enzyme preparation. NaN3 plus catalase or N-methyl-N'-nitro-N-nitrosoguanidine also remarkably activated guanylate cyclase activity when the analogues of GTP were used as substrates. | Purification and properties of guanylate cyclase from the synaptosomal soluble fraction of rat brain. Guanylate cyclase (GTP pyrophosphate-lyase (cyclizing), EC 4.6.1.2) was purified 2250-fold from the synaptosomal soluble fraction of rat brain. The specific activity of the purified enzyme reached 41 nmol cyclic GMP formed per min per mg protein at 37 degrees C. In the purified preparation, GTPase activity was not detected and cyclic GMP phosphodiesterase activity was less than 4% of guanylate cyclase activity. The molecular weight was approx. 480 000. Lubrol PX, hydroxylamine, or NaN3 activated the guanylate cyclase in crude preparations, but had no effect on the purified enzyme. In contrast, NaN3 plus catalase, N-methyl-N'-nitro-N-nitrosoguanidine or sodium nitroprusside activated the purified enzyme. The purified enzyme required Mn2+ for its activity; the maximum activity was observed at 3-5 mM. Cyclic GMP activated guanylate cyclase activity 1.4-fold at 2 mM, whereas inorganic pyrophosphate inhibited it by about 50% at 0.2 mM. Guanylyl-(beta,gamma-methylene)-diphosphonate and guanylyl-imidodiphosphate, analogues of GTP, served as substrates of guanylate cyclase in the purified enzyme preparation. NaN3 plus catalase or N-methyl-N'-nitro-N-nitrosoguanidine also remarkably activated guanylate cyclase activity when the analogues of GTP were used as substrates. | [
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PMID:28768 | Immobilized hybrids of glyceraldehyde-3-phosphate dehydrogenase. | Yeast glyceraldehyde-3-phosphate dehydrogenase (glyceraldehyde-3-phosphate:NAD+ oxidoreductase (phosphorylating), EC 1.2.1.12) immobilized on CNBr-activated Sepharose 4-B has been subjected to dissociation to obtain matrix-bound dimeric species of the enzyme. Hybridization was then performed using soluble glyceraldehyde-3-phosphate dehydrogenase isolated from rat skeletal muscle. Immobilized hybrid tetramers thus obtained were demonstrated to exhibit two distinct pH-optima of activity characteristic of the yeast and muscle enzymes, respectively. The results indicate that under appropriate conditions the activity of each of the dimers composing the immobilized hybrid tetramer can be studied separately. | Immobilized hybrids of glyceraldehyde-3-phosphate dehydrogenase. Yeast glyceraldehyde-3-phosphate dehydrogenase (glyceraldehyde-3-phosphate:NAD+ oxidoreductase (phosphorylating), EC 1.2.1.12) immobilized on CNBr-activated Sepharose 4-B has been subjected to dissociation to obtain matrix-bound dimeric species of the enzyme. Hybridization was then performed using soluble glyceraldehyde-3-phosphate dehydrogenase isolated from rat skeletal muscle. Immobilized hybrid tetramers thus obtained were demonstrated to exhibit two distinct pH-optima of activity characteristic of the yeast and muscle enzymes, respectively. The results indicate that under appropriate conditions the activity of each of the dimers composing the immobilized hybrid tetramer can be studied separately. | [
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PMID:28770 | The kinetics of methyl viologen oxidation and reduction by the hydrogenase from Clostridium pasteurianum. | A mechanism for the reduction and oxidation of methyl viologen by Clostridium pasteurianum hydrogenase (hydrogen:ferredoxin oxidoreductase, EC 1.12.7.1) is proposed. Double reciprocal plots for methyl viologen reduction and oxidation at pH values 7.0-9.85 are linear, and the plots for reduction and oxidation are intersecting. Such data are consistent with a mechanism in which the H2 and one methyl viologen bind (either in order or randomly) with subsequent reduction and release of the methyl viologen. A second methyl viologen then is bound, reduced and released. Comparison of the calculated Keq' with the Haldane expression in which both methyl viologens react at the same rate show a large difference. This difference indicates that the two methyl viologens react at different rates. Addition of oxidized electron carriers inhibits the hydrogen-deuterium exchange reaction (i.e., the exchange of protons between H2 and 2H2O). CO reversibly inhibits methyl viologen reduction and is competitive vs. H2. O2 acts as an irreversible inhibitor. | The kinetics of methyl viologen oxidation and reduction by the hydrogenase from Clostridium pasteurianum. A mechanism for the reduction and oxidation of methyl viologen by Clostridium pasteurianum hydrogenase (hydrogen:ferredoxin oxidoreductase, EC 1.12.7.1) is proposed. Double reciprocal plots for methyl viologen reduction and oxidation at pH values 7.0-9.85 are linear, and the plots for reduction and oxidation are intersecting. Such data are consistent with a mechanism in which the H2 and one methyl viologen bind (either in order or randomly) with subsequent reduction and release of the methyl viologen. A second methyl viologen then is bound, reduced and released. Comparison of the calculated Keq' with the Haldane expression in which both methyl viologens react at the same rate show a large difference. This difference indicates that the two methyl viologens react at different rates. Addition of oxidized electron carriers inhibits the hydrogen-deuterium exchange reaction (i.e., the exchange of protons between H2 and 2H2O). CO reversibly inhibits methyl viologen reduction and is competitive vs. H2. O2 acts as an irreversible inhibitor. | [
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PMID:28771 | Esterase XXVII. Purification and characterization of esterase-9A of mouse kidney. | Esterase-9A, which appears electrophoretically as a triplet of the bands III-50, III-40 and III-30, was isolated from the kidneys of male NMRI-mice by isoelectrofocusing and refocusing followed by repeated molecular sieve chromography. The overall purification was approx. 250 fold and each of the three bands was isolated separately. The band of the triplet nearest to the cathode, III-50, changed in vitro into the satellite bands III-40 and III-30 and, further, into the band III-22 not observed before in the homogenate. It is assumed that the band III-50 represents the original gene product. The molecular weight (45 000) of the band III-50 is identical with those of III-40 and III-30, as measured by analytical electrophoresis, whereas the molecular weight obtained by thin-layer chromatography was 51 000. There were no obvious signs that esterase-9 was composed of subunits. The Km constant for 4-nitrophenyl proprionate was identical for each of three bands. The esterase-9A is the first testosterone-dependent isozyme of the mouse carboxylesterase (carboxylicester hydrolase, EC 3.1.1.1) system which has been isolated. | Esterase XXVII. Purification and characterization of esterase-9A of mouse kidney. Esterase-9A, which appears electrophoretically as a triplet of the bands III-50, III-40 and III-30, was isolated from the kidneys of male NMRI-mice by isoelectrofocusing and refocusing followed by repeated molecular sieve chromography. The overall purification was approx. 250 fold and each of the three bands was isolated separately. The band of the triplet nearest to the cathode, III-50, changed in vitro into the satellite bands III-40 and III-30 and, further, into the band III-22 not observed before in the homogenate. It is assumed that the band III-50 represents the original gene product. The molecular weight (45 000) of the band III-50 is identical with those of III-40 and III-30, as measured by analytical electrophoresis, whereas the molecular weight obtained by thin-layer chromatography was 51 000. There were no obvious signs that esterase-9 was composed of subunits. The Km constant for 4-nitrophenyl proprionate was identical for each of three bands. The esterase-9A is the first testosterone-dependent isozyme of the mouse carboxylesterase (carboxylicester hydrolase, EC 3.1.1.1) system which has been isolated. | [
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PMID:28772 | Characterization of sterol-ester hydrolase in Saccharomyces cerevisiae. | A homgenate of Saccharomyces cerevisiae grown under semi-anaerobic as well as aerobic conditions was found to catalyze the hydrolysis of fatty acid esters of sterols in the presence of Triton X-100. The enzyme levels in cells grown under various conditions were similar and the enzyme had a broad substrate specificity for sterol esters. The enzyme was localized in the mitochondrial fraction for the aerobically grown cells and in the mitochondrial and cytosolic fractions for the semi-anaerobically grown cells. | Characterization of sterol-ester hydrolase in Saccharomyces cerevisiae. A homgenate of Saccharomyces cerevisiae grown under semi-anaerobic as well as aerobic conditions was found to catalyze the hydrolysis of fatty acid esters of sterols in the presence of Triton X-100. The enzyme levels in cells grown under various conditions were similar and the enzyme had a broad substrate specificity for sterol esters. The enzyme was localized in the mitochondrial fraction for the aerobically grown cells and in the mitochondrial and cytosolic fractions for the semi-anaerobically grown cells. | [
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PMID:28773 | Temperature and pH effects with immobilized electric eel acetylcholinesterase. | Kinetic studies were made with 2 forms of immobilized acetylcholinesterase: enzyme trapped in polyacrylamide gel which was cut into slices; and enzyme attached to the inner surface of nylon tubing. Rates were measured at substrate concentrations which were low and high with reference to the Michaelis constant, and over the temperature range 16-40 degrees C. Low activation energies (1.7-2.7 kcal mol-1) were obtained at low substrate concentrations, indicating diffusion control. At high substrate concentrations the Arrhenius plots were non-linear and the activation energies substantially higher, and there is less diffusion control. With enzyme-polyacrylamide slices, there was a continuous increase in rate with increasing pH, in contrast to the bell-shaped behavior with free enzyme. A theoretical treatment suggests that this is due to the lowering of local pH as a result of the acid released in the hydrolysis. | Temperature and pH effects with immobilized electric eel acetylcholinesterase. Kinetic studies were made with 2 forms of immobilized acetylcholinesterase: enzyme trapped in polyacrylamide gel which was cut into slices; and enzyme attached to the inner surface of nylon tubing. Rates were measured at substrate concentrations which were low and high with reference to the Michaelis constant, and over the temperature range 16-40 degrees C. Low activation energies (1.7-2.7 kcal mol-1) were obtained at low substrate concentrations, indicating diffusion control. At high substrate concentrations the Arrhenius plots were non-linear and the activation energies substantially higher, and there is less diffusion control. With enzyme-polyacrylamide slices, there was a continuous increase in rate with increasing pH, in contrast to the bell-shaped behavior with free enzyme. A theoretical treatment suggests that this is due to the lowering of local pH as a result of the acid released in the hydrolysis. | [
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PMID:28774 | Enzyme behaviour and molecular environment. The effects of ionic strength, detergents, linear polyanions and phospholipids on the pH profile of soluble cytochrome oxidase. | The activity vs. pH profile for the oxidation of ferrocytochrome c by purified cytochrome oxidase (ferrocytochrome c:oxygen oxidoreductase, EC 1.9.3.1) was investigated as a function of ionic strength (from 10 to 200 mM) in the absence and in the presence of various perturbants: Tween 20, linear polyanions (RNA, heparin, polyglutamic acid) and phospholipids (asolectin, phosphatidylcholine, phosphatidic acid and cardiolipin). The activation induced by Tween 20 and "zero net charge" phospholipid liposomes was not pH dependent. On the other hand, linear polyanions and polyanionic liposomes strongly perturbed the pH profile, mostly at low ionic strength, by shifting the pH optimum about 1.7 pH units towards alkaline pH values. This effect was reversed by increasing ionic strength. These observations are interpreted in the light of polyelectrolyte theory. Since these results show striking with membrane-bound enzyme, it is concluded that in vivo cytochrome oxidase is located within polyanionic sites of the micochondrial membrane. The activation broght about by phospholipids may result from two posible processes: creation of a hydrophobic environment by the non-polar tails, preventing autoaggregation; and creation of a suitable polyelectrolytic environment by the polar heads (of non zero net charge), increasing the intrinsic reaction rate. | Enzyme behaviour and molecular environment. The effects of ionic strength, detergents, linear polyanions and phospholipids on the pH profile of soluble cytochrome oxidase. The activity vs. pH profile for the oxidation of ferrocytochrome c by purified cytochrome oxidase (ferrocytochrome c:oxygen oxidoreductase, EC 1.9.3.1) was investigated as a function of ionic strength (from 10 to 200 mM) in the absence and in the presence of various perturbants: Tween 20, linear polyanions (RNA, heparin, polyglutamic acid) and phospholipids (asolectin, phosphatidylcholine, phosphatidic acid and cardiolipin). The activation induced by Tween 20 and "zero net charge" phospholipid liposomes was not pH dependent. On the other hand, linear polyanions and polyanionic liposomes strongly perturbed the pH profile, mostly at low ionic strength, by shifting the pH optimum about 1.7 pH units towards alkaline pH values. This effect was reversed by increasing ionic strength. These observations are interpreted in the light of polyelectrolyte theory. Since these results show striking with membrane-bound enzyme, it is concluded that in vivo cytochrome oxidase is located within polyanionic sites of the micochondrial membrane. The activation broght about by phospholipids may result from two posible processes: creation of a hydrophobic environment by the non-polar tails, preventing autoaggregation; and creation of a suitable polyelectrolytic environment by the polar heads (of non zero net charge), increasing the intrinsic reaction rate. | [
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PMID:28775 | Zinc stoichiometry in Escherichia coli alkaline phosphatase. Studies by 31P NMR and ion-exchange chromatography. | 31P nuclear magnetic resonance spectra and enzymatic activities are compared for alkaline phosphatase (orthophosphoric-monoester phosphohydrolase (alkaline optimum), EC 3.1.3.1) species with different zinc contents. The enzyme containing two Zn2+ per protein dimer exists in two forms; one, prepared by dialysis of native enzyme, has full enzymatic activity and a 31P magnetic resonance spectrum similar to but distinguishable from that of the native enzyme containing four or more Zn2+. The other form, prepared by restoring two Zn2+ to apoenzyme, has low enzymatic activity and a 31P magnetic resonance spectrum that indicates stoichiometric binding of phosphate, but otherwise altered properties. Reconstituted enzyme with four Zn2+ is similar to but distinguishable from native enzyme with four Zn2+. Chromatography on DEAE-cellulose can separate apoenzyme and enzyme containing two Zn2+ and suggests that the binding of a pair of Zn2+ is cooperative. | Zinc stoichiometry in Escherichia coli alkaline phosphatase. Studies by 31P NMR and ion-exchange chromatography. 31P nuclear magnetic resonance spectra and enzymatic activities are compared for alkaline phosphatase (orthophosphoric-monoester phosphohydrolase (alkaline optimum), EC 3.1.3.1) species with different zinc contents. The enzyme containing two Zn2+ per protein dimer exists in two forms; one, prepared by dialysis of native enzyme, has full enzymatic activity and a 31P magnetic resonance spectrum similar to but distinguishable from that of the native enzyme containing four or more Zn2+. The other form, prepared by restoring two Zn2+ to apoenzyme, has low enzymatic activity and a 31P magnetic resonance spectrum that indicates stoichiometric binding of phosphate, but otherwise altered properties. Reconstituted enzyme with four Zn2+ is similar to but distinguishable from native enzyme with four Zn2+. Chromatography on DEAE-cellulose can separate apoenzyme and enzyme containing two Zn2+ and suggests that the binding of a pair of Zn2+ is cooperative. | [
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PMID:28776 | NMR and enzymatic investigation of the interaction between elastase and sodium trifluoroacetate. | At pH 5.5, sodium trifluoroacetate is a potent competitive inhibitor of porcine elastase (Ki = 2.6 mM) and human leukocyte elastase (Ki = 9.3 mM). For both enzymes the Ki increases strongly with pH. Sodium fluoride is inactive on pancreatic elastase and sodium acetate is a weak inhibitor of this enzyme. Trifluoroethanol inhibits both enzymes but is less active than trifluoroacetate in acidic pH conditions. Bovine trypsin and alpha-chymotrypsin are resistant to the action of sodium trifluoroacetate and trifluoroethanol. The interaction between sodium trifluoroacetate and pancreatic elastase is also demonstrated by 19F NMR spectroscopy. Trifluoroacetyltrialanine is able to displace trifluoroacetate from its complex with pancreatic elastase. In addition, a method using turkey ovomucoid for the active site titration of leukocyte and pancreatic elastase is described. | NMR and enzymatic investigation of the interaction between elastase and sodium trifluoroacetate. At pH 5.5, sodium trifluoroacetate is a potent competitive inhibitor of porcine elastase (Ki = 2.6 mM) and human leukocyte elastase (Ki = 9.3 mM). For both enzymes the Ki increases strongly with pH. Sodium fluoride is inactive on pancreatic elastase and sodium acetate is a weak inhibitor of this enzyme. Trifluoroethanol inhibits both enzymes but is less active than trifluoroacetate in acidic pH conditions. Bovine trypsin and alpha-chymotrypsin are resistant to the action of sodium trifluoroacetate and trifluoroethanol. The interaction between sodium trifluoroacetate and pancreatic elastase is also demonstrated by 19F NMR spectroscopy. Trifluoroacetyltrialanine is able to displace trifluoroacetate from its complex with pancreatic elastase. In addition, a method using turkey ovomucoid for the active site titration of leukocyte and pancreatic elastase is described. | [
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PMID:28777 | Purification and properties of pig brain guanine deaminase. | Guanine deaminase (guanine aminohydrolase, EC 3.5.4.3) from pig brain was purified to homogeneity by column chromatography and ammonium sulphate fractionation. Homogeneity was established by polyacrylamide gel electrophoresis in the presence and absence of sodium dodecyl sulphate (SDS). The molecular weight of 110 000 was determined by gel filtration and sucrose density gradient centrifugation. SDS polyacrylamide gel electrophoresis indicated subunits of a molecular weight of 50 000. The amino acid composition, the isoelectric point and the number of -SH groups were determined. 5.5'-Dithiobis-(2-nitrobenzoic acid) reacts with about seven -SH groups in the native enzyme, but upon denaturation with SDS, 10 -SH groups react with this former reagent. Using electrolytic reduction, 44 half-cystines were determined in accordance with the number of cysteic acid residues determined by amino acid analysis after performic acid oxidation. The Km values determined for substrates of the enzyme were 1.1 . 10(-5) M for guanine in 0.1 M Tris. HCl buffer (pH 8.0) and 3.3 . 10(-4) M for 8-azaguanine in 0.1 M phosphate buffer, pH 6.4. The pKa values determined for ionizable groups of the active site of the enzyme were near pH 6.2 and pH 8.2. The chemical and kinetic evidence suggests that cysteine and histidine may be essential for the catalysis. | Purification and properties of pig brain guanine deaminase. Guanine deaminase (guanine aminohydrolase, EC 3.5.4.3) from pig brain was purified to homogeneity by column chromatography and ammonium sulphate fractionation. Homogeneity was established by polyacrylamide gel electrophoresis in the presence and absence of sodium dodecyl sulphate (SDS). The molecular weight of 110 000 was determined by gel filtration and sucrose density gradient centrifugation. SDS polyacrylamide gel electrophoresis indicated subunits of a molecular weight of 50 000. The amino acid composition, the isoelectric point and the number of -SH groups were determined. 5.5'-Dithiobis-(2-nitrobenzoic acid) reacts with about seven -SH groups in the native enzyme, but upon denaturation with SDS, 10 -SH groups react with this former reagent. Using electrolytic reduction, 44 half-cystines were determined in accordance with the number of cysteic acid residues determined by amino acid analysis after performic acid oxidation. The Km values determined for substrates of the enzyme were 1.1 . 10(-5) M for guanine in 0.1 M Tris. HCl buffer (pH 8.0) and 3.3 . 10(-4) M for 8-azaguanine in 0.1 M phosphate buffer, pH 6.4. The pKa values determined for ionizable groups of the active site of the enzyme were near pH 6.2 and pH 8.2. The chemical and kinetic evidence suggests that cysteine and histidine may be essential for the catalysis. | [
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PMID:28778 | [Purification and detection of multiple forms of histidine decarboxylase in rat gastric mucosa (author's transl)]. | A specific histidine decarboxylase from rat gastric mucosa has been obtained at high purity and good yield (purification about 600-fold). The purification procedure included double (NH4)2SO4 fractionation, ion-exchange chromatography, preparative isoelectric focusing in a granulated gel and gel filtration. Only the specific histidine enzyme was obtained by that procedure; DOPA decarboxylase, a non-specific enzyme, was absent in our final preparation. Each step of the purification was visualized by polyacrylamide gel electrophoresis and analytical isoelectric focusing. The purified enzyme was apparently homogenous by criteria of electrophoresis and gel filtration and has a molecular weight of 94 000. Several protein bands appeared after isoelectric focusing and the enzyme activity was localized in 3 distinct peaks. The gastric enzyme consists of 3 active forms which could be distinguished by their isoelectric points: 5.4, 5.75 and 6. Moleculare weights estimated by SDS polyacrylamide gel electrophoresis were 97 000, 93 000 and 90 000, and no subunits were observed. Pyridoxal phosphate was required as a coenzyme and resolution of the holoenzyme agreed with a portion of the coenzyme tightly bound to the apoenzyme. The purified enzyme was stable at low ionic strength, near neutral pH; concentrated reducing agents inhibit the enzyme. | [Purification and detection of multiple forms of histidine decarboxylase in rat gastric mucosa (author's transl)]. A specific histidine decarboxylase from rat gastric mucosa has been obtained at high purity and good yield (purification about 600-fold). The purification procedure included double (NH4)2SO4 fractionation, ion-exchange chromatography, preparative isoelectric focusing in a granulated gel and gel filtration. Only the specific histidine enzyme was obtained by that procedure; DOPA decarboxylase, a non-specific enzyme, was absent in our final preparation. Each step of the purification was visualized by polyacrylamide gel electrophoresis and analytical isoelectric focusing. The purified enzyme was apparently homogenous by criteria of electrophoresis and gel filtration and has a molecular weight of 94 000. Several protein bands appeared after isoelectric focusing and the enzyme activity was localized in 3 distinct peaks. The gastric enzyme consists of 3 active forms which could be distinguished by their isoelectric points: 5.4, 5.75 and 6. Moleculare weights estimated by SDS polyacrylamide gel electrophoresis were 97 000, 93 000 and 90 000, and no subunits were observed. Pyridoxal phosphate was required as a coenzyme and resolution of the holoenzyme agreed with a portion of the coenzyme tightly bound to the apoenzyme. The purified enzyme was stable at low ionic strength, near neutral pH; concentrated reducing agents inhibit the enzyme. | [
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PMID:28779 | Hydrogen bonding of flavoprotein. I. Effect of hydrogen bonding on electronic spectra of flavoprotein. | The effect of hydrogen bonding on the transition energy and the oscillator strength of the isoalloxazine nucleus of flavins was studied by the molecular orbital method. Among the possible hydrogen bondings examined, characteristic spectral shifts were found for the hydrogen bondings at N(1) and N(5) of the nucleus. The hydrogen bonding at N(1) resulted in the shift of the first absorption band towards blue and that of the second one towards red. On the other hand, the hydrogen bonding at N(5) resulted in the shifts of both the first and the second band towards red. The spectral characteristics reported on Clostridium MP and Desulfovibrio vulgaris flavodoxin coincided with the calculated results. The application of the calculated results to D-amino acid oxidase (D-amino acid: oxygen oxidoreductase (deaminating), EC 1.4.3.3) led to the conclusion that hydrogen bonding occurs at O(12), N(3)H, O(14) and N(5) of the isoalloxazine nucleus. The occurrence of hydrogen bondings at O(12), N(3)H, and O(14) is favorable for N(5) of the isoalloxazine nucleus to accept electron from an electron donor. | Hydrogen bonding of flavoprotein. I. Effect of hydrogen bonding on electronic spectra of flavoprotein. The effect of hydrogen bonding on the transition energy and the oscillator strength of the isoalloxazine nucleus of flavins was studied by the molecular orbital method. Among the possible hydrogen bondings examined, characteristic spectral shifts were found for the hydrogen bondings at N(1) and N(5) of the nucleus. The hydrogen bonding at N(1) resulted in the shift of the first absorption band towards blue and that of the second one towards red. On the other hand, the hydrogen bonding at N(5) resulted in the shifts of both the first and the second band towards red. The spectral characteristics reported on Clostridium MP and Desulfovibrio vulgaris flavodoxin coincided with the calculated results. The application of the calculated results to D-amino acid oxidase (D-amino acid: oxygen oxidoreductase (deaminating), EC 1.4.3.3) led to the conclusion that hydrogen bonding occurs at O(12), N(3)H, O(14) and N(5) of the isoalloxazine nucleus. The occurrence of hydrogen bondings at O(12), N(3)H, and O(14) is favorable for N(5) of the isoalloxazine nucleus to accept electron from an electron donor. | [
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PMID:28780 | Soluble NADH-cytochrome b5 reductase from rabbit liver cytosol: partial purification and characterization. | A soluble form of NADH-cytochrome b5 reductase (NADH: ferricytochrome b5 oxidoreductase, EC 1.6.2.2) was found in the cytosolic fraction of rabbit liver. The partially purified enzyme was strictly specific for NADH. It catalyzed the reduction of several substrates such as the methemoglobin-ferrocyanide complex (Hegesh, E. and Avron, M. (1967) Biochim. Biophys. Acta 146, 91-101) (apparent Km: 8 micrometer), potassium ferricyanide (apparent Km: 10 micrometer) and ferricytochrome b5 (apparent Km: 15 micrometer). Upon acrylamide gel isoelectro-focusing followed by specific staining, the enzyme was resolved into four bands (isoelectric pH: 7.05, 6.70, 6.50 and 6.30). The optimum pH of activity with ferricytochrome b5 as a substrate was 6.5. The estimated molecular weight was 25 000--30 000. The enzyme was unsensitive to cyanide. It was strongly inhibited by p-hydroxymercuribenzoate. The cytosolic liver cytochrome b5 reductase was immunologically related to the soluble cytochrome b5 reductase from human and rabbit red-cells, and to the microsomal cytochrome b5 reductase from rabbit liver. | Soluble NADH-cytochrome b5 reductase from rabbit liver cytosol: partial purification and characterization. A soluble form of NADH-cytochrome b5 reductase (NADH: ferricytochrome b5 oxidoreductase, EC 1.6.2.2) was found in the cytosolic fraction of rabbit liver. The partially purified enzyme was strictly specific for NADH. It catalyzed the reduction of several substrates such as the methemoglobin-ferrocyanide complex (Hegesh, E. and Avron, M. (1967) Biochim. Biophys. Acta 146, 91-101) (apparent Km: 8 micrometer), potassium ferricyanide (apparent Km: 10 micrometer) and ferricytochrome b5 (apparent Km: 15 micrometer). Upon acrylamide gel isoelectro-focusing followed by specific staining, the enzyme was resolved into four bands (isoelectric pH: 7.05, 6.70, 6.50 and 6.30). The optimum pH of activity with ferricytochrome b5 as a substrate was 6.5. The estimated molecular weight was 25 000--30 000. The enzyme was unsensitive to cyanide. It was strongly inhibited by p-hydroxymercuribenzoate. The cytosolic liver cytochrome b5 reductase was immunologically related to the soluble cytochrome b5 reductase from human and rabbit red-cells, and to the microsomal cytochrome b5 reductase from rabbit liver. | [
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PMID:28781 | Purification and properties of rat liver mitochondrial glutathione peroxidase. | Glutathione peroxidase (glutathione:hydrogen peroxide oxidoreductase, EC 1.11.1.9) was purified from rat liver mitochondria. The enzyme was shown to be pure by polyacrylamide-gel electrophoresis and to contain multiple forms that differed in charge. Selenium was specifically associated with the enzyme. The enzyme was inhibited by iodoacetic acid and iodoacetamide in an unusual pattern of reduction by sulfhydryl compounds and pH dependency. The mitochondrial and cytoplasmic forms of the enzyme were compared, and an explanation of the inhibition patterns is offered. | Purification and properties of rat liver mitochondrial glutathione peroxidase. Glutathione peroxidase (glutathione:hydrogen peroxide oxidoreductase, EC 1.11.1.9) was purified from rat liver mitochondria. The enzyme was shown to be pure by polyacrylamide-gel electrophoresis and to contain multiple forms that differed in charge. Selenium was specifically associated with the enzyme. The enzyme was inhibited by iodoacetic acid and iodoacetamide in an unusual pattern of reduction by sulfhydryl compounds and pH dependency. The mitochondrial and cytoplasmic forms of the enzyme were compared, and an explanation of the inhibition patterns is offered. | [
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PMID:28782 | N-Acetyltransferase activity of the rat Harderian gland. | Harderian gland extracts from male rats catalyze the conversion of serotonin to N-acetylserotonin and of tryptamine to N-acetyltryptamine. The reaction is linear up to 14 mg tissue and departs from linearity after 10 min. The pH otpimum with tryptamine as substrate is between 8 and 9. Enzymic activity of the gland in vivo does not show diurnal variations. Enzymic activity of tissue in organ culture is not stimulated by 10 micrometer isoproterenol or 100 micrometer dibutyryl cyclic AMP. Harderian gland tissue in culture can acetylate tryptamine and serotonin and can O-methylate the N-acetylserotonin to form melatonin. | N-Acetyltransferase activity of the rat Harderian gland. Harderian gland extracts from male rats catalyze the conversion of serotonin to N-acetylserotonin and of tryptamine to N-acetyltryptamine. The reaction is linear up to 14 mg tissue and departs from linearity after 10 min. The pH otpimum with tryptamine as substrate is between 8 and 9. Enzymic activity of the gland in vivo does not show diurnal variations. Enzymic activity of tissue in organ culture is not stimulated by 10 micrometer isoproterenol or 100 micrometer dibutyryl cyclic AMP. Harderian gland tissue in culture can acetylate tryptamine and serotonin and can O-methylate the N-acetylserotonin to form melatonin. | [
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PMID:28783 | Cholesteryl ester and triglyceride hydrolysis by an acid lipase from rabbit aorta. | The properties of the triglyceride- and cholesteryl ester-hydrolyzing activity by an acid lipase from rabbit aortic tissue were compared under different experimental conditions. Radiolabeled cholesteryl oleate or triolein was incorporated into phospholipid vesicles by sonication and the resulting preparations were used for in vitro studies. No distinction was observed between triglyceride lipase and cholesterol esterase activity in the aortic cytosol fraction following either thermal inactivation, inhibition by a mercurial, fractionation by ammonium sulfate or acid precipitation, or DEAE-cellulose chromatography. Addition of rabbit lipoproteins to the assay system resulted in inhibition of both cholesterol esterase and triglyceride lipase activity. Parallel changes in the hydrolysis of both substrates also were observed when exogenously added lipids were added to the incubation system in various physical states. Specificities of the enzyme system towards different cholesteryl esters were examined. No differences in the rate of hydrolysis were observed between cholesteryl oleate, palmitate and linoleate. The data suggest that a single acid lipase, presumably of lysosomal origin, has broad specificity towards triglycerides and cholesteryl esters, and may play a role in the hydrolysis of these lipids during intralysosomal degradation of lipoproteins. | Cholesteryl ester and triglyceride hydrolysis by an acid lipase from rabbit aorta. The properties of the triglyceride- and cholesteryl ester-hydrolyzing activity by an acid lipase from rabbit aortic tissue were compared under different experimental conditions. Radiolabeled cholesteryl oleate or triolein was incorporated into phospholipid vesicles by sonication and the resulting preparations were used for in vitro studies. No distinction was observed between triglyceride lipase and cholesterol esterase activity in the aortic cytosol fraction following either thermal inactivation, inhibition by a mercurial, fractionation by ammonium sulfate or acid precipitation, or DEAE-cellulose chromatography. Addition of rabbit lipoproteins to the assay system resulted in inhibition of both cholesterol esterase and triglyceride lipase activity. Parallel changes in the hydrolysis of both substrates also were observed when exogenously added lipids were added to the incubation system in various physical states. Specificities of the enzyme system towards different cholesteryl esters were examined. No differences in the rate of hydrolysis were observed between cholesteryl oleate, palmitate and linoleate. The data suggest that a single acid lipase, presumably of lysosomal origin, has broad specificity towards triglycerides and cholesteryl esters, and may play a role in the hydrolysis of these lipids during intralysosomal degradation of lipoproteins. | [
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PMID:28784 | A protease-like permeability factor in the guinea pig skin. 2. In vitro activation of the latent form permeability factor by weakly acidic phosphate buffer. | Conditions for the in vitro activation of the latent form of a protease-like permeability factor in the pseudoglobulin fraction from guinea pig skin were examined. (1) The factor was activated by dialysis against 67 mM phosphate buffer at pH 5.8--6.4, not at pH 7.0--8.0. (2) High salt concentration (200 mM or greater phosphate buffer or 67 mM phosphate buffer containing 200 mM or greater KCl or NaCl) prevented the activation at pH 6.2. (3) High osmotic pressure (sucrose at 1 M) did not affect activation at pH 6.2. (4) Reconversion of the activated permeability factor into an inactive form was not observed under high salt conditions, under which the latent permeability factor was stable in its own form. (5) The molecular size of the latent permeability factor was estimated as approx. 80 000 by Sephadex G-100 gel filtration at high salt concentration. | A protease-like permeability factor in the guinea pig skin. 2. In vitro activation of the latent form permeability factor by weakly acidic phosphate buffer. Conditions for the in vitro activation of the latent form of a protease-like permeability factor in the pseudoglobulin fraction from guinea pig skin were examined. (1) The factor was activated by dialysis against 67 mM phosphate buffer at pH 5.8--6.4, not at pH 7.0--8.0. (2) High salt concentration (200 mM or greater phosphate buffer or 67 mM phosphate buffer containing 200 mM or greater KCl or NaCl) prevented the activation at pH 6.2. (3) High osmotic pressure (sucrose at 1 M) did not affect activation at pH 6.2. (4) Reconversion of the activated permeability factor into an inactive form was not observed under high salt conditions, under which the latent permeability factor was stable in its own form. (5) The molecular size of the latent permeability factor was estimated as approx. 80 000 by Sephadex G-100 gel filtration at high salt concentration. | [
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PMID:28785 | Aggregation of ampholine on heparin and other acidic polysaccharides in isoelectric focusing. | The mechanism of complexation of pI range 3.5--5 Ampholine to heparin in isoelectric focusing has been explored by the dye-binding technique at different pH values in solution. There is no significant interaction between heparin and Ampholine at pH 6.7. Weak, or selective, binding occurs at pH 5.1, and very strong interaction at pH 3.5. In the latter system, the Ampholine components appear to behave as polycations due to their ordered sequence of positive charges, each two methylene groups apart, which favors a strong binding to polyanions. In addition, there appear to be variable stoichiometries for the strong binding between heparin and Ampholine, depending on their relative amounts. It is proposed that at a low ratio of heparin to Ampholine (Ampholine excess), aggregation is perpendicular to the heparin chain, with the end ammonium charge of each Ampholine molecule neutralizing one negative charge along the heparin molecule; at higher ratios (heparin excess), the bound Ampholine segment is aligned parallel to the heparin molecule, so that on the average one Ampholine component neutralizes approx. three negative charges. The banding of heparin in isoelectric focusing in the pH range 3.0--4.5 can be explained by aggregation of the various components on heparin in amounts dependent upon the net charge on the Ampholine species at the given pH, and upon the changing stoichiometries as a function of the variation in ratio of heparin to Ampholine along the pH gradient. Binding of Ampholine to polygalacturonate was also demonstrated in excess Ampholine in a pH range dependent on the degree of protonation of the carboxyl groups of this acidic polysaccharide as well as on the net positive charge of the Ampholine. The aggregation seen at pH 4.2--4.5 led to the prediction and subsequent demonstration that polygalacturonate would also exhibit binding upon isoelectric focusing. This supports the hypothesis that aggregation of Ampholine on polyanions having sufficient charge density is a general phenomenon which can lead to spurious banding of certain polymers at appropriate pH ranges in isoelectric focusing. On the basis of their behavior in isoelectric focusing at pH 3.0--4.5, strength of aggregation of the polyanions studied appears to be heparin A = heparin B greather than polyglutamate greater than carboxyl-reduced heparin B greater than polygalacturonic acid. | Aggregation of ampholine on heparin and other acidic polysaccharides in isoelectric focusing. The mechanism of complexation of pI range 3.5--5 Ampholine to heparin in isoelectric focusing has been explored by the dye-binding technique at different pH values in solution. There is no significant interaction between heparin and Ampholine at pH 6.7. Weak, or selective, binding occurs at pH 5.1, and very strong interaction at pH 3.5. In the latter system, the Ampholine components appear to behave as polycations due to their ordered sequence of positive charges, each two methylene groups apart, which favors a strong binding to polyanions. In addition, there appear to be variable stoichiometries for the strong binding between heparin and Ampholine, depending on their relative amounts. It is proposed that at a low ratio of heparin to Ampholine (Ampholine excess), aggregation is perpendicular to the heparin chain, with the end ammonium charge of each Ampholine molecule neutralizing one negative charge along the heparin molecule; at higher ratios (heparin excess), the bound Ampholine segment is aligned parallel to the heparin molecule, so that on the average one Ampholine component neutralizes approx. three negative charges. The banding of heparin in isoelectric focusing in the pH range 3.0--4.5 can be explained by aggregation of the various components on heparin in amounts dependent upon the net charge on the Ampholine species at the given pH, and upon the changing stoichiometries as a function of the variation in ratio of heparin to Ampholine along the pH gradient. Binding of Ampholine to polygalacturonate was also demonstrated in excess Ampholine in a pH range dependent on the degree of protonation of the carboxyl groups of this acidic polysaccharide as well as on the net positive charge of the Ampholine. The aggregation seen at pH 4.2--4.5 led to the prediction and subsequent demonstration that polygalacturonate would also exhibit binding upon isoelectric focusing. This supports the hypothesis that aggregation of Ampholine on polyanions having sufficient charge density is a general phenomenon which can lead to spurious banding of certain polymers at appropriate pH ranges in isoelectric focusing. On the basis of their behavior in isoelectric focusing at pH 3.0--4.5, strength of aggregation of the polyanions studied appears to be heparin A = heparin B greather than polyglutamate greater than carboxyl-reduced heparin B greater than polygalacturonic acid. | [
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PMID:28786 | Selective polyamine-binding proteins. Spermine binding by an androgen-sensitive phosphoprotein. | Rat ventral prostate contains an acidic protein which can bind spermine selectively. The relative binding affinities of various aliphatic amines for the protein are, in decreasing order, spermine greater than thermine greater than greater than putrecine greater than 1,10-diaminodecane, cadaverine and 1,12-diaminododecane. The binding protein has an isoelectric point at pH 4.3 and a sedimentation coefficient of 3 S. Its molecular weight is approx. 30 000. Histones and nuclear chromatin preparations of the prostate can interact with the binding protein. The spermine-binding activity of the purified prostate protein can be inactivated by treatment with intestinal alkaline phosphatases. The phosphatase treated preparation can then be reactivated by beef heart protein kinase in the presence of cyclic AMP and ATP. The spermine-binding activity of the prostate cytosol protein fraction decreases after castration, but increases very rapidly after the castrated rats are injected with 5alpha-dihydrotestosterone. This finding raises the possibility that, in the postate, certain androgen actions may be dependent on the androgen-induced increase in the acidic protein binding of polyamines and their translocation to a functional cellular site such as nuclear chromatin. In the prostate cytosol, spermine also binds to 4-S tRNAs and to a unique RNA which has a sedimentation coefficient of 1.5 S. | Selective polyamine-binding proteins. Spermine binding by an androgen-sensitive phosphoprotein. Rat ventral prostate contains an acidic protein which can bind spermine selectively. The relative binding affinities of various aliphatic amines for the protein are, in decreasing order, spermine greater than thermine greater than greater than putrecine greater than 1,10-diaminodecane, cadaverine and 1,12-diaminododecane. The binding protein has an isoelectric point at pH 4.3 and a sedimentation coefficient of 3 S. Its molecular weight is approx. 30 000. Histones and nuclear chromatin preparations of the prostate can interact with the binding protein. The spermine-binding activity of the purified prostate protein can be inactivated by treatment with intestinal alkaline phosphatases. The phosphatase treated preparation can then be reactivated by beef heart protein kinase in the presence of cyclic AMP and ATP. The spermine-binding activity of the prostate cytosol protein fraction decreases after castration, but increases very rapidly after the castrated rats are injected with 5alpha-dihydrotestosterone. This finding raises the possibility that, in the postate, certain androgen actions may be dependent on the androgen-induced increase in the acidic protein binding of polyamines and their translocation to a functional cellular site such as nuclear chromatin. In the prostate cytosol, spermine also binds to 4-S tRNAs and to a unique RNA which has a sedimentation coefficient of 1.5 S. | [
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PMID:28787 | Apparent stability constants of H+ and Mg2" complexes of 5-phosphoribosyl alpha-1-pyrophosphate. | Apparent Mg2+ and H+ stability constants of 5-phosphoribosyl alpha-1-pyrophosphate (ligand, L) complexes were determined from pH titration data at 25 degrees C with an average of 0.17 M NaCl or KCl and 0.20 M ionic strength. The logarithms of calculated macroscopic overall stability constants are: 3.2 (MgL3-), 4.8 (Mg2L-), 6.5 (HL4-), 12.4 H2L3-), 9.4 (Mg HL2-), and 11.0 (MgH2L). Comparison of the stepwise Mg2+ stability constants (log k = 3.2 and 1.6) with those of MgADP- and MgAMP or Mg-hexose-1-P suggests that the first and second Mg2+ bind to the 1-PP and 5-P groups of the ligand, respectively. Reasonable assumptions about relative microscopic constants indicate that several of the microscopic isomers do not achieve significant concentrations over a large range of conditions. Judging from other data on organophosphate complexes, it is likely that the constants of this study may be extrapolated with little error to other conditions of ionic strength 0.1--0.2 M) and temperature (e.g., 15--35 degrees C), and widely different monovalent ion concentrations. | Apparent stability constants of H+ and Mg2" complexes of 5-phosphoribosyl alpha-1-pyrophosphate. Apparent Mg2+ and H+ stability constants of 5-phosphoribosyl alpha-1-pyrophosphate (ligand, L) complexes were determined from pH titration data at 25 degrees C with an average of 0.17 M NaCl or KCl and 0.20 M ionic strength. The logarithms of calculated macroscopic overall stability constants are: 3.2 (MgL3-), 4.8 (Mg2L-), 6.5 (HL4-), 12.4 H2L3-), 9.4 (Mg HL2-), and 11.0 (MgH2L). Comparison of the stepwise Mg2+ stability constants (log k = 3.2 and 1.6) with those of MgADP- and MgAMP or Mg-hexose-1-P suggests that the first and second Mg2+ bind to the 1-PP and 5-P groups of the ligand, respectively. Reasonable assumptions about relative microscopic constants indicate that several of the microscopic isomers do not achieve significant concentrations over a large range of conditions. Judging from other data on organophosphate complexes, it is likely that the constants of this study may be extrapolated with little error to other conditions of ionic strength 0.1--0.2 M) and temperature (e.g., 15--35 degrees C), and widely different monovalent ion concentrations. | [
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PMID:28788 | 3-Chloroacetylpyridine adenine dinucleotide phosphate, an alkylating analogue of NADP+. | An alkylating analogue of NADP+ the 3-chloroacetylpyridine adenine dinucleotide phosphate was prepared from 3-diazoacetylpyridine adenine dinucleotide phosphate which was obtained by enzymatic transglucosidation of NADP+. The 3-diazoacetylpyridine adenine dinucleotide phosphate proved to be more unstable when compared to the corresponding NAD+ analogue. The alkylation of several dehydrogenases using this alkylating analogue is mentioned. | 3-Chloroacetylpyridine adenine dinucleotide phosphate, an alkylating analogue of NADP+. An alkylating analogue of NADP+ the 3-chloroacetylpyridine adenine dinucleotide phosphate was prepared from 3-diazoacetylpyridine adenine dinucleotide phosphate which was obtained by enzymatic transglucosidation of NADP+. The 3-diazoacetylpyridine adenine dinucleotide phosphate proved to be more unstable when compared to the corresponding NAD+ analogue. The alkylation of several dehydrogenases using this alkylating analogue is mentioned. | [
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PMID:28790 | Testosterone-attenuated stereotype and hyperactivity induced by beta-phenylethylamine in pargyline-pretreated rats. | Testosterone pretreatment (1.0-4.0 mg/kg) attenuated, in a dose-response fashion, the induction of stereotyped behavior and hyperactivity by pargyline (0.25, 4.0 mg/kg) and beta-phenylethylamine (8.0, 16.0 mg/kg) in preubertal, male rats. The dyskinetic movements induced by pargyline and beta-phenylethylamine were proposed as a possible animal model for tardive dyskinesias. Attenuation by testosterone of these effects suggested an hormonal involvement consistent with the reported predominant occurrence of tardive dyskinesias in women and in the elderly. | Testosterone-attenuated stereotype and hyperactivity induced by beta-phenylethylamine in pargyline-pretreated rats. Testosterone pretreatment (1.0-4.0 mg/kg) attenuated, in a dose-response fashion, the induction of stereotyped behavior and hyperactivity by pargyline (0.25, 4.0 mg/kg) and beta-phenylethylamine (8.0, 16.0 mg/kg) in preubertal, male rats. The dyskinetic movements induced by pargyline and beta-phenylethylamine were proposed as a possible animal model for tardive dyskinesias. Attenuation by testosterone of these effects suggested an hormonal involvement consistent with the reported predominant occurrence of tardive dyskinesias in women and in the elderly. | [
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PMID:28794 | Bone marrow colony-forming cells in acute drug-induced agranulocytosis. | The capacity to differentiate and form colonies in vitro by bone marrow granulocytic precursor cells and its evolution were studied in eight cases of drug-induced acute agranulocytosis. In three cases colonies and clusters count were normal or high. These cases were probably immunological agranulocytosis. In the five other cases this number was very low and returned to normal from three to thirteen days. These were probably cases of marrow suppression by the drug. | Bone marrow colony-forming cells in acute drug-induced agranulocytosis. The capacity to differentiate and form colonies in vitro by bone marrow granulocytic precursor cells and its evolution were studied in eight cases of drug-induced acute agranulocytosis. In three cases colonies and clusters count were normal or high. These cases were probably immunological agranulocytosis. In the five other cases this number was very low and returned to normal from three to thirteen days. These were probably cases of marrow suppression by the drug. | [
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PMID:28795 | Immunological profile in sarcoidosis patients. The in vitro and in vivo effect of thymic humoral factor. | A study was made of the lymphocytes obtained from 25 patients suffering from sarcoidosis as proved by the Kveim-Siltzbach test and/or organ biopsy. The number of T lymphocytes was determined by the E rosette technique and functional activity by a local xenogeneic graft-versus-host reaction (GVHR) as well as skin tests with PPD, SK-SD, Candida and Trichophyton. In most cases the absolute number of T cells was low and there was an evident impairment of their functional activity. There was also a clear correlation between the severity of impairment of cell-mediated immunity and the clinical stage and activity of the disease. In vitro incubation of the lymphocytes with thymic humoral factor resulted in recovery of the functional activity of the T lymphocytes of 4 of the 7 patients tested, with the previously negative GVHR becoming positive. One of these patients was treated with thymic humoral factor with a resulting restoration of the cell-mediated immune response although there was no evident clinical improvement. | Immunological profile in sarcoidosis patients. The in vitro and in vivo effect of thymic humoral factor. A study was made of the lymphocytes obtained from 25 patients suffering from sarcoidosis as proved by the Kveim-Siltzbach test and/or organ biopsy. The number of T lymphocytes was determined by the E rosette technique and functional activity by a local xenogeneic graft-versus-host reaction (GVHR) as well as skin tests with PPD, SK-SD, Candida and Trichophyton. In most cases the absolute number of T cells was low and there was an evident impairment of their functional activity. There was also a clear correlation between the severity of impairment of cell-mediated immunity and the clinical stage and activity of the disease. In vitro incubation of the lymphocytes with thymic humoral factor resulted in recovery of the functional activity of the T lymphocytes of 4 of the 7 patients tested, with the previously negative GVHR becoming positive. One of these patients was treated with thymic humoral factor with a resulting restoration of the cell-mediated immune response although there was no evident clinical improvement. | [
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PMID:28796 | Hydrogen ion CO2 and buffer capacity in brain from water depleted rats. | pH, C02 and buffer capacity of the brain and blood acid-base status were studied in (C) control and in acutely water depleted (WD) rats. WD rats developed a greater metabolic [H+] increase in brain than in blood. The results suggest that brain [H+] change is a primary metabolic reply to acute dehydration. | Hydrogen ion CO2 and buffer capacity in brain from water depleted rats. pH, C02 and buffer capacity of the brain and blood acid-base status were studied in (C) control and in acutely water depleted (WD) rats. WD rats developed a greater metabolic [H+] increase in brain than in blood. The results suggest that brain [H+] change is a primary metabolic reply to acute dehydration. | [
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PMID:28797 | Equilibrium and kinetics of the thermal unfolding of alpha-lactalbumin. The relation to its folding mechanism. | The thermal unfolding of alpha-lactalbumin has been studied by equilibrium measurements of aromatic difference spectra, and by kinetic measurements of the Joule heating temperature-jump. The unfolding at neutral pH is a reversible two-state transition. The equilibrium transition curves are analyzed by the nonlinear squares method, which gives correct values of thermodynamic parameters based on the data in a wide range of temperature. The results are discussed in relation to the previous studies on the unfolding by guanidine hydrochloride or by acid. The thermally unfolded state, a partially unfolded species, is shown to be thermodynamically similar to but not identical with the acid state. The folding pathway deduced from the kinetic results is essentially consistent with the folding model of alpha-lactalbumin proposed previously. Large decreases in entropy and in heat capacity during the reversed activation suggest the packing of the folded segments by hydrophobic interactions, while the forward activation shows a marked temperature dependence, probably caused by the disruption of specific long-range interactions. | Equilibrium and kinetics of the thermal unfolding of alpha-lactalbumin. The relation to its folding mechanism. The thermal unfolding of alpha-lactalbumin has been studied by equilibrium measurements of aromatic difference spectra, and by kinetic measurements of the Joule heating temperature-jump. The unfolding at neutral pH is a reversible two-state transition. The equilibrium transition curves are analyzed by the nonlinear squares method, which gives correct values of thermodynamic parameters based on the data in a wide range of temperature. The results are discussed in relation to the previous studies on the unfolding by guanidine hydrochloride or by acid. The thermally unfolded state, a partially unfolded species, is shown to be thermodynamically similar to but not identical with the acid state. The folding pathway deduced from the kinetic results is essentially consistent with the folding model of alpha-lactalbumin proposed previously. Large decreases in entropy and in heat capacity during the reversed activation suggest the packing of the folded segments by hydrophobic interactions, while the forward activation shows a marked temperature dependence, probably caused by the disruption of specific long-range interactions. | [
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PMID:28798 | Continuous fractionation of human plasma. | Continuous processing has been applied to human plasma fractionation by the cold ethanol process. On-line pH control of +/- 0.05 pH units, flow control of +/- 1%, and temperature control of +/- 0.5 degree C have been achieved. Optimization of precipitation pHs has been carried out for purifying plasma protein fractions and albumin. During precipitation, the irreversible nature of the pH overshoots has been demonstrated. Compared to the batch processing mode, the continuous scheme produces an increased yield between 6 to 11%. | Continuous fractionation of human plasma. Continuous processing has been applied to human plasma fractionation by the cold ethanol process. On-line pH control of +/- 0.05 pH units, flow control of +/- 1%, and temperature control of +/- 0.5 degree C have been achieved. Optimization of precipitation pHs has been carried out for purifying plasma protein fractions and albumin. During precipitation, the irreversible nature of the pH overshoots has been demonstrated. Compared to the batch processing mode, the continuous scheme produces an increased yield between 6 to 11%. | [
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PMID:28799 | Toxic effects of fatty acids on yeast cells: possible mechanisms of action. | As shown in a previous paper, threshold concentrations of lower and intermediate fatty acids inhibit the uptake of inorganic phosphate, growth, and cell division in yeast cells. This demonstrates that, apart from these effects, the acids cause an increase in the respiration quotient (RQ), inhibition of CO2 fixation, production of ethanol at the expense of anabolic processes, and inhibition of active amino acid transport in the yeast Candida utilis. On the other hand, the threshold concentrations have no effect on intracellular pH. The inhibition of the inorganic phosphate uptake cannot be the sole primary mode of action of fatty acids since the omission of inorganic phosphate in the incubation medium brings about an inhibition of anabolic processes that is lower than that brought about by fatty acids since the omission of inorganic phosphate in the incubation medium brings about an inhibition of anabolic processes that is lower than that brought by fatty acids at concentrations still premitting some phosphate uptake. Although 2,4-dinitrophenol and caproic acid at low concentrations cause an analogous decrease in biomass yield, their combination does not bring about any marked increase in the effect. Considering the physicochemical properties of fatty acids and their preferential action on energy-requiring processes, one of the key sites of action can be assumed to be the mitochondrial membrane. Fatty acids might inhibit the transport of anions, especially phosphate, across the membrane, and disturb the membrane potential by affecting the transport protons. The physiocochemical properties of fatty acids may also give rise to their binding to other intracellular membranes and to a subsequent interference with the function of the corresponding organelles. | Toxic effects of fatty acids on yeast cells: possible mechanisms of action. As shown in a previous paper, threshold concentrations of lower and intermediate fatty acids inhibit the uptake of inorganic phosphate, growth, and cell division in yeast cells. This demonstrates that, apart from these effects, the acids cause an increase in the respiration quotient (RQ), inhibition of CO2 fixation, production of ethanol at the expense of anabolic processes, and inhibition of active amino acid transport in the yeast Candida utilis. On the other hand, the threshold concentrations have no effect on intracellular pH. The inhibition of the inorganic phosphate uptake cannot be the sole primary mode of action of fatty acids since the omission of inorganic phosphate in the incubation medium brings about an inhibition of anabolic processes that is lower than that brought about by fatty acids since the omission of inorganic phosphate in the incubation medium brings about an inhibition of anabolic processes that is lower than that brought by fatty acids at concentrations still premitting some phosphate uptake. Although 2,4-dinitrophenol and caproic acid at low concentrations cause an analogous decrease in biomass yield, their combination does not bring about any marked increase in the effect. Considering the physicochemical properties of fatty acids and their preferential action on energy-requiring processes, one of the key sites of action can be assumed to be the mitochondrial membrane. Fatty acids might inhibit the transport of anions, especially phosphate, across the membrane, and disturb the membrane potential by affecting the transport protons. The physiocochemical properties of fatty acids may also give rise to their binding to other intracellular membranes and to a subsequent interference with the function of the corresponding organelles. | [
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