Heating mixtures of sodium nitrite, cysteine, and either ferrous sulfate or ferric chloride at 121 C for 20 min at pH 6.5 or 6.3 produced a potent inhibitor of Clostridium perfringens vegetative cells and spores when added to previously heat-sterilized fluid thioglycolate medium. When the mixtures containing FeSO4 at pH 5.2 or FeCl3 at pH 2.7 were heated, the inhibitory effect was not produced....

this research evaluates the efficiency of nanosized zno in the catalytic ozonation of 4-chloro-2-nitrophenol and determines the effect of ph on heterogeneous catalytic ozonation. the combined use of ozone and zno catalyst leads to conversion of 98% 4-chloro-2-nitrophenol during 5 min. in addition, it was found that in zno catalytic ozonation, the degradation efficiency of 4-chloro-2-nitrophenol...

Our previous report showed gastric mucosal surface pH was determined by alkali secretion at intragastric luminal pH 3 but by acid secretion at intragastric pH 5. Here, we question whether regulation of mucosal surface pH is due to the effect of luminal pH on net acid/base secretions of the whole stomach. Anesthetized rats with a gastric cannula were used, the stomach lumen was perfused with wea...

Serotonin activates respiration and enhances the stimulatory effect of CO2 on breathing. The present study tests whether the mechanism involves the retrotrapezoid nucleus (RTN), a group of medullary glutamatergic neurons activated by extracellular brain pH and presumed to regulate breathing. We show that the RTN is innervated by both medullary and pontine raphe and receives inputs from thyrotro...

Stimulation of glycolysis accompanies a rise in pH in intact polymorphonuclear leukocytes and supernatant preparations derived from homogenates of these cells. The curve of lactate production plotted against pH for the cell-free system was steepest between pH 6.5 and 7.0. Our studies indicate that phosphofructokinase is the key control point, and a secondary locus of control may be at glycerald...