Simple slide-rule conversion between hydrogen ion concentration and pH values.

The statistical treatment of hydrogen ion concentration and pH.

Quantitative Relationships between Phosphory Flow, and Internal Hydrogen Ion Concentration

1. Further evidence that the uptake of [“C jhexylamine, determined by centrifugal filtration of spinach chloroplast thylakoids through silicone fluid layers, gives precise estimations of light-induced H’ concentration gradients (ApH) is presented. ApH was independent of the amount of thylakoids used or of the concentration of hexylamine. Moreover, hexylamine uptake was sensitive to the osmolari...

Hydrogen Ion Concentration and Pepsin Digestion

One of the most striking peculiarities of enzyme action is the fact that the activity of the enzyme is limited to a definite range of acidity. If the solution is more or less acid than this the enzyme is practically inactive. SSrensen 1 showed that for a number of enzymes the determiuing factor was the hydrogen ion concentration and not the total acidity of the solution. In attempting to accoun...

The Hydrogen-Ion Concentration of Cholera Stools

Hydrogen ion concentration changes in mitochondrial membranes.

1. Bromthymol blue added to rat liver mitochondria at concentrations in the range 0.4 to 4.0 mpmoles per mg of protein is tightly bound as indicated by centrifugation and washing of the mitochondria. 2. The absorbance of the dye is increased on adding Ca++ or Mn++ to the mitochondria in the absence of a permeant anion. The extent of increase is 0.03 cm-l for 167 PM Ca++ at 618 rnp for 0.5 mpmol...