OBSERVATIONS ON HYDRA AND PELMATOHYDRA UNDER DETERMINED HYDROGEN ION CONCENTRATION

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...

Influence of Hydrogen Ion Concentration on the Growth of Higher Plants under Controlled Conditions.

The effects of hydrogen ion concentration on plant growth occupy a prominient position in discussions of the adaptability of plants to their nutrient eiivironmelit. In the last two decades, with the improvements of methods of measurinig pH and particularly with the widespread adoption of the (lass eleetrode, increasing attention has been given to the hydrogen ion coneenitrationi in soils as it ...

The effect of hydrogen ion concentration on the anatomy of tobacco

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...