Influence of hydrogen ion concentration upon enzymic activity of three typical amylases

Influence of Temperature and Hydrogen Ion Concentration upon the Spore Cycle of Bacillus Subtilis

1. At 5 degrees C. no germination took place. 2. At 25 degrees C. and at 37 degrees C. germination occurs if the hydrogen ion concentration of the broth is kept between pH 5 and pH 10, but not at higher or lower pH values. 3. The completion of the spore cycle likewise requires a hydrogen ion concentration between pH 5 and pH 10. 4. The spores can germinate when the pH value is 10, although afte...

The influence of hydrogen-ion concentration upon the equilibrium state in phosphorylase systems.

Amphoteric Colloids. I. Cii_emical Influence of the Hydrogen Ion Concentration

I t is often stated (Pauli, H6ber, and others) that both ions of a neutral salt affect the physical properties of an amphoteric electrolyte (ampholyte) simultaneously and in the opposite sense; so that the total result is the algebraic sum of the opposite action of the oppositely charged ions of the neutral salt. 1 The writer has beelz able to show by experiments on gelatin and on pig's bladder...

The Effect of Hydrogen Ion Concentration upon the Determination of Calcium

McCrudden’s (1, 2) method has come to be recognized as the best for the accurate determination of calcium. The method is to precipitate the calcium as oxalate in the presence of sufficient ammonium chloride to hold the magnesium oxalate in solution, and of sufficient acid to hold the calcium oxalate partly in solution. Sodium acetate is then added to decrease the acidity and to precipitate the ...

The Effects of Hydrogen Ion Concentration upon the Metamorphic Pattern of Thyroxin- and Iodine-treated Tadpoles

1. It has been shown quantitatively that the degree of response of the hind limbs of tadpoles to the action of thyroxin is dependent upon the lengths of the limbs at the beginning of treatment. 2. Both the potency of the inducing substance and the rate of penetration of the substance into the animal might be involved in the effects of hydrogen ion concentration on induced development. 3. Change...