Abstract
While cozymase was without effect on the dehydrogena-tion of xanthine by Schardinger enzyme and methylene blue, the dehydrogenation of acetaldehyde by this enzyme was strongly inhibited by active or inactive cozymase, adenyl pyrophosphate, adenylic acid, and adeno-sine. This inhibition was probably due to a combination of the dehydrogenase with the cozymase or other purine derivative, since reactions activated by cozymase, such as alcoholic fermentation and glycolysis, were inhibited by Schardinger enzyme.

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