RECENTLY Kocholaty & Hoogerheide [1938] described an example of the adaptation of certain of the endo-enzymes of the strict anaerobe Cl. sporogenes: by varying the pH of the culture medium a considerable shift in the pH optimum of some of the dehydrogenases could be produced. It has now been found that under specified conditions the pH optimum of the proteinase secreted by this micro-organism can be shifted, and that, by repeated subculturings on gelatin or casein, specific proteinases are developed which will hydrolyse gelatin, but not casein, and vice versa.
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Kocholaty et al. (1938) studied this question.
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