Substitutes for Potassium in Metabolism of the Lowest Fungi

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Abstract
K is necessary for Gram-positive bacteria, but not for most Gram-negative species. Yeast needs K; the only substitute is Rb. No other radioactive element can take the place of K. Exposure of a yeast culture in a K-free medium to the /3-radiation of K through a cellophane window did not permit growth, proving radiation not to be the only factor in K-requirement. Possibly a great ion mobility is the other factor involved in the indispensability of K in most living cells.