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2. There is a lag in growth and oxygen uptake on transferring cells from growth on glucose to an amino acid medium during which the enzymes for amino acid catabolism are formed. 3. In the presence of glucose, or any of a variety of alternative energy sources, adaptation for amino 'acid breakdown is repressed. 4. The effect of glucose on the induction of individual enzymes in the catabolic pathways of tyrosine and histidine has been measured with cellfree extracts. 5. p-Hydroxyphenylpyruvate hydroxylase and homogentisate oxygenase, the second and third enzymes of tyrosine degradation, are repressed by glucose, but tyrosine transaminase, the first enzyme, is neither induced by tyrosine nor repressed by glucose. 6. Histidase and urocanase, the first enzymes in the histidine pathway, are repressed by glucose. 7. Utilization of tyrosine or histidine by fully adapted cells is not decreased in the presence of glucose or other metabolic repressors except acetate. 8. Induction and repression of amino acid oxidation are complementary control mechanisms by which the large enzymic potential of this organism is regulated.

Soluble derivatives of feather keratin. 1. Isolation, fractionation and amino acid composition