SUMMARY: An examination was made of the effect of certain amino acids on the growth of three isolates of Sacc. and of six isolates of var. either as sole sources of nitrogen, or as supplements to ammonium nitrate. In all cases growth with aspartic acid was equal or nearly equal to that obtained with hydrolysed casein. Lysine and threonine were strongly inhibitory. The two varieties differ from each other in their reaction to cystine and cysteine, itself making as good growth with these amino acids as with hydrolysed casein, and var. being inhibited in growth.


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