The amino-acid composition of certain bacteria and yeasts

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Abstract
Estimation of the combined amino-acid content of micro-organisms involves estimation of the total amino-acid content of acid hydrolysates corrected by a further estimation of the free amino-acid carried down on the surface and in the internal environment of the cells. The amino-acid composition of the protein of Escherichia coli or Aerobacter aerogenes was unaffected by widely varying growth conditions. Values are given for the arginine, lysine, histi-diue, tyrosine and glutamic acid contents of various bacteria and yeasts. The Gram-pos. cocci examined contained about half as much arginine as the Gram-neg. bacteria.