Abstract

THAT amino-acids can inhibit growth of certain bacteria has been known for some time1. Thus Gladstone2 showed that several strains of Bacillus anthracis which grew well on a synthetic amino-acid medium failed to grow when leucine or valine was added in concentrations as low as 1 µgm. per ml.; but a very small amount of leucine could abolish the inhibitory effect of valine and vice versa. A similar, though less marked, relationship was shown to exist between serine and threonine.

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