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SUMMARY: The inhibition of growth of a brewer’s yeast and four other yeasts by l-ethionine, and the annulment of the inhibition by l-methionine were examined. S-Methyl- l-cysteine, dl-methionine sulphoxide and dl-α-amino-n-butyric acid were also able to decrease the growth inhibition. At a fivefold molar concentration, S-methyl cysteine annulled completely the effect of ethionine on the brewer’s yeast. S-Ethyl- l-cysteine was ineffective and in certain conditions it acted as a growth inhibitor; this inhibition was annulled by methionine and by S-methylcysteine.
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