SUMMARY: The effects of the polyoxyethylene stearate detergents MYRJ 45 and MYRJ 52 on FT-9, an amino-acid-liberating mutant strain of , and on the parent strain were investigated. Both strains were capable of growth in the presence of these detergents, which induced the liberation of amino acids by the parent strain and increased the liberation of amino acids by the mutant strain. Some changes in the spectrum of amino acids liberated by the mutant strain were observed in the presence of detergents, notably the liberation of tryptophan, which was not detected in the absence of detergents.


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