and mixed cultures of rat caecum contents and on the acid production by Lactobacillua arabino8u8 has been studied. 2 . Growth of Bact. coli or of mixed cultures was not markedly affected by any one of the methyl- tryptophans in the concentrations used; that of Lb. arabino8sw was considerably inhibited hy the 7- methyl compound.
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Haurowitz et al. (1949) studied this question.
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