Abstract
114 strains of lactose-fermenting yeasts comprising at least 10 spp. and genera were used in this study. These organisms grew equally as well in the presence or absence of riboflavin. Microbiol. assay of the quantity of riboflavin synthesized by lactose-fermenting yeasts indicated that from 0.06 to 0.11 7 of riboflavin were synthesized per 10 ml. of culture.

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