SUPPLEMENTARY GROWTH PROMOTING EFFECT OF 2-METHYL-1,4-NAPHTHOQUINONE ON LACTOBACILLUS BIFIDUS VAR. PENNSYLVANICUS

Abstract

L. bifidus var. pennsylvanicus, a mutant requiring N-acetyl-D-glucosamine -containing saccharides for growth, gives 100-200% increased growth with 2-methyl-l,4-naphthoquinon in concentrations of 0.001 [mu]g/ml of medium, in the presence of lower levels of the essential growth factor. Of the compounds examined, this supplementary growth effect was limited to menadione, vitamin K1, K5, Synkayvite and 1,4-naphth-oquione.