Abstract

Examination of representative samples of top yeasts from British breweries revealed invariably the presence of strains of Flavobacterlum proteus, Lactobacillus and Acetobacter and the absence of significant numbers of Pediococcus and other bacteria. Three solid selective media have been developed which permit relatively rapid independent estimation of the numbers of each type present in pitching yeast. Flovobacterium proteus usually constituted 90% or more of the living bacterial population, cells of Lactobacillus and Acetobocter species in about equal proportions accounting for the remainder.

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