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Survival of strains NZ131 and OK171 in medium enriched with 0.2 % glucose (cumulative concentration 0.4 %). Values shown of c.f.u. and culture pH are the mean and standard deviation of two independent experiments. The lines show the c.f.u. values for the cultures, and the areas filled with vertical and horizontal lines indicate the pH (NZ131 and OK171, respectively).
