Figure 5 Cultivation of G. xylinus in medium containing 4-hydroxybenzoic acid. The figure shows changes in (A) the glucose concentration of
the culture medium, (B) the pH value of the culture medium, (C) the concentration of living cells, and (D) the concentration of 4-hydroxybenzoic acid.
4-Hydroxybenzoic acid was added on day one. Error bars show standard errors of means of three replicates.