Figure 4.

Total EPS quantification performed on cells obtained from mid-exponential cultures grown in GSM media at pH 7.0 or pH 5.6. In the figure, the EPS production in mg of glucose per mg of protein is plotted on the ordinate for each of the two S. meliloti strains indicated on the abscissa at the two respective pHs. The data are the means of three independent experiments ± standard deviations. The error bars represent standard deviations of the mean. The Tukey test was used to analyze the replicates. Common letters denote no significant difference (p > 0.05).