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. 2015 Dec 23;6:1437. doi: 10.3389/fmicb.2015.01437

Figure 3.

Figure 3

Decreased persistence levels of ΔureG, ΔsdhA, ΔsdhB mutants under acid stress (pH 3.0). Stationary-phase cultures of (A) ΔureG, (B) ΔsdhA, and (C) ΔsdhB knockout mutants and their complemented strains were harvested, washed, and then resuspended in TSB medium at pH 3.0. The vertical axis represents CFU values in log scale, and the horizontal axis represents the time of the acid (pH 3.0) treatment in days. The error bars indicate standard deviations. *indicates significant differences in comparison to the parent strain (p-value < 0.05).