Figure 2From: pH-induced change in cell susceptibility to butanol in a high butanol-tolerant bacterium, Enterococcus faecalis strain CM4AButanol tolerance assay of E. faecalis strain CM4A. Growth curves of strain CM4A in the absence (a) and presence (b) of 2.0% butanol under different pH conditions. The values represent the mean of triplicate experiments. OD600, optical density at 600 nm.Back to article page