Figure 1.

Effect of chromosomal deletion of mdtM on growth of E. coli cells at alkaline pH. (A) Growth phenotypes of wild-type (WT) and mdtM-deletion mutant (ΔmdtM) E. coli BW25113 cells grown at different alkaline pH’s on LB agar. As indicated, 4 μl aliquots of a logarithmic dilution series of cells were spotted onto the solid media and the plates were incubated for 24 h at 37°C prior to digital imaging. (B) Growth of wild-type and ΔmdtM E. coli BW25113 cells in liquid LB media at different alkaline pH values. Data points and error bars represent the mean ± SE of three independent measurements.