Figure 1.

Influence of the initial pH on pH change in different bacterial strains. Cells were inoculated in either Luria-Bertani (LB) complex medium (panels (A–C)) or defined minimal M63 medium with glucose as C-source (panels (D–F)). The pH of the medium (discontinuous lines) and cell-growth (A₆₀₀ nm, continuous lines) were measured at the indicated times for E. coli ATCC 25,922 (panels (A,D)), Pseudomonas putida KT2440 (panels (B,E)), and Pseudomonas pseudoalcaligenes CECT 5344 (panels (C,F)).