Fig 6.

Growth profiles of wild-type versus ΔmrpA mutant strains of M. acetivorans cultured with growth-limiting 5 mM acetate. The starting pH was 6.8, and the Na⁺ concenration was 0.54 M. Data shown are the means ± standard deviations of four replicate experiments. Symbols: ■, wild type; ○, ΔmrpA mutant. The final optical densities for the wild type and mutant were 0.035 ± 0.003 and 0.012 ± 0.005, respectively.