Fig. 4

Acid resistance of L. brevis strains in phosphate buffer (pH 2.5) with 10 mmol/L MSG. Stationary-phase cells of L. brevis CGMCC1306 (WT), L. brevis ΔgadA, L. brevis ΔgadB, L. brevis ΔgadC, L. brevis ΔgadAΔgadB and L. brevis ΔgadB: pMG36e-gadB were exposed to a pH of 2.5, and the numbers of viable cells were estimated over time. Standard deviations were calculated from the results of three independent experiments