Fig. 13

The combination of the arcA and rsxC mutations increases the levels of expression of the soxS::lacZ fusion. Strain ENZ1843 (soxS::lacZ) and derivatives ENZ2420 (ΔarcA), ENZ2421 (ΔrsxC) and ENZ2436 (ΔarcA ΔrsxC) were inoculated (0.1 ml) into 50 ml of Pi-limiting medium and β-galactosidase activities were determined in exponentially growing cells (6 h of incubation; OD₆₀₀ = 0.1; n = 2) (ex) and in non-growing cells (24 h of incubation; n = 3) (P-). The values are the means ± standard deviations for n independent experiments