FIG. 4.

Effects of katE mutation on survival after entering the stationary phase. Wild-type and katE mutant cells were examined for colony-forming capacity after the exponential phase. MAFF303099 and ML2101D cells were cultivated aerobically in TY medium at 28°C. Aliquots were taken at the indicated times and measured for both OD₆₀₀ (triangles) and colony-forming capacity on TY agar medium (circles). Survival rates of 100% correspond to the colony-forming capacity determined at 35 h. The open symbols represent wild-type MAFF303099, while the closed symbols represent the katE mutant, ML2101D. The data are the means of three independent experiments. In each experiment, the colony-forming capacity was determined with at least four plates. The error bars indicate standard deviations.