FIG. 5.

Resistance of the wild type and the ΔyafD mutant of SE2472 to hydrogen peroxide (A) and UV irradiation (B). (A) The wild-type and ΔyafD mutant of strain SE2472 were incubated in LB broth containing 1 mM hydrogen peroxide at 37°C. The survival of bacteria was determined by plating, and the results were plotted against incubation time. (B) Serial dilutions of the wild-type and ΔyafD mutant of SE2472 were plated on LB agar plates and exposed to UV irradiation. The concentrations of surviving bacteria were plotted against exposure time. At least three experiments were performed, and the results of a representative experiment performed in triplicate are shown. The error bars indicate standard deviations and are within the symbols in some instances.