FIG. 7.

Bacterial survival following exposure to thermal stress and oxidative stress. Wild-type and rgg mutant cultures were exposed to puromycin, 41°C, or paraquat for 24 h; sham-treated cultures were used as controls. Viability was determined by dilution plating and is expressed as the CFU per milliliter for cultures exposed to stress divided by the CFU per milliliter for control cultures. The values are the means ± standard errors of the means obtained in five independent experiments. An asterisk indicates that the difference in viability between the strains was significant (P < 0.05).