FIG 4.

RpoS can be protective in exponential phase. (A) Actively growing cells of the indicated strains were treated with 2% SDS, and viability was assayed at 0 and 7 h. Fold changes between the 0- and 7-h time points (7-h sample/0-h sample) are shown. Filled bars indicate untreated samples, while open bars indicate treated samples. *, P < 0.05, for comparisons both between the treated and untreated samples and between the indicated strains. (B) Carbon-limited cells of the indicated strains were treated with 2% SDS, and viability was assayed after 24 h. The fold decrease in the treated samples versus the untreated samples is shown (untreated sample/treated sample). *, P < 0.05, for comparisons of results for the indicated strains.