FIG. 2.
Levels of persistence to ampicillin or ofloxacin in late exponential phase. Cells were diluted 1:1,000 and induced with 0.2% arabinose at time zero. After 5 h; samples were removed and tested for their multidrug tolerance to 100 μg/ml ampicillin or 5 μg/ml ofloxacin. The starting cell number for each was 1 × 109 CFU/ml. Black bars, wild-type control (KLE421); white bars, overexpression of GlpD (KLE414); hatched bars, overexpression of inactive GlpD (KLE443). These data are the averages of three independent experiments, and the error bars correspond to the standard deviations of the means.