FIG 1.

Comparative survival of isogenic constructs. Serial dilutions of strains RJ12 (WT), RJ13 (Δogg), RJ401 (Δdbh), and RJ803 (Δogg Δdbh) in xylose-tryptone medium were incubated under nongrowth conditions (23°C with 9 h fluorescent illumination per day or 37°C in the dark). Viable counts were determined by plating at the times indicated. The data are averaged from three independent trials. The error bars indicate ±1 standard error of the mean and do not overlap for the last time points of the WT or Δogg strain versus the Δogg Δdbh strain under either condition. Similarly, the following slopes calculated by linear regression differed by the sum of twice the standard error of each regression for the following cases, indicating statistical significance (52): 23°C, WT versus Δogg Δdbh (−0.1137 versus −0.1803); 37°C, Δogg versus Δogg Δdbh (−0.1028 versus −0.1711).