FIG. 1.

Survival rates of B. cereus ATCC 14579 and B. cereus FM1400 during exposure to H₂O₂. The survival rates of B. cereus ATCC 14579 cells (open symbols) and the cells of sigB deletion mutant B. cereus FM1400 (closed symbols) were determined upon exposure to H₂O₂. Cells were grown until the mid-exponential growth phase either aerobically or anaerobically. Aerobically grown cultures were exposed to 10 mM H₂O₂ in the mid-exponential growth phase (circles) or after a heat shock from 30°C to 42°C for 30 min (squares). Anaerobically grown cultures were exposed to 2 mM H₂O₂ (diamonds). The averages of three independent experiments are shown. The error bars indicate standard deviations.