Fig. 6.

Effects of various stressors on the survival or growth of Listeria monocytogenes 568 and mutant L. monocytogenes 568:ΔTreA. Cells were subjected to high osmolarity (20% NaCl in BHI) (A), repeated freeze-thaw cycling (−80 and 37°C every 24 h in BHI, TSB, and TSB-Tre) (B), ethanol (18%, vol/vol) (C), hydrogen peroxide (0.1%, vol/vol) (D), high acidity (pH 3.5) (E), and low temperature (4°C) (F). The results are the mean populations for three independent experiments with corresponding standard errors.