FIG. 4.

Viable counts of L. monocytogenes Scott A and OSY-8578 suspended in 12.5 mM phosphate buffer (pH 7.2) and treated with mild PEF (27.5 kV/cm for 144 μs) and heat (55°C for 10 min). From left to right within each group, the bars represent the untreated control, PEF treatment, heat treatment, PEF treatment followed by 10 min of incubation at 25°C prior to heat treatment, PEF treatment followed by 30 min of incubation at 25°C prior to heat treatment, and heat treatment followed by 10 min of incubation at 25°C prior to PEF treatment.