Fig. 4.

Survival (log CFU/ml) of exponentially growing cells in UHT-processed whole milk after 6 s at 72°C for Listeria monocytogenes LO28 wild-type cells, their recultured survivors of the heat treatment (Heatsurv), and their recultured survivors of a similar subsequent heat treatment (HeatHeatsurv). The dotted line indicates the initial level of cells (9 log CFU/ml). Each inactivation experiment was conducted at least two times on different days. The error bars show one standard deviation. Results in white bars are statistically different from the results for the wild type.