Growth-phase-dependent acid tolerance in L.Monocytogenes. (a) Cultures were grown to either exponential.(the red line) or stationary (the dark green; 24 h culture) phase. The pH was then.Reduced to 3.0 with HCI and cell viability was measured a t the.Time intervals shown. (b) Acid resistance measured throughout.Growth. A culture of strain Scott A was set up and viable cell.Counts were performed a t appropriate intervals in order to.Monitor growth (light green) line. Samples were also removed from the.Culture throughout growth in order to assess acid resistance.Viable cell counts were performed immediately before and.After an acid challenge a t pH 3.0 for 90 min and results are.Presented as percentage survival (blue line).
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