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Fluorescence intensity recorded after staining with DiBac4(3). (a) L. monocytogenes populations left untreated or treated by gramicidin (5 μmol · liter−1 for 15 min) or (50 μmol · liter−1 for 15 min); (b) L. monocytogenes populations treated by high pressure (275, 325, or 400 MPa; 10 min) or heat-treated (121°C, 15 min).
