Effect of thermal,oxidative, acidic,osmotic, or nutritional stresses on subsequent culturability of Escherichia coli in seawater |
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Authors: | P M Munro R L Clement G N Flatau M J Gauthier |
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Institution: | (1) Institut National de la Santé et de la Recherche Médicale, Unité 303, C.E.R.B.O.M., 1 Avenue Jean Lorrain, 06300 Nice, France |
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Abstract: | Survival of stressed Escherichia coli with or without the rpoS gene was assessed after 2 and 6 days in sterile seawater. Cells were submitted to thermal (48°C), acidic (pH 5.1), oxidative (H2O2 1mm), nutritional (C, N, P starvation), or osmotic (NaCl 0.5m) stresses for periods ranging from 0 to 4 h. We found a stress-mediated cross protection against seawater relative to controls. Viability was higher when cells were acid, oxidatively, nutritionally or osmotically stressed. Survival increased in cells stressed at 37°C as compared with 20°C. With the exception of osmotic stress, we found that this stress-induced cross protection was rpoS dependent.Correspondence to: P.M. Munro. |
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