The use of ethidium bromide to assess a novel injury/recovery phenomenon in Listeria monocytogenes in inhibitory NaCl conditions


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Abstract

An injury and recovery phenomenon was observed in Listeria monocytogenes inoculated into a medium containing 2.2 mmol l−1 NaCl, a concentration that was inhibitory to growth. The apparent loss then recovery of viability, as determined by plate counts, was compared with the uptake of ethidium bromide by the cells and found to be inversely related. Injury was caused not only by the initial osmotic up-shock but also by the subsequent down-shock involved in the spread plate protocol.

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