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1 Laboratory of Living Matter, and Center for Studies in Physics and Biology, The Rockefeller University, 1230 York Avenue, New York, NY 10021, U.S.A.; Racah Institute for Physics, The Hebrew University, Jerusalem 91904, Israel. 2 Laboratory of Living Matter, and Center for Studies in Physics and Biology, The Rockefeller University, 1230 York Avenue, New York, NY 10021, U.S.A.
A fraction of a genetically homogeneous microbial populationmay survive exposure to stress such as antibiotic treatment.Unlike resistant mutants, cells re-grown from such persistentbacteria remain sensitive to the antibiotic. We investigatedthe persistence of single cells of Escherichia coli using microfluidicdevices. Persistence was linked to pre-existing heterogeneityin bacterial populations as phenotypic switching occurred betweennormally growing cells and persister cells having reduced growthrates. Quantitative measurements led to a simple mathematicaldescription of the persistence switch. Inherent heterogeneityof bacterial populations may be important in adaptation to fluctuatingenvironments, and in the persistence of bacterial infections.
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