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Flow cytometric analysis of acid-adapted Escherichia coli O157:H7 cells treated with 0.2 to 1.6% acetic acid (a), citric acid (b), lactic acid (c), malic acid (d), phytic acid (PA) (e), or NaCl-HCl solutions with pH values equivalent to those of 0.2 to 1.6% PA solutions (f).
