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Flow cytometric analysis of acid-adapted Escherichia coli O157:H7 cells that were untreated (a) or treated with 2 to 4% NaCl (b to d), 0.2% PA (e), 0.4% PA (i), combinations of 0.2% PA (f to h) or 0.4% PA (j to l) plus 2 to 4% NaCl, a solution with a pH equivalent to that of 0.4% PA (o), or 2 to 4% NaCl solutions with pH values equivalent to those of 0.4% PA plus 2 to 4% NaCl (p to r).
