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Kinetics of acid adaptation of S. macedonicus. Mid-log-phase cells were adapted to pH 5.5 for 0 to 60 min and exposed to lethal challenge for 15 or 30 min (A and B, respectively). Percentages (means ± standard deviations) of fluorescent subpopulations, as determined by flow cytometry after cFDA-PI labeling, are presented.
