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Rapid increase in acid tolerance (□) following a sudden decrease in the pHi (○) of a continuous culture of L. lactis subsp. cremoris NCDO 712 due to the addition of acetic acid at zero time to a steady-state culture at a dilution rate of 0.5 h−1. In the presence of chloramphenicol (25 μg/ml) the increase in the ATR (◊) in the transition culture was completely abolished.
