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pHi values of cells of L. lactis subsp. cremoris NCDO 712 growing in chemostat cultures at pHo values of 5.5 to 7.0 and dilution rates of 0.5 h−1 (cross-hatched bars), 0.33 h−1 (solid bars), and 0.17 h−1 (stippled bars). The data are the means of values from at least three replicate experiments; the standard deviation in each case was less than 10% of the mean.
