FIG. 1.

Induction of acid tolerance (expressed as percentages of survival after a pH_o 4.0 challenge) in L. lactis subsp. cremoris NCDO 712 by slow growth rates and sublethal pH_o values in steady-state chemostat cultures growing at pH_o 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 five replicate experiments; the standard deviation in each case was less than 10% of the mean.