FIG. 6.

Effects of lower concentrations of CA (a) and DCA (b) on the internal pH of membrane vesicles of L. salivarius subsp. salicinius JCM 1044. Artificial ΔpH was established by the addition of 10 μl 2 N KOH to the membrane vesicle suspension in 2 ml 50 mM potassium phosphate buffer, which altered the external pH from 6.5 to about 6.8. The other experimental conditions were the same as those described in the legend to Fig. 5.