Table 1.

Wild type and CL-lacking cells are able to maintain a WT level Δμ_H⁺ at two different pH values of the growth medium.

		W3110	BKT12
ΔΨ	pH 5.5	−113 ± 8	−117 ± 6
	pH 7.0	−98 ± 6	−95 ± 6
ΔpH	pH 5.5	−75 ± 7	−70 ± 9
	pH 7.0	−35 ± 6	−38 ± 8

ΔΨ (mV) and ΔpH (mV) were determined from radioactive lipophilic cation TPP⁺ and weak acid DMO distribution between the internal volume of intact cells and the cell medium by the silicone oil-spin method. Values are means (± S.D.) from three experiments, where each determination was done in duplicate.