FIG. 2.

Fluorimetric determination of ΔΨ of H. pylori at pH 7 (A) and pH 3 (B). Cells were added at an OD₅₇₈ of ∼0.03 to citrate-phosphate buffer containing 1 μM DiSC₃(5). The times when 5 mM urea, 150 nM TCS, and 2% n-butanol were added are indicated. Excitation was at 600 nm, and emission was at 665 nm.