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Light-driven proton pump activity in P. torquis cell suspensions. The pH changes in the suspension media were measured (initial pH: 7.7±0.5) under light (27.7 μmol photons m−2 s−1). The shaded area denotes completely dark conditions during the experiment. The incubation temperature was 1 (±0.5)°C. Carbonylcyanide-3-chlorophenylhydrazone (CCCP) was added at a final concentration of 10 μM.
