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- W2017036046 abstract "The transmembrane proton electrochemical potential gradient ΔμH+ in whole cells of Anacystis nidulans was measured in aerobic and anaerobic dark conditions using the distribution, between external medium and cell interior, of radioactively labeled weak acids (acetylsalicyclic acid, 5,5-dimethyloxazolidine-2,4-dione) or bases (imidazole, methylamine), and permeant ions (tetraphenylphosphonium cation, thiocyanate anion), as determined by flow dialysis. Alternatively, the movements across the plasma membrane of ΔpH-indicating atebrin or 9-aminoacridine, and of ΔΨ-indicating 8-anilino-l-naphthalenesulfonate were qualitatively followed by fluorescence measurements. Attempts were made to discriminate between the individual chemiosmotic gradients across the cytoplasmic (plasmalemma) and the intracytoplasmic (thylakoid) membranes. By use of the ionophores nigericin, monensin, and valinomycin, the components of the proton motive force, namely the proton concentration gradient ΔpH and the electric membrane potential ΔΨ were shown to be mutually exchangeable within the range of external pH values tested (3.2-11.0). Both components were depressed by the uncoupler carbonylcyanide m-chlorophenylhydrazone, though inhibition of ΔpH was much more pronounced than that of ΔΨ, notably in the alkaline pH0 range. The total proton electrochemical gradient across the plasma membrane was significantly higher in aerobic than in anaerobic cells and increased markedly (i.e. became more negative) towards lower pH0 values. This increase was paralleled by a similar increase in the rate of endogenous respiration of the cells. At the same time the ATPase inhibitor dicyclohexylcarbodiimide only slightly affected the proton motive force across the plasma membrane of aerobic cells. The results will be discussed in terms of a respiratorily competent plasma membrane in Anacystis nidulans." @default.
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- W2017036046 title "Transmembrane Proton Electrochemical Gradients in Dark Aerobic and Anaerobic Cells of the Cyanobacterium (Blue-Green Alga) <i>Anacystis nidulans</i>" @default.
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- W2017036046 doi "https://doi.org/10.1104/pp.79.1.278" @default.
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