Sodium ions are necessary for growth and energy transduction in the marine cyanobacterium Oscillatoria brevis |
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| Authors: | Igor I. Brown Sergey I. Fadeyev Lyudmila M. Gerasimenko Irina I. Kirik Marina Ya. Pushenko Inna I. Severina |
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| Affiliation: | (1) Department of Biology, Moscow State University, SU-119899 Moscow, USSR;(2) Department of Genetics and Molecular Biology, Odessa State University, SU-270057 Odessa, USSR;(3) Department of Lithotrophic Microorganisms, Institute of Microbiology Academy of Sciences USSR, SU-117812 Moscow, USSR |
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| Abstract: | The maximal growth rate of the marine cyanobacterium Oscillatoria brevis was reached at 200–400 mM NaCl and pH 9.0–9.6. NaCl was found (i) to stimulate the rate of the light-supported   generation across the cytoplasmic membrane of the cells and (ii) to decrease the sensitivity of level and motility of the O. brevis trichomes to protonophorous uncouplers. The Na+/H+ antiporter, monensin, increased both and the uncoupler sensitivity of the cells. The data obtained agree with the assumption that O. brevis possesses a primary Na+ pump in its cytoplasmic membrane.Abbreviations ATP adenosine-5 -triphosphate - TTFB tetrachlortrifluoromethylimidazol - CCCP carbonyl cyanide m-chlorophenylhydrazone -  Na+ transmembrane electrochemical potential differences of Na+ - transmembrane electric potential difference - pNa transmembrane pNa difference |
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| Keywords: | Oscillatoria brevis Sodium ions Photosynthesis Energy transduction |
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