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• W1966288034 endingPage "249" @default.
• W1966288034 startingPage "240" @default.
• W1966288034 abstract "Freshwater species of the cyanobacterial genus Synechococcus import NaCl passively, and export Na+ actively, by means of primary and secondary extrusion mechanisms. As a result of the ion and water fluxes, cell volumes are enlarged. We show in this paper that the NaCl-induced volume enlargement of Synechococcus sp. PCC 7942 cells is attended by a rapid (k = 0.39 s−1) increase in chlorophyll (Chl) a fluorescence. The cell turgor threshold (measured by osmotic titration of Chl a fluorescence) was lower in the absence of NaCl (0.195 Osm kg−1) than in the presence of 0.4 M NaCl (0.248 Osm kg−1) indicating NaCl uptake by the cells. Turgor thresholds of cells suspended in NaCl-containing medium were enlarged further by protonophoric uncouplers, P-type ATPase inhibitors, and light starvation, conditions that are known to interfere with the active extrusion of Na+ ions. Cell swelling exerts probably a regulation on the distribution of phycobilisome (PBS) excitation between photosystem II (fluorescent Chl a) and photosystem I (nonfluorescent Chl a), since it affects PBS-sensitized Chl a fluorescence, but not directly excited Chl a fluorescence. The dependence of the Chl a fluorescence of cyanobacteria on cell volumes allows probing of bioenergetic phenomena that are related to dynamic osmotic volume changes, transmembrane solute and water fluxes, plasma membrane permeabilities, and internal osmotic conditions of cyanobacterial cells. Thus, cyanobacteria may serve as quite convenient models of aquatic microorganisms in experimental studies directed toward the elucidation of perception mechanisms and defense mechanisms of water and solute stresses." @default.
• W1966288034 created "2016-06-24" @default.
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• W1966288034 date "1999-10-01" @default.
• W1966288034 modified "2023-10-17" @default.
• W1966288034 title "Sodium Chloride-Induced Volume Changes of Freshwater Cyanobacterium Synechococcus sp. PCC 7942 Cells Can Be Probed by Chlorophyll a Fluorescence" @default.
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• W1966288034 doi "https://doi.org/10.1006/abbi.1999.1366" @default.
• W1966288034 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/10510283" @default.
• W1966288034 hasPublicationYear "1999" @default.
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