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- W2100667068 abstract "summaryInternodal cells of the euryhaline charophyte Lamprothamnium papulosum exhibited a transient slow down of the cytoplasmic streaming when transferred to a medium containing hexacyanoferrate III (HCF III). The reduced form, hexacyanoferrate II, was without effect. The extent of the streaming inhibition, which appeared with a time lag of ≃ 3 min after addition of the redox reactant, was a function of the HCF III concentration. The inhibition could be prevented by preconditioning cells in the Ca2+-channel antagonist LaCl3 or by lowering the Ca2+ concentration in the external medium even though these treatments did not greatly affect the rate of extracellular HCF III reduction. We therefore conclude that HCF III generates a Ca2+ influx into the cytoplasm. The resulting transient increase in cytoplasmic free Ca2+ inhibits the Ca2+-sensitive streaming mechanism. Streaming inhibition was observed in acid (pH 55) and alkaline (pH 8) media. Because HCF III induced only a marked depolarization in alkaline medium, Ca2+ influx is not a consequence of a decrease in transmembrane voltage.The treatments that protected cytoplasmic streaming from inhibition by HCF III did not affect the decrease in membrane resistance caused by the redox reactant. Ca2+ influx is therefore unlikely to be a major mechanism by which HCF III affects membrane transport pathways." @default.
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- W2100667068 date "1990-08-01" @default.
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- W2100667068 title "Extracellular hexacyanoferrate III inhibits cytoplasmic streaming in the alga Lamprothamnium papulosum" @default.
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- W2100667068 doi "https://doi.org/10.1111/j.1469-8137.1990.tb00489.x" @default.
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