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- W2036836629 abstract "I/V relationships were performed by the voltage clamp technique in the sphaerical green alga Eremosphaera viridis de Bary. We focused on the course of the transient potential (TP) found in light-off experiments when specific potassium channels open. I/V measurements done during this period show a N-shaped curve. The shape depended on external potassium. TPs could be released by light-off and by addition of barium, strontium, or α-naphthyl phosphate. We calculated the number of specific potassium channels to be between 1750 and 34 825 channels per cell. Barium (1 mol × m−3) and tetraethylammonium (10 mol × m−3) inhibited TPs. I/V relationships demonstrated, when N-shaped, that potassium channels start to close at voltages more negative than −195 mV (0.1 mol × m−3 K+), −160 mV (1 mol × m−3 K+) and −148 mV (10 mol × m−3 K+). In the region of −300 mV conditions similar to those at rest are reached. External sodium suppressed the development of N-shaped I/V relationships and reduced the membrane conductance during a TP between 8 % and 29 %. This indicates an influence of external sodium on potassium channels." @default.
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- W2036836629 date "1989-11-01" @default.
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- W2036836629 title "Potassium Channels in <i>Eremosphaera viridis</i> : Modulation of Channel Opening, Conductance and Inhibition*" @default.
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- W2036836629 doi "https://doi.org/10.1111/j.1438-8677.1989.tb00107.x" @default.
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