The current-voltage (I/V) profiles of Ventricaria (formerly Valonia) membranes were measured at a range of external potassium concentrations, [K+] o , from 0.1 to 100 mm. The conductance-voltage (G/V) characteristics were computed to facilitate better resolution of the profile change with time after exposure to different [K+] o . The resistance-voltage (R/V) characteristics were computed to attempt resolution of plasmalemma and tonoplast. Four basic electrophysiological stages emerged: (1) Uniform low resistance between −60 and +60 mV after the cell impalement. (2) High resistance between +50 and +150 for [K+] o from 0.1 to 1.0 mm and hypotonic media. (3) High resistance between −150 and −20 mV for [K+] o of 10 mm (close to natural seawater) and hypertonic media. (4) High resistance between −150 and +170 mV at [K+] o of 100 mm.
The Journal of Membrane Biology – Springer Journals
Published: Sep 1, 1999
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