Current-Voltage Relations during Illumination: Photoreceptor Membrane of a Barnacle

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Science  10 Oct 1969:
Vol. 166, Issue 3902, pp. 240-243
DOI: 10.1126/science.166.3902.240


In voltage clamped photoreceptor cells of the barnacle, light-induced membrane current varied nonlinearly with membrane potential and changed sign at about + 27 millivolts (reversal potential) independently of light intensity. Instantaneous current-voltage relations were linear and intersected the voltage axis at the reversal potential. Illumination increased membrane conductance that was dependent on membrane potential, light intensity, and time.