ADAPTIVE PROPERTIES OF THE b-WAVE AND THE PIII IN THE PERFUSED ISOLATED CARP RETINA

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  • 浅野 俊樹
    Department of Aerospace Physiology, The Research Institute of Environmental Medicine, Nagoya University

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  • Adaptive Properties of the b Wave and t

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1. Perfusion of isolated carp retina with a pure oxygen saturated standard solution used in this experiment permitted several continuous hours of ERG recordings showing a distinctive b-wave as well as the PIII isolated by sodium aspartate.<BR>2.The dark-adapted threshold for the PIII required an absorption of 5 to 6 quanta per rod.The‘rod-cone break’in the increment threshold curve for the b-wave was induced at a background intensity of about 2.0×10-2, μW/cm2.<BR>3.Both the b-wave and the PIII showed rapid and complete recovery of sensitivity after exposure to dim adapting lights.After bright light adaptation, the sensitivities went through a short‘fast phase’followed by a prolonged‘slow phase’of recovery.The rate of recovery during the fast phase was significantly faster for the PIII than for the b-wave. Neither a lowered temperature (9°C) nor the application of ouabain (10-6 M) influenced the fast phase.This seems to prove that the visual pigment, photoproducts and the active transport hardly participate in its mechanism, if at all.<BR>4.The prolonged slow phase that followed the fast phase was distinguished by the recovery of the rod activity, even in isolated retinas.

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