Heat Produced by the Dark-adapted Bullfrog Retina in Response to Light Pulses

Overview

Journal Biophys J

Publisher Cell Press

Specialty Biophysics

Date 1986 Aug 1

PMID 3488768

Citations 3

Authors

I Tasaki

T Nakaye

Affiliations

Soon will be listed here.

Abstract

By using a pyroelectric detector constructed with a polyvinylidene fluoride film, a rapid rise in the temperature of the dark-adapted bullfrog retina induced by light was demonstrated. In the bullfrog retina, as in the squid retina examined previously, the heat generated in response to a brief light pulse was found to be far greater than the amount produced by conversion of the entire radiant energy of the stimulus into heat. The thermal responses consist of the heat generated by the photoreceptor and the postsynaptic elements in the retina, preceded by a small signal reflecting conversion of a portion of the radiant energy of the stimulus into heat. The dependence of the thermal responses on the light intensity, on the wavelength and on a variety of physical and chemical agents was examined. The exothermic process underlying the production of heat by the photoreceptor was found to precede the electrophysiological response of the retina.

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