PMID: 591913Nov 1, 1977

A quantitative comparison of the effects of intracellular calcium injection and light adaptation on the photoresponse of Limulus ventral photoreceptors

The Journal of General Physiology
A Fein, J S Charlton

Abstract

Calcium ions were iontophoretically injected into ventral photoreceptors of Limulus by passing current between two intracellular pipettes. Changes in sensitivity and photoresponse time course were measured for both light adaptation and Ca++ injection. We found for some photoreceptors that there was no significant difference in the photoresponse time course for desensitization produced by light adaptation or by Ca++ injection. In other photoreceptors, the time delay of photoresponse for Ca++ injection was slightly longer than for light adaptation. The variability of threshold response amplitude and time delay decreases when the photoreceptor is desensitized by either light adaptation or Ca++ injection. The peak amplitude versus log stimulus intensity relationships for controls, light adaptation, and Ca++ injection all could be described very closely by a single template curve shifted along the log intensity axis. A 40- to 50-fold change in sensitivity is associated with a 2-fold change in photoresponse time delay for both light adaptation and Ca++ injection.

Citations

Nov 1, 1979·Brain Research Bulletin·V J Wulff, J L Fahy
Jul 1, 1984·Brain Research Bulletin·V J WulffJ L Fahy
Jan 1, 1988·Comparative Biochemistry and Physiology. C, Comparative Pharmacology and Toxicology·L Kass, M D Berent
Mar 1, 1997·The Journal of General Physiology·M P Gomez, E Nasi
Mar 1, 1982·The Journal of General Physiology·B Minke
Jun 1, 1982·The Journal of General Physiology·F WongF A Dodge
Mar 1, 1989·The Journal of General Physiology·P M O'Day, M P Gray-Keller
Jan 1, 1991·The Journal of General Physiology·E Nasi
Feb 1, 1991·The Journal of General Physiology·P M O'DayM Lonergan
Jan 1, 1981·Progress in Biophysics and Molecular Biology·G L Fain, J E Lisman
Jul 1, 1979·Journal of Psychedelic Drugs·M Worden, G Rosellini

Related Concepts

Light Adaptation
Calcium
Tachypleus
Resting Potentials
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