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Science 8 November 1968:
Vol. 162. no. 3854, pp. 677 - 679
DOI: 10.1126/science.162.3854.677
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Articles

A Hyperpolarizing Component of the Receptor Potential in the Median Ocelius of Limulus

John Nolte 1, Joel E. Brown 1, and T. G. Smith Jr. 2

1 Department of Biology and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge 02139
2 National Institute of Neurological Diseases and Blindness, Bethesda, Maryland

There are two classes of photoreceptor cells in the median ocellus of Limulus. One class of cells respond to long wavelength (visible) stimuli with a depolarizing receptor potential and to near ultraviolet light with a biphasic, initially hyperpolarizing, receptor potential. The other class of receptors respond with a depolarization to near ultraviolet and with a biphasic response to visible light. In the latter type of cell, visible light can counteract the depolarization elicited by near ultraviolet light. The evidence suggests that there are two photopigments in each cell and that both are involved in the generation of receptor potential.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
A Visual Pigment with Two Physiologically Active Stable States.
P. Hillman, S. Hochstein, and B. Minke (1972)
Science 175, 1486-1488
   Abstract »    PDF »
Optics and Visual Physiology.
R. E. Carr (1970)
Arch Ophthalmol 84, 238-251
   PDF »


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Science. ISSN 0036-8075 (print), 1095-9203 (online)