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Science 17 November 1972:
Vol. 178. no. 4062, pp. 755 - 756
DOI: 10.1126/science.178.4062.755
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Articles

Ionic Basis of the Photoresponse of Aplysia Giant Neuron: K+ Permeability Increase

H. Mack Brown 1 and Arthur M. Brown 1

1 Departments of Physiology and Medicine, University of Utah Medical Center, Salt Lake City 84112

The giant neuron of the Aplysia abdominal ganglion hyperpolarizes during illumination. The light-initiated potential change is associated with an increase of membrane conductance. It reverses sign at the potassium equilibrium potential (about -83 millivolts), which was determined from direct measurements of internal potassium activity. The membrane hyperpolarization is produced entirely by a light-induced increase in potassium permeability.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Light-induced changes in the structure of pigmented granules in aplysia neurons.
M Henkart (1975)
Science 188, 155-157
   Abstract »    PDF »
Ionic Basis of Hyperpolarizing Receptor Potential in Scallop Eye: Increase in Permeability to Potassium Ions.
J. S. McReynolds and A. L. F. Gorman (1974)
Science 183, 658-659
   Abstract »    PDF »


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