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Science 16 June 1972:
Vol. 176. no. 4040, pp. 1240 - 1242
DOI: 10.1126/science.176.4040.1240
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Articles

Adaptation in Retinal Rods of Axolotl: Intracellular Recordings

S. R. Grabowski 1, L. H. Pinto 1, and W. L. Pak 1

1 Department of Biological Sciences, Purdue University, Lafayette, Indiana 47907

Intracellular recordings of the late receptor potential from rods of isolated axolotl retinas revealed the existence of a dark adaptation mechanism that is independent of rod pigment regeneration. Response amplitude of individual rods was measured as a function of intensity both before and at various times after exposure to bleaching illumination. The rod sensitivity increased by at least 3 to 4 log units during a period of 15 to 25 minutes following the bleach. During this time rod pigment regeneration was either too small to be measured or was nonexistent in our preparation.


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