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- W944400938 abstract "The long, slender cones of the teleost retina elongate at night and contract during the day. In the Midas cichlid, Cichlasoma citrinellum, this cone excursion is elicited both by changes in light conditions and by strong endogenous circadian rhythms. In a normal day/night cycle. C. citrinellum cones change length by 69 micron. We have found that in this species an endogenous circadian rhythm induces substantial cone excursion in contrast light as well as in constant darkness. Total excursion in constant light is 34% of that seen in a normal cycle. Total excursion in constant darkness is 58% of that seen in a normal cycle. Similar excursions are observed on the second and third days of constant darkness. A change from light to darkness at a time in the cycle other than dusk induces elongation averaging 49% of the total excursion observed in the normal cycle. A change from darkness to light at a time other than dawn induces cone contraction averaging 30% of the total excursion observed in the normal cycle. The response of retinal cones to either of the above changes in light conditions is a relatively constant magnitude at all sampling times over a 24 hr period. We conclude that both the endogenous circadian rhythm and the responses to changes in light conditions of the cones and required to produces the full excursion observed in the normal day/night cycle. Full elongation of cones can occur only at night in darkness, and full contraction of the cones can occur only in the day in the light. Changing light conditions at inappropriate times produces intermediate cone lengths." @default.
- W944400938 created "2016-06-24" @default.
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- W944400938 date "1981-03-01" @default.
- W944400938 modified "2023-09-23" @default.
- W944400938 title "Circadian rhythms in teleost retinomotor movement. A comparison of the effects of circadian rhythm and light condition on cone length." @default.
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