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- W2296877892 abstract "The time course of the recovery of the sensitivity of the Limulus ventral nerve photoreceptor was measured during dark adaptation following light adaptation by a bright 1 or 5 s illumination. The stimulus intensity I CR of a 300 μs light flash evoking a response of criterion amplitude (receptor potential or receptor current under voltage clamp conditions) was used as measure of sensitivity. The time course of dark adaptation shows two phases with time constants in the range of 5-9 s and 300-500 s (15 °C). Only the first of the two phases is significantly changed when the extracel- lular Ca 2+ -concentration is varied. The power function I CR = a·I o -t DA -b gives a good data fit for each of the two phases of dark adaptation. In the first phase the factor a x and the exponent b x are decreased when the external calcium is lowered from 10 mmol/1 to 250 μmol/1. Conversely a 1 and b 1 are increased when the Ca 2+ -concentration is raised to 40 mmol/1. For the second phase neither a 2 nor b 2 is changed significantly upon the changes in calcium concentration in the same experiments. The two phases of dark adaptation reflect the behaviour of the two components C 1 and C 2 of the electrical light response (receptor potential or receptor current). Under the conditions described here C, determines the size of the light response during the first phase of dark adaptation whereas C 2 mainly influences the size of the response during the second phase. Interpretation: The fast first phase of dark adaptation is determined by the change in intracellu- lar Ca 2+ -concentration. The slower second phase of dark adaptation is not primarily calcium- controlled." @default.
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- W2296877892 date "1986-06-01" @default.
- W2296877892 modified "2023-10-15" @default.
- W2296877892 title "The Sensitivity of the Ventral Nerve Photoreceptor of Limulus Recovers after Light Adaptation in Two Phases of Dark Adaptation" @default.
- W2296877892 doi "https://doi.org/10.1515/znc-1986-5-626" @default.
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