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- W2051001427 abstract "Abstract In populations of the fruitfly Drosophila pseudoobscura reared at constant temperature, first under continuous light, and then transferred to continuous darkness, pupal eclosion occurs in bursts at 24-hr intervals. A brief pulse of light resets the phase of this circadian rhythm by up to ± 12hr, depending on its energy and when it is given. The graphed dependence resembles a lattice of helicoidal surfaces. A new finding here detailed is that this rhythm's susceptibility to resetting by pulses of 10 2 to 10 4 ergs/cm 2 deviates systematically from the strict 24-hr periodism observed with more energetic stimuli: the clock oscillation becomes more sensitive to phase-resetting by light the longer it has been kept in the dark. In three days the sensitivity increases more than tenfold. This recovery process can be retarded by exposure to 10 7 erg/cm 2 . These observations are compatible with (i) a linear kinetic model involving a bleachable pigment which very slowly regenerates in darkness, or (ii) any of a diversity of models involving a non-periodic—e.g. damped—circadian oscillation. In either case, the saturation of the phase-resetting response by stimulus energies below 10 4 erg/cm 2 cannot be attributed to quantitative removal of the pigment." @default.
- W2051001427 created "2016-06-24" @default.
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- W2051001427 date "1972-04-01" @default.
- W2051001427 modified "2023-09-27" @default.
- W2051001427 title "On the photosensitivity of the circadian time-sense in Drosophila pseudoobscura" @default.
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- W2051001427 doi "https://doi.org/10.1016/0022-5193(72)90200-7" @default.
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