Circadian Clock in Insect Photoperiodism

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Science  01 May 1970:
Vol. 168, Issue 3931, pp. 601-603
DOI: 10.1126/science.168.3931.601


Night-interrluption experiments with the wasp Nasonia vitripennis maintained in 48- and 72-hour light: dark cycles reveal two and three peaks of light sensitivity (diapause inhibition), respectively. The first peak is 19 hours after lights-on in all regimes tested; the later peaks occlur at 24-hour intervals thereafter, providing evidence for the circadian nature of the photoperiodic clock in this insect.

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