Circadian Clock Action Spectrum in a Photoperiodic Moth

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Science  07 Feb 1969:
Vol. 163, Issue 3867, pp. 583-585
DOI: 10.1126/science.163.3867.583


A circadian rhythm of egg hatching in the moth Pectinophora gossypiella can be initiated with a brief light pulse. The action spectrum for this effect has a peak in the blue and near ultraviolet region of the spectrum with a sharp cutoff above 500 nanometers and a more gradual cutoff below 390 nanometers.

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