title: Circadian clock action spectrum in a photoperiodic moth.
abstract: 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.
authors.forename: V G
authors.initials: VG
authors.lastname: Bruce
authors.forename: D H
authors.initials: DH
authors.lastname: Minis