Insect photoperiodism: the "T experiment" as evidence for an hourglass mechanism

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Science  02 Apr 1976:
Vol. 192, Issue 4234, pp. 59-60
DOI: 10.1126/science.1257756


"T experiments" demonstrate that the clock controlling termination of larval diapause in Ostrinia nubilalis is an hourglass mechanism that measures 8 hours of darkness. Circadian oscillations are not involved in photoperiodic time measurement in this species.