title: Insect photoperiodism: the "T experiment" as evidence for an hourglass mechanism.
abstract: "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.
mesh_terms: D000818:Animals; D001683:Biological Clocks; D002940:Circadian Rhythm; D003624:Darkness; D007915:Lepidoptera / Q000502:physiology*; D008027:Light