Conditionality of circadian rhythmicity: Synergistic action of light and temperature

  title={Conditionality of circadian rhythmicity: Synergistic action of light and temperature},
  author={David Njus and Laura M. McMurry and John Woodland Hastings},
  journal={Journal of comparative physiology},
With cells which have been grown at 20°C, the circadian rhythm of bioluminescence inGonyaulax polyedra disappears at a critical temperature, which is about 12°C. The transition from the rhythmic to the arrhythmic state is very sharp with temperature: the two states are separated by only 1–2°C. Following a return to a higher temperature (20°C) under otherwise constant conditions, the rhythm resumes with its new phase defined by the time of the cool to warm transition. Loss of rhythmicity also… CONTINUE READING

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