Endogenous Rhythms in Insects and Microorganisms

@article{Bruce1957EndogenousRI,
  title={Endogenous Rhythms in Insects and Microorganisms},
  author={Victor G. Bruce and Colin Stephenson Pittendrigh},
  journal={The American Naturalist},
  year={1957},
  volume={91},
  pages={179 - 195}
}
Twenty-four hour rhythms in organisms may be considered to be the rule rather than the exception. It is likewise the rule that such rhythms persist under constant conditions of light and temperature in the laboratory. This feature led sometime ago to their description as "persistent" rhythms or "endogenous" rhythms. The latter phrase carries the implication that the observed periodicity of organic activity is independent of those "Residual Periodic Variables," (cf. Pittendrigh, 1957… 
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