- Wikipedia: Circadian Rhythm
User-edited article about the "internal body clock" that regulates the (roughly) 24-hour cycle of biological processes in animals and plants.
en.wikipedia.org/wiki/Circadian_rhythm
- Journal of Circadian Rhythms
Publishes papers on all aspects of circadian and nycthemeral (daily) rhythms in living organisms, including processes associated with photoperiodism and daily torpor.
www.jcircadianrhythms.com
- Experiments Confirm Novel Eye Pigment Controls Circadian Rhythm
A brief report by scientists at the University of North Carolina who say an eye pigment, cryptochrome, may control mammals' circadian rhythms.
www.eurekalert.org/pub_releases/1998-11/UoNC-DECN-191198.php
- Circadian Rhythm Laboratory
Provides research on biological rhythms, thermal physiology, data analysis, and academic issues.
www.circadian.org
- Circadian Rhythms
Provides charts, definitions, and examples of the circadian clock in fungi, plants, invertebrates, and mammals.
users.rcn.com/jkimball.ma.ultranet/BiologyPages/C/Circadian.html
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