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Chronobiology (Circadian Rhythms)

Chapter

Abstract

Our earth is spinning, making a complete turn in 24 h. If the axis of this rotation were in the plane of the sun’s rays, half the earth would always be in darkness, half in light. Fortunately for us, the earth does not spin in this manner. Instead, its axis of rotation is roughly perpendicular to the sun’s rays, so that most of the surface of the earth is alternately illuminated and in shadow. All organisms have evolved in this changing illumination, which we know as day and night. It is not surprising, then, that they have adapted to this situation. For example, some animals are active only during the day, while others are nocturnal. Perhaps only the bacteria disregard the periodic quality of natural illumination.

Keywords

Circadian Rhythm Light Pulse Circadian Clock Action Spectrum Biological Clock 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1977

Authors and Affiliations

  1. 1.Department of Biological SciencesUniversity of CaliforniaSanta BarbaraUSA

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