Pathological Phenomena

  • Erwin Bünning
Part of the Heidelberg Science Library book series (HSL)

Abstract

As we have seen, in some plants and animals the physiological clock controls the diurnal changes in responsiveness to light and temperature. The phenomena of photo- and thermoperiodism show that a normal development of many plants and animals is only possible if the light-dark cycles or cycles of high and low temperature approximate to the 24-hour rhythm. Exposing these organism to external cycles which deviate considerably in length from the 24-hour cycle inevitably results in disturbances, and the way it originates varies from case to case. By offering abnormal cycles, light or darkness, high or low temperature may coincide with a physiological phase which is adjusted to the opposite of the prevailing conditions. We also know (see p. 63) that the physiological periodicity can only follow the external periodicity within certain limits, so that when the deviations are too great, the physiological oscillations become free-running. The consequences thereof are the theme of this chapter.

Keywords

Chlorophyll Bleach Folk TODT 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1964

Authors and Affiliations

  • Erwin Bünning
    • 1
  1. 1.University of TübingenGermany

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