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Daily fluctuations of DNA synthesis in the corneas ofRana pipiens

Authors
Journal
Comparative Biochemistry and Physiology Part A Physiology
0300-9629
Publisher
Elsevier
Publication Date
Volume
40
Issue
2
Identifiers
DOI: 10.1016/0300-9629(71)90040-5
Keywords
  • Daily Rhythm
  • Dna Synthesis
  • Rhythms
  • 3H Thymidine
  • Growth
  • Cornea
  • Rana Pipiens
  • Lighting Régime
  • Cell Metabolism

Abstract

Abstract 1. 1. A diurnal rhythm in DNA synthesis, as indicated by fluctuations in total 3H thymidine uptake, was demonstrated in the corneas of frogs ( Rana pipiens). exposed to a 12 : 12 light-dark lighting régime for 2 weeks and then sacrificed in groups of twelve at 2-hr intervals over a 24-hr period. 2. 2. This rhythm was reproducible, appeared to have a periodicity of nearly 24 hr and was correlated with a similar rhythm in mitotic activity in corneas. 3. 3. Evidence is presented which suggests that the lighting régime may be involved in the regulation of this rhythm in DNA synthesis.

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