Diurnal fluctuation in dna content and DNA synthesis in the dorsal epidermis of Rana pipiens

William W. Morgan, Sherwin Mizell

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

1. 1. DNA content and DNA synthesis (3H-thymidine uptake) were measured in dorsal skin epidermis of frogs-Rana pipiens sacrificed in groups of 12 over a period of 24 hr-exposed to a 12 : 12 light-dark lighting régime for 2 weeks before sacrifice. 2. 2. Diurnal fluctuations were observed in both DNA content and DNA synthesis of dorsal epidermis. 3. 3. The reproducibility of these rhythms suggests that they are true physiological phenomena with periodicities of nearly 24 hr. 4. 4. The results of light inversion experiments suggest the importance of the lighting régime in the regulation of these rhythms.

Original languageEnglish (US)
Pages (from-to)591-602
Number of pages12
JournalComparative Biochemistry and Physiology -- Part A: Physiology
Volume38
Issue number3
DOIs
StatePublished - Mar 1 1971
Externally publishedYes

Keywords

  • H-thymidine uptake
  • cell division
  • Circadian rhythm
  • diurnal fluctuations
  • DNA content
  • DNA synthesis
  • exogenous stimulus
  • frog metabolism
  • growth
  • lighting régime
  • Rana pipiens
  • rhythms

ASJC Scopus subject areas

  • Physiology

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