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.
|Idioma original||English (US)|
|Número de páginas||12|
|Publicación||Comparative Biochemistry and Physiology -- Part A: Physiology|
|Estado||Published - mar. 1 1971|
|Publicado de forma externa||Sí|
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