Circadian Chronotypic Death in Heat-Synchronized Infradian Mode Cultures of Tetrahymena pyriformis W

Continuous cultures of Tetrahymena pyriformis in the infradian ("slow-exponential") growth mode can be entrained to give circadian rhythms of cell division by the application of thermal cycles with periods of 24 hr. The degree of synchronization (phasing index) is dependent on the cycling...

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Bibliographic Details
Published in:Microbial ecology 1975-09, Vol.2 (3), p.201-214
Main Authors: John C. Meinert, Ehret, Charles F., Antipa, Gregory A.
Format: Article
Language:English
Subjects:
Cell cycle
Cell death
Cell division
Cell growth
Circadian rhythm
Cultured cells
Euglena
Eukaryotic cells
Oxygen
Zeitgebers
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Summary:Continuous cultures of Tetrahymena pyriformis in the infradian ("slow-exponential") growth mode can be entrained to give circadian rhythms of cell division by the application of thermal cycles with periods of 24 hr. The degree of synchronization (phasing index) is dependent on the cycling of other environmental agents, particularly food in the form of the defined medium used. The phase angles of these multiple zeitgebers to one another and to the circadian cell cycle markedly influence the quality of synchronization achieved. In well-synchronized oxygen-limited cultures, a circadian cytotoxia (circadian chronotypic death) is observed when the culture's oxygen requirements periodically exceed the oxygen support limit of the environment.
ISSN:0095-3628
1432-184X
DOI:10.1007/BF02010440