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Induced Division Synchrony in Tetrahymena vorax *
Author(s) -
WILLIAMS NORMAN E.
Publication year - 1964
Publication title -
the journal of protozoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.067
H-Index - 77
eISSN - 1550-7408
pISSN - 0022-3921
DOI - 10.1111/j.1550-7408.1964.tb01747.x
Subject(s) - tetrahymena pyriformis , division (mathematics) , cycling , sensitivity (control systems) , fission , cell division , temperature cycling , biology , tetrahymena , thermal , physics , thermodynamics , mathematics , microbiology and biotechnology , cell , geography , genetics , quantum mechanics , engineering , arithmetic , archaeology , electronic engineering , neutron
SYNOPSIS. Temperature‐cycling of the type used with T. pyriformis was applied to cultures of Tetrahymena vorax Tur in attempts to induce synchronous cell division. The best temperature‐cycling treatment found produced division indexes of 40% ( T. pyriformis yields 85%). The age‐dependent thermal sensitivity of untreated T. pyriformis which is often cited as an explanation for its response to temperature‐cycling has been demonstrated in T. vorax. However, a difference was noted which may explain the different degrees of synchrony obtained. It is suggested that the fission‐delay distributions obtained with T. pyriformis can be explained on the basis of an hypothesis in which all cells behave uniformly. In T. vorax , in contrast, the delay distributions suggest that the thermal sensitivity pattern is not the same in all cells.