Summary
The tolerances of a cell line (IMC-HZ-1) from a moth,Heliothis zea, for the monovalent cations Na+ and K+ were defined. Cells shifted to media containing more than 70mm of K+ showed decreased growth rates. No evidence was obtained for Na+ toxicity. The osmotic pressure tolerances were influenced by the K+ concentration of the medium. The richer the medium was in K+, the narrower was the spectrum of osmotic pressure tolerance. Once the limit of K+ tolerance was exceeded, the rate of decline of growth was linear with respect to further increases in K+. This rate of decline was independent of osmotic pressure.
The initial responses of cells during one subculture (2 to 4 population doublings) in media differing from the standard medium (used to maintain the cell line) were not reliable indicators of the growth potential of the cells. Continued subculture in such media resulted in an upward trend in population growth rates in most cases.
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This investigation was supported by U. S. Public Health Service Research Grant no. AI 09914 from the National Institute of Allergy and Infectious Diseases. This is Paper no. 8637, Scientific Journal Series, Minnesota Agricultural Experiment Station. The material is part of the dissertation of T. J. K. presented for the Ph.D. degree at the University of Minnesota.
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Kurtti, T.J., Chaudhary, S.P.S. & Brooks, M.A. Influence of physical factors on the growth of insect cells in vitro. In Vitro 11, 274–285 (1975). https://doi.org/10.1007/BF02615638
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DOI: https://doi.org/10.1007/BF02615638