AbstractThe orientation behavior of Paramecium changed in a similar way after transition to conditions of free-fall in a sounding rocket and after transition to conditions of simulated weightlessness on a fast rotating clinostat. After a period of residual orientation, Paramecium cells distributed themselves randomly 80 s (120 s) after onset of free-fall (simulated weightlessness). Swimming velocity increased significantly; however, the increase was transient and subsided after 3 min in the rocket experiments, while the velocity remained enhanced even during 2 h of rotation on a fast clinostat. Trichocysts were present and without morphological changes in Paramecium cells which had been exposed to a rocket flight, as well as to fast or slow rotation on a clinostat. Regeneration of the oral apparatus of Stentor and morphogenesis of Eufolliculina proceeded normally on the clinostat. The results demonstrate that the clinostat is a useful tool to stimulate the conditions of weightlessness on earth and to detect gravisensitive cellular functions.


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    Title :

    Protozoa as model systems for the study of cellular responses to altered gravity conditions


    Contributors:
    Hemmersbach-Krause, R. (author) / Briegleb, W. (author) / Häder, D.-P. (author) / Vogel, K. (author) / Klein, S. (author) / Mulisch, M. (author)

    Published in:

    Publication date :

    1994-01-01


    Size :

    12 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



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