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.
Protozoa as model systems for the study of cellular responses to altered gravity conditions
Advances in Space Research ; 14 , 8 ; 49-60
01.01.1994
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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