title: Effects of gravity and cosmic rays on cell proliferation kinetics in Paramecium tetraurelia.
abstract: Space flights resulted in a stimulating effect on kinetics of proliferation in Paramecium tetraurelia. Additional experiments were performed in order to determine the origin of this phenomena. Paramecia were cultivated in balloon flights or in a slow clinostat, or were exposed to different levels of hypergravity. The results suggest that changes in cell proliferation rate are related to cosmic rays and to a direct effect of microgravity.
authors.affiliation: Laboratoire de Biologie Medicale, Faculte de Medecine, Toulouse, France.
authors.forename: R
authors.initials: R
authors.lastname: Tixador
authors.forename: G
authors.initials: G
authors.lastname: Richoilley
authors.forename: G
authors.initials: G
authors.lastname: Gasset
authors.forename: H
authors.initials: H
authors.lastname: Planel
mesh_terms: D000818:Animals; D002455:Cell Division; D015169:Colony Count, Microbial; D003359:Cosmic Radiation; D018471:Hypergravity; D016805:Paramecium tetraurelia / Q000166:cytology* / Q000502:physiology / Q000528:radiation effects; D012399:Rotation; D013026:Space Flight; D014893:Weightlessness