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titleEffect of clinorotation on the proliferation of Paramecium tetraurelia
Other Titleゾウリムシ(P.tetraurelia)の細胞増殖へのclinorotationの影響
Author(jpn)澤井 里枝; 最上 善広; 馬場 昭次
Author(eng)Sawai, Satoe; Mogami, Yoshihiro; Baba, Shoji A.
Author Affiliation(jpn)お茶の水女子大学 大学院人間文化研究科; お茶の水女子大学 理学部 生物学科; お茶の水女子大学 大学院人間文化研究科
Author Affiliation(eng)Ochanomizu University Graduate School of Humanities and Sciences; Ochanomizu University Department of Biology, Faculty of Science; Ochanomizu University Graduate School of Humanities and Sciences
Issue Date2005-03
PublisherInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)
Publication title宇宙利用シンポジウム 第21回 平成16年度
Space Utilization Research: Proceedings of the Twenty-first Space Utilization Symposium
Start page194
End page197
Publication date2005-03
AbstractParamecium has been known to proliferate faster under microgravity in space, and slower under hypergravity. Experiments using axenic culture medium have demonstrated that the hypergravity affected directly on the proliferation of Paramecium itself (Kato et al., 2003). An attempt to elucidate the mechanisms underlying the gravity-dependent changes in proliferation in terms of the cellular energetics in relation to the motile activities has been made. Paramecium would be assumed to decrease the energy expenditure for motility under microgravity and increase it under hypergravity because of the characteristics of 'gravitaxis' and 'gravikinesis'. The larger stock of energy would enhance the proliferation activity under microgravity and smaller stock would reduce the activity under hypergravity. In order to assess the feasibility of the assumption above, Paramecium tetraurelia was grown under simulated weightlessness performed by clinorotation. Under clinorotation with the rotation rate of 2.5 rpm, Paramecium proliferated to 51 percent lower saturation density than that under control normal gravity. This reduced proliferation activity was found under the clinorotation with higher rate (4.8 rpm) but appeared less pronounced with lower rotation rate (0.2 rpm).
Keywordsparamecium; proliferation; clinorotation; cultured cell; curve fitting; least square method; gravitation; logistic growth equation; time course; gravitational effect; ゾウリムシ; 増殖; 傾斜回転; 培養細胞; カーブフィッティング; 最小2乗法; 重力; ロジスティック成長式; 時間経過; 重力効果
Document TypeConference Paper
JAXA Categoryシンポジウム・研究会

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