@inproceedings{oai:jaxa.repo.nii.ac.jp:00013690,
 author = {竹田, 明日香 and 最上, 善広 and 馬場, 昭次 and Takeda, Asuka and Mogami, Yoshihiro and Baba, Shoji A.},
 book = {宇宙利用シンポジウム, Space Utilization Research: Proceedings of Space Utilization Symposium},
 month = {Mar},
 note = {第22回宇宙利用シンポジウム(2006年1月17日-19日, 日本学術会議6階会議室 六本木、東京), The Twenty-second Space Utilization Symposium (January 17-19, 2006: Science Council of Japan, Roppongi, Tokyo, Japan), Gravitaxis of swimming microorganisms has so far been explained largely in terms of the physical properties of the microorganisms that are assumed not to have any speculative mechanisms of gravity sensation. However gravity-induced sensory input and the subsequent modulation of locomotor activity in Paramecium has been suggested by precise analyses of swimming velocity as a function of swimming direction with respect to the gravity vector (Ooya et al, 1992). As a result, Paramecium appears to modulate its propulsive effort depending on the swimming direction by increasing the propulsive speed in upward and decreasing it in downward directions. These results suggesting gravikinesis were obtained from the averaged measurement on a large number of the cell. In the present study we aimed to confirm the results on the basis of the measurement on the swimming of a single cell. Velocities of upward and downward swimming was measured from the single cell, and the velocity of sinking was measured on the same cell which was immobilized in Ni(sup 2+) containing medium. We did not find significant differences between the propulsive thrust to upward and downward directions which were calculated by the above motility parameters. It may be partly because of the disturbances to the cell in the course of the isolation, which is suggested by the straight swimming trajectories., 共催: 日本学術会議, Meeting sponsors: The Science Council of Japan, The Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (ISAS)(JAXA), 資料番号: AA0064113073},
 publisher = {宇宙航空研究開発機構宇宙科学研究本部, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)},
 title = {ゾウリムシにおける重力依存的推進力調節の可能性: 単一個体での解析},
 volume = {22},
 year = {2006}
}