@inproceedings{oai:jaxa.repo.nii.ac.jp:00013216,
 author = {鹿毛, あずさ and 細谷, 千春 and 馬場, 昭次 and 最上, 善広 and Kage, Azusa and Hosoya, Chiharu and Baba, Shoji A. and Mogami, Yoshihiro},
 book = {宇宙利用シンポジウム, Space Utilization Research: Proceedings of Space Utilization Symposium},
 month = {Feb},
 note = {第26回宇宙利用シンポジウム(2010年1月25日-26日, 宇宙航空研究開発機構宇宙科学研究本部相模原キャンパス), The Twenty-sixth Space Utilization Symposium (January 25-26, 2010: ISAS/JAXA Sagamihara, Japan), Bioconvection occurring in suspensions of the negatively-gravitactic unicellular protists can contribute to gravitational biology and future space research as an experimental tool for clarifying the possibility that gravity allows the emergence of novel properties of biological systems through collective interactions between the individual components. Although the suspension depth and the cell density are basic parameters for bioconvective pattern formation, the investigations of bioconvection of the flagellate Chlamydomonas have not so far fully described the effects of these parameters on the pattern transition phenomenon, i.e., a spontaneous and sudden decrease in pattern size of the steady-state bioconvection, which is peculiar to Chlamydomonas and has not been observed in other protists such as Tetrahymena. We study the depth- and the density-dependence of bioconvective behavior of Chlamydomonas reinhardtii, particularly of the pattern transition phenomenon. Striking differences in pattern size, morphology and stability were observed between the lower- (1 x 10(exp 6) cells/ml) and the higher-density (5 and 10 x 10(exp 6) cells/ml) suspensions. The effects of depth still remain unclear and further analyses are required. In the shallow, lower-density suspensions (2 mm; 1 x 10(exp 6) cells/ml), a peculiar, sometimes non-uniform "pox" pattern was repeatedly observed, which we had not seen previously. The "pox" broke down to form ripple-like fronts, and then the star-shaped patterns followed. Preliminary measurements showed little difference in the aggregation size between the "pox"  and the "stars." This fact obliges us to reconsider what the pattern transition is: the essence might be the spontaneous breakdown and the subsequent reconstruction of the patterns, and not a mere decrease in pattern size., 共催: 日本学術会議, joint hosting: The Science Council of Japan, 資料番号: AA0064730069},
 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 = {クラミドモナスの生物対流パターンの形成および遷移に対する深さと細胞密度の影響},
 volume = {26},
 year = {2010}
}