… There are two types of locomotion: passive, riding on air or water currents, and active, using locomotor organs. The latter is called locomotion, and is a special category of locomotion. However, as can be seen in the examples of pelagic fish that ride ocean currents and the hairs on dandelion seeds, this distinction between locomotion methods is not essential to locomotion. … From [Exercise]…However, before the formation of the fruiting body, all cells are amoeboid and move while forming pseudopodia. The directional chemotactic movement seen when amoebae gather and the polarized movement of multicellular bodies occur based on the unidirectional formation of pseudopodia in amoebae. The basic mechanism of cell movement in this case is thought to be not very different from that of non-muscle cells in animals, but there are still many unknowns, except that several chemotactic substances, including cyclic AMP, have been identified and their initial reactions have been somewhat clarified. … *Some of the terminology that refers to "locomotion" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… 生物の移動には,気流や水流に乗っての受動的消極的なものと,運動器官を用いての積極的なものとがある。後者は移動運動locomotionと呼ばれ,運動の中の特別な1区分をなす。しかし,海流に乗って泳ぐ遠洋魚やタンポポの種子の毛といった例に見られるように,このような移動方式の区別は移動にとって本質的な意義をもつものではない。… 【運動】より…しかし,子実体形成以前においてはすべての細胞はアメーバ状であって,仮足を形成しながら運動する。アメーバの集合時に見られる指向的な走化性運動および多細胞体の極性的な移動運動,これらはアメーバの仮足の一方向的な形成に基づいて起こる。この場合の細胞運動の基礎機構は,動物の非筋肉細胞のそれと大差ないと考えられるが,環状AMPをはじめとする走化性物質がいくつか同定されその初期反応が若干明らかにされていることを除けば,まだ不明な点が多い。… ※「移動運動」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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