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Indecisive behavior of amoeba crossing an environmental barrier

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タイトル: Indecisive behavior of amoeba crossing an environmental barrier
著者: Takagi, S. 著作を一覧する
Nishiura, Y. 著作を一覧する
Nakagaki, T. 著作を一覧する
Ueda, T. 著作を一覧する
Ueda, K.-I. 著作を一覧する
発行日: 2007年 6月
出版者: World Scientific Publishing
誌名: Topological Aspects of Critical Systems and Networks : Proceedings of the International Symposium
開始ページ: 86
終了ページ: 93
抄録: We report here a new kind of behavior that seems to be 'indecisive' in an amoeboid organism, the Physarum plasmodium of true slime mold. The plasmodium migrating in a narrow lane stops moving for a period of time (several hours but the duration differs for each plasmodium) when it encounters the presence of a chemical repellent, quinine. After stopping period, the organism suddenly begins to move again in one of three different ways as the concentration of repellent increases: going through the repulsive place (penetration), splitting into two fronts of going throught it and turning (splitting) and turning back (rebound). In relation to the physiological mechanism for tip migration in the plasmodium, we found that the frontal tip is capable of moving further although the tip is divided from a main body of organism. This means that a motive force of front locomotion is produced by a local process at the tip. Based on this finding, a mathematical model for front locomotion is considered in order to understand the dynamics for both the long period of stopping and three kinds of behavior. A model based on reaction-diffusion equations succeeds to reproduce the experimental observation. The origin of long-time stopping and three different outputs may be reduced to the hidden instabilities of internal dynamics of the pulse, which may be a skeleton structure extracted from much more complex dynamics imbedded in the Physarum plasmodium.
記述: International Symposium on "Topological Aspects of Critical Systems and Networks". 13-14 February 2006. Hokkaido University, Sapporo, JAPAN.
資料タイプ: proceedings (author version)
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 西浦 廉政


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