翻訳と辞書 Words near each other ・ Photosynthesis ・ Photosynthesis system ・ Photosynthetic (album) ・ Photosynthetic capacity ・ Photosynthetic efficiency ・ Photosynthetic picoplankton ・ Photosynthetic pigment ・ Photosynthetic reaction centre ・ Photosynthetic reaction centre protein family ・ Photosynthetic state transition ・ Photosynthetically active radiation ・ Photosystem ・ Photosystem I ・ Photosystem II ・ Photosystem II light-harvesting protein ・ Phototaxis ・ Phototendering ・ Phototheca ・ Phototherapeutic keratectomy ・ Photothermal effect ・ Photothermal microspectroscopy ・ Photothermal optical microscopy ・ Photothermal spectroscopy ・ Photothermal therapy ・ Photothèque (Luxembourg) ・ PhotoToMovie ・ Phototool ・ Phototoxic tar dermatitis ・ Phototoxicity ・ Phototoxin Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Phototaxis ： ウィキペディア英語版 Phototaxis Phototaxis is a kind of taxis, or locomotory movement, that occurs when a whole organism moves towards or away from stimulus of light. This is advantageous for phototrophic organisms as they can orient themselves most efficiently to receive light for photosynthesis. Phototaxis is called positive if the movement is in the direction of increasing light intensity and negative if the direction is opposite. Two types of positive phototaxis are observed in prokaryotes. The first is called scotophobotaxis (from the word "scotophobia"), which is observed only under a microscope. This occurs when a bacterium swims by chance out of the area illuminated by the microscope. Entering darkness signals the cell to reverse flagella rotation direction and reenter the light. The second type of phototaxis is true phototaxis, which is a directed movement up a gradient to an increasing amount of light. This is analogous to positive chemotaxis except that the attractant is light rather than a chemical. Phototactic responses are observed in many organisms such as ''Serratia marcescens'', ''Tetrahymena'', and ''Euglena''. Each organism has its own specific biological cause for a phototactic response, many of which are incidental and serve no end purpose. ==See also== *Phototropism 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Phototaxis」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.