negative phototaxis
Phototaxis Pho`to*tax"is, Phototaxy Pho"to*tax`y, n. [NL. phototaxis; photo- + Gr. ? an arranging.] (Biol.) The influence of light on the movements of low organisms, as various infusorians, the zo["o]spores of certain alg[ae], etc.; also, the tendency to follow definite directions of motion or assume definite positions under such influence. If the migration is toward the source of light, it is termed

{positive phototaxis}; if away from the light,

{negative phototaxis}. -- {Pho`to*tac"tic}, a. -- {Pho`to*tac"tic*al*ly}, adv. [Webster 1913 Suppl.]


The Collaborative International Dictionary of English. 2000.

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  • Phototaxis — Pho to*tax is, Phototaxy Pho to*tax y, n. [NL. phototaxis; photo + Gr. ? an arranging.] (Biol.) The influence of light on the movements of low organisms, as various infusorians, the zo[ o]spores of certain alg[ae], etc.; also, the tendency to… …   The Collaborative International Dictionary of English

  • Phototaxis — Als Phototaxis wird eine durch Unterschiede der Beleuchtungsstärke (Beleuchtungsstärkengradient) in ihrer Richtung beeinflusste Fortbewegung von Organismen bezeichnet. Dabei unterscheidet man die positive Phototaxis (Bewegung in Richtung höherer… …   Deutsch Wikipedia

  • Phototaxis — is a kind of taxis that occurs when a whole organism moves in response to the stimulus light. This is advantageous for phototrophic organisms as they can orient themselves most efficiently to receive light for photosynthesis. Phototaxis is called …   Wikipedia

  • phototaxis — [fōt΄ō tak′sis] n. [ModL: see PHOTO & TAXIS] the positive, or negative, response of a freely moving organism toward, or away from, light phototactic [fōt΄ōtik] adj …   English World dictionary

  • phototaxis — Movement of a cell or organism towards (positive phototaxis) or away from (negative p.) a source of light …   Dictionary of molecular biology

  • phototaxis — Reaction of living protoplasm to the stimulus of light, involving bodily motion of the whole organism toward (positive p.) or away from (negative p.) the stimulus. Cf.:phototropism. [photo + G. taxis, orderly arrangement] * * * pho·to·tax·is tak …   Medical dictionary

  • positive phototaxis — Phototaxis Pho to*tax is, Phototaxy Pho to*tax y, n. [NL. phototaxis; photo + Gr. ? an arranging.] (Biol.) The influence of light on the movements of low organisms, as various infusorians, the zo[ o]spores of certain alg[ae], etc.; also, the… …   The Collaborative International Dictionary of English

  • Phototactic — Phototaxis Pho to*tax is, Phototaxy Pho to*tax y, n. [NL. phototaxis; photo + Gr. ? an arranging.] (Biol.) The influence of light on the movements of low organisms, as various infusorians, the zo[ o]spores of certain alg[ae], etc.; also, the… …   The Collaborative International Dictionary of English

  • Phototactically — Phototaxis Pho to*tax is, Phototaxy Pho to*tax y, n. [NL. phototaxis; photo + Gr. ? an arranging.] (Biol.) The influence of light on the movements of low organisms, as various infusorians, the zo[ o]spores of certain alg[ae], etc.; also, the… …   The Collaborative International Dictionary of English

  • Phototaxy — Phototaxis Pho to*tax is, Phototaxy Pho to*tax y, n. [NL. phototaxis; photo + Gr. ? an arranging.] (Biol.) The influence of light on the movements of low organisms, as various infusorians, the zo[ o]spores of certain alg[ae], etc.; also, the… …   The Collaborative International Dictionary of English

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