positive phototaxis

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• 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

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

• Phototaxis — Phototaxis, durch Lichtreize ausgelöste ⇒ Taxis vieler autotropher Algen und einiger heterotropher Einzeller. Die Bewegung ist häufig zum Licht hin gerichtet (positive P.), bei sehr hoher Lichtintensität bisweilen vom Licht weg (negativer P.).… …   Deutsch wörterbuch der biologie

• 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

• 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… …   The Collaborative International Dictionary of English

• 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

• 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