| 释义 |
phototactic, a. Biol.|fəʊtəʊˈtæktɪk|
[ad. G. phototaktisch (E. Strasburger 1878: see phototaxis), f. Gr. ϕῶς light, photo- 1 + τακτικ-ός fit for ordering or arranging.]
Exhibiting or characterized by phototaxis.
1882S. H. Vines tr. F.G.J. von Sachs's Text-bk. Bot. iii. iii. 752 Zoogonidia which exhibit these phenomena are said, by Strasburger, to be phototactic. 1885Encycl. Brit. XIX. 62/1 Protoplasmic masses which respond to the directive action of light are said to be ‘phototactic’. 1901G. N. Calkins Protozoa 296 The most phototactic forms are the flagellated cells. 1907Jrnl. Exper. Zool. V. 72 Any organism is said to be positively phototactic when it moves towards the source of light and negatively phototactic when it goes in the opposite direction. 1969F. E. Round Introd. Lower Plants ii. 15 Euglenoids are positively phototactic. 1976Sci. Amer. June 42/1, I had noticed a phototactic response in H. halobium; the cells reversed their direction of swimming when the intensity of illumination was decreased in the red part of the spectrum.
Hence photoˈtactically adv.
1914[see kinetic a. 2 b]. |