| 释义 |
rhodopsin Biochem.|rəʊˈdɒpsɪn|
[a. G. rhodopsin (Ewald & Kühne 1878, in Untersuchungen aus d. physiol. Inst. d. Univ. Heidelberg I. 181), f. rhod-o rhodo- + Gr. ὄψ-ις sight, vision + -in -in1.]
The brilliant purplish-red light-sensitive pigment found in the retina of man and most other animal species, which consists of a protein (opsin) bonded to a prosthetic group (retinal) which is ultimately liberated by the action of light in the photochemical process of vision; = visual purple s.v. visual a. and n.
1886Jrnl. Chem. Soc. L. 375 After a frog has been poisoned by pilocarpin, the regeneration of rhodopsin in the dark after exposure to light is hastened. 1937Nature 12 June 1018/1 In every detail so far examined, the porphyropsin system faithfully reproduces the behaviour of the rhodopsin system, but with quite different components. 1959S. Duke-Elder Parsons' Dis. Eye (ed. 13) iii. 26 Rhodopsin is a chromoprotein, the molecule of which consists of a reactive part, a chromophore, responsible for the preferential absorption of light, attached to a protein which acts essentially as a support. 1967New Scientist 9 Feb. 330/2 Rhodopsin, the pigment of the retinal cones, has its absorption maximum at a wavelength of 5550 angstroms. 1968M. Pyke Food & Society vii. 93 One of the chemical functions of vitamin A is known to be the re-conversion of the retinal pigment, rhodopsin [printed rhodospin], which becomes bleached in bright light, to its receptive state as visual purple. 1976Sci. Amer. July 108/1 In all animals, invertebrates and vertebrates alike, the visual pigment rhodopsin is present in the photoreceptor membrane of the visual cells. |