Definitions
from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The pigment sensitive to red light in the retinal rods of the eyes, consisting of opsin and retinene. Also called visual purple.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A light-sensitive pigment in the rod cells of the retina; it consists of an opsin protein bound to the carotenoid retinal
from the GNU version of the Collaborative International Dictionary of English
- n. The visual purple. See under visual.
from The Century Dictionary and Cyclopedia
- n. Visual purple; a pigment found in the outer segments of the retinal rods.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a red photopigment in the retinal rods of vertebrates; dissociates into retinene by light
Etymologies
Examples
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Another protein is rhodopsin, which is found in cells that make up the retina of the eye.
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The scientists were able to see previously unobserved changes in the structure of rhodopsin, which is a model for the ubiquitous G protein coupled receptors (GPCRs), heptahelical, transmembrane receptors found in eukaryotic cells.
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Saranak J, Patel N, Zarilli G, Okabe M, et al. (1984) A rhodopsin is the functional photoreceptor for phototaxis in the unicellular eukaryote
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Blurred vision can be a lack of a light sensitive pigment called rhodopsin, or visual purple, that’s composed of vitamin A and protein.
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This alters the way in which one of the proteins in the retina—rhodopsin, a pigment responsible for night vision as well as blue-green color vision—behaves.
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Deyes goes on to discuss rhodopsin before throwing this red hot pepper in the pot:
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De Santis says their retinal rhodopsin was destroyed.
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They have opsins that they use for both light detection (sensory rhodopsin-I and sensory rhodopsin-II) *and* photosynthesis without chlorophyll (bacteriorhodopsin and halorhodopsin).
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Surprisingly, it looks as if the critical light-sensitive protein at the centre of it all, rhodopsin, evolved from an ancestor in algae where it is used to calibrate light levels in photosynthesis.
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Some bacteria even use rhodopsin for a type of photosynthesis.
blafferty commented on the word rhodopsin
Disappointment! No visuals?
July 23, 2011
ruzuzu commented on the word rhodopsin
Visual purple.
August 12, 2010