Results 251 to 260 of about 85,236 (300)
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Microspectrophotometry of visual pigments
Quarterly Reviews of Biophysics, 1972Visual pigments are embedded in the disc membranes of the outer segments of vertebrate rods and cones and in the microvilli of invertebrate visual cells. The pigment molecule in both is a most fascinating aggregate of known (the ubiquitous II-cisisomer of vitamin A1or A2-aldehyde = retinal1or2; Hubbard & Wald, 1952) covalently bonded to the unknown
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Visual pigments and visual range underwater
Vision Research, 1968Abstract In shallow water the spectral radiance of a grey object differs from that of the water background spacelight. The spectral absorbance of the visual pigments present in the eye will therefore affect the perceived contrast between an object and its water background, and hence the range at which the object can be seen underwater.
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Molecular Biology of Visual Pigments
Annual Review of Neuroscience, 1987We have witnessed exciting advances in the study of vision over the past several years. In particular, our understanding of the biochemical events responsible for visual transduction has grown enormously. By visual trans duction we mean those events within the retinal photoreceptor cell that convert a photon stimulus into a neural signal.
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THE VISUAL PIGMENT CYANIDE EFFECT
Photochemistry and Photobiology, 1989Abstract— The visual pigment of the Tokay gecko (Gekko gekko) with its in situ absorption maximum at 521 nm has its spectral position at 500 to 505 nm when chloride‐deficient digitonin is used for the extraction. In this case the addition of chloride or bromide to the extract restores the maximum to 521 nm.
F, Crescitelli, B, Karvaly
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Wavelength regulation in visual pigments
Experimental Eye Research, 1973Abstract Two of the primary spectroscopic problems associated with visual pigments are the mechanism of the bathochromic shift and the mechanism(s) of pigment wavelength regulation. The bathochromic shift problem has to do with understanding the way in which the Schiff base of retinal (which absorbs at about 365 nm) can be made to absorb light in the
P E, Blatz, P A, Liebman
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Resonance Raman Studies of Visual Pigments
Annual Review of Biophysics and Bioengineering, 1977Visual pigments are composed of a small chromophore (absorption center) called retinal (the aldehyde of vitamin A) covalently linked to surrounding protein, called opsin. The pigments are situated in specialized membranes. The best studied, rhodopsin, is found in velebrate rods, the cells of the retina responsible for low light level vision as opposed ...
Robert Callender, Barry Honig
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1995
Abstract The chemical structures of the carotenoids, chlorophylls, phytochromes, flavins, and other accessory pigment molecules were previously described in Chapter 3. In discussing non-imaging system phototropism and phototaxis, it was indicated that a retinal-protein, the visual pigment rhodopsin, was one of the photoreceptor pigment ...
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Abstract The chemical structures of the carotenoids, chlorophylls, phytochromes, flavins, and other accessory pigment molecules were previously described in Chapter 3. In discussing non-imaging system phototropism and phototaxis, it was indicated that a retinal-protein, the visual pigment rhodopsin, was one of the photoreceptor pigment ...
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Visual pigments and the acquisition of visual information
Journal of Experimental Biology, 1989ABSTRACT All the information available to the brain for the interpretation of the visual scene comes from the number of photons absorbed by a very limited number of photoreceptor types which are characterized by their spectral sensitivity.
Lythgoe, JN, Partridge, JC
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Experimental Eye Research, 1974
Abstract Rod visual pigments exhibit a variety of absorption maxima, determined partly by the nature of the prosthetic group, retinal or 3-dehydroretinal, and partly by the apoprotein opsin. Some animal taxa exhibit little diversity. On the other hand, selective pressures arising from the different light habitats of aquatic environments are believed ...
C.D.B. Bridges, C.E. Delisle
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Abstract Rod visual pigments exhibit a variety of absorption maxima, determined partly by the nature of the prosthetic group, retinal or 3-dehydroretinal, and partly by the apoprotein opsin. Some animal taxa exhibit little diversity. On the other hand, selective pressures arising from the different light habitats of aquatic environments are believed ...
C.D.B. Bridges, C.E. Delisle
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Photophysiological functions of visual pigments
Advances in Biophysics, 1984In order to gain a fundamental understanding of functions of a visual pigment, i.e., photoreception and phototransduction, it is essential to elucidate the molecular structure of visual pigment, its photochemical behavior and connection of the pigment to the molecular physiological amplification mechanism for excitation of a visual cell. A rhodopsin, a
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