Results 181 to 190 of about 8,717 (203)
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Photopigments and photoentrainment in the Syrian golden hamster
Brain Research, 1997The Syrian golden hamster (Mesocricetus auratus) is an important model in the study of circadian rhythms. However, as in other mammals, little is known about the photoreceptors that mediate circadian entrainment. Using immunocytochemistry and RNA blot hybridization, we found no evidence for the presence of blue-/UV-sensitive opsin.
M, von Schantz +3 more
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Foveal cone photopigment bleaching in central serous retinopathy
Applied Optics, 1988Color-matching techniques were used to follow the course of central serous retinopathy in thirteen patients. During periods of neurosensory detachment?, cone optical densities were low. In some patients optical densities remained low following clinical resolution of the disease.
S A, Burns, A E, Elsner, L A, Lobes
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Immunocytochemical localization of photopigments in cephalopod retinae
Journal of Neurocytology, 1987The photopigments, rhodopsin and retinochrome, have been localized in cephalopod retinae using light and electron microscopic immunocytochemical methods. Polyclonal antibodies prepared against squid opsin demonstrated the presence of this protein in the photoreceptor rhabdomes, Golgi zone, Golgi-associated vesicles, plasma membrane, large cytoplasmic ...
L J, Robles +4 more
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Visual Photopigment Evolution in Speciation
2014Visual pigment sensitivities are known to vary across organisms and habitats. The sensory drive theory was formulated over 20 years ago to help explain how such sensory variation could contribute to divergent selection and speciation. Since then, there have been only a few examples that support the idea that visual pigment evolution contributes to ...
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Photoproducts of retinal photopigments and visual adaptation
Vision Research, 1972Abstract A five-component cyclic model of photopigment kinetics has been used to compute photochemical changes corresponding to experimental studies of rod adaptation in the rat and in man. It is noted that a simple relationship between rhodopsin photoproducts and visual threshold permits a consistent description of rod adaptation with or without a ...
M A, Mainster, T J, White
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Photopigment content of isolated bovine disk membrane vesicles
Analytical Biochemistry, 1981Abstract Rod outer segment disk membranes are isolated from dark-adapted frozen bovine retinae, osmotically swollen into spherical vesicles, and their photopigment content is determined. The size and shape of the vesicles are deduced from elastic and quasielastic light scatterings, the vesicle number density by viscometry, and the photopigment ...
E J, Amis, D A, Davenport, H, Yu
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The Photopigments in an Insect Retina
1973Colour vision is not an exclusive property of vertebrates. Also insects can discriminate wavelengths. The best known example is the honeybee, as shown by training experiments (1) and electrophysiological recordings (2,3). The peripheral wavelength discrimination is accomplished by at least three receptor types. The spectral sensitivity of the receptors
G. Höglund +4 more
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Photopigments and the dimensionality of animal color vision
Neuroscience & Biobehavioral Reviews, 2018Early color-matching studies established that normal human color vision is trichromatic. Subsequent research revealed a causal link between trichromacy and the presence in the retina of three classes of cone photopigments. Over the years, measurements of the photopigment complements of other species have expanded greatly and these are frequently used ...
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Photopigments in anomalous trichromats*
Journal of the Optical Society of America, 1975Joel Pokorny +2 more
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