Results 121 to 130 of about 1,619 (156)
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Photopigments of the lateral eye ofLimulus
Journal of Comparative Physiology ? A, 1976Photoreceptor membrane fractions of the lateral eye ofLimulus were solubilized in the detergent emulphogene, and three photobleachable materials were observed with respectiveλ max values at 330nm±10nm, 450 nm±10 nm, and 530 nm±10 nm. A530 is the pigment which had been reported earlier by Hubbard and Wald (1960), and it can be separated from A330 and ...
R. M. Benolken +2 more
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The effect of controlled photopigment excitations on pupil aperture
Ophthalmic and Physiological Optics, 2010Abstract In addition to rods and cones, the human retina contains melanopsin which has been identified recently in the body and dendrites of a few ganglion cells. The intrinsically photosensitive retinal ganglion cells (ipRGCs) are good candidates for controlling the tonic pupil aperture but their spectral sensitivity is close to ...
Françoise, Viénot +2 more
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Derivation of the photopigment absorption spectra in anomalous trichromats*
Journal of the Optical Society of America, 1973We describe a method of deriving the absorption curves of the anomalous pigments of sex-linked anomalous color vision. The approach is based on combining Rayleigh-equation data with standard shapes for the visual pigments. For normal pigments, we used a standard shape derived from corrected dichromatic sensitivity curves, with λmax = 534 and 560 nm for
J, Pokorny, V C, Smith, I, Katz
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The effects of photopigment depletion on brightness and threshold
Vision Research, 1978Abstract Viewing an intense light depletes the store of regenerated photopigment within the receptors, thereby reducing the proportion of quanta in a subsequent stimulus that can be absorbed by the regenerated photopigment. This effect of photopigment depletion is often thought to play an insignificant role in the adaptation process.
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Melanopsin Forms a Functional Short-Wavelength Photopigment
Biochemistry, 2003Recently, melanopsin has emerged as the leading candidate for the elusive photopigment of the mammalian circadian system. This novel opsin-like protein is expressed in retinal ganglion cells that form the retinohypothalamic tract, a neuronal connection between the retina and the suprachiasmatic nucleus.
Lucy A, Newman +4 more
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The Evolution of Invertebrate Photopigments and Photoreceptors
2014The advent of new tools in genetics, labeling, and imaging has led to a revolution in the ability to investigate the genetic and cellular evolution of invertebrate photoreceptor pigments and cells. All opsins, invertebrate and vertebrate, derive from a common ancestral G-protein-coupled receptor, whose descendants form four distinct groups (one of ...
Thomas W. Cronin, Megan L. Porter
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Photopigments des cônes humains
Documenta Ophthalmologica, 1969On propose l'hypothese que les trois pigments photosensibles des cones de la retine humaine obeissent a la regle de Dartnall, c'est a dire que les courbes de leurs spectres d'action sont identiques a une translation pres, parallelement a l'axe des abscisses, quand celui-ci est gradue en frequences. Cette hypothese semble en bon accord avec l'experience
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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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Photopigments in anomalous trichromats*
Journal of the Optical Society of America, 1975Joel Pokorny +2 more
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