Results 221 to 230 of about 7,150 (250)

Spectral Tuning of Rhodopsin and Visual Cone Pigments

Journal of the American Chemical Society, 2014
Retinal is the light-absorbing biochromophore responsible for the activation of vision pigments and light-driven ion pumps. Nature has evolved molecular tuning mechanisms that significantly shift the optical properties of the retinal pigments to enable their absorption of visible light.
Zhou, Xiuwen, Sundholm, Dage, Wesolowski, Tomasz A., Kaila, Ville R. I.   +3 more
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Cone Inputs in Macaque Primary Visual Cortex

Journal of Neurophysiology, 2004
To understand the role of primary visual cortex (V1) in color vision, we measured directly the input from the 3 cone types in macaque V1 neurons. Cells were classified as luminance-preferring, color-luminance, or color-preferring from the ratio of the peak amplitudes of spatial frequency responses to red/green equiluminant and to black/white ...
Elizabeth N, Johnson, Michael J, Hawken, Robert, Shapley   +2 more
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Visual Field Changes in Cone-Rod Degenerations

Archives of Ophthalmology, 1982
The visual field test results from 20 patients with con-rod degeneration (CRD) from all inheritance patterns were reviewed. Typical fundus findings of CRD included optic disc pseudoedema, temporal disc atrophy, parapapillary and disc telangiectasis, and few to no retinal pigmentary deposits.
H R, Krauss, J R, Heckenlively
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Cone Trees

Proceedings of the SIGCHI conference on Human factors in computing systems Reaching through technology - CHI '91, 1991
The task of managing and accessing large information spaces is a problem in large scale cognition. Enwrging technologies for 3D visualization and interactive aninlaiion offer potential solutions to this problenl, especially when the structure of the information can be visualized. We describe one of these Information Visualtzaiion techniques, called the
George G. Robertson, Jock D. Mackinlay, Stuart K. Card   +2 more
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Vitamin A Metabolism in Rod and Cone Visual Cycles

Annual Review of Nutrition, 2012
The chromophore of all known visual pigments consists of 11-cis-retinal (derived from either vitamin A1 or A2) or a hydroxylated derivative, bound to a protein (opsin) via a Schiff base. Absorption of a photon results in photoisomerization of the chromophore to all-trans-retinal and conversion of the visual pigment to the signaling form.
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Studies on the Stability of the Human Cone Visual Pigments^†

Photochemistry and Photobiology, 2009
AbstractThe retina of vertebrates contains two kinds of photoreceptor cells, rods and cones, which contain their specific visual pigments that are responsible for scotopic and photopic vision, respectively. In cone photoreceptor cells, there are three types of color pigments: blue, green and red, each with a distinctive absorption maximum.
Eva, Ramon, Xiang, Mao, Kevin D, Ridge
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Cone structure and visual pigment content in the retina of the goldfish

Vision Research, 1976
Abstract Histologic examination of the retina in comet goldfish 11 cm long (nose to base of tail) reveals at least six distinct varieties of cones. Unequal double cones (DC) comprise long (LD) and short (SD) members which differ in form as well as length. Long single (LS) cones are similar in length and form to SD cones.
W K, Stell, F I, Hárosi
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Infant cone morphology and visual acuity

Optical Society of America Annual Meeting, 1992
Infant visual performance is much worse than that of adults. According to one account,1 the striking morphological immaturity of infant foveal cones contributes directly to the poor vision of infants. This explanation depends on the assumption that infants use their immature foveal cones to control visual performance. In another account,2 immaturity of
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The Cone Of Vision: A new Technique for Interactive Scientific Visualization

1993
A new algorithm is proposed for interactive visualization of large 3D timedependent datasets. The idea is to process only the part of the data which is actually seen by the observer’s eye i.e. the Cone Of Vision (COV). This technique improves interactivity and limits memory requirements since only the COV is stored in the core memory.
Dominique Astruc, Alain Vincent
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Variations in cone photoreceptor abundance and the visual ecology of birds

Journal of Comparative Physiology A: Sensory, Neural, and Behavioral Physiology, 2001
The relative abundance and topographical distribution of retinal cone photoreceptors was measured in 19 bird species to identify possible correlations between photoreceptor complement and visual ecology. In contrast to previous studies, all five types of cone photoreceptor were distinguished, using bright field and epifluorescent light microscopy, in ...
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