Results 271 to 280 of about 265,631 (295)
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Visual Pigment Density in Single Primate Foveal Cones
Science, 1969The feasibility is demonstrated of microspectrophotometric studies on primate photoreceptors aligned at right angles to the test beam, rather than axially illuminated. Pigment densities, and hence absorption per unit thickness, are approximately equal in primate rods and foveal cones.
W H, Dobelle, W B, Marks, E F, MacNichol
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Rod and cone visual pigments in the goldfish
Vision Research, 1981Abstract This microspectrophotometric (MSP) study has confirmed that goldfish, acclimated under a certain light and temperature regimen, possess mixtures of porphyropsin and rhodopsin in their rod outer segments. Moreover, the MSP spectra from the red, green and blue cones of these acclimated goldfish also shifted to shorter wavelengths from spectra ...
A T, Tsin +3 more
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Infant cone morphology and visual acuity
Optical Society of America Annual Meeting, 1992Infant 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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Visual Pigments, Blue Cone Monochromasy, and Retinitis Pigmentosa
Archives of Ophthalmology, 1990In a recent publication, Dryja and colleagues 1 reported a point mutation of the rhodopsin gene in one form of retinitis pigmentosa (RP). The mutation, a cytosine-to-adenine base transversion, results in the substitution of histidine (His) for proline (Pro) at position 23 of the rhodopsin protein.
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Cone antagonism along visual pathways of red/green dichromats
Vision Research, 1985We have measured thresholds for bichromatic test-mixtures in red/green dichromats. Our results provide strong evidence for cone-antagonistic coding along the dichromats' detecting pathways. The threshold behavior of the isolated dichromatic pathways is consistent with that predicted by Opponent Colors Theory.
L J, Friedman, J E, Thornton, E N, Pugh
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Mutual rod–cone suppression within the central visual field
Ophthalmic and Physiological Optics, 1992Under mesopic conditions the contrast sensitivity of the central visual field is reduced as the result of a non‐linear interaction between rod‐ and cone‐mediated signals, each of which is capable of higher sensitivity in isolation. The interaction is produced only when the rod‐mediated system is driven at flicker rates above 6 Hz.
R F, Hess, K T, Mullen, K, Nordby
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Phosphorylation of iodopsin, chicken red-sensitive cone visual pigment
Biochemistry, 1990The amino acid sequence has been determined for the carboxyl-terminal 41 amino acids of chicken red-sensitive cone pigment, iodopsin. This sequence is distinct from but structurally homologous to that of other visual pigments. It contains a region rich in the hydroxy amino acids serine and threonine.
Y, Fukada +7 more
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Two different visual pigments in one retinal cone cell
Neuron, 1994The retina of the mouse, rabbit, and guinea pig is divided into a superior area dominated by green-sensitive (M) cones and an inferior area in which cones possess practically only short wavelength-sensitive (S) photopigments. The present study shows that the transitional zone between these retinal areas is populated by cones labeled by both the M and S
P, Röhlich, T, van Veen, A, Szél
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Rod- and cone-mediated visual function in multiple sclerosis
Journal of the Neurological Sciences, 1982Visual thresholds and perceptual latencies were determined in patients with multiple sclerosis (MS) and in normal control subjects. Measurements were made under light- and dark-adapted conditions, with stimuli chosen to stimulate rod and cone receptors selectively.
Patterson, V. H. +2 more
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