منابع مشابه
Saturation in human cones.
Increment threshold intensities were measured for a foveally presented 20msec test flash which fell on a gashed 4.1” white background field. The test field was varied in color (red or green) and size (1” or 0.57”). In one condition (green 0.57” test) the onset asynchrony of the background and test fields was also varied. The increment threshold measurements directly demonstrate saturation of th...
متن کاملSpectra of human L cones
Variations in the amino acid sequences of the human cone opsins give rise to spectrally variant subtypes of L and M cone pigments even in the population with normal color vision. In vitro mutagenesis studies have shown that a limited number of amino acid substitutions produce shifts in the wavelength sensitivity. Presented here are results comparing electrophysiological measurements of single h...
متن کاملOptical fiber properties of individual human cones.
The tuning properties of the ensemble of cone photoreceptors is due to the tuning properties of individual cones convolved with the disarray in pointing direction between the cones. We used direct imaging with the Rochester adaptive optics ophthalmoscope to directly image these properties in individual cones in living human eyes. We found that cone disarray is very small, accounting for less th...
متن کاملSpectral sensitivities of the human cones.
Transient chromatic adaptation produced by an abrupt change of background color permits an easier and closer approach to cone isolation than does steady-state adaptation. Using this technique, we measured middle-wave-sensitive (M)-cone spectral sensitivities in 11 normals and 2 protanopes and long-wavelength-sensitive (L-) cone spectral sensitivities in 12 normals and 4 deuteranopes. Although t...
متن کاملEffect of Different Tapered Gutta Percha Cones in Apical Microleakage of Human Root Canal Obturation
Background and purpose: Gutta-percha is generally accepted as the main canal filler. Standard gutta-percha cones are available in 2-10% tapers. The purpose of this study was to compare apical microleakage of canals obturated with different tapers of gutta-percha, using the protein penetration technique. Materials and methods: In this study, 96 maxillary anterior teeth were selected and were pr...
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ژورنال
عنوان ژورنال: Science
سال: 1964
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.145.3637.1205