Results 151 to 160 of about 5,597,978 (191)
Some of the next articles are maybe not open access.
Visual Pigments of Single Primate Cones
Science, 1964Single parafoveal cones from human and monkey retinas were examined in a recording microspectrophotometer. Three types of receptors with maximum absorption in the yellow, green, and violet regions of the spectrum were found. Thus the commonly held belief, for which there has previously been no direct and unequivocal evidence, that color vision is ...
W B, MARKS, W H, DOBELLE, E F, MACNICHOL
openaire +2 more sources
A visual nonlinearity fed by single cones
Vision Research, 1992An intensive nonlinearity in the visual system can produce distortion products, or difference frequency gratings, when observers view two high contrast, high spatial frequency interference fringes of slightly different frequency or orientation added together at the retina.
D I, MacLeod, D R, Williams, W, Makous
openaire +2 more sources
Study on the acceleration of single‐cone PDC composite bit
Mathematical Methods in the Applied Sciences, 2021The single‐cone bit has become the first choice for slim hole sidetracking and deep well drilling with its unique rock breaking method and high ROP (rate of penetration). The single‐cone bits currently used in the oil field all use cemented carbide inserts, with its main failure mode being of early excessive wear of the cutting teeth.
Chunyan Kong +5 more
openaire +2 more sources
Spectral response curves of single cones in the carp
Vision Research, 1967Abstract Single cone spectral response curves were obtained with the aid of specially designed equipment. Statistical analysis of 142 records selected from hundreds, based solely on the greatest signal-to-noise ratio, revealed three groups of cones; the red cones (74 per cent) with the peaking wavelength at 611±23mμ, green cones (10 per cent) at 529 ...
T, Tomita +3 more
openaire +2 more sources
Quantitative Estimation of F-Actin in Single Growth Cones
Methods, 1999Growth cones at distal ends of elongating neurites are characterized by a bunch of motile filopodia. Filamentous actin (F-actin) is the supporting cytoskeletal structure of growth cone filopodia. Normal growth cone motility requires balanced polymerization and depolymerization rates of F-actin. If this balance is disturbed, growth cone shape is altered
Schindelholz B, Reber BF
openaire +3 more sources
Spectral sensitivity of single cones in the retina of Macaca fascicularis
Nature, 1984Colour vision depends on the wavelength-dependent absorptions of three different photolabile pigments each located in a particular type of retinal cone. The spectral absorption of primate cones has been examined by microspectrophotometry, but this method gives information only at wavelengths where the absorption is relatively strong.
B J, Nunn, J L, Schnapf, D A, Baylor
openaire +2 more sources
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
openaire +2 more sources
Sealing Properties of Two Contemporary Single-Cone Obturation Systems
International Endodontic Journal, 2007AbstractAim To compare the sealing of root canals filled with two single‐cone obturation systems and a warm vertical compaction technique.Methodology Forty‐two single‐rooted teeth were decoronated to obtain 17‐mm‐long root segments. The root canals were cleaned and shaped to size 40, 0.06 taper and filled with: (i) warm vertical compaction with AH ...
Marco Ferrari +2 more
exaly +3 more sources
Spatially resolving the cone of reaction for a single molecule
ScienceCollisions of atoms and molecules are required for bond formation and are thus key to any chemical reaction. Their outcome is determined by the collision energy, relative orientation, and impact parameter of the reactants. Collision studies in the gas phase have shown that energies are easily controlled, whereas it is difficult to steer the molecular ...
Matthew James Timm +6 more
openaire +2 more sources
Visual Neuroscience, 1993
AbstractWe investigated the attributes of transduction and light-adaptation in rods, single cones, and twin cones isolated from the retina of striped bass (Morone saxatilis). Outer-segment membrane currents were measured with suction electrodes under voltage clamp provided by tight-seal electrodes applied to the cell’s inner segment.
J L, Miller, J I, Korenbrot
openaire +2 more sources
AbstractWe investigated the attributes of transduction and light-adaptation in rods, single cones, and twin cones isolated from the retina of striped bass (Morone saxatilis). Outer-segment membrane currents were measured with suction electrodes under voltage clamp provided by tight-seal electrodes applied to the cell’s inner segment.
J L, Miller, J I, Korenbrot
openaire +2 more sources