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Topic: Cone cell


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Eye

In the News (Thu 27 Jun 19)

  
  Cone cell - Wikipedia, the free encyclopedia
Cone cells, or cones, are cells in the retina of the eye which only function in relatively bright light.
Cones are less sensitive to light than the rod cells in the retina (which support vision at low light levels), but allow the perception of color.
Neither rods nor cones divide, but their membranous disks wear out and are sloughed off at the end of the outer segment, to be consumed and recycled by phagocytic cells.
en.wikipedia.org /wiki/Cone_cell   (830 words)

  
 Interactive Fly, Drosophila
The rhabdomeres of the cells R1–R6 are arranged in an asymmetric trapezoidal manner and extend the length of the retina.
The cone cells extend into thin bag-like structures between the R cells and terminate at the floor of the retina where their feet contribute to the formation of the fenestrated basement membrane.
This mispositioning of the R cells may be due to the defects in the fenestrated basement membrane caused by the abnormal number and organization of the cone cells and the disorganized pigment cell lattice (Shamloula, 2002).
www.sdbonline.org /fly/hjmuller/rugose1.htm   (3493 words)

  
 Photoreceptor cell: Facts and details from Encyclopedia Topic   (Site not responding. Last check: 2007-11-05)
In cone cells there are different types of opsins that combine with retinal to form pigments called photopsin[For more, click on this link]s.
As a part of the retina, the bipolar cell exists between photoreceptors (rod_cellrod cells and cone cells) and ganglion cellganglion cells....
The retina is a thin layer of cells at the back of the eyeball of vertebrates and some cephalopods; it is the part of the eye which transduces light...
www.absoluteastronomy.com /encyclopedia/p/ph/photoreceptor_cell.htm   (572 words)

  
 Color - Wikipedia, the free encyclopedia
The term "red cones" for the long-wavelength cones is deprecated as this type is actually maximally responsive to light we perceive as greenish, albeit longer wavelength light than that which maximally excites the mid-wavelength/"green" cones.
The sensitivity curves of the cones are roughly bell-shaped, and overlap considerably.
Note that the color experience of a given light mixture may vary with absolute luminosity, because both rods and cones are active at once in the eye, with each having different color curves, and rods taking over gradually from cones as the brightness of the scene is reduced.
en.wikipedia.org /wiki/Color   (3813 words)

  
 Cone <-> Horizontal Cell Model   (Site not responding. Last check: 2007-11-05)
This page is intended to provide information about my cone-horizontal cell model, a neural circuit simulation that allows a user to construct a realistic biophysically-based model of an array of cones and two types of horizontal cells, and then run a physiology experiment on it.
Cones and gap junctions are homologously coupled by gap junctions which spread the neural signals but reduce noise.
The records are from a row of cones and horizontal cells along a radius from the central neurons underneath the stimulus.
bip.anatomy.upenn.edu /~rob/cone_hor.html   (268 words)

  
 Webvision:S-cone pathways
Cone mosaic in the fovea where the S-wave or blue cones are evident by size and density differences.
Intracellular recordings from H2 horizontal cells in monkey retina have proved conclusively that this horizontal cell is blue sensitive and an important element of the S-cone pathway in the primate retina (Dacey et al., 1996).
It has been demonstrated that horizontal cells produce negative feedback to cones (Baylor et al., 1971; Fuortes and Simon, 1974; Burkhardt, 1993) and are engaged in center surround generation in bipolar cells, and color opponent responses in horizontal cells of animals with good color vision (Fourtes and Simon 1974).
webvision.med.utah.edu /S-cone.html   (2049 words)

  
 cone (geometry) - Hutchinson encyclopedia article about cone (geometry)
The volume and surface area of a cone are given by formulae involving a few simple dimensions.
A right circular cone is generated by rotating an isosceles triangle about its line of symmetry.
The distance from the edge of the base of a cone to the vertex is called the slant height.
encyclopedia.farlex.com /cone+(geometry)   (234 words)

  
 Ying, Mol Vis 2000; 6:101-108.
At P21, cone cells were not observed in the remaining photoreceptor cells in the ONL of Tg98 mice (Figure 5).
The absence of cone cells in Tg98 mice was confirmed by immunostaining for GNAT2 and the morphological criteria based on the heterochromatin pattern of the cone cells and their laminate location in the outer nuclear layer of the retina.
Consistent with the cone cell distribution in mouse retina, the rod cell degeneration in Tg98 mice proceeding from the central retina to the peripheral retina.
www.molvis.org /molvis/v6/a14   (4067 words)

  
 Cone Cell Survival and Downregulation of GCAP1 Protein in the Retinas of GC1 Knockout Mice -- Coleman et al. 45 (10): ...
Cone Cell Survival and Downregulation of GCAP1 Protein in the Retinas of GC1 Knockout Mice -- Coleman et al.
Spatiotemporal analyses of cone cell survival in 4- and 6-month-old GC1 KO retina.
Cone cell survival in the WT retina is shown as 100%.
www.iovs.org /cgi/content/full/45/10/3397   (5156 words)

  
 Webvision: Cone pathways
In the human retina the common cone bipolar cells are, like the cat, classified not only by the nature of their synapses with cone pedicles, but also by which sublamina of the IPL their axons terminate in.
Thus, the negative feedback synapse of the horizontal cell to the cone photoreceptor at the ribbon triad synapse allows the larger receptive field of the horizontal cell network (horizontal cells are coupled in a syncytium across the retina by electrical synapses between neighboring cells.
Kaneko, A. (1970) Physiological and morphological identification of horizontal, bipolar and amacrine cells in goldfish retina.
www.webvision.med.utah.edu /cone.html   (2250 words)

  
 Cone cell - definition from Biology-Online.org
in cones the photopigment is in invaginations of the cell membrane of the outer segment.
cones are less sensitive to light than rods, and are differentially sensitive to particular wavelengths of light and therefore important for colour vision.
They provide vision with higher spatial and temporal acuity, and it is the combination of signals from cones with different pigments that facilitates colour vision.
www.biology-online.org /dictionary/Cone_cell   (171 words)

  
 Regulation of Structural Plasticity by Different Channel Types in Rod and Cone Photoreceptors -- Zhang and ...
A total of 880 cells in 14 cultures from three animals were analyzed in A and B, and a total of 250 cells in 10 cultures from one animal were analyzed in C and D.
Cone cells did not show a significant decrease of synaptophysin staining intensity in Nc-treated, Nc-removed, and Nc-remained groups as compared with the untreated group at both levels.
Rod and cone cells were identified by the presence and absence, respectively, of rod opsin antibody labeling.
www.jneurosci.org /cgi/content/full/22/16/7065   (8080 words)

  
 rugose (rg), a Drosophila A kinase Anchor Protein, Is Required for Retinal Pattern Formation and Interacts Genetically ...
cell, an equatorial cone cell, and a polar cone cell (Fig 2A).
The weakly staining cells in C are likely to represent residual cone cells in the mutant allele.
cell occupies the position of the cone cell and fails to differentiate.
www.genetics.org /cgi/content/full/161/2/693   (7094 words)

  
 Purification of Mammalian Cone Photoreceptors by Lectin Panning and the Enhancement of Their Survival in ...
cone cell cytoplasm in the pig retina (Figs.
Quantification of cone photoreceptors in PNA-lectin–panned retinal cells.
Muller cells are a preferred substrate for in vitro neurite extension by rod photoreceptor cells.
www.iovs.org /cgi/content/full/46/1/367   (4611 words)

  
 Excess cone cell proliferation due to lack of a functional NR2E3 causes retinal dysplasia and degeneration in rd7/rd7 ...
Excess cone cell proliferation due to lack of a functional NR2E3 causes retinal dysplasia and degeneration in rd7/rd7 mice -- Haider et al.
cells to a particular cell fate (7) and in evagination of the
24 Kelley, M.W., Turner, J.K. and Reh, T.A. (1995) Ligands of steroid/thyroid receptors induce cone photoreceptors in vertebrate retina.
hmg.oxfordjournals.org /cgi/content/full/10/16/1619   (4589 words)

  
 Interactive Fly, Drosophila
This suggests that the SME is sufficient for transcriptional regulation of shaven in cone cell precursors, and that SME-lacZ faithfully reflects this regulation (Flores, 2000).
To restrict the loss of Egfr function to the undifferentiated cells posterior to the furrow and cells that acquire their fates during the second phase of morphogenesis, a lz-Gal4 driver was used to express a dominant-negative form of Egfr.
This is an inductive rather than lateral inhibitory function of the N signaling pathway in cone cell development that has not been previously analyzed with molecular markers.
www.sdbonline.org /fly/neural/sparkln1.htm   (2981 words)

  
 Cones - EPA - Comprehensive Procurement Guidelines - Traffic Cones   (Site not responding. Last check: 2007-11-05)
[picture of four Cones: rubbery penile objects 1.5", 2.5" and 3.5" in length, with concave bases].
Funerary Cones Artifacts, often in a conical shape made of fired clay bearing stamped funerary text on
The ovule cone remains on the The cones of other New Zealand conifers are very tiny and reduced to a few
cone.okeysearch.com /?q=cone-cones   (237 words)

  
 In vivo analysis of a developmental circuit for direct transcriptional activation and repression in the same cell by a ...
to activate its expression in the nonneuronal cone cells in the
The homeodomain protein Cut is expressed specifically in the four cone cells in the eye (Blochlinger et al.
Fu, W. and Noll, M. The Pax2 homolog sparkling is required for development of cone and pigment cells in the Drosophila eye.
www.genesdev.org /cgi/content/full/17/7/838   (4103 words)

  
 Receptor
Specific structure of a sense organ that can be excited and is capable of receiving a stimulus and converting it into a nervous discharge.
A molecule inside or on the surface of a cell that binds to a specific substance and causes a specific physiologic effect in the cell.
In biology, receptors are often embedded in cell membranes (see transmembrane receptor).
www.websters-online-dictionary.com /definition/english/Re/Receptor.html   (1347 words)

  
 Regulation of cone cell formation by Canoe and Ras in the developing Drosophila eye -- Matsuo et al. 124 (14): 2671 -- ...
Regulation of cone cell formation by Canoe and Ras in the developing Drosophila eye -- Matsuo et al.
Regulation of cone cell formation by Canoe and Ras in the developing Drosophila eye
Cone cells are lens-secreting cells in ommatidia, the unit eyes that
dev.biologists.org /cgi/content/abstract/124/14/2671   (812 words)

  
 Halfbakery: Cell Phone Cone of Silence
A simple clip-on device for a mobile phone, with a shield to hide the mouth (so no one can read the speaker's lips) and sound-damping technology to muffle the speaker's voice beyond it.
The inspiration for this was watching someone standing in the street speaking in muffled tones into her cell phone and shielding her mouth from view.
Whether you also want to squeal on the Mob while standing in Grand Central depends on whether you believe in hiding things in plain sight.
www.halfbakery.com /idea/Cell_20Phone_20Cone_20of_20Silence   (300 words)

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