Matches in DBpedia 2014 for { <http://dbpedia.org/resource/Photoreceptor_cell> ?p ?o. }
Showing items 1 to 59 of
59
with 100 items per page.
- Photoreceptor_cell abstract "A photoreceptor cell is a specialized type of neuron found in the retina that is capable of phototransduction. The great biological importance of photoreceptors is that they convert light (visible electromagnetic radiation) into signals that can stimulate biological processes. To be more specific, photoreceptor proteins in the cell absorb photons, triggering a change in the cell's membrane potential.The two classic photoreceptor cells are rods and cones, each contributing information used by the visual system to form a representation of the visual world, sight. The rods are narrower than the cones and distributed differently across the retina, but the chemical process in each that supports phototransduction is similar. A third class of photoreceptor cells was discovered during the 1990s: the photosensitive ganglion cells. These cells do not contribute to sight directly, but are thought to support circadian rhythms and pupillary reflex.There are major functional differences between the rods and cones. Rods are extremely sensitive, and can be triggered by as few as 6 photons. At very low light levels, visual experience is based solely on the rod signal. This explains why colors cannot be seen at low light levels: only one type of photoreceptor cell is active.Cones require significantly brighter light (i.e., a larger numbers of photons) in order to produce a signal. In humans, there are three different types of cone cell, distinguished by their pattern of response to different wavelengths of light. Color experience is calculated from these three distinct signals, perhaps via an opponent process. The three types of cone cell respond (roughly) to light of short, medium, and long wavelengths. Note that, due to the principle of univariance, the firing of the cell depends upon only the number of photons absorbed. The different responses of the three types of cone cells are determined by the likelihoods that their respective photoreceptor proteins will absorb photons of different wavelengths. So, for example, an L cone cell contains a photoreceptor protein that more readily absorbs long wavelengths of light (i.e., more "red"). Light of a shorter wavelength can also produce the same response, but it must be much brighter to do so.The human retina contains about 120 million rod cells and 6 million cone cells. The number and ratio of rods to cones varies among species, dependent on whether an animal is primarily diurnal or nocturnal. Certain owls, such as the tawny owl, have a tremendous number of rods in their retinae. In addition, there are about 1.5 million ganglion cells in the human visual system, 1 to 2% of them photosensitive.Described here are vertebrate photoreceptors. Invertebrate photoreceptors in organisms such as insects and molluscs are different in both their morphological organization and their underlying biochemical pathways.".
- Photoreceptor_cell thumbnail 1414_Rods_and_Cones.jpg?width=300.
- Photoreceptor_cell wikiPageExternalLink search.php?q=Photoreceptor%20Cell&t=data&s=cover&b=0&r=20.
- Photoreceptor_cell wikiPageID "401150".
- Photoreceptor_cell wikiPageRevisionID "606298676".
- Photoreceptor_cell align "right".
- Photoreceptor_cell alt "Anatomy of a Rod Cell".
- Photoreceptor_cell alt "Cone cell structure".
- Photoreceptor_cell caption "Functional parts of the rods and cones, which are two of the three types of photosensitive cells in the retina".
- Photoreceptor_cell direction "horizontal".
- Photoreceptor_cell footer "Anatomy of cones and rods varies slightly.".
- Photoreceptor_cell footerAlign "center".
- Photoreceptor_cell hasPhotoCollection Photoreceptor_cell.
- Photoreceptor_cell image "Cone cell en.png".
- Photoreceptor_cell image "Rod&Cone.jpg".
- Photoreceptor_cell name "Photoreceptor Cell".
- Photoreceptor_cell neurolex "Photoreceptor Cell".
- Photoreceptor_cell neurolexid "sao1233810115".
- Photoreceptor_cell width "180".
- Photoreceptor_cell width "200".
- Photoreceptor_cell subject Category:Histology.
- Photoreceptor_cell subject Category:Human_eye_anatomy.
- Photoreceptor_cell subject Category:Photoreceptor_cells.
- Photoreceptor_cell type Cell100006484.
- Photoreceptor_cell type LivingThing100004258.
- Photoreceptor_cell type NerveCell105465567.
- Photoreceptor_cell type Object100002684.
- Photoreceptor_cell type PhysicalEntity100001930.
- Photoreceptor_cell type SomaticCell105430628.
- Photoreceptor_cell type Whole100003553.
- Photoreceptor_cell comment "A photoreceptor cell is a specialized type of neuron found in the retina that is capable of phototransduction. The great biological importance of photoreceptors is that they convert light (visible electromagnetic radiation) into signals that can stimulate biological processes.".
- Photoreceptor_cell label "Fotoreceptory".
- Photoreceptor_cell label "Fotorecettore".
- Photoreceptor_cell label "Fotorezeptor".
- Photoreceptor_cell label "Fotorreceptor".
- Photoreceptor_cell label "Fotorreceptor".
- Photoreceptor_cell label "Lichtgevoelige cel".
- Photoreceptor_cell label "Photoreceptor cell".
- Photoreceptor_cell label "Photorécepteur (biologie)".
- Photoreceptor_cell label "Фоторецептор".
- Photoreceptor_cell label "光受容体".
- Photoreceptor_cell label "感光细胞".
- Photoreceptor_cell sameAs Světločivná_buňka.
- Photoreceptor_cell sameAs Fotorezeptor.
- Photoreceptor_cell sameAs Fotorreceptor.
- Photoreceptor_cell sameAs Photorécepteur_(biologie).
- Photoreceptor_cell sameAs Sel_fotoreseptor.
- Photoreceptor_cell sameAs Fotorecettore.
- Photoreceptor_cell sameAs 光受容体.
- Photoreceptor_cell sameAs Lichtgevoelige_cel.
- Photoreceptor_cell sameAs Fotoreceptory.
- Photoreceptor_cell sameAs Fotorreceptor.
- Photoreceptor_cell sameAs m.023wcd.
- Photoreceptor_cell sameAs Q748049.
- Photoreceptor_cell sameAs Q748049.
- Photoreceptor_cell sameAs Photoreceptor_cell.
- Photoreceptor_cell wasDerivedFrom Photoreceptor_cell?oldid=606298676.
- Photoreceptor_cell depiction 1414_Rods_and_Cones.jpg.
- Photoreceptor_cell isPrimaryTopicOf Photoreceptor_cell.