Information about Photoreceptor
Photoreceptor can refer to:
In anatomy/cell biology:
In anatomy/cell biology:
- Photoreceptor cell: a photosensitive cell, most commonly referring to a specialized type of neuron found in the retina of vertebrate eyes that is capable of phototransduction;
- Ocellus (invertebrate photoreceptor): a photoreceptor organ ("simple eye") of invertebrates often comprised of a few sensory cells and a single lens;
- Eyespot apparatus (microbial photoreceptor): the photoreceptor organelle of a unicellular organism that allows for phototaxis.
- Photoreceptor protein: a chromoprotein that responds to being exposed to a certain wavelength of light by initiating a signal transduction cascade;
- Photopigment: an unstable pigment that undergoes a physical or chemical change upon absorbing a particular wavelength of light; also see:
- Photosynthetic pigment: molecules involved in transducing light into chemical energy.
- Photodetector or photosensor: a device that detects light by capturing photons
photoreceptor, or photoreceptor cell, is a specialized type of neuron found in the eye's retina that is capable of phototransduction. More specifically, the photoreceptor absorbs photons from the visual field and signals this information to other neurons through a change in
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ocellus (plural: ocelli) is a type of photoreceptor organ in animals. Also called "simple eyes", ocelli are miniature eyes capable of sensing light but not distinguishing its direction. See also stemmata, which are structurally similar. Ocelli are found in many invertebrates.
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eyespot apparatus (or stigma) is a photoreceptive organelle found in the flagellate (motile) cells of green algae and other unicellular photosynthetic organisms such as euglenids.
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Photoreceptors are light-sensitive proteins involved in the sensing and response to light in a variety of organisms. Some examples are rhodopsin in the photoreceptor cells of the vertebrate retina, phytochrome in plants, and bacteriorhodopsin in some bacteria.
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Photopigments are unstable pigments that undergo a physical or chemical change in the presence of light. The term is generally applied to the non-protein chromophore moiety of photosensitive chromoproteins, such as the pigments involved in photosynthesis and photoreception.
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A photosynthetic pigment or antenna pigment is a pigment that is present in chloroplasts or photosynthetic bacteria and captures the light energy necessary for photosynthesis.
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Photosensors or photodetectors are sensors of light or other electromagnetic energy. There are several varieties:
Most optical detectors are quantum devices in which an individual photon produces a discrete effect.
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Most optical detectors are quantum devices in which an individual photon produces a discrete effect.
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