retinal

retinal
1. Relating to the retina. 2. Retinaldehyde; most commonly referring to the all-trans form.
- r. isomerase an isomerase that catalyzes the cis-trans-interconversion of all-trans-r. to 11-cis-r.(dehyde); a part of the vision cycle. SYN: retinaldehyde isomerase.

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ret·i·nal 'ret-ən-əl, 'ret-nəl adj of, relating to, involving, or being a retina <a \retinal examination> <\retinal rods>
ret·i·nal 'ret-ən-.al, -.ȯl n a yellowish to orange aldehyde C20H28O derived from vitamin A that in combination with proteins forms the visual pigments of the retinal rods and cones called also retinene, retinene1, vitamin A aldehyde

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n.
the aldehyde of retinol (vitamin A). See also rhodopsin.

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ret·i·nal (retґĭ-nəl) 1. pertaining to the retina. 2. the aldehyde of retinol, derived from absorbed dietary carotenoids or esters of retinol and having vitamin A activity. In the retina, retinal combines with opsins of rods (scotopsins) and cones (photopsins), functioning as the prosthetic group in the resulting visual pigments rhodopsin and the iodopsins.

Medical dictionary. 2011.

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Look at other dictionaries:

  • Rétinal — Tout trans rétinal Général Nom IUPAC (2E,4E,6E,8E) 3,7 dimethyl 9 (2,6,6 trimethylcyclohexen 1 yl)nona 2,4,6,8 tetraenal …   Wikipédia en Français

  • retinal — carotenoide componente de los pigmentos visuales. De los 16 isoméros posibles el 11 cis retinal es el cromóforo de la mayor parte de las opsinas naturales estructura química [véase http://www.iqb.es/diccio/r/re.htm#retinal] Diccionario ilustrado… …   Diccionario médico

  • rétinal — [ retinal ] n. m. • 1972; de rétine ♦ Biol. Aldéhyde de la vitamine A entrant, avec l opsine, dans la composition du pourpre rétinien. (Plur. inus. rétinals.) ● rétinal ou rétinène nom masculin Aldéhyde diterpénique C20H28O, apparenté au rétinol …   Encyclopédie Universelle

  • Retinal — Ret i*nal, a. (Anat.) Of or pertaining to the retina. [1913 Webster] {Retinal purple} (Physiol. Chem.), the visual purple. [1913 Webster] …   The Collaborative International Dictionary of English

  • Retinal — Ret i*nal, n. (Chem.) A retinoid compound ({C20H28O}), closely related to vitamin A, which is a component of the visual pigments in the eye. It is also called {retinaldehyde} and {vitamin A aldehyde}. [PJC] …   The Collaborative International Dictionary of English

  • Retinal — ⇒ Axerophthol …   Deutsch wörterbuch der biologie

  • retinal — (adj.) 1838; see RETINA (Cf. retina) + AL (Cf. al) (1) …   Etymology dictionary

  • retinal — [ret′ n əl] adj. of or related to a retina n. Biochem. 1. a yellowish carotenoid, C20H28O, liberated when rhodopsin or iodopsin is transformed by the action of light 2. a similar carotenoid, C20H26O, formed by the action of light on porphyropsin …   English World dictionary

  • Retinal — Strukturformel …   Deutsch Wikipedia

  • Retinal — chembox new ImageFile = Retinal structure.png ImageSize = IUPACName = OtherNames = Formula = C20H28O PubChem = 1070 SMILES = MolarMass= 284.436 Appearance = CASNo = 116 31 4 Density= MeltingPt= 63 °C BoilingPt= Solubility = MainHazards = FlashPt …   Wikipedia

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