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-ə, -.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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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.

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] 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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