Continuous spectrum beyond the violet end of the visible spectrum (wavelength less than 400nm), and above the X-ray wavelengths (greater than 5nm). Glass absorbs UV, so optical systems at these wavelengths have to be made of quartz. Nucleic acids absorb UV most strongly at around 260nm, and this is the wavelength most likely to cause mutational damage (by the formation of thymine dimers). It is the UV component of sunlight that causes actinic keratoses to form in skin, but that is also required for Vitamin D synthesis.

Dictionary of molecular biology. 2004.

Look at other dictionaries:

  • ULTRAVIOLET — L’ultraviolet est le domaine des radiations électromagnétiques s’étendant depuis la limite violette du spectre visible (400 nm) jusqu’à la région des rayons X mous, qu’il recouvre partiellement (cf. figure). Cette délimitation repose… …   Encyclopédie Universelle

  • UltraViolet — es un Sistema de Derechos digitales (DRM) basado en la nube, desarrollado por DECE LLC, un consorcio que incluye a Sony, Adobe, Cisco, HP, Microsoft e Intel.[1] [2] Apple y Disney no soportan este formato.[3] UltraViolet pretende cr …   Wikipedia Español

  • ultraviolet — ULTRAVIOLÉT, Ă, ultravioleţi, te, adj. (Despre radiaţiile electromagnetice; şi substantivat, f. pl.) Care are lungimea de undă mai mică decât lungimea de undă minimă a radiaţiilor vizibile. [pr.: vi o ] – Din fr. ultraviolet. Trimis de ana… …   Dicționar Român

  • Ultraviolet — (engl. für ultraviolett) steht für: Ultraviolettstrahlung (UV Licht), elektromagnetische Strahlung Ultraviolet (Film) (2006), einen Science Fiction Thriller UltraViolet Ist ein Video Standard für eine Cloud Basierte Speicherung und Wiedergabe mit …   Deutsch Wikipedia

  • Ultraviolet — Ul tra*vi o*let, a. [Pref. ultra + violet.] (Physics) Lying outside the visible spectrum at its blue violet end; said of light more refrangible (i. e. having a shorter wavelength) than the extreme violet rays of the visible spectrum.… …   The Collaborative International Dictionary of English

  • ultraviolet — [ul΄trə vī′ə lit] adj. 1. pertaining to a band of electromagnetic radiation having wavelengths (from c. 5 to c. 400 nanometers) that are shorter than violet light 2. of, pertaining to, or producing radiation of such wavelengths n. ultraviolet… …   English World dictionary

  • ultraviolet — beyond the violet end of the visible spectrum, 1840, from ULTRA (Cf. ultra ) + VIOLET (Cf. violet). Ultra red (1870) was a former name for what now is called infra red …   Etymology dictionary

  • ultraviolet — ► NOUN ▪ electromagnetic radiation having a wavelength just shorter than that of violet light but longer than that of X rays. ► ADJECTIVE ▪ denoting such radiation …   English terms dictionary

  • Ultraviolet — UV redirects here. For other uses, see UV (disambiguation). UVB redirects here. For the mysterious shortwave radio station in Russia, see UVB 76. For other uses, see Ultraviolet (disambiguation). False color image of the Sun s corona as seen in… …   Wikipedia

  • Ultraviolet — Pour les articles homonymes, voir Ultraviolet (homonymie). Le soleil vu dans les ultraviolets par le télescope EIT de SoHO. Le rayonnement ultraviolet (UV) est un rayonnement électromag …   Wikipédia en Français

  • ultraviolet — Denoting electromagnetic rays at higher frequency than the violet end of the visible spectrum. u. A (UVA) u. radiation from 320 to 400 nm that causes skin tanning but is very weakly sunburn producing and carcinogenic. u. B (UVB) u. radiation from …   Medical dictionary

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