ultrafiltration

Filtration through a semipermeable membrane or any filter that separates colloid solutions from crystalloids or separates particles of different size in a colloid mixture.

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ul·tra·fil·tra·tion .əl-trə-fil-'trā-shən n filtration through a medium (as a semipermeable capillary wall) which allows small molecules (as of water) to pass but holds back larger ones (as of protein)

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n.
filtration under pressure. In the kidney, blood is subjected to ultrafiltration to remove the unwanted water, urea, and other waste material that goes to make up urine.

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ul·tra·fil·tra·tion (ul″trə-fil-traґshən) filtration through filters with minute pores, which allows separation of extremely minute particles. It occurs naturally, as in the filtration of plasma at the capillary membrane, and is also performed clinically and in the laboratory, such as in hemodialysis. In hemodialysis it involves bulk movement of solute and solvent across a membrane down pressure gradients and is usually performed under pressure to accelerate the process.

Medical dictionary. 2011.

Look at other dictionaries:

  • ultrafiltration — [ yltrafiltrasjɔ̃ ] n. f. • 1908; de ultra et filtration ♦ Sc. Filtration à travers une membrane à pores très fins, qui permet la séparation de particules microscopiques. ● ultrafiltration nom féminin (allemand Ultrafiltration) Passage sélectif… …   Encyclopédie Universelle

  • Ultrafiltration — (UF) is a variety of membrane filtration in which hydrostatic pressure forces a liquid against a semipermeable membrane. Suspended solids and solutes of high molecular weight are retained, while water and low molecular weight solutes pass through …   Wikipedia

  • Ultrafiltration — Die Ultrafiltration ist ein Filtrationsverfahren aus dem Bereich der Membrantechnik, mit der sich makromolekulare Substanzen und kleine Partikel aus einem Medium abtrennen und aufkonzentrieren lassen. Inhaltsverzeichnis 1 Einordnung 2 Anwendungen …   Deutsch Wikipedia

  • Ultrafiltration — Sommaire 1 En médecine 2 En Industrie 3 En Traitement de l eau 4 Notes et références En médecine L …   Wikipédia en Français

  • Ultrafiltration — ultrafiltravimas statusas T sritis Standartizacija ir metrologija apibrėžtis Filtravimas per membranas, kurių akutės matmenys nuo 0,01 μm iki 0,1 μm. atitikmenys: angl. ultrafiltration vok. Ultrafiltration, f rus. ультрафильтрование, n pranc.… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • ultrafiltration — n. filtration under pressure. In the kidney, blood is subjected to ultrafiltration to remove the unwanted water, urea, and other waste material that goes to make up urine …   The new mediacal dictionary

  • ultrafiltration — ultrafiltravimas statusas T sritis chemija apibrėžtis Filtravimas per membranas, kurių akutės matmenys 0,01–0,1 μm. atitikmenys: angl. ultrafiltration rus. ультрафильтрование …   Chemijos terminų aiškinamasis žodynas

  • ultrafiltration — noun Date: 1908 filtration through a medium (as a semipermeable capillary wall) which allows small molecules (as of water) to pass but holds back larger ones (as of protein) • ultrafiltrate noun …   New Collegiate Dictionary

  • ultrafiltration — Filtration under pressure. In the kidney, an ultrafiltrate is formed from plasma because the blood is at higher pressure than the lumen of the glomerulus. Also used experimentally to fractionate and concentrate solutions in the laboratory using… …   Dictionary of molecular biology

  • ultrafiltration — ul·tra·fil·tra·tion (ŭl trə fĭl trāʹshən) n. The filtration of a colloidal substance through a semipermeable medium that allows only the passage of small molecules. * * * …   Universalium

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