micelle


micelle
1. Nägeli term for elongated sub(light)microscopic particles, detected in hydrogels, of supramolecular character and crystalline structure; now defined as one of two classes of colloidal particle : those consisting of many molecules, the other class being single macromolecules light- or submicroscopic in size. A m. is thus a structural unit of the disperse phase in a gel, a unit whose repetition in three dimensions constitutes the micellar structure of the gel; it does not denote the individual particles in free suspension or solution, or the unit structure of a crystal. 2. Any water-soluble aggregate, spontaneously and reversibly, formed from amphiphile molecules. 3. A hypothetical ordered region in a natural fiber such as cellulose. [L. micella, small morsel, dim. of mica, morsel, grain]

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mi·celle mī-'sel n a unit of structure built up from polymeric molecules or ions: as
a) an ordered region in a fiber (as of cellulose or rayon)
b) a molecular aggregate that constitutes a colloidal particle

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n.
one of the microscopic particles into which the products of fat digestion (i.e. fatty acids and monoglycerides), present in the gut, are dispersed by the action of bile salts. Fatty material in this finely dispersed form is more easily absorbed by the small intestine.

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mi·celle (mi-selґ) a colloid particle formed by an aggregation of small molecules.

Medical dictionary. 2011.

Look at other dictionaries:

  • micelle — [ misɛl ] n. f. • v. 1900; du lat. mica « parcelle » ♦ Chim., phys. Particule formée d un agrégat de molécules en solution colloïdale. ⇒ colloïde. Adj. MICELLAIRE , 1922 . ⊗ HOM. Missel. ● micelle nom féminin ( …   Encyclopédie Universelle

  • micelle — [mīsel′ə, misel′ə] n. pl. micellae [mī sel′ē, mi sel′ēmī sel′, misel′] n. [ModL micella, dim. < L mica, a grain, crumb: see MICA] 1. Biol. a submicroscopic structural unit composed of a group of molecules, as in living protoplasm, starch… …   English World dictionary

  • Micelle — Cross section view of the structures that can be formed by phospholipids in aqueous solutions …   Wikipedia

  • Micelle — Schéma d une micelle directe formée par des phospholipides en solution aqueuse …   Wikipédia en Français

  • micelle — noun /maɪˈsɛl,məˈsɛl/ a colloidal aggregate, in a simple geometric form, of a specific number of amphipathic molecules which forms at a well defined concentration, called the critical micelle concentration …   Wiktionary

  • micelle — micelė statusas T sritis chemija apibrėžtis Elektriškai neutrali koloidinio tirpalo dalelė. atitikmenys: angl. micelle rus. мицелла …   Chemijos terminų aiškinamasis žodynas

  • micelle — noun Etymology: New Latin micella, from Latin mica Date: 1881 a unit of structure built up from polymeric molecules or ions: as a. an ordered region in a fiber (as of cellulose or rayon) b. a molecular aggregate that constitutes a colloidal… …   New Collegiate Dictionary

  • Micelle — Mizelle in Wasserlösung Mizellen (von lat. mica = Klümpchen, kleiner Bissen), auch Assoziationskolloide genannt, sind Aggregate (Assoziate) aus amphiphilen Molekülen bzw. grenzflächenaktiven Substanzen, die sich in einem Dispersionsmedium (meist… …   Deutsch Wikipedia

  • micelle — n.; pl. ae [L. micarius, crumbs] A supermolecular colloid particle, often an orderly packet of chain molecules in parallel arrangement …   Dictionary of invertebrate zoology

  • micelle — One of the possible ways in which amphipathic molecules may be arranged; a spherical structure in which all the hydrophobic portions of the molecules are inwardly directed, leaving the hydrophilic portions in contact with the surrounding aqueous… …   Dictionary of molecular biology

  • micelle — micellar, adj. micellarly, adv. /mi sel /, n. Physical Chem. an electrically charged particle formed by an aggregate of molecules and occurring in certain colloidal electrolyte solutions, as those of soaps and detergents. [1880 85; < NL micella,… …   Universalium