fraction


fraction
1. The quotient of two quantities. 2. An aliquot portion or any portion. 3. As a verb, to separate into portions.
- amorphous f. of adrenal cortex noncrystalline residue of an acetone extract of the adrenal cortex after crystalline steroids, e.g., corticosterone, deoxycorticosterone, etc., have been isolated.
- blood plasma fractions portions of the blood plasma as separated by electrophoresis or other technique.
- f. collector a device used to collect the eluate from a column in column chromatography.
- dried human plasma protein f. freeze-dried human plasma protein f..
- ejection f. the f. of the blood contained in the ventricle at the end of diastole that is expelled during its contraction, i.e., the stroke volume divided by end-diastolic volume, normally 0.55 (by electrocardiogram) or greater; with the onset of congestive heart failure, the ejection f. decreases, sometimes to 0.10 or even less in severe cases.
- filtration f. (FF) the f. of the plasma entering the kidney that filters into the lumen of the renal tubules, determined by dividing the glomerular filtration rate by the renal plasma flow; normally, it is around 0.17.
- human antihemophilic f. SYN: human antihemophilic factor.
- human plasma protein f. a sterile solution of selected proteins derived from the blood plasma of adult human donors, containing 4.5 to 5.5 g of protein per 100 ml, of which 83 to 90% is albumin and the remainder is α- and β-globulins; used as a blood volume supporter.
- mole f. the ratio of the moles of one component of a system to the total moles of all the components present.
- radionuclide ejection f. a nuclear medicine study for determination of ejection f. of either ventricle; supersedes multiple-gated acquisition scan in some centers. SEE ALSO: multiple-gated acquisition scan.
- recombination f. the proportion of progeny of a mating pair of specific genotype and coupling phase that are recombinant; there must be no differential selection among the possible types of progeny, and the recombination f. should be the same regardless of the alleles involved or their coupling phase.
- regurgitant f. the amount of blood regurgitated into a cardiac chamber divided by the stroke output; normally, no blood regurgitates; in patients with severe valvular lesions such as mitral or aortic insufficiency, regurgitant f. can approach 80%; this f. affords a quantitative measure of the severity of the valvular lesion.

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frac·tion 'frak-shən n one of several portions (as of a distillate) separable by fractionation <gamma globulin is a \fraction of blood plasma>

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frac·tion (frakґshən) 1. a portion of something larger; see also fractionation and fractional dose, under dose. 2. in chemistry, one of the separable constituents of a substance.

Medical dictionary. 2011.

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  • fraction — [ fraksjɔ̃ ] n. f. • 1187; « rupture » v. 1400; bas lat. fractio, de frangere « briser » I ♦ Liturg. La fraction du pain : action de rompre le pain eucharistique avant de communier. II ♦ 1 ♦ (1538) Math. Nombre rationnel, élément de l ensemble Q …   Encyclopédie Universelle

  • Fraction — Frac tion, n. [F. fraction, L. fractio a breaking, fr. frangere, fractum, to break. See {Break}.] 1. The act of breaking, or state of being broken, especially by violence. [Obs.] [1913 Webster] Neither can the natural body of Christ be subject to …   The Collaborative International Dictionary of English

  • fraction — Fraction. subst. fem. Action par laquelle on rompt. En ce sens il n a d usage qu en certaines phrases consacrées. Les Pelerins d Emaüs connurent nostre Seigneur à la fraction du pain. le corps de Jesus Christ n est point rompu par la fraction de… …   Dictionnaire de l'Académie française

  • fraction — frac‧tion [ˈfrækʆn] noun [countable] a very small amount of something: • Generic versions of the drug sell for a fraction of the branded price. * * * fraction UK US /ˈfrækʃən/ noun [C, usually singular] ► a small part or amount of something:… …   Financial and business terms

  • fraction — in general use means ‘a very small part’: • Teaching loads at white schools often are only a fraction the size of those at black schools Saturday Review, AmE 1971. This use is idiomatic despite the pedantic objection occasionally heard that a… …   Modern English usage

  • Fraction — Frac tion, v. t. (Chem.) To separate by means of, or to subject to, fractional distillation or crystallization; to fractionate; frequently used with out; as, to fraction out a certain grade of oil from pretroleum. [1913 Webster] …   The Collaborative International Dictionary of English

  • fraction — [n1] part bite, chunk, cut, division, end, fragment, half, piece, portion, section, share, slice; concept 835 Ant. entirety, total, whole fraction [n2] incomplete number bit, division, fragment, part, partial, piece, portion, quotient, ratio,… …   New thesaurus

  • Fraction — (v. lat.), 1) Bruch; 2) das Brechen; 3) in den parlamentarischen Parteien die kleineren Unterabtheilungen od. Gruppen, welche in einzelnen Principienfragen von der Hauptpartei abweichen …   Pierer's Universal-Lexikon

  • Fraction — Fraction, lat. fractio, Brechung, Bruch; Partei. Fractur, Knochenbruch; in der Buchdruckerei die eckige deutsche Schrift; in der Kalligraphie die Kanzleischrift, die nachgeahmte deutsche Druckschrift …   Herders Conversations-Lexikon

  • fraction — index constituent (part), element, installment, member (constituent part), modicum, moiety, part …   Law dictionary

  • fraction — late 14c., originally in the mathematical sense, from Anglo Fr. fraccioun (O.Fr. fraccion, 12c., breaking ) and directly from L.L. fractionem (nom. fractio) a breaking, especially into pieces, noun of action from pp. stem of L. frangere to break …   Etymology dictionary


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