1. To separate components of a mixture. 2. The administration of a course of therapeutic radiation of a neoplasm in a planned series of fractions of the total dose, most often once a day for several weeks, in order to minimize radiation damage of contiguous normal tissues.

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frac·tion·a·tion .frak-shə-'nā-shən n the action or process of fractionating <\fractionation of blood plasma by the precipitation of blood proteins> also the state of being fractionated

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frac·tion·a·tion (frak″shən-aґshən) 1. in radiotherapy, division of the total dose of radiation into small doses administered at intervals, which usually causes less biological damage than the same total dose given at one time; see also hyperfractionation. Called also dose fractionation. 2. division of the total dosage of a drug into smaller doses (fractional doses) administered at frequent intervals. Called also dose f. 3. in chemistry, separation of a substance into components, as by distillation or crystallization. 4. in histology, isolation of components of living cells by differential centrifugation.

Medical dictionary. 2011.

Look at other dictionaries:

  • fractionation — frac tion*a tion n. the act or process of separating a mixture into portions of different composition, as in distillation or {fractional crystallization}. Syn: fractional process. [WordNet 1.5 +PJC] 2. (Petroleum industry) Separation of crude oil …   The Collaborative International Dictionary of English

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  • fractionation — A term used to describe any method for separating and purifying biological molecules. See also cell fractionation …   Dictionary of molecular biology

  • fractionation — noun A separation process in which a certain quantity of a mixture is divided up into smaller quantities (fractions) in which the composition changes according to a gradient. Methane is separated from other hydrocarbons in a gas fractionation… …   Wiktionary

  • fractionation — frakcionavimas statusas T sritis chemija apibrėžtis Mišinio skirstymas į frakcijas. atitikmenys: angl. fractionating; fractionation rus. фракционирование …   Chemijos terminų aiškinamasis žodynas

  • fractionation — rektifikavimas statusas T sritis chemija apibrėžtis Vienalyčio skysčių mišinio perskyrimas, pagrįstas priešpriešiais judančių skysčio garų ir kondensato srautų sąlyčiu. atitikmenys: angl. fractionation; rectification rus. ректификация …   Chemijos terminų aiškinamasis žodynas

  • fractionation — frakcionavimas statusas T sritis ekologija ir aplinkotyra apibrėžtis Skysčių mišinio skirstymas į sudėtines dalis pagal tų dalių virimo temperatūrą. atitikmenys: angl. fractionation vok. Fraktionierung, f; Fraktionsbildung, f rus.… …   Ekologijos terminų aiškinamasis žodynas

  • fractionation — noun see fractionate …   New Collegiate Dictionary

  • fractionation — /frak sheuh nay sheuhn/, n. 1. the act or process of fractionating. 2. the state of being fractionated. 3. Mil. the division of a missile s payload into several warheads. [1925 30; FRACTIONATE + ION] * * * …   Universalium

  • fractionation —    The separation of one group of compounds in a mixture from another, generally by distillation …   Forensic science glossary

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