fractionation

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fractionation

 [frak″shun-a´shun]
1. in radiology, division of the total dose of radiation into small doses given at intervals.
2. in chemistry, separation of a substance into components, as by distillation or crystallization.
3. in histology, isolation of components of living cells by differential centrifugation.

frac·tion·a·tion

(frak'shŭn-ā'shŭn),
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.

fractionation

(frăk′shə-nā′shən)
n.
1. The process of dividing or separating into parts; breaking up.
2. The division of a total therapeutic dose of radiation into small doses to be administered over a period of days or weeks.
3. The separation of a chemical compound into components, as by distillation.

fractionation

Radiation oncology The parceling of a dose of radiation over time. See Accelerated fractionation, Hyperfractionation, Radiation therpy.

frac·tion·a·tion

(frakshŭn-āshŭn)
1. Separation of the components of a mixture into its basic constituents.
2. The administration of a course of therapeutic radiation in a planned series of fractions of the total dose, most often once a day for several weeks, to minimize radiation damage of contiguous normal tissues.

Fractionation

A laboratory test or process in which blood or another fluid is broken down into its components. Fractionation can be used to assess the proportions of the different types of cholesterol in a blood sample.

frac·tion·a·tion

(frakshŭn-āshŭn)
1. Separation of the components of a mixture into its basic constituents.
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, to minimize radiation damage.
References in periodicals archive ?
Added to this, the data on [Pi.sub.RTA] and [Pi.sub.bic] in the soil agrees with those obtained in other studies (Gatiboni et al., 2007; Santos et al., 2008; Tokura et al., 2011), that using the technique of chemical fractionation of P, there are reports that the levels of these two fractions of the nutrient in the soil increase with the applied dose of soluble phosphate fertilizers.
Amended soils (C+SS) showed changes in the distribution determined by chemical fractionation when compared with control samples (C).
Escudey M, Galindo G, Avendano K, Borchardt D, Chang A, Briceno M (2004a) Distribution of phosphorus forms in Chilean soils and sewage sludge by chemical fractionation and [sup.31]P-NMR.
Chemical fractionation techniques such as those described by McLaren and Crawford (1973) and Shuman (1985) have been used extensively in attempts to examine the nature and amounts of various trace elements, including Co in soils (Jarvis 1984b; McLaren et al.
To achieve this objective, we used a sequential chemical fractionation technique to fractionate Co and Mn in 18 different soils collected from sites throughout New Zealand.
Of particular interest, because of its simplicity, is the chemical fractionation method that involves separation of soil organic matter of varying degrees of lability using oxidation with varying concentrations of KMn[O.sub.4] (Loginow et al.