fractionate

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fractionate

(frak′shŏ-nāt″)
To separate or divide a mixture, usually by means of the differing physical or chemical properties of its components.
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References in periodicals archive ?
During gradual decompression, the fractionation coefficient of the gas phase relative to the liquid phase was larger than zero and increased continuously until equilibrium was approached (Figure 3(b)).
Theoretical calculations indicated that the degree of Fe isotope fractionation caused by the difference between the coordination chemistry of Fe-Cl and Fe-[H.sub.2]0 complexes is likely caused by an oxidization-reduction effect [81].
During rapid sphalerite deposition, because of kinetic fractionation, the sphalerite is enriched in light [delta][sup.56]Fe (-1.2[per thousand]) and [delta][sup.66]Zn (-0.15[per thousand]), and the two values display a very high positive correlation [84].
amazonicus had the highest isotopic fractionation (7.02[per thousand]) in Guarana Lake, while the lowest value for this species (1.96[per thousand]) was in Porcos Lake.
By analysing each sampled location, we found that none of the species showed the same pattern of fractionation in relation to the other species.
The isotopic fractionation in organismal tissue varies according to food consumed, which comes from different sources (Adams and Sterner, 2000).
Table 3 shows the results of a fractionation series similar to that shown in Table 2 except that the resin was synthesized using a ratio of 5 parts of m-cresol, 4 parts of p-cresol and 2 parts of 2,3,5-trimethyl phenol (TMP) condensed with formaldehyde at a ratio 0.7 mole of formaldehyde to 1 mole of total phenols and using oxalic acid as the catalyst (0.3% by weight).
Yields and degree of fractionation are only limited by the immiscible solvents used for the input solutions, the temperature of the fractionation and the ratio of the inlet solution feed rates.
Methods based on segregation fractionation techniques by DSC (19-22) have been suggested recently for more detailed evaluations.
One objective of this work is to present the use of segregation fractionation techniques by DSC for studies of the comonomer incorporation in our different types of ethylene copolymers.
The tissue-diet fractionation values for five different size groups of the abalone were estimated as the first step in determining the applicability of stable isotope analyses in understanding abalone feeding habits in the natural habitat.
Experiments were performed to examine the fractionation values of stable isotope ratios in juvenile abalone fed three different types of food: fresh fronds of an adult macroalga Laminaria japonica (MA), a commercial formulated pellet (FP), and a benthic diatom Cylindrotheca closterium (BD; Table 1).