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

/frac·tion·a·tion/ (frak″shun-a´shun)
1. in radiology, division of the total dose of radiation into small doses administered 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.

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

[frak′shənā′shən]
Etymology: L, frangere, to break
1 (in neurology) a mechanism within the neural arch of the vertebrae whereby only a portion of the efferent nerves innervating a muscle reacts to a stimulus, even when the reflex requirement is maximal, so that a reserve of neurons remains to respond to additional stimuli. Through this phenomenon muscle tension is maintained.
2 (in chemistry) the separation of a substance into its basic constituents by using such procedures as fractional distillation or crystallization.
3 (in bacteriology) the process of isolating a pure culture by successive culturing of a small portion of a colony of bacteria.
4 (in histology) the process of isolating the different components of living cells by centrifugation.
5 (in radiology) the process of administering a dose of radiation in smaller units over time to minimize tissue damage rather than in a single large dose. also called dose fractionation.

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.

fractionation

(frak´shənā´shən),
n 1. the separation of a substance into its basic constituents.
2. the process of isolating a pure culture by sucessive culturing of a small portion of a colony of bacteria.
3. the process of isolating different components of living cells by centrifugation.
4. the process of administering a dose of radiation in smaller units over time to minimize tissue damage.

fractionation

1. in radiotherapy, 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.
References in periodicals archive ?
MarkWest Energy Partners LPintends to construct 17 major processing and fractionation projects in the Northeast and Midwest, adding to its large midstream oil and gas presence in the region.
In addition to its Seneca processing complex, MarkWest Utica will construct an NGL gathering system to its Cadiz processing complex and on to a new fractionation and marketing complex both located in Harrison County, Ohio.
The company continues to expand its leading midstream presence throughout the Northeast and has 17 major processing and fractionation projects under construction.
The major players in the global Plasma Fractionation Market are Baxter International, Inc.
There are now at least two ways that the anomalous sulfur isotope fractionation seen in some rocks could be achieved," Ohmoto added.
Regency Energy Partners LP (NYSE:RGP ) is a growth-oriented, midstream energy partnership engaged in the gathering and processing, contract compression, treating and transportation of natural gas and the transportation, fractionation and storage of natural gas liquids.
Fiber fractionation is a process that segregates fibers into two or more streams based on differences in their physical properties.
Product Development/Innovation: Detailed insights on upcoming trends, research and development activities, and new product launches in the plasma fractionation market.
When combined with RFS II, which is expected to come into service in late 2015, the company's fractionation capacity is anticipated to nearly double to 155,000 bpd.
This well-written book serves as an introduction to the separation of a wide variety of macromolecules, colloids and particulate material of synthetic or biological origin using field-flow fractionation techniques.
Fu KK, Pajak TF, Trotti A, et al, A Radiation Therapy Oncology Group (RTOG) phase III randomized study to compare hyperfractionation and two variants of accelerated fractionation to standard fractionation radiotherapy for head and neck squamous cell carcinomas: First report of RTOG 9003.
Table 4 summarizes differences between the analyses of spectra from the fractionated resins and the low Mw fractions removed during the fractionation of MPT by both methods.