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centrifugation
Centrifugation is a process which involves the application of the centripetal force for the sedimentation of heterogeneous mixtures with a centrifuge, and is used in industrial and laboratory settings. This process is used to separate two immiscible substances. More-dense components of the mixture migrate away from the axis of the centrifuge, while less-dense components of the mixture migrate towards the axis. Chemists and biologists may increase the effective gravitational force on a test tube so as to more rapidly and completely cause the precipitate (pellet) to gather on the bottom of the tube. The remaining solution is properly with a Pasteur pipette.
The rate of centrifugation is specified by the angular velocity measured in revolutions per minute (RPM), or acceleration expressed as ''g''. The conversion factor between RPM and ''g'' depends on the radius of the centrifuge rotor. The particles' settling velocity in centrifugation is a function of their size and shape, centrifugal acceleration, the volume fraction of solids present, the density difference between the particle and the liquid, and the viscosity. The most common application is the separation of solid from highly concentrated suspensions, which is use in the treatment of sewage sludges for dewatering where less consistent sediment is produced.〔Article on "Centrifugation" retrieved on 15th October 2013 from http://www.lenntech.com/library/clarification/clarification/centrifugation.htm〕
In the chemical and food industries, special centrifuges can process a continuous stream of particle-laden liquid.
Centrifugation is the most common method used for uranium enrichment, relying on the slight mass difference between atoms of U238 and U235 in uranium hexafluoride gas.
==Centron in biological research==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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