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<unit>
A unit for measuring the rate at which a particle sediments in a centrifuge.
The unit applied to the sedimentation coefficient of a particle in a high speed or ultracentrifuge.
S= rate of sedimentation x 1/ rho exp2r
Where rho is the speed of rotation in radians per second and r is the radius to a chosen point in the centrifuge tube.
1 Svedberg unit is defined as a velocity gradient of 10exp 13 seconds. Named after a pioneer of the ultracentrifuge.
The units are nonadditive: a particle formed from two 5S particles will not have a sedimentation coefficient of 10S.
This entry appears with permission from the Dictionary of Cell and Molecular Biology
(11 Mar 2008)
S value, S van Creveld, Svante Arrhenius, SVC < Prev | Next > Svedberg equation, Svedberg of flotation
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