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Others books define a theoretical hydrodynamic radius Rhyd. They consider the macromolecule or colloid particle to be a collection of N subparticles. This is done most commonly for polymers; the subparticles would then be the units of the polymer. Rhyd is defined by
where rij is the distance between subparticles i and j, and where the angular brackets represent an ensemble average.  The theoretical hydrodynamic radius Rhyd was originally an estimate by John G. Kirkwood of the Stokes radius of a polymer.
Grosberg AY and Khokhlov AR. (1994) Statistical Physics of Macromolecules (translated by Atanov YA), AIP Press. ISBN 1-56396-071-0
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Hydrodynamic_radius". A list of authors is available in Wikipedia.|