Concentration Dependence of the Sedimentation Coefficient at the Theta State

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Abstract
The sedimentation constant at the theta state at a finite concentration was calculated on the basis of Yamakawa's formulation, taking more rigorous account of hydrodynamical interaction. The results show that even at the theta state the concentration effect still remains and that k s , the coefficient of the first power of weight concentration, is proportional to M 1/2 .