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We have developed a method for separating a mixture of macromolecules or small particles suspended in a fluid. The separation is according to mass, or more precisely, according to what we shall call the effective mass, the mass of a particle minus the mass of the fluid it displaces. We expose the fluid to a steady acceleration, allowing the suspended particles to distribute themselves in equilibrium atmospheres whose scale heights, h,, depend on the effective masses, me, through the familiar relation
Berg et al. (Fri,) studied this question.