Density gradient centrifugation
When solution of caesium chloride spins in the ultracentrifuge, the dense caesium chloride spins in the ultracentrifuge, the dense caesium chloride sediments toward the bottom until equilibrium is established between the centrifugal force and diffusion forces. At equilibrium there is a gradient of caelsium chloride and therefore of density from high density at the bottom of the tube to relatively low density at the top. If DNA is included in the solution, it will also seek an equilibrium position at the point on the tube where its density matches that of calsium chloride solution
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