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What is use of density gradient centrifugation?

What is use of density gradient centrifugation? Correct Answer To purify viruses, ribosomes, membranes

Density gradient centrifugation is used to purify viruses, ribosomes, membranes. A sucrose density gradient is created by gently overlaying lower concentrations of sucrose on higher concentrations in centrifuge tubes where particles of interest are placed on top in ultracentrifuges. The particles move through the gradient until they reach the same sucrose density and fraction is removed and analyzed.

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