BioScience Dictionary

 
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Found Density gradient 2 times.

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1. Density gradient
A solution in which the concentration of the solute is lowest at the top and gradually becomes more dense as it gets deeper, and is highest at the bottom. It can be stepwise (each level of density is discrete from other levels of density, and forms a separate layer) or continuous (the density changes gradually).

2. Density gradient centrifugation
High-speed centrifugation in which molecules "float" at a point where their density equals that in a gradient of cesium chloride or sucrose .