density gradient centrifugation
Definition: ultracentrifugation of substances in concentrated solutions of cesium salts or of sucrose; at equilibrium, the medium exhibits a concentration (hence density) gradient increasing in the direction of centrifugal force and the substances of interest collect in layers at the levels of their densities.
See: isopycnic zone
Search Stedman's Medical Dictionary
Examples: glitazone, GI cocktail, etc.