density-gradient centrifuge

(A new technique, density-gradient centrifugation, could be used to separate such molecules by weight.) On heating, this DNA separated into half heavy and half light strands. Meselson and Stahl concluded that the new DNA molecules were composed of one strand of each: the heavy inherited, the light newly…

…both as continuous-flow and as density-gradient centrifuges. The density-gradient centrifuge consists in setting up a radial density variation or gradient in the tubular centrifuge with slowly sedimenting nonreactive smaller molecules such as sucrose or calcium chloride. If, then, the density of the substance to be purified falls within the range…