Abstract
A method for the determination of the amount of double-stranded DNA in a reassociation mixture is described. Reassociated DNA resistant to S1 nuclease digestion is measured fluorometrically using propidium iodide. A direct comparison is made between this method and an established method in which radiolabeled Escherichia coli DNA resistant to S1 digestion is measured by scintillation counting after separation of nucleotides by Sephadex G-100 chromatography. Reassociation curves determined for calf thymus and E. coli DNA are presented.
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