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E Physical Methods and Analytical Techniques

Physical Methods and Analytical Techniques.—Nucleotide maps of enzymic digests of DNA have been obtained using the same ionophoretic techniques as have been developed for RNA digests. Pancreatic DNase and Neurospora crassa endonuclease produce very similar maps with E. coli DNA but this technique still awaits the discovery of specific DNases. [Pg.133]

A method for the direct spectrophotometric determination of dinucleoside monophosphates has been developed which relies on changes in u.v. absorbance after enzymic hydrolysis. - Hydrolytic fission of the dinucleoside monophosphate with a phosphodiesterase causes a change in the u.v. absorbance of the solution allowing the 5 -nucleoside to be estimated. Addition of a phosphomonoesterase to the hydrolysate causes a further change in u.v. absorbance, allowing the 3-nucleoside to be estimated. [Pg.134]




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