A SIMPLE ASSAY FOR DNA ENDONUCLEASES.
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Biomedical subjects
Publications and source records attributed to E P GEIDUSCHEK.
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Salmon DNA has been irradiated with visible light in the presence of acridine orange. If the dye is bound to the DNA, there results: (a) a decrease in sedimentation coefficient, (b) a lowering of viscosity, and (c) a decrease in the thermal denaturation temperature. CsCl banding experiments show that the first two effects reflect depolymerization of the DNA. Depolymerization apparently occurs by single-strand scission although some double-strand scission is not excluded. The destabilization of secondary structure results probably from chemical attack on the components of the individual strands.
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