title: Degree of superhelicity of covalently closed cyclic DNA's from Escherichia coli.
mesh_terms: D002498:Centrifugation; D002586:Cesium; D055598:Chemical Phenomena; D002621:Chemistry; D003090:Coliphages / Q000032:analysis*; D004269:DNA, Bacterial / Q000032:analysis*; D004279:DNA, Viral / Q000032:analysis*; D004492:Edetic Acid; D004926:Escherichia coli / Q000032:analysis*; D008242:Lysogeny; D000644:Quaternary Ammonium Compounds; D011804:Quinolines
chemical_list: D004269:DNA, Bacterial; D004279:DNA, Viral; D000644:Quaternary Ammonium Compounds; D011804:Quinolines; D002586:Cesium; D004492:Edetic Acid