title: Variation of the average rotation angle of the DNA helix and the superhelical turns of covalently closed cyclic lambda DNA.
mesh_terms: D002499:Centrifugation, Density Gradient; D002586:Cesium; D055598:Chemical Phenomena; D002621:Chemistry; D003090:Coliphages; D004279:DNA, Viral; D004926:Escherichia coli / Q000201:enzymology; D006358:Hot Temperature; D008094:Lithium; D011188:Potassium; D000644:Quaternary Ammonium Compounds; D011804:Quinolines; D012964:Sodium
chemical_list: D004279:DNA, Viral; D000644:Quaternary Ammonium Compounds; D011804:Quinolines; D002586:Cesium; D008094:Lithium; D012964:Sodium; D011188:Potassium