title: Optical rotatory dispersion and circular dichroism of superhelical deoxyribonucleic acid.
mesh_terms: D002499:Centrifugation, Density Gradient; D002942:Circular Dichroism; D003090:Coliphages / Q000032:analysis; D004279:DNA, Viral / Q000032:analysis*; D009905:Optical Rotatory Dispersion; D012965:Sodium Chloride; D013329:Structure-Activity Relationship; D014461:Ultracentrifugation
chemical_list: D004279:DNA, Viral; D012965:Sodium Chloride