title: Characterization of a naturally occurring, cross-linked fraction of DNA. 1. Nature of the cross-linkage.
mesh_terms: D001412:Bacillus subtilis / Q000032:analysis*; D002499:Centrifugation, Density Gradient; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004247:DNA / Q000032:analysis*; D004269:DNA, Bacterial / Q000032:analysis*; D004926:Escherichia coli / Q000032:analysis*; D006193:Haemophilus influenzae / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D009691:Nucleic Acid Denaturation; D013053:Spectrophotometry; D013696:Temperature; D013950:Thymus Gland / Q000032:analysis*; D014170:Transformation, Genetic
chemical_list: D004269:DNA, Bacterial; D004247:DNA