title: Evidence for B-C transition in ultraviolet-irradiated DNA. An infrared linear dichroism study.
abstract: Oriented films of calf thymus DNA are studied before and after 254 nm ultraviolet irradiation by infrared linear dichroism. The ultraviolet-irradiated DNA films are changed in their conformation, which is indicated by a replacement of the B-A transition by a B-C transition when the humidity is lowered, from 90% to 75% relative humidity.
mesh_terms: D000818:Animals; D002417:Cattle; D004247:DNA / Q000528:radiation effects*; D003854:Deoxyribonucleotides / Q000032:analysis; D009690:Nucleic Acid Conformation; D011830:Radiation Effects; D013055:Spectrophotometry, Infrared; D013950:Thymus Gland; D014466:Ultraviolet Rays
chemical_list: D003854:Deoxyribonucleotides; D004247:DNA