title: [X-ray diffraction study of polymorphism of the DNA double helix at protonation].
abstract: X-ray diffractograms of DNA fibers have been obtained at various degrees of protonation (alpha). At the protonation degrees preceding acid denaturation, DNA double helix undergoes polymorphic transformation. At 75% relative humidity DNA helix of 11 : 1 type protonated up to alpha = 0.3 changes to 10 : 1 type.
mesh_terms: D000818:Animals; D004247:DNA; D005399:Fishes; D006863:Hydrogen-Ion Concentration; D009690:Nucleic Acid Conformation; D014961:X-Ray Diffraction
chemical_list: D004247:DNA
vernacular_title: Rentgenostrukturnoe issledovanie polimorfizma dvoĭnoĭ spirali DNK pri protonirovanii.