[A compact form of DNA in solution. 2. Peculiarities of acidic titration of double-stranded DNA in PEG-containing water-salt solutions].
The formation of compact double-stranded DNA molecules in PEG-containing watersalt solutions (0.3 M NaCl) may be observed within the pH-range 3-10; i.e. under conditions at which parameters of double-stranded DNA helices are not strongly different from those of B-form. At pH less than 3, when regularity of double helices is significantly changed, the formation of the specific compact particles of DNA in PEG-containing solutions does not take place. Denaturation of the compact form of DNA in PEG-containing solution is accompanied by disappearance of the negative band in CD spectrum. Hyperchromic effect of denaturation of DNA compact form is uninformative because of the influence of the light-scattering by compact DNA molecules.
D002942:Circular Dichroism; D004247:DNA; D006863:Hydrogen-Ion Concentration; D009691:Nucleic Acid Denaturation; D011092:Polyethylene Glycols; D012492:Salts; D012996:Solutions; D013056:Spectrophotometry, Ultraviolet; D014867:Water
D012492:Salts; D012996:Solutions; D014867:Water; D011092:Polyethylene Glycols; D004247:DNA
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