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  • 1
    Electronic Resource
    Electronic Resource
    Protonated polynucleotide structures (1973)
    Springer
    Molecular biology reports 1 (1973), S. 155-160 
    Details
    ISSN: 1573-4978
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The CD spectra of three polydeoxyribonucleotide complexes, poly(dG-C). poly(dG-C), poly(dA-G). poly(dT-C) and poly(dA-C). poly(dT-G) have been studied as a function of pH at 25°C. Only poly(dA-G). poly(dT-C) showed large hysteresis, analogous to that observed for poly(dG). poly(dC), while the alternating pur-p-pyr containing polymers reversible titration curves exhibited. The hysteretic form R of poly(dA-G). poly(dT-C) is metastable at neutrality and reverts spontaneously and irreversibly to the neutral from N upon heating to about 60°. A whole titration cycle to pH 2.5 and back to neutrality has to be performed in order to obtain the metastable form R again.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00357156
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Protonated polynucleotide structures (1973)
    Springer
    Molecular biology reports 1 (1973), S. 149-154 
    Details
    ISSN: 1573-4978
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The circular dichroism spectra of poly(dG). poly(dC) have been studied as a function of pH in 0.15 M NaCl solution. Acid titration to pH 2.5 showed two transitions, one around pH 5, the second below pH 3. These transitions are disproportionation reactions and are not due to the dissociation of the complexes. Alkaline back titration to neutrality showed only one step above pH 7, without appearance of the intermediate form. The hysteresis loop observed gave rise to a metastable (probably protonated) form at pH 7 which reverted to the neutral form upon heating or alkali treatment. In order to obtain again the metastable hysteretic form, a whole titration cycle to pH 2.5 had to be performed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00357155
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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