Geodesic
Структурные особенности ДНК в щелочной среде
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (1987), pp. 80-85.

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A specific mechanism of deprotonization of DNA nitrogen bases in alkaline media (pH>7.0) has been suggested. It has been shown that at pH>10.3 deprotonization of nitrogen bases in GC-rich helical regions can take place. It has been estimated that the character of DNA helix-coil transition temperature and interval dependences on pH is due to deprotonization selectivity of nitrogen bases only. 
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V. M. Aslanian; Y. B. Dalyan; S. G. Haroutiunian. Структурные особенности ДНК в щелочной среде. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (1987), pp. 80-85. http://geodesic.mathdoc.fr/item/UZERU_1987_2_a11/

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