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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">zhps</journal-id><journal-title-group><journal-title xml:lang="ru">Журнал прикладной спектроскопии</journal-title><trans-title-group xml:lang="en"><trans-title>Zhurnal Prikladnoii Spektroskopii</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0514-7506</issn><publisher><publisher-name>B. I. Stepanov Institute of Physics of the National Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">zhps-1347</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>МОЛЕКУЛЯРНАЯ СПЕКТРОСКОПИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MOLECULAR SPECTROSCOPY</subject></subj-group></article-categories><title-group><article-title>Механизм связывания метиленового синего с одноцепочечными синтетическими полинуклеотидами poly(rA) и poly(rU)</article-title><trans-title-group xml:lang="en"><trans-title>Mechanism of Binding of Methylene Blue with Single-Stranded Synthetic Polynucleotides Poly(rA) and Poly(rU)</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Мовсесян</surname><given-names>З. О.</given-names></name><name name-style="western" xml:lang="en"><surname>Movsesyan</surname><given-names>Z. O.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ереван</p></bio><bio xml:lang="en"><p>Yerevan</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Антонян</surname><given-names>А. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Antonyan</surname><given-names>A. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ереван</p></bio><bio xml:lang="en"><p>Yerevan</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Вардеванян</surname><given-names>П. О.</given-names></name><name name-style="western" xml:lang="en"><surname>Vardevanyan</surname><given-names>P. O.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ереван</p></bio><bio xml:lang="en"><p>Yerevan</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Ереванский государственный университет</institution></aff><aff xml:lang="en"><institution>Yerevan State University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>23</day><month>08</month><year>2023</year></pub-date><volume>90</volume><issue>4</issue><fpage>547</fpage><lpage>552</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Мовсесян З.О., Антонян А.П., Вардеванян П.О., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Мовсесян З.О., Антонян А.П., Вардеванян П.О.</copyright-holder><copyright-holder xml:lang="en">Movsesyan Z.O., Antonyan A.P., Vardevanyan P.O.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://zhps.ejournal.by/jour/article/view/1347">https://zhps.ejournal.by/jour/article/view/1347</self-uri><abstract><p>Изучено связывание тиазинового красителя метиленового синего (МС) с одноцепочечными (оц-) синтетическими полирибонуклеотидами полирибоадениловой (poly(rA)) и полиуридиловой (poly(rU)) кислот методами абсорбционной спектроскопии и УФ-плавления. Обнаружено, что механизмы связывания МС с poly(rA) и с poly(rU) существенно различаются. Полученные данные указывают на то, что основной способ взаимодействия МС с оц-poly(rA) соответствует полуинтеркаляции, с оц-poly(rU) — электростатическому связыванию. Выявлено, что МС способствует образованию гибридного дуплекса poly(rA)-poly(rU).</p></abstract><trans-abstract xml:lang="en"><p>The study of the binding of thiazine dye methylene blue (MB) with single-stranded (ss-) synthetic polyribonucleotides poly(rA) and poly(rU) has been carried out with the methods of absorption spectroscopy and UV-melting. It has been revealed that the binding mechanisms of MB to poly(rA) significantly differs from that one of MB binding to poly(rU). The obtained data indicate that the main binding mode of MB to ss-poly(rA) corresponds to semi-intercalation, while at the binding to poly(rU) — electrostatic binding. MB has been also found out to contribute to the formation of hybrid duplex poly(rA)-poly(rU).</p></trans-abstract><kwd-group xml:lang="ru"><kwd>метиленовый синий</kwd><kwd>полуинтеркаляция</kwd><kwd>полирибоадениловая и полиуридиловая кислоты</kwd><kwd>электростатическое связывание</kwd><kwd>абсорбция</kwd><kwd>УФ-плавление</kwd></kwd-group><kwd-group xml:lang="en"><kwd>methylene blue</kwd><kwd>semi-intercalation</kwd><kwd>poly(rA)</kwd><kwd>poly(rU)</kwd><kwd>electrostatic binding</kwd><kwd>absorption</kwd><kwd>UV-melting</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено при финансовой поддержке комитета по науке Республики Армения (проект № 21T-1F063).</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">A. B. Pradhan, L. Haque, S. R. S. Das. 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