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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="en"><front><journal-meta><journal-id journal-id-type="publisher-id">najo</journal-id><journal-title-group><journal-title xml:lang="en">Nanosystems: Physics, Chemistry, Mathematics</journal-title><trans-title-group xml:lang="ru"><trans-title>Наносистемы: физика, химия, математика</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2220-8054</issn><issn pub-type="epub">2305-7971</issn><publisher><publisher-name>Университет ИТМО</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">najo-1066</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="en"><subject>PHYSICS</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ФИЗИКА</subject></subj-group></article-categories><title-group><article-title>The effect of the cell phone radiation on a freely suspended liquid-crystal film</article-title><trans-title-group xml:lang="ru"><trans-title>The effect of the cell phone radiation on a freely suspended liquid-crystal film</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>Bogdanov</surname><given-names>A. A.</given-names></name><name name-style="western" xml:lang="en"><surname>Bogdanov</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Saint Petersburg</p></bio><bio xml:lang="en"><p>Saint Petersburg</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>Denisov</surname><given-names>S. P.</given-names></name><name name-style="western" xml:lang="en"><surname>Denisov</surname><given-names>S. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Moscow</p></bio><bio xml:lang="en"><p>Moscow</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Karetnikov</surname><given-names>A. A.</given-names></name><name name-style="western" xml:lang="en"><surname>Karetnikov</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Saint Petersburg</p></bio><bio xml:lang="en"><p>Saint Petersburg</p></bio><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Kovshik</surname><given-names>A. P.</given-names></name><name name-style="western" xml:lang="en"><surname>Kovshik</surname><given-names>A. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Saint Petersburg</p></bio><bio xml:lang="en"><p>Saint Petersburg</p></bio><email xlink:type="simple">sashakovshik@yandex.ru</email><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Romanov</surname><given-names>V. P.</given-names></name><name name-style="western" xml:lang="en"><surname>Romanov</surname><given-names>V. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Saint Petersburg</p></bio><bio xml:lang="en"><p>Saint Petersburg</p></bio><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Brukkel</surname><given-names>D.</given-names></name><name name-style="western" xml:lang="en"><surname>Brukkel</surname><given-names>D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Moscow</p></bio><bio xml:lang="en"><p>Moscow</p></bio><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">The Federal State Budgetary Institute “The Nikiforov Russian Center of Emergency and Radiation Medicine”<country>Россия</country></aff><aff xml:lang="en">The Federal State Budgetary Institute “The Nikiforov Russian Center of Emergency and Radiation Medicine”<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru">Center of Informatics “GAMMA-7”<country>Россия</country></aff><aff xml:lang="en">Center of Informatics “GAMMA-7”<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru">Saint Petersburg State University<country>Россия</country></aff><aff xml:lang="en">Saint Petersburg State University<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2014</year></pub-date><pub-date pub-type="epub"><day>17</day><month>08</month><year>2025</year></pub-date><volume>5</volume><issue>6</issue><fpage>782</fpage><lpage>788</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Bogdanov A.A., Denisov S.P., Karetnikov A.A., Kovshik A.P., Romanov V.P., Brukkel D., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Bogdanov A.A., Denisov S.P., Karetnikov A.A., Kovshik A.P., Romanov V.P., Brukkel D.</copyright-holder><copyright-holder xml:lang="en">Bogdanov A.A., Denisov S.P., Karetnikov A.A., Kovshik A.P., Romanov V.P., Brukkel D.</copyright-holder><license 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://nanojournal.ifmo.ru/jour/article/view/1066">https://nanojournal.ifmo.ru/jour/article/view/1066</self-uri><abstract><p>   The article presents the results of an experimental study of the effect of the radiofrequency radiation (RF) of a cell phone on a freely suspended liquid-crystal film (FSLCF) as a system that simulates biological structures. The selection of the FSLCF model is theoretically substantiated. A polarizing microscope with a video camera was used to visualize the process under study. The reaction of the FSLCF was analyzed using a specially developed software. The responses of the FSLCF were studied for exposure to the RF radiation in the presence of protective device Gamma 7.N-RT and for the action of a static magnetic field of strength 500 Oe. The RF radiation of a cell phone was found to change the orientation structure of the FSLCF, which, after some time, returns to the nearly initial level despite the presence of external field. The protective device Gamma 7.N-RT attenuates the reaction of the FSLCF. The response of the FSLCF in a static magnetic field remains unchanged during the exposure to the field. These experimental results are evidence that the structure of the freely suspended liquid-crystal film is a viable model for biological structures, and is capable of adapting to the effect of the RF radiation emitted by a cell phone.</p></abstract><trans-abstract xml:lang="ru"><p>   The article presents the results of an experimental study of the effect of the radiofrequency radiation (RF) of a cell phone on a freely suspended liquid-crystal film (FSLCF) as a system that simulates biological structures. The selection of the FSLCF model is theoretically substantiated. A polarizing microscope with a video camera was used to visualize the process under study. The reaction of the FSLCF was analyzed using a specially developed software. The responses of the FSLCF were studied for exposure to the RF radiation in the presence of protective device Gamma 7.N-RT and for the action of a static magnetic field of strength 500 Oe. The RF radiation of a cell phone was found to change the orientation structure of the FSLCF, which, after some time, returns to the nearly initial level despite the presence of external field. The protective device Gamma 7.N-RT attenuates the reaction of the FSLCF. The response of the FSLCF in a static magnetic field remains unchanged during the exposure to the field. These experimental results are evidence that the structure of the freely suspended liquid-crystal film is a viable model for biological structures, and is capable of adapting to the effect of the RF radiation emitted by a cell phone.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>biological structures</kwd><kwd>liquid-crystal film</kwd><kwd>electromagnetic fields</kwd><kwd>orientation structure</kwd></kwd-group><kwd-group xml:lang="en"><kwd>biological structures</kwd><kwd>liquid-crystal film</kwd><kwd>electromagnetic fields</kwd><kwd>orientation structure</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Goodman R., Blank M., Cell phone safety standards should incorporate the bio-logical differences between thermal and electromagnetic responses, Abstract Book 22 Annual Meeting. 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