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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Doklady Biological Sciences</journal-id><journal-title-group><journal-title xml:lang="en">Doklady Biological Sciences</journal-title><trans-title-group xml:lang="ru"><trans-title>Доклады Российской академии наук. Науки о жизни</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2686-7389</issn><issn publication-format="electronic">3034-5057</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">684076</article-id><article-id pub-id-type="doi">10.31857/S2686738925020197</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Unusual pattern of cerebral electrical activity in the mongolian hamster (<italic>Allocricetulus curtatus</italic>) during heterothermia</article-title><trans-title-group xml:lang="ru"><trans-title>Необычный характер электрической активности головного мозга монгольского хомячка (<italic>Allocricetulus curtatus</italic>) при гетеротермии</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kovalzon</surname><given-names>V. M.</given-names></name><name xml:lang="ru"><surname>Ковальзон</surname><given-names>В. М.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>kovalzon@sevin.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Komarova</surname><given-names>A. D.</given-names></name><name xml:lang="ru"><surname>Комарова</surname><given-names>А. Д.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>kovalzon@sevin.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Smagina</surname><given-names>M. Yu.</given-names></name><name xml:lang="ru"><surname>Смагина</surname><given-names>М. Ю.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>kovalzon@sevin.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Feoktistova</surname><given-names>N. Yu.</given-names></name><name xml:lang="ru"><surname>Феоктистова</surname><given-names>Н. Ю.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>kovalzon@sevin.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Surov</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Суров</surname><given-names>А. В.</given-names></name></name-alternatives><bio xml:lang="en"><p>Corresponding Member of the RAS</p></bio><bio xml:lang="ru"><p>член-корреспондент РАН</p></bio><email>kovalzon@sevin.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Федеральное государственное бюджетное учреждение науки Институт проблем экологии и эволюции им. А.Н. Северцова Российской академии наук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-04-15" publication-format="electronic"><day>15</day><month>04</month><year>2025</year></pub-date><volume>521</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>285</fpage><lpage>292</lpage><history><date date-type="received" iso-8601-date="2025-06-12"><day>12</day><month>06</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-06-12"><day>12</day><month>06</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/2686-7389/article/view/684076">https://journals.eco-vector.com/2686-7389/article/view/684076</self-uri><abstract xml:lang="en"><p>Electroencephalogram (EEG), brain and abdominal temperature, and motor activity were recorded for the first time in 18 adult males of facultative hibernator, the Mongolian hamster, during hibernation under controlled laboratory conditions in winter. At room temperature, clear synchronous circadian rhythms of motor activity and body temperature were observed. In most animals, a gradual decrease in external temperature (from 24°C to 4°C) led to a significant increase in motor activity, combined with an increase in the amplitude of circadian oscillations of body temperature. Six hamsters demonstrated torpor bouts and hibernation with radical changes in the EEG up to reaching the isoelectric line, as well as the disappearance of oscillations of brain temperature. It has been found that Mongolian hamsters can easily enter and exit both a state of torpor and a fairly deep hibernation with a decrease in body temperature down to 10ºC during normal sleep periods.</p></abstract><trans-abstract xml:lang="ru"><p>Впервые зарегистрирована электроэнцефалограмма (ЭЭГ), температура мозга и брюшной полости, а также двигательная активность у 18 взрослых самцов факультативного гибернатора – монгольского хомячка – в ходе зимней спячки в контролируемых лабораторных условиях в зимний период. При комнатной температуре наблюдались четкие синхронные циркадианные ритмы двигательной активности и температуры тела. У большинства животных постепенное понижение внешней температуры (от 24°C до 4°С) приводило к значительному повышению двигательной активности, сочетавшемуся с увеличением размаха циркадианных колебаний температуры тела. Шесть хомячков демонстрировали бауты торпора и гибернацию с радикальными изменениями ЭЭГ вплоть до достижения изоэлектрической линии, а также исчезновения колебаний температуры мозга. Обнаружено, что монгольские хомячки могут на фоне обычных периодов сна легко входить и выходить как в состояние торпора, так и довольно глубокую гибернацию со снижением температуры тела вплоть до 10ºC.</p></trans-abstract><kwd-group xml:lang="en"><kwd>hibernation</kwd><kwd>EEG</kwd><kwd>body temperature</kwd><kwd>brain temperature</kwd><kwd>motor activity</kwd><kwd>Mongolian hamster</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>зимняя спячка</kwd><kwd>ЭЭГ</kwd><kwd>температура тела</kwd><kwd>температура мозга</kwd><kwd>двигательная активность</kwd><kwd>монгольские хомячки</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Калабухов Н.И. Спячка млекопитающих. 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