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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">biologyscience</journal-id><journal-title-group><journal-title xml:lang="ru">Тимирязевский биологический журнал</journal-title><trans-title-group xml:lang="en"><trans-title>Timiryazev Biological Journal</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2949-4710</issn><publisher><publisher-name>ФГБОУ ВО РГАУ-МСХА имени К.А. Тимирязева (ФГБОУ ВО РГАУ-МСХА имени К.А. Тимирязева)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.26897/2949-4710-2025-3-1-4-01</article-id><article-id custom-type="elpub" pub-id-type="custom">biologyscience-210</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>4 - ЗООЛОГИЯ, ФИЗИОЛОГИЯ ЧЕЛОВЕКА И ЖИВОТНЫХ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>4 - ZOOLOGY, HUMAN AND ANIMAL PHYSIOLOGY</subject></subj-group></article-categories><title-group><article-title>Морфологическая и функциональная характеристика лимфоидной ткани среднего отдела кишечника осетровых видов рыб на примере стерляди (Acipenser ruthenus)</article-title><trans-title-group xml:lang="en"><trans-title>Morphological and functional characteristics of lymphoid tissue in the midgut of sturgeon fish species: a case study of the sterlet (Acipenser ruthenus)</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2196-5421</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кочетков</surname><given-names>Н. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Kochetkov</surname><given-names>N. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Никита Ильич Кочетков, младший научный сотрудник центра «Аквакультуры» </p><p>109004, г. Москва, ул. Земляной Вал, 73</p></bio><bio xml:lang="en"><p>Nikita I. Kochetkov, Junior Research Associate at the Aquaculture Center</p><p>73 Zemlyanoy Val St., Moscow, 109004</p></bio><email xlink:type="simple">samatrixs@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1715-057X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Никифоров-Никишин</surname><given-names>Д. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Nikiforov-Nikishin</surname><given-names>D. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Дмитрий Львович Никифоров-Никишин, кандидат биологических наук, ведущий научный сотрудник центра «Аквакультуры»</p><p>109004, г. Москва, ул. Земляной Вал, 73</p></bio><bio xml:lang="en"><p>Dmitry L. Nikiforov-Nikishin, CSc (Bio), Leading Research Associate at the Aquaculture Center</p><p>73 Zemlyanoy Val St., Moscow, 109004</p></bio><email xlink:type="simple">niknikdl@rambler.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Гаврилин</surname><given-names>К. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Gavrilin</surname><given-names>K. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Кирилл Владимирович Гаврилин, доктор биологических наук, директор по развитию проектов в области биотехнологии и аквакультуры</p><p>677027, Республика Саха (Якутия), г. Якутск, ул. Октябрьская, 18</p></bio><bio xml:lang="en"><p>Kirill V. Gavrilin, DSc (Bio), Director for Biotechnology and Aquaculture Project Development</p><p>18 Oktyabrskaya St., Yakutsk, 677027, Republic of Sakha (Yakutia)</p></bio><email xlink:type="simple">k.gavrilin@yandex.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0004-6392-3168</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Белинский</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Belinsky</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Белинский Антон Андреевич, аспирант кафедры зоологии</p><p>127550, г. Москва, Тимирязевская ул., 49</p></bio><bio xml:lang="en"><p>Anton A. Belinsky, postgraduate student of the Department of Zoology</p><p>49 Timiryazevskaya St., Moscow, 127434</p></bio><email xlink:type="simple">belinsky@rgau-msha.ru</email><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Московский государственный университет технологий и управления им. К.Г. Разумовского (ПКУ)</institution><country>Россия</country></aff><aff xml:lang="en"><institution>K.G. Razumovsky Moscow State University of Technologies and Management (the First Cossack University)</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Национальный фонд экологической защиты и развития Крайнего Севера и приравненных к ним местностей «Якутия»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National Fund for Environmental Protection and Development of the Far North and Equated Localities “Yakutia”</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Российский государственный аграрный университет – МСХА имени К.А. Тимирязева</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Russian State Agrarian University – Moscow Timiryazev Agricultural Academy</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>27</day><month>08</month><year>2025</year></pub-date><volume>3</volume><issue>1</issue><fpage>202531401</fpage><lpage>202531401</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Кочетков Н.И., Никифоров-Никишин Д.Л., Гаврилин К.В., Белинский А.А., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Кочетков Н.И., Никифоров-Никишин Д.Л., Гаврилин К.В., Белинский А.А.</copyright-holder><copyright-holder xml:lang="en">Kochetkov N.I., Nikiforov-Nikishin D.L., Gavrilin K.V., Belinsky A.A.</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://www.bioscience-journal.com/jour/article/view/210">https://www.bioscience-journal.com/jour/article/view/210</self-uri><abstract><p>В работе приведены результаты изучения гистологического строения и качественного состава клеточных элементов гемопоэтической ткани, ассоциированной со средним отделом кишечника стерляди (Acipenser ruthenus). Показано, что лимфоидная ткань кишечника стерляди включает в себя островки лимфоидной ткани, ограниченные ретикулярной тканью/слизистой оболочкой, а также лимфоциты, ассоциированные со слизистой оболочкой (интраэпителиальные) и с собственной пластиной слизистой кишечника (лимфоциты lamina propria). Дополнительно в ткани обнаружены эозинофильные клетки. В слизистой оболочке кишечника наиболее встречаемым типом клеток являлись интраэпителиальные лимфоциты (8,9 кл/100 мкм) и лимфоциты lamina propria (7,1 кл/100 мкм). На мазках лимфоидной ткани кишечника стерляди были обнаружены следующие типы клеток лимфоидного ряда (в порядке убывания): лимфоциты (64,4%), пролимфоциты (6,5%), плазмоциты (3,9%), лимфобласты (2,9%) и проплазмоциты (1,5%). Морфометрические изменения в ряду лимфатических клеток на мазках лимфоидной ткани выражались в уменьшении размеров ядра и цитоплазмы. Морфология, качественный состав клеток, а также функциональных характеристик позволили отнести лимфоидную ткань кишечника стерляди к кишечно-ассоциированной лимфоидной ткани. Полученные результаты могут быть использованы для оценки иммунного статуса культивируемых рыб, определения эффективности иммуномодулирующих кормов и кормовых добавок, для мониторинга и диагностики диких популяций рыб, а также могут способствовать пониманию эволюции лучеперых рыб.</p></abstract><trans-abstract xml:lang="en"><p>The paper presents the results of the study of the histological structure and qualitative composition of cellular elements of the haematopoietic tissue associated with the midgut of the sterlet (Acipenser ruthenus). It was shown that the lymphoid tissue of the sterlet intestine contains islands of lymphoid tissue bounded by reticular tissue/mucosa, as well as lymphocytes associated with the mucosa (intraepithelial) and with the intestinal mucosal plate (lamina propria lymphocytes). Eosinophilic cells were also found in the tissue. The most common cell types in the intestinal mucosa were intraepithelial lymphocytes (8.9 cell/100 μm) and lamina propria lymphocytes (7.1 cell/100 μm). Smears of sterlet intestinal lymphoid tissue showed the following lymphoid cell types (in descending order): lymphocytes (64.4%), prolymphocytes (6.5%), plasmocytes (3.9%), lymphoblasts (2.9%) and proplasmocytes (1.5%). Morphometric changes in a number of lymphoid cells in lymphoid tissue smears were expressed as a decrease in the size of the nucleus and cytoplasm. The morphology, qualitative cell composition and functional characteristics allowed the classification of the lymphoid tissue of the sterlet intestine as intestine-associated lymphoid tissue. The results obtained can be used to assess the immune status of cultured fish, to determine the effectiveness of immunomodulatory feeds and feed additives, to monitor and diagnose wild fish populations, and to contribute to the understanding of the evolution of ray-finned fish.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>гистология</kwd><kwd>морфология</kwd><kwd>цитология</kwd><kwd>желудочно-кишечный тракт</kwd><kwd>средний отдел кишечника</kwd><kwd>осетровые</kwd><kwd>лимфоциты</kwd><kwd>морфологическая характеристика лимфоидной ткани</kwd><kwd>функциональная характеристика лимфоидной ткани</kwd><kwd>стерлядь</kwd><kwd>Acipenser ruthenus</kwd></kwd-group><kwd-group xml:lang="en"><kwd>histology</kwd><kwd>morphology</kwd><kwd>cytology</kwd><kwd>gastrointestinal tract</kwd><kwd>midgut</kwd><kwd>sturgeon</kwd><kwd>lymphocytes</kwd><kwd>morphological characteristics of lymphoid tissue</kwd><kwd>functional characteristics of lymphoid tissue</kwd><kwd>sterlet</kwd><kwd>Acipenser ruthenus</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">Birstein V.J., Waldman J.R., Bemis W.E. 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