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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">vetpatol</journal-id><journal-title-group><journal-title xml:lang="ru">Ветеринарная патология</journal-title><trans-title-group xml:lang="en"><trans-title>Russian Journal of Veterinary Pathology</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2949-4826</issn><publisher><publisher-name>Don State Technical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.23947/1682-5616-2023-22-38-45</article-id><article-id custom-type="elpub" pub-id-type="custom">vetpatol-1839</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>ПАРАЗИТОЛОГИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PARASITOLOGY</subject></subj-group></article-categories><title-group><article-title>Развитие ооцитов иксодового клеща рода Dermacentor</article-title><trans-title-group xml:lang="en"><trans-title>Oocytes Development in Ixodid Tick of the Genus Dermacentor</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0004-0524-5354</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Проскурин</surname><given-names>Д. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Proskurin</surname><given-names>D. А.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Проскурин Даниил Алиевич, аспирант </p><p>Ставропольский край, г. Ставрополь, пер. Зоотехнический, 1</p></bio><bio xml:lang="en"><p>Stavropol </p></bio><email xlink:type="simple">pro.kish@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0247-8633</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Дилекова</surname><given-names>О. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Dilekova</surname><given-names>O. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Дилекова Ольга Владимировна, доцент, доктор биологических наук</p><p>Ставропольский край, г. Ставрополь, пер. Зоотехнический, 1</p><p> </p></bio><bio xml:lang="en"><p>Stavropol </p></bio><email xlink:type="simple">dilekova2009@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Ставропольский государственный аграрный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Stavropol State Agrarian University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>20</day><month>03</month><year>2023</year></pub-date><volume>22</volume><issue>1</issue><fpage>38</fpage><lpage>45</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Проскурин Д.А., Дилекова О.В., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Проскурин Д.А., Дилекова О.В.</copyright-holder><copyright-holder xml:lang="en">Proskurin D.А., Dilekova O.V.</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.vetpat.ru/jour/article/view/1839">https://www.vetpat.ru/jour/article/view/1839</self-uri><abstract><p>Введение. Иксодовые клещи имеют широкое распространение и являются переносчиками многих инфекционных и инвазионных заболеваний. К трансмиссивным клещевым заболеваниям относятся боррелиоз, вирусный энцефалит, анаплазмоз, эрлихиоз и бабезиоз, которые могут быть опасны как для человека, так и для животных. Кроме того, иксодовые клещи имеют высокую плодовитость. Самка данного эктопаразита способна отложить до 20 тысяч яиц одномоментно. Поэтому целью данного исследования стало изучение процесса развития эктопаразитов, а именно динамика процесса созревания ооцитов иксодовых клещей рода Dermacentor.Материалы и методы. Объектом исследования служили иксодовые клещи рода Dermacentor. Исследования проводились на базе кафедры паразитологии и ветеринарно-санитарной экспертизы, анатомии и патанатомии им. проф. С. Н. Никольского и на базе научно-диагностического и лечебного ветеринарного центра ФГБОУ ВО «Ставропольский государственный аграрный университет», а также на базе ветеринарных клиник ИП Заиченко «Ветеринарный центр им. Пирогова». Материалом для исследования послужила репродуктивная система самок. Самки подвергались проводке и заливке по стандартной гистологической технике, после чего делали срезы толщиной 5–7 мкм. Для рутинного исследования гистологические срезы окрашивали гематоксилином и эозином, а также по Маллори. Микроскопическое исследование гистологических срезов самок клеща проводилось при помощи микроскопа Olympus BX53 (Япония) при увеличении ×4, ×20, ×40, ×100.Результаты исследования. Макроскопическое исследование самок иксодового клеща рода Dermacentor показало, что яичник представляет собой непарный орган подковообразной формы, на котором прикреплены ооциты. Отмечается, что ооциты развиваются асинхронно. Незрелые ооциты преобладали преимущественно в дистальной части яичника, тогда как зрелые — в проксимальной. Ооциты данного вида клещей подразделяется на пять основных стадий созревания и описываются на основе внешнего вида цитоплазмы, наличия зародышевого пузырька, наличия гранул желтка и формирования хориона, а также морфометрических данных. Процесс созревания ооцитов разных стадий нелинеен. При вителлогенезе отмечается активная достоверная динамика роста — при развитии от I до V стадии наблюдается увеличение в размерах в 55 раз.Обсуждение и заключения. У самок клещей рода Dermacentor созревание ооцитов проходит в 5 стадий. Процесс созревания ооцитов разных стадий не имеет линейности, так как в яичнике происходят одновременно как митотические, так и мейотические процессы. При этом в развитии ооцитов отмечается активная достоверная динамика роста. </p></abstract><trans-abstract xml:lang="en"><p>Introduction. Ixodid ticks are the carriers of many infectious and parasitic diseases. Transmissible tick-borne diseases include borreliosis, viral encephalitis, anaplasmosis, ehrlichiosis and babesiosis, they can be dangerous for both humans and animals. Since the forest areas stopped being treated with pesticides, the reproduction of ixodid ticks became almost unregulated, and their population is constantly growing. In addition, ixodid ticks, the carriers of a number of dangerous anthropozoonosis, have high fecundity.Therefore, the aim of the study was to investigate the process of ectoparasites development, specifically, the dynamics of the oocytes maturation process in ixodid ticks of the genus Dermacentor. Materials and methods. The ixodid ticks of the genus Dermacentor were the object of the study. The study was conducted on the basis of the Chair “Parasitology and Veterinary-Sanitary Expertise, Anatomy and Pathoanatomy named after Prof. S. N. Nikolsky” and the Scientific-Diagnostic and Medical Veterinary Center of the Federal State Budgetary Educational Institution of Higher Education "Stavropol State Agrarian University", as well as on the basis of veterinary clinics "Veterinary Center named after Pirogov” of the individual entrepreneur Zaichenko. The reproductive system of females served the material for the research. The females were treated and filled into paraffin according to the routine histological technique, afterwards the sections of 5-7 µm. thick were made. For routine examination, histological sections were stained with hematoxylin and eosin, as well as by Mallory staining method. Microscopic examination of the histological sections of female ticks was carried out using the Olympus BX53 microscope (Japan) at 4×, 20×, 40×, 100× magnification.Results. The macroscopic examination of female ixodid ticks of the genus Dermacentor showed that ovary is an azygos, horseshoe-shaped organ to which oocytes are attached. It was observed that oocytes develop asynchronously. Immature oocytes predominated mostly in the distal part of the ovary, while mature — in the proximal. The oocytes of this species of tick are classified by five main stages of maturation and are described based on the cytoplasm external view, the presence of the germinal vesicle, the presence of yolk granules and the chorion formation, and the morphometric data. The process of oocytes maturation at different stages is not linear. During vitellogenesis, the active and verified dynamics of growth is recorded from I to V stage of oocytes development the increase of their size by 55 times is observed.Discussion and conclusions. In female ticks of the genus Dermacentor, maturation of oocytes goes through 5 stages. The process of oocytes maturation at different stages is not linear, since both mitotic and meiotic processes occur simultaneously in the ovary. At the same time, in the oocytes development the active verified dynamics of growth is recorded.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>Dermacentor</kwd><kwd>иксодовые клещи</kwd><kwd>самки клеща</kwd><kwd>эктопаразиты</kwd><kwd>ооциты</kwd><kwd>яичник</kwd><kwd>виттелогенез</kwd><kwd>морфометрия</kwd><kwd>гистология</kwd><kwd>паразитология</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Dermacentor</kwd><kwd>ixodid ticks</kwd><kwd>female ticks</kwd><kwd>ectoparasites</kwd><kwd>oocytes</kwd><kwd>ovary</kwd><kwd>vitellogenesis</kwd><kwd>morphometry</kwd><kwd>histology</kwd><kwd>parasitology</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Выражаем признательность сотрудникам кафедры паразитологии, ВСЭ, анатомии и патанатомии им. проф. Никольского за поддержку исследования, а также благодарность ветеринарным клиникам ИП Заиченко «Ветеринарный центр им. Пирогова» в проведении исследования.</funding-statement><funding-statement xml:lang="en">The authors express their gratitude to the Chair “Parasitology and Veterinary-Sanitary Expertise, Anatomy and Pathoanatomy named after Prof. S. N. Nikolsky for support of the study, and to the veterinary clinics "Veterinary Center named after Pirogov” of the individual entrepreneur Zaichenko.</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">Leucine aminopeptidase, HlLAP, from the ixodid tick Haemaphysalis longicornis, plays vital roles in the development of oocytes / Hatta Takeshi, Naotoshi Tsuji, Takeharu Miyoshi [et al.] // Parasitology International. — 2010. Vol. 59. 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