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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">kaz65</journal-id><journal-title-group><journal-title xml:lang="ru">Почвоведение и агрохимия</journal-title><trans-title-group xml:lang="en"><trans-title>Soil Science and Agrichemistry</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1999-740X</issn><issn pub-type="epub">2959-3433</issn><publisher><publisher-name>Казахский научно-исследовательский институт почвоведения и агрохимии имени У.У. Успанова</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.51886/1999-740X_2022_4_10</article-id><article-id custom-type="elpub" pub-id-type="custom">kaz65-684</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>Биология почв</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Soil biology</subject></subj-group></article-categories><title-group><article-title>Влияние высоких концентраций субстрата на каталазной реакции в суглинистой почве (провинция Ыгдыр, Турция). II. Определение кинетических параметров фермента каталазы в почве</article-title><trans-title-group xml:lang="en"><trans-title>Influence of high substrate concentrations on catalase reaction in loamy soil (Ygdir province, Turkey). II. Determination of the kinetic parameters of the enzyme catalases in soil</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>Микаилсой</surname><given-names>Ф. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Mikailsoy</surname><given-names>F. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Фариз Дунямалыоглу Микаилсой</p><p>сельскохозяйственный факультет</p><p>кафедра почвоведения и питания растений</p><p>76000</p><p>кампус имени Шехит Бюлент Юртсевен</p><p>Ыгдыр</p></bio><bio xml:lang="en"><p>Faculty of Agriculture</p><p>Department of Soil Science and Plant Nutrition</p><p>76000</p><p>Sehit Bulent Yurtseven Campus</p><p>Igdir</p></bio><email xlink:type="simple">fariz.mikailsoy@igdir.edu.tr</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Университет «Ыгдыр»<country>Турция</country></aff><aff xml:lang="en">University "Igdir"<country>Turkey</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>31</day><month>12</month><year>2022</year></pub-date><volume>0</volume><issue>4</issue><fpage>10</fpage><lpage>21</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Микаилсой Ф.Д., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Микаилсой Ф.Д.</copyright-holder><copyright-holder xml:lang="en">Mikailsoy F.D.</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://journal.soil.kz/jour/article/view/684">https://journal.soil.kz/jour/article/view/684</self-uri><abstract><p>   В данном исследовании были проведены анализы при различных концентрациях (3, 6, 9, 12, 15, 18, 21, 24, 30 %) субстрата H2O2 для расчета кинетических параметров фермента каталазы почвы (Vmax, KM, Vmax / KM, KSEE, [S]opt и υ0,max). Чтобы рассчитать эти параметры, сначала были рассчитаны значения скорости (υ) с использованием результатов анализа. Затем были определены различные модели, выражающие отношение продукт-субстрат: [P] = f([S]). Далее, по критериям выбора модели (R2, R2adj, σ, A, D, UII, AIC) определялась наиболее подходящая модель, отражающая соотношение [P] = f([S]). Начальная скорость в соответствии с установленной моделью была рассчитана по формуле: υ0=d([P])/dt│t=0. В результате исследования установлено, что засоленость и щелочность снижают активность каталазы. По мере увеличения концентрации субстрата наблюдалось значительное ингибирование ферментативной реакции каталазы. Значения коэффициента разложения (KESS) ферментативной реакции выше в засоленных почвах, то есть наблюдается торможение образования продуктов.</p></abstract><trans-abstract xml:lang="en"><p>   In this study, analyzes were performed at various concentrations (3, 6, 9, 12, 15, 18, 21, 24, 30 %) of the H2O2 substrate to calculate the kinetic parameters of the soil catalase enzyme (Vmax, KM, Vmax / KM, KSEE, [S]opt and υ0,max). In order to calculate these parameters, the velocity values (v) were first calculated using the results of the analysis. Various models were then defined expressing the product-substrate relationship: [P] = f([S]). Further, according to the model selection criteria (R2, R2adj, σ, A, D, UII, AIC), the most suitable model was determined, reflecting the ratio [P] = f([S]). The initial speed in accordance with the established model was calculated by the formula: υ0=d([P])/dt│t=0. As a result of the study, it was found that salinity and alkalinity reduce the activity of catalase. As the substrate concentration increased, significant inhibition of the catalase enzymatic reaction was observed. The values of the coefficient of decomposition (KESS) of the enzymatic reaction are higher in saline soils, that is, inhibition of the formation of products is observed.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>почва</kwd><kwd>каталаза</kwd><kwd>ингибирование субстратом</kwd><kwd>кинетические параметры</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Soil</kwd><kwd>catalase</kwd><kwd>substrate inhibition</kwd><kwd>kinetic parameters</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">Звягинцев Д. Г. Методы почвенной микробиологии и биохимии / Д. Г. Звягинцев. – М.: МГУ, 1991. – 304 с.</mixed-citation><mixed-citation xml:lang="en">Zvyagintsev D. G. 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