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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">zhps</journal-id><journal-title-group><journal-title xml:lang="ru">Журнал прикладной спектроскопии</journal-title><trans-title-group xml:lang="en"><trans-title>Zhurnal Prikladnoii Spektroskopii</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0514-7506</issn><publisher><publisher-name>B. I. Stepanov Institute of Physics of the National Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">zhps-1612</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>ПРИБОРЫ И МЕТОДЫ СПЕКТРОСКОПИИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>DEVICES AND METHODS OF SPECTROSCOPY</subject></subj-group></article-categories><title-group><article-title>Анализ пространственных распределений числа фотоотсчетов во флуоресцентной флуктуационной спектроскопии</article-title><trans-title-group xml:lang="en"><trans-title>Analysis of Spatial Photon Counting Distributions in Fluorescence Fluctuation Spectroscopy</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>Скакун</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Skakun</surname><given-names>V. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Минск</p></bio><bio xml:lang="en"><p>Minsk</p></bio><email xlink:type="simple">skakun@bsu.by</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>Хинк</surname><given-names>M. A.</given-names></name><name name-style="western" xml:lang="en"><surname>Hink</surname><given-names>M. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Амстердам</p></bio><bio xml:lang="en"><p>Amsterdam</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>Апанасович</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Apanasovich</surname><given-names>V. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Минск</p></bio><bio xml:lang="en"><p>Minsk</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Белорусский государственный университет</institution></aff><aff xml:lang="en"><institution>Belarusian State University</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Амстердамский университет, Центр передовой микроскопии Антони ван Левенгука</institution></aff><aff xml:lang="en"><institution>University of Amsterdam, dept Molecular Cytology, van Leeuwenhoek Centre for Advanced Microscopy</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>01</day><month>08</month><year>2024</year></pub-date><volume>91</volume><issue>4</issue><fpage>571</fpage><lpage>580</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Скакун В.В., Хинк M.A., Апанасович В.В., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Скакун В.В., Хинк M.A., Апанасович В.В.</copyright-holder><copyright-holder xml:lang="en">Skakun V.V., Hink M.A., Apanasovich V.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://zhps.ejournal.by/jour/article/view/1612">https://zhps.ejournal.by/jour/article/view/1612</self-uri><abstract><p>Предложен метод анализа распределения числа фотоотсчетов (РЧФ), вычисленных по пространству (пикселям) стека флуоресцентных изображений, получаемых в процессе сканирующего измерения в флуоресцентной флуктуационной спектроскопии, позволяющий определять характеристическую яркость и количество молекул исследуемого вещества. Метод применим для эргодических систем и основан на теории анализа гистограмм счета фотонов PCH (Photon Counting Histogram), разработанного для одноточечных измерений. Выполнено тестирование метода на экспериментально полученных изображениях зеленого флуоресцирующего белка. Проведено сравнение полученных результатов с результатами одноточечного эксперимента и метода N&amp;B (Number and Brightness), наиболее часто применяемого для численного анализа стека флуоресцентных изображений, полученных в сканирующих экспериментах. Оценки характеристической яркости и количества молекул исследуемого вещества хорошо согласуются с оценками, полученными с помощью используемых в данной области методов анализа, что позволяет сделать вывод о возможности применения теории метода PCH для анализа пространственных РЧФ, рассчитанных на основе стека изображений. Разработанный метод позволяет получать оценки исследуемых параметров на основе выделенной подобласти одного фрейма изображения.</p></abstract><trans-abstract xml:lang="en"><p>The proposed method for analyzing photon counting distributions (PCD), calculated over the space (pixels) of a stack of fluorescent images obtained in the process of scanning measurement in fluorescence fluctuation spectroscopy, makes it possible to determine the characteristic brightness and number of molecules of the investigated substance. The method is valid for ergodic systems and is based on the theory of analysis of photon count histograms PCH (Photon Counting Histogram), developed for the analysis of single-point measurements. The method has been tested on the experimentally obtained images of green fluorescent protein. The results are compared with the results of a single-point experiment and the N&amp;B (Number and Brightness) method, which is most often used for numerical analysis of a stack of fluorescent images obtained in scanning experiments. The resulting estimates of the characteristic brightness and number of molecules of the calculated substance are in good agreement with the estimates obtained using analysis methods in this area, which allows us to conclude that it is possible to use the theory of the PCH method for the analysis of spatial PCD calculated based on a stack of images. The developed method makes it possible to obtain estimates of the observed parameters based on a selected subregion of one image frame.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>флуоресцентная флуктуационная спектроскопия</kwd><kwd>сканирующая микроскопия</kwd><kwd>анализ распределения числа фотоотсчетов</kwd><kwd>метод N&amp;B</kwd><kwd>анализ гистограмм счета фотонов PCH</kwd><kwd>метод FIDA</kwd><kwd>флуоресцентные изображения</kwd></kwd-group><kwd-group xml:lang="en"><kwd>fluorescence fluctuation spectroscopy</kwd><kwd>scanning microscopy</kwd><kwd>analysis of photocount number distribution</kwd><kwd>N&amp;B method</kwd><kwd>analysis of photon counting histograms</kwd><kwd>FIDA method</kwd><kwd>fluorescent images</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">D. Magde, E. Elson, W. W. Webb. Phys. Rev. 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