ОПРЕДЕЛЕНИЕ МИКРОЭЛЕМЕНТОВ В РАСТЕНИЯХ МЕТОДОМ ДУГОВОЙ АТОМНО-ЭМИССИОННОЙ СПЕКТРОМЕТРИИ

Plants connect together the atmosphere, the biosphere and the hydrosphere, participate in the migration of chemical elements and indicate an anthropogenic environmental pollution. For this reason, it is important to determine the content of a wide range of essential and toxic elements in plants. Atomic emission spectrometry with different sources of excitation of atoms is one of the most frequently used instrumental methods for determining the elemental composition of plants. Express determination of 23 essential and toxic elements in plant powders (without ashing and acid decomposition) using the atomic emission spectrometry with arc discharge (DC-arc AES) was developed. The special ways of obtaining spectra and of spectral information processing provided an increased accuracy of the analytical results in the concentration ranges from n∙(10-6-10-4) to 10 wt. %. The correctness of the results of the developed technique was verified by the means of the encrypted certified reference materials of the plants and matching them with the results obtained by the certified techniques of atomic emission and mass spectrometry with inductively coupled plasma.  The application of the DC-arc AES technique to determine trace elements in plants from the ecologically clean and polluted areas with different landscapes, provided new analytical data for the interdisciplinary research. These data are traceable to the well-known international certified reference materials of plants.Keywords: plants, trace elements, direct current arc atomic emission spectrometry, traceability.DOI: http://dx.doi.org/10.15826/analitika.2019.23.3.011(Russian)I.E. Vasil'eva and E.V. ShabanovaVinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences, Russian Federation, 664033, Irkutsk, Favorsky Str., 1AРастения связывают воедино атмосферу, биосферу и гидросферу, участвуют в миграции химических элементов и указывают на антропогенное загрязнение окружающей среды. Поэтому определение в растениях содержаний широкого круга эссенциальных и токсичных элементов имеет важное значение. Разработана экспрессная методика определения 23 микроэлементов в порошках растительных материалов (без озоления и кислотного разложения) методом атомно-эмиссионной спектрометрии с дуговым разрядом (АЭС-ДР). Применение специальных приемов получения и обработки спектральной информации обеспечило повышение точности результатов анализа в диапазонах n ∙(10-6-10-4) до 10 % мас. Правильность результатов подтверждена контролем по зашифрованным стандартным образцам состава растений и сравнением с данными, полученными по аттестованным методикам атомно-эмиссионной и масс-спектрометрии с индуктивно связанной плазмой. Методика АЭС-ДР применима для определения элементов в растениях с экологически чистых и загрязненных территорий, различных по ландшафту; обеспечивает получение новых аналитических данных, которые подтверждены прослеживаемостью к известным международным стандартным образцам состава растений. Ключевые слова: растения, микроэлементы, атомно-эмиссионная спектрометрия с дуговым разрядом, прослеживаемость результатовDOI: http://dx.doi.org/10.15826/analitika.2019.23.3.01

Micro-relief and roughness of the surface of the profiled sulfocation-exchange membrane after its contact with phenylalanine solution

The work was conducted under financial support of RFBR (project N 18-08-01260)

Fe/TiO2 composite coatings: electrodeposition and application for photo-catalytic dye degradation

The electrodeposition of iron-titania composite coatings from a methanesulfonate plating bath is studied in this work. The TiO2 content in deposits is shown to increase with increasing titania concentration in suspension electrolyte and decreasing cathode current density. The kinetics of composite Fe/TiO2 electrodeposition obeys the model proposed by Guglielmi. The photo-catalytic activity of synthesized Fe/TiO2 composite electrochemical coatings was estimated in the model reaction of decomposition of Methyl Orange dye in an alkaline solution. The use of the Fe/TiO2 composite electroplated films as a photo-catalyst allows accelerating the decomposition of Methyl Orange dye in aqueous media under the action of UV radiation

Noise studies of magnetization dynamics in dilute magnetic semiconductor heterostructures

We study theoretically and experimentally the frequency and temperature dependence of resistivity noise in semiconductor heterostructures delta-doped by Mn. The resistivity noise is observed to be non-monotonous as a function of frequency. As a function of temperature, the noise increases by two orders of magnitude for a resistivity increase of about 50%. We study two possible sources of resistivity noise -- dynamic spin fluctuations and charge fluctuations, and find that dynamic spin fluctuations are more relevant for the observed noise data. The frequency and temperature dependence of resistivity noise provide important information on the nature of the magnetic interactions. In particular, we show how noise measurements can help resolve a long standing debate on whether the Mn-doped GaAs is an p-d Zener/RKKY or double exchange ferromagnet. Our analysis includes the effect of different kinds of disorder such as spin-glass type of interactions and a site-dilution type of disorder. We find that the resistivity noise in these structures is well described by a disordered RKKY ferromagnet model dynamics with a conserved order parameter.Comment: 15 pages, 7 eps figures, published versio

Polarity and structure of 2-(1-methylbenzimidazol-2-yl)-1-phenyl- and -1,2-diphenyl-1-nitroethenes

Polarity of 2-(1-methylbenzimidazol-2-yl)-1-phenyl- and -1,2-diphenyl-1-nitroethenes was determined and their structure was studied using electronic and 1H, 13C NMR spectroscopy, dipole moments measuring, XRD analysis, and quantum-chemical calculations. It was shown that the 2-(1-methylbenzimidazol-2-yl)-1-nitro-1-phenylethene has Z-configuration both in crystal and solution. The nitro group and benzimidazole substituent in its molecule are removed from the plane of the double bond. For 1,2-diphenyl-1-nitroethene E-structure is typical. © 2012 Pleiades Publishing, Ltd

Клинические варианты кашлевого рефлекса и их коррекция

Cough is one of the commonest causes of seeking for medical aid. Cough, especially chronic cough, significantly reduces quality of life, disturbs sleep, physical and intellectual activity. Given the fact that cough is not an independent disease, but is a clinical sign (often the only sign) of a disease or a condition, attempts to resolve this symptom without specifying the nature of cough are incorrect. Unfortunately, the cause of cough cannot be established in some cases; patients suffering from chronic cough of unknown etiology account for 10 to 38% and are treated symptomatically even in countries with a high level of medicine. Physicians should aware of that the therapeutic success is always a result of correct diagnostic work-up.Кашель является одной из самых частых причин обращений к врачу общей практики. При кашле, в особенности хроническом, существенно снижается качество жизни пациентов, нарушается сон, физическая и интеллектуальная активность. С учетом того, что кашель – не самостоятельное заболевание, а клинический симптом (нередко единственный) какого-либо заболевания или патологического состояния, попытки устранения этого симптома без уточнения природы кашля ошибочны. К сожалению, в ряде случаев причину кашля установить не удается: даже в странах с высоким уровнем диагностики пациенты, страдающие хроническим кашлем неясной этиологии, составляют от 10 до 38 % и лечатся, как правило, симптоматически. Нужно иметь в виду, что успех от назначенной терапии всегда есть результат грамотно проведенной диагностики основного заболевания

ХИМИЯ И ФУНКЦИОНАЛЬНЫЕ МАТЕРИАЛЫ. НАУЧНАЯ ШКОЛА АКАДЕМИКА Ф. А. КУЗНЕЦОВА

The paper presents a wide range of problems associated with the formation, development and practical implementation of research in materials science, carried out under direct leadership of Academician F. A. Kuznetsov by the team of researchers from the Nikolaev Institute of Inorganic Chemistry SB RAS. It shows the fruitfulness of his ideas of complex physicochemical research into each stage of the preparation of material from the precursor to the finished specific device element. Attention is drawn to his accurate prediction of the importance of selectable objects of study, his ability to correlate ongoing research with urgent global issues such as electronics, computer science, energy and photovoltaics and his skill to rally the team with a common idea and encourage active participation in the development of science both in Russia and internationally while remaining the main driving force of conducted advanced work. The paper is written in the memory of the eminent person, organizer of science, scientist and patriot whose work has always been focused on breakthrough technologies that ensure the prosperity and security of the Motherland.Рассмотрен широкий круг проблем, связанных со становлением, развитием и практической реализацией научных исследований в области материаловедения, выполненных коллективом сотрудников Института неорганической химии им. А. В. Николаева СО РАН под руководством академика Ф. А. Кузнецова. Показана плодотворность его идеи комплексного физико-химического изучения каждой стадии приготовления материала: от предшественника к готовому элементу конкретного устройства. Отмечено его безошибочное предвидение значимости выбираемых объектов исследования, его умение связывать проводимые исследования с такими насущными и глобальными проблемами, как электроника, информатика, энергетика, фотовольтаика, а также его способность сплачивать коллектив общей идеей и активное участие в развитии как российской, так и международной науки, оставаясь при этом локомотивом проводимых передовых работ. Статья написана в память о человеке, организаторе науки, ученом и патриоте, чья деятельность всегда была нацелена на прорывные технологии, обеспечивающие процветание и безопасность Родины

Protestant women in the late Soviet era: gender, authority, and dissent

At the peak of the anti-religious campaigns under Nikita Khrushchev, communist propaganda depicted women believers as either naïve dupes, tricked by the clergy, or as depraved fanatics; the Protestant “sektantka” (female sectarian) was a particularly prominent folk-devil. In fact, as this article shows, women’s position within Protestant communities was far more complex than either of these mythical figures would have one believe. The authors explore four important, but contested, female roles: women as leaders of worship, particularly in remote congregations where female believers vastly outnumbered their male counterparts; women as unofficial prophetesses, primarily within Pentecostal groups; women as mothers, replenishing congregations through high birth rates and commitment to their children’s religious upbringing; and women as political actors in the defence of religious rights. Using a wide range of sources, which include reports written by state officials, articles in the church journal, letters from church members to their ecclesiastical leaders in Moscow, samizdat texts, and oral history accounts, the authors probe women’s relationship with authority, in terms of both the authority of the (male) ministry within the church, and the authority of the Soviet state