Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki最新文献

Ultrasound-Assisted Extraction of Phenolic Compounds from Polyscias fruticosa (L.) Harms Root 超声辅助提取茯苓中酚类化合物的研究危害根

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Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki Pub Date : 2023-01-01 DOI: 10.26907/2542-064x.2023.1.58-67

L. Quoc, H. Anh

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Assessment of the Effect of Mineral Acids and Aluminum on the Intensity of Spectral Lines of Rare Earth Elements in Atomic Emission Spectroscopy of Microwave-Induced Plasma 无机酸和铝对微波等离子体原子发射光谱中稀土元素谱线强度影响的评价

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Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki Pub Date : 2023-01-01 DOI: 10.26907/2542-064x.2023.1.68-82

A.R. Chibirev, E.K. Konkova, A. Garifzyanov

{"title":"Assessment of the Effect of Mineral Acids and Aluminum on the Intensity of Spectral Lines of Rare Earth Elements in Atomic Emission Spectroscopy of Microwave-Induced Plasma","authors":"A.R. Chibirev, E.K. Konkova, A. Garifzyanov","doi":"10.26907/2542-064x.2023.1.68-82","DOIUrl":"https://doi.org/10.26907/2542-064x.2023.1.68-82","url":null,"abstract":"To obtain reliable results in the quantitative determination of rare earth elements (REE) by atomic emission spectroscopy, it is particularly important to take into account the matrix effects of the macrocomponents contained in the analyzed solutions. Analytes obtained by liquid-phase and autoclave opening of geological samples of REE ores and minerals contain significant amounts of strong mineral acids used as reagents and such macrocomponents of the samples as aluminum (aluminosilicates) and phosphorus (phosphates in apatites). Here, we studied the effects of hydrochloric, nitric, sulfuric, and orthophosphoric acids and aluminum on the relative intensity of the ion analytical lines of La, Ce, Nd, Sm, Gd, Tb, Er, and Yb in atomic emission spectroscopy of the microwave-induced plasma (AES MIP). With an increase in the acid concentration from 0 to 1 mol/L, the relative intensity of the spectral lines of all investigated REE decreased monotonically by 10–20%. The depressing effect of aluminum, which is due to a decrease in the degree of ionization of REE atoms, was much stronger and reached 70%. It was shown that the AES MIP method is not inferior to atomic emission spectroscopy of inductively coupled argon plasma in terms of the detection limits of lanthanum, cerium, gadolinium, and erbium.","PeriodicalId":23418,"journal":{"name":"Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76787640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Surface Microtextures of Quartz Grains and Origin of the Paleogene Sands in the Ulyanovsk-Syzran Volga Region 乌里扬诺夫斯克-叙兹兰伏尔加河地区古近系砂岩表面显微结构与成因

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Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki Pub Date : 2023-01-01 DOI: 10.26907/2542-064x.2023.2.295-307

S. Zorina, K. I. Nikashin, N. Afanasieva, N. Hamada

{"title":"Surface Microtextures of Quartz Grains and Origin of the Paleogene Sands in the Ulyanovsk-Syzran Volga Region","authors":"S. Zorina, K. I. Nikashin, N. Afanasieva, N. Hamada","doi":"10.26907/2542-064x.2023.2.295-307","DOIUrl":"https://doi.org/10.26907/2542-064x.2023.2.295-307","url":null,"abstract":"Quartz grains were separated by standard sieving of the Paleogene sands from the Sosnovka Formation of the Ulyanovsk-Syzran Volga region, which are a scarce and valuable raw material for glass making and construction. In order to establish the origin of the sands and restore the facies conditions of their formation, the surface microtextures of the separated quartz grains were examined by optical and electron microscopy. It was shown that the clastic grains of the Sosnovka sands bear the signs of a multi-stage formation process under the conditions of subaquatic (beach zone), eolian, mixed subaquatic-eolian (coastal dunes), injective, and continental pedological settings. For the first time, a complex of microtextures characteristic of the extrusion of grains from deep horizons under pressure and inherent in the injection mechanism of sand formation was described. The diagnostic complex of injectites includes rotational microtextures, notched microtroughs, and deformed fluid inclusions. The rather fresh appearance of the listed microtextures suggests that they were superimposed on the coastal-marine and eolian stages of the evolution with the subsequent formation of sand intrusions. At the final stage of the geological history of the Sosnovka sands, the grains were shaped by the continental pedological conditions, when secondary silica in the form of globules and their clusters cemented the quartz grains, the surface of which concatenated the features of the previous stages. Based on the results of the study, an interpretation scheme summarizing various microtextural features of the reconstructed paleoenvironments and the stages of formation the Sosnovka sands was developed. The finding that the Sosnovka sands are sand intrusions is of great practical importance, as it necessitates new approaches to the discovery and prediction of glass and quartz sand deposits confined to the Paleogene Sosnovka Formation of the Ulyanovsk-Syzran Volga region.","PeriodicalId":23418,"journal":{"name":"Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75149138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Spectrophotometric Determination of Nitroxoline in Medicines Using the Response Surface Methodology 响应面法分光光度法测定药物中的硝基喹啉

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Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki Pub Date : 2023-01-01 DOI: 10.26907/2542-064x.2023.1.118-132

R. Bakeeva, S. Garmonov, V.D. Osipova, K.V. Chernyj, S.Yu. Mamykina, V. Sopin

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Antifibrotic Effect of Pyrimidine Derivatives of Xymedon and Its Conjugate with L-Ascorbic Acid Xymedon嘧啶衍生物及其与l -抗坏血酸缀合物的抗纤维化作用

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Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki Pub Date : 2023-01-01 DOI: 10.26907/2542-064x.2023.2.175-189

G. Belyaev, A. Vyshtakalyuk, A. Parfenov, I. Galyametdinova, V. Semenov, V. Zobov

{"title":"Antifibrotic Effect of Pyrimidine Derivatives of Xymedon and Its Conjugate with L-Ascorbic Acid","authors":"G. Belyaev, A. Vyshtakalyuk, A. Parfenov, I. Galyametdinova, V. Semenov, V. Zobov","doi":"10.26907/2542-064x.2023.2.175-189","DOIUrl":"https://doi.org/10.26907/2542-064x.2023.2.175-189","url":null,"abstract":"This article considers the antifibrotic properties of pyrimidine derivatives of the drug Xymedon (compound (I)) and its conjugate with L-ascorbic acid (compound (II)) in an experimental rat model of fibrosis with a preventive administration scheme. Experimental fibrosis was induced in Wistar rats given carbon tetrachloride (5% oil solution, 0.2 mL/kg orally twice a week) in combination with ethanol (5% solution in drinking water, free access) against compounds (I) and (II), both administered preventively. Fibrotic changes in the liver were detected by Van Gieson’s staining. The effects of the studied compounds on the liver and clinical condition of rats were evaluated through serum biochemical parameters. The treatment of rats with compounds (I) and (II) reduced the number of fibrotic areas threefold, ameliorated hepatic steatosis and necrosis as compared to the control group, and improved blood biochemical parameters (ALT, AST, and LDH). Interestingly, compound (II) had a more pronounced effect. Therefore, pyrimidine derivatives of Xymedon and its conjugate with L-ascorbic acid showed an antifibrotic effect in our experimental rat model of fibrosis.","PeriodicalId":23418,"journal":{"name":"Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79848297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Magnetic and Structural Properties of Iron Oxide Nanoparticles Produced by Thermal Decomposition of Precursors in Solution 溶液中前驱体热分解制备氧化铁纳米颗粒的磁性和结构性质

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Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki Pub Date : 2023-01-01 DOI: 10.26907/2542-064x.2023.1.5-22

R. Amirov, A. Solodov, R. M. Gataullina, J. R. Shaiymova, E. A. Burilova, A. Kiiamov, Y. Tyan, R. Batulin, M. Cherosov, D. Tayurskii

引用次数: 0

Self-Assembly of the Dipeptide L-Alanyl-L-Phenylalanine under the Action of Methanol Vapor with the Formation of Micro- and Nanostructures 二肽l-丙烯酰- l-苯丙氨酸在甲醇蒸气作用下的自组装及其微纳米结构的形成

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Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki Pub Date : 2023-01-01 DOI: 10.26907/2542-064x.2023.1.37-48

A. S. Morozova, E. O. Kudryavtseva, S. Ziganshina, M. Ziganshin, A. Bukharaev

{"title":"Self-Assembly of the Dipeptide L-Alanyl-L-Phenylalanine under the Action of Methanol Vapor with the Formation of Micro- and Nanostructures","authors":"A. S. Morozova, E. O. Kudryavtseva, S. Ziganshina, M. Ziganshin, A. Bukharaev","doi":"10.26907/2542-064x.2023.1.37-48","DOIUrl":"https://doi.org/10.26907/2542-064x.2023.1.37-48","url":null,"abstract":"The mechanism of self-assembly by short-chain peptides (oligopeptides) – the process by which their molecules spontaneously form an ordered structure – has received much attention recently. Self-assembling phenylalanine oligopeptides have been of particular interest due to their potential as an effective aid in the design of new functional materials. This paper considers the results of an SPM study on the ability of L-alanyl-L-phenylalanine to self-assemble into a thin film under the action of methanol vapor. The micro- and nanostructures that develop on the surface of amorphous films of this dipeptide were characterized. A method for monitoring the state of the surface of dipeptide films using atomic force spectroscopy was proposed. The results obtained contribute to the development of approaches for the controlled self-assembly of oligopeptides used to produce new biocompatible materials and environmentally friendly micro- and nanodevices that would help solve various problems in the medical, environmental, and energy fields.","PeriodicalId":23418,"journal":{"name":"Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78820690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

α-Carboxylate Phosphabetains in Alkylation and Complexation Reactions α-羧酸磷脂在烷基化和络合反应中的应用

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Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki Pub Date : 2023-01-01 DOI: 10.26907/2542-064x.2023.1.158-169

Спектр Ямр, Спектр Яmp

引用次数: 1

Immunophenotype of Replicative Senescent Mesenchymal Stromal Cells 增殖性衰老间充质间质细胞的免疫表型

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Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki Pub Date : 2023-01-01 DOI: 10.26907/2542-064x.2023.2.216-230

A. Ratushnyy

{"title":"Immunophenotype of Replicative Senescent Mesenchymal Stromal Cells","authors":"A. Ratushnyy","doi":"10.26907/2542-064x.2023.2.216-230","DOIUrl":"https://doi.org/10.26907/2542-064x.2023.2.216-230","url":null,"abstract":"Mesenchymal stromal cells (MSCs), a population of progenitor cells in adult tissues, are involved in the processes of physiological tissue renewal and damage-induced regeneration. MSCs have been widely studied as regenerative medicine agents. In this regard, the tissue-specific features of MSC subpopulations should be taken into account. MSCs have many potentially beneficial properties that can alter significantly with age. The ability of a cell to respond to external signals and regulate its functional state is commonly attributed to the repertoire of receptors on the cell membrane. This article considers the surface marker expression of senescent adipose-derived MSCs (AD-MSCs). Replicative senescence was caused by long-term cultivation. An increase in the expression of CD29, CD44, CD54, CD73, CD90, and HLA-ABC on the AD-MSCs was shown. The expression of CD105 and CD51/61 did not change reliably under the experimental conditions. The revealed effects are related not only to the larger cell size or higher autofluorescence, but also to the increased number of markers per unit area of the cell surface. The detected changes may underlie a number of modifications in the properties of senescent MSCs, including migration, adhesion, and immunomodulatory and angiogenic activities.","PeriodicalId":23418,"journal":{"name":"Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76080135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Polyaromatic Hydrocarbons in the Bottom Sediments of the Caspian Sea 里海底部沉积物中的多芳烃

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Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki Pub Date : 2023-01-01 DOI: 10.26907/2542-064x.2023.2.263-280

D. Svetasheva, V. O. Tatarnikov, M. Ocheretny, O.I. Bakun

{"title":"Polyaromatic Hydrocarbons in the Bottom Sediments of the Caspian Sea","authors":"D. Svetasheva, V. O. Tatarnikov, M. Ocheretny, O.I. Bakun","doi":"10.26907/2542-064x.2023.2.263-280","DOIUrl":"https://doi.org/10.26907/2542-064x.2023.2.263-280","url":null,"abstract":"In this study, variations in the levels of oil hydrocarbons and polycyclic aromatic hydrocarbons (PAHs), which are persistent organic pollutants generated by human activities, were assessed in the bottom sediments of the Caspian Sea (Russia) sampled from 2012 to 2021. The samples were analyzed for their chemical composition. The concentrations of the identified compounds responsible for hydrocarbon pollution were established. The quantitative results of the industrial environmental monitoring in the Russian sector of the Caspian Sea for subsoil use were also reviewed and processed by standard statistical methods. It was revealed that ΣPAH concentrations in the Northern and Middle Caspian Sea regions vary from analytical zero to 186.7 μg/kg and from zero to 467.8 μg/kg, respectively. The scale of oil pollution in these two regions was found to be determined by the following PAHs: phenanthrene, acenaphthene, and naphthalene. The origin of the listed PAHs provides vital information on the main sources of pollution of the Caspian Sea bottom sediments with hazardous organic substances. Based on the obtained data, the areas with background PAH pollution of the bottom sediments and those with the characteristic PAH of mainly natural and pyrogenic origin were located.","PeriodicalId":23418,"journal":{"name":"Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90699077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0