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Interaction of Copper Clusters with Dioxidine 铜簇与二氧六环的相互作用
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2024-10-16 DOI: 10.3103/S0027131424700226
A. Yu. Ermilov, A. V. Soloviev, Yu. N. Morosov, T. I. Shabatina
{"title":"Interaction of Copper Clusters with Dioxidine","authors":"A. Yu. Ermilov,&nbsp;A. V. Soloviev,&nbsp;Yu. N. Morosov,&nbsp;T. I. Shabatina","doi":"10.3103/S0027131424700226","DOIUrl":"10.3103/S0027131424700226","url":null,"abstract":"<p>The configurations of small copper clusters (Cu<sub>2</sub>, Cu<sub>3</sub>, Cu<sub>13</sub>) and their complexes including a complex containing a copper atom with dioxidine (Dx) are calculated by density functional theory modeling with B3LYP5 parametrization. The trends of the changes in the geometry configuration and metal cluster–dioxidine ligand interaction energy depending on the size of the metal cluster are assessed. The dissociation energy of the complexes increases with the metal cluster size but the maximum value (55.1 kcal/mol) is implemented for a Cu<sub>3</sub>–Dx complex. There is coordination of the metal atom to one or two oxygen atoms of the dioxidine molecule for all the complexes.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"79 4","pages":"233 - 238"},"PeriodicalIF":0.7,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443180","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
Modification of the Process of Cesium Separation from the Product of the High-Temperature Treatment of Spent Fuel with Molybdenum Trioxide 改进用三氧化钼高温处理乏燃料产品的铯分离工艺
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2024-10-16 DOI: 10.3103/S0027131424700378
V. A. Boldakov, S. S. Poglyad, A. S. Kornilov, O. S. Dmitrieva, V. N. Momotov, N. O. Pozigun, A. A. Telnova
{"title":"Modification of the Process of Cesium Separation from the Product of the High-Temperature Treatment of Spent Fuel with Molybdenum Trioxide","authors":"V. A. Boldakov,&nbsp;S. S. Poglyad,&nbsp;A. S. Kornilov,&nbsp;O. S. Dmitrieva,&nbsp;V. N. Momotov,&nbsp;N. O. Pozigun,&nbsp;A. A. Telnova","doi":"10.3103/S0027131424700378","DOIUrl":"10.3103/S0027131424700378","url":null,"abstract":"<p>The technological scheme of cesium extraction from spent fuel before hydrometallurgical reprocessing is developing in order to reduce the heat dissipation and specific activity of spent fuel. The scheme includes the joint high temperature treatment of spent fuel and molybdenum trioxide, flushing the product with an alkali solution to remove cesium, and then dissolving the fuel in nitric acid. Implementation of this technology will allow reducing the cooling time of the spent fuel and reduce the radiation impact on personnel, equipment, and technological environment. This article presents the results of the experimental substantiation of the choice of temperature of the high-temperature treatment, comparative analysis of the efficiency of flushing solutions of different compositions, and determining the duration of the cesium fractionation process. The research was conducted in laboratory conditions with the use of spent fuel imitators and radionuclide markers.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"79 5","pages":"338 - 344"},"PeriodicalIF":0.7,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443234","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
A Comparative Study of the Dynamic Behavior of Bacterial Photoregulated Adenylate Cyclases bPAC and OaPAC 细菌光调节腺苷酸环化酶 bPAC 和 OaPAC 的动态行为比较研究
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2024-10-16 DOI: 10.3103/S0027131424700251
M. S. Kuryshkina, A. M. Kulakova, A. A. Moskovsky, M. G. Khrenova
{"title":"A Comparative Study of the Dynamic Behavior of Bacterial Photoregulated Adenylate Cyclases bPAC and OaPAC","authors":"M. S. Kuryshkina,&nbsp;A. M. Kulakova,&nbsp;A. A. Moskovsky,&nbsp;M. G. Khrenova","doi":"10.3103/S0027131424700251","DOIUrl":"10.3103/S0027131424700251","url":null,"abstract":"<p>Photoregulated adenylate cyclases bPAC and OaPAC are compared using methods of classical molecular dynamics in the states before and after irradiation with light. The pathways of signal transduction from the photoreceptor domain to the catalytic domain are determined. The more pronounced acceleration of the catalytic reaction as a result of irradiation with light in the case of bPAC is determined both by a shift of the equilibrium towards a closed conformation and a more significant increase in the number of suboptimal pathways of allosteric signal transduction from one domain to another.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"79 4","pages":"257 - 261"},"PeriodicalIF":0.7,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443290","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
Non-Destructive Analysis of Tetracycline Drugs by the Digital Colormetric Method Using a Smartphone and the Photometrix Pro® Software 使用智能手机和 Photometrix Pro® 软件以数字比色法对四环素药物进行无损分析
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2024-10-16 DOI: 10.3103/S0027131424700354
V. G. Amelin, G. M. Beschastnova, Z. A. Ch. Shogah, A. V. Tretyakov, L. K. Kish
{"title":"Non-Destructive Analysis of Tetracycline Drugs by the Digital Colormetric Method Using a Smartphone and the Photometrix Pro® Software","authors":"V. G. Amelin,&nbsp;G. M. Beschastnova,&nbsp;Z. A. Ch. Shogah,&nbsp;A. V. Tretyakov,&nbsp;L. K. Kish","doi":"10.3103/S0027131424700354","DOIUrl":"10.3103/S0027131424700354","url":null,"abstract":"<p>A nondestructive analysis of tetracyclines in drugs by their own fluorescence using a smartphone and a device printed on a 3D printer is proposed. The possibility of using chemometric methods, which reduce the analysis time and visualize the obtained data, is shown. The dataset is processed by principal component analysis (PCA), hierarchical cluster analysis (HCA), partial least squares (PLS) regression, and least squares using the PhotoMetrix PRO<sup>®</sup> software. The use of chemometric methods of analysis to determine the concentration of the active substance and identify the manufacturer of medicinal products is considered.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"79 5","pages":"325 - 333"},"PeriodicalIF":0.7,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443182","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
Chemical Modification of Minerals Surfaces: Brief Sketch of Formation and Development 矿物表面的化学修饰：形成与发展简述
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2024-10-16 DOI: 10.3103/S0027131424700366
G. V. Lisichkin
{"title":"Chemical Modification of Minerals Surfaces: Brief Sketch of Formation and Development","authors":"G. V. Lisichkin","doi":"10.3103/S0027131424700366","DOIUrl":"10.3103/S0027131424700366","url":null,"abstract":"<p>This article succinctly outlines the key points of the emergence and development of methods for chemical modification of the surface of inorganic substrates. It is shown that the assumption of the presence of chemically active functional groups on such surfaces arose relatively recently, although the first experience of practical application was carried out in the middle of the 19th century. The main stages in the development of the chemistry of surface compounds are traced.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"79 5","pages":"334 - 337"},"PeriodicalIF":0.7,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443333","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
Huntingtin, the Major Factor in Huntington’s Disease Development. Main Functions and Intracellular Proteolysis 亨廷顿症发病的主要因素亨廷廷蛋白。主要功能和细胞内蛋白质分解
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2024-07-11 DOI: 10.3103/S0027131424700160
N. N. Gotmanova, A. V. Bacheva
{"title":"Huntingtin, the Major Factor in Huntington’s Disease Development. Main Functions and Intracellular Proteolysis","authors":"N. N. Gotmanova,&nbsp;A. V. Bacheva","doi":"10.3103/S0027131424700160","DOIUrl":"10.3103/S0027131424700160","url":null,"abstract":"<p>This review is devoted to the consideration of pathological intracellular mechanisms characteristic of Huntington’s disease and the central role of huntingtin protein in these processes. The features of mutant huntingtin aggregates utilization by the ubiquitin–proteasome system and autophagy, as well as the possibilities of polyglutamine-containing substrates hydrolysis by proteasome are discussed.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"79 3","pages":"189 - 194"},"PeriodicalIF":0.7,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141609442","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
Biopolymer Controlled Release Systems Based on Hydrolyzed Collagen: Cryoforming, Structure, and Properties 基于水解胶原蛋白的生物聚合物控释系统：冷冻成型、结构和特性
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2024-07-11 DOI: 10.3103/S0027131424700147
A. A. Makeeva, A. S. Shumilkin, A. S. Ryzhkova, O. I. Vernaya, A. V. Shabatin, A. M. Semenov, T. I. Shabatina
{"title":"Biopolymer Controlled Release Systems Based on Hydrolyzed Collagen: Cryoforming, Structure, and Properties","authors":"A. A. Makeeva,&nbsp;A. S. Shumilkin,&nbsp;A. S. Ryzhkova,&nbsp;O. I. Vernaya,&nbsp;A. V. Shabatin,&nbsp;A. M. Semenov,&nbsp;T. I. Shabatina","doi":"10.3103/S0027131424700147","DOIUrl":"10.3103/S0027131424700147","url":null,"abstract":"<p>Biopolymer materials based on natural collagen (gelatin, hydrolyzed collagen) are widely used in the food, pharmaceutical, and cosmetic industries due to their low toxicity, high biocompatibility, low antigenicity, and unique mechanical and technological properties. Hydrolyzed collagen, unlike gelatin, is formed by peptides with a lower molecular weight. Its advantages are higher bioavailability and biodegradability in comparison with gelatin. In this study, biopolymer matrices containing a dioxidine antibacterial drug are obtained based on hydrolyzed collagen using low-temperature technologies. It is shown that, varying synthesis parameters such as the concentration of hydrolyzed collagen in the precursor solution (from 1 to 10%), matrix crosslinking time (0.1–24 h), and cryoforming temperature (–30 and –196°C), it is possible to change the morphology and structure of the matrix, its degradation time, and drug release time. The composition and structure of dioxidine/hydrolyzed collagen systems are characterized by SEM and IR and UV spectroscopy. The antibacterial activity of the resulting dioxidine/hydrolyzed collagen systems against <i>E. coli</i> and <i>S. aureus</i> is characterized by the disk diffusion method.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"79 3","pages":"175 - 181"},"PeriodicalIF":0.7,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141609520","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
Photochemistry of Radical Cations of Some Organic Oxygen-Containing Compounds in Frozen Matrices 冷冻基质中某些有机含氧化合物的自由基阳离子的光化学作用
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2024-07-11 DOI: 10.3103/S0027131424700111
M. Ya. Melnikov, O. I. Gromov, V. I. Pergushov, D. A. Pomogailo, I. D. Sorokin
{"title":"Photochemistry of Radical Cations of Some Organic Oxygen-Containing Compounds in Frozen Matrices","authors":"M. Ya. Melnikov,&nbsp;O. I. Gromov,&nbsp;V. I. Pergushov,&nbsp;D. A. Pomogailo,&nbsp;I. D. Sorokin","doi":"10.3103/S0027131424700111","DOIUrl":"10.3103/S0027131424700111","url":null,"abstract":"<p>The review is dedicated to the photochemical reactions of radical cations (RC) of various organic oxygen-containing compounds stabilized in low-temperature matrices. The nature of RC and the products of their photochemical reactions has been established via quantum chemistry, electron paramagnetic resonance (EPR) and low-temperature optical spectroscopy. Depending on the structure of the precursor molecule, various mechanisms of photoconversion arise for these RC: charge transfer to matrix molecules, hydrogen atom and proton transfer, isomerization, dissociation. This study allowed us to posit that there is no correlation between the structure of the molecule of the precursor molecule and the variety of available phototransformation channels for the corresponding RC in frozen matrices.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"79 3","pages":"147 - 155"},"PeriodicalIF":0.7,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141614276","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
Coelenterazine-Dependent Luciferases: Properties and Application in Molecular Analysis 依赖于腔肠素的荧光素酶：特性及在分子分析中的应用
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2024-07-11 DOI: 10.3103/S0027131424700184
L. A. Frank, V. V. Krasitskaya
{"title":"Coelenterazine-Dependent Luciferases: Properties and Application in Molecular Analysis","authors":"L. A. Frank,&nbsp;V. V. Krasitskaya","doi":"10.3103/S0027131424700184","DOIUrl":"10.3103/S0027131424700184","url":null,"abstract":"<p>This review presents the data on the structure of bioluminescent systems of marine animals that use coelenterazine-dependent luciferases as light-emitting proteins. It is shown that these luciferases and their genetic variants with new useful properties are successfully used as reporter molecules in a variety of analytical systems in vitro and in vivo due to the availability, stability, and high quantum yield of the reactions. Their application ensures a high level of sensitivity, simple design, and fast analysis.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"79 3","pages":"203 - 210"},"PeriodicalIF":0.7,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141614283","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
Hydrodechlorination of Diclofenac in an Aqueous Solution over Pd/ZrO2 and Pd/ZrO2SiO2 Catalysts 水溶液中双氯芬酸在 Pd/ZrO2 和 Pd/ZrO2SiO2 催化剂上的加氢脱氯反应
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2024-07-11 DOI: 10.3103/S0027131424700123
V. V. Shishova, E. S. Lokteva, G. S. Maksimov, K. I. Maslakov, I. Yu. Kaplin, S. V. Maksimov, E. V. Golubina
{"title":"Hydrodechlorination of Diclofenac in an Aqueous Solution over Pd/ZrO2 and Pd/ZrO2SiO2 Catalysts","authors":"V. V. Shishova,&nbsp;E. S. Lokteva,&nbsp;G. S. Maksimov,&nbsp;K. I. Maslakov,&nbsp;I. Yu. Kaplin,&nbsp;S. V. Maksimov,&nbsp;E. V. Golubina","doi":"10.3103/S0027131424700123","DOIUrl":"10.3103/S0027131424700123","url":null,"abstract":"<div><p>Pd/ZrO<sub>2</sub> and Pd/ZrO<sub>2</sub>SiO<sub>2</sub> catalysts prepared by wet impregnation and reduced with H<sub>2</sub> under mild (30°C, aqueous suspension) or harsh (320°C) conditions are compared in the hydrodechlorination of the microecotoxicant diclofenac (DCF) in an aqueous solution at 30°С. According to the TPR and XPS data, the addition of SiO<sub>2</sub> to the support reduces the degree of metal-support interaction and facilitates the reduction of palladium. Despite the lower Pd<sup>0</sup> fraction, the Pd/ZrO<sub>2</sub> catalyst is more active in the batch reactor: after reduction at 320°С, it slightly, and after mild reduction, significantly (7 times), exceeds Pd/ZrO<sub>2</sub>SiO<sub>2</sub> in catalytic activity. XRD and TEM show a wider size distribution of palladium nanoparticles in the Pd/ZrO<sub>2</sub> sample, while low-temperature N<sub>2</sub> adsorption, XPS, and TPR demonstrated better accessibility of palladium on the Pd/ZrO<sub>2</sub> surface due to the reduced decoration by the support components and increased pore size. These features explain the increased activity of Pd/ZrO<sub>2</sub>. Testing in the flow system demonstrated higher DCF conversion in the presence of catalysts reduced at 320°C and higher stability of Pd/ZrO<sub>2</sub>SiO<sub>2</sub> compared to Pd/ZrO<sub>2</sub>. The stability is ensured by the increased reducibility of Pd<sup>2+</sup> with H<sub>2</sub> and by the developed surface of Pd/ZrO<sub>2</sub>SiO<sub>2</sub>, which prevents deactivation under the action of HCl released in hydrodechlorination.</p></div>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"79 3","pages":"156 - 169"},"PeriodicalIF":0.7,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141614279","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
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