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Glycinate Complexes and Models of Their Formation 甘氨酸配合物及其形成模型
IF 0.5
Moscow University Chemistry Bulletin Pub Date : 2026-04-15 DOI: 10.3103/S0027131426700070
Bobonazarzoda Gulrukhsor Bobonazar
{"title":"Glycinate Complexes and Models of Their Formation","authors":"Bobonazarzoda Gulrukhsor Bobonazar","doi":"10.3103/S0027131426700070","DOIUrl":"10.3103/S0027131426700070","url":null,"abstract":"<p>The complex formation in a Fe(II)–Fe(III)–Gly–Na(H)ClO<sub>4</sub>–H<sub>2</sub>O system is studied by the method of Clark–Nikolsky oxidation potential at 308.15 K, <i>I</i> = 0.50, <i>C</i><sub>Fe(II)</sub> = <i>C</i><sub>Fe(III)</sub> = 1 × 10<sup>–3</sup>, and <i>C</i><sub>Gly</sub> = 2 × 10<sup>–3</sup> mol/L in a range of pH of 0.5–8.5. The experimental curves of the dependence of the EMF of the system on the concentration parameters such as pH, p<i>C</i><sub>Fe(III)</sub>, p<i>C</i><sub>Fe(II)</sub>, and p<i>C</i><sub>L</sub> are obtained. A method of successive approximations of theoretical and experimental oxidative functions is used for the calculation of the formation constants of the complexes with the use of the Excel program.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"81 2","pages":"107 - 110"},"PeriodicalIF":0.5,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147667779","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
Influence of the Composition of CexZr1–xO2 Hydrosols on Their Rheological Properties cezr1 - xo2水溶胶组成对其流变性能的影响
IF 0.5
Moscow University Chemistry Bulletin Pub Date : 2026-04-15 DOI: 10.3103/S0027131426700045
I. V. Ivanov, N. N. Gavrilova, V. V. Nazarov
{"title":"Influence of the Composition of CexZr1–xO2 Hydrosols on Their Rheological Properties","authors":"I. V. Ivanov,&nbsp;N. N. Gavrilova,&nbsp;V. V. Nazarov","doi":"10.3103/S0027131426700045","DOIUrl":"10.3103/S0027131426700045","url":null,"abstract":"<p>Ce<sub><i>x</i></sub>Zr<sub>1–<i>x</i></sub>O<sub>2</sub> hydrosols with different particle compositions (<i>x</i> = 0.8, 0.5, 0.2) were synthesized, and flow curves were measured over a wide range of dispersed‑phase concentrations and dispersion‑medium pH values. It was found that, under the conditions studied, the Ce<sub><i>x</i></sub>Zr<sub>1–<i>x</i></sub>O<sub>2</sub> hydrosols behave as Newtonian fluids. At the same time, the Einstein equation is obeyed only within a rather narrow range of dispersed‑phase concentrations. Based on the particle density data and their effective volume fraction, the influence of surface layers on the viscosity increase of the hydrosols was evaluated. The effects of both primary and secondary electroviscosity were identified, and their contributions to the measured viscosity of the hydrosols were shown to depend on the dispersed‑phase concentration, the pH of the dispersion medium, and the particle composition.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"81 2","pages":"85 - 91"},"PeriodicalIF":0.5,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147667784","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
Carbonylcyanide-2-nitro-4-azidophenylhydrazone (an Azido Derivative of the Mitochondrial Uncoupler CCCP) as a Photosensitive Protonophore 羰基氰化物-2-硝基-4-叠氮苯腙（线粒体解偶联剂CCCP的叠氮衍生物）作为光敏质子载体
IF 0.5
Moscow University Chemistry Bulletin Pub Date : 2026-04-15 DOI: 10.3103/S0027131426700057
I. R. Iaubasarova, A. M. Firsov, L. S. Khailova, N. K. Davydova, E. A. Kotova, G. A. Korshunova, Y. N. Antonenko
{"title":"Carbonylcyanide-2-nitro-4-azidophenylhydrazone (an Azido Derivative of the Mitochondrial Uncoupler CCCP) as a Photosensitive Protonophore","authors":"I. R. Iaubasarova,&nbsp;A. M. Firsov,&nbsp;L. S. Khailova,&nbsp;N. K. Davydova,&nbsp;E. A. Kotova,&nbsp;G. A. Korshunova,&nbsp;Y. N. Antonenko","doi":"10.3103/S0027131426700057","DOIUrl":"10.3103/S0027131426700057","url":null,"abstract":"<p>An azido derivative of the mitochondrial uncoupler carbonyl cyanide-<i>m</i>-chlorophenylhydrazone (CCCP), namely carbonyl cyanide-2-nitro-4-azidophenyl hydrazone (N<sub>3</sub> CCP), has previously been used to study the binding sites of uncouplers on mitochondrial proteins. In this study, we compared the protonophoric activity of N<sub>3</sub> CCP and CCCP on an artificial bilayer lipid membrane (BLM) and the uncoupling activity of these compounds in isolated rat liver mitochondria. Both compounds induced electrical current through the BLM at micromolar concentrations and uncoupled mitochondria at submicromolar concentrations. Both protonophoric and uncoupling activities of N<sub>3</sub> CCP were effectively inhibited by UV light, whereas CCCP was light-insensitive. These results indicate that N<sub>3</sub> CCP is modified by UV light to form products incapable of hydrogen ion transport across artificial or natural membranes.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"81 2","pages":"92 - 97"},"PeriodicalIF":0.5,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147667785","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
Study of the Effectiveness of Using Industrial Porous Polymer Films, Foams, and Fiber Materials as Sorbents for Petroleum Products 工业多孔聚合物薄膜、泡沫和纤维材料作为石油产品吸附剂的有效性研究
IF 0.5
Moscow University Chemistry Bulletin Pub Date : 2026-04-15 DOI: 10.3103/S0027131426700021
A. Yu. Yarysheva, A. A. Dolgova, L. M. Yarysheva, A. A. Yaroslavov
{"title":"Study of the Effectiveness of Using Industrial Porous Polymer Films, Foams, and Fiber Materials as Sorbents for Petroleum Products","authors":"A. Yu. Yarysheva,&nbsp;A. A. Dolgova,&nbsp;L. M. Yarysheva,&nbsp;A. A. Yaroslavov","doi":"10.3103/S0027131426700021","DOIUrl":"10.3103/S0027131426700021","url":null,"abstract":"<p>A comparative analysis of the structure and sorption properties of nano- and microporous materials based on large-capacity industrial polymers in the form of films, fibers, nonwoven and foam materials, including those manufactured as packaging materials, geotextiles, and medical devices, was carried out. It has been shown that the sorption capacity, sorption kinetics and buoyancy of the studied materials are determined by the geometric size and shape of the sorbent, the size and volume of the pores. The most effective were foam materials (polyurethane foam, polyethylene foam), which retain buoyancy at high sorption capacity (17–39 g/g). The possibility of using porous polymer materials as carriers of bacteria-biodegraders of oil and oil products has been demonstrated.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"81 2","pages":"69 - 75"},"PeriodicalIF":0.5,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147667786","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
Synthesis of Diethyl 2-(4-Nitrobenzylidene) Malonate and Its Application as Derivatization Reagent in HPLC Detection of 2-Methylmercaptoacetate 2-（4-硝基苄基）丙二酸二乙酯的合成及其衍生试剂在2-甲基巯基乙酸酯HPLC检测中的应用
IF 0.5
Moscow University Chemistry Bulletin Pub Date : 2026-04-15 DOI: 10.3103/S002713142670001X
D. A. Karpeev, A. V. Pirogov
{"title":"Synthesis of Diethyl 2-(4-Nitrobenzylidene) Malonate and Its Application as Derivatization Reagent in HPLC Detection of 2-Methylmercaptoacetate","authors":"D. A. Karpeev,&nbsp;A. V. Pirogov","doi":"10.3103/S002713142670001X","DOIUrl":"10.3103/S002713142670001X","url":null,"abstract":"<p>The key requirements are outlined for an effective pre-column derivatization reagent used in the HPLC determination of chromophore-free organic compounds. Nitrofluorostyrenes, dichlorostyrenes, and diethyl 2-(4-nitrobenzylidene) malonate were studied as new reagents. Diethyl 2-(4-nitrobenzylidene) malonate was selected as the optimal reagent. 2-Methylmercaptoacetate was derivatized as a test analyte under mild conditions for 20 min at room temperature. The reaction proceeded to completion, forming a single product. The detection limit of 2-methylmercaptoacetate decreased by a factor of 67 (to 15 ng mL<sup>–1</sup>) compared to the initial value.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"81 2","pages":"63 - 68"},"PeriodicalIF":0.5,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147667781","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
Equation Relating Component Concentrations in Electrolyte Solutions: Solving for Hydrogen Ion Concentration and Titration Curves 电解质溶液中有关成分浓度的方程：氢离子浓度和滴定曲线的求解
IF 0.5
Moscow University Chemistry Bulletin Pub Date : 2026-04-15 DOI: 10.3103/S0027131426700069
S. V. Yefimov
{"title":"Equation Relating Component Concentrations in Electrolyte Solutions: Solving for Hydrogen Ion Concentration and Titration Curves","authors":"S. V. Yefimov","doi":"10.3103/S0027131426700069","DOIUrl":"10.3103/S0027131426700069","url":null,"abstract":"<p>This paper examines the equilibrium state of an electrolyte solution containing an acid and a base in arbitrary ratios. An equation relating the concentrations of the solution components (connection equation) is derived. A method for solving this equation with respect to the hydrogen ion concentration is proposed. The theoretical predictions are compared with experimental titration curves.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"81 2","pages":"98 - 106"},"PeriodicalIF":0.5,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147667783","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
Viscosity of Concentrated Water-in-Oil Emulsions within the Framework of the Structural Model 在结构模型框架内的浓油包水乳状液粘度
IF 0.5
Moscow University Chemistry Bulletin Pub Date : 2026-04-15 DOI: 10.3103/S0027131426700033
V. N. Matveenko, E. A. Kirsanov
{"title":"Viscosity of Concentrated Water-in-Oil Emulsions within the Framework of the Structural Model","authors":"V. N. Matveenko,&nbsp;E. A. Kirsanov","doi":"10.3103/S0027131426700033","DOIUrl":"10.3103/S0027131426700033","url":null,"abstract":"<p>A structural rheological model is used to interpret the viscosity curves and flow curves of concentrated emulsions consisting of water droplets in oil. It is shown that the rheological curves can be divided into separate intervals of shear rates, within which the experimental data are approximated by the rheological equations of the structural model. The generalized flow equation describes the breakdown of the emulsion structure under the action of tensile hydrodynamic forces. The second rheological equation additionally includes a rate constant related to the process of droplet aggregate formation under the action of compressive hydrodynamic forces. The dependence of the generalized flow equation coefficients <span>(eta _{{text{c}}}^{{1/2}})</span> and <span>(tau _{{text{c}}}^{{1/2}})</span> on the volume fraction Φ is described by separate equations which utilize hydrodynamic parameters. The compactness coefficient χ, associated with the spontaneous rupture of droplets, changes in a complex manner with increasing concentration, which may be related to the formation of aggregates and the change in droplet shape due to deformation upon droplet contact.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"81 2","pages":"76 - 84"},"PeriodicalIF":0.5,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147667782","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
Immunofluorescence Assay of De Novo Vimentin Expression in Serous Ovarian Cancer Cells as a Potential Predictor of the Efficacy of Platinum-Based Drugs and Taxanes 免疫荧光法检测浆液性卵巢癌细胞De Novo Vimentin表达作为铂类药物和紫杉烷类药物疗效的潜在预测因子
IF 0.5
Moscow University Chemistry Bulletin Pub Date : 2026-04-03 DOI: 10.3103/S0027131425700476
T. A. Bogush, A. N. Grishanina, E. A. Bogush, A. M. Scherbakov, E. A. Ogurechnikova, A. B. Ravcheeva, E. M. Kapura-Brekhovskikh, M. Ya. Melnikov
{"title":"Immunofluorescence Assay of De Novo Vimentin Expression in Serous Ovarian Cancer Cells as a Potential Predictor of the Efficacy of Platinum-Based Drugs and Taxanes","authors":"T. A. Bogush,&nbsp;A. N. Grishanina,&nbsp;E. A. Bogush,&nbsp;A. M. Scherbakov,&nbsp;E. A. Ogurechnikova,&nbsp;A. B. Ravcheeva,&nbsp;E. M. Kapura-Brekhovskikh,&nbsp;M. Ya. Melnikov","doi":"10.3103/S0027131425700476","DOIUrl":"10.3103/S0027131425700476","url":null,"abstract":"<p>De novo expression of the mesenchymal protein vimentin in the cells expressing epithelial cytokeratins was quantified by double immunofluorescence staining of serous ovarian cancer samples (<i>n</i> = 56). The median value was shown to be 1.6 times higher (<i>p</i> = 0.006) in the group of resistant tumors compared with that of sensitive tumors (disease relapse after chemotherapy with platinum drugs and taxanes for ≤6 months and ≥12 months). Conclusions. The level of de novo vimentin expression is a predictor of the efficacy of platinum drugs and taxanes with the calculated specificity and sensitivity of the assay of more than 80% and the cutoff value of 42.5% for sensitive and resistant tumors.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"81 1","pages":"31 - 36"},"PeriodicalIF":0.5,"publicationDate":"2026-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147588452","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
Possibilities for Forming Nanofibers from Bombyx mori Chitosan 家蚕壳聚糖制备纳米纤维的可能性
IF 0.5
Moscow University Chemistry Bulletin Pub Date : 2026-04-03 DOI: 10.3103/S0027131425700518
K. K. Pirniyazov, R. Yu. Milusheva, N. Sh. Ashurov, S. Sh. Rashidova
{"title":"Possibilities for Forming Nanofibers from Bombyx mori Chitosan","authors":"K. K. Pirniyazov,&nbsp;R. Yu. Milusheva,&nbsp;N. Sh. Ashurov,&nbsp;S. Sh. Rashidova","doi":"10.3103/S0027131425700518","DOIUrl":"10.3103/S0027131425700518","url":null,"abstract":"<p>This paper describes the possibility of forming nanofibers from <i>Bombyx mori</i> chitosan and high-molecular-weight crab chitosan (HMWCh) by electrospinning. The structural characteristics of nanostructured <i>Bombyx mori</i> chitosan and crab chitosan are studied by XRD and IR spectroscopy. The possibilities of forming nanofibers and nanoparticles in a solvent are evaluated.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"81 1","pages":"58 - 62"},"PeriodicalIF":0.5,"publicationDate":"2026-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147588437","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
Application of Neural Networks for Investigating Potential Energy Surfaces of Electronically Excited States and Internal Conversion Mechanisms of Organic Molecules 神经网络在有机分子电子激发态势能面及内部转化机制研究中的应用
IF 0.5
Moscow University Chemistry Bulletin Pub Date : 2026-04-03 DOI: 10.3103/S0027131425700488
D. N. Chistikov, V. E. Bochenkov, D. A. Firsov, V. V. Korolev, A. V. Bochenkova
{"title":"Application of Neural Networks for Investigating Potential Energy Surfaces of Electronically Excited States and Internal Conversion Mechanisms of Organic Molecules","authors":"D. N. Chistikov,&nbsp;V. E. Bochenkov,&nbsp;D. A. Firsov,&nbsp;V. V. Korolev,&nbsp;A. V. Bochenkova","doi":"10.3103/S0027131425700488","DOIUrl":"10.3103/S0027131425700488","url":null,"abstract":"<p>Based on non-empirical data obtained using a high-level multi-configurational quantum chemistry method, neural networks with the architectures of a multilayer perceptron and an E(3)-equivariant graph network were constructed and trained to predict the energies of the ground and the first two electronically excited states of the methaniminium cation, <span>({text{C}}{{{text{H}}}_{2}}{text{NH}}_{2}^{ + })</span>. It is shown that the E(3)-equivariant graph neural network architecture demonstrates higher accuracy. Using the trained network, a segment of the cation’s potential energy surfaces near the region of the conical intersection between the first excited and the ground states was investigated; this region plays an important role in the mechanism of internal conversion and photoisomerization reactions. It is demonstrated that the neural network accurately reproduces the topography of the potential energy surfaces of the two electronic states in the region of their conical intersection.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"81 1","pages":"37 - 45"},"PeriodicalIF":0.5,"publicationDate":"2026-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147588454","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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