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Spectrophotometric Determination of Copper(II) in Soil in the Form of a Pyrogallol Red Complex in the Presence of Surfactants 分光光度法测定存在表面活性剂的土壤中以焦耳酚红络合物形式存在的铜(II)
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2024-04-02 DOI: 10.3103/S0027131424010085
S. E. Pratskova, D. R. Khudaiberdina
{"title":"Spectrophotometric Determination of Copper(II) in Soil in the Form of a Pyrogallol Red Complex in the Presence of Surfactants","authors":"S. E. Pratskova,&nbsp;D. R. Khudaiberdina","doi":"10.3103/S0027131424010085","DOIUrl":"10.3103/S0027131424010085","url":null,"abstract":"<p>A spectrophotometric procedure for the quantitative determination of copper(II) by a reaction of complex formation with pyrogallol red in the presence of cationic and nonionic surfactants is proposed. The optimum conditions for the analysis are determined. The procedure is tested for the determination of copper(II) in a sample of a soil extract. The following metrological characteristics of the proposed procedure are assessed: the limit of detection is 0.12 mg/kg of soil and the relative standard deviation is &lt;0.05.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"79 1","pages":"50 - 53"},"PeriodicalIF":0.7,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140589286","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
The Influence of Polyvinyl Alcohol on the Stability of Aqueous Dispersions of Nanodiamonds 聚乙烯醇对纳米金刚石水分散体稳定性的影响
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2024-04-02 DOI: 10.3103/S0027131424010103
O. A. Soboleva
{"title":"The Influence of Polyvinyl Alcohol on the Stability of Aqueous Dispersions of Nanodiamonds","authors":"O. A. Soboleva","doi":"10.3103/S0027131424010103","DOIUrl":"10.3103/S0027131424010103","url":null,"abstract":"<p>The stability of aqueous dispersions of detonation nanodiamonds (NDs) in the presence of polyvinyl alcohol (PVA) is studied. It is found that PVA additives with a concentration above 0.1 wt % cause the formation of aggregates. To increase the stability of dispersions of NDs, it is proposed to add a stabilizer—an anionic surfactant sodium dodecyl sulfate (SDS)—into the system. As a result of the simultaneous stabilizing action of an SDS–PVA mixture, the aggregation stability of aqueous dispersions of NDs noticeably increases, while the particle size in the dispersions remains unchanged for several days.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"79 1","pages":"36 - 40"},"PeriodicalIF":0.7,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140589289","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
Lattice Tilings of a Plane into Polyominoes and Molecular Layers in Crystal Structures: Structural Class cm, Z = 2(m) 晶体结构中多面体和分子层的平面层叠：结构类 cm，Z = 2(m)
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2024-04-02 DOI: 10.3103/S0027131424010097
K. G. Seravkin, K. A. Potekhin, A. M. Banaru
{"title":"Lattice Tilings of a Plane into Polyominoes and Molecular Layers in Crystal Structures: Structural Class cm, Z = 2(m)","authors":"K. G. Seravkin,&nbsp;K. A. Potekhin,&nbsp;A. M. Banaru","doi":"10.3103/S0027131424010097","DOIUrl":"10.3103/S0027131424010097","url":null,"abstract":"<p>Lattice tilings of a plane into polyominoes are constructed for <i>N</i> from 3 to 12, where <i>N</i> is the order of the packing space. A total of 5191 symmetrically independent lattice tilings of the plane with one polyomino in a reduced (primitive) cell are obtained, among which 122 variants belong to the structural class (SC) <i>cm</i>, <i>Z</i> = 2(<i>m</i>), with a rectangular conventional (centered) unit cell. Chain tilings of the plane are derived, for which both the SC and structural subclass (SSC) are identified. The results of the analysis of the lattice tilings of a plane into polyominoes are illustrated with examples of real molecular layers in crystal structures.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"79 1","pages":"14 - 20"},"PeriodicalIF":0.7,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140576177","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
Rheology of Structured Liquids: Dependence of Dynamic Moduli on Strain Amplitude 结构液体流变学：动态模量与应变振幅的关系
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2024-04-02 DOI: 10.3103/S0027131424010061
V. N. Matveenko, E. A. Kirsanov
{"title":"Rheology of Structured Liquids: Dependence of Dynamic Moduli on Strain Amplitude","authors":"V. N. Matveenko,&nbsp;E. A. Kirsanov","doi":"10.3103/S0027131424010061","DOIUrl":"10.3103/S0027131424010061","url":null,"abstract":"<p>A new interpretation is proposed for the dependence of dynamic moduli on the strain amplitude in the course of shear vibrations at a fixed vibration frequency. The interpretation is based on a structural rheological model that includes kinetic equations for the formation and destruction of particles’ aggregates under the action of an oscillating shear flow. The rheological equations, which can be used for the approximation of rheological curves <i>G</i>'(γ<sub>0</sub>) and <i>G</i>''(γ<sub>0</sub>) in separate sections with different amplitudes of the shear strain, are obtained. The possibilities of the new rheological model are demonstrated through the example of two polymer systems with solid particle-based fillers.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"79 1","pages":"27 - 35"},"PeriodicalIF":0.7,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140589094","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
Evaluation of the Nutritional Value, Toxins and Pollutants in Mazandaran Rice and Detection of the Rice Health Level 评估马赞达兰大米的营养价值、毒素和污染物，检测大米的健康水平
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2024-04-02 DOI: 10.3103/S0027131424010024
Ahmad Gholizadeh,  Seyed Esmaeil Yazdanpanah
{"title":"Evaluation of the Nutritional Value, Toxins and Pollutants in Mazandaran Rice and Detection of the Rice Health Level","authors":"Ahmad Gholizadeh,&nbsp; Seyed Esmaeil Yazdanpanah","doi":"10.3103/S0027131424010024","DOIUrl":"10.3103/S0027131424010024","url":null,"abstract":"<p>As insecticides, fungicides, heavy metals, and aflatoxins enter the food chain, they cause adverse effects on living organisms and humans. Given that rice is a widely-consumed food in Iran, the present study aimed to investigate the probability of the existence of insecticides, fungicides, heavy metals, and aflatoxins, as well as the nutritional value of rice in Mazandaran province. To this end, four cultivars of rice, namely Tarom, Fajr, Neda, and Shiroodi rice were collected from farms in the region, and after preparation, the concentration of pollutants in rice was measured in different ways in the laboratory. SPSS 25 software was used to analyze data. Based on the findings, the average nutritional value of four cultivars of rice was high in terms of protein (8.575 ± 0.298 g), fiber (less than 1), fat (1.2 g), carbohydrates (81.725 ± 0.512 g), calcium (405.64 ± 0.81 ppm), and B vitamins, where the average of vitamin B1 was 2.775 ± 1.305 g, vitamin B2 was 3.5 ± 1.62 g, vitamin B3 and B6 were less than 0.2, and vitamin B12 was less than 5. Heavy metals (less than 0.1 ppm), arsenic (0.095 ± 0.338 ppm), and cadmium (less than 0.025 ppm) were lower than the standard level. Due to the proximity of heavy metals to the standard, its status was considered critical. The average concentrations of aflatoxins, insecticides, fungicides, and herbicides were standard in different cultivars of rice. Given the nutritional value, the standard level of pollutants, and the health of Iranian rice species, rice consumption is recommended in diets and exports.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"79 1","pages":"54 - 62"},"PeriodicalIF":0.7,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140589093","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 and Biological Evaluation Studies of Novel 1,3,4-Oxadiazole and Benzo[d]imidazole Scaffolds as Promising Antimicrobial Agents 新型 1,3,4-恶二唑和苯并[d]咪唑支架作为前景看好的抗菌剂的合成与生物评价研究
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2024-04-02 DOI: 10.3103/S0027131424010036
Dinesh. R. Godhani, Anwar. H. Saiyad, Jignasu. P. Mehta, Umang. P. Mehta
{"title":"Synthesis and Biological Evaluation Studies of Novel 1,3,4-Oxadiazole and Benzo[d]imidazole Scaffolds as Promising Antimicrobial Agents","authors":"Dinesh. R. Godhani,&nbsp;Anwar. H. Saiyad,&nbsp;Jignasu. P. Mehta,&nbsp;Umang. P. Mehta","doi":"10.3103/S0027131424010036","DOIUrl":"10.3103/S0027131424010036","url":null,"abstract":"<p>We prepared a novel series of 1,3,4-oxadiazole and benzo[d]imidazolecontaining fi fteen new connections to develop potential antimicrobial agents (9a–9o). The structures of this new series were characterized by various spectral techniques like IR, <sup>1</sup>H NMR, <sup>13</sup>C NMR, LC–MS, and elemental analysis. Using the Broth Dilution method, the hybrids were examined for antimicrobial activity against a variety of bacterial and fungal strains. Compound 9n (MIC = 50 μg/mL) exhibited good activity against gramnegative <i>E. coli</i> and compound 9m (MIC = 50 μg/mL) showed potent activity against <i>P. aeruginosa.</i> While compounds 9c, 9f, 9g and 9m indicated MIC = 250 μg/mL against <i>C. albicans</i>.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"79 1","pages":"63 - 71"},"PeriodicalIF":0.7,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140589283","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
Changes in the Physicochemical and Biological Properties of Aqueous Solutions under the Influence of Factors Modeling the Conditions of Space Flight 太空飞行条件模拟因素影响下水溶液物理化学和生物性质的变化
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2023-10-13 DOI: 10.3103/S002713142306007X
I. S. Ryzhkina, L. I. Murtazina, Y. V. Kiseleva, S. Yu. Sergeeva, S. A. Ryzhkin, M. Ya. Melnikov
{"title":"Changes in the Physicochemical and Biological Properties of Aqueous Solutions under the Influence of Factors Modeling the Conditions of Space Flight","authors":"I. S. Ryzhkina,&nbsp;L. I. Murtazina,&nbsp;Y. V. Kiseleva,&nbsp;S. Yu. Sergeeva,&nbsp;S. A. Ryzhkin,&nbsp;M. Ya. Melnikov","doi":"10.3103/S002713142306007X","DOIUrl":"10.3103/S002713142306007X","url":null,"abstract":"<p>The results of studies in which the relationship of the self-organization, physicochemical properties, and bioeffects in dilute aqueous solutions of various biologically active substances sustained under natural and reduced levels of external physical fields (geomagnetic and low-frequency electromagnetic), as well as under exposure to ionizing radiation solutions studied by the complex of physicochemical methods, are considered. The established patterns can be used to create a scientific base related to the clarification of the mechanisms of the negative influence of hypomagnetic conditions on the functioning of living organisms necessary to ensure the normal operation of the ecosystem of spacecraft during flights.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"78 6","pages":"314 - 323"},"PeriodicalIF":0.7,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41228872","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
Rheology of Structured Liquids: Newtonian Behavior 结构液体的流变学：牛顿行为
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2023-10-13 DOI: 10.3103/S0027131423060068
V. N. Matveenko, E. A. Kirsanov
{"title":"Rheology of Structured Liquids: Newtonian Behavior","authors":"V. N. Matveenko,&nbsp;E. A. Kirsanov","doi":"10.3103/S0027131423060068","DOIUrl":"10.3103/S0027131423060068","url":null,"abstract":"<p>In this paper, we analyze the behavior of low-molecular-weight non-Newtonian fluids (liquid paraffin, silicone oil, and FC70 oil) in which the shear thinning phenomenon is observed at low shear rates. Over a wide range of a high shear rate, the behavior is described, which is similar to the Newtonian behavior in the case when the shear viscosity is practically constant. In terms of the structural rheological model, an explanation is proposed for this type of the Newtonian flow.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"78 6","pages":"326 - 330"},"PeriodicalIF":0.7,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41229310","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 Adsorption Layers of Polyelectrolytes on the Wetting and Modification of the Polystyrene Surface 聚电解质吸附层对聚苯乙烯表面润湿改性的影响
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2023-10-13 DOI: 10.3103/S0027131423060044
V. D. Dolzhikova, J. G. Bogdanova
{"title":"Influence of Adsorption Layers of Polyelectrolytes on the Wetting and Modification of the Polystyrene Surface","authors":"V. D. Dolzhikova,&nbsp;J. G. Bogdanova","doi":"10.3103/S0027131423060044","DOIUrl":"10.3103/S0027131423060044","url":null,"abstract":"<p>The adsorption of cationic and anionic polyelectrolytes (PEs) from aqueous solutions on the polystyrene surface is studied by quartz crystal microbalance (QCM) and contact angle measurements. It is shown that, despite the multilayer nature of adsorption, only a monolayer of PE macromolecules is firmly retained on the polymer surface, and the polystyrene surface is hydrophilized. It is shown that with the complete monolayer filling of the surface, the degree of modification of the polystyrene surface does not depend on the nature of the studied PEs, and the modifying monolayers provide the value of the polystyrene/water interfacial energy, which indicates the potential biocompatibility of the material based on the modified polystyrene.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"78 6","pages":"331 - 337"},"PeriodicalIF":0.7,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41229311","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
Quantitative Immunofluorescence Evaluation of PD-L1 Expression in Non-Muscle-Invasive and Muscle-Invasive Urothelial Bladder Cancer 非肌肉性和肌肉性尿路上皮癌症中PD-L1表达的定量免疫荧光评价
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2023-10-13 DOI: 10.3103/S0027131423060032
T. A. Bogush, K. S. Spiridonova, E. A. Bogush, A. N. Grishanina, A. M. Scherbakov, M. I. Volkova, Z. M. Safarov, V. B. Matveev, V. S. Kosorukov
{"title":"Quantitative Immunofluorescence Evaluation of PD-L1 Expression in Non-Muscle-Invasive and Muscle-Invasive Urothelial Bladder Cancer","authors":"T. A. Bogush,&nbsp;K. S. Spiridonova,&nbsp;E. A. Bogush,&nbsp;A. N. Grishanina,&nbsp;A. M. Scherbakov,&nbsp;M. I. Volkova,&nbsp;Z. M. Safarov,&nbsp;V. B. Matveev,&nbsp;V. S. Kosorukov","doi":"10.3103/S0027131423060032","DOIUrl":"10.3103/S0027131423060032","url":null,"abstract":"<p>The expression of PD-L1 protein is quantified in 56 samples of urothelial bladder cancer (BC). PD-L1 expression is detected in all BC samples, while in non-muscle-invasive bladder cancer (NMIBC) this score is 1.5 times higher than in muscle-invasive bladder cancer (MIBC) (<i>p</i> = 0.001). High PD-L1 expression level (≥30%) is observed in 20% of MIBC samples and among NMIBC tumors in 68% of cases, i.e., 3.4 times more often (<i>p</i> = 0.0004). The last fact justifies the prospect of starting therapy with immune checkpoint inhibitors at the onset of the disease for NMIBC.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"78 6","pages":"338 - 343"},"PeriodicalIF":0.7,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41228873","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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