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New Accelerated “Green” Synthesis of a Tungsten–Unithiol Complex 全新加速 "绿色 "合成钨-硫醇络合物
IF 0.8
Nanotechnologies in Russia Pub Date : 2024-09-10 DOI: 10.1134/S2635167623601316
P. D. Kuznetsova, E. A. Mukhanova, A. A. Tereshchenko, E. R. Kolomenskaya, A. V. Soldatov
{"title":"New Accelerated “Green” Synthesis of a Tungsten–Unithiol Complex","authors":"P. D. Kuznetsova,&nbsp;E. A. Mukhanova,&nbsp;A. A. Tereshchenko,&nbsp;E. R. Kolomenskaya,&nbsp;A. V. Soldatov","doi":"10.1134/S2635167623601316","DOIUrl":"10.1134/S2635167623601316","url":null,"abstract":"<p>Unithiol, as a biologically active ligand that forms stable complexes with metals, is of significant interest and requires systematic research when designing efficient medicinal agents. The accelerated “green” synthesis of a tungsten complex with unithiol as a ligand is carried out using two methods: ultrasonic and microwave. The precursors to this reaction are an extract of <i>Picea pungens</i> Engelm. spruce needles as a natural source of presumably bioactive unithiol and sodium tungstate; the reaction duration is 15 min. X-ray absorption spectra (XANES) near the <i>L</i><sub>3</sub> edge of tungsten absorption for a tungsten–unithiol complex are obtained and qualitatively analyzed for the first time.</p>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":"19 2","pages":"253 - 257"},"PeriodicalIF":0.8,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142193175","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
Operando Cell for Synchrotron Studies of Gas Sensors 用于同步辐射气体传感器研究的操作室
IF 0.8
Nanotechnologies in Russia Pub Date : 2024-09-10 DOI: 10.1134/S2635167624600810
M. A. Gritsai, V. A. Polyakov, P. V. Medvedev, Yu. Yu. Zhityaeva, O. I. Il’in, M. A. Soldatov
{"title":"Operando Cell for Synchrotron Studies of Gas Sensors","authors":"M. A. Gritsai,&nbsp;V. A. Polyakov,&nbsp;P. V. Medvedev,&nbsp;Yu. Yu. Zhityaeva,&nbsp;O. I. Il’in,&nbsp;M. A. Soldatov","doi":"10.1134/S2635167624600810","DOIUrl":"10.1134/S2635167624600810","url":null,"abstract":"<div><p>A cell for conducting operando measurements of X-ray absorption spectra for gas-sensitive sensors based on ZIF-8/ZIF-67 nanofilms is developed and fabricated. The cell is made of stainless steel, which makes it possible to study, among other things, corrosive gases. The possibility of heating and continuous measurement of the sensor temperature during an operando experiment to evaluate the dynamics of sorption in the processes of heating/cooling the cell. The isolated sensor holder has contacts for measuring the capacitance/resistance of the sensor. To measure X-ray absorption spectra for gas-sensitive gas-sensor materials, an X-ray transparent window is provided. For sensors based on ZIF-8 and ZIF-67 nanofilms, the X-ray absorption spectra are measured for the <i>K</i> edges of Zn and Co, respectively. It is found that after exposure to NO<sub>2</sub> in a gas-sensitive material based on ZIF-8/ZIF-67 nanofilms, long-range order is lost and the film undergoes amorphization. The X-ray absorption spectra measured for a gas-sensitive material based on ZIF-8/ZIF-67 nanofilms before and after exposure to NO<sub>2</sub> indicate a change in the local atomic and electronic structures near cobalt atoms.</p></div>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":"19 2","pages":"269 - 274"},"PeriodicalIF":0.8,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142193177","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 Capabilities of the Fluorescence Spectroscopy Method for the Identification of Wine Varitality 荧光光谱法鉴定葡萄酒多样性的能力研究
IF 0.8
Nanotechnologies in Russia Pub Date : 2024-09-10 DOI: 10.1134/S2635167624600706
Ya. E. Sergeeva, V. M. Pozhidaev, D. Yu. Fedosov
{"title":"Study of the Capabilities of the Fluorescence Spectroscopy Method for the Identification of Wine Varitality","authors":"Ya. E. Sergeeva,&nbsp;V. M. Pozhidaev,&nbsp;D. Yu. Fedosov","doi":"10.1134/S2635167624600706","DOIUrl":"10.1134/S2635167624600706","url":null,"abstract":"<div><p>The chemical composition of a wine depends on several factors that determine the wine’s identity, including grape variety, geographic origin, biophysical environment of the vineyard, harvest conditions, and winemaking techniques. Analytical methods for varietal identification of wines are based mainly on determining the composition and content of volatile and phenolic compounds using various chromatographic methods that require highly qualified personnel and complex and expensive analytical instruments. Recently, the following aspects of wine analysis have become of paramount importance: speed, user-friendliness, and cost-effectiveness. One such method is three-dimensional fluorescence spectroscopy: a fast, noninvasive, sensitive and affordable method. The complete fluorescence landscape includes information about several fluorophores in the composition of a wine and can be considered as a characteristic “fingerprint” that will allow the identification of its varietal identity. The results of studying the use of three-dimensional fluorescence spectroscopy for the identification of wines depending on the grape variety are presented.</p></div>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":"19 2","pages":"311 - 316"},"PeriodicalIF":0.8,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142193184","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
Machine Learning for Determining the Architecture of Ensembles of Bimetallic PtCu Nanoparticles Based on Atomic Radial Distribution Functions 基于原子径向分布函数的机器学习法确定双金属铂铜纳米粒子集合的结构
IF 0.8
Nanotechnologies in Russia Pub Date : 2024-09-10 DOI: 10.1134/S2635167623601304
Ya. N. Gladchenko-Djevelekis, D. B. Tolchina, V. V. Srabionyan, V. A. Durymanov, L. A. Avakyan, L. A. Bugaev
{"title":"Machine Learning for Determining the Architecture of Ensembles of Bimetallic PtCu Nanoparticles Based on Atomic Radial Distribution Functions","authors":"Ya. N. Gladchenko-Djevelekis,&nbsp;D. B. Tolchina,&nbsp;V. V. Srabionyan,&nbsp;V. A. Durymanov,&nbsp;L. A. Avakyan,&nbsp;L. A. Bugaev","doi":"10.1134/S2635167623601304","DOIUrl":"10.1134/S2635167623601304","url":null,"abstract":"<p>It is known that the catalytic properties of materials based on bimetallic PtCu nanoparticles depend on both the composition and the distribution of atoms in these particles. Therefore, the development of new materials with improved catalytic properties requires the application of an accurate and reliable experimental method for determining the architecture of nanoparticles (NPs) (random solid solution, Janus, core–shell or “gradient”). Our previous study demonstrated through machine-learning simulations that the architecture of single bimetallic nanoparticles can be determined using accurate theoretically calculated paired atomic radial distribution functions (RDFs), which can also be obtained from the most common sources of NP structural information, such as the X-ray absorption spectroscopy (XAS) and X-ray diffraction (XRD) techniques. This work is a logical continuation of the research mentioned above and is devoted to a theoretical study of the influence of errors in determining the RDFs, as well as the influence of the size and composition distributions of nanoparticles on the possibility of determining the architecture of nanoparticles from their RDFs.</p>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":"19 2","pages":"208 - 212"},"PeriodicalIF":0.8,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142192856","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
New Gliobastoma Cell Lines: Analysis of Genetic Changes, and Assessment of Sensitivity to Radiotherapy and Immunotherapy 新胶质母细胞瘤细胞系：基因变化分析以及放疗和免疫疗法敏感性评估
IF 0.8
Nanotechnologies in Russia Pub Date : 2024-09-10 DOI: 10.1134/S2635167624600871
S. S. Emelianova, A. V. Volnitskiy, A. M. Solianik, N. H. Tran, L. A. Garaeva, R. A. Pantina, M. N. Grunina, E. D. Putevich, A. S. Potyseva, A. M. Golubev, V. S. Burdakov, N. A. Verlov, S. N. Naryzhnyy, A. L. Konevega, T. A. Shtam
{"title":"New Gliobastoma Cell Lines: Analysis of Genetic Changes, and Assessment of Sensitivity to Radiotherapy and Immunotherapy","authors":"S. S. Emelianova,&nbsp;A. V. Volnitskiy,&nbsp;A. M. Solianik,&nbsp;N. H. Tran,&nbsp;L. A. Garaeva,&nbsp;R. A. Pantina,&nbsp;M. N. Grunina,&nbsp;E. D. Putevich,&nbsp;A. S. Potyseva,&nbsp;A. M. Golubev,&nbsp;V. S. Burdakov,&nbsp;N. A. Verlov,&nbsp;S. N. Naryzhnyy,&nbsp;A. L. Konevega,&nbsp;T. A. Shtam","doi":"10.1134/S2635167624600871","DOIUrl":"10.1134/S2635167624600871","url":null,"abstract":"<div><p>The characteristics of six new glioblastoma cell lines obtained from tumor material from patients are presented. The studied glioblastomas do not have mutations in the genes <i>IDH1</i> and <i>IDH2</i>, which indicated a poor prognosis for their therapy. Two glioblastomas carry the pathogenic mutation p.Arg110Pro in the gene <i>TP53.</i> All cell lines studied express RNA of tumor suppressor and oncogenic isoforms of the p73 protein. The glioblastomas responded differently to radiotherapy, with five of them being more resistant to γ irradiation than the standard A172 glioma line. All six cell lines express RNA genes for vascular endothelial growth factor and its receptor (VEGFR-1) in different ratios. Testing of an immunotherapeutic regimen with monoclonal antibodies to VEGFR-1 on one of the cell lines confirms that the studied glioblastomas are sensitive to blocking vascular growth factor and its receptor. Thus, these glioblastomas can become a promising model for studying the formation of tumor-cell resistance to radiotherapy and the effectiveness of immunotherapy that blocks growth factors and their receptors.</p></div>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":"19 2","pages":"282 - 290"},"PeriodicalIF":0.8,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142193179","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
Microfluidic Processes As an Element of Bioinspired Technologies 作为生物启发技术要素的微流控过程
IF 0.8
Nanotechnologies in Russia Pub Date : 2024-09-10 DOI: 10.1134/S2635167624600214
M. A. Marchenkova, S. V. Chapek, E. A. Mukhanova, A. V. Soldatov, M. V. Kovalchuk
{"title":"Microfluidic Processes As an Element of Bioinspired Technologies","authors":"M. A. Marchenkova,&nbsp;S. V. Chapek,&nbsp;E. A. Mukhanova,&nbsp;A. V. Soldatov,&nbsp;M. V. Kovalchuk","doi":"10.1134/S2635167624600214","DOIUrl":"10.1134/S2635167624600214","url":null,"abstract":"<p>Modern microfluidic technologies play an important role in scientific research, medicine, pharmacology, ecology, and biotechnologies and nanotechnologies. The significance of microfluidic processes within bioinspired technologies and their potential for the development of new methods and applications is considered. An important advantage of microfluidic technologies is the ability to work with very small volumes of liquid or gas, which allows one to reduce the consumption of reagents, increase the sensitivity and accuracy of analysis, and shorten the time of analysis, processing, and obtaining of samples. Advances in microfluidic technologies, their advantages and potential applications, as well as prospects for the development of this field are described.</p>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":"19 2","pages":"266 - 268"},"PeriodicalIF":0.8,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142193182","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 Albumin Nanoparticles with Immobilized and Incorporated Fluorophores and Drugs, Properties and Release Profiles 带有固定和整合荧光团及药物的白蛋白纳米粒子的合成、性质和释放曲线
IF 0.8
Nanotechnologies in Russia Pub Date : 2024-09-10 DOI: 10.1134/S2635167624600561
G. A. Shulmeyster, Yu. D. Chekmeneva, M. A. Baibakova, D. V. Korolev
{"title":"Synthesis of Albumin Nanoparticles with Immobilized and Incorporated Fluorophores and Drugs, Properties and Release Profiles","authors":"G. A. Shulmeyster,&nbsp;Yu. D. Chekmeneva,&nbsp;M. A. Baibakova,&nbsp;D. V. Korolev","doi":"10.1134/S2635167624600561","DOIUrl":"10.1134/S2635167624600561","url":null,"abstract":"<p>The synthesis of albumin nanoparticles was performed sequentially using the methods of pH-coacervation, desolvation and cross-linking with glutaraldehyde. The resulting particles have a shape close to spherical. A dependence of the sizes of the resulting particles on the desolvation rate was described. Immobilization of two fluorescent dyes, indocyanine green and sodium fluorescein, as well as the anti-ischemic drug quinacrine, was carried out on the surface of nanoparticles, which made it possible to obtain prolonged release forms. For quinacrine immobilized on the surface of nanoparticles, noticeable release of quinacrine ends by 30 h from the start of the experiment and accounts for 65% of the immobilized active substance. Fluorescent dyes were not released during this period.</p>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":"19 2","pages":"305 - 310"},"PeriodicalIF":0.8,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142193183","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 Simulation Box Sizes on the Stability of Lysozyme Dimers and Hexamers in a Crystallization Solution 模拟盒尺寸对溶菌酶二聚体和六聚体在结晶溶液中稳定性的影响
IF 0.8
Nanotechnologies in Russia Pub Date : 2024-09-10 DOI: 10.1134/S2635167624600767
Yu. V. Kordonskaya, I. F. Garipov, V. I. Timofeev, M. A. Marchenkova, Yu. A. Dyakova, Yu. V. Pisarevsky, M. V. Kovalchuk
{"title":"Influence of Simulation Box Sizes on the Stability of Lysozyme Dimers and Hexamers in a Crystallization Solution","authors":"Yu. V. Kordonskaya,&nbsp;I. F. Garipov,&nbsp;V. I. Timofeev,&nbsp;M. A. Marchenkova,&nbsp;Yu. A. Dyakova,&nbsp;Yu. V. Pisarevsky,&nbsp;M. V. Kovalchuk","doi":"10.1134/S2635167624600767","DOIUrl":"10.1134/S2635167624600767","url":null,"abstract":"<p>The effect of the simulation box size on the stability of lysozyme dimers and hexamers formed in its solution before crystallization is studied by molecular dynamics. The behavior of these oligomers in boxes of different sizes is simulated, and their stability is assessed. It is shown that increasing the simulation box does not lead to refinement of the simulation results. The dimer stability weakly depends on the box sizes, while hexamers dissociated in all boxes considered, which is consistent with small-angle scattering data. The minimum distance between the protein and the box edge, at which the results of modeling oligomer behavior in crystallization solutions are reliable, is determined (1 nm).</p>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":"19 2","pages":"179 - 182"},"PeriodicalIF":0.8,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S2635167624600767.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142193110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Technology for Manufacturing TSV Structures for the Creation of Silicon Interposers Using Temporary-Bonding Technology 利用临时粘合技术制造用于创建硅中间膜的 TSV 结构的技术
IF 0.8
Nanotechnologies in Russia Pub Date : 2024-09-10 DOI: 10.1134/S2635167624600408
N. A. Djuzhev, E. E. Gusev, M. Yu. Fomichev, P. S. Ivanin
{"title":"Technology for Manufacturing TSV Structures for the Creation of Silicon Interposers Using Temporary-Bonding Technology","authors":"N. A. Djuzhev,&nbsp;E. E. Gusev,&nbsp;M. Yu. Fomichev,&nbsp;P. S. Ivanin","doi":"10.1134/S2635167624600408","DOIUrl":"10.1134/S2635167624600408","url":null,"abstract":"<p>For the first time in Russia, we present a technology for temporary wafer bonding, which is used to form through holes in silicon (through-silica via (TSV) structures) with a high aspect ratio of depth to diameter (more than 10 to 1), as well as a method for transferring alignment marks from the front to the back side of a thin Si wafer, consisting in the use of a glass carrier plate, which allows for a sufficient amount of deflection of the assembly for lithography. The modernized operating parameters of Si-glass bonding, which consist in controlling the cooling rate of the plates and applying pressure to the plates during their cooling phase, ensure a reduction in the deflection of the resulting assembly by 75% before thinning and by 65% after thinning to a residual thickness of 125 μm while maintaining the mechanical integrity of the plates.</p>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":"19 2","pages":"197 - 207"},"PeriodicalIF":0.8,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142192855","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
First-Principles Calculation and X-ray Photoelectron Spectroscopy of Rutile-Like Transition Metal Oxides TiO2 and MoO2 类金红石过渡金属氧化物 TiO2 和 MoO2 的第一原理计算和 X 射线光电子能谱分析
IF 0.8
Nanotechnologies in Russia Pub Date : 2024-09-10 DOI: 10.1134/S2635167623601298
M. D. Manyakin, S. I. Kurganskii, N. I. Boikov, I. S. Kakuliia, S. V. Kannykin, O. A. Chuvenkova, R. G. Chumakov, A. M. Lebedev, S. Yu. Turishchev
{"title":"First-Principles Calculation and X-ray Photoelectron Spectroscopy of Rutile-Like Transition Metal Oxides TiO2 and MoO2","authors":"M. D. Manyakin,&nbsp;S. I. Kurganskii,&nbsp;N. I. Boikov,&nbsp;I. S. Kakuliia,&nbsp;S. V. Kannykin,&nbsp;O. A. Chuvenkova,&nbsp;R. G. Chumakov,&nbsp;A. M. Lebedev,&nbsp;S. Yu. Turishchev","doi":"10.1134/S2635167623601298","DOIUrl":"10.1134/S2635167623601298","url":null,"abstract":"<div><p>The results of studying the electronic structure of transition-metal oxides TiO<sub>2</sub> and MoO<sub>2</sub> with a rutile-type crystal structure are presented. The electronic structure is studied theoretically within the framework of the linearized augmented-plane-wave method using the Wien2k software package. The band structure, and the total and partial densities of electronic states are calculated. Based on the filling of energy bands with electrons, an explanation is given for the different types of electrical conductivity of TiO<sub>2</sub> and MoO<sub>2</sub>. The valence band and subvalent states of commercial TiO<sub>2</sub> and MoO<sub>2</sub> samples in the form of powders at two different excitation energies of 120 and 1486.6 eV are studied using X-ray photoelectron spectroscopy. Based on calculations, the observed features of the structure of the experimentally recorded spectra are interpreted.</p></div>","PeriodicalId":716,"journal":{"name":"Nanotechnologies in Russia","volume":"19 2","pages":"237 - 242"},"PeriodicalIF":0.8,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142193172","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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