排序方式: 共有69条查询结果,搜索用时 15 毫秒
21.
22.
23.
Dr. Anton A. Ivanov Tatiana N. Pozmogova Dr. Anastasiya O. Solovieva Dr. Tatiana S. Frolova Dr. Olga I. Sinitsyna Dr. Olga V. Lundovskaya Dr. Alphiya R. Tsygankova Dr. Mohamed Haouas Prof. David Landy Prof. Enrico Benassi Prof. Lidiya V. Shestopalova Dr. Clément Falaise Prof. Emmanuel Cadot Dr. Michael A. Shestopalov Dr. Pavel A. Abramov Prof. Maxim N. Sokolov 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(33):7479-7485
Specific molecular recognition of γ-cyclodextrin (γ-CD) by the cationic hexanuclear niobium [Nb6Cl12(H2O)6]2+ cluster complex in aqueous solutions results in a 1:1 supramolecular assembly {[Nb6Cl12(H2O)6]@γ-CD}2+. NMR spectroscopy, isothermal titration calorimetry (ITC), and ESI-MS were used to study the interaction between the inorganic cluster and the organic macrocycle. Such molecular association affects the biological activity of [Nb6Cl12(H2O)6]2+, decreasing its cytotoxicity despite enhanced cellular uptake. The 1:1 stoichiometry is maintained in solution over a large window of the reagents’ ratio, but crystallization by slow evaporation produces a 1:2 host–guest complex [Nb6Cl12(H2O)6@(γ-CD)2]Cl2 ⋅ 20 H2O featuring the cluster encapsulated between two molecules of γ-CD. The 1:2 complex was characterized by XRD, elemental analysis, IR spectroscopy, and thermogravimetric analysis (TGA). Quantum chemical calculations were performed to model host–guest interaction. 相似文献
24.
A. R. Tsygankova O. V. Lundovskaya A. I. Saprykin 《Journal of Analytical Chemistry》2016,71(2):179-184
The paper presents a multi-element analysis of europium, yttrium and lanthanum compounds by atomic emission spectrometry with inductively coupled plasma (ICP-AES). The plasma power was optimized, the choice of analytical lines of the impurities to be determined and the concentration of matrix element were substantiated. The method allows to determine up to 40 trace elements with the limits of detection (LODs) ranging from 10–6 to 10–3 wt %. 相似文献
25.
N. S. Medvedev A. R. Tsygankova V. F. Kukarin A. I. Saprykin 《Journal of Analytical Chemistry》2014,69(6):590-597
Possibilities of electrothermal sample vaporization in inductively coupled plasma atomic emission spectrometry (ETV-ICP-AES) in the analysis of high-purity reagents were studied on an example high-purity waters, acid solutions, and trace impurity concentrates. The analytical and background signals in the injection of solutions into inductively coupled plasma (ICP) by pneumatic nebulization and electrothermal vaporization were compared and the of limits of detection in the analysis of high-purity reagents with impurity preconcentration by evaporation were estimated and compared. 相似文献
26.
Anton M. Manakhov Elizaveta S. Permyakova Natalya A. Sitnikova Alphiya R. Tsygankova Alexander Y. Alekseev Maria V. Solomatina Victor S. Baidyshev Zakhar I. Popov Lucie Blahov Marek Eli Lenka Zají
kov Andrey M. Kovalskii Alexander N. Sheveyko Philipp V. Kiryukhantsev-Korneev Dmitry V. Shtansky David Ne
as Anastasiya O. Solovieva 《Molecules (Basel, Switzerland)》2022,27(4)
The COVID-19 pandemic has raised the problem of efficient, low-cost materials enabling the effective protection of people from viruses transmitted through the air or via surfaces. Nanofibers can be a great candidate for efficient air filtration due to their structure, although they cannot protect from viruses. In this work, we prepared a wide range of nanofibrous biodegradable samples containing Ag (up to 0.6 at.%) and Cu (up to 20.4 at.%) exhibiting various wettability. By adjusting the magnetron current (0.3 A) and implanter voltage (5 kV), the deposition of TiO2 and Ag+ implantation into PCL/PEO nanofibers was optimized in order to achieve implantation of Ag+ without damaging the nanofibrous structure of the PCL/PEO. The optimal conditions to implant silver were achieved for the PCL-Ti0.3-Ag-5kV sample. The coating of PCL nanofibers by a Cu layer was successfully realized by magnetron sputtering. The antiviral activity evaluated by widely used methodology involving the cultivation of VeroE6 cells was the highest for PCL-Cu and PCL-COOH, where the VeroE6 viability was 73.1 and 68.1%, respectively, which is significantly higher compared to SARS-CoV-2 samples without self-sanitizing (42.8%). Interestingly, the samples with implanted silver and TiO2 exhibited no antiviral effect. This difference between Cu and Ag containing nanofibers might be related to the different concentrations of ions released from the samples: 80 μg/L/day for Cu2+ versus 15 µg/L/day for Ag+. The high antiviral activity of PCL-Cu opens up an exciting opportunity to prepare low-cost self-sanitizing surfaces for anti-SARS-CoV-2 protection and can be essential for air filtration application and facemasks. The rough cost estimation for the production of a biodegradable nanohybrid PCL-Cu facemask revealed ~$0.28/piece, and the business case for the production of these facemasks would be highly positive, with an Internal Rate of Return of 34%. 相似文献
27.
The quantitative structure-property relationship was used for estimating the activity of influenza virus neuraminidase inhibitors, cyclohexene and cyclopentane derivatives. Application of two models, topological and geometric, showed that in both cases the estimated activity is well consistent with the experimental data, but the geometric model is necessary when dealing with stereoisomers. The structural elements of the inhibitor “responsible” for the high activity were revealed. 相似文献
28.
G. P. Anisimova A. P. Gorbenko O. A. Dolmatova I. R. Krylov I. Ch. Mashek G. A. Tsygankova 《Optics and Spectroscopy》2016,120(2):184-191
The fine structure parameters of configurations 1snf (n = 4–10) with new refined energy values are calculated by the semiempirical method. The emphasis is on the study of the Zeeman structure in order to determine the gyromagnetic ratios of all four the levels of the configuration from the splitting. For this purpose, the matrices of an energy operator with allowance for the interaction between the atom and a magnetic field were diagonalized for all possible values of quantum number M. For each configuration, 17 values of crossing fields of the Zeeman sublevels with ΔМ = ±1, ±2 and the regions of anticrossings with ΔМ = 0 were determined. It is remarkable that, because the levels are closely spaced, anticrossings are observed for each pair of levels in these systems. The regions of linearity of a magnetic field, which are different for different configurations, and the levels in them are established. The g-factors are calculated from the coefficients of an intermediate coupling scheme in a magnetic field that is guaranteed to be linear. They are compared with the analogous values in the absence of a field. 相似文献
29.
Evgeniya D. Novikova Dr. Yuri A. Vorotnikov Dr. Nazar A. Nikolaev Dr. Alphiya R. Tsygankova Dr. Michael A. Shestopalov Dr. Olga A. Efremova 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(8):2818-2825
Photodynamic and photothermal therapies (PDT, and PTT, respectively) are promising candidates for multimodal anticancer therapies (i.e., combinations of therapies), since their action is based on mechanisms that generally cannot be resisted by cancer cells, that is, generation of highly oxidizing oxygen species and high temperature, respectively. Herein, hybrid materials that combine octahedral molybdenum clusters as potential PDT agents and plasmonic spherical gold nanoparticles (AuNPs) as PTT agents are reported. Partial overlap of the photoemission spectrum of the cluster and the surface plasmon resonance band of the AuNPs facilitates energy transfer between the photoactive components, which resulted in synergetic enhancement of their photophysical properties. Specifically, by careful selection of the spacing between the cluster and the gold nanoparticle, a significant increase in luminescence and photosensitizing properties of the cluster was achieved in comparison with similar, but gold-free, particles. On the other hand, the cluster complex facilitated energy conversion to heat by gold particles and hence increased the heating rate under laser irradiation. 相似文献
30.