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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yehia M. R., Smolyarova T. E., Shabanov A. V., Sushko E. S., Badun G. A., Kudryasheva N. S.
Заглавие : Adaptation of a bacterial bioluminescent assay to monitor bioeffects of gold nanoparticles
Место публикации : Bioengineering. - 2022. - Vol. 9, Is. 2. - Ст.61. - ISSN 2306-5354(eISSN), DOI 10.3390/bioengineering9020061
Примечания : Cited References: 91. - This research was funded by RFBR, N18-29-19003; RFBR, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science, N20-44-243001; and partly supported by the Program of the Federal Service for Surveillance on Consumer Rights Protection and Human Wellbeing, Fundamental Study 2020–2025 (Russian Federation)
Аннотация: Our current study aimed to adapt a bioluminescent bacteria-based bioassay to monitor the bioeffects of gold nanoparticles (AuNPs). Luminous marine bacteria Photobacterium phosphoreum and AuNPs modified with polyvinylpyrrolidone were employed; low-concentration (≤10−3 g/L) bioeffects of AuNPs were studied. Bioluminescence intensity was used as an indicator of physiological activity in bacteria. Two additional methods were used: reactive oxygen species (ROS) content was estimated with a chemiluminescent luminol method, and bacterial size was monitored using electron microscopy. The bacterial bioluminescent response to AuNPs corresponded to the “hormesis” model and involved time-dependent bioluminescence activation, as well as a pronounced increase in the number of enlarged bacteria. We found negative correlations between the time courses of bioluminescence and the ROS content in bacterial suspensions, demonstrating the relationship between bioluminescence activation and bacterial ROS consumption. The combined effects of AuNPs and a beta-emitting radionuclide, tritium, revealed suppression of bacterial bioluminescent activity (as compared to their individual effects) and a reduced percentage of enlarged bacteria. Therefore, we demonstrated that our bacteria-based bioluminescence assay is an appropriate tool to study the bioeffects of AuNPs; the bioeffects can be further classified within a unified framework for rapid bioassessment.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yasinskiy A. S., Padamata S. K., Polyakov P. V., Shabanov A. V.
Заглавие : An update on inert anodes for aluminium electrolysis
Место публикации : Non-Ferrous Met. - 2020. - Vol. 48, Is. 1. - P.15-23. - ISSN 20720807 (ISSN), DOI 10.17580/nfm.2020.01.03
Примечания : Cited References: 62. - The work is performed as a part of the state assignment for the science of Siberian Federal University, project number FSRZ-2020-0013. Use of equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” is acknowledged
Аннотация: This update includes the literature related to the inert anodes which were published in the past decade. The metallic anodes are widely regarded as promising candidates to replace the carbon anodes due to its attractive properties like good electrical conductivity, easy to manufacture and high resistance to high thermal shocks. The metals have been tested in pure state and alloy (binary, ternary) form. The oxide scale formed on the anode surface acts as a barrier between the electrolyte and the anode, which protects the anode from being dissolved. The layer of molten fluorides is formed between the scale and the metal anode after a certain time of polarization, and the oxide scale acts as a bipolar electrode. Metal like Cu is reduced at the internal side of the scale. This paper elaborates the effects of various parameters on the performance of the anode. Cu-based alloys (Cu – Ni – Fe and Cu – Al) have shown promising results and could perform well in low-temperature electrolytes. It has been well established that the Cu content in Cu – Ni – Fe and Cu – Al alloys plays a major role in the metal dissolution as the CuO/Cu2O scales formed on the outer layer act as a sacrificial one. The corrosion rate of an anode can be reduced by decreasing the operating temperature, which is possible by using the KF – AlF3 melts. The use of suspensions can increase the purity of the produced metal by stop-ping the anode products to come in contact with cathode metal. Many industries including RUSAL and ELYSIS are still conducting a considerable amount of research to develop an inert anode and are expecting to have a carbon-free cell in the nearest future.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bolobanschikova G. N., Rogozin D. Y., Firsova A. D., Rodionova, E. V., Degermendzhy N. N., Shabanov A. V.
Заглавие : Analysis of diatom algae from the water column and bottom sediments of Shira Lake (Khakassia, Russia)
Место публикации : Contemp. Probl. Ecol.: MAIK Nauka-Interperiodica / Springer, 2015. - Vol. 8, Is. 2. - P.173-185. - ISSN 1995, DOI 10.1134/S1995425515020031. - ISSN 19954263(eISSN)
Примечания : Cited References: 23. - This work was supported by Russian Foundation for Basic Research, project no. 13-05-00429-a and the Biodiversity Program for Basic Research, Russian Academy of Sciences, project no. 30.8.
Ключевые слова (''Своб.индексиров.''): paleolimnology--diatom algae--meromictic lake--sedimentation--cyclotella choctawhatcheeana--aulacoseira valida--aulacoseira ambigua
Аннотация: Lake Shira as a meromictic lake is object of interest for paleolimnological studies. In May 2011 core samples were collected from the bottom of Lake Shira and the species composition of diatom algae, which serve as bioindicators of the state of the lake, were studied. In addition, in 2012, seasonal water samples and material from sediment traps were collected and the species composition of diatoms in them was analyzed. The results of the analysis showed that the lake, like in previous years of research, was dominated by Cyclotella choctawhatcheeana Prasad. Diatoms were found twice in the studied core above the white carbonate layers and were absent in other layers. The species living in the lake at present were observed down to the first white carbonate layer, including the predominant Cyclotella choctawhatcheeana. This fact presumably proves the consistency of the species composition of diatoms and the overall stable condition of the lake since 1946 (Rogozin et al., 2005). Down to the second white carbonate layer, the dominant species were Aulcosira valida (Grunow) Krammer and Aulcosira italica (Grunow) Simonsen. Nitzchia sigmodea (Nitzsch) W. Smith and Fragilaria construens var. venter (Ehrenberg) Grunow were also observed at these depths, dating approximately to 1655-1690. These are freshwater species that belong to the diatoms of arctic, alpine, and temperate latitudes, which develop in shallow waters under moderate temperature conditions. This fact suggests that Lake Shira was less salty in the middle and end of the 17th century than today.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vetrov S.Ya., Timofeev I. V., Shabanov A. V.
Заглавие : Anisotropy of nonlinear optical transmission at the edge of the photonic band gap of an apodized layered medium
Место публикации : Optics and Spectroscopy (English translation of Optika i Spektroskopiya). - 2008. - Vol. 104, Is. 5. - P.751-755. - ISSN 0030-400X, DOI 10.1134/S0030400X08050172
Ключевые слова (''Своб.индексиров.''): anisotropy--light transmission--multilayers--photonic crystals--refractive index--spectrum analysis--transfer matrix method--multilayer structure--nonlinear effects--transmission spectrum--laser radiation
Аннотация: The effect of Kerr nonlinearity on the transmission of laser radiation in a one-dimensional photonic crystal has been investigated by the transfer-matrix method, modified to describe nonlinear effects. The crystal under study is a thin-film multilayer structure with a spatial distribution of the refractive index, which makes it possible to eliminate side bands in the transmission spectrum at each side of the photonic band gap and significantly increase the slope of the transmission curve. The transmission spectrum of such a photonic crystal structure has been studied for two opposite directions of laser radiation propagation. The anisotropy of nonlinear transmission is most pronounced near the edge of the photonic crystal band gap, which lies in the near-IR region. The proposed structure, having strong transmission anisotropy and sufficiently low reflection in the forward direction, can operate as an optical diode (analog of an electron diode). В© 2008 Pleiades Publishing, Ltd.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zamay G. S., Ivanchenko T., Shabanov A. V., Prinz V., Seleznev V., Sokolov A. E., Denisenko V. V., Zamay S. S.
Заглавие : Aptamer modified nickel microdiscs in magnetic field kill cancer cells
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Место публикации : VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016): abstracts/ ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk: KIP RAS SB, 2016. - Ст.P12.6. - P.563. - ISBN 978-5-904603-06-9 (Шифр -478014040)
Примечания : This work was supported by the Russian Scientific Fund (grant #14-15-00805)
Ключевые слова (''Своб.индексиров.''): nickel microdiscs--aptamer--magnetic field
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pankin P. S., Shabanov A. V., Maksimov D. N., Nabol S. V., Buzin D. S., Krasnov A. I., Romanenko G. A., Sutormin V. S., Gunyakov V. A., Zelenov, Fyodor V., Masyugin, Albert N., Vyatkin, Vladimir P., Nemtsev I. V., Volochaev M. N., Vetrov S. Ya., Timofeev I. V.
Заглавие : Asymmetric resonant light absorption in a chloroplast microstructure
Место публикации : J. Opt. Soc. Am. B. - 2023. - Vol. 40, Is. 1. - P.87-93. - ISSN 07403224 (ISSN), DOI 10.1364/JOSAB.477110. - ISSN 15208540 (eISSN)
Примечания : Cited References: 45
Аннотация: It is shown that in the chloroplast periodic structure with a defect, the resonant absorption of light can be implemented. It is found that the resonant light absorption depends significantly on the position of a defect. In terms of the absorption of light energy, an asymmetric resonator is more efficient than a symmetric one.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vladimirova A. V., Murueva A. V., Shershneva A. M., Prudnikova S. V., Shabanov A. V., Shishatskaya E. I.
Заглавие : Biocompatible systems for controlled delivery of antiseptics for topical application
Колич.характеристики :14 с
Место публикации : J. Sib. Fed. Univ. Biol. - 2024. - Vol. 17, Is. 1. - P.19-32. - ISSN 19971389 (ISSN); Журн. СФУ. Биол. - ISSN 23135530 (eISSN)
Примечания : Cited References: 28
Аннотация: Controlled drug delivery is one of the frontier areas of science, which uses an interdisciplinary approach. The delivery systems offer numerous advantages over conventional dosage forms, such as improved efficacy and patient compatibility, reduced toxicity, and ease of use. Such systems often use micro- and nanoparticles as carriers for drugs, the prolonged effect of which is achieved due to the controlled slow release of the encapsulated drug. This study investigated the effects of encapsulation of various antiseptics (brilliant green, miramistin, and furacilin) and the chemical composition of the polymer on the yield, structure, size, drug release kinetics, and antibacterial activity of microparticles produced from resorbable polyesters of microbiological origin, polyhydroxyalkanoates. Microparticles with a 5.6–94.8 μm diameter were produced. The form of the active substance molecule has been found to be the most significant factor affecting the characteristics of polyhydroxyalkanoate microparticles. The surface structure of particles is rather determined by the chemical composition of the polymer, and the release kinetics to the model medium depends on the encapsulated drug. Microparticles based on PHAs loaded with brilliant green and furacilin showed antibacterial effects in S. aureus and E. coli cultures. The study demonstrated that microparticles with antiseptics encapsulated in them have potential as prolonged drug delivery systems and are of interest for further research.Технология контролируемой доставки лекарств является одной из передовых областей науки, включающей междисциплинарный научный подход. Эти системы доставки обладают многочисленными преимуществами по сравнению с обычными лекарственными формами, такими как повышенная эффективность и биосовместимость, сниженная токсичность и простота использования. В таких системах в качестве носителей лекарственных средств часто используют микро- и наночастицы, пролонгированное действие которых достигается за счет контролируемого медленного высвобождения инкапсулированного лекарственного средства. В данном исследовании изучалось влияние включения различных антисептиков (бриллиантовый зелёный, мирамистин и фурацилин), а также химического состава полимера на выход, структуру, размер, кинетику высвобождения лекарственных средств и антибактериальную активность микрочастиц, полученных из резорбируемых полиэфиров микробиологического происхождения, полигидроксиалканоатов. Было получено семейство микрочастиц диаметром 5,6–94,8 мкм. Установлено, что наиболее значимым фактором, влияющим на характеристики микрочастиц полигидроксиалканоатов, является форма молекулы активного вещества. Структура поверхности частиц больше зависит от химического состава полимера, а кинетики выхода в модельную среду – от инкапсулированного лекарства. Микрочастицы на основе ПГА с депонированными бриллиантовым зеленым и фурацилином показали антибактериальное действие в культурах S. aureus и E. coli. Результаты продемонстрировали, что микрочастицы с депонированными антисептиками обладают потенциалом в качестве систем пролонгированной доставки и представляют интерес для дальнейших исследований.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Flerov I. N., Kartashev A. V., Gorev M. V., Cherepakhin A. V., Sablina K. A., Mikhashenok N. V., Volkov N. V., Shabanov A. V.
Заглавие : Caloric effects and phase transitions in ferromagnetic-ferroelectric composites xLa(0.7)Pb(0.3)MnO(3)-(1-x)PbTiO3
Коллективы : Russian Foundation for Basic Research [12-02-31253-mol-a]; Federal Special Program "Scientific and scientific-pedagogical staff of innovative Russia" [N 8379]; Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools [NSh-4828.2012.2]
Место публикации : J. Mater. Res. - 2013. - Vol. 28, Is. 24. - P.3322-3331. - ISSN 0884-2914, DOI 10.1557/jmr.2013.360. - ISSN 2044-5326
Примечания : Cited References: 24. - This study was supported in parts by The Russian Foundation for Basic Research (Grant No. 12-02-31253-mol-a), Federal Special Program "Scientific and scientific-pedagogical staff of innovative Russia" (N 8379), and Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools (Grant NO. NSh-4828.2012.2). Dr. Maxim S. Molokeev is acknowledged for the x-ray characterization of the samples.
Предметные рубрики: PRESSURE
TEMPERATURE
Аннотация: Ceramic volumetric composites xLa(0.7)Pb(0.3)MnO(3)-(1-x)PbTiO3 (x = 0.18 and 0.85) were prepared. X-ray investigations have shown that rather low sintering temperature (800 degrees C) has allowed us to avoid the reaction and interdiffusion between two initial phases. Heat capacity, thermal expansion, and intensive magnetocaloric effect were measured in a wide temperature range. The sample composition has a low influence on temperatures of the ferromagnetic and ferroelectric phase transitions in composites. Electro- and barocaloric effects were determined by analysis in the framework of thermodynamic theory, electric equation of state, Maxwell relationships, and entropy-temperature-pressure phase diagram. Multicaloric efficiency of composites is discussed and compared with that of initial La0.7Pb0.3MnO3 and PbTiO3 compounds. Variation of a relationship between components can significantly increase both barocaloric and magnetocaloric efficiency of compositional material due to the mechanical stress appearing between grains of different ferroic phases under magnetic field.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shabanov A. V., Presnyakov V. V., Zyryanov V. Y., Vetrov S. Y.
Заглавие : Characteristics of the process of reorientation of bipolar drops of a nematic with rigidly fixed poles
Место публикации : JETP Letters. - 1998. - Vol. 67, Is. 9. - P.733-737. - ISSN 0021-3640, DOI 10.1134/1.567739
Примечания : Cited References: 9
Аннотация: The director configuration in a bipolar drop of a nematic with rigidly fixed poles is calculated as a function of the electric field directed perpendicular to the symmetry axis of the drop. It is shown that the reorientation of the drop is a dual process: a threshold process in the region where the initial director orientation is orthogonal to the electric field, and a nonthreshold process elsewhere in the drop. A relation for determining the critical field is obtained. Experimental investigations of the characteristics of scattered light for a film of polymer-encapsulated liquid crystals confirm the computational results. (C) 1998 American Institute of Physics. [S0021-3640(98)01709-5].
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sukhanova, Anna, Boyandin, Anatoly, Ertiletskaya, Natalya, Shalygina, Taisia, Shabanov A. V., Vasiliev, Alexander, Obvertkin, Ivan, Brott, Valeria, Prokopchuk, Yulia, Samoilo, Alexander
Заглавие : Composite polymer granules based on poly-ε-caprolactone and montmorillonite prepared by solution-casting and melt extrusion
Колич.характеристики :20 с
Место публикации : Polymers. - 2023. - Vol. 15, Is. 20. - Ст.4099. - ISSN 20734360 (eISSN), DOI 10.3390/polym15204099
Примечания : Cited References: 45. - This research was supported by a grant from the Russian Science Foundation, project No. 23-16-00184
Аннотация: Eco-friendly polymer composites in the form of granules based on biodegradable polycaprolactone (PCL) with the inclusion of montmorillonite (MMT) from 5 to 50 wt% were prepared by solution-casting and melt extrusion. The physicochemical properties of the composite granules were studied using FTIR spectroscopy, XRDA, DSC, and TGA methods. The paper presents comparative values of crystallinity of composite granules which depend on the method of measuring (XRDA, DSC). It was shown that the crystallinity of PCL/MMT granules was affected by the preparation method and by the MMT content, and that with increase in MMT content, crystallinity increased by up to 61–67%. The change in crystallinity of the granules also affected its biodegradation in soil. At the end of exposure in soil, the mass loss for the granules prepared by solution-casting was more than 90%, whereas for the composite granules prepared by extrusion it was less than 60%. Applying melt extrusion enabled obtaining intercalated composites with predictable features, whereas only mixed-structure microcomposites could be prepared by solution-casting.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Popkov S. I., Sabitova E. I., Semenov S. V., Shaykhutdinov K. A., Shabanov A. V., Petrov M. I.
Заглавие : Compression of a magnetic flux in the intergrain medium of a YBa2Cu3O7 granular superconductor from magnetic and magnetoresistive measurements
Разночтения заглавия :авие SCOPUS: Compression of a magnetic flux in the intergrain medium of a YBa 2Cu 3O 7 granular superconductor from magnetic and magnetoresistive measurements
Место публикации : J. Appl. Phys.: AMER INST PHYSICS, 2011. - Vol. 110, Is. 9. - Ст.93918. - ISSN 0021-8979, DOI 10.1063/1.3657775
Примечания : Cited References: 21. - We thank V. V. Val'kov and A. D. Balaev for useful discussions of the results and I. Nemtsev for microscopic study of the samples. The study was supported by the Program of the Russian Academy of Sciences No. 5, Project No. 7.
Предметные рубрики: HIGH-TEMPERATURE SUPERCONDUCTORS
CRITICAL-CURRENT-DENSITY
CRITICAL-STATE MODEL
CRITICAL CURRENTS
JOSEPHSON MEDIUM
FIELD
TRANSITION
Ключевые слова (''Своб.индексиров.''): effective field--external fields--field dependence--field induced--granular superconductors--inter-grain--josephson--magnetoresistive--space between--superconducting grains--transport currents--electric resistance--magnetic flux--magnetic moments--superconductivity--superconducting materials
Аннотация: A method to determine a value of the effective field in the intergrain medium of a granular superconductor is proposed. The space between superconducting grains is considered to be a Josephson medium where passage of the transport current causes dissipation and the effective field is superposition of external field H and the field induced by magnetic moments of superconducting grains. The method proposed is based on the comparison of hysteresis field dependences of magnetoresistance and magnetization and their relaxation at H=const. By the example of granular YBa2Cu3O7, it is shown that, in the region of weak fields, the effective field in the intergrain medium exceeds by far the external field, i.e., compression of a magnetic flux occurs. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3657775]
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12.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Gunyakov V. A., Myslivets S. A., Gerasimov V. P., Arkhipkin V. G., Zyryanov V. Ya., Shabanov V. F., Shabanov A. V., Vetrov S. Y., Kamaev G. N.
Заглавие : Control of transmission spectra of planar photonic crystal with LC defect
Коллективы : XV International Symposium on Advanced Display Technologies
Место публикации : Proceedings of SPIE - The International Society for Optical Engineering/ sponsors: SPIE Russia Chapter, P.N. Lebedev Physical Institute, Russia, Russian Foundation of Basic Research, Society for Information Display, Russia, European Office of Aerospace Research and Development ; XV International Symposium on Advanced Display Technologies (2006 ; 03.10 - 05.10 ; Moscow). - 2007. - 6637. - С. 66370L. - ISBN 0819467847, DOI 10.1117/12.742890 (Шифр 16957385)
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13.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Sokolov A. Е., Ivanova O. S., Svetlitsky E. S., Lukyanenko K. A., Shabanov A. V., Shestakov N. P., Chen Y. -Z., Tseng Y.-T., Lin C.-R.
Заглавие : Core-shell Fe3O4@C nanoparticles for magneto-mechanical destroy of Ehrlich ascites carcinoma cells
Коллективы : Asian School-Conference on Physics and Technology of Nanostructured Materials, Азиатская школа-конференция по физике и технологии наноструктурированных материалов
Место публикации : The Sixth Asian school-conference on physics and technology of nanostructured materials: Proceedings. - VLadivostok, 2022. - Ст.IV.o.08. - P.189-190. - ISBN 987-5-8044-1716-2
Примечания : Cited References: 2
Предметные рубрики:
Аннотация: The core-shell magnetic nanoparticles, Fe3O4@C, were synthesized and surface aptamer-functionalized to use them as destroyers of living cancer Ehrlich's ascitic carcinoma cells. The morphology and features of the structural and magnetic properties of the obtained hybrid nanoparticles are studied.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sofronova S. N., Moshkina E. M., Chernyshev A., Vasil'ev A. D., Maximov N., Aleksandrovsky A. S., Andryushchenko T., Shabanov A. V.
Заглавие : Crystal growth and cation order of Ni3-xCoxB2O6 oxyborates
Колич.характеристики :15 с
Место публикации : CrystEngComm. - 2024. - Article in press. - ISSN 14668033 (eISSN), DOI 10.1039/D4CE00091A
Примечания : Cited References: 28. - The research was funded by Russian Science Foundation and Krasnoyarsk Regional Fund of Science, project № 23-12-20012 (https://rscf.ru/en/project/23-12-20012/)
Аннотация: A series of single crystals of Ni3-xCoxB2O6 compounds with the kotoite structure and with different concentrations of transition metal ions (x = 0; 0,19; 0,6; 0,93; 2) were obtained. The lattice parameters and atomic coordinates were determined using X-ray diffraction. The theoretical calculations using the WIEN2k package predict that nickel ions tend to occupy the 4f crystallographic position, while cobalt ions tend to occupy the 2a crystallographic positions. The study of the diffuse scattering spectra and comparison of the Racah parameters for the compounds Ni3B2O6 and Co2NiB2O6 provides experimental evidence that the nickel ions occupy crystallographic position 4f.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shabanova O. V., Nemtsev I. V., Shabanov A. V.
Заглавие : Development of SEM method for analysis of organ-containing objects using inverse opals
Место публикации : Sib. J. Sci. Technol. - 2020. - Vol. 21, Is. 4. - P.565-573. - ISSN 2587-6066, DOI 10.31772/2587-6066-2020-21-4-565-573; \b Сибирский журнал науки и технологий
Примечания : Cited References: 25
Аннотация: The purpose of this study is to test the possibility of using inorganic macroporous structures of inverse opal in sample preparation for scanning electron microscopy of biological objects. As an absorbent substrate we used silica inverse opals prepared by a sol-gel method to study the biological objects.The process of manufacturing the inverse opal involves a complex multi-stage technological process. First, we synthesized submicron spherical particles from polymethylmethacrylate by the method of emulsifier-free emulsion polymerization of methylmethacrylate in an aqueous medium in the presence of a diazoinitiator. This method can be used to obtain an ensemble of particles with high monodispersity, the average size of which can vary in the range from 100 to 500 nm. Then, by self-assembly technique, we deposited the beads of polymethylmethacrylate into ordered matrices (templates), mainly with a face-centered cubic lattice. The resulting mesoporous structures, called artificial opals or colloidal crystals, had lateral dimensions of about 10 × 10 × 2 mm. Then we heat-treated the opals to 120 °C to harden the template before being impregnated with the precursor. Further, we impregnated the opals with silica sol with a particle size distribution from 1 to 5 nm, obtained by hydrolysis of tetraethoxysilane in the presence of hydrochloric acid, and then, after curing and drying the impregnating composition in air at room temperature, we multi-stage fired them up to 550 °C at normal pressure in the air atmosphere to remove all organic components. As a result, the macroporous metamaterial (the so-called inverse opals) with an open system of pores up to 400 nm in size, occupying about 80 % of the volume, were obtained. We studied lactic acid bacteria of cucumber brine and human red blood cells with TM4000 Plus, SU3500 and S-5500 scanning electron microscopes. Auxiliary substance for the sample preparation was ionic liquid VetexQ EM (Interlab LLC). We showed that it is possible to use the inverse opal as an absorbent substrate for sample preparation and rapid analysis in scanning electron microscopy without pre-drying, chemical treatment, or temperature exposure. To improve imaging in the electron microscope, we used sputter coater to cover the inverse opal surface with a thin film of platinum. The use of ionic liquid in combination with the absorbent porous medium allows preserving an original shape of the biological structures. Using the human red blood cells and lactic acid bacteria, we showed that it is possible to carry out of the morphological analysis of the cells using various scanning electron microscopes. We found that on the basis of the inverse opal, there is a fundamental possibility of creating the absorbent substrate suitable for repeated use in the study of the biological objects. At the same time, trace remnants of previous samples remaining after annealing the plate do not introduce significant distortions when conducting new series of observations. In this study, we obtained high-quality electronic micrographs of the biological objects with high resolution and contrast. At the same time, due to the use of the inverse opals as the absorbent substrate, time and financial costs for researchare reduced.Целью данного исследования является апробация возможности применения неорганических макропористых структур инверсного опала при пробоподготовке для сканирующей электронной микроскопии биообъектов. Изготовленные золь-гель способом инверсные опалы на основе кремнезёма применялись в качестве впитывающей подложки для изучения биологических образцов. Изготовление инверсного опала представляет собой сложный многоступенчатый технологический процесс. Сначала методом безэмульгаторной эмульсионной полимеризации метилметакрилата в водной среде в присутствии диазоинициатора были синтезированы субмикронные сферические частицы из полиметилметакрилата. Таким способом можно получать ансамбль частиц с высокой монодисперсностью, средний размер которых может варьироваться в диапазоне от 100 до 500 нм. Затем методом самосборки субмикросферы полиметилметакрилата осаждались в упорядоченные матрицы (шаблоны) преимущественно с гранецентрированной кубической решёткой. Полученные мезопористые структуры, называемые искусственными опалами или коллоидными кристаллами, имели размеры порядка 10 ×10 × 2 мм. Затем опалы подвергались термической обработке до 120 °С для упрочнения шаблона перед пропиткой прекурсором. Далее опалы пропитывались золем кремнезёма с размером частиц от 1 до 5 нм, полученным путём гидролиза тетраэтоксисилана в присутствии соляной кислоты и затем, после отверждения и сушки пропитывающего состава на воздухе при комнатной температуре, подвергались многоступенчатому обжигу до 550 °С при нормальном давлении в воздушной атмосфере для удаления всех органических компонентов. В результате получались образцы макропористых метаматериалов (так называемые, инверсные или инвертированные опалы) с открытой системой пор размером до 400 нм, занимающих около 80 % объёма. В сканирующих электронных микроскопах TM4000 Plus, SU3500 и S-5500 с использованием макропористых структур были исследованы молочнокислые бактерии и красные кровяные тельца. Для улучшения визуализации использовались системы напыления металлов для покрытия поверхности инверсного опала тонкой плёнкой платины. Вспомогательным веществом в пробоподготовке выступала ионная жидкость VetexQ EM (Interlab LLC). Показано, что инверсный опал можно использовать как впитывающую подложку для пробоподготовки и экспресс-анализа в сканирующей электронной микроскопии без предварительной сушки, химической обработки или температурного воздействия биообъектов. Использование ионной жидкости в сочетании с впитывающей пористой средой позволяет сохранить первоначальную форму биологических структур. Показана возможность изучения морфологических особенностей биоструктур на примере эритроцитов человека и молочнокислых бактерий. Экспериментально установлено, что впитывающую подложку на основе инверсного опала можно использовать многократно при исследовании биологических объектов. Следовые остатки предыдущих проб, оставшиеся после отжига пластины, не вносят существенных искажений при проведении новых серий наблюдений. В нашем исследовании были получены высококачественные электронные микрофотографии биообъектов с высоким разрешением и контрастом. При этом за счёт использования инверсных опалов в качестве впитывающей подложки обеспечивается сокращение временных и финансовых затрат на исследования.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Komogortsev S. V., Chekanova L. A., Shabanova O. V., Shabanov A. V., Nemtsev I. V., Neznakhin D. S., Denisova E. A., Felk V. A., Mohov A. A., Iskhakov R. S.
Заглавие : Dipole-dipole interaction weakening in ensembles of cobalt microspheres with a nonmagnetic core
Место публикации : Phys. Solid State. - 2022. - Vol. 64, Is. 9. - P.1263-1268. - ISSN 10637834 (ISSN), DOI 10.21883/PSS.2022.09.54163.16HH. - ISSN 10906460 (eISSN)
Примечания : Cited References: 32. - The study was done with financial support from the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory and the Krasnoyarsk Regional Fund of Science within scientific project No. 20-42-240001
Аннотация: Magnetic microspheres with nonmagnetic acrylic glass core were fabricated using electroless deposition. There are favorable conditions for magnetic flux closure within each particle. As a result, the dipole-dipole interaction in the powder of such microspheres is reduced drastically. This is the key difference between powders of magnetic microspheres and powders of full magnetic spherical particles witch behavior is significantly affected by the dipole-dipole interaction. The magnetic hysteresis in the cobalt microspheres with nonmagnetic core is significantly large then in the full cobalt particles produced using the same technique.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Prishchepa O. O., Shabanov A. V., Zyryanov V. Y.
Заглавие : Director configurations in nematic droplets with inhomogeneous boundary conditions
Место публикации : Phys. Rev. E: AMERICAN PHYSICAL SOC, 2005. - Vol. 72, Is. 3. - Ст.31712. - ISSN 1539-3755, DOI 10.1103/PhysRevE.72.031712
Примечания : Cited References: 22
Предметные рубрики: DISPERSED LIQUID-CRYSTALS
TRANSITION
Ключевые слова (''Своб.индексиров.''): lecithin contents--nematic droplets--polarizers--radial structures--approximation theory--boundary conditions--drop breakup--free energy--polarization--textures--nematic liquid crystals
Аннотация: The nematic droplets with director configurations intermediate between the bipolar and radial structures have been investigated experimentally and theoretically. The liquid crystal 4(')-n-pentyl-4-cyanobiphenyl (5CB) with a variable addition of the lecithin dispersed in polyvinylbutyral has been used. The characteristic textures of the droplets formed at various lecithin contents have been examined using polarizing microscope both in the crossed polarizers and without analyzer. The computer simulation has been performed for proper ordering of the director in spherical nematic droplets by minimizing the free energy in the one-constant approximation. The inhomogeneous boundary conditions with strong anchoring of the molecules at the interface have been used. The distribution of the anchoring angle at the droplet surface has been estimated based on analysis of observed patterns. The simulated textures of the droplets under crossed polarizers are shown to compare well with the experimental ones.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Korshunov M. A., Shabanov A. V., Bukhanov E. R., Shabanov V. F.
Заглавие : Effect of long-period ordering of the structure of a plant on the initial stages of photosynthesis
Место публикации : Dokl. Phys. - 2018. - Vol. 63, Is. 1. - P.1-4. - ISSN 10283358 (ISSN), DOI 10.1134/S1028335818010068
Примечания : Cited References: 15
Ключевые слова (''Своб.индексиров.''): electromagnetic fields--plants (botany)--density of photonic state--long wavelength--photosystems--plant leaves--soft modes--stopband--two bands--water dissociation--transfer matrix method
Аннотация: Using data on the structure of plant leaves, specific features of light propagation in biophotoniccrystal structures have been established by the transfer matrix method. Splitting of the stopband in two bands has been found. The density of photonic states and the electromagnetic field value have been calculated. The occurrence of two photosystems (splitting of the stopband in two bands), the peculiarity of the long-wavelength quantum yield and its enhancement (Emerson effect), and water dissociation in the soft mode due to an increase in the electromagnetic field on the layers are explained.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Flerov I. N., Gorev M. V., Shabanov A. V.
Заглавие : Effect of Sequential Heat Impacts on the Formation of a Stable State of the xLPM-(1-x)PT Multiferroic Composites
Коллективы : Russian Foundation for Basic Research [17-42-240076]; Government of the Krasnoyarsk Territory [17-42-240076]; Krasnoyarsk Territorial Foundation [17-42-240076]
Место публикации : Phys. Solid State. - 2018. - Vol. 60, Is. 12. - P.2524-2531. - ISSN 1063-7834, DOI 10.1134/S1063783419010189. - ISSN 1090-6460(eISSN)
Примечания : Cited References: 15. - This study was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, and the Krasnoyarsk Territorial Foundation for Support of the Scientific and R&D Activity, project no. 17-42-240076 "Complex Approach to Searching and Development of Promising Solid-State Ferroic Cooling Agents Based on the Single- and Multicaloric Effects."
Предметные рубрики: PbTiO3
Аннотация: The effect of thermal cycling and sintering temperature on the chemical and thermodynamic stability of the bulk multiferroic xLa0.7Pb0.3MnO3–(1 – x)PbTiO3 quasi-ceramic and ceramic composites has been experimentally investigated. It is shown that the limiting temperature of the long-term sample firing should not exceed 1070 K. It has been found that sintering at this temperature and/or short-term exposure of the samples at higher temperatures (up to 1220 K) significantly increase the sample compactness, stabilize the thermal expansion, and enhance the quality of the composites. It has been established that the component grain integrity is violated by shrinkage of the samples and a sharp change in their volume during the phase transition of a ferroelectric component.
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20.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Sutormin V. S., Krakhalev M. N., Prishchepa O. O., Gardymova A. P., Shabanov A. V., Kuz’menok N., Bezborodov V., Zyryanov V. Ya.
Заглавие : Electrically controlled anchoring transitions induced by ionic surfactants in liquid crystals
Коллективы : International Liquid Crystal Conference
Место публикации : Abstracts of 27th International Liquid Crystal Conference (ILCC 2018). - 2018. - Ст.2-B1-16
Примечания : Cited References: 3
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