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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stepin E. A., Sushko E. S., Vnukova N. G., Churilov G. N., Rogova A. V., Tomilin F. N., Kudryasheva N. S.
Заглавие : Effects of endohedral Gd-containing fullerenols with a different number of oxygen substituents on bacterial bioluminescence
Колич.характеристики :19 с
Место публикации : Int. J. Mol. Sci. - 2024. - Vol. 25, Is. 2. - Ст.708. - ISSN 16616596 (ISSN), DOI 10.3390/ijms25020708. - ISSN 14220067 (eISSN)
Примечания : Cited References: 102. - This research was funded by the State Assignment of the Ministry of Science and Higher Education of the Russian Federation, project No. 0287-2021-0020, and partly supported by the Russian Science Foundation No. 23-26-10018, Krasnoyarsk Regional Science Foundation
Аннотация: Gadolinium (Gd)-containing fullerenols are perspective agents for magnetic resonance imaging and cancer research. They combine the unique paramagnetic properties of Gd with solubility in water, low toxicity and antiradical activity of fullerenols. We compared the bioeffects of two Gd-containing fullerenols with a different number of oxygen groups—20 and 42: Gd@C82O20H14 and Gd@C82O42H32. The bioluminescent bacteria-based assay was applied to monitor the toxicity of fullerenols, bioluminescence was applied as a signal physiological parameter, and bacterial enzyme-based assay was used to evaluate the fullerenol effects on enzymatic intracellular processes. Chemiluminescence luminol assay was applied to monitor the content of reactive oxygen species (ROS) in bacterial and enzymatic media. It was shown that Gd@C82O42H32 and Gd@C82O20H14 inhibited bacterial bioluminescence at 10?1 and 10?2 gL?1, respectively, revealing a lower toxicity of Gd@C82O42H32. Low-concentration (10?3–10?1 gL?1) bacterial bioluminescence activation by Gd@C82O42H32 was observed, while this activation was not found under exposure to Gd@C82O20H14. Additional carboxyl groups in the structure of Gd@C82O42H32 were determined by infrared spectroscopy and confirmed by quantum chemical calculations. The groups were supposed to endow Gd@C82O42H32 with higher penetration ability through the cellular membrane, activation ability, lower toxicity, balancing of the ROS content in the bacterial suspensions, and lower aggregation in aqueous media.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kirik N., Krylov A. S., Boronin A., Koshcheev S., Solovyov L., Rabchevskii E., Shishkina N., Anshits A.
Заглавие : The relationship between the structural characteristics of α-Fe2O3 catalysts and their lattice oxygen reactivity regarding hydrogen
Место публикации : Materials. - 2023. - Vol. 16, Is. 12: The 15th Anniversary of Materials — Recent Advances in Catalytic Materials. - Ст.4466. - ISSN 19961944 (eISSN), DOI 10.3390/ma16124466
Примечания : Cited References: 63. - This work was conducted within the framework of the budget project for the Institute of Chemistry and Chemical Technology of the Siberian Branch of the Russian Academy of Sciences, Federal Research Center KSC SB RAS, No. FWES–2021–0013
Аннотация: In this paper, the relationship between the structural features of hematite samples calcined in the interval of 800–1100 °C and their reactivity regarding hydrogen studied in the temperature-programmed reaction (TPR-H2) was studied. The oxygen reactivity of the samples decreases with the increasing calcination temperature. The study of calcined hematite samples used X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS), and Raman spectroscopy, and their textural characteristics were studied also. According to XRD results, hematite samples calcined in the temperature range under study are monophase, represented by the α-Fe2O3 phase, in which crystal density increases with increasing calcination temperature. The Raman spectroscopy results also register only the α-Fe2O3 phase; the samples consist of large, well-crystallized particles with smaller particles on their surface, having a significantly lower degree of crystallinity, and their proportion decreases with increasing calcination temperature. XPS results show the α-Fe2O3 surface enriched with Fe2+ ions, whose proportion increases with increasing calcination temperature, which leads to an increase in the lattice oxygen binding energy and a decrease in the α-Fe2O3 reactivity regarding hydrogen.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kicheeva A. G., Sushko E. S., Bondarenko L. S., Kydralieva K. A., Pankratov D. A., Tropskaya N. S., Dzeranov A. A., Dzhardimalieva G. I., Zarrelli M., Kudryasheva N. S.
Заглавие : Functionalized magnetite nanoparticles: Characterization, bioeffects, and role of reactive oxygen species in unicellular and enzymatic systems
Место публикации : Int. J. Mol. Sci. - 2023. - Vol. 24, Is. 2. - Ст.1133. - ISSN 16616596 (ISSN), DOI 10.3390/ijms24021133. - ISSN 14220067 (eISSN)
Примечания : Cited References: 125. - This research was funded by Russian Science Foundation, N 22-73-10222
Аннотация: The current study evaluates the role of reactive oxygen species (ROS) in bioeffects of magnetite nanoparticles (MNPs), such as bare (Fe3O4), humic acids (Fe3O4-HA), and 3-aminopropyltriethoxysilane (Fe3O4-APTES) modified MNPs. Mössbauer spectroscopy was used to identify the local surrounding for Fe atom/ions and the depth of modification for MNPs. It was found that the Fe3O4-HA MNPs contain the smallest, whereas the Fe3O4-APTES MNPs contain the largest amount of Fe2+ ions. Bioluminescent cellular and enzymatic assays were applied to monitor the toxicity and anti-(pro-)oxidant activity of MNPs. The contents of ROS were determined by a chemiluminescence luminol assay evaluating the correlations with toxicity/anti-(pro-)oxidant coefficients. Toxic effects of modified MNPs were found at higher concentrations (10−2 g/L); they were related to ROS storage in bacterial suspensions. MNPs stimulated ROS production by the bacteria in a wide concentration range (10−15–1 g/L). Under the conditions of model oxidative stress and higher concentrations of MNPs (10−4 g/L), the bacterial bioassay revealed prooxidant activity of all three MNP types, with corresponding decay of ROS content. Bioluminescence enzymatic assay did not show any sensitivity to MNPs, with negligible change in ROS content. The results clearly indicate that cell-membrane processes are responsible for the bioeffects and bacterial ROS generation, confirming the ferroptosis phenomenon based on iron-initiated cell-membrane lipid peroxidation.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Васильева, Наталья Дмитриевна, Софронова, Светлана Николаевна, Баринов В. В., Тайник А. В., Трушкина Т. В., Чуракова О. В.
Заглавие : Применение процессного моделирования для интерпретации вариации стабильных изотопов в годичных кольцах деревьев
Колич.характеристики :16 с
Коллективы : РусДендро-2023, Международная дендрохронологическая конференция
Место публикации : Лесотехнич. журн. - 2023. - Т. 13, № 4, Ч. 2. - С. 23-38. - ISSN 22227962 (ISSN), DOI 10.34220/issn.2222-7962/2023.4/15; Forest. Eng. J.
Примечания : Библиогр.: 33. - Исследование выполнено за счет гранта Российского научного фонда № 21-17-00006, (https://rscf.ru/en/project/21-17-00006/)
Аннотация: Ширина годичных колец деревьев и изотопный состав стабильных изотопов углерода (δ13C), кислорода (δ18O) и водорода (δ2H) в целлюлозе годичных колец широко используются для реконструкций условий окружающей среды. Применение моделей, способных описать вариацию стабильных изотопов в годичных кольцах деревьев, представляет собой набор инструментов для интерпретации изменений окружающей среды на экофизиологическом уровне. В данной работе хронологии с погодичным временным разрешением, полученные по стабильным изотопам δ13С, δ18O и δ2H в целлюлозе годичных колец хвойных для региона Дельта реки Маккензи в Канаде (68° 30′ с.ш., 133° 48′ з.д.) для периода с 1901 по 2009 гг., были сопоставлены с модельными расчетами для интерпретации экофизиологического сигнала. При помощи процессной модели (LPX) нам удалось смоделировать δ13С вариацию, значимо коррелирующую с измеренными данными (r = 0.29; p = 0.002) для периода с 1901 по 2009 гг. Модельные расчеты по кислороду и водороду требуют дальнейшего преобразования модельных блоков, в частности, требуют доработки включения источника воды, используемой деревьями, блока оттаивания и промерзания почвы с учетом вечной мерзлоты, а также экспериментальных данных по содержанию δ18O и δ2H в воде.Tree-ring width and stable isotopes (carbon, oxygen, and hydrogen) in tree-ring cellulose are widely used to reconstruct environmental conditions. The application of models capable to describe a variation of stable isotopes in annual tree rings can be a powerful tool for interpretation of environmental changes at the eco-physiological level. In this paper, we modelled carbon (δ13С), oxygen (δ18O), and hydrogen (δ2H) variations at the tree-ring level and compared results with measured data, obtained from the Mackenzie Delta River (68°30′ N, 133°48′ W) for the common period from 1901 to 2009. Using a process-based model (LPX), we were able to simulate carbon isotope values, which significantly (r = 0.29; p = 0.002) correlate with measured carbon isotope values. The model calculations for oxygen and hydrogen require further modifications and improvements, in particular the inclusion of the source of water used by the trees in the Canadian subarctic, as well as δ18O and δ2H in the water.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Sushko E. S., Sachkova A. S., Внукова, Наталья Григорьевна, Чурилов, Григорий Николаевич, Stepin E. A., Kicheeva A. G., Kudryasheva N. S.
Заглавие : Biological activity of fullerenols of various structure. The role of reactive oxygen species. Bioluminescent monitoring
Коллективы : Congress of Biophysicists of Russia
Место публикации : Biophysical reviews: 7th Congress of Biophysicists of Russia : conference proceedings. - 2023. - Vol. 15, Is. 5. - Ст.S7.437. - P.1663. - DOI 10.1007/s12551-023-01150-w
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dudnikov V. A., Vereshchagin S. N., Solov’ev L. A., Gavrilkin S. Y., Tsvetkov A. Y., Sitnikov M. V., Orlov Yu. S.
Заглавие : Structure of metastable Sr0.8Dy0.2Co3-δ phases and their electrical and magnetic properties
Место публикации : J. Exp. Theor. Phys. - 2022. - Vol. 134, Is. 3. - P.290-299. - ISSN 10637761 (ISSN), DOI 10.1134/S1063776122030037
Примечания : Cited References: 40. - Investigation was supported by the Russian Foundation for Basic Research (grant no. 19-03-00017). Thermal and X-ray diffraction studies were conducted in the framework of State Task 0287-2021-0013 for the Institute of Chemistry and Chemical Technologies, Siberian Branch, Russian Academy of Sciences
Аннотация: Polycrystalline Sr0.8Dy0.2Co3-δ complex cobalt oxides with a different amount of oxygen (δ = 0.26, 0.44, 0.46) have been prepared by solid-state synthesis. An increase in oxygen deficiency causes the brownmillerite phase to appear in the perovskite structure, which significantly changes its properties. At δ = 0.46, the content of the brownmillerite phase reaches 38%. A comparative analysis of the magnetic and transport properties of synthesized samples has been carried out. The asymptotic Curie temperature changes sign from positive at δ = 0.26 to negative at δ = 0.46. The magnetoresistance of the sample with δ = 0.46 is negative and exceeds 40% at T = 10 K. The temperature dependence of resistivity is characteristic of semiconductors, and the absolute values for samples at low temperatures differ almost tenfold.
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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) : Padamata, Sai Krishna, Yasinskiy, Andrey, Shabanov A. V., Bermeshev, Timofey, Yang, You-jian, Wang, Zhao-wen, Cao, Dao, Polyakov, Peter
Заглавие : Improving corrosion resistance of Cu-Al-based anodes in KF-AlF3-Al2O3 melts
Коллективы : State Assignment for the Science of Siberian Federal University, Russia [FSRZ-2020-0013]
Место публикации : Trans. Nonferrous Met. Soc. China. - 2022. - Vol. 32, Is. 1. - P.354-363. - ISSN 1003-6326, DOI 10.1016/S1003-6326(22)65800-X. - ISSN 2210-3384(eISSN)
Примечания : Cited References: 24. - The work is performed as a part of the State Assignment for the Science of Siberian Federal University, Russia (No. FSRZ-2020-0013) . Use of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center "Krasnoyarsk Science Center SB RAS" is acknowledged
Предметные рубрики: NI-FE
ALUMINUM ELECTROLYSIS
INERT ANODES
NICKEL FERRITE
BEHAVIOR
Аннотация: The anodic behaviour of pre-oxidised and non-oxidised Cu−Al-based anodes (Cu−10Al and Cu−9.8Al−2Mn) in KF−AlF3−Al2O3 melts was studied through galvanostatic and potentiodynamic polarization techniques. The alloy compositions were oxidised for a short-term (8 h) at 700 °C, followed by galvanostatic polarization for 1 h at 800 °C with an applied current density of 0.4 A/cm2. The potentiodynamic curves were recorded with a sweep rate of 0.01 V/s. XRD analysis was conducted on frozen melt samples collected on the surface of the anode, and SEM observation was performed on the anode after the experiment to study the phases of the scales formed on the alloys. All the anode materials had a steady potential between 2.30 and 2.50 V(vs Al/AlF3). The corrosion rates of the anodes were calculated from the data acquired through potentiodynamic polarization. It was seen that pre-oxidised anodes possess a low corrosion rate compared to those without pre-oxidation treatment.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Aplesnin S. S., Udod L. V., Sitnikov M. N., Velikanov D. A., Romanova O. B.
Заглавие : Ferromagnetism induced by oxygen vacancies in mullite Bi2Fe4O9
Коллективы : Российская академия наук, Физико-технический институт им. Е.К. Завойского ФИЦ Казанского научного центра РАН, Казанский (Приволжский) федеральный университет, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : VIII Euro-Asian symposium "Trends in magnetism" (EASTMAG-2022): Book of abstracts/ program com. S. G. Ovchinnikov [et al.]. - 2022. - Vol. 1, Sect.: Low dimensional magnetism. - Ст.C.O1. - P.327-328. - ISBN 978-5-94469-051-7
Примечания : Cited References: 3
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Udod L. V., Sitnikov M. N., Velikanov D. A., Molokeev M. S., Romanova O. B., Shabanov A. V.
Заглавие : Enhancement of ferromagnetism and ferroelectricity by oxygen vacancies in mullite Bi2Fe4O9 in the Bi2(Sn0.7Fe0.3)2O7-x matrix
Место публикации : J. Magn. Magn. Mater. - 2022. - Vol. 559. - Ст.169530. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2022.169530
Примечания : Cited References: 47
Аннотация: A new bismuth pyrostannate-based composite Bi2(Sn0.7Fe0.3)2O7-x/Bi2Fe4O9 (BSFO/BFO) has been obtained by the solid-state synthesis. Temperature dependences of the magnetic hysteresis and remanent magnetization and the nonlinear field dependence of the magnetization for the Bi2Fe4O9 antiferromagnet have been established. A temperature of the formation of canted sublattices in the antiferromagnet with the occurrence of a spontaneous moment in mullite has been determined. The mechanism of the electric polarization hysteresis and the temperature dependence of the remanent polarization have been established. It has been shown, that, below the Néel temperature, the dipole polarization is induced by a lone electron pair of bismuth ions. At T TN, the migration polarization is caused by the charge carrier density at the chemical potential. A significant increase in the remanent magnetization of mullite in the bismuth pyrostannate matrix with oxygen vacancies over a value typical of polycrystalline mullite has been established. Remanent magnetization is explained in terms of ferron model.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sushko E. S., Vnukova N. G., Churilov G. N., Kudryasheva N. S.
Заглавие : Endohedral Gd-containing fullerenol: Toxicity, antioxidant activity and regulation of reactive oxygen species in cellular and enzymatic systems
Место публикации : Int. J. Mol. Sci. - 2022. - Vol. 23, Is. 9. - Ст.5152. - ISSN 16616596 (ISSN), DOI 10.3390/ijms23095152
Примечания : Cited References: 117. - This research was funded by Russian Foundation for Basic Research, N18-29-19003; Russian Foundation for Basic Research, 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 (Russia)
Аннотация: The Gd-containing metallofullerene derivatives are perspective magnetic resonance imaging contrast agents. We studied the bioeffects of a water-soluble fullerene derivative, gadolinium-endohedral fullerenol, with 40–42 oxygen groups (Gd@Fln). Bioluminescent cellular and enzymatic assays were applied to monitor toxicity and antioxidant activity of Gd@Fln in model solutions; bioluminescence was applied as a signaling physiological parameter. The Gd@Fln inhibited bioluminescence at high concentrations (2·10−1 gL−1), revealing lower toxicity as compared to the previously studied fullerenols. Efficient activation of bioluminescence (up to almost 100%) and consumption of reactive oxygen species (ROS) in bacterial suspension were observed under low-concentration exposure to Gd@Fln (10−3–2·10−1 gL−1). Antioxidant capability of Gd@Fln was studied under conditions of model oxidative stress (i.e., solutions of model organic and inorganic oxidizers); antioxidant coefficients of Gd@Fln were determined at different concentrations and times of exposure. Contents of ROS were evaluated and correlations with toxicity/antioxidant coefficients were determined. The bioeffects of Gd@Fln were explained by hydrophobic interactions, electron affinity, and disturbing of ROS balance in the bioluminescence systems. The results contribute to understanding the molecular mechanism of “hormetic” cellular responses. Advantages of the bioluminescence assays to compare bioeffects of fullerenols based on their structural characteristics were demonstrated.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Orlov Yu. S., Nikolaev S. V., Nesterov A. I., Ovchinnikov S. G.
Заглавие : Light-induced ultrafast dynamics of spin crossovers under high pressure
Место публикации : J. Exp. Theor. Phys. - 2021. - Vol. 132, Is. 3. - P.399-415. - ISSN 10637761 (ISSN), DOI 10.1134/S1063776121030079
Примечания : Cited References: 71. - The authors thank the Russian Scientific Foundation for the financial support under the grant 18-12-00022
Аннотация: Within the multielectron model of magnetic insulator with two different spin terms at each cation and spin crossover under high pressure we have studied dynamics of a sudden excited non equilibrium spin state. We obtain the different relaxation of the magnetization, high spin/low spin occupation numbers, and the metal-oxygen bond length for different values of the external pressure. For each pressure-temperature values stationary state agrees to the mean field phase diagrams. We found the long living oscillations of magnetization for the high spin ground state at small pressure. Close to crossover pressure the smooth relaxation is accompanied with a set of sharp strongly non linear oscillations of magnetization and HS/LS occupation numbers that are accompanied by the Franck–Condon resonances.
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13.

Вид документа : Статья из журнала
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Автор(ы) : Shubin A. A., Kovalskii V. Y., Ruzankin S. P., Zilberberg I. L., Parmon V. N., Tomilin F. N., Avramov P. V.
Заглавие : The FeIV-O• oxyl unit as a key intermediate in water oxidation on the FeIII-hydroxide: DFT predictions
Место публикации : Int. J. Quantum Chem. - 2021. - Vol. 121, Is. 10. - Ст.e26610. - ISSN 00207608 (ISSN), DOI 10.1002/qua.26610
Примечания : Cited References: 21. - Aleksandr A. Shubin, Igor L. Zilberberg, and Valentin N. Parmon acknowledge the support of Russian Foundation for Basic Research under grant No. 15-29-01275. Viktor Yu. Kovalskii acknowledges the support of Russian Foundation for Basic Research under grant No. 18-33-00932. Calculations have been performed at the Siberian Supercomputer Centre SB RAS
Аннотация: The O-O coupling process in water oxidation on the gamma FeOOH hydroxide catalyst is simulated by means of density functional theory using model iron cubane cluster Fe4O4(OH)4. A key reactive intermediate is proposed to be the HO-FeIV-O• oxyl unit with terminal oxo radical. The “initial” vertex FeIII(OH) moiety forms this intermediate at the calculated overpotential of 0.93 V by adding one water molecule and withdrawing two proton–electron pairs. The O-O coupling goes via water nucleophilic attack on the oxyl oxygen to form the O-O bond with a remarkably low barrier of 11 kcal/mol. This process is far more effective than alternative scenario based on direct interaction of two ferryl FeIV-O sites (with estimated barrier of 36 kcal/mol) and is comparable with the coupling between terminal oxo center and three-coordinated lattice oxo center (12 kcal/mol barrier). The process of hydroxylation of terminal oxygen inhibits the O-O coupling. Nevertheless, being more effective for ferryl oxygen, the hydroxylation in fact enhances selectivity of the O-O coupling initiated by the oxyl oxygen.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vereshchagin S., Dudnikov V. A., Orlov Yu. S., Solovyov L.
Заглавие : Tetragonal to cubic transition of Sr0.8Dy0.2CoO3-δ and oxygen mobility: TG-DSC-XRD study
Место публикации : J. Alloys Compd. - 2021. - Vol. 860. - Ст.158257. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2020.158257
Примечания : Cited References: 35. - This work was conducted within the framework of the budget project (Project No. АААА-А17-117021310222-4) for Institute of Chemistry and Chemical Technology SB RAS using the equipment of Krasnoyarsk Regional Research Equipment Centre of SB RAS and in part was funded by Russian Foundation for Basic Research (projects 19-03-00017), RFBR and BRFBR (project 18-52-00017), Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science (project 18-42-243004)
Аннотация: Processes of ordering (d-o) and disordering (o-d) of Sr2+/Dy3+ cations in a single-phase Sr0.8Dy0.2CoO3-δ was investigated by TG-DSC and XRD as a function of heating/cooling rate (β = 2,10,20,50,99 K min−1 and ~50 K/s) in 20% O2-Ar flow. According to DSC data the interconversion of disordered cubic (c) and ordered tetragonal (t) structure appears at 1276–1328 K as a first-order phase transition; the temperature and enthalpy of o-d transformation have only slight dependence on β whereas the characteristics of reversed d-o process vary greatly with cooling rate. XRD powder patterns of all samples showed no indications of a simultaneous presence of c+t domains, pointing to a single phase composition (c or t). It was suggested that the observed behavior is a consequence of two simultaneous interconnected processes of A-sublattice melting and cation/ (anion vacancy) ordering. A rarely used novel TG-DSC method based on variable gas phase composition was utilized to study properties of mobile oxygen over Sr0.8Dy0.2CoO3-δ samples. It was shown that the appearance of tetragonal phase reduces both oxygen mobility and its bonding energy, the latter decreasing substantially only at high degree of Sr2+/Dy3+ ordering.
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15.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Churilov G. N., Glushenko G. A., Tomashevich Ye. V., Nikolaev N. S., Vnukova N. G.
Заглавие : The role of oxygen in the formation of a continual metal shell strongly bonded to the carbon surface
Коллективы : "Functional materials", International conference, Крымский федеральный университет имени В.И. Вернадского
Место публикации : Ovchinnikov S. G. "Functional materials", International conference (2021 ; Oct. 4-8 ; Alushta, Russia) International conference "Functional materials": book of abstracts/ ed. V. N. Berzhansky ; org. com. S. G. Ovchinnikov [et al.]. - Simferopol, 2021. - P.244-245
Примечания : Библиогр.: 3
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kovel E. S., Kicheeva A. G., Vnukova N. G., Churilov G. N., Stepin E. A., Kudryasheva N. S.
Заглавие : Toxicity and antioxidant activity of fullerenol C60,70 with low number of oxygen substituents
Место публикации : Int. J. Mol. Sci. - 2021. - Vol. 22, Is. 12. - Ст.6382. - ISSN 16616596 (ISSN), DOI 10.3390/ijms22126382
Примечания : Cited References: 93. - 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: Fullerene is a nanosized carbon structure with potential drug delivery applications. We studied the bioeffects of a water-soluble fullerene derivative, fullerenol, with 10-12 oxygen groups (F10-12); its structure was characterized by IR and XPS spectroscopy. A bioluminescent enzyme system was used to study toxic and antioxidant effects of F10-12 at the enzymatic level. Antioxidant characteristics of F10-12 were revealed in model solutions of organic and inorganic oxidizers. Low-concentration activation of bioluminescence was validated statistically in oxidizer solutions. Toxic and antioxidant characteristics of F10-12 were compared to those of homologous fullerenols with a higher number of oxygen groups:F24-28 and F40-42. No simple dependency was found between the toxic/antioxidant characteristics and the number of oxygen groups on the fullerene’s carbon cage. Lower toxicity and higher antioxidant activity of F24-28 were identified and presumptively attributed to its higher solubility. An active role of reactive oxygen species (ROS) in the bioeffects of F10-12 was demonstrated. Correlations between toxic/antioxidant characteristics of F10-12 and ROS content were evaluated. Toxic and antioxidant effects were related to the decrease in ROS content in the enzyme solutions. Our results reveal a complexity of ROS effects in the enzymatic assay system.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shakirova A. A., Tomilin F. N., Pomogaev V. A., Vnukova N. G., Churilov G. N., Kudryasheva N. S., Tchaikovskaya O. N., Ovchinnikov S. G., Avramov P. V.
Заглавие : Synthesis, mass spectroscopy detection, and density functional theory investigations of the Gd endohedral complexes of C82 fullerenols
Коллективы : RFBRRussian Foundation for Basic Research (RFBR) [18-29-19003 MK]; Russian Ministry of Science and EducationMinistry of Education and Science, Russian Federation [0721-2020-0033]; Collaborative NRF-RFBR grant (Korean) [NRF-2019K2A9A1A06100125]; Collaborative NRF-RFBR grant (Russian) [19-53-51005 NIFa RFFI-Korea]; NRF [2021R1A2C1010455]
Место публикации : Computation. - 2021. - Vol. 9, Is. 5. - Ст.58. - ISSN 2079-3197(eISSN), DOI 10.3390/computation9050058
Примечания : Cited References: 41. - The experimental results were funded by RFBR project No. 18-29-19003 MK. The quantum chemical study was funded by project 0721-2020-0033 of the Russian Ministry of Science and Education. The collaboration and coordination of Russian and Korean teams was supported by Collaborative NRF-RFBR grant (Korean ID: NRF-2019K2A9A1A06100125; Russian ID: Project No. 19-53-51005 NIFa RFFI-Korea) and NRF 2021R1A2C1010455 grant
Предметные рубрики: ZETA VALENCE QUALITY
BIOLOGICAL-ACTIVITY
BASIS-SETS
TOXICITY
Аннотация: Gd endohedral complexes of C82 fullerenols were synthesized and mass spectrometry analysis of their composition was carried out. It was established that the synthesis yields a series of fullerenols Gd@C82Ox(OH)y (x = 0, 3; y = 8, 16, 24, 36, 44). The atomic and electronic structure and properties of the synthesized fullerenols were investigated using the density functional theory calculations. It was shown that the presence of endohedral gadolinium increases the reactivity of fullerenols. It is proposed that the high-spin endohedral fullerenols are promising candidates for application in magnetic resonance imaging.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dudnikov V. A., Orlov Yu. S., Bushinsky M. V., Solovyov L. A., Vereshchagin S. N., Gavrilkin, S. Yu, Tsvetkov, A. Yu, Gorev M. V., Novikov S. V., Mantytskaya O. S., Ovchinnikov S. G.
Заглавие : Structural, magnetic, electronic, and dilatation properties of the ordered solid solutions Ln0.2Sr0.8CoO3-δ (Ln = Sm, Gd, Dy) with the same oxygen nonstoichiometry index δ
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-03-00017]; RFBRRussian Foundation for Basic Research (RFBR) [18-52-00017, F18R-119]; BRFFR [18-52-00017, F18R-119]; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory [18-42-243004, SB RAS V.45.3.3]
Место публикации : J. Alloy. Compd. - 2020. - Vol. 830. - Ст.154629. - ISSN 0925-8388, DOI 10.1016/j.jallcom.2020.154629. - ISSN 1873-4669(eISSN)
Примечания : Cited References: 44. - The work was financially supported by Russian Foundation for Basic Research (grant No. 19-03-00017); RFBR and BRFFR as a part of scientific project No. 18-52-00017 and project F18R-119; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project: "New thermoelectric materials based on multi-scale spatially inhomogeneous substituted rare-earth cobalt oxides and the Ruddlesden-Popper phases " project No. 18-42-243004, Project of Basic Research SB RAS V.45.3.3.
Предметные рубрики: LN(1-X)SR(X)COO(3-DELTA) LN
COBALTATE PEROVSKITES
Аннотация: Single-phase samples of the layered perovskite-like cobalt oxides Ln0.2Sr0.8CoO3-δ (Ln = Sm, Gd, Dy) with the same oxygen nonstoichiometry index δ = 0.37 ± 0.01 were synthesized. All samples are characterized by a tetragonal unit cell with the space group I4/mmm. The structural, magnetic, electric transport and dilatation properties of the obtained samples are investigated. The studied samples are characterized by two anomalies in magnetic properties, a high-temperature maximum near Тm = 350 К with magnetic field hysteresis below Tm, and a diffuse peak in the intermediate temperature range, which shifts with ionic radius decrease of the rare-earth element to higher temperatures. The high-temperature maxima of the magnetic susceptibility correlate with anomalies in thermal expansion, heat capacity and the features in the temperature dependences of the electrical resistivity, pointing to a strong relationship between the structural, magnetic and electronic degrees of freedom. The given comparative analysis of the experimental data of various substituting rare-earth elements with the same oxygen nonstoichiometry has been carried out for the first time.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisenko, Yu. G., Sal'nikova E. I., Basova S. A., Molokeev M. S., Krylov A. S., Aleksandrovsky A. S., Oreshonkov A. S., Atuchin V. V., Volkova S. S., Khritokhin N. A., Andreev O. V.
Заглавие : Synthesis of samarium oxysulfate Sm2O2SO4 in the high-temperature oxidation reaction and its structural, thermal and luminescent properties
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-02-00754, 18-32-20011]; Russian Science FoundationRussian Science Foundation (RSF) [19-42-02003]
Место публикации : Molecules. - 2020. - Vol. 25, Is. 6. - Ст.1330. - ISSN 1420-3049(eISSN), DOI 10.3390/molecules25061330
Примечания : Cited References: 56. - This research was funded by the Russian Foundation for Basic Research (Grants 18-02-00754, 18-32-20011) and Russian Science Foundation (project 19-42-02003).
Предметные рубрики: RARE-EARTH SULFATES
SPECTROSCOPIC PROPERTIES
OXYGEN-STORAGE
LN
LA
Аннотация: The oxidation process of samariumoxysulfide was studied in the temperature range of 500–1000 °C. Our DTA investigation allowed for establishing the main thermodynamic (∆Hºexp = −654.6 kJ/mol) and kinetic characteristics of the process (Ea = 244 kJ/mol, A = 2 × 1010). The enthalpy value of samarium oxysulfate (ΔHºf (Sm2O2SO4(monocl)) = −2294.0 kJ/mol) formation was calculated. The calculated process enthalpy value coincides with the value determined in the experiment. It was established that samarium oxysulfate crystallizes in the monoclinic symmetry class and its crystal structure belongs to space group C2/c with unit cell parameters a = 13.7442 (2), b = 4.20178 (4) and c = 8.16711 (8)Å, β = 107.224 (1)°, V = 450.498 (9)Å3, Z = 4. The main elements of the crystalline structure are obtained and the cation coordination environment is analyzed in detail. Vibrational spectroscopy methods confirmed the structural model adequacy. The Sm2O2SO4 luminescence spectra exhibit three main bands easily assignable to the transitions from 4G5/2 state to 6H5/2, 6H7/2, and 6H9/2 multiplets.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kremneva A. M., Fedorov A. V., Bulavchenko O. A., Knyazev Yu. V., Saraev A. A., Yakovlev V. A., Kaichev V. V.
Заглавие : Effect of calcination temperature on activity of Fe2O3-Al2O3 nanocomposite catalysts in CO oxidation
Коллективы : Russian Science FoundationRussian Science Foundation (RSF) [17-73-20157]; National center of investigation of catalysts" at Boreskov Institute of Catalysis
Место публикации : Catal. Lett. - 2020. - Vol. 150. - P.3377-3385. - ISSN 1011-372X, DOI 10.1007/s10562-020-03250-8. - ISSN 1572-879X(eISSN)
Примечания : Cited References: 31. - This work was supported by the Russian Science Foundation (Grant No. 17-73-20157). The experiments were performed using facilities of the shared research center "National center of investigation of catalysts" at Boreskov Institute of Catalysis. The authors thank A.Yu. Gladky for the TPR measurements and Z.S. Vinokurov for the XRD measurements.
Предметные рубрики: MOSSBAUER
SPECTROSCOPY
CHEMISTRY
IRON
XPS
ADSORPTION
OXYGEN
FE
Аннотация: Nanocomposite Fe–Al oxide catalysts were prepared by the melting of iron and aluminum nitrates with the subsequent calcination in air at different temperatures. It was found that the catalysts calcined at 450 °C are more active in the oxidation of CO than the catalysts calcined at 700 °C. X-ray diffraction and X-ray photoelectron spectroscopy showed that all the catalysts consist of hematite, α-Fe2O3 nanoparticles, and Al2O3 in an amorphous state. Iron oxide is the active component, which provides the oxidation of CO, while alumina is a texture promoter. The increase in the calcination temperature leads to a minor increase in the average size of hematite nanoparticles and an insignificant decrease in the specific surface area. Kinetic measurements showed that the oxidation of CO over the Fe–Al catalysts calcined at 450 and 700 °C proceeds with the activation energy of 61–69 and 91 kJ/mol, respectively. This means that the low-temperature and high-temperature catalysts contain different active species. Temperature-programmed reduction with CO indicated that the decrease in the calcination temperature improves the reducibility of the Fe-Al nanocomposites. According to 57Fe Mössbauer spectroscopy, the low-temperature catalysts contain hydrated iron oxides (acagenite and ferrihydrite) and a significant amount of highly defective hematite, which is absent in the high-temperature catalyst. These species can provide the enhanced activity of the low-temperature catalysts in the oxidation of CO.
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