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1.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zinenko V. I., Pavlovsky M. S.
Заглавие : Lattice dynamics of BiFeO3 under hydrostatic pressure
Коллективы : Russia/CIS/Baltic/Japan Symposium on Ferroelectricity
Место публикации : 9th Russai/CIS/Baltic/Japan symposium on ferroelectricity: abstracts book : June 15-19, 2008, Vilnius, Lithuania. - p.137
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2.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zhandun V. S., Zamkova N. G., Zinenko V. I.
Заглавие : The lattice dynamics, ferroelectric and antiferroelectric instability and ferroelectric phase transition in disorder solid solutions PbB’1/2B”1/2O3 (B’ = Ga, In, Lu; B” = Nb, Ta)
Коллективы : Russia/CIS/Baltic/Japan Symposium on Ferroelectricity
Место публикации : 9th Russai/CIS/Baltic/Japan symposium on ferroelectricity: abstracts book : June 15-19, 2008, Vilnius, Lithuania. - p.32
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3.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Orlov Yu. S., Nikolaev S. V., Paklin N. N.
Заглавие : Photoinduced nonlinear dynamics of strongly correlated systems with spin crossover: Autocatalytic spin transition
Колич.характеристики :6 с
Место публикации : JETP Lett. - 2024. - Vol. 119, Is. 3. - P.227-232. - ISSN 00213640 (ISSN), DOI 10.1134/S0021364023603962. - ISSN 10906487 (eISSN)
Примечания : Cited References: 25. - This work was supported by the Russian Science Foundation (project no. 22-22-20007) and by the Krasnoyarsk Regional Science Foundation (project "Nonlinear Dynamics and Photoinduced Dynamic Phase Transitions in Strongly Correlated Systems with Spin Crossover")
Аннотация: Nonlinear phenomena similar to the Belousov–Zhabotinsky reaction (autocatalytic oscillations of the population of high-spin and low-spin multielectron states of a transition metal ion) in open systems with spin crossover near bistability are considered. The conditions for possible experimental observation of autocatalytic oscillations of the magnetization in magnetically ordered systems with spin crossover are analyzed.
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4.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Solovev P. N., Belyaev B. A., Boev N. M., Skomorokhov G. V., Izotov A. V.
Заглавие : Magnetic anisotropy and ferromagnetic resonance in inhomogeneous demagnetizing fields near edges of thin magnetic films
Колич.характеристики :12 с
Место публикации : J. Phys. Condens. Matter. - 2024. - Vol. 36, Is. 19. - Ст.195803. - ISSN 09538984 (ISSN), DOI 10.1088/1361-648X/ad258c. - ISSN 1361648X (eISSN)
Примечания : Cited References: 38
Аннотация: Using local ferromagnetic resonance spectroscopy, we have studied the magnetic properties near edges of thin tangentially magnetized permalloy films, in which a well-defined uniaxial magnetic anisotropy was induced perpendicular to one of the edges. In the experiment, two samples with thicknesses of 90 and 300 nm and with slightly different compositions were examined. To explain the magnetization dynamics near edges, we propose a simple yet effective model of a film in the form of a rectangular prism, which yields the modified Kittel formula for the resonance frequency. In this formula, the locally averaged distance-dependent demagnetizing field that emerges near the edges is included as an additional uniaxial anisotropy term. The measurements reveal that at a certain distance from the edge, the resulting (apparent) anisotropy, determined from the angular dependencies of the resonance field, almost vanishes. Moreover, its easy axis reorients to become parallel to the edge. The model predictions agree well with these results, proving that the main resonance mode behavior near the film edges can be accurately described by introducing additional effective uniaxial anisotropy, provided the measuring area is relatively large. However, for the thick (300 nm) sample, additional precession modes are also observed. These modes distort the angular dependence of the main mode, thus demonstrating the limitations of the model.
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5.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Morozov E. V., Trukhan, Sergey N., Kozhevnikov, Ivan V., Peterson, Ivan V., Martyanov, Oleg N.
Заглавие : Dynamics of asphaltene aggregates under high-pressure CO2 revealed by pulsed-field gradient NMR
Колич.характеристики :12 с
Место публикации : Energy & Fuels. - 2023. - Vol. 37, Is. 22. - P.17215-17226. - ISSN 08870624 (ISSN), DOI 10.1021/acs.energyfuels.3c02862. - ISSN 15205029 (eISSN)
Примечания : Cited References: 90. - The present research was performed with the financial support of the Russian Science Foundation (project no. 21-13-00171, http://rscf.ru/project/21-13-00171/) using the equipment of the Krasnoyarsk Regional Center of Research Equipment of the Federal Research Center “Krasnoyarsk Science Center SB RAS”
Аннотация: The work demonstrates the results of the first experimental PFG NMR study in situ of the complex phase behavior of asphaltenes in the presence of high-pressure CO2. To perform the experiments, a series of sealed, thick-walled quartz capillaries were prepared with a mixture of CO2 and asphaltenes dissolved either in chloroform or benzene at different initial concentrations. Then, the temperature dependence of the diffusion coefficients of the asphaltene aggregates was measured for each sample after the mixture reached its equilibrium state, at which, in accordance with the solubility limit, only part of the initial asphaltenes remained dissolved. Despite quite low residual asphaltene concentrations in solution, experimental data clearly demonstrated the presence of aggregated structures (up to 70–80 wt %) attributed solely to nanoaggregates, with no signs of the presence of macroaggregates in the samples. Temperature dependencies of aggregate diffusivity clearly showed that the scenario, according to which the evolution of the asphaltene aggregates will develop, strongly depends on the initial asphaltene concentration, mass fraction of CO2 loaded into the system, and chemical nature of the solvent used. In particular, the most diluted asphaltene solution, expected to be the most resistive to the aggregation processes in a high-pressure CO2 environment, revealed the most pronounced aggregation-dependent translational dynamics as compared to those with a moderate initial asphaltene concentration. Contrarily, the concentrated asphaltene solution may not show drastic aggregation processes if the mass fraction of the CO2 loaded will not appear to be so high. Finally, the experimental results provide evidence that the temperature-triggered structural transformation of asphaltene aggregates due to the noncovalent bond breakup is not hindered under high-pressure CO2, but instead becomes more emphasized. The results obtained shed new light on asphaltene aggregate dynamics and brought new knowledge about the fundamental behavior of asphaltene in high-pressure CO2 conditions.
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6.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Дымова М. А., Кулигина Е. В., Рихтер В. А., Артюшенко П. В., Рогова А. В., Щугорева И. А., Томилин, Феликс Николаевич, Кичкайло А. С., Замай Т. Н.
Заглавие : Получение высокоселективных аптамеров к онколитическому вирусу VV-GMCSF-Lact. Теоретические и экспериментальные подходы
Колич.характеристики :7 с
Место публикации : Сиб. мед. обозрение. - 2023. - № 5. - С. 95-101. - ISSN 18199496 (ISSN), DOI 10.20333/25000136-2023-5-95-101; Sib. Med. Rev. - ISSN 25000136 (eISSN)
Примечания : Библиогр.: 21. - Исследование выполнено за счет гранта Российского научного фонда № 22-64-00041, https://rscf.ru/project/22-64-00041/. Работа также поддержана в рамках государственного задания ИХБФМ СО РАН No121030200173-6 (наработка вируса). Авторы благодарят Межведомственный суперкомпьютерный центр Российской академии наук (МСЦ РАН) за предоставление вычислительных мощностей
Аннотация: Введение. Деструкция злокачественных опухолей с помощью онколитических вирусов – один из наиболее эффективных и безопасных способов противоопухолевой терапии. Для получения доступа к опухолевым клеткам вирус должен длительное время циркулировать в кровотоке, избегая действия иммунной системы. Однако при введении вируса в организм он провоцирует выработку вируснейтрализующих антител, снижающих его противоопухолевый эффект. Наиболее эффективным способом защиты вируса от нейтрализующих антител является его экранирование, в частности, с помощью селективных к нему ДНК-аптамеров. Цель исследования. С помощью экспериментальных методов и теоретических расчётов разработать подходящие для создания противоопухолевого препарата на основе онколитического вируса VV-GMCSF-Lact ДНК-аптамеры, эффективно экранирующие вирусы и способные защитить их от вируснейтрализующих антител. Материал и методы. Моделирование вторичных структур аптамеров выполнено в программе для фолдинга нуклеиновых кислот mFold, моделирование соответствующих пространственных полноатомных структур аптамеров – в программах SimRNA и VMD. Расчёты молекулярной динамики проведены в программном пакете GROMACS 2018.8. Кластерный анализ полученных молекулярно-динамических траекторий выполнен в программе VMD. Оценка связывания Cy5-модифицированных аптамеров с вирусом проведена с помощью проточной цитометрии на цитофлуориметре BD FACSCanto II (Becton Dickinson, г. Франклин Лейкс, Нью-Джерси, США). Результаты. Модификация аптамеров, экспериментально полученных с помощью технологии SELEX, позволила получить пять укороченных олигонуклеотидов NV1t_72, NV4t_64, NV4t_53, NV14t_41 и NV14t_57, экранирующих онколитический вирус VV-GMCSF-Lact, самым эффективным из которых оказался аптамер NV14t_57. Теоретические расчёты показали, что аффинность аптамеров определяется их трёхмерной структурой, зависящей от способа модификации. Заключение. Получен высокоселективный аптамер NV14t_57, который является наиболее перспективным кандидатом для дальнейшей работы по созданию препарата для противоопухолевой терапии онкологических заболеваний на основе онколитического вируса осповакцины VVGMCSF-Lact.Introduction. Destruction of malignant tumours with oncolytic viruses is one of the most effective and safe methods of antitumor therapy. To gain access to tumour cells, the virus must circulate in the bloodstream for a long time, avoiding the action of the immune system. However, when a virus is introduced into the body, it provokes the production of virus-neutralising antibodies that reduce its antitumor effect. The most effective way to protect a virus from antibodies that neutralise it is to screen it: in particular, using selective DNA aptamers. The aim of the research. Using experimental methods and theoretical calculations, to develop DNA aptamers suitable for creating an antitumor drug based on the VV-GMCSF-Lact oncolytic virus, which effectively screen viruses and can protect them from virus-neutralising antibodies. Material and methods. Modelling of the secondary structures of aptamers was performed using the mFold program for nucleic acid folding, modelling of the corresponding spatial full-atom structures of aptamers was performed using the SimRNA and VMD programs. Molecular dynamics calculations were carried out using the GROMACS 2018.8 software package. Cluster analysis of the obtained molecular dynamic trajectories was performed using the VMD program. Binding of Cy5-modified aptamers to the virus was assessed using flow cytometry on a BD FACSCanto II cytometer (Becton Dickinson, Franklin Lakes, New Jersey, USA). Results. Modification of aptamers experimentally obtained using the SELEX technology made it possible to obtain five truncated oligonucleotides NV1t_72, NV4t_64, NV4t_53, NV14t_41, and NV14t_57, which screen the oncolytic virus VV-GMCSF-Lact, the most effective of which was the NV14t_57 aptamer. Theoretical calculations have shown that the affinity of aptamers is determined by their three-dimensional structure, which depends on the method of modification. Conclusion. A highly selective aptamer NV14t_57 has been obtained, which is the most promising candidate for further work on the creation of a drug for antitumor therapy of oncological diseases based on the VV-GMCSF-Lact oncolytic vaccinia virus.
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7.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Knyazev Yu. V., Balaev D. A., Skorobogatov S. A., Velikanov D. A., Bayukov O. A., Stolyar S. V., Yaroslavtsev R. N., Iskhakov R. S.
Заглавие : Spin dynamics in ensembles of ultrafine ferrihydrite nanoparticles
Место публикации : Phys. Rev. B. - 2023. - Vol. 107, Is. 11. - Ст.115413. - ISSN 24699950 (ISSN), DOI 10.1103/PhysRevB.107.115413. - ISSN 24699969 (eISSN)
Примечания : Cited References: 66. - The electron microscopy study and ac susceptibility measurements were carried out on the equipment of the Krasnoyarsk Territorial Center for Collective Use, Krasnoyarsk Scientific Center, Siberian Branch of the Russian Academy of Sciences. This study was supported by the Russian Science Foundation, Project No. 21-72-00025 Tuning the Magnetic Properties of Ultrafine Biocompatible Ferrihydrite Nanoparticles through Interparticle Interactions [66]
Аннотация: Features of the spin dynamics in ensembles of interacting (FH-chem) and weakly interacting (FH-coated) magnetic ultrasmall (‹d› ∼ 2 nm) ferrihydrite nanoparticles have been explored. The dc and ac magnetic susceptibilities [χ'(T ) and χ''(T )] of the investigated samples have been thoroughly measured in a weak magnetic field (2 Oe) around the temperatures of superparamagnetic blocking of the nanoparticle magnetic moments (19 and 50.4 K for FH-coated and FH-chem, respectively, according to the dc magnetization data). It has been shown that the magnetic interactions between nanoparticles induce the formation of the cluster spin-glass state below the superparamagnetic blocking temperature (Tg = 18 and 49.5 K for FH-coated and FH-chem, respectively). It has been found that coating of nanoparticles increases the critical scaling index from zν = 5.9 (FH-chem) to zν = 8.0 (FH-coated). This indicates a general slowdown of the dynamics of correlated spins, which is also expressed as an increase in relaxation time τ0 after switching on the interparticle interactions. We attribute this phenomenon to a consequence of a change in the volume of correlated spins with the increasing size of a cluster of interacting nanoparticles. It has been demonstrated using the simulated χ''(T ) dependence that the dissipation of the magnetic energy occurs in two independent stages. The first stage is directly related to the blocking of the nanoparticle magnetic moments, while the second stage reflects the spin-glass behavior of surface spins and depends strongly on the intensity of the interparticle interactions.
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8.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Krylova S. N., Popova E. A., Kitaev Yu. E., Lushnikov S. G.
Заглавие : Lattice dynamics of the BaMg1/3Ta2/3O3 complex perovskite
Коллективы : Уральский Федеральный университет им. Первого Президента России Б.Н. Ельцина, Ural Federal University, "Materials science and nanotechnology", International conference
Место публикации : Materials Science and Nanotechnology (MSN-2023): abstract book of International conference/ Ural Federal University; org. com. A. N. Vtyurin [et al.]. - Ekaterinburg, 2023. - Ст.O14. - P.54. - ISBN 978-5-9500624-6-9
Примечания : Cited References: 9. - Russian Foundation for Basic Research and DFG project No 21-52-12018
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9.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gerasimova Yu. V., Aleksandrovsky A. S., Laptash N. M., Krylov A. S., Gerasimov M. A., Dubrovskiy A. A.
Заглавие : Raman scattering, absorption and luminescence spectroscopy of CoSiF6·6H2O crystal and CoSiF6·6H2O:Mn4+ red-emitting phosphor
Колич.характеристики :6 с
Место публикации : Opt. Mater. - 2023. - Vol. 144. - Ст.114343. - ISSN 09253467 (ISSN), DOI 10.1016/j.optmat.2023.114343. - ISSN 18731252 (eISSN)
Примечания : Cited References: 30. - The reported study was funded by Russian Science Foundation , Government of Krasnoyarsk Territory and Krasnoyarsk Regional Foundation of Science according to the research project ‘‘Synthesis, spectral and magnetic properties of ABF6·6H2O systems, new materials for photonics.” No. 23-22-10037 . https://rscf.ru/en/project/23-22-10037/ . Usage of equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS is acknowledged. We thank A. Yu. Mamaev for recording the luminesce spectra of CoSiF6·6H2O:Mn 4+
Аннотация: CoSiF6·6H2O and CoSiF6·6H2O:Mn4+ crystals were investigated by means of Raman, optical absorption, and luminescence spectroscopy. Absorption spectra of CoSiF6·6H2O are analyzed by Tanabe-Sugano technique and are proved to be well-describable at crystal field strength Dq = 1000 cm−1, and Racah parameters B = 896 cm−1, C = 4408 cm−1, Dq/B = 1.116. Raman spectroscopy reveals a phase transition associated with the ordering of both the CoO6 and SiF6 octahedra, which occurs through the ordering of the H2O subsystem. Luminescence spectrum of Mn4+ ions in CoSiF6·6H2O lattice consists of six components corresponding to Stokes and anti-Stokes emission from 2E state of Mn4+ ion at vibrational frequencies of MnF6 octahedron ν6 = 230 cm−1, ν4 = 335 cm−1, and ν3 = 645 cm−1. Quantum efficiency of red emission maximizes at excitation wavelength 357 nm and equals to 5%. Decrease of quantum efficiency in comparison to other related materials is explained by absorption of Co2+ ions and non-radiative relaxation in the Co2+ subsystem.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Smirnova E. S., Alekseeva O. A., Artemov V. V., Sorokin T. A., Khmelenin D. N., Sidorova E. V., Frolov K. V., Gudim I. A.
Заглавие : Crystal structure of bismuth-containing samarium iron–aluminium borates Sm1−xBixFe3−yAly(BO3)4 (x = 0.05–0.07, y = 0–0.28) in the temperature range of 25–500 K
Колич.характеристики :20 с
Место публикации : Crystals. - 2023. - Vol. 13, Is. 7. - Ст.1128. - ISSN 20734352 (eISSN), DOI 10.3390/cryst13071128
Примечания : Cited References: 59. - This work was supported by the Russian Science Foundation (project No 23-22-00286)
Аннотация: Structural features of new mixed bismuth-containing samarium iron–aluminium borate single crystals Sm1−xBixFe3−yAly(BO3)4 (x = 0.05–0.07, y = 0–0.28) were studied using X-ray diffraction analysis based on aluminium content and temperature in the range 25–500 K. The crystals were grown using the solution-in-melt technique with Bi2Mo3O12 in a flux. The composition of the single crystals was analyzed using energy-dispersive X-ray fluorescence and energy-dispersive X-ray elemental analysis. Temperature dependencies of Sm1−xBixFe3−yAly(BO3)4 unit-cell parameters were studied. Negative thermal expansion was identified below 100 K and represented by characteristic surfaces of the thermal expansion tensor. (Sm,Bi)–O, (Sm,Bi)–(Fe,Al), (Fe,Al)–(Fe,Al), and (Fe,Al)–O interatomic distances decreased with the addition of aluminium atoms. An increase in the (Fe,Al)–(Fe,Al) intrachain bond length at low temperatures in the magnetically ordered state weakened this bond, whereas a decrease in the (Fe,Al)–(Fe,Al) interchain distance strengthened super-exchange paths between different chains. It was found that the addition of aluminium atoms influenced interatomic distances in Sm1−xBixFe3−yAly(BO3)4 much more than lowering the temperature from 293 K to 25 K. The effect of aluminium doping on magnetoelectric properties and structural symmetry of rare-earth iron borates is also discussed.
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