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1H NMR and EPR Spectroscopies Investigation of Alginate Cross-Linking by Divalent Ions
Materials. 2023. Vol. 16. No. 7. P. 2832–2843.
Forysenkova Anna A., Ivanova V., Fadeeva I., Mamin G., Rau J.
Zubareva A., Svirshchevskaya E., Nedoluzhko A. et al., Polysaccharides 2025 Vol. 6 No. 4 Article 111
The global aquaculture industry faces a number of challenges, including the risk of infection spreading in closed aquatic ecosystems. Since 1942, vaccination has become a mainstream approach in fish cultivation. However, the immune system of cold-blooded organisms differs significantly from that of mammals, which must be taken into account when developing vaccines for aquaculture. Modern ...
Added: March 26, 2026
Gorshkova M. Y., Vanchugova L. V., Valuev I. L. et al., Polymer Science - Series C 2024 Vol. 66 No. 2 P. 174–184
The influence of the composition of hybrid hydrogels based on macromonomeric unsaturated derivative of sodium alginate and diethylacrylamide synthesized by radical copolymerization with redox initiation on their structure and properties was studied. It was shown that the introduction and an increase in the content of alginate macromonomer lead to significant changes in the supramolecular structure ...
Added: March 1, 2026
Гречишникова А. А., Трофимчук Е. С., Егоров А. А. et al., Перспективные материалы 2025 № 11 С. 17–28
Composite gels based on polyvinylpyrrolidone (PVP) and alginate (Alg) with carbonate hydroxyapatite (CHA) were obtained. Their kinematic and dynamic viscosities were measured. It has been shown that the introduction of CHA in an amount of up to 40 % by weight of polymers leads to a decrease in kinematic viscosity, and the introduction of 50 ...
Added: November 26, 2025
Forysenkova Anna A., Fadeeva I., Deyneko D. et al., Materials 2023 Vol. 16 No. 12 P. 4478–4492
An alternative approach for the currently used replacement therapy in dentistry is to apply materials that restore tooth tissue. Among them, composites, based on biopolymers with calcium phosphates, and cells can be applied. In the present work, a composite based on polyvinylpyrrolidone (PVP) and alginate (Alg) with carbonate hydroxyapatite (CHA) was prepared and characterized. The ...
Added: August 12, 2025
Murzakhanov F., Forysenkova Anna A., Fadeeva I. et al., Ceramics 2022 Vol. 5 No. 3 P. 318–329
Powders of β-tricalcium phosphate (β-TCP, Ca3PO4) doped with manganese (Mn2+) are comprehensively analyzed with electron paramagnetic resonance (EPR) and electron-nuclear double resonance (ENDOR) techniques. The modeling of the spectra permitted to calculate the values of zero-field splitting (𝐵02 = −904 MHz; 𝐵04 = −1.41 MHz and 𝐵34 = 195.2 MHz) and explain the origin of the low-field hyperfine structures as ...
Added: August 12, 2025
Forysenkova Anna A., Konovalova M., Fadeeva I. et al., Materials 2023 Vol. 16 No. 16 P. 5532–5549
Surgical operations on the peritoneum are often associated with the formation of adhesions, which can interfere with the normal functioning of the internal organs. The effectiveness of existing barrier materials is relatively low. In this work, the effectiveness of soluble alginate–polyvinylpyrrolidone (PVP-Alg) and non-soluble Ca ion cross-linked (PVP-Alg-Ca) films in preventing these adhesions was evaluated. ...
Added: August 12, 2025
Sadovnikova M., Murzakhanov F., Fadeeva I. et al., Ceramics 2022 Vol. 5 No. 4 P. 1154–1166
Tricalcium phosphate (TCP)-based materials, such as β-Ca3(PO4)2 doped with rare earth ions (RE), have shown applications as biomaterials, lighting emitting materials, scintillating materials, in vivo imaging probes, and thermoluminescent dosimeters. Their properties are found to be dependent on the distribution of RE3+ on Ca2+ sites that can be controlled by pulsed electron paramagnetic resonance (EPR) and electron spin ...
Added: August 12, 2025
Гречишникова А. А., Слукин П. В., Трофимчук Е. С. et al., Перспективные материалы 2022 № 7 С. 35–48
Powders of copper, zinc, manganese-substituted tricalcium phosphates (TCP) were synthesized, the composition and structure of the obtained compounds were studied. It is shown how copper, zinc and manganese ions affect the phase composition and microstructure of powders substituted with TCP. Composite materials based on a blend of polyvinylpyrrolidone with alginate (PVP:ALG) containing copper, zinc, and ...
Added: August 12, 2025
S. K. Gotovko, Ivanova A. G., P. S. Kudimkina et al., Physical Review B: Condensed Matter and Materials Physics 2025 Vol. 111 No. 6 Article 064430
We present the study of low-frequency dynamics of LiCu3O3—an antiferromagnet on a strongly depleted square lattice. The crystal structure contains two types of square planes with different Li+→Cu2+ substitution rates (20% and 40%). Recent nuclear magnetic resonance (NMR), magnetization measurements and neutron scattering experiments revealed the occurrence of antiferromagnetic order at 𝑇𝑐1=123K and the change ...
Added: March 3, 2025
S. V. Demishev, Shestakov A. V., Yatsyk I. V. et al., Solid State Communications 2024 Vol. 385 Article 115501
In the spiral conical phase of manganese monosilicide, MnSi, the EPR spectra are studied at a frequency of 9.3
GHz in the temperature range of 5–30 K for an external magnetic field oriented along the crystallographic di
rection [100]. It is found that in the temperature range T < T* = 25 K, located 4 K below ...
Added: February 9, 2025
Demishev S. V., Applied Magnetic Resonance 2024 Vol. 55 P. 1091–1114
Semiclassical magnetization dynamics in presence of magnetic fluctuations (including the quantum ones) is derived for a strongly correlated electronic system in the region of the linear magnetic response. Landau–Lifshitz (LL) and Gilbert (G) type equations are obtained with the effective parameters depending on the type of magnetic fluctuations and their magnitude and applied to evaluation ...
Added: February 9, 2025
Smirnov I., Biriukov K., Shvydkiy N. et al., Journal of Organic Chemistry 2024 Vol. 89 No. 14 P. 10338–10343
Manganese complexes [(arene)Mn(CO)3]+ were prepared in one step from arenes and Mn(CO)5Br. They were found to be efficient catalysts in the carbonyl cyanation with TMSCN, CO2 fixation by epoxides, and direct reductive amination in the presence of syngas. The amination reaction tolerated various reducible functional groups. The synergy of carbon monoxide and hydrogen in syngas provides high ...
Added: January 23, 2025
Красавин А. В., Review of Scientific Instruments 2018 Vol. 89 Article 033907
A technique is presented of restoring the electronic density of states of the valence band from data of X-ray photoelectron spectroscopy (XPS). The originality of the technique consists in using a stochastic procedure to solve an integral equation relating the density of states and the experimental X-ray photoelectron spectra via the broadening function. To obtain ...
Added: July 18, 2023
Sosin S., Яфарова А. Ф., Романова И. В. et al., Письма в Журнал экспериментальной и теоретической физики 2022 Т. 116 № 11-12 С. 747–755
Low-temperature electron paramagnetic resonance measurements are performed on single crystals of LiY1 – xGdxF4 with low x = 0.005 and moderate x = 0.05 concentration of Gd ions. Modeling of the experimental spectra allows us to precisely determine microscopic parameters of the spin Hamiltonian of the parent LiGdF4 material, including the nearest-neighbor exchange constant. The obtained parameters ...
Added: December 7, 2022
Demishev S. V., Doklady Physics 2021 Vol. 66 No. 7 P. 187–190
The Landau–Lifshitz equation modified by quantum fluctuations of the magnetic moment is proposed, on the basis of which several new effects in electron paramagnetic resonance in strongly correlated electronic systems are predicted, including an increase in the integral intensity and the appearance of universal relations connecting the contribution to the linewidth, the shift of the ...
Added: October 25, 2022
Demishev S. V., Semeno A. V., Applied Magnetic Resonance 2022 Vol. 53 No. 11 P. 1505–1516
A simple semi-classical model of magnetization dynamics based on Landau-Lifshits equation of motion with anisotropic effective g-tensor and anisotropic spin relaxation is proposed and applied to the case of electron paramagnetic resonance (EPR). In the Faraday geometry, the model predicts polarization effect consisting in strong dependence of the EPR line shape and magnitude on orientation ...
Added: October 25, 2022
Perelygin V., Voinov M., Marek A. et al., Journal of Physical Chemistry C 2019 Vol. 123 No. 49 P. 29972–29985
Interfacial electrostatic properties of monodisperse silica nanoparticles (SiNPs) in aqueous suspensions as a function of bulk pH were characterized by spin labeling EPR of two ionizable nitroxides: (1) IMTSL (S-(1-oxyl-2,2,3,5,5-pentamethylimidazolidin-4-yl)methylmethanesulfo-nothioate) and IKMTSL (S-4-(4-(dimethylamino)-2-ethyl-5,5-dimethyl-1-oxyl-2,5-dihydro-1H-imidazol-2-yl). SiNPs of ca. 116 nm in diameter (by particle number) were synthesized using the Stöber method, and their surface was modified by ...
Added: June 10, 2022
Stolyarov V., Remizov S., Shapiro D. S. et al., Applied Physics Letters 2017 Vol. 111 No. 25 Article 251601
The influence of individual impurities of Fe on the electronic properties of topological insulator Bi2Se3 is studied by Scanning Tunneling Microscopy. The microscope tip is used in order to remotely charge/discharge Fe impurities. The charging process is shown to depend on the impurity location in the crystallographic unit cell, on the presence of other Fe impurities ...
Added: October 29, 2021
Natalia A. M., Alexandr D. M., Vitali A. G. et al., Materials Chemistry and Physics 2021 Vol. 259 Article 123968
A nanoscale bimetallic alloy catalyst PtFe/C is prepared by pyrolysis of the heterometallic platinum-iron carboxylate complex [PtFe(OAc)4]2O⋅4CH2Cl2 on Vulcan XC-72 carbon black. It is characterized by X-ray powder diffraction analysis, X-ray fluorescence spectroscopy, transmission electron microscopy, and electrochemical methods. Its activity in the oxygen reduction reaction (ORR) is tested in an aqueous H2SO4 electrolyte in model conditions, ...
Added: March 10, 2021
Semeno A. V., Anisimov M. A., Bogach A. V. et al., Scientific Reports 2020 Vol. 10 P. 1–10
Randomness and frustration are believed to be two crucial criteria for the formation of spin glass state. However, the spin freezing occurs in some well-ordered crystals below the related temperature Tf due to the instability of each spin state, which induces the variation of either magnetic moment value or exchange energy. Here we explore the ...
Added: December 25, 2020
S. V. Demishev, Gilmanov M. I., Samarin A. N. et al., Applied Magnetic Resonance 2020 Vol. 51 No. 1 P. 71–84
The low temperature (T < 5 K) electron spin resonance in topological Kondo insulator SmB6 is investigated. It is shown that spin relaxation time of the paramagnetic centers responsible for low temperature electron spin resonance in SmB6 is about ~ 10−8 s, which exceeds by five orders of magnitude the widely accepted spin and charge fluctuation time ~ 10−13 s in the homogeneous ...
Added: December 24, 2020
Gannesen A., Zdorovenko E., Botchkova E. et al., Frontiers in Microbiology 2019 Vol. 10:1284 P. 1–16
In skin, Cutibacterium acnes (former Propionibacterium acnes) can behave as an opportunistic pathogen, depending on the strain and environmental conditions. Acneic strains of C. acnes form biofilms inside skin–gland hollows, inducing inflammation and skin disorders. The essential exogenous products of C. acnes accumulate in the extracellular matrix of the biofilm, conferring essential bacterial functions to this structure. However, little is known about ...
Added: October 23, 2020