Synthesis of lanthanum manganite powders via combustion reactions: some aspects of the influence of magnetic field and charge generation in precursors on the formation of properties

The mutual influence of the process of electric charge generation in nitrate organic precursors and a constant external magnetic field on the magnetic properties formation was considered for lanthanum strontium manganite La0.7 Sr0.3 MnO3±y powders obtained via combustion reactions. The investigated properties of the obtained samples include hysteresis, magnetocaloric and magnetoresistive effects. The correlation between formation process of extended ensembles of nanoparticles and the functional properties of complex oxide materials was also discussed. The manifestation of a strong magneto-gas-selective effect has been ob-served during the combustion of precursors in a constant magnetic field, which affects the charge generation process. © Ostroushko A.A., Gagarin I.D., Kudyukov E.V., Zhulanova T.Yu., Permyakova A.E., Russkikh O.V., 2023.Russian Science Foundation, RSF: 22-23-00718ABSTRACT The mutual influence of the process of electric charge generation in nitrate organic precursors and a constant external magnetic field on the magnetic properties formation was considered for lanthanum strontium manganite La0.7Sr0.3MnO3±y powders obtained via combustion reactions. The investigated properties of the obtained samples include hysteresis, magnetocaloric and magnetoresistive effects. The correlation between formation process of extended ensembles of nanoparticles and the functional properties of complex oxide materials was also discussed. The manifestation of a strong magneto-gas-selective effect has been observed during the combustion of precursors in a constant magnetic field, which affects the charge generation process. KEYWORDS complex oxides, lanthanum manganite, synthesis, combustion reactions, nitrate-organic systems, nanoparticles, charges generation, magnetic properties, magneto-gas selective effect ACKNOWLEDGEMENTS The research was financially supported by a grant from the Russian Science Foundation (Project No. 22-23-00718). The research was carried out using the equipment of the Ural Center for Collective Use “Modern Nanotechnologies”

Mathematical model of diagnostics of perinatal damage of the central nervous system in infants in the neonatal period

Questions of relevance and timeliness of diagnostics of perinatal disturbances of the central nervous system in newborns are considered in the article. Research objective was to determine the reliable recognition of the development of newborn encephalopathy at the age of the first two weeks of life according to neurological examination and neurosonography parameters with Doppler study of cerebral vessels. Features of the neurology status and data of ultrasonic examination of brain with Doppler study of cerebral vessels in 58 newborns with pathology of the nervous system and 23 healthy newborns are investigated. 10 sings of the neurological status and 10 parameters of ultrasonic examination are analyzed. By results of the obtained findings, prognostic rule is developed, governed by application of discriminant analysis of the studied signs, allowing to diagnose encephalopathy in newborn with sensitivity and specificity of 95% in the first week of life. Its application promotes timely identification and the beginning of therapy at infants from risk group of development of severe neurological dysfunction and preventing the growth of disability among infants. © 2017 Team of Authors

Physicochemical and biochemical properties of the Keplerate-type nanocluster polyoxomolybdates as promising components for biomedical use

The paper discusses the results of a research on physicochemical and biochemical properties of the Keplerate-type molybdenum-based nanocluster polyoxometalates (POMs), which show promise in the field of biomedicine as a means of targeted drug delivery, including the transport to immune privileged organs. POMs can be considered as components of releasing systems, including the long-acting ones with feedback (for controlling the drug active component release rate). POMs are promising drugs for the treatment of anemia. Also, the paper deals with the results of studies of POM effect on living systems at the molecular and cellular levels, at that of individual organs, and on the organism as a whole. The mechanism and kinetics of POM destruction and possibilities of stabilization, the oscillatory phenomena manifestation, the formation of POM conjugates with bioactive substances which can be released during the destruction of POM, with polymer components, and with indicator fluorescent dyes, as well as forecasts for further research, are considered. © 2021, ITMO University. All rights reserved.The paper was prepared in the framework of implementation of the State Assignment from the Ministry of Education and Science of the Russian Federation (Projects Nos. AAAA-A20-120061990010-7 (FEUZ-2020-0052) and AAAA-A18-118020590107-0), as well as of the Program for Increasing Competitiveness of UrFU (financially supported according to the Decree No. 211 of the Government of the Russian Federation, Contract No. 02.A03.21.0006). The research aimed at creating the long-time drug release systems with feedback was carried out within the framework of the project of the Russian Science Foundation No. 19-73-00177

MATHEMATICAL MODEL OF DIAGNOSTICS OF PERINATAL DAMAGE OF THE CENTRAL NERVOUS SYSTEM IN INFANTS IN THE NEONATAL PERIOD

Questions of relevance and timeliness of diagnostics of perinatal disturbances of the central nervous system in newborns are considered in the article. Research objective was to determine the reliable recognition of the development of newborn encephalopathy at the age of the first two weeks of life according to neurological examination and neurosonography parameters with Doppler study of cerebral vessels. Features of the neurology status and data of ultrasonic examination of brain with Doppler study of cerebral vessels in 58 newborns with pathology of the nervous system and 23 healthy newborns are investigated. 10 sings of the neurological status and 10 parameters of ultrasonic examination are analyzed. By results of the obtained findings, prognostic rule is developed, governed by application of discriminant analysis of the studied signs, allowing to diagnose encephalopathy in newborn with sensitivity and specificity of 95% in the first week of life. Its application promotes timely identification and the beginning of therapy at infants from risk group of development of severe neurological dysfunction and preventing the growth of disability among infants

Synthesis, morphology, and activity of La1-xAgxMnO3 +/- y catalysts

La1-xAgxMnO3 +/- y (x = 0-0.3) mixed oxides have been synthesized by the pyrolysis of polymer-salt compositions using different organic compounds and different salt: organic compound ratios. The correlation between the reaction medium temperature during pyrolysis, the composition of the resulting oxide, and synthesis conditions has been investigated. The effect of these conditions on the character of the pyrolysis process, on the phase composition and microstructure of the resulting oxide particles and metallic silver, and on their mutual distribution is reported. The catalytic properties of the synthesized oxides in methane and soot oxidation are considered, and a correlation is established between the catalytic activity of the oxides and the synthesis conditions

MULTI-CHANNEL VOLUME SPHYGMOGRAPHY IN CARDIOANGIOLOGICAL SCREENING OF THE ADULT POPULATION

Aim. To study the possibilities of using multi-channel volume sphygmography (MCVS) in prophylactic medical examination of the population.Material and methods. Simultaneous examination of 522 individuals older than 18 years was performed. Along with standard procedures provided by the prophylactic medical examination program synchronous registration of blood pressure (BP) on four extremities by MCVS was performed. At that a difference in systolic BP between arms (ΔSBParm) and legs (ΔSBPleg) and ankle-brachial index (ABI) were automatically calculated. Values of │ΔSBParm│ or │ΔSBPleg│≥15 mm Hg or ABI≤0.9 were considered as markers of atherosclerotic vascular disease.Results. Signs of peripheral arterial atherosclerotic lesions among patients ≥40 years old were found in 14.7% of the cases (95% confidence interval [CI] 11.7-18.4). Relative risks of atherosclerotic lesions in arteries increase 1.71-fold (95% CI 1.06-2.74) in arterial hypertension, 1.70-fold (95% CI 1.08-2.68) – in obesity, 1.91 fold (95% CI 1.17-3.12) – in diabetes, as well as with the increasing levels of cardiovascular risk. In patients with ischemic heart disease and a history of cerebral stroke MCVS can detect signs of multifocal atherosclerosis in 21% (95% CI 14-32) and 22% (95% CI 9-46) of the cases, respectively.Conclusion. MCVS with the determination of ΔSBParm, ΔSBPleg and ABI may be regarded as the basis for low-cost and efficient system of cardioangiological screening.</p