Влияние коронавирусной инфекции COVID-19 на когнитивные функции и физическую работоспособность студентов

In the article, the symptoms of coronavirus infection COVID-19, its effect on the cognitive functions and physical performance of students of a higher education institution of medical profile are described, the measures to prevent the spread of this infection are considered, as well as the measures for a subsequent recovery of students, who have undergone this disease and have entered the educational process, are proposed.Раскрываются симптомы коронавирусной инфекции COVID-19, ее влияние на когнитивные функции и физическую работоспособность студентов учреждения высшего образования медицинского профиля, рассмотрены меры профилактики распространения данной инфекции, а также предлагаются меры последующего восстановления студентов, перенесших данное заболевание и приступивших к образовательному процессу

Значимость активности аргиназы печени и клеток Купфера в процессах детоксикации и формировании тиреоидного статуса у крыс при хронической алкогольной интоксикации различной тяжести

Modern medicine faces the problem of a steady growth of alcoholic pathology. As you know, morbidity and mortality with a regular consumption of alcoholic beverages is associated with the toxic effects of ethanol on the most important human organs and, first of all, on the liver. To date, a sufficient number of facts are accumulated, indicating the importance of liver arginase and Kupffer cells in vital processes in health and disease. The aim of the study was to elucidate the significance of the activity of liver arginase and Kupffer cells in the detoxification processes and the thyroid status formation in rats with chronic ethanol intoxication of different severity. In rat experiments using modern physiological, biochemical research methods and a pharmacological approach, it was found that liver arginase and Kupffer cells participate in changes in the liver detoxification function and the thyroid status formation induced by chronic ethanol intoxication. The activity of liver arginase and Kupffer cells determines the severity of detoxification processes and the thyroid status formation in chronic alcohol intoxication. The direction and severity of changes in the arginase activity and the liver detoxification function during chronic alcoholism depends on the severity of chronic alcohol intoxication. Under the influence of daily intragastric administration for 60 days, a 30 % aqueous solution of ethanol (3.5 g 92 % ethanol per kg of body weight) in animals inhibited the activity of liver arginase and the detoxification function, but the introduction of a 10 % aqueous solution of ethanol (1.0 g 92 % ethanol per kg of body weight) within 2 months leads to an increase in the activity of liver arginase and detoxification processes. Kupffer cells depression by GdCl3 as the action in the body of the NO-synthase inhibitor methyl ester NG-nitro-L-arginine weakens and the arginase inhibitor Nω-hydroxy-nor-L-arginine contributes to the development of characteristic changes in the processes of detoxification and triiodothyronine level in plasma during chronic alcohol intoxication caused by intragastric introduction of ethanol at a dose of 3.5 g/kg for 60 days.Современная медицина стоит перед проблемой неуклонного роста алкогольной патологии. А как известно, заболеваемость и смертность при регулярном употреблении алкогольных напитков связана с токсическим воздействием этанола на важнейшие органы человека и, в первую очередь, печень. К настоящему времени накопилось достаточное количество фактов, свидетельствующих о значении аргиназы печени и клеток Купфера в процессах жизнедеятельности в норме и при патологии. Целью исследования было выяснение значимости активности аргиназы печени и клеток Купфера в процессах детоксикации и формировании тиреоидного статуса у крыс при хронической этаноловой интоксикации различной тяжести. В опытах на крысах с использованием современных физиологических, биохимических методов исследования и фармакологического подхода было установлено, что активность аргиназы печени и клеток Купфера определяют выраженность процессов детоксикации и формирование тиреоидного статуса при хронической алкогольной интоксикации. Направленность и выраженность изменений активности аргиназы и детоксикационной функции печени при хронической алкоголизации зависит от тяжести хронической алкогольной интоксикации. Под влиянием ежедневного интрагастрального введения в течение 60 дней 30 %-ного водного раствора этанола (3,5 г 92 %-ного этанола на кг массы тела) у животных угнетается активность аргиназы и детоксикационной функции печени, а введение 10 %-ного водного раствора этанола (1,0 г 92 %-ного этанола на кг массы тела) в течение двух месяцев приводит к повышению активности аргиназы печени и процессов детоксикации. Депрессия клеток Купфера GdCl3, как и действие в организме ингибитора NO-синтазы метилового эфира NG-нитроL-аргинина ослабляет, а ингибитора аргиназы Nω-гидрокси-нор-L-аргинина способствует развитию характерных изменений в процессах детоксикации и уровня трийодтиронина в плазме крови при хронической алкогольной интоксикации, вызываемой интрагастральным введением этанола в дозе 3,5 г/кг в течение 60 дней

Study of the stochastic clustering on the refractory material surface under the effect of plasma load in the PLM device

Tungsten plates were tested in stationary helium discharges in the PLM device. The duration of discharges in the PLM reached 200 minutes. A distinctive feature of this device is the stationary plasma confinement, which is advantageous for testing fusion materials, including materials of the divertor and first wall of a fusion reactor. During plasma irradiation in the PLM, the thermal load on the surface of the tested plates was more than 1 MW/m(2). The temperature of the tested plates amounted to 1000 degrees C and more. Stochastic nanostructures with dimensions of the structural elements of less than 50 nm, including fuzz-type structures, were observed on the processed surfaces of the samples

Low frequency 1/f noise in doped manganite grain-boundary junctions

We have performed a systematic analysis of the low frequency 1/f-noise in single grain boundary junctions in the colossal magnetoresistance material La_{2/3}Ca_{1/3}MnO_{3-delta}. The grain boundary junctions were formed in epitaxial La_{2/3}Ca_{1/3}MnO_{3-delta} films deposited on SrTiO_3 bicrystal substrates and show a large tunneling magnetoresistance of up to 300% at 4.2 K as well as ideal, rectangular shaped resistance versus applied magnetic field curves. Below the Curie temperature T_C the measured 1/f noise is dominated by the grain boundary. The dependence of the noise on bias current, temperature and applied magnetic field gives clear evidence that the large amount of low frequency noise is caused by localized sites with fluctuating magnetic moments in a heavily disordered grain boundary region. At 4.2 K additional temporally unstable Lorentzian components show up in the noise spectra that are most likely caused by fluctuating clusters of interacting magnetic moments. Noise due to fluctuating domains in the junction electrodes is found to play no significant role.Comment: 9 pages, 7 figure

Impact of liquid metal surface on plasma-surface interaction in experiments with lithium and tin capillary porous systems

The lithium and tin capillary-porous systems (CPSs) were tested with steady-state plasma in the PLM plasma device which is the divertor simulator with plasma parameters relevant to divertor and SOL plasma of tokamaks. The CPS consists of tin/lithium tile fixed between two molybdenum meshs constructed in the module faced to plasma. Steady-state plasma load of 0.1 - 1 MW/m(2) on the CPS during more than 200 min was achieved in experiments on PLM which is a modeling far scrapeoff- layer and far zone of divertor plasma of a large tokamak. The heating of the CPS was controlled remotely including biasing technique which allows to regulate evaporated metal influx to plasma. After exposure, the materials of the tin and lithium CPSs were inspected and analyzed with optic and scanning electron micriscopy. Experiments have demonstrated sustainability of the tin and lithium CPSs to the high heat steady state plasma load expected in a large scale tokamak. The effect of evaporated lithium and tin on the plasma transport/radiation was studied with spectroscopy to evaluate changes of plasma properties and plasma-surface interaction

Advances in ITER-relevant Nb-Ti and Nb3_{3}Sn strands and low-loss Nb-Ti strands in RF

The review of the main results of R&D directed on the enhancement of ITER relevant NbTi and Nb$_{3}$Sn strands performance recently carried out in Russia (the Bochvar Institute) are presented. For ITER PF type (NbTi) strands with Cu/non Cu ratio of 1.6 the attainment of ITER specified critical current density (Jc) ≥ 2900 A/mm2 (5 T, 4.2 K) has been shown. For Toroidal Field (TF) strands (Nb$_{3}$Sn) the influence of doping and layout peculiarities of the wires produced by bronze method on their current-carrying ability has been investigated. It was shown that with non-doped matrix and doped filaments Jc exceeds 800 A/mm2 (12 T, 4.2 K) while with the application of the doped bronze and nondoped filaments it exceeds 900 A/mm2. Internal-tin Nb$_{3}$Sn strand meeting the ITER TF specification requirements was also developed and fabricated. The results of testing of CICC samples in a SULTAN facility have shown that performance parameters are higher than ITER qualification requirements Low loss model fine filament NbTi strands, intended for operating in fields with a ramp rate from 1 up to 4 T/s, has been developed and manufactured. The use of commercial MN-5 alloy (Cu-5wt.%Ni) and the Cu- 0.5wt.%Mn alloy for matrix of strands are discussed. The critical current density higher than 2700 A/mm2 (5 T, 4.2 K was shown to be attainable

Study of a deformed state by radioactive isotopes /

Prepared for the National Science Foundation Russian Science Translation-Dictionary Project, Columbia University.Translated from Doklady Akademii Nauk SSSR, 91, 803-6 (1953)--title page."December 1953."Mode of access: Internet