Relationship between HLA-II Gene Polymorphisms and Immune Response in COVID-19 Survivors and Volunteers Vaccinated against This Infection.

The polymorphism of HLA class II genes was studied in COVID-19 survivors and vaccinated people. Six allelic variants of DQA1, 10 of DQB1, and 11 of DRB1 were identified. The DQA1*05:01 allele predominated in vaccinated volunteers and the DQA1*02:01, *01:03, and DQB1*06:02-8 alleles predominated in convalescents.

High Densification of Tungsten via Hot Pressing at 1300 °C in Carbon Presence.

A reactive sintering technique with a small addition of carbon (up to 1.9 wt.%) has been used for tungsten powder consolidation.

Peculiarities of Humoral Immunity Formation in Medical Institution Employees Recovered from or Vaccinated against COVID-19 in Irkutsk.

We performed a seroepidemiological survey of the level and structure of population immunity to SARS-CoV-2 among employees of medical institution in the Irkutsk region during the COVID-19 pandemic. Seroprevalence assessment was organized from May 2020 to April 2021. The level of antibodies to SARS-CoV-2 was measured by ELISA.

Reaction Sintering of Machinable TiB-BN-C Ceramics with In-Situ Formed h-BN Nanostructure.

Soft TiB-BN-C hetero-modulus ceramics were sintered with the assistance of in-situ reactions during the hot pressing of TiN-BC precursors. TiB formation was observed already after the hot pressing at 1100 °C, remaining the only phase identifiable by XRD even after sintering at 1500 °C. Analysis of reaction kinetics allows us to assume that the most probable reaction controlling stage is boron atoms sublimation and gas phase transfer from BC to TiN.

Reaction Sintering of Biocompatible AlO-hBN Ceramics.

Biocompatible AlO-hBN ceramic was sintered from AlN and BO precursors by reaction hot pressing at 1750 °C and 30 MPa for 8 min. The ceramic was compared to nonreactive (NR) one sintered from AlO and BN under the same sintering conditions. The NR ceramic possesses 9% porosity as opposed to only 2% porosity for the reaction sintered AlO-hBN.

Synthesis and Corrosion Resistance of FeMnNiAlC Multi-Principal Element Compound.

A multi-principal element FeMnNiAlC bulk alloy was produced by vacuum arc melting. The same alloy was sintered as a thin film on a silicon substrate by ion beam sputter deposition. The bulk alloy has a multiphase structure the elements predominantly segregating into iron manganese carbides and nickel aluminium phases.

[Congenital complete bony unilateral atresia of the left choana in a 30-year-old woman].

According to literature, the average age of children with unilateral atresia of the choan is six years nine months. Unilateral complete atresia of the choan makes it difficult to diagnose early: the initial diagnosis can be established in the second year of life and later, already at school age. In Russian and foreign literature in recent years, cases of diagnosing congenital atresia of choanomas in older children are known, the maximum age of children is 17-18 years, it is noted that such cases are very rare.

Deviating from the pure MAX phase concept: Radiation-tolerant nanostructured dual-phase CrAlC.

A dual-phase CrAlC material was synthesized using magnetron sputtering at a temperature of 648 K. A stoichiometric and nanocrystalline MAX phase matrix was observed along with the presence of spherical-shaped amorphous nano-zones as a secondary phase. The irradiation resistance of the material was assessed using a 300-keV Xe ion beam in situ within a transmission electron microscope up to 40 displacements per atom at 623 K: a condition that extrapolates the harmful environments of future fusion and fission nuclear reactors.

[Prevention and treatment of post-implantation maxillary sinusitis].

The state of the nasal cavity, especially the region of the osteomyomatic complex, plays a significant role in the development of chronic maxillary sinusitis. Odontogenic maxillary sinusitis, as a complication of dental implantological treatment on the upper jaw, is increasingly common. The aim of the study was to increase the effectiveness of prophylaxis and treatment of odontogenic purulent upper jaw sinusitis during reconstructive operations on the alveolar region of the upper jaw.

Timing of geological events in the lunar highlands recorded in shocked zircon-bearing clasts from Apollo 16.

Apollo 16 soil-like regolith breccia 65745,7 contains two zircon-bearing clasts. One of these clasts is a thermally annealed silica-rich rock, which mineralogically has affinities with the High Alkali Suite (Clast 1), and yields zircon dates ranging from 4.08 to 3.

Effect of aluminium concentration on phase formation and radiation stability of CrAl C thin film.

Near-stoichiometric and under-stoichiometric CrAl C (x = 0.9 and 0.75) amorphous compositions were deposited onto a silicon substrate at 330 K in a layer-by-layer fashion using magnetron sputtering from elemental targets.

Electromagnetically induced absorption scheme for vapor-cell atomic clock.

A dual-frequency light field scheme, composed of counterpropagating pump and probe light waves with equal circular polarizations and different intensities, is proposed for the detection of subnatural-linewidth electromagnetically induced absorption (EIA) resonances. In this scheme, the bright-type EIA resonance is obtained at fixed static magnetic field by tuning the frequency difference between both optical fields and can be used as a frequency reference in an atomic clock. Using a 5-mm long buffer-gas-filled Cs vapor cell, an EIA-based atomic clock with a short-term fractional frequency stability of 5.

[Improving the methods of diagnosis and treatment of otitis media with effusion].

The study involved 172 patients with otitis media with effusion. All patients as a method of early diagnosis of otitis media with effusion conducted multislice computer tomography (MSCT). This made it possible to check the effectiveness of conservative treatment and timely perform surgical treatment, including sanitizing intervention on the middle ear with the erased clinical picture of acute mastoiditis, and to avoid complications.

The endemic Cladophorales (Ulvophyceae) of ancient Lake Baikal represent a monophyletic group of very closely related but morphologically diverse species.

Lake Baikal, the oldest lake in the world, is home to spectacular biodiversity and extraordinary levels of endemism. While many of the animal species flocks from Lake Baikal are famous examples of evolutionary radiations, the lake also includes a wide diversity of endemic algae that are not well investigated with regards to molecular-biological taxonomy and phylogeny. The endemic taxa of the green algal order Cladophorales show a range of divergent morphologies that led to their classification in four genera in two families.

[The application of the modern high-energy laser technologies for the surgical treatment of the patients presenting with otosclerosis].

The objective of the present study was to determine the optimal parameters of radiation of the CO2 laser during the surgical intervention for the treatment of the patients presenting with otosclerosis. The experimental part of the study was carried out with the use of the isolated temporal bones. Under the clinical conditions, the patients with the tympanic and mixed forms of otosclerosis underwent stapedoplasty with the use of the CO2 laser.

[Comparative analysis of the effectiveness of bypass surgery and laser myringotomy used to treat exudative otitis medium].

The objective of the present study was the comparative analysis of the surgical method employed for the treatment of exudative otitis medium, such as bypass surgery and laser myringotomy. The study included 125 patients suffering from the said pathology. The following two methods were used in cases of poor efficiency of conservative therapy: laser myringotomy with the use of a LUMENISc CO2-laser operated at a wavelength of 10.

[PLAGUE IN MANCHURIA (1910-1911) AND EBOLA VIRUS DISEASE IN WEST AFRICA (2014-2015): COMMON PREREQUISITES FOR THE DEVELOPMENT OF EPIDEMICS].

The paper gives the results of a comparative analysis of the prerequisites for the emergence and spread of epidemics of particularly dangerous infections, by using plague in Manchuria (1910-1911) and Ebola virus disease in West Africa (2014-2015) as examples. Analysis of literature and archival data and online information could reveal a number of common factors and conditions, which substantially contributed to the epidemics. Organization of anti-epidemic (preventive) measures in cases of the threatening epidemic spread, of particularly dangerous diseases must be based on the minimization, of the influence of the specific factors and conditions, which facilitate disease transmission in a given area in a given time.

Chitin and Products of Its Hydrolysis in Vibrio cholerae Ecology.

The role of chitin and its hydrolysis products generated by Vibrio cholerae chitinases in mechanisms of its adaptation in water environments, metabolism, preservation, acquisition of pathogenic potential, and its epidemiological value are reviewed. Chitin utilization by V. cholerae as a source of energy, carbon, and nitrogen is described.

[The comparative analysis of the effectiveness of various forms of the surgical treatment of the patients presenting with chronic odontogenic maxillary sinusitis].

Unlabelled: The objective of the present study was to evaluate the clinical effectiveness of various forms of the surgical treatment of the patients presenting with chronic odontogenic maxillary sinusitis (COMS) with special reference to its long-term

Results: The secondary objective was to assess the quality of life of such patients during the postoperative period. The study included 107 patients divided into two groups. The patients of group 1 (n=32) underwent radical operation on the maxillary sinuses (MS) as described by Caldwell and Luc.

Hydrogenation of Graphene by Reaction at High Pressure and High Temperature.

The chemical reaction between hydrogen and purely sp(2)-bonded graphene to form graphene's purely sp(3)-bonded analogue, graphane, potentially allows the synthesis of a much wider variety of novel two-dimensional materials by opening a pathway to the application of conventional chemistry methods in graphene. Graphene is currently hydrogenated by exposure to atomic hydrogen in a vacuum, but these methods have not yielded a complete conversion of graphene to graphane, even with graphene exposed to hydrogen on both sides of the lattice. By heating graphene in molecular hydrogen under compression to modest high pressure in a diamond anvil cell (2.

Laboratory evaluation of Drawtex Hydroconductive dressing with LevaFiber technology.

Objective: The aim of this study was to assess absorption, sequestration and retention of microorganisms by Drawtex Hydroconductive dressing with LevaFiberTM technology.

Method: The absorption over time and the ability to sequester and retain bacteria were assessed in the laboratory using an in vitro model where known amounts of fluid and microorganisms were allowed to absorb and sequester over a 24 hour period. The reduction in numbers of microorganisms following sequestration was determined using standard plate counting methods.

The optimisation of facile substrates for surface enhanced Raman scattering through galvanic replacement of silver onto copper.

A fast and cost-effective approach for the synthesis of substrates used in surface enhanced Raman scattering (SERS) has been developed using galvanic displacement. Deposition of silver onto commercially available Cu foil has resulted in the formation of multiple hierarchical structures, whose morphology show dependence on deposition time and temperature. Analysis of the surface structure by scanning electron microscopy revealed that the more complex silver structures correlated well with increased deposition time and temperature.

Charging of dust in thermal collisional plasmas.

Thermal strongly collisional dusty plasma is studied. The electrical neutrality of the plasma suggests that the gas phase has some electrostatic energy when the plasma contains charged dust grains. The value of this energy determines the interphase interaction and ionization balance in the plasma.

New Measurement of the π0 radiative decay width.

High precision measurements of the differential cross sections for π0 photoproduction at forward angles for two nuclei, 12C and 208Pb, have been performed for incident photon energies of 4.9-5.5 GeV to extract the π0→γγ decay width.

Composition of smoke generated by landing aircraft.

A combination of techniques has been used to examine the composition of smoke generated by landing aircraft. A sample of dust from the undercarriage from several commercial airliners was examined with SEM/EDX (Scanning Electron Microscope/Energy Dispersive X-ray) to determine its elemental composition and also with an aerosizer/aerodisperser in order to measure the particle size spectrum. The observed size spectrum was bimodal with equal numbers of particles at peaks of aerodynamic diameter ∼10 μm and ∼50 μm.