Glycerol Oligomerization over Titania-Based Catalyst Compositions.

The possibility of using TiO -based compositions: individual and sulfated titania, and their composites with carbon nanotubes as catalysts for glycerol oligomerization has been displayed. The effect of modification of TiO with sulfur and carbon nanotubes on acid-base and catalytic characteristics in the glycerol conversion was investigated. The activation of glycerol on the catalysts has been studied using attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy.

MATHEMATICAL MODEL FOR PREDICTING FASTING BLOOD GLUCOSE LEVEL IN DIABETES MELLITUS PATIENTS.

Objective: The aim: To substantiate the use of data on patients' lifestyle, parameters of blood glucose, heart rate, blood pressure and bread units to build a mathematical model for predicting fasting blood glucose level in diabetes mellitus patients to improve existing measures for diabetes prevention.

Patients And Methods: Materials and methods: An open database consisting of the studied parameters of 359 people was used in the research. The linear regression method was used to predict fasting blood glucose level in diabetes mellitus patients.

Carbon dioxide capture from air leading to bis-[-(5-methyl-1-pyrazol-3-yl-κ)carbamato-κ]copper(II) tetra-hydrate.

A mononuclear square-planar Cu complex of (5-methyl-1-pyrazol-3-yl)carbamate, [Cu(CHNO)]·4HO, was synthesized using a one-pot reaction from 5-methyl-3-pyrazolamine and copper(II) acetate in water under ambient conditions. The adsorption of carbon dioxide from air was facilitated by the addition of di-ethano-lamine to the reaction mixture. While di-ethano-lamine is not a component of the final product, it plays a pivotal role in the reaction by creating an alkaline environment, thereby enabling the adsorption of atmos-pheric carbon dioxide.

Hierarchical Structuring of Black Silicon Wafers by Ion-Flow-Stimulated Roughening Transition: Fundamentals and Applications for Photovoltaics.

Ion-flow-stimulated roughening transition is a phenomenon that may prove useful in the hierarchical structuring of nanostructures. In this work, we have investigated theoretically and experimentally the surface texturing of single-crystal and multi-crystalline silicon wafers irradiated using ion-beam flows. In contrast to previous studies, ions had relatively low energies, whereas flow densities were high enough to induce a quasi-liquid state in the upper silicon layers.

Determination of regularities that influence the acoustic pressure and accuracy of inertial sensors.

This study investigated the influence of high-intensity acoustic radiation on the elements of a navigation system, namely, the angular velocity sensor DUSU-2AS. The measurement error of the device under the influence of acoustic pressure is determined. High-intensity acoustic radiation causes measurement errors that are greater than the sensitivity threshold of the device.

Optical Properties of Light-Scattering Standards for CCD Photometry.

This paper analyzes the light-scattering standards currently used for calibration (verification) and systematic research in photo and spectrophotometry tools. The application specificities in studying the diffuse reflected and transmitted light during biomedical CCD photometry are considered. The advantages of a new class of photometers with non-spherical reflectors as ellipsoids of revolution truncated along the focal planes with the internal mirror surface are presented.

The diversity of isofrequency surface topologies in a hypercrystal composed of ferrite- and semiconductor-based metamaterials.

Recent studies have centered on the potential for effectively controlling the topology state of iso-frequency surfaces in artificial photonic structures using external fields. This paper delves into the topological transitions and singularity states of the isofrequency surface of a highly anisotropic superlattice. This superlattice is composed of alternating layers of ferrite-dielectric and semiconductor-dielectric metamaterials.

Multigram Synthesis of Dimethyl Stellane-1,5-Dicarboxylate as a Key Precursor for ortho-Benzene Mimics.

Herein, we present previously unavailable C(sp )-rich polycyclic hydrocarbon scaffolds that have the potential to become valuable tools in medicinal chemistry and crop science as saturated bioisosteres of benzenoids. We have developed a scalable protocol (up to 50 g from a single synthetic run) for the synthesis of tricyclo[3.3.

Endemic characteristics of SARS-CoV-2 infection.

The fourth year of the COVID-19 pandemic without decreasing trends in the global numbers of new daily cases, high numbers of circulating SARS-CoV-2 variants and re-infections together with pessimistic predictions for the Omicron wave duration force studies about the endemic stage of the disease. The global trends were illustrated with the use the accumulated numbers of laboratory-confirmed COVID-19 cases and deaths, the percentages of fully vaccinated people and boosters (additional vaccinations), and the results of calculation of the effective reproduction number provided by Johns Hopkins University. A new modified SIR model with re-infections was proposed and analyzed.

Improvement of the software for modeling the dynamics of epidemics and developing a user-friendly interface.

The challenges humanity is facing due to the Covid-19 pandemic require timely and accurate forecasting of the dynamics of various epidemics to minimize the negative consequences for public health and the economy. One can use a variety of well-known and new mathematical models, taking into account a huge number of factors. However, complex models contain a large number of unknown parameters, the values of which must be determined using a limited number of observations, e.

DYNAMICS OF STUDENTS' PHYSICAL WELL-BEING INDICATORS DURING QUARANTINE RESTRICTIONS.

Objective: The aim: To study the dynamics of students' physical well-being and physical fitness during the quarantine restrictions caused by the COVID-19 pandemic.

Patients And Methods: Materials and methods: The research involved 263 students (148 men and 115 women) aged 18-20. Depending on the volume of physical activity performed by students during quarantine restrictions, they were divided into three groups (with sufficient, high, and low volume).

IMPACT OF MOTOR ACTIVITY ON THE DYNAMICS OF INTELLECTUAL WORKING CAPACITY AND MENTAL COGNITIVE PROCESSES IN STUDENTS.

Objective: The aim: To study the impact of physical exercises of different intensity on the dynamics of intellectual working capacity and mental cognitive processes in students.

Patients And Methods: Materials and methods: The research involved 293 students. The research was conducted in 2 stages.

Straightforward Synthesis of Halopyridine Aldehydes via Diaminomethylation.

A novel two-step method for formylation of fluoropyridines with silylformamidine Me SiC(=NMe)NMe (1) under catalyst-free conditions was developed. A series of all possible 18 fluoropyridines featuring one to four fluorine atoms were subjected to the reaction with 1 existing in equilibrium with its carbenic form Me NC(:)N(Me)SiMe (1'). Among them, 12 fluoropyridines were shown to react via C-H insertion.

Study of heat and mass transfer processes during extraction of plant raw materials under the influence of ultrasound.

Theoretical analysis of the process of biologically active substances (BAS) extraction from plant raw materials in conditions of ultrasonic action and without it to describe the kinetics of the process has been conducted. A mathematical model of the process of BAS extraction from plant raw materials to establish the dependence of changes in the concentration of BAS in the volume of cells in the intercellular space and in the main volume of the extractant has been developed. On the basis of the solution of the mathematical model the duration of the model of BAS extraction process from plant raw materials has been established, results show that the duration of the process of extraction of oil from plant raw materials in an acoustic extractor decreases by 1.

ASSESSMENT OF THE CONSEQUENCES OF THE DETERIORATION OF THE EPIDEMIOLOGICAL SITUATION DURING HOSTILITIES.

Objective: The aim: Scientific substantiation of the methodology for predicting the consequences of the worsening of the epidemic situation on the territory of Ukraine during military operations for the timely adoption of measures for the medical protection of military personnel in conditions of biological contamination.

Patients And Methods: Materials and methods: Determination and generalization of the impact of biological contamination due to the use of biological weapons were carried out considering the main determinants of the epidemic process using the index and coefficient of medical protection. Applied methods of scientific research: epidemiological, system, and information approach.

Online education of engineering students: Educational platforms and their influence on the level of academic performance.

The World Health Organization announced the COVID-19 pandemic, which led to considerable disruption of the global education system and required an early adaptation of the educational process. In addition to the resumption of the educational process, it was necessary to preserve the academic performance of students of higher educational institutions, including engineering ones. This study aims to develop a curriculum for engineering students to increase their level of success.

Long but Strong C-C Single Bonds: Challenges for Theory.

Theoretical challenges in describing molecules with anomalously long single C-C bonds are analyzed in terms of the relative contributions of stabilizing and destabilizing intramolecular interactions. Diamondoid dimers that are stable despite the presence of C-C bonds up to 1.7 Å long, as well as other bulky molecules stabilized due to intramolecular noncovalent interactions (London dispersions) are discussed.

New Polymorphic Modifications of 6-Methyluracil: An Experimental and Quantum Chemical Study.

Polymorphism of 6-methyluracil, which affects the regulation of lipid peroxidation and wound healing, has been studied by experimental and quantum chemical methods. Two known polymorphic modifications and two new crystalline forms were crystallized and characterized by single crystal and powder X-ray diffraction (XRD) methods as well as by the differential scanning calorimetry (DSC) method and infrared (IR) spectroscopy. The calculations of pairwise interaction energies between molecules and lattice energies in periodic boundary conditions have shown that the polymorphic form used in the pharmaceutical industry and two new forms and , which can be formed due to temperature violations, may be considered as metastable.

Peculiarities of Fatigue Crack Growth in Steel 17H1S after Long-Term Operations on a Gas Pipeline.

This work presents the results of metallographic studies and the tensile, impact, and fatigue crack growth (FCG) resistance tests of 17H1S main gas pipeline steel in the as-received (AR) state and after a long-term operation (LTO). A significant number of non-metallic inclusions forming chains stretched along the direction of pipe rolling were found in the microstructure of the LTO steel. The lowest values of elongation at break and impact toughness of the steel were determined for the lower part of the pipe close to its inner surface.

Spatial antiferromagnetic spin texture as a nano-oscillator.

We report a theoretical study of the localized spatial magnetization configuration, which is a confined spin configuration of the target skyrmion/hopfion type in an antiferromagnet with perpendicular magnetic anisotropy, and then we solve the particular problem of self-oscillations of such a topological spin texture. Using the energy approach, a self-consistent account of inhomogeneity of the characteristics of the topological magnetic spin texture was carried out. On this basis, the equation of free oscillations of the confined spin configuration magnetization was derived and its quasi-classical solution was found.

Negative and positive allosteric modulators of the α7 nicotinic acetylcholine receptor regulates the ability of adolescent binge alcohol exposure to enhance adult alcohol consumption.

Ethanol acts directly on the α7 Nicotinic acetylcholine receptor (α7). Adolescent-binge alcohol exposure (ABAE) produces deleterious consequences during adulthood, and data indicate that the α7 receptor regulates these damaging events. Administration of an α7 Negative Allosteric Modulator (NAM) or the cholinesterase inhibitor galantamine can prophylactically prevent adult consequences of ABAE.

Radiothermal Emission of Nanoparticles with a Complex Shape as a Tool for the Quality Control of Pharmaceuticals Containing Biologically Active Nanoparticles.

It has recently been shown that the titer of the SARS-CoV-2 virus decreases in a cell culture when the cell suspension is irradiated with electromagnetic waves at a frequency of 95 GHz. We assumed that a frequency range in the gigahertz and sub-terahertz ranges was one of the key aspects in the "tuning" of flickering dipoles in the dispersion interaction process of the surfaces of supramolecular structures. To verify this assumption, the intrinsic thermal radio emission in the gigahertz range of the following nanoparticles was studied: virus-like particles (VLP) of SARS-CoV-2 and rotavirus A, monoclonal antibodies to various RBD epitopes of SARS-CoV-2, interferon-α, antibodies to interferon-γ, humic-fulvic acids, and silver proteinate.

Polyacrylamide Hydrogel Enriched with Amber for In Vitro Plant Rooting.

In this work, a new material for in vitro plant rooting based on highly dispersed polyacrylamide hydrogel (PAAG) enriched with amber powder was synthesized and investigated. PAAG was synthesized by homophase radical polymerization with ground amber addition. Fourier transform infrared spectroscopy (FTIR) and rheological studies were used to characterize the materials.

RADIOSURGICAL TREATMENT OF RECURRENT GLIOBLASTOMA AND PROGNOSTIC FACTORS AFFECTING TREATMENT OUTCOMES.

Background: Glioblastoma (GBM) is the most prevalent malignant tumor of the brain in adults with the inherent aggressive behavior and high recurrence rate. The stereotactic radiosurgery (SRS) is currently considered as one of the effective modalities for GBM treatment allowing for the improvement of survival with the acceptable toxicity level.

Aim: To assess the effects of various factors on the survival of GBM patients following SRS.