The genus Chondrilla L. comprises 22 species on the CIS territory. 16 species of them grow in Kazakhstan. All species of the genus Chondrilla L. are rubber-bearing herbaceous plants that belong to the Asteraceae family. We picked Chondrilla brevirostris Fisch. & C.A. Mey. for the chemical study. It is a perennial herb that grows in desert steppes and forest meadows. The ...

The vibrational and electronic properties of several basic radiation defects in potassium bromide are computed at the quantum mechanical level using a periodic supercell approach based on hybrid functionals, an all-electron Gaussian-type basis set, and the CRYSTALcomputer code. The exciton energy in alkali halides is sufficient to create lattice defects, such as F–H Frenkel ...

It is shown that the inflationary model is the result of the symmetry of the generalized F(R, T, X, ϕ)-cosmological model using the Noether symmetry. It leads to a solution, a particular case of which is Starobinsky’s cosmological model. It is shown that even in the more particular case of cosmological models F(R, X, ϕ) and F(T, X, ϕ) the Monge–Ampère equation is still obtained, ...

The key aim of this paper is to study the presence effect of LiO impurity phases in Li2ZrO3 ceramics on the resistance to helium swelling and structural degradation during implanted helium accumulation in the near-surface layer structure. The hypothesis put forward is based on a number of scientific papers, in which it was reported that the presence of two or more phases in ...

The direction of organic electronics research is attracting more and more interest from the scientific community. One of the indicators of such interest is the appearance of commercially available products with screens based on organic compounds. Therefore, conducting experimental and theoretical research in this area is an urgent task. Pentacoordination neutral complexes of ...

Nanoporous track-etched membranes (TeMs) are highly versatile materials that have shown promise in various applications such as filtration, separation, adsorption, and catalysis due to their mechanical integrity and high surface area. The performance of TeMs as catalysts for removing toxic pollutants is greatly influenced by the pore diameter, density, and functionalization ...

/e emergence of the COVID-19 pandemic declared the huge need of humanity for new and effective antiviral drugs. /e reported antimicrobial activities of Artemisia sublessingiana encouraged us to investigate the ethanol extract of its aerial parts which led to the isolation of six flavonoids and a sesquiterpenoid. /e structures of the isolated compounds were elucidated by EI-MS, ...

Silicon nitride, silicon oxide, and silicon oxynitride thin films were deposited on the Si substrate by inductively coupled plasma chemical vapor deposition and annealed at 1100 °C for 3 min in an Ar environment. Silicon nitride and silicon oxide films deposited at ratios of the reactant flow rates of SiH4/N2 = 1.875 and SiH4/N2O = 3, respectively, were Si-rich, while Si excess ...

The biologically active coumarins from Ferula L. species of the family Apiaceae Lindl. for the period 1970 to 2022 have been reviewed. The phytochemical investigation of different parts of Ferula L., including gum resin, leaves, fruits, seeds, roots, rhizomes, and resins led to the separation of different types of coumarins. Nearly 185 coumarins were isolated from 35 species ...

This work is dedicated to the study of the properties of perovskite ceramics based on lanthanum–strontium ferrite, and to the evaluation of their resistance to long-term thermal aging. As a method for obtaining perovskite ceramics, the method of solid-phase mechanochemical grinding and consequent thermal annealing of the resulting mixtures was chosen. The novelty of the study ...