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Background. Modification of biologically active compounds of natural origin in order to obtain new analogs with targeted action, a high degree of safety and tolerability is one of the priority areas of pharmaceutical, bioorganic and medicinal chemistry. Purpose. Molecular design and synthesis of new derivatives, analogues of 18β-H-GlA with organic polyfunctional pharmacophore ligands containing electron-donor and acceptor atoms and groups, their in silica docking in relation to the viral protease (Mpro) SARS-CoV-2. Methodology. Extraction, isolation, purification, hydrolysis, oxidation and transformation of 18β-HGlA and 3,11-dioxo-18β-H-GlA. Originality. Online software CB-Dock2 calculated molecular docking structures with Mpro SARSCoV-2, showing that 18β-H-GlK derivatives can inhibit the virus reproduction function by interfering with the activity of its 3CL protease. 4 new derivatives of 18β-H-GlA were synthesized, the novelty of the substances was confirmed using the SciFinder database, the yield of the target products was 75-90%. Findings. Modeling of the molecular docking of the proposed structures with the active center of Mpro SARS-CoV-2 showed the formation of two or more donor-acceptor hydrogen bonds with an energy of -8.2 kcal/mol and molecular proximity within 2 Ǻ. The structure of the synthesized substances was confirmed by optical spectroscopy (IR-; UV-) and mass spectrometry. [ABSTRACT FROM AUTHOR]

Background. Menthol is used in chemistry and pharmaceuticals. Understanding its structure and properties is revealed by the quantum-chemical method. Purpose. To study the properties of menthol by the quantum-chemical method. Methodology. Quantum-chemical calculations using the Gaussian 09 software package and the 3-21G, 6-31G and 6-311G basis sets. The DFT, Unrestricted and B3LYP methods, Avogadro 1.2.0 and GaussView 6.0.16 programs were used. Originality. For the first time, the structural and electronic properties of menthol, previously unknown features of the molecular structure of menthol have been revealed, which opens up prospects for its wider use. Findings. - bond length, charge distribution in the menthol molecule; - molecular orbital analysis (HOMO), (LUMO); - electrostatic potential of menthol. [ABSTRACT FROM AUTHOR]

The effect of chemical structure of low molecular weight plasticizers (LMWP) on intermolecular interactions and mechanical properties of nanostructured polyurethane elastomer (PU)/polyvinyl chloride (PVC) blends was investigated. Polymer composite films were prepared by solution casting technique using dimethylformamide (DMF) or by rolling the melt. FTIR data showed a maximum level of intermolecular hydrogen bond degradation for PU or the polymer blend modified with trichloroethyl phosphate (TCEP) due to the formation of H-bonds between NH of rigid urethane/ urea fragments of PU elastomer and chlorine of TCEP. The low compatibility of di-(2-ethylhexyl)-o-phthalate (DOP), compared with di-n-butyl-o-phthalate (DBP), and PU elastomer provided a minor effect of plasticizer on intramolecular and interfacial interactions in PU or polymer blend. The resulting composites are characterized by increased tensile strength in the whole composition range. The results of DSC analysis of melt-rolled blends of PU/PVC modified by DOP had one wide glass relaxation transition range and their thermal and mechanical properties could be controlled by changing the ratio of initial components. The aforementioned results provide new possibilities of manufacturing the novel nanostructured thermoplastic elastomers with improved mechanical properties. [ABSTRACT FROM AUTHOR]

Polyelectrolyte complexes (PECs) based on sodium alginate (SA) with polyethyleneimine (PEI) were synthesized at a molar ratio of SA:PEI = 1.00:0.25 (PEC-1) and SA:PEI = 1.0:0.5 (PEC-2). The temperature intervals of thermodegradation for both the initial components and PECs were determined by pyrolytic mass spectrometry. It was shown that the molar ratio in these PECs significantly affects their swelling level in an aqueous environment as well as their mechanical characteristics. For instance, PEC-2 film is stiffer and more brittle compared to PEC-1 film, which retains flexibility. It has been revealed that PEC-2 exhibits a lower total ionic current of volatile components and a smaller number of ionic fragments generated during pyrolysis across the entire temperature range compared to PEC-1. In other words, PEC-2 is more resistant to temperature impact than PEC-1, which can be attributed to the difference in the molecular structure of the PECs. The formation of a greater number of ionic and hydrogen bonds in PEC-2, in our opinion, results in the formation of a stiffer and more ordered structure (compared to PEC-1). It is worth noting that the composition of PEC-2 is closer to stoichiometric, which leads to a decrease in the swelling degree of its film in water, and a decrease in its elasticity. [ABSTRACT FROM AUTHOR]

Objectives. The study set out to determine the equilibrium parameters of the 3,4-dicyanofuroxan molecule by means of molecule geometry optimization by quantum chemistry methods, verify the adequacy of the methods used, and compare the obtained results with X-ray diffraction analysis (XRD) and gas electron diffraction (GED) data.Methods. Quantum chemical calculations were carried out using B3LYP, MP2, and CCSD(T) methods with 6-31G(d,p), cc-pVTZ, and aug-cc-pVTZ basis sets.Results. The equilibrium molecular structure of 3,4-dicyanofuroxan was refined by means of quantum chemical calculations using the Gaussian09 program. The geometrical parameters were compared with the structure of this compound in the solid phase and a number of related compounds in gas and solid phases. It was theoretically established that the planar equilibrium structure of the dicyanofuroxan molecule has CS symmetry. The structure of the free dicyanofuroxan molecule was found to differ depending on the phase. The B3LYP and CCSD(T) methods describe the molecular structure of dicyanofuroxan more accurately than the MP2 method. A regularity was revealed, according to which an increase in the basis, as a rule, leads to a better agreement of the geometry, regardless of the functional.Conclusions. The calculations performed are in good agreement with the literature data and results of joint analysis by GED and XRD. The effect of cyano substituents on the ring geometry is observed in comparison with the literature data for the dicyanofuroxan molecule. For the molecule in question, it is better to use the B3LYP/aug-cc-pVTZ method. The values of geometric parameters obtained by this method are in better agreement with the structure in the gas phase. The discrepancies with the experimental XRD results may be due to interactions in the crystal structure. Differences in the geometric parameters obtained on the basis of different functionals and bases make this molecule interesting for experimental structural studies using GED or microwave spectroscopy, which will permit the identification of optimal methods and bases for obtaining the geometric parameters of furoxan class molecules.

Background. The creation of safe and highly effective drugs in pharmacology is relevant. These include the bactericidal norfloxacin, from the group of fluoroquinolones. It is used for infections of the prostate, digestive and urinary systems. Work is underway to synthesize new compounds based on it. Purpose: synthesis of a new biologically active compound - a metal complex with norfloxacin, determination of its structure. Methodology. The method of X-ray crystallography (Xcalibur R Oxford Diffraction diffractometer) at room temperature and IR spectroscopy (IRTracer-100 from Shimadzu, Japan) were used. Originality. The crystal structure and molecular characteristics of a new mixed-ligand complex were obtained for the first time. Findings. A new mixed-ligand complex [Co(HL)2(H2O)2](CH3COO)Cl(H2O)2 was obtained, and its molecular characteristics and crystal structure were determined by X-ray crystallography. [ABSTRACT FROM AUTHOR]

It is known that products made of polar, crystallized, and high-strength polymers (polyamides, polyesters, cellulose triacetate, polyvinyl chloride, etc.) lose their initial properties that reduce reliability and durability in the process of operation and even during long-term storage due to the increase in internal stresses in them caused by crystallization processes over time. To reduce the impact of such processes on the properties of polymer products, special substances are introduced into their composition, plasticizers, the selection of which is usually carried out empirically, which is not always successful. We proposed in this study to use the ratio of the calculated total molar volumetric energy of cohesion of the compound (the cumulative interaction of interatomic and intermolecular forces in the composition of the compound) to its molecular weight as the specific mass total energy of cohesion, which can be compared with a similar indicator for a plasticizing polymer. The use of such an approach makes it possible to purposefully, even before experimental verification, evaluate the suitability of using this or that compound, oligomer, or polymer as a plasticizer (or modifier), or develop a molecular structure of a new, necessary compound with the inclusion of certain groups in its composition for the purpose of further use as a plasticizer or modifier. In addition, there is an opportunity to monitor the influence of individual structural components of a new compound, oligomer or polymer, its molecular weight, side substituents and their nature on the value of the specific mass total energy of cohesion, as well as to reduce the time for performing research works in this direction and expenses for their implementation. [ABSTRACT FROM AUTHOR]

The article is dedicated to the 125th birthday of Yakov Kivovich Syrkin - Academician, Doctor of Chemical Sciences, Professor, Laureate of the Stalin Prize, and founder of the school of quantum chemistry in Russia. He was the head of the departments of Physical Chemistry at the M. V. Lomonosov Moscow Institute of Fine Chemical Technology and of Simple and Complex Compounds at the N.S. Kurnakov Institute of General and Inorganic Chemistry of the USSR Academy of Sciences, and the Laboratory of the Structure of Molecules at the L.Ya. Karpov Institute of Physical Chemistry. Yakov Syrkin was a world-famous scientist in the field of physical chemistry, who has addressed many issues of quantum chemistry, molecules structure, chemical bonds; the mechanism of chemical reactions, kinetics and catalysis. He was a brilliant teacher and lecturer, the initiator of many scientific ideas and directions, the author of more than five hundred scientific works, a responsive man of many talents. The chronological outline of his scientific, pedagogical and life path is presented, some less well-known fa.cts about his biography has also been highlighted.

Materials and methods. 285 Russian patients with amyotrophic lateral sclerosis (ALS) including 260 patients with a sporadic form and 25 with a familial form were examined for mutations in SOD1, C9orf72, TARDBP, ANG and other genes and the presence of associations among polymorphic sites in ATXN2 (polyCAG) and VEGF (-2578С/А) genes.Molecular genetic analysis was performed using direct sequencing, fragment analysis and real-time polymerase chain reaction. On the last stage, rare ALS candidate genes were evaluated using a next generation sequencing (NGS) panel.Results. Total rate of the identified mutations in the examined ALS cohort was 9.5 %. The most frequently observed defects were mutations in the SOD1 (24.0 % in familial ALS and 4.6 % in sporadic ALS) and C9orf72 (pathological hexanucleotide repeat expansion was identified in 1.8 % cases of ALS, all sporadic) genes. The TARDBP gene didn’t contain any mutations, though in the ALS group deletion c.715-126delG located in intron 5 of the TARDBP gene was significantly over-represented – 38.0 % vs. 26.6 % (χ2 = 13.17; р = 0.002). Mutations in the ANG gene were identified in 1.05 % of ALS patients (all cases were sporadic). In 1 (0.35 %) sporadic case a G1082A mutation in the DCTN1 gene was identified. The examined group significantly more frequently carried a risk allele of the ATXN2 gene with an “intermediate” (28–33) number of CAG repeats – 5.0 % vs. 1.7 % in the control group (χ2 = 3.89; р = 0.0486). In Russian ALS patients, an association between the disease and the presence of a risk А-allele and homozygote genotype А/А of -2578С/А polymorphism in the VEGF gene was identified (χ2 = 7.14; р = 0.008 and χ2 = 13.46; р = 0.001 for the rates in the ALS population and in the control population, respectively), which is confirmed by the odds ratio.Conclusion. In the current article, molecular structure of ALS in the Russian population was examined, rates of individual genetic forms and mutation spectrum were established. This work is of considerable significance for medical genetic counseling and prevention of the disease in the affected families.

An influence of the substrate temperature in the range of 40-400 °C on the properties of the Si-C-N films deposited by plasma enhanced chemical vapor deposition (PECVD) technique using hexamethyldisilazane is analyzed. Study of the structure, chemical bonding, surface morphology, mechanical properties and energy gap of the obtained films was carried out using X-ray diffraction, infrared spectroscopy, X-ray photoelectron spectroscopy, atomic force microscopy, optical measurements and nanoindentation. It was established that all the films were X-ray amorphous and had low surface roughness. Intensive hydrogen effusion from the films takes place, when substrate temperature increases up to 400 °C, which promotes a decrease of roughness and an increase in hardness and Young modules more than twice. [ABSTRACT FROM AUTHOR]

In most cases, it is impossible to study and describe the structure and properties of samples using a single method. That is why in our studies two research methods were used and compared – X-Ray diffraction (XRD) and scanning electron microscopy (SEM) with electron diffraction (ED). Each method has certain advantages. In the case of the XRD – usability and more complex evaluation of the sample structural parameters. The advantages of the second one are the direct estimation of nanoparticle sizes and insignificant amount of the sample needed for the analysis. The main direction of our work is the studies and the analysis of the structural and substructural parameters of composite biomaterials based on an apatite and presented in the shape of fine-dispersed powders, pastes and gels. Certain dependences of the sample structure and substructure on the initial agents and synthesis conditions were determined. [ABSTRACT FROM AUTHOR]

The mathematical model of the heat transfer process based on the structural unit method is proposed. Calculation results of the model equations of thermodynamic characteristics of structural unit for solids are represented. [ABSTRACT FROM AUTHOR]

The liver plays an astonishing array of vital functions in the maintenance, performance and regulating homeostasis of the body. It is involved with almost all the biochemical pathways to growth, fight against disease, nutrient supply, energy provision and reproduction. Hepatotoxicity implies chemical-driven liver damage. Certain medicinal agents, when taken in overdoses and sometimes even when introduced within therapeutic ranges, may injure the organ. Chemicals that cause liver injure are called hepatotoxins. Drugs are an important cause liver injury. The aim of the study was to present and analyze the molecular mechanisms of hepatotoxicity for some structurally diverse drugs. Based on the analysis, may be identified and summarized typical molecular structures of different classes of drugs that can determine the processes of hepatic impairment. The information on the structural groups and mechanisms can be used to predict the potential hepatotoxic effects of new drugs. [ABSTRACT FROM AUTHOR]

The theoretical and experimental studies of relaxation of the methylene blue molecules (MB) out of the highly excited states have allowed to show the existence of nonbinding potential surfaces, which correspond to excited σσS" and σσN" states, which leads to bond dissociation S-C and N-C, localized in the vicinity of the symmetry axis of the MB molecule; the electron transfer from the highly excited σσS"-state of MB on the matrix causes the appearance of dication MBNH2+ typical for acidified (pH < 1) aqueous solutions of MB; two-quantum excitation of MB by light with hv < E(σσS") leads to phototransfer electron and hydrogen atom from matrix onto MB and the formation of the leuco form of dye MBNH. [ABSTRACT FROM AUTHOR]

Quantitative "structure - activity" relationships including quantum-chemical descriptors of the molecular structure are found for equilibrium partitioning of volatile impurities between components of the atmospheric aerosols and gas phase. The tendencies are found for increase in the uptake coefficient of the impurities with aerosol components, γ, as the index of global electrophilicity for the impurity, ω, grows. On the other hand, the γ values grow as the ω values calculated for the components of mineral aerosol surfaces are dropped. The obtained dependencies between γ and ω are related to the effect of ω index for reactants on the intrinsic barrier of transformations. [ABSTRACT FROM AUTHOR]

Structure, specific capacity, heatproof and thermal expansion of filled polyepoxy have been studied by FTIR--spectroscopy, DSC and Thermo mechanicals methods. Was established, that due to chemical building of PAn it have capacity to phase compatibility with different nature. Usege of external physical fields permit to create of composites with forecast thermophysical and thermomechanical properties. Suggest definition of phenomena relaxational structure. [ABSTRACT FROM AUTHOR]

Hyperbranched polyetherurethanes were synthesized by the reaction of Hyperbranched aliphatic polyeterpolyols of three generation and isocianate forpolymers. Synthesized polymers were characterisated by the method of IK-spectrums, IPS-chromatography, different scanning calorimetric. That were found that the urethanes fragments in the chain lead to the microgeterogenic structure of hyperbranched polymers. [ABSTRACT FROM AUTHOR]

Structural features have been studied of epoxy compositions with grafted bibasic carbonic acids. The maximum structural changes as compared with initial oligomer occur in epoxy composition with citric acid, and the minimal structural changes occur in composition with oxalic acid. The decreasing of intensity of crystal reflexes typical to carbonic acids relates to partial amorphization of acid molecules as a result of covalent binding between acid and epoxy functional groups. [ABSTRACT FROM AUTHOR]

Structure and percolative properties of composites based on polyvinyliden fluoride (PVDF) and its mixtures with polyaniline (PANI), doped with p-toluenesulfonic acid (TSA) was investigated by the methods of X-ray analysis, differential scanning calorimetry and impedance spectroscopy. It was shown, that descriptions of such compositions substantially depend on content of PANI-TSA and on the method of their preparation. It was established, that systems PVDF-PANI-TSA show a percolation behavior with low percolation threshold Cc H" 4%. The decrease of the crystallinity of PVDF-PANI-TSA systems specifies the mobility decrease of polymer chains of PVDF in the boundary layer around particles PANI-TSA. The investigated system is incompatible, that results in a segregation PANI-TSA in a separate phase. [ABSTRACT FROM AUTHOR]

The development, structure and properties of polymer electrolytes were discussed in the review. The special attention was spared to the influence of fillers on structural descriptions, electric and thermophysical properties of nanocomposite polymer electrolytes. The data of conductivity and temperatures of transitions for the described systems were cited. [ABSTRACT FROM AUTHOR]

Structural studies of original and functionalized copolymers of ethylene and vinyl acetate and compositions based on them containing crumb rubber by IR-spectroscopy, X-ray analysis and DSC were carried out. It was shown that vinyl acetate content affects on structuring of the copolymers and their physical and chemical properties. Filling the copolymer rubber crumb did not significantly affect on structuring of polymer matrix and leads to a decrease in mechanical properties. [ABSTRACT FROM AUTHOR]

Polyimide nanocomposites were synthesized by in situ polymerization using 4,4'- diaminodiphenylmethane, pyromellitic dianhydride, carbon nanotubes. The structure of polyimide nanocomposites were studied using SAXS method. It was established reversibility of contrast structure at contents of CNT above percolation threshold. [ABSTRACT FROM AUTHOR]

The teplophysical properties of the polyetheruretaneureas, which were synthesized by the reaction of urethane forpolymers and aminocontaining oligoethers with terminal aminogroups at the various rations of initional components were investigated. That were found that the teplophysical characteristics of polyetheruretaneureas depends on the type of initial amine and molecular weight of aminocontaining oligoether. [ABSTRACT FROM AUTHOR]

The effect of intramolecular interaction of PAAm-b-PEO-b-PAAm triblock copolymers (TBC) on a bulk structure state by WAXS and SAXS methods was studied. The IntraPC formation in TBC macromolecules prevents the PEO crystallization and ensures with existence of the homogeneous fractally-organized amorphous structure at a molecular weight variation in a wide range of both blocks. At the same time, a structural homogeneity of TBC broke at MvPEO ≥4⋅104 because a partial crystallization of PEO and a microphase separation in amorphous regions. [ABSTRACT FROM AUTHOR]

Macrochains dynamic and structural peculiarities of the nanocomposites based on polyimide and tetraethoxysilane were studied using EPR and optical microscopy. Analysis of rotational diffusion of the nitroxyl spin probe TEMPO reveals that introduction of inorganic component into the polyimide matrix leads to decreasing of its mobility in all cases. According to optical microscopy data introduction of tetraethoxysilane into polyimide is accompanied with formation of inhomogeneities in the system. Their number and size mean value depends on inorganic component content. [ABSTRACT FROM AUTHOR]

Recent literature data on investigation of structure and properties of porous film materials, including thermostable ones, based on synthetic polymers have been generalized and systematized. Modern classification of porous polymer materials and methods of investigation of their porous structure have been presented. [ABSTRACT FROM AUTHOR]

This paper studies the influence of promoting admixtures of the Cs formiate on the catalyst activity, selectivity, stability, crystal structure and morphology of Cu-Zn-Al catalyst of low-temperature CO conversion. We test two methods of introducing the promoter, notably into the calcinated as well as into the carbonate catalyst mass. On the experimental side, we determine that Cs introduction in the amount of 1 % allows reducing the catalyst activity in a side reaction of methanol formation by 2-2,5 times. The Cs introduction into the carbonate mass yields better results than into the calcinated one. Since it results in reducing the formation of byproduct methanol and gives a less negative action on the activity, thermostability, crystallinity, specific total surface and copper surface of the catalyst. [ABSTRACT FROM AUTHOR]

Influence of a constant magnetic field on dielectric properties and conduction composites on a basis epoxy polymer and one of oxide metals (Al2O3, Fe2O3) or mixes the PAn and one oxide the metal, taken in identical quantity is investigated. It is shown, that the composites generated in a constant magnetic field are characterised improvement by dielectric and electrowire properties. For the first time method use extraction is offered to function of losses (tgδ1) epoxide polymer from function of losses (tg&delta12) to a composite for the purpose of studying of properties of transitive layers. [ABSTRACT FROM AUTHOR]

Two series of graft polymers dextran-polyacrylamide (D-PAA) corresponding to the theoretical model of spherical polymer brushes, were synthesized. PAA was grafted to dextran of different molecular weight (Mw=20 000 and Mw=70 000). Samples were identified and characterized by ¹H NMR spectroscopy, self-exclusion chromatography coupled with light-scattering, refractometry detectors and viscometry. The peculiarities of initiation process of radical copolymerization using Ce(IV) were investigated. It was shown that Dextran save the conformation of compact coil during grafting process. It was confirmed that branched polymer are more compact in comparison with their linear analogs. It was determined that intramolecular structure of D-PAA copolymers depends on the distance between PAA grafts as well as their conformation. [ABSTRACT FROM AUTHOR]

Organic-inorganic compositions are developed on the basis of modified L-lisinom of silicate of sodium and oligoeterurethanes with growth by mechanical properties and water resistance. It is set that the increase of the relative lengthening at the break of standards of OIC and diminishing of indexes of water abcorption as compared to the unmodified system depends on the features of forming of structure of inorganic component and OIC on the whole. [ABSTRACT FROM AUTHOR]

Influence of additives peroxyds dicumyl and benzoyl, and chemical - active connections urotropin and a product of interaction resorcinol (1,3-benzenediol) with urotropin (RU-1) on properties of compositions is investigated on the basis of secondary polythene. The method of FTIR -spectroscopy, DSC, by measurement of the contents of gel - fraction, a parameter of fluidity of compositions , carries out researches of their structural features, thermal, physical and mechanical properties, etc. [ABSTRACT FROM AUTHOR]

Solid states of polyelectrolyte complexes based on strong anionic and weak cationic polyelectrolyte -- Na-carboxymethylcellulose and polyethyleneimine lineare-bifurcate structure were characterizad by using of methods of x-ray structure analysis, FTIR, differential scanning calorimetry and dielectric spectroscopy. It was established that amorphous and microgeterogeneite structure of complexes has extremale chenge with successively changing contens of the same component of polymer blands. [ABSTRACT FROM AUTHOR]

Structure and thermal properties of systems based on olygoethyleneglycol and anisometric nanofillers were studied using X-ray scattering and DSC methods. It is shown that structure and thermal properties of the systems based on OEG substantially depend on the nature and content of nanofiller. It is discovered that thermal characteristics has extreme behavior, which is dependent on composition of systems based on OEG. [ABSTRACT FROM AUTHOR]

Is synthesized new hybrid organic-inorganic composites on the basis of modified ε-kaprolaktamom silicate of sodium and urethanes contains isocyanates at the different maintenance ε-kaprolaktama in system. By a method of IR -spectroscopy and thermogravimetric it is shown, that at interaction of the modified silicate of sodium with isocyanates in comparison with pure silicate the exit parity polyurethenuerea and polyurethensilicates changes. Substantial growth of relative lengthening at rupture, and also essential fall of water absorption such OIC caused by features of formation of structure of organo-inorganic composites which is defined by passage of variety of in parallel-competing reactions and copбųuoннһx processes at formation of composites. [ABSTRACT FROM AUTHOR]

Thermal mass-spectrometry has been employed to investigate a processes of thermal destruction of β-cyclodextrin silyl-derivatives. The results of investigations have shown that silyl-derivatives of β-cyclodextrin are more temperaturestable than native β-CD. [ABSTRACT FROM AUTHOR]

The spatial and electron structure of the heptapeptide molecule (Met-Glu-His-Phe-Pro-Gly-Pro) were investigated using semiempirical methods. By theoretical conformational analysis method has been investigated the low-energy conformations, geometric and energetic parameters of this molecule. By quantum-chemical method of CNDO/2 has been determined sharing electronic density and value of dipole moments of Semax molecule in stable conformational states. [ABSTRACT FROM AUTHOR]

The GaN low-dimensional structures obtained by nitridation of GaAs porous layers were investigated for the first time. The process of GaN quantum dots formation on the GaAs surface was considered. This process was a result of electrochemical etching of GaAs followed by treatment in atomic nitrogen environment. Nitrogen atoms, which were deposited on the GaAs surface, replace arsenic ones that lead to the formation of a thin GaN layer on the GaAs surface. The photoluminescence and surface morphology of the structures obtained were studied by scanning electron spectroscopy. [ABSTRACT FROM AUTHOR]

The information characteristics of the oligoglycidylcarbazole compositions with phluorenylcontaining electron acceptors and polymethine dies were investigated. [ABSTRACT FROM AUTHOR]

The refraction properties of dilute water solutions of polyethylene glycol with different molecular mass have been investigated. The Lorenz- Lorenz equation has been used for explanation of experimental results and it was taken into account the payments of the free water molecules and of the hydrated polymer macromolecules to the common polarization. [ABSTRACT FROM AUTHOR]