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Sweet diterpene glycosides are known to accumulate in Stevia rebaudiana Bertoni (Stevia genus of Compositae family). Although the Stevia genus contains 154 species, only two of these are capable of accumulating sweet diterpene glycosides, and their maximum content in the above-ground part of Stevia rebaudiana Bertoni falls within 10 – 20% (per dry weight)(More)
The quality parameters of naltrexone microspheres based on the copolymer of lactic and glycolic acids (PLGA) were established as a function of the microencapsulation process parameters. The release profile of the developed naltrexone dosage form was found to coincide with that of the reference drug Vivitrol. The results were interesting scientifically and(More)
This paper studies the structure and dynamics of the major pools of organic matter in clearings in the lichen pine forests of the middle taiga subzone of Yenisei Siberia, in the range of measurements of the international observatory Zotto, a high-tech research platform for long-term (>30 years) monitoring of the atmosphere and climate changes. The(More)
A new approach to the formulation of eye drops containing the active substance taurine and adjuvant polymers such as dextran, poly(hexamethyleneguanidine) hydrochloride, and Sovidon is proposed. According to this, the eye drop formulation must begin with a study of the physicochemical properties of the polymer and taurine solutions, in particular an(More)
Blood substitutes performing one or several physiological functions of the blood are widely used in clinics. Otherwise, acute hemorrhage leads to a sharp drop in the blood pressure and the blood flow rate, which results in a syndrome of disseminated intravascular coagulation, arrest of blood circulation, and dehydration of the organism. In order to prevent(More)
We consider an ensemble of identical semiconductor nanoparticles randomly embedded into dielectric matrix. The nanoparticles are polarized by the laser irradiation having linear polarization. The contribution of dipole-dipole interactions to third-order dielectric susceptibility is calculated by using mean random field method. It is shown that this(More)
Aqueous dextran solutions, polyhexamethyleneguanidine hydrochloride and Sovidone and their mixtures with taurine were used to form stable ultrathin protective films for ophthalmological use. Addition of taurine to dextran and polyhexamethyleneguanidine solutions induced an association between polymer macromolecules in the two-dimensional film and a decrease(More)
Aseries of N-oxides of N-vinylpyrrolidone and 2-methyl-5-vinylpyridine copolymers with various degrees of oxidation were prepared via oxidation of the copolymers by peracetic acid. The N-oxidation kinetic rate constants were calculated using UV spectrophotometry. The temperature dependence of the limiting N-oxidation was determined. The molecular-weight(More)
N-Vinylpyrrolidone and 2-methyl-5-vinylpyridine copolymers with various ratios of monomer units and molecular weights were synthesized by radical copolymerization using an injection method. The ratio of monomer units was determined by non-aqueous potentiometric titration and 13C NMR methods. The viscosity-average molecular weights of copolymers containing(More)