Estimation of the number of polar molecules in a solvate shell of a fluorescent probe 4-dimethylaminochalcone

The fluorescence decay kinetics has been studied in different parts of the emission spectrum of diluted solutions of a membrane fluorescent probe, 4-dimethylaminochalcone, in a binary n-heptane + acetone solvent with the volume fractions of polar and nonpolar components of the latter varying in a wide range. It has been shown that the fluorescence of these solutions has a significantly heterogeneous character, which is indicative of the presence of several types of solvate complexes with controllable ratios of components (1: 1, 1: 2, 1: 3, etc.) in the studied systems. Based on a quantitative analysis of the mentioned kinetic dependences, a model has been proposed in which these data can serve as a source of information about statistical features of the structure of solvate shells of polar dye molecules in an excited electronic state. This information can in turn be used to obtain new biophysical data.     

Influence of natural convection on the crystallization of pseudobinary compounds

The solution of the problem concerning the influence of intrinsic convection on the crystallization rate of pseudobinary compounds in an ampul by the method of vertical-directed crystallization is considered. A mathematical model of the physical processes occurring in the apparatus for the growth of semiconducting structures is outlined. An algorithm for numerical realization of the proposed model is constructed. The significant influence of natural convection in the melt/solution on the rate of crystal growth is shown.Translated from Teoreticheskaya i Prikladnaya Mekhanika, No. 19, pp. 94–98, 1988.     

Synthesis of a donor-acceptor photosynthetic system containing covalently bound amine,porphyrin, and quinone

The synthesis of a diquinone derivative of the amino-containing analog of hematoporphyrin IX, obtained by the sequential modification of the tetramethyl hematoporphyrin IX, was accomplished.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 196–199, February, 1991.     

Refined equations of elliptic boundary layer in shells of revolution under normal shock surface loading

This paper continues the studies on the construction of the first order approximation of equations for a boundary layer in the vicinity of a surface Rayleigh wave front in shells of revolution under normal shock surface loading. Since the first order asymptotic approximation is insufficient for determination of all components of the stress-deformed state, we obtain refined asymptotic equations for construction of solutions for all components of displacements and stresses with an asymptotic error of the order of the relative shell thickness.