Nuclear magnetic resonance (NMR) relaxation technique was applied to study the interaction of cholesterol with natural complexant - glycyrrhizic acid. Stoichiometry, stability constants and thermodynamic parameters of the complex have been measured. We propose that the complexation with glycyrrhizic acid could be an effective approach to regulate the cholesterol level inside and outside of cage membranes.

Orientation distribution functions of nitroxide spin probe in nematic liquid crystal 5CB embedded into porous polyethylene film were determined at 295 K and at 77 K by numerical simulation of electron paramagnetic resonance (EPR) spectra. The procedure of simulation of EPR spectra at 77 K in the absence of molecular mobility of spin probe molecules allows determination of non-equilibrium orientational distribution function in supercooled liquid crystals. The suggested procedure yields an orientation distribution function of orientational axis of a spin probe molecule. Orientation distribution functions for the sample at 295 K and 77 K were found to be similar.

Temperature dependence of the conduction electron Lande g-factor in silicon has been investigated both theoretically and experimentally. Theoretical consideration is based on the renormalization of the electron energy in the magnetic field by the electron-phonon interaction in the second-order perturbation theory. Interaction with lattice vibrations decreases the conduction electron g-factor. The g-factor was measured in the electron spin resonance experiments for n-Si samples. In the high temperature limit the g-factor linearly decreases with temperature in good agreement with the experimental data.

In this work the cyclic peptide cyclosporine was investigated. Signal assignment was made according to 2D NMR spectra. Using NOESY spectra and computer simulation the spatial structure was also obtained.

Expressions for the calculation of matrix elements of the Coulomb interaction of the electron with an infinite crystal lattice in ion crystals have been obtained. In the general case, matrix elements are calculated on the orbitals belonging to ions of different sites. Gaussian type orbitals are used in the calculations. All expressions are absolutely and rather rapidly converging series in the space of the inverse lattice vectors. At present the value of this interaction being only one center is estimated by the Madelung constant, in other words, by calculating the electrostatic potential in the lattice site, i.e., in a point.