Lead overlayer dynamics on Ni(111).

Ultrathin lead films on metallic and semiconductor substrates are technologically demanded and actively studied by different experimental and theoretical methods. The formation of these films gives rise to new adsorbate-induced electron states and vibrational modes. The dynamical properties of atoms on surfaces depend sensitively on their bonding environment and thus provide valuable insight into the local geometry and chemical bonding at the boundary of a solid.

X-ray fluorescent method for the analysis of trace elements in bio-materials with correction of the matrix effect.

A method for correcting the matrix effect by measuring the intensity of fluorescent radiation and its absorption by the sample material in the same x-ray optical scheme is proposed. The use of a complex secondary Ag-Ge emitter as a primary radiation source provides a low detection limit for a wide range of chemical elements from Ca (Z = 20) to Mo (Z = 42) in the K-series and from Cd (Z = 48) to Bi (Z = 83) in the L-series. To measure the absorption, the radiation of an additional secondary emitter is used, of which the wavelength can be varied in the range from 0.

Use of cells in quercetin detection.

The possibility of detection and determination of flavonoids by using microbial cells was shown for the first time using the quercetin - Sp245 model system. The activity of the flavonoids quercetin, rutin and naringenin toward Sp245 was evaluated. It was found that when the quercetin concentration ranged from 50 to 100 μM, the number of bacterial cells decreased.

Surface dynamics on submonolayer Pb/Cu(001) surfaces.

The interplay of the atomic structure and phonon spectra in a variety of two dimensional phases forming during submonolayer Pb adsorption on a Cu(001) surface has been investigated using embedded atom method interatomic interaction potentials. Complementary calculations of the equilibrium atomic structure of these phases were performed using density functional theory. It has been shown that the dynamic stability of the Pb/Cu(001) structures increases with increasing the coverage from 0.

Mertensia (Boraginaceae) seeds are new sources of γ-linolenic acid and minor functional compounds.

In this work, seeds from selected Mertensia species were analyzed for γ-linolenic acid-rich oils and minor functional compounds. Fatty acids (FA) were analyzed by GC-FID; tocopherols, sterols, squalene, and phenolics compounds by HPLC-DAD, and the structures of the latter were confirmed by LC-MS. M.