Measurement of single-crystal piezo modulus by the method of diffraction of synchrotron radiation at angles near π.

This article presents measurements of the piezoelectric modulus of a single crystal of lanthanum gallium silicate (LGS, LaGaSiO). The piezoelectric modulus was measured by X-ray diffraction at angles close to backscattering. Experiments in such schemes are very sensitive to relative changes in the lattice constant in crystals caused by external influences (constant or alternating electric field, mechanical load, temperature change .

Laboratory time-resolved X-ray diffractometry for investigation of reversible structural changes induced in single crystals by external electric field.

Time-resolved technique of X-ray diffraction curve measurement was implemented at a laboratory X-ray source using a high-speed data acquisition system. The time resolution of up to 100 s was achieved via this X-ray diffractometry technique in the experiment of rocking curve dynamics measurement in a piezoelectric lanthanum-gallium silicate crystal under the influence of high voltage periodic pulsed electric field with an amplitude of 3.08 kV/mm corresponding to the pre-breakdown state.

[The bioavailability of zinc oxide nanoparticles. Study using methods of radionuclide indicators].

Zinc oxide nanoparticles labeled with 65Zn were administered once intragastrically to male Wistar rats. The distribution of radionuclide-marker (65Zn) was measured by gamma-spectrometer in tissue samples of animals the organs through 4 hours, 1, 3 and 5 days after administration, and in the wastes of animals through 1 since 5 days. The data obtained demonstrate for the first time the bioavailability of zinc trace element in the form of its oxide nanoparticles.

An assessment of radionuclidic impurities of (210)Po produced via neutron irradiation of (209)Bi for use in targeted alpha-particle radiotherapy.

Radionuclidic impurities of (210)Po prepared by neutron irradiation of (209)Bi via the (209)Bi(n,gamma)(210)Bi reaction were investigated. Following irradiation and ingrowth, a pure (210)Po solution was obtained by sublimation and dissolution. Results were obtained by liquid scintillation (LS) counting, isotope dilution alpha (alpha)-spectrometry, and high-purity germanium gamma-ray spectrometry.

[Conformational analysis of cysteine-containing peptides and prospects of their application to 213Bi chelating in antitumor therapy].

The method of conformational analysis was applied to the spatial structures of peptide analogues of phytochelatins and some fragments of metallothioneins: (Cys-Gly)3, (Cys-Gly)3Asp, (Cys-Gly)3Glu, (Cys-betaAla)3, (Cys-gammaGlu)3, and (Cys-Gly-Gly)3. All the possible low-energy conformations of the molecules were revealed and the role of intra- and inter-residual interactions in the formation of their spatial structures was determined. A different tendency of the molecules under study for acceptance of conformations favorable for binding bismuth ions was shown.