Vol 46, No 8 (2019)

A low-frequency stimulated scattering (LFSS) signal caused by pulsations of nanospheres under an electromagnetic field is detected in an aqueous suspension of dielectric nanospheres of three diameters (∼74 nm, ∼292 nm, and ∼540 nm) at various particle concentrations. The frequency shifts of the scattering line, calculated based on the developed model, are in good agreement with the measurement results.

This work was performed within the OLYMPIA experiment on the study of tracks of heavy and superheavy cosmic ray nuclei in olivine crystals from Marjalahti and Eagle Station pallasites. Depth distributions of the track formation rate for heavy cosmic ray nuclei in olivine crystals from pallasites of different pre-atmospheric sizes were obtained. The dependences obtained were used to analyze the data on the track density in olivine crystals from the Marjalahti pallasite. In three crystals, the track distribution with a high density gradient was detected, which indicates a complicated radiation history of the meteorite.

Scintillation single crystals and polycrystals of gadolinium oxyorthosilicate Gd₂SiO₅: Ce³⁺,Ca²⁺ are grown by the Czochralski method. The effect of the doping ion concentration on pulsed cathodoluminescence spectra, light output, and scintillation time under gamma excitation is studied. It is shown that the scintillation time decreases with increasing both Ce³⁺ and Ca²⁺ ion concentrations.

An atomic force microscope (AFM) is a molecular detector that allows the recording of individual proteins and protein complexes on the surface of an atomically flat substrate, the AFM chip. Registration of target proteins is carried out after the fishing procedure — catching out of proteins from the volume of the analyzed solution to a surface of a small area (sensory zone of the chip) modified by affinity reagents against the target protein. The use of the procedure of biospecific enrichment makes it possible to effectively concentrate the molecules of the target proteins in an amount sufficient for the subsequent mass spectrometric analysis for early diagnosis of ovarian cancer in blood samples.