The presented work shows the study of energy transitions in the NIR and visible regions in the system of Bi₂O₃ and Tm₂O₃ powders. Mechanisms of upconversion luminescence and NIR luminescence between two Bi³⁺ and Tm³⁺ ions at T = 80 K accompanied with nonradiative energy transfer through the vibrational levels were investigated under IR photoexcitation. The absorption bands of the samples on the reflection spectra were examined in the visible region. The values of the emission cross-section parameters were calculated for the Bi₂O₃/Tm₂O₃ complexes.

This article presents the results of studies on the effects of Viburnum opulus extract on Escherichia Coli (E.Coli). It has been shown that the aqueous extract, when exposed to laser irradiation, produces cell growth and activation of cellular metabolism. It has been established that under the action of laser irradiation the process is pronounced. When exposed to an aqueous-alcoholic extract, it was found that when exposed to laser irradiation, the intensity of phenylalanine vibrations decreases, which indicates the processes of apoptosis in the cell. It was shown that 1003 cm-1 phenylalanine band was the main characteristic band, according to cell metabolism.