NEW SERIES. SERIES: PHYSICS
ISSN 1817-3020 (Print)
ISSN 2542-193X (Online)


Краткие сообщения

Effect of the temperature of NaYF4:Er,Yb upconversion particles on the formation of luminescence

The intensity of upconversion luminescence depends nonlinearly on the pump power intensity. The study of the dependence under various conditions is important, since it allows us to analyze the changes in the mechanisms of formation of the upconversion luminescence. The aim of this work is to study the effect of the temperature of NaYF4:Er,Yb upconversion particles on the dependence of the luminescence intensity on the intensity of the exciting radiation.

NON-INVASIVE METHODS FOR IN VIVO DETERMINATION OF THE SKIN BARRIER FUNCTION – ADVANTAGES OF CONFOCAL RAMAN MICROSPECTROSCOPY

The physical barrier of the stratum corneum (SC) is provided by corneocytes and the lateral organization of intercellular lipids, which necessarily includes the orthorhombic organization phase. A review of methods used for in vivo non-invasive measurement of skin barrier function has been carried out and it has been shown that all currently used methods are indirect. The most popular method is the measurement of the transepidermal water loss (TEWL), which does not provide information on biophysical parameters responsible for the barrier function of the SC.

Оценка величины обратного кровотока по второй производной пульсовой волны давления

Приведены результаты моделирования формы пульсовой волны давления в двухэлементной модели виндкесселя. Диастолический участок пульсовой волны чаще всего анализировался ранее как результат отражения прямой волны от элементов периферических сосудов. Однако измерения отрицательной линейной скорости кровотока по ультразвуковым допплерограммам однозначно свидетельствуют о наличии обратного кровотока в артериях.

Trapping of Magnetic Nanoparticles in the Blood Stream under the Influence of a Magnetic Field

Magnetic nanoparticles, as controlled drug carriers, provide tremendous opportunities in treating a variety of tumors and brain diseases. In this theoretical study, we used magnetic nanoparticles, such as Superparamagnetic Iron Oxide Nanoparticles (Fe3O4) (SPION). Due to their biocompatibility and stability, these particles represent a unique nanoplatform with a great potential for the development of drug delivery systems. This allows them to be used in medicine for targeted drug delivery, in magnetic resonance imaging and magnetic hyperthermia.

Nanostructured Porous Silicon Layers Formation at Low Doses of γ-Radiation

We present results of experimental study of nanoporous Si (SiNР) structure formation by using the method of metal-stimulated chemical etching upon irradiation with small doses of γ-radiation directly in the process of production (in situ). It is shown that the radiation leads to an increase of the crystallization of SiNP structures obtained on previously irradiated substrates. Apparently, this can be explained by a decrease in the initial defectiveness of the silicon substrate due to irradiation with small doses of γ-radiation.