Comparison of methods for the synthesis of silver nanoparticles stabilized in a solid polymethacrylate matrix.

Silver nanoparticles were synthesized inside the small plates of transparent polymer medium by reduction of silver cations. The difference in morphology and sizes of nanoparticles synthesized by chemical, photochemical and thermal reduction was revealed, which depends both on the component ratio of the mixture and on the reduction time for the specific component ratio The polymethacrylate matrix itself acts as the stabilizing agent. A colorimetric sensor based on polymethacrylate matrix and silver nanoparticles was developed for the detection of hydrogen peroxide.

A novel impedimetric sensor based on N-acetyl-L-cysteine for the determination of hydroxyl radicals in cell cultures in vitro.

We report a novel impedimetric sensor based on a graphite electrode impregnated with polyethylene and paraffin under vacuum (IGE) modified with electrochemically deposited gold and a self-assembled monolayer of N-acetyl-L-cysteine (NAC/Au/IGE) for selective and sensitive determination of extracellular hydroxyl radicals (OH) generated by living cells. The application of a sulphur-containing molecule oxidized by OH predicts the high selectivity of the sensor, and the utilization of the non-faradaic impedance spectroscopy for recording an analytical response makes it possible to achieve superior sensitivity with a detection limit of 0.01 nM and a linear dynamic range of 0.

Adsorptive stripping voltammetric determination of carbofuran in food using novel type of modified carbon-based electrode with grafted layers of nickel.

A voltammetric determination of carbofuran (CBF) was developed using a novel type of carbon-containing electrode (CCE) modified with carbon ink (CI) and a chromatographic sorbent (CS) based of chromaton (Ch), polyethylene glycol and nickel acetylacetonate with grafted layers of nickel (NiCS, stands for Ni modified CS) further denoted as CI/NiCS/CCE. The surface morphology of this modified electrode was investigated by scanning electron microscopy (SEM) and by electrochemical impedance spectroscopy (EIS). CBF which is not electrochemically oxidizable was first hydrolyzed in alkaline medium to give anodically active phenolic analogue CBFP.

Endothelial Cell Behavior and Nitric Oxide Production on a-C:H:SiO-Coated Ti-6Al-4V Substrate.

This paper focuses on the surface modification of the Ti-6Al-4V alloy substrate via a-C:H:SiO coating deposition. Research results concern the a-C:H:SiO coating structure, investigated using transmission electron microscopy and in vitro endothelization to study the coating. Based on the analysis of the atomic radial distribution function, a model is proposed for the atomic short-range order structure of the a-C:H:SiO coating, and chemical bonds (C-O, C-C, Si-C, Si-O, and Si-Si) are identified.

Dynamical and thermodynamical approaches to open quantum systems.

The non-Markovian dynamics of open quantum systems is studied from two different points of view. The first one coincides with the traditional tracing out of the environmental degrees of freedom, presented in classical textbooks on open quantum systems. The second one is an approximation of the exact density operator with the knowledge of only several dynamical variables in the spirit of non-equilibrium thermodynamics.

[Consumption of carbohydratecontaining beverages and their contribution to the total calorie content of the diet].

The article presents data on the frequency of consumption of carbohydrate-containing sweet carbonated drinks by the population of the Russian Federation and their contribution to the overall caloric intake of the diet. Questioning 11 850 people of different ages (from 12 to 60 years) and sex in all eight Federal Districts of Russia has been conducted. The frequency of food consumption has been studied, and in parallel dietary intake has been assessed using 24-hour recall method.

Stochastic wave-function unravelling of the generalized Lindblad equation.

We investigate generalized non-Markovian stochastic Schrödinger equations (SSEs), driven by a multidimensional counting process and multidimensional Brownian motion introduced by A. Barchielli and C. Pellegrini [J.

[Frequency of consumption of sweet carbonated drinks by the population of different age groups of the Russian Federation].

The article analyzes the frequency of consumption of sweet carbonated beverages by various age groups (from 12 to 60 years) of the population of all Federal districts of Russian Federation. The presence of general regularities in the frequency of consumption of these drinks, regardless of the region, was established. About 5-8% of the population of different age and sex groups consumed sweet carbonated drinks with a fairly high frequency (5-6 times a week).

[The use of contact thermography for evaluating joint inflammation in rheumatoid arthritis].

The paper is concerned with the results of a study of the hand joints in patients with different variants of a course and activity of rheumatoid arthritis by a method of contact liquid crystal thermography. Methods for assessment of thermography taking account of qualitative and quantitative indices were described. They showed correlation with a degree of disease activity, the presence of the rheumatoid factor, extraarticular symptoms and a time-period.