[Vitamin D status in connection with and genes polymorphism in coal mining workers].

Vitamin D is a unique compound that can enter the human body not only with food, but also be synthesized in the skin under the influence of ultraviolet radiation. Individual differences in the need for this vitamin may be associated with the carriage of polymorphic variants of genes that implement its biological effects, which include VDR BsmI C>T (rs1544410), VDR TaqI A>G (rs731236) and GC rs2282679 T>G. At risk for vitamin D deficiency are workers in the coal mining industry, whose working conditions combine limited insolation and a pronounced deficiency of vitamins in the diet.

Solvability analysis for the Boussinesq model of heat transfer under the nonlinear Robin boundary condition for the temperature.

We consider the new boundary value problem for the generalized Boussinesq model of heat transfer under the inhomogeneous Dirichlet boundary condition for the velocity and under mixed boundary conditions for the temperature. It is assumed that the viscosity, thermal conductivity and buoyancy force in the model equations, as well as the heat exchange boundary coefficient, depend on the temperature. The mathematical apparatus for studying the inhomogeneous boundary value problem under study based on the variational method is being developed.

[Foreign language as an element of professionalism of medical workers].

High-quality medical care and effective public health are impossible without adequate staffing. Modern medicine is subject to the trends of globalization and internationalization, like many other industries and spheres of the national economy, and today both doctors and nurses often provide medical care to foreign-speaking citizens: tourists, migrants, refugees, foreign students, etc. The article provides an overview of publications reflecting the importance of linguistic training and knowledge of foreign languages for medical professionals.

[Symbolism of the white coat in the medical profession].

It has long been a tradition for doctors to dress professionally in white coats - a universal symbol of belonging to the medical profession. This tradition dates back to the time of Hippocrates, but during the XIX-XXI centuries, the symbolism of the white coat was criticized in connection with research on the spread of infections through tissue. Currently, many doctors refuse to use the oldest symbol of the profession, and the practice of medical activity is replete with new variants of the uniform of a medical worker (both in style and in color palette.

Multiple increase in the radiative efficiency of 1060-nm laser diodes based on heterostructures with tunnel-coupled injection and a single waveguide mode.

An approach aimed at increasing the radiative efficiency in heterostructures operating in a single vertical mode at 1060 nm has been studied. Two types of heterostructures-the STJH (single tunnel junction heterostructure) and DTJH (double tunnel junction heterostructure)-have been developed to obtain the operation of a single waveguide mode of the first and second order, respectively. A multiple increase in the injection efficiency is realized by using tunnel junctions (TJs) embedded in the wide-gap barriers and placed between the active regions.