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The article discusses a study on the processes of producing gas-filled polymer electrets and their properties. The higher characteristics of corona electrets based on expanded polystyrene than polystyrene electrets are established. The study found that values of the electret potential difference of the plastic foams are suited for their practical application.

From genetic point of view, differences between ancient and modern horses can be reconstructed by using the phylogeographic analysis of mitochondrial genomes and by studying phenotypically important nuclear loci. The variety of modern horse coat colors resulted from artificial selection indicates a high degree of domestication. We have conducted the phylogenetic analysis of mitochondrial DNA extracted from bone samples of six ancient horses from Tsaramburial in the Republic of Buryatia, and established that they belong to a haplogroup E by Achilli’s classification. This haplogroup is found among modern horses of the Maremmano breed from Italy. Gray coat color different from wild type have been detected in two ancient horses, which demonstrates a sufficiently high domestication level of Buryat horses during the period I century BC to I century AD. The analysis of the mitochondrial genome hypervariable region fragments revealed that ancient Buryat horses belong to a haplotype X3 by Cieslak’s classification, which is ancestral to the haplogroup X3 of modern horses in Mongolia, Tuva, and Buryatia.

In the conditions of high relative density of multidrug resistant tuberculosis in Ukraine, rapid diagnostics of M. tuberculosis susceptibility to antituberculous drugs is the important tool in treatment of patients with lung tuberculosis. 78 patients with lung TB that were treated in TB dispensary in Kharkiv during 2004-2005 years were analyzed. Mutations in 531 codon of rpoB gene of isolates M. tuberculosis were studied. Among 48 (61.5%) resistant isolates of M tuberculosis according to phenotypic method, mutations were found only at 29 (60.4%) isolates. Among 30 (38.5%) phenotypic sensitive M. tuberculosis isolates only 1 (3.3%) isolate had mutation in rpoB gene M. tuberculosis.

Multiple sclerosis is a classic multifactorial disease in which etiology interaction of external factors and structural features of a large number of genes plays an important role. Identifying risk factors for multiple sclerosis and creating an integrated model of pathogenesis are urgent tasks of neurology. Revealing true risk factors is possible only in studies with sufficient statistical power, so with a large amount of samples. We conducted the association study of CD40 gene's polymorphisms and multiple sclerosis among residents of the Russian Federation. The results demonstrated the need to combine data from different researchers in clinical studies to increase the power of the study.