Биология

Synthetic dyes are the largest class of chemicals that have found their commercial use in various industries. The most used are azo and anthraquinone dyes. However, most of them are not only toxic, carcinogenic, and mutagenic, but also resistant to biological destruction. The aim of the work was the screening of azospirillum strains according to their ability to biodegrade azo dyes and anthraquinone dyes. 

The paper presents the results of a study of the morphology of the cone of growth and primordium of leaves of the main bud of the embryo grain of winter rye of some varieties from different breeding centers in Russia. The length of the cone of growth reached in the investigated varieties of rye from 51 to 89 ?m. Some varieties of rye in the cone of growth of the embryonic shoot of the embryo grains indicated the embedding of the 4th phytomere in the form of a leaf rudiment.

Soil-inhabiting ligninolytic basidiomycetes, such as Stropharia rugosoannulata, play an important role in the transformation of soil organic matter, including the degradation of pollutants. Information on the mechanisms of degradation of xenobiotics by these fungi and their ligninolytic enzymes is still limited. The degradative activity of the soil-inhabiting basidiomycete S. rugosoannulata towards four-rings PAHs was revealed. Fluorene and 2-carboxybenzaldehyde have been identified as products of degradation of fluoranthene and pyrene. The laccase of S.

Lipopolysaccharides (LPS) of plant-growth-promoting bacteria of the genus Azospirillum are involved in the initial steps of formation of the association with host plant. This work aimed compositional analysis of the LPS from Azospirillum zeae and Azospirillum formosense. The LPS were extracted from the cells by hot phenolwater solution. Biopolymer composition of the LPS was studied by colorimetric methods. Determination of the fatty acid composition of the lipid A was performed by GLC. O-deacylation of the LPS A.

This work is devoted to research of features of the vegetative support of activity of young persons, their cerebral hemodynamics depending on the localization of the transition zone in the chest leads ECG in the process of performing active orthostatic test. Registration of ECG, parameters of cardiorhythmography, reoentsefalografii was carried out using the diagnostic complex «Valenta».

The article is focused on studying of cytoembryological preconditions of polyembryony in the not pollinated ovary of the apomictic maize line АТ-1 under in vitro and in vivo conditions. For an assessment of a nutrient medium role in polyembryony induction a relative analysis of the embryo sacs in cultivated in vitro and native plants ovaries has been lead. Dynamics of formation in them an apomictic twin proem- bryo is traced.

Gamaside mites have ancient, strong links to a number of pathogens of natural-focal diseases. They constitute a considerable part of ectoparasites living on small mammals. Ac- cording to literature data and own research results, the fauna of Gamaside mites in the Saratov Region includes 44 species. Objec- tive of the study was to investigate the current state of Gamaside mite fauna ecologically associated with rodents in the territory of the Krasnoarmeisk District of the Saratov Region. The research was conducted in September-October, 2010 and in August, 2012.

The research of extreme low (10°С) and high (37°С) temperatures influence under in vitro conditions on phenotypic display of three mutations in Nicotiana tabacum L. with of a certain morphological type domination was conducted. The BG-141.4 line is character- ized by low-cellular embryo sacs formation, in the SG-27/4 line the trait of the increased number of nucleus and cells in embryo sacs exhibits, the line М-3 differs by high frequency of cenocyte low- cellular embryo sacs.

The influence of red laser irradiation on the growth of colonies of Staphylococcus aureus and photodynamic effect of the photosensi- tizer Photoditazin were performed. It is established that the radiation of a semiconductor red laser (? = 660 nm, 100 mW/cm2.) has a direct bacteriostatic effect on the growth of S. aureus. This effect on the standard strain is manifested only when relatively high doses are used (180 J/cm2). Inhibition of bacterial growth reaches 36%.