Биология

Gold nanoparticles are intensively studied in biomedicine. Evaluation of their biocompatibility is highly important. In aquatic systems, microalgae, being the primary producers, are the base of the trophic webs. They are the first target for most of the pollutants present in the medium. To study the toxicity of ionic and colloidal gold on the saltwater microalga Dunaliella salina. To describe several physicochemical characteristics of nanomaterials that affect their toxicological efficiency.

In the Saratov region all species of Iris are listed in the regional Red Book, with this connection, to preserve these plants, it is necessary to introduce them in an extensive researches, protection and establishing them in the literature. special interest is the study of seeds due to the direct relation with the potential possibility of generative propagation of Iris species, the article presents the results of an anatomical study of the seeds of seven species which belong to Iris L. in Saratov region flora.

Azospirillum bacteria are engaged in associative interactions with a wide range of plants. In this type of interaction, there formed no specialized structures like nodules, which are characteristic of the legume-Rhizobium symbiosis. The formation of biofilms by Azospirillum on the plant root surface can be important for the successful functioning of plant-microbe associations. Scarce data exist on the role of cell surface protein structures in the formation and stabilization of Azospirillum biofilms. It is known that as compared to A.

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.