Izvestiya of Saratov University.
ISSN 1816-9775 (Print)
ISSN 2541-8971 (Online)


Биология

Optimization of Cultivation Conditions of Azotobacter Vinelandii D-08 to Increase the Yield of Exopolysaccharide

In current research the optimization of culture conditions Azotobacter vinelandii D-08 on nutrient mediums with different content of molasses – 20, 30, 40 and 50% (by weight) was conducted. It is established that the maximum accumulation of polysaccharides was 13,78 g/l and it was observed at growth of the strain on the medium containing 50% molasses for 72 hours. The results of the method of gel permeation chromatography showed that the obtained polysaccharide has a molecular weight of 0.93532 kDa and 312.5014 kDa.

Macrozoobenthos of Hyperhaline Waterbodies of Bogdino-Baskunchakski Nature Reserve

Macrozoobenthos assay carried out in hyperhaline waterbodies (Gor’kaya river and Lake Baskunchak littoral) of Bogdino-Baskunchakski nature reserve yielded 14 taxa: bugs – 3 (from family Corixidae: Cymatia rogenhoferi (Fieber, 1864), Paracorixa concinna (Fieber, 1848) and Sigara assimilis (Fieber, 1848)), chironomids – 2 (Baeotendipes noctivaga Kieffer, 1911, Orthocladius sp.), other dipterans – 4 (Limoniidae, Dolichopodidae, Ephydridae and Tabanidae (род Chrysops) larvae), beetles – 5 (Dytiscidae: Cybister (s.

New Floristic Finds in the Saratov Region

Provides information about finding new species of flora of the Saratov region Hibiscus triynum and Thesium moesiacum, and clarifies the distribution of rare in the Saratov region Sonchus palustris and Conringia orientalis.

In Vivo and in Vitro Studies of the Effect of Chitosan on the Bone Defect Repair Process

The objective of our in vivo and in vitro studies was to examine the molecular and cellular mechanisms of the anti-inflammatory and wound-healing effects of chitosan barriers when used for guided tissue regeneration (GTR) in a rabbit model. An ELISA test of the rabbit blood serum conducted during the treatment of alveolar bone defects has confirmed the ability of chitosan to reduce inflammation fast by suppressing the TNF- cytokine production.

New Data on the Fauna of Myrmecophilous Beetles (Coleoptera) in the Nests of Ants Formica rufa Linnaeus, 1761 (Hymenoptera) for Territory of Saratov Province

The aim of this article is to investigate the species composition, ecological characteristics and myrmecophily Coleoptera dominant structure in nests of ants of the species Formica rufa Linnaeus, 1761 in the territory of the Saratov region. The studies were conducted mainly in the natural Park of Kumis Polyana (Saratov) and the National Park “Khvalynskiy”. To collect material were determined using standard soil methods of Zoology: screening of the substrate from the nests of ants and laboratory analysis of selected samples.

Fluctuating asymmetry of pholidosis in grass snakes found on four areas of the Republic of Tatarstan is considered in this article. We carried out the statistical analysis of asymmetrical traits and counted the integral characteristics of fluctuating asym

Fluctuating asymmetry of pholidosis in grass snakes found on four areas of the Republic of Tatarstan is considered in this article. We carried out the statistical analysis of asymmetrical traits and counted the integral characteristics of fluctuating asymmetry. Asymmetry of pholidosis was observed in 32% of individuals. Asymmetry in features which are characterized by highest diversity (temporal, postorbital and sublabial scutes) is more common. There are no statistically significant sex, age or population differences in the values of fluctuating asymmetry.

New to the Republic of Bashkortostan Associations of Class Phragmito-Magnocaricetea Klika in Klika et Novak 1941

The system of units of riverside vegetation by Braun-Blanquet method of the class Phragmito-Magnocaricetea of the Bashkortostan Republic includes 4 orders, 7 unions, 29 associations and 1 rankless community today. During studying of riverside vegetation 4 new associations (Scolochloetum festucaceae, Caricetum distichae, Iridetum pseudacori and Leersietum oryzoidis) which weren’t indicated for this region earlier were revealed. The order of Nasturtio-Glycerietalia and the Glycerio-Sparganion union are also for the first time indicated for the republic.

Lipid Peroxidation in Cucumber and Radish Seedlings Affected by Heavy Metals

The effect of heavy metal ions (Ni2+, Zn2+, Cu2+, Pb2+)  in concentrations of 10 ?M, 0.1 ?M and 1 mM on the rate of lipid peroxidation (LPO) has been studied in the 7-day-old seedlings of cucumber (Cucumis sativus L.) and radish (Raphanus sativus L.). It was revealed that Ni2+ and Cu2+ ions induced oxidative stress in plant cells, but Pb2+ and Zn2+ ions did not have toxic effects. The heavy metals effect on LPO increasing was as follows: Zn2+ < Pb2+< Ni2+ < Cu2+ for cucumber plants; Pb2+< Zn2+ < Cu2+ < Ni2+ for radish plants.

Importance of the Saratov Region Red Book for the Preservation of Biological Diversity

The article discusses the importance of the Red Book for the preservation of biological diversity of rare and endangered species in the Saratov region. It is noted that at the present time 578 species of plants, fungi and animals are critically endangered.

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