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


The Specifics of Tobacco Gametophyte Mutations Display Depending on Temperature

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.

Photodynamic Effect of Red Laser Radiation on the Growth of Staphylococcus aureus Strains with the Use of Photoditazine

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%.

Pollen Grain Size Polymorphism in Late Tulip (Tulipa gesneriana L., 1753) Cenopopulations within the Territory of “Ivanovo Field” Natural Boundary

One of the large populations of the late tulip (Tulipa gesneriana L., 1753) grows in Fedorovsky district of the Saratov region on the territory of the regional “Ivanovo field” natural boundary where it is presented by three cenopopulations. The work is aimed at studying of mature pollen morphology of the given cenopopulation plants characterised by various variants of flower parts coloration. We analysed the dimension and other morphological features of the pollen fixed in 2012 when rich diversity of floral envelope coloration was registrated in the research area.

The Influence of Roof Space Arrangement on Rock Pigeon` Penetration Level (Columba livia Gmelin, 1789)

The statistics of correlation of rock pigeon occurrence depending on its construction in the roof rooms were presented (Columba Livia Gmelin, 1789). The relevance of the study conditioned by the need of some anthropogenic objects protection (monuments, granaries, airports) against birds particularly from rock pigeon which forms numerous flocks near the points of residence. The problem of bird hazard is particularly topical for airports where the pigeon is one of the most dangerous for the aircraft.

Flow Cytometry Investigations Indicators Light Scattering in the Heterogeneous Population Immune System Cells from Mice Immunized with F1 Capsular Antigen, Yersinia pestis

Aim – heterogeneous populations of blood leukocytes and abdomi- nal cavity of mice immunized with a capsular antigen of a plague microbe. Male mice of the BALB / c line were used in the work. The reaction of the cells of the immunophagocytic system was assessed by flow cytometry, in terms of the intensity of direct and lateral light scattering, correlating with changes in the cell volume and intracellular granularity.

Conserved and Variable Regions of the Methanol Dehydrogenase Gene Among Halotolerant Representatives of Methylophaga Genus

We investigated conserved and variable regions of the mxaF gene and amino acid sequence in methylotrophic strain M1K isolated from saline soil rhizosphere and belonging to Methylophaga genus. The significant heterogeneity was revealed in methano- and methylotrophic bacteria by method of Minimum Evolution. The ability of strain to influence indole-3-acetic acid synthesis from L-tryptophan and halotolerance are the arguments in favor of application in new agrotechnology.

Mosquitos (Diptera; Culicidae) of the Saratov Region

Described is the fauna of bloodsucking mosquitoes found in the Saratov Region. The article is based on the data collected dur- ing the field surveys in the flooded biotopes along the Volga and Don river basins and Kamysh-Samara enclosed lake basin, as well as on the literature data available. By 1970s, 31 species of mosquitoes have been spotted in the Region. The paper presents qualitative and quantitative changes over the 45-year period in the populations of bloodsucking mosquito, habitant in the flooded areas of different rivers.

A Study of Iron-oxidizing Microorganisms for Possible Use in Biotechnology of Water Purification

The ability of a variety of bacteria isolated from soil samples with high levels of magnetism of the city Mednogorsk to oxidize iron (II) in conditions of periodic cultivation in a liquid medium was studied. Investigating the increase in total biomass using its wet weight and analyzing its absolute bacterial biomass growth after 7 and 14 days of cultivation resulted in the identification of two microbial isolates with maximum growth rates. The wet biomass weight of these isolates (69.3 and 69.5) was 15.3 and 14.7 g/l after 14 days of cultivation.

Effect of N,O,S-contaning Heterocyclic Compounds on Growth of Root System of Triticum aestivum L.

Conducted biological testing of synthetic heterocyclic compounds: 2-benzoylmethyl-3-benzoyl-2-phenylaziridine, 2-benzoyl-3, 5-diphenyl-4-chlorofuran and 2-amino-4(1,3-diphenyl-2-chloropropene-1-one-3-yl)-5-phenyl-1,3-thiazole. The investigated compounds are members of three series of heterocyclic compounds and obtained at the Department of Organic and Bioorganic Chemistry National Research Saratov State University.