Биология

List of herbarium papers of black-fruited sedge Carex melanostachya Bieb. ex Willd. stored in Herbarium of Saratov State University had been made in number of 132 specimens from Russia (Astrachan, Volgograd, Orenburg, Saratov regions and Kalmuck), also Kazakhstan with the framework of preparation for project 'Flora of Rossia'.

Description of seven main associations of oak forests in Chvalynsk national park of Saratov region had been made depending on soil and position on the relief. The state of viability had been estimated. Species composition of herbaceous and shrubs strata had been discovered.

We studied the nitric oxide availability in blood in healthy and hypertensive female rats under deficient of estrogens under rest and stress conditions. We found that the basal and stress NO levels were lower in hypertensive vs. healthy female rats.

In article are considered changes of some physical and chemical parameters of blood white female rats on at toxic influence by ions of cadmium and during the various periods of adaptation.

Problems of bird propagation dynamics in the northern Lower-Volga region under the influence of natural environmental factors and in the course of evolutionally-caused historical processes are discussed. Main trends in climate variations within the last millennia are considered.

The article is addressed to changes in the activity of essential enzymes of nitrogen metabolism in the offspring exposed to toxic influence in the neonatal period. Possible mechanisms of these changes are discussed.

The ability of strain Dietzia maris AM3, isolated from oil-silme, for active utilization of petroleum hydrocarbons was shown. Plasmids (size, near 54 kb) were found in this strain, capable of degrading petroleum hydrocarbons by 50–70% both in acid and in neutral media.