Биология

Microbial ecological systems of Aphis pomi Deg. digestive tract in territory of the Saratov region was studied. 23 bacteria species belonging to 15 genera was revealed. Curtobacterium flacumfaciens causing diseases at plants was among them.

Azospirillum can directly or indirectly stimulate growth of plants and improve yield of at least several plant species. Structural distinctions LPS O-antigen determinate antigen variations Azospirillum species. Thirty eight strains of Azospirillum were screening. The fact that most research strains demonstrated cross-reactions with model strains underlie the division into three serotypes, including eight serovariants. Seven strains demonstrated cross-reactions only with genus-specific antibodies and have been separated into individual group.

The effects of toxin producing entheropathogenic Escherichia coli on blood microcirculation in ventral mesentery of white rats were studied. The increasing of blood flow velocity in capillaries has been observed under the influence of toxins in the course of short intervals.

The renovations to the ecological formulas of 36 species were made on the basis of 117 phytocoenotic descriptions in Saratov region. The entering of 8 new species in ecological scales of L.G. Ramenskiy et al (1956) are proposed/ In this paper the enumeration of additional species and their ecological formulas are adduced.

In a course of investigation of seed productivity under the pollenless regime of flowering in 154 natural populations of 98 species of 46 the Asteraceae genera from Saratov province gametophytic apomixis has been discovered in populations of 24 species from 14 genera. For the first time this mode of reproduction has bean revealed in 7 genera and 16 species of the family (Hieracium largum, Pilosella echioides, Tragopogon dubius, Lactuca serriola, Scorzonera ensifolia, Chondrilla latifolia. Ch.

The habitation of three species of the Cobitidae family (Misgurnus fossilis, Cobitis taenia, and Cobitis melanoleuca) in the reservoirs of the Northern Lower-Volga region is confirmed. That of two species of the family (Cobitis rossomeridionalis and Sabanejewia aurata) in the region is hypothesized.

The existing hypotheses of integrity of a plant are considered. It is offered new to the concept of integrity on the basis of existence of many independent blocks and special role sklerenchyma in life of a plant.

It is made study of sex influence to the most important enzymes of animal metabolism and parameters of protein, carbohydrate and lipid parts of metabolism for different species of laboratory animals. Shown true sex differences for many biochemical parameters of blood for white rats, for rabbits are founded differences for some enzyme activities and also some indexes.

Spectral properties of coleoptiles and epicotyles of wheat was investigated by cytophotometry. In this organs where found several different photosystems, that have no common absorption spectral areas. Coleoptil in dark growth have the largest lightpiping. Growth in light environment make coleoptil as optical filter.

List of herbarium papers of early sedge Carex praecox Schreb., stored in Herbarium of Saratov State University had been made in number of 82 specimens from Russia (Volgograd, Saratov, Ulyanovsk regions, Bashkiria and Kalmykia). Information of labels had been indicated.