Биология

Lignin peroxidase is one of the main enzymes of fungi decomposers of wood, that is capable to many non-specific oxidation of aromatic and polycyclic compounds. By the beginning of our research there were virtually no data of the bacteria’s ability to produce the lignin peroxidase. Rather recently lignin peroxidase activity was detected by us in the washouts from the surface of the bacterial cells and in intracellular extracts of bacteria from genus Azospirillum.

The initial stage of interaction of infectious agents with micro-organisms cells is the process of adhesion. So there is a need to develop methods that reduce the adhesive activity of microorganisms. Aim: to study the impact of water and water dialyzed dispersion of silver and copper nanoparticles obtained by biochemical synthesis, on the adhesive properties of the standard and clinical strains of S. aureus. Using standard techniques for cells of S.

The research presents the results of morphological study of seeds belong to five species of Iris L.: I. aphylla L., I. halophila Pall., I. pseudacorus L. I. pumila L., I. sibirica L. which existed in Saratov region and cultivated in the botanical gardens of national research of Saratov state university, previously named «N. G. Chernyshevsky».

In work results of research morphogenesis wheat are presented at presence or absence of the light factor. Influence of light on growth of all leaf shoot, activity of a cone of increase and growth of germinal root system of a seedling of wheat is established. In the presence of the light factor growth epicotyl begins with the moment of the termination of growth coleoptile. Growth epicotyl occurs synchronously to growth of a sheath of 1st leaf. In the absence of light growth coleoptile and epicotyl proceeds and after end of growth of a plate and a sheath of 1st leaf.

Microbial associations on surfaces and internal environment on shoots of apple sorts Golden Delicious, Wealthy and Berkutovka with symptoms of fungal infections were studied. 195 strains of epiphytic and endophytic bacteria, of which 8 strains had marked antagonistic activity against phytopathogenic fungi Alternaria alternaria, Aspergillus tubiengensis, Fusarium incarnatum equiseti, Fusarium tricinctum and Phoma fungicola were isolated. Antagonistic bacterial strains are identified as Bacillus amyloliquefaciens SA77, B. badius SA68, B. gibsonii SA104, B.

The embryo sacs structure in the two mutant lines of Nicotiana tabacum L. was investigated. The various disturbances in the megagametopyte structure were detected. In the М-3 line the gametophyte mutation suppresses the nucleus mitotic activity and cell walls initiation in embryo sacs. These disturbances lead to the formation of low-nuclear coenocytic or cellular gametophytes. In М-2 line the cellular gametophytes with increased number of cells and nucleus was dominated. The reason of this phenomenon is an increase of mitosis number during a gametophytogenesis.

In the article was given the mathematical approaches to classification and clustering of data of acoustic signals in communication between myrmecophilic beetles (Scydmaenus hellwigii) and ants (Formica rufa). For the first time for these species were used a cluster analysis which revealed four clusters, each of them has its own command from the beetle to the ant. Each command was defined by specific ranges of dominant frequencies and a range of medium amplitudes (the values of the parameters R).

The aim of the item is to collect and analyse the literature material of many researchers on trophic activity of phytophagous mammals. The characteristic of phytophagous animals’ feeding base has been given. The main emphasis in the collected material was put on ungulates, in particular on the elk as the largest dendrophage (wood-eating animal) of forest biocenoses in Russia.

Laburnum anagyroides Medik. is a popular ornamental tree native to the Mediterranean region. Its seeds are characterized of a physical dormancy, complicating seed reproduction. The present study was conducted to identify the seed dormancy breaking treatments to improve seed germination. The various stratification techniques (cold and warm treatments, alternate temperature regime) were tested. Simultaneously, the seeds were germinated in soil and on different nutrient media in vitro.

In this article we have looked into the matter of antibiotic resistance among the group of nosocomial strains Enterobacteriaceae which has been determined by the production of carbapenemases. In 2014 there were revealed four types of enzymes and six types of enterobacterias. The main causative agent of nosocomial infections and the major host of the acquired carbapenemases gene is Klebsiella pneumonia. There were cases of carbapenemases’ production about extramural flora of hospitalized patients.