Биология

The results of the study of biometric characteristics and aerodynamic properties of pollen of North American species: Pinus radiata D. Don, Pinus sabiniana Douglas, Pinus coulteri D. Don and autochthonous Pinus nigra subsp. pallasiana (Lamb.) Holmboe, grown on the Southern Coast of the Crimea (SCC) are presented. The differences in the size of the pollen grains and their individual parameters are revealed. The pollen of introduced species is characterized by large sizes in comparison with native species.

The article presents the development of methodological approaches to increasing destructive potential of Pseudomonas putida SU12 native strain extracted from phenol-contaminated soils. The cyclic selective method on gradual increase of phenol concentration in optoelectronics environment in combination with intermediate stage of accumulative culture is described. The authors proposed a discrete, stepwise increase in the concentration of phenol in elective media depending on degree of its destruction.

This work is about the investigation of the interaction of porous silicon submicron particles with the HeLa cervical cancer cell line. Substrates of the porous silicon were obtained with the two-staged chemical method based on synthesis of silver nanoparticles from silver nitrate AgNO3 with the subsequent etching with fluoric acid HF in the presence of hydrogen peroxide H2O2 and mechanical separation of microparticles by shattering. The thickness of the obtained porous silicon layer measured by scanning electrom microscopy (SEM), was about 2 mkm.

Cancer of the stomach is the main cause of death among cancer diseases of the gastrointestinal tract. This is due to the late diagnosis. This study was aimed at developing new methods for diagnosis of gastric cancer using a photosensitizer 5-ALK / PIXIX. The experiments were carried out on white non-native rats with an average mass of 250 grams. The animals were divided into 2 groups: control and experimental (stress + nitrosamine diet).

Spirulina and Arthrospira cyanoprokaryota species include a wide variety of laboratory microorganism culture collections and their traditional storage by means of isolate passages does not provide long-term preservation. The rationale for this study is to evaluate the possibility of long-term low temperature storage of Spirulina subsalsa and Arthrospira platensis cyanoprokaryota. Cyanoprokaryota biomass was stored for 12 months at minus 80 °С. The cooling rate was minus 1 °С.

The aim of this study was to identify the effect of precursor (vapor, winter wheat) on the non-traditional selective grain quality parameter intensity of spring common wheat. The parameters include dough development time, dough stability, energy absorbed by dough while kneading and starch retrogradation coefficient. The data have been obtained using a Mixolab device.

The tularemia microbe can be found in all landscape zones of the Northern hemisphere, and in the Russian Federation this infection has been detected in virtually all regions. It spreads beyond the polar circle up to the 71° parallel. From 100 to 400 cases of tularemia infection are registered in the Russian Federation annually, 75% of which are accounted for the Northern, Central and Siberian territories of the country. From time to time epidemic morbidity rates are reported. Presently, six types of natural tularemia foci are established in Russia.

The Collection Fund of the Laboratory of Ornamental Plants of the Main Botanical Garden named after N. V. Tsitsin of the Russian Academy of Sciences has currently 1055 species and varieties, as well as 4 995 varieties and garden forms. It was created on the basis of classical methods of introduction, such as (ecology)-geographical, phytocoenotic and the method of generic complexes. At the same time, the modern policy of forming the collection fund is aimed at creating not only large but also unique collections.

Atomic force microscopy in the study of bacterial cells allows the determination of such morphological parameters as: length, width, cell thickness, its perimeter, cross-sectional area, volume and root mean square roughness of the cell surface, which depends on the degree of laying of peptidoglycan and density of lipopolysaccharide. The aim of this work was to study the changes in the morphological parameters of the cell and the cell surface of bacteria when the temperature conditions of the culture medium change on the Y. pestis model.

Disturbances in the composition of microbiocenoses are warnings of changes in the physiological status of the organism, associated with the inhibition of immunobiological protection of the organism, its allergization, chronic intoxication, and increased susceptibility to infectious diseases. Some studies confirm the effect of magnetic radiation on abnormal characteristics both on the viability and growth rate of bacteria, and on the activity of various systems, in particular the antioxidant system and the lipid peroxidation system.