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


Биология

Phenological Characteristics of Orthopterous Insects (Orthoptera) in the Volga-Kama State Nature Biosphere Reserve

In this brief communication, the results of the research on the seasonal dynamics of orthopterous insects (Orthoptera) are discussed. The research was performed in the Volga-Kama State Nature Biosphere Reserve. Field sampling and observations were carried out for different biotopes of the nature reserve. The phenological characteristics of 26 background species of the families Tettigonioidea, Tetrigidae, and Acridoidea were revealed.

Lymphatic Meningeal Role in Processes of Brain Clearing: in vivo Visualization

In the experiments on rats, Evans Blue dye and gold nanorods were injected into the brain parenchyma, followed by visualization with optical coherent tomography and a fluorescent microscopy. The results showed that meningeal lymphatics play an important role in the brain clearing, using markers introduced into the tissues. It has been shown that the deep cervical lymph node is the first anatomical “station” for the outflow of fluid from the brain. The data obtained shed light on the lymphatic mechanisms underlying the drainage and clearing of brain functions.

The Effect of Pollutants on the Emergence of Rifampicin Resistance in Bacteria of the Pseudomonas Genus

The anthropogenic pressure on ecosystems may contribute to the spread of antibiotic resistance among bacteria in natural conditions. Due to this, the aim of this work was to study the impact of specific biocides, antibiotics, pesticides and heavy metals on the emergence of rifampicin resistant mutants of Pseudomonas putida. To assess the impact of toxic substances on the emergence of rifampicin-resistant mutants the studied substances and rifampicin in the final concentration of 100 ?g/ml were added into nutrient medium before plating.

Development of Fluorescent Glioma in Rats under Pharmacological Modulation of Beta2-Adrenergic Receptor

This study shows the role of adrenergic mechanisms in the development of fluorescent glioma in rats and the impairment of the blood-brain barrier (BBB) permeability. The results demonstrate that the progression of glioma was accompanied by a gradual increase in the BBB permeability and an increased expression of vascular beta2-adrenoreceptors (B2-AR). The pharmacological blockade of B2-AR reduced the degree of BBB disruption, the migration of cancer cells and increased the survival of animals.

Preparation and Identification of the Molecular Properties of Alginate Synthesized by the Cultivation of Azotobacter vinelandii D-05

It is known that bacterial alginates are widely used in biomedicine as carriers in the immobilization of cells, enzymes and drugs. Their functional properties depend on their monomeric composition and molecular weight and vary depending on the source and the cultivation conditions. It was established that molasses (waste of sugar beet production) can be used as an effective and cheap source of nutrition for the growth of the bacterium Azotobacter vinelandii strain D-05 and the production of alginate.

Biometric Characteristics and Aerodynamic Properties of Pollen Grains of North American Pines under Conditions of the Southern Coast of the Crimea

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.

Developing the Algorithm of Increasing the Destructive Potential of Pseudomonas putida SU12 Native Strain Extracted From Phenol-Contaminated Soils

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.

Investigation of Interaction Between Silicon-Based Nanoparticles and HeLa Cells

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.

Photodynamic Diagnostics of Stomach Cancer

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).

Low Temperature Preservation of an Economically Important Cyanophyta Species (Spirulina, Arthrospira)

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.

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