Biology

Modern Cadastre of Vectors and Other Reservoirs of Tularemia Microbe Found in Tularemia Foci of Different Types, Situated in the Territory of Russia

At the present stage of the studies only Ixodidae ticks can be classed by the types of foci, being the main blood-sucking vectors of the tularemia agent. Other blood-sucking arthropods, considering the species abundance and wide-spread occurrence and certain habitat versatility, can be tularemia vectors in several or even in all types of foci. These are the following: primarily, gamaside and argasid ticks, as well as bloodsucking insects.

The Coefficient of Replenishment for the Commercial Stock of Catfish from the Release of Its Juvenile by Weighing Batch of 2 Grams in the Reservoirs of the Volga-Caspian Fishery Basin

The practical value of the coefficient of commercial replenishment of fish stocks, due to the variety of its use in different areas of fisheries research, design work, restoration activities, and management decisions was highlighted. For many species of fish there is no information on the indicator under consideration. Catfish, one of the valuable commercial species, is included in this category.

Assessment of the Impact of the Nanoparticles of Silver Stabilized by Polymeric Compounds on Survival of Strains of Staphylococcus aureus

The antimicrobial activity of the nanoparticles of silver stabilized by various natural and synthetic polymeric compounds concerning reference and clinical strains of Staphylococcus aureus is studied. It is established that the greatest effectiveness was displayed by the silver nanoparticles stabilized by polyvinyl alcohol, carboxymethylcellulose and poliazolidinammonium, the modified iodine hydrate ions. The low sensitivity of the studied strains to action of the nanoparticles stabilized by an oleate of S.

Application of New Instrumental Methods for Evaluation of the Functional State of Cells of Francisella Tularensis in a Stressful Environment

The structure of the cell surface reflects the functional state of the bacterium as a whole. The presence of specific features of cells affects the biophysical characteristics of their surface: charge, free energy and hydrophobicity. The interaction of bacteria with biomolecules and particles is also related to these surface characteristics. The aim of our work was to study the function of F. tularensis 15 NIIEG cells under cultivation under stress using electro-optical (EO) monitoring.

Antimicrobial Photodynamic Effects Using Coatings Based on Metal Nanoparticles (Ag, Au)

The combined effect of coatings based on nanoparticles of metals Ag, Au, ultraviolet (365 nm, UVR) and infrared (808 nm, IRR) radiation on Staphylococcus aureus 209 P was studied. Decrease in numbers was shown by 2% in the case of silver coatings and by 8% in the case of gold coatings after 1 h incubation. However, exposure of the IRR to bacterial suspensions caused the death of 43% of the population after 5 min, 86% of the population after 30 min.

Changes in Blood-Brain Barrier Permeability under the Influence of Loud Sound

The development of methods of drug delivery to the brain is one of the priorities of the therapy of most cerebral diseases. There are more than 70 technologies to overcome the blood-brain barrier (BBB), but many of them are not widely used in daily clinical practice, as they lead to negative consequences. Here we propose a new method of overcoming the BBB using loud sound (110 dB, 370 Hz, duration – 2 hours).

The Phytotesting of (thio)semicarbazones 2,4-diarylbicyclo[3.3.1]non-2-en-9-ones

Biological testing of (thio) semicarbazones 2,4-diarylbicyclo [3.3.1] non2-en-9-ones, differing in the nature of aryl substituents and nucleophile, was carried out.The object of the study was seedlings of spring soft wheat Triticum aestivum L. of the Saratovskaya 36 variety. To assess the physiological activity of the tested compounds, we used a valuable analysis of the morphometric parameters of growth of the root system and shoots of the test and control plants and the quantitative content of chlorophyll a, chlorophyll b, and carotenoids in the first leaf.

Vitality Structure and Ontogenetic Strategy of DeLPHINIUM litwinowii (Ranunculaceae)

The article presents the results of a study of the vitality structure of four Delphinium litwinowii Sambuk coenopopulations from the Penza, Tambov and Voronezh regions in the period from 2017 to 2018. The most northern coenopopulation from Penza region in 2017 showed the strongest vitality, while the weakest was the Voronezh’ coenopopula- tion, located to the south, near the village of Vladimirovka. Most of the coenopopulations over the observation period are rated as prosperous; coenopopulation from the vicinity of the village of Vladimirovka is de- fined as depressive.

Induction of Direct Organogenesis in the Culture of Mature Embryo in Maize

Regeneration of plants in vitro through direct organogenesis allows the avoidance of somaclonal variation. The aim of our study was the induction of direct organogenesis in the culture of mature embryo in maize lines created at Saratov State University: ATTM (bm, wx, y), ATTM (bm, y), ATTM (bm, g, V-type CMS), AT-3 (4n). These lines are characterized by genetic predisposition to parthenogenesis. The mature embryos isolated from sterile grains were used as a primary explant.

Polysaccharidebased Biological Activity of Extracts Isolated from Fruits of Crataegus Monogyna of Varying Degrees of Maturity

The fruits of midland hawthorn (Cratae gusoxyacantha L.), as well as leaves and flowers have a complex composition. A water-soluble polysaccharide complex, flavonoids and saponins, and other biologically active compounds were revealed in them. Consequently, preparations made from the vegetable material of hawthorn have a high biological activity. A liquid extract of fruits and a tincture of hawthorn flowers, are widely used in medicine. These drugs are used for cardiovascular diseases, have a sedative and hypotensive effect.

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