No 2 (2020)

Articles
SOIL MICROBIAL COMMUNITIES AS A SOURCE OF STRAINS FOR THE BIOLOGICAL PROTECTION OF SOYBEANS AGAINST FUSARIUM IN THE YENISEI SIBERIA
Rodovikov S.A., Churakov A.A., Popova N.M., Khizhnyak S.V.
Abstract
Eighteen strains of bacterial antagonists inhibiting growth of Fusarium pathogens of soybean were isolated from soil microbial communities of the Yenisei Siberia. The two most active antagonists (RSA-1 strain, preliminary identified as Bacillus sp., and RSA-13 strain, preliminary identified as Streptomyces sp.) were tested as biological agents to protect soybeans from Fusarium infections in vitro . In the absence of artificial infection, the RSA-1 strain reduced the Fusarium incidence by 25 percentage points (from 61.5% to 36.5%, the statistical significance of the effect was p <0.001), and the RSA-13 strain reduced the Fusarium incidence by 32 percentage points (to 29.5%, the statistical significance of the effect p <0.001). Artificial infection of soybean with Fusarium increased the disease incidence up to 83.5% and reduced the length of seedlings by 1.9 times. In case of artificial infection with Fusarium , the RSA-1 strain statistically significantly (p <0.001) reduced the incidence of the disease by 29 percentage points and statistically significantly (p <0.001) reduced the inhibitory effect of the infection on seedling growth. Strain RSA-13 did not affect the incidence of the disease, however, statistically significantly (p <0.001) reduced the inhibitory effect of infection on the growth of seedlings.
Bulletin of Nizhnevartovsk State University. 2020;(2):4-11
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CULTIVATION OF MYCELIUM AND THE STUDY OF THE PHYTOPATHOGENICITY OF CERTAIN XYLOTROPHIC BASIDIOMYCETES UNDER IN VITRO CONDITIONS
Maramokhin E.V., Sirotina M.V., Zontikov D.N.
Abstract
The paper discusses the cultivation of the mycelium of some economically significant xylotrophic basidiomycetes using methods of clonal micropropagation. For cultivation, Chapek, Murashige-Skoog synthetic synthetic media are used, a comparative analysis of mycelium growth in these media is carried out. Particular attention is paid to the study of the phytopathogenic properties of mycelium obtained in vitro. Two variants of phytopathogenicity are being studied: the cultural one, which is associated with the nature and intensity of mycelium growth on a nutrient medium, and phytopathogenicity for anatomical structures during the joint cultivation of xylotrophic basidiomycetes mycelium with parts of shoots from B. pendula and P. tremula . Significant variability was shown both in the expansivity of mycelial growth and in the manifestation of the degree of phytopathogenicity in different types of xylotrophs. Microscopy of the in vitro mycelium obtained was also carried out in order to more accurately identify the organism under study and to study the anatomical and morphological features. In general, this study will make it possible to better understand the ecology of these organisms in vivo, to model the interaction of the host parasite, and to more quickly and accurately conduct a specific determination of the phytopathogen, which can be used when conducting sanitary-protective and other economic activities in the forest industry.
Bulletin of Nizhnevartovsk State University. 2020;(2):12-18
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STRUCTURAL AND FUNCTIONAL INDICATORS OF BACTERIOPLANKTON OF THE SOUTH STRETCH OF LAKE MUNOZERO (KARELIA)
Makarova E.M.
Abstract
In article are presented the results of the state of the pelagic part of the south stretch of Lake Munozero (Karelia) according to microbiological indicators for the growing season of 2018. In the furtherance of this goal, 27 water samples were chosen in May, July and September at different strata. Munozero Lake is one of the unique lakes of Karelia due to its high salinity (100 mg/l), low-nutrient water sand organic substances. The total number, cell size dimensional structure and biomass of bacteria were determination by method of luminescence microscopy, by means of filtration through black nucleopore track membranes, after coloration bacteria by acridine orange. The total abundance of bacteria varied from 0,66 to 1,85 million cells/ml, and the biomass from 0,13 to 0,66 g/m3. The average cell volume varied in the range 0,18-0,34 μm3. Coccus form of bacteria prevailed in numbers. The doubling time and bacterial production were determined by the method of isolated samples. Bacterial production varied between 0,01 and 0,07 g/(m3•day-1). Specific growth rates (day-1) ranged around 0,05-0,2, giving doubling times of 70-364 h. The average daily production for the growing season was 0,65 g/m3•day-1. The physiological activity of bacteria was greatest at the end of the growing season. During the research period, the abundance of saprophytic bacteria growing on fish peptone agar was in the range of 19-550 CFU/ml. the abundance of oligotrophic bacteria growing on from starvation agar variable 200 to 850 CFU/ml. During the study period Water of the south stretch of the Lake Munozero was estimated as clean - moderately polluted with an intermediate quality class of 2-3. The south stretch of the Munozero is characterized as a mesotrophic water body.
Bulletin of Nizhnevartovsk State University. 2020;(2):19-25
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IMPACT OF GAS FLARING ON ALGAE IN YUGRA RAISED BOGS
Skorobogatova O.N., Semochkina M.A., Moskalyova A.S.
Abstract
The research was aimed at studying the impact of thermal radiation from gas flaring on algal communities in raised bogs in Khanty-Mansi Autonomous Okrug - Yugra, Russia. The qualitative and quantitative parameters of the studied communities were evaluated at different distances from the flare that had been operating continuously for more than thirty years. The two-year algological field study identified 128 algae of seven phyla, inhabiting the northern sector of the circular area around the gas flare. The most numerous groups in the samples were green algae Chаrophyta, followed by diatoms, euglena and cyanobacteria. The lowest values of qualitative and quantitative indicators were observed in algae 100 and 50 m away from the gas flare. The species diversity and abundance of algae were maximal in the control site dominated by Charophyta. In cyanobacteria, Chrysophytaand diatoms, all the indicators increased with distance from the flare. Euglena were evenly distributed over the sites, which indicates a high tolerance to oil and organic pollution. On drawing nearer to the gas flare, the algocenoses were observed to have small-celled morphology and poorer diversity, some regional forms disappeared and the abundance of algae decreased. This research can provide a basis for a bioindication method to determine the environmental status of water bodies and the degree of pollution in raised bogs. The findings can be recommended as scientific data for decision making and pollution monitoring.
Bulletin of Nizhnevartovsk State University. 2020;(2):26-32
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TOLERANCE OF ADVENTIVE MACROPHYTE LEMNA GIBBA L. TO COPPER IONS: RANGE EVALUATION
Shchukina D.A., Borisova G.G., Maleva M.G.
Abstract
In recent decades, adventitization processes in flora have become more vigorous, which poses a threat to biodiversity. Adventive plant species occupy new territories, including transformed ones, and oust native species. In this regard, it is relevant to study the tolerance range of alien species to high technogenic loads since it can help assess the spread of adventive plants. The aim of the research was to study the response of the adventive macrophyte Lemna gibba L. to the copper ions action in a gradient from 0 to 10 mg/L. Duckweed fronds were incubated in model systems for six days under natural light conditions. A high positive correlation between copper content in the nutrient solution and plants was revealed. Moreover, the rise of metal accumulation was exponential. With an increase in copper concentration ≥ 0.5 mg/L, its phytotoxic effect manifested itself through the increased prooxidant content and the depigmentation of fronds due to the photosynthetic pigments degradation. At the maximum copper concentration (10 mg/L), the chlorophyll content was 2.5 times lower, and carotenoids, 11.5 times, as compared to the control sample. The study assessed L. gibba tolerance range to the copper ions action and identified physiological and biochemical parameters that can serve as toxicity biomarkers.
Bulletin of Nizhnevartovsk State University. 2020;(2):33-41
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STIMULATING AND TOXIC EFFECTS OF COPPER AND COBALT NANOPOWDERS ON RICE SEEDLINGS
Obidina I.V., Churilov G.I., Polischuk S.D., Tarara A.Y., Gomozova S.S., Rybin N.B., Ampleeva L.E.
Abstract
Metal nanopowders have a stimulating effect on the growth and development of plants. The biological activity of nanoparticles depends on size, concentration, and chemical composition. Nanoparticles require further study because they have a wide range of applications in medicine and agriculture. Being biocompatible, copper and cobalt can play the role of growth stimulant, are not toxic and can be used for contact with living systems. The object of study was rice, as an economically important culture. The study addressed the effect of cobalt and copper nanoparticles on the germination and development of rice seedlings. The optimal concentration of ultrafine solutions of these nanopowders for pre-sowing treatment of seeds was determined. Although copper and cobalt have different chemical nature, the nanoparticles show similar impact and doze-dependent effect. Minimum concentrations of the nanoparticles had a positive effect on the morphological and biometric indicators of sprouts. The activity of oxidase enzymes was measured and it showed a reversible nature of oxidative stress. An increase in superoxide dismutase activity and a decrease in catalase activity by less than 30% indicates the stress resistance of rice sprouts and the absence of phytotoxic effects of the nanopowders. The presence of these metals in the seedling homogenate was determined to define the toxic effect. The electron microscopic analysis of the partition of metals in the tissues of experimental plants did not reveal significant deviations from control values. The experiments were performed using scientific equipment of Regional Center for Collective Use of Probe Microscopy in Ryazan State Radio Engineering University.
Bulletin of Nizhnevartovsk State University. 2020;(2):42-52
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A TECHNOLOGY OF ESSENTIAL OIL CROPS GROWTH IN CLOSED SYSTEMS
Makarov P.N., Makarovа T.A., Samoylenko Z.A., Gulakova N.M.
Abstract
The article describes the results of growing essential-oil crops in photoculture using the hydroponic method, and the stages and the agrotechnical methods of conveyor production for spice-flavoring plants such as dill (Goldkrone cultivar), parsley (Fidelio cultivar) and basil (Lemona cultivar). Due to underdevelopment of agriculture in cold climate, the northern territories of Tyumen region receive plant products from the South of Russia. Therefore, effective technologies for plants growing are required in order to provide the northerners with fresh products all year round. Regarding growing plants in a closed system, we discovered that the best conditions in the light culture for ethereal crops are created by white LED lighting with 8000 lm luminous flux. Plants watering with the Ferticare fertiliser in combination with calcinitis and watering regime (15 minutes every 24 hours) allow to achieve high productivity and yield of the cultivated plants. For the conveyor cultivation of fennel, parsley and basil, it is necessary to maintain the optimal microclimate parameters: day-time ambient air temperature +23℃, the solution temperature +20℃, humidity - no less than 60%. The developed method gives 8-9 turnovers of spice-flavoring plants per year.
Bulletin of Nizhnevartovsk State University. 2020;(2):53-59
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ADAPTATION POSSIBILITIES OF INTRODUCED PLANTS OF VARIOUS ORIGIN IN CONDITIONS OF BOTANICAL GARDEN AT SURGUT STATE UNIVERSITY
Turbina I.N., Kukurichkin G.M.
Abstract
The botanical garden in Surgut is the northernmost in Western Siberia and one of the northernmost botanical gardens in Russia. It is the major point for promoting new agricultural and biological technologies to the Far North. Currently, the collection of ornamental plants of the Surgut botanical garden comprises about 200 species and varieties of herbaceous plants belonging to 60 genera and 32 families, and about 210 species, forms and cultivars of woody plants. The research objective is to study the adaptation mechanisms of some ornamental plants from the collection of the botanical garden using the up-to-date portable flavonoid and chlorophyll meter DUALEX. The research objects are five species of herbaceous plants of genus Iris L. - Iris hungarica Waldst. &Kit., Iris variegata L., Iris sibirica L., Iris glaucescens Bunge, Iris sulfurea C. Koch. and eight species of woody plants of genus Acer L. - Acer pseudoplatanus L., Acer rubrum L., Acer trautvetteri Medw., Acer tataricum L., Acer ukurunduense Trautv. & C.A. Mey., Acer spicatum Lam., Acer mandshuricum Maxim., Acer ginnala Maxim. The range of nitrogen balance (Nbi) in herbaceous plants varied from 32.2 to 39.7, and the chlorophyll content was from 48.1 to 58.6 mg/cm2. In woody plants, the content of chlorophyll (Chl) ranged from 23.9 mg/cm2 ( Acer spicatum ) to 31.3 mg/cm2 ( Acer rubrum ), i.e. only 1.3 times within the group species growing on one flank. The content of flavanols in woody plants ranged from 1.3 mg/cm2 in Acer mandshuricum to 1.9 mg/cm2 in Acer ukurunduense . The maximum values of Nbi, Chl indices for Iris hungarica and Acer pseudoplatanus are an adaptive reaction to growing conditions and indicate the formation of plantprotective functions. The pigment content of leaves in ornamental plants indicates their satisfactory physiological state, as evidenced by a slight variation in biochemical parameters among the tested groups of ornamental plants.
Bulletin of Nizhnevartovsk State University. 2020;(2):60-67
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ECOLOGICAL-PHYTOCENOTIC ANALYSIS OF THE FIELD LAYER OF URBAN RECREATIONAL FORESTS (ON THE EXAMPLE OF KALUGA AND OBNINSK)
Evseeva A.A.
Abstract
The aim of this study is to study the diversity of the ecological-coenotic structure of the field layer of the residual urban forests, using as an example the cities Kaluga and Obninsk, which have different approaches to the conservation of residual forest communities in the city. Obninsk practices the conservation of forest zones that have entered the urban environment as recreational objects, while in Kaluga, such forest communities are in a state of interrupted succession and have experienced forestry activities. The objectives of the study are to study the ecological-coenotic and ecological-biological spectra of the field layer of forest ecosystems, and to identify adventive and protected plant species. The study took place in 2014-2015. In the forest communities under study, 30 sites were selected for geobotanical descriptions by the Braun-Blanquet method at different periods of the growing season (in June and August) to fully cover floristic diversity. A total during the observation period were made 240 floristic descriptions. Kaluga city forests turned out to be more susceptible to negative changes occurring in conditions of recreational forest management. The field layer of the Kaluga forest recreational zones turned out to be more susceptible to negative changes occurring under the influence of anthropogenic pressure, in comparing with the Obninsk forest recreational zones. This is expressed in the proportion of ecological-coenotic and ecological-biological groups, the presence of a greater number of alien species in the studied communities of Kaluga, which indicates greater resistance to the recreational load of the city forests of Obninsk. For example, the share of the group of forest habitats is much higher in Obninsk, where forest species make up more than half of all types of grass layer (54,2%). In the Kaluga forests, the share of forest habitats is lower and amounted to 47,5%. The discovered difference in the stability of the field layer of the Obninsk forests is presumably due to the strategy of their conservation in the urban area in a state of natural succession. The practical significance of the results obtained can be the possibility of using them to determine the degree of negative changes in recreational forests. The direction of further research can be directed at organizing monitoring of the urban forests of Kaluga and Obninsk according to the state of the field layer.
Bulletin of Nizhnevartovsk State University. 2020;(2):68-75
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INFLUENCE OF MORPHOMETRIC PARAMETERS OF RIVER BASINS ON TAXONOMIC RICHNESS OF FLORA (BY THE EXAMPLE OF THE TOM RIVER BASIN)
Sheremetov R.T., Galakhov V.P.
Abstract
The article deals with methodological issues of studying the influence of morphometric parameters of model basins (size, nature of the river network, shape) of the Tom river on the taxonomic structure of flora. Taking into account significant differences in the morphometric of river basins, which determine the diversity of environmental conditions in the Tomi river basin, 22 model basins were identified. Morphometric of model basins is determined by 25 parameters characterizing the main sizes of basins (area, length, width, height, etc.), features of the river network (length and number of rivers, etc.), as well as various forms of river basins. The indicators of floristic wealth are accepted: the number of species, the number of genera and the number of model pool families. The author considers the conditionality of taxonomic diversity of flora by morphometric characteristics of basins for three levels-species, genus and family. Morphological parameters of model basins vary widely, which determines the diversity of plant habitats. However, the size, features of the river network and shape are not equivalent to the richness of the flora. Taxonomic richness at each level (species, genus and family) depends primarily on the morphometric of river basins. It is established that the altitude parameters are significant, especially the maximum height, the amplitude of the height or fall of the river, and the dependence is high (α = 0,05 df = 20). The nature of the river network and the shape of the basins for taxonomic richness are not essential. The most important morphometric features of basins by the number of taxa of different hierarchical ranks include the same set of parameters of the basin, primarily the height and their maximum values, the amplitude of fluctuations in the height or fall of the river. At the species level, the significance of other parameters is much lower. A similar relationship is obtained at the genus and family levels. This changes not only the proximity of the relationship with the change in taxonomic rank, but also the number of the most significant morphometric parameters. The article contains 10 Tables, 27 References.
Bulletin of Nizhnevartovsk State University. 2020;(2):76-89
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SEASONAL VARIATION OF SPIDER SPECIES COMPOSITION IN VOLGOGRAD AGGLOMERATION
Hnykin A.S., Ivantsova E.A.
Abstract
The article addresses changes in the species composition of spiders during the warm season. The qualitative and quantitative characteristics of the spider community were analyzed during the most important periods of their activity in the main biotopes of the Volgograd agglomeration. The Cluster Analysis application, based on the Jaccard index, was used. The material was collected using 10 mm Barber soil traps with a fixing liquid (6% acetic acid solution). In total, 235 species of spiders belonging to 26 families were identified, including 195 species belonging to 23 families on the territory of Volgograd. Notably, 155 species were new to the fauna of the Volgograd region. Species Trichoncus villius Tanasevitch et Piterkina was found in the Russian Federation for the first time. The species composition was analyzed during critical periods of spider life: the end of winter diapause, the time before the summer diapause, the termination of summer diapause, and the period of before winter the diapause. In each case a set of traps were exposed for seven days. The spring period was characterized by the maximum number of species, and the maximum similarity in species composition was observed between the moment when spiders leave the winter diapause and the period before the summer diapause. During the warm season, the species composition changed almost completely twice: before the end of the summer diapause and at the end of the warm season, approaching the spring values. These changes were significantly less relevant to near-water biotopes, where environmental conditions were more stable compared to the other studied biotopes.
Bulletin of Nizhnevartovsk State University. 2020;(2):90-96
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MATERIALS FOR THE STUDY OF THE FAUNA OF COLEOPTERA SPECIALLY PROTECTED NATURAL AREAS OF THE ALTAI TERRITORY (THE MOUTH OF THE PESCHANAYA RIVER)
Psarev A.M.
Abstract
The Altai Territory is notable for its poorly studied entomofauna of specially protected natural areas. The work first provides the results of the study of the fauna of necrophilous Coleoptera on the territory of the natural monument "The Mouth of the Peschanaya River". The collection was conducted with the help of soil traps with bait. 51 species from 7 Coleptera families were found. Carabidae and species of other families not belonging to the ecological group under study were not taken into account. Staphylinidae was the most numerous in terms of species (54,9% of the total number of species), significantly inferior to Silphidae and Scarabaeidae (13,7% and 9,8% respectively), the share of the remaining four families ( Histeridae, Leiodidae, Hydrophilidae, Dermestidae ) was 21,6% in total. Silphidae ( Nicrophorus vespillo, Oiceoptoma thoracicum , etc.) dominated the numbers. The dominant species ( Nicrophorus vespilloides ) belongs to the same family. Common and numerous were Anoplotrupes stercorosus, Aphodius rectus ( Scarabaeidae ), Sciodrepoides watsoni ( Leiodidae ). Of staphilinids, the most numerous in terms of species were not dominant, only three species ( Philonthus cruentatus, Aleochara curtula, Drusilla canaliculata ) had the second class of abundance, the rest were single species, from 1 to 4 individuals. In Staphylinidae, in addition to the usual herpetobionic and necrophilous species, species characteristic of the banks of reservoirs ( Philonthus quisquiliarius, Bledius sp.), fungi ( Oxyporus maxillosus, Gyrophena sp.) were present in the collections. An assessment of species richness, dominance and equilibrium in the community of necrophilous Coleoptera showed average values of Shannon index (H = 2,2), Berger-Parker index (d = 0, 0,43) and Pielou’s evenness index (E = 0, 0,57).
Bulletin of Nizhnevartovsk State University. 2020;(2):97-101
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ECTOPARASITES OF A STEPPE LEMMING LAGURUS LAGURUS PALLAS, 1773 IN THE SOUTH TRANS-URAL REGION (KURGAN OBLAST) IN CONNECTION WITH THE NATURAL FOCI OF TULAREMIA
Starikov V.P.
Abstract
Steppe lemming of the South Trans-Ural region is a rare species of open spaces. To the north, its distribution is limited to the subzone of herb-bunchgrass steppes and the southern strip of the forest-steppe subzone. The presented work summarizes the material, which gives the full species composition of the parasitic arthropods of this rodent, and gives quantitative characteristics of ectoparasites. In total 155 individuals and one nest of steppe lemming were examined for ectoparasites. There are 808 parasitic arthropods of 20 species, including 14 species of gamasid mites, 2 species of ixodid ticks and 4 species (subspecies) of fleas. According to the number of individuals of ectoparasites feeding on the steppe lemming, the dominance of gamasid mites is strongly pronounced, both prevailing multi-host species and specific, typical for other rodents (gray and red-backed voles, northern mole vole, Eurasian water vole, northern birch mouse). The contribution of ixodid ticks and fleas to the parasitofauna of the steppe lemming is small. Steppe lemming can be involved in circulation of a causative agent of tularemia in the South Trans-Ural region, but as an additional carrier in maintenance of a foci in biotopes, where it contacts the habitats of the Eurasian water vole.
Bulletin of Nizhnevartovsk State University. 2020;(2):102-109
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SEASONAL MICROALTERNATIONS OF ECG SIGNAL IN STUDENTS OF A NOTHERN UNIVERSITY
Pogonysheva I.A., Lunyak I.I., Pogonyshev D.A.
Abstract
The research addresses the seasonal dynamics of electrophysiological properties of the myocardium in students who live and study in the Khanty-Mansi Autonomous Okrug -Yugra, Russia. The main method of the research was the dispersion mapping of low-amplitude cardiocycle oscillations. The indicators of the electrophysiological properties of the myocardium were recorded in the Human Ecology Laboratory of Nizhnevartovsk State University using the CardioVisor-06s computer-based heart screening system. Eighty 2nd and 3rd year students participated in the research. Microalternations of the ECG signal were recorded four times per year, once in each season. The electrophysiological activity of the myocardium was analyzed and showed seasonal dynamics. The myocardial microalternation index and the Rhythm indicator increased from summer to winter and reached maximum in spring. Increased integral indicators of dispersion mapping in spring may indicate the climatic impact. The transitional season puts greater stress on the functional reserves of the body, which was manifested by the observed alternations in the electrophysiological activity of the myocardium. The maximum heart rates in spring indicate a lower efficiency of the heart muscle and the exhaustion of the chronotropic reserve. The increased values of the Rhythm indicator also point to a greater tension in the regulatory system in the cold seasons. At the end of winter and in spring, the myocardial activity in students of Nizhnevartovsk State University reached the upper limit of the physiological norm and their functional reserves were reduced.
Bulletin of Nizhnevartovsk State University. 2020;(2):110-115
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EVALUATION OF MORPHO-PHYSIOLOGICAL CHARACTERISTICS OF STUDENTS LIVING IN NORTHERN CONDITIONS
Osin M.V., Maltsev V.P.
Abstract
The study focused on the physical development indicators in younger teens aged 11-12 (Group 1) and 13-14 (Group 2) living in northern conditions (Surgut, Russia). The data was collected and processed in spring from February through March 2020. The physical development, the functional state of the cardiovascular system and the functional body reserves were assessed by anthropometric and hemodynamic indicators. It was found that the physical development was harmonious in the majority of examined teenagers. Among elder teenagers, more boys had good physical development, while more elder girls showed signs of asthenization. Hemodynamic parameters reflected the improved functioning of the cardiovascular system in relation to age. The integrative indicators of heart rate hemodynamics and arterial blood pressure were above the age-sex norm, which indicates stress on the vital systems. The adaptation reserves in teenagers of both groups were reduced during the spring period: 47-66 % of teenagers in Group 1 and 57-68 % of teenagers in Group 2 demonstrated unsatisfactory adaptation indicators.
Bulletin of Nizhnevartovsk State University. 2020;(2):116-123
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INTER-GENDER FEATURES OF HEMODYNAMICS RHYTHMS IN NORTHERNERS WITH IMPAIRED VEGETATIVE REGULATION OF ARTERIAL PRESSURE
Surinov D.V., Ragozin O.N., Shalamova Y.Y., Shevnin I.A.
Abstract
Patients should be examined for blood pressure regulation disorders starting from a young age though adolescence and young adulthood. In this aspect, it is necessary to pay attention to neurocirculatory dystonia, as a phenomenon of impaired adaptation to changing environmental and internal conditions in which the neurohumoral regulation of various body systems, including cardiovascular, can be violated. The aim of this work was to study the inter-gender characteristics of blood pressure rhythms and heart rate in patients with hypertensive neurocirculatory dystonia living in the northern region. Wavelet analysis was used to test the hypothesis of numerous cyclicities. In patients with neurocirculatory dystonia, especially in women, the circadian structure of hemodynamic rhythms was observed to decay with an increased average daily value. The violation of vegetative regulation of arterial pressure rhythms was present in the examined northerners in the form of mesor, hyper-amplitude and ultradian desynchronosis.
Bulletin of Nizhnevartovsk State University. 2020;(2):124-129
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SEX AND AGE CHARACTERISTICS OF DAILY ACTIVITYOF DISTANCE LEARNING STUDENTS IN NORTHERN CLIMATE
Ragozin O.N., Shalamova Y.Y., Ilyushchenko N.A., Ragozina O.V., Shevnin I.A., Surinov D.V.
Abstract
The purpose of the work is to study the time preferences of students performing daily tasks during distance learning and to determine if such preferences depend on sex and the year of study. In the absence of social regulation, the daytime and nighttime activity of students corresponded to the distribution of chronotypesthat typifies a northern region, with arrhythmic and evening types prevailingbut the morning biorhythmic stereotype having a minimal representation. With no ‘master timer’ in distance learning, students demonstrated pronounced sex differences in the daily dynamics of performance. Young femaleshad maximum performanceduring the day and minimum performanceat night, which corresponds to the most common type. Young males were observed to have several ascents in their performance during the 24-hour period. First-year and second-year students’ learning behavior was less synchronized with the day-night cycle. The wavelet analysis found insignificant four to five hourrhythmic fluctuations thatoccurred in the evening hours, during the period of students’ high educational performance.
Bulletin of Nizhnevartovsk State University. 2020;(2):130-135
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MOBILE FORMS OF METALS IN SOILS IN THE NADYM-PUR INTERFLUVE (WESTERN SIBERIA)
Romanenko E.A., Moskovchenko D.V., Kudryavtsev A.A., Shigabaeva G.N.
Abstract
The total concentrations of metals (Fe, Mn, Cu, Ni, Cr, Sr) and their mobile forms extracted by an ammonium acetate buffer (pH = 4,8) were studied in soils samples collected from Nadym-Pur interfluve (West Siberia), near the northern limit of the taiga zone. The heavy metal content was determined in 55 background soil samples and in 25 pyrogenic ones. Gross content was determined on a spectrometer "SPECTROSCAN MAX-GV" using x-ray fluorescence analysis. Mobile forms of metals were determined on a ContrAA 700 atomic absorption spectrometer by flame and electrothermal methods. The statistics are calculated using the Excel software package. The study confirmed the weak accumulation of metals in the soils of the northern regions of Western Siberia. The total content below the soil world average for Fe is 5 times, Mn - 3 times, Sr - 2 times, Cr - 1,4 times. The content of mobile forms varies widely depending on the amount of organic matter. The percentage of mobile forms of metals from the total content was: Cr - 0.84%, Fe - 1,2%, Sr - 3,8%, Mn - 8,7%, Ni - 15%. In the profile of podzols, the distribution of mobile forms of metals has an eluvial-illuvial character. Mn and Sr accumulate intensively in the surface organogenic horizons, and the Fe content increases in the BF horizon. Minimum values are marked in horizon E. In pyrogenic soils, there is an increase in the content of mobile forms of metals due to the intake of ash. Metal content usually not exceeded the maximal permissible concentrations for soils.
Bulletin of Nizhnevartovsk State University. 2020;(2):136-145
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MONITORING OF NATURAL COMPLEXES WHILE DEVELOPING AND OPERATING THE FIELDS OF TIMAN-PECHORA OIL AND GAS PROVINCE
Storchak T.V., Didenko I.N., Didenko N.A.
Abstract
Landscape monitoring is organized to monitor the state of natural complexes and their transformation. Monitoring of landscapes should ensure the identification of anthropogenic load, the dynamics of areas of anthropogenic impact, the degree of degradation of natural complexes. The Timan-Pechora oil and gas province is located on the territory of the Republic of Komi, the Nenets Autonomous Okrug and the adjacent water area of the Pechora Sea. The area of the province is 600 thousand km2. Currently, the development and extraction of mineral resources, mainly oil and gas, is actively underway in the territory under consideration. This is a complex process that requires the collaboration of many specialists, including ecologists. In the Bol'shezemel'skaya Tundra, the dominant part of tundra landscapes are extremely sensitive to anthropogenic influence and the unorganized use of the available space will soon lead to the complete loss of their own functions, and their restoration will take a huge amount of time. In this paper, a basic field study method was chosen as the main method to study the landscape. Thanks to route observations, a complex landscape characteristic of the territory was compiled.
Bulletin of Nizhnevartovsk State University. 2020;(2):146-150
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BIOINDICATOR ASSESSMENT OF AIR QUALITY IN ARMIZONSKOYE VILLAGE, TYUMEN REGION
Akatyeva T.G.
Abstract
In the town of Armizonskoye, Tyumen Region, Russia, industrial enterprises emit more than 230 tons of various pollutants into the air, and only about 50% of that total is retained. In this work the quality of atmospheric air in Armizonskoye was studied using the bioindication method. The objectives of the study were to identify the main pollutants in the air and to determine the most sensitive test functions of woody and herbaceous plants. The chemical method was used to determine the quantity and array of substances, emitted by some enterprises in different parts of the town. The bioindicators were common dandelion Taraxacum officinale Wigg, great plantain Plantago major L., warty birch Betula pendula Roth, and boxelder maple Aceraceae nequndo. The chemical analysis showed that the air is mainly polluted with iron oxide, manganese compounds, and suspended solids. The main sources of pollution are utility companies, Armizonagrostroy, and road maintenance companies. The most sensitive indicator among woody plants was boxelder maple, and among herbaceous plants, common dandelion. The bioindication method helped to map more and less polluted territories.
Bulletin of Nizhnevartovsk State University. 2020;(2):151-156
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