9 results on '"A. Lebedeva"'
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2. Spatiotemporal Dynamics of Forest Vegetation and Their Impacts on Soil Properties in the Forest-Steppe Zone of Central Russian Upland: A Remote Sensing, GIS Analysis, and Field Studies Approach.
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Chendev, Yury G., Lupo, Anthony R., Terekhin, Edgar A., Smirnova, Maria A., Gennadiev, Aleksandr N., Narozhnyaya, Anastasia G., Lebedeva, Maria G., and Belevantsev, Valery G.
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FOREST plants ,FOREST dynamics ,VEGETATION dynamics ,FIELD research ,REMOTE sensing - Abstract
This article showcases the outcomes of a comprehensive spatiotemporal dynamic analysis conducted in forest vegetation areas within the forest-steppe zone of the Central Russian Upland (eastern Europe), spanning the period from 1970 to 2020. This study utilized high-resolution data from the Corona satellite system from the year 1970 as well as satellite imagery from the ArcGIS World Imagery database. Soil properties and their changes were assessed based on the analysis of soil bulk density (930 samples), soil organic carbon features, pH, available phosphorus, and the composition of salt extracts (1362 samples). We collected and analyzed 3920 soil samples in the field to study the impact of shelterbelts on soil moisture over a period of two years. For six selected key sites with a total area of 1722 km
2 , it was found that over a 50-year period, the area covered by forest vegetation increased from 14% to 24%. This expansion was primarily due to the planting and growth of young shelterbelts in the 1970s–1980s as well as widening anti-erosion shelterbelts on slopes and gullies. The average linear growth rate of forest vegetation boundaries was found to be 23.5 m (4.7 m per decade) for the entire study area. The expansion was highest on west-facing slopes, which was attributed to the higher moisture content from windward atmospheric precipitation events. However, alongside the increase in forest cover, degradation was also observed, particularly in old-age shelterbelts, which was attributed to increased fragmentation and mortality. A gradual increase in the extent of shelterbelt degradation was observed from the northwest to the southeast within the forest-steppe region, corresponding to areas with a drier climate. Additionally, the impact of shelterbelts on soil properties and soil cover was analyzed using four key sites and using fields and laboratory research methods. We detected a lateral uptake of substances from plowed soils into the soils of shelterbelts and vertical uptake from deep layers. The two-year observations (2020 and 2021) of soil moisture during the growing season (May–September) in two climatically contrasting forest-steppe areas revealed a more intensive accumulation of soil moisture in fields west of shelterbelts compared to those to the east of them, particularly within the 10 m zone near the shelterbelts. This can be attributed to arable fields on the windward side receiving more moisture compared to the leeward side. The formation of striped microstructures in the soil cover that occurred under the shelterbelts and on adjacent arable lands was influenced by various factors such as microclimatic conditions, vegetation types, ecological conditions for soil fauna, and human-induced soil processing and transformation along the shelterbelt boundaries. Shelterbelts and their adjacent areas in agro-landscapes are considered to be self-developing natural–anthropogenic geosystems with their own organizational structure. Therefore, their study is recommended as an integral part of modern geographical zoning. [ABSTRACT FROM AUTHOR]- Published
- 2023
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3. Sleep Mediates the Association Between Stress at Work and Incident Dementia: Study From the Survey of Health, Ageing and Retirement in Europe.
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Tan, Xiao, Lebedeva, Aleksandra, Åkerstedt, Torbjörn, and Wang, Hui-Xin
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SLEEP interruptions , *JOB stress , *RETIREMENT age , *PROPORTIONAL hazards models , *HEALTH surveys - Abstract
Background Both psychosocial stress at work and sleep disturbance may predispose impaired cognitive function and dementia in later life. However, whether sleep plays a mediating role for the link between stress at work and subsequent dementia has yet to be investigated. Methods Data from the Survey of Health, Ageing and Retirement in Europe were used for the study. A cohort of 7 799 dementia-free individuals (aged 71.1 ± 0.2 years) were followed up for a median of 4.1 years for incident dementia. Job demand and control were estimated using questions derived from the Karasek's Job Content Questionnaire. Sleep disturbance was ascertained by a question in the EURO-Depression scale. Cox proportional hazard models adjusted for age, sex, education, cognitive test score, and other potential covariates were used to estimate hazard ratios (HRs) and 95% confidence intervals (CIs) of dementia in relation to different job strain levels. Results An interaction between job demand and sleep disturbance regarding the risk of dementia was detected. Data suggested a protective role of high-level job demand for dementia in individuals with sleep disturbance (HR [95% CI]: 0.69 [0.47, 1.00]) compared with low job demand. A 4-category job strain model based on the combination of job demand and job control levels suggested that among individuals with sleep disturbance, passive job (low demand, low control) was associated with a higher risk of dementia (1.54 [1.01, 2.34]), compared to active job (high demand, high control). Conclusion The link between work-related stress and risk of dementia is limited to individuals suffering sleep disturbance. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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4. Mapping of European activities on the integration of sex and gender factors in neurology and neuroscience.
- Author
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Hentzen, Nina B., Ferretti, Maria Teresa, Santuccione Chadha, Antonella, Jaarsma, Joke, De Visser, Marianne, Moro, Elena, Aamodt, Anne Hege, Arabia, Gennarina, Aybeck, Selma, Carvalho, Vanessa, Goudier, Riadh, Grisold, Wolfgang, Lebedeva, Elena R., Matczack, Magda, Magyari, Melinda, Molnar, Maria Judit, Rakusa, Martin, Pajediene, Evelina, Tracy, Irene, and Vonck, Kristl
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GENDER ,EUROPEAN integration ,NEUROSCIENCES ,BIBLIOGRAPHIC databases ,NEUROLOGY ,QUANTITATIVE research - Abstract
Background and purpose: Neurological disorders pose a profound unmet medical need for which new solutions are urgently needed. The consideration of both biological (sex) and socio‐cultural (gender) differences between men and women is necessary to identify more efficacious, safer and tailored treatments. Approaches for putting sex and gender medicine into practice have gathered momentum across Europe, but it is currently unclear to what extent they have been implemented in the field of neurology and neuroscience. Methods: We mapped current activities in research, funding and education aimed at integrating sex and gender consideration in neuroscience and neurology in Europe. We examined and analyzed data gathered from literature searches, policy documents and reports by the European Commission and national funding agencies, web‐based searches, Web of Science, and searches of project databases of funding agencies. An informative/non‐systematic search was performed for sections on policies and funding, education, and basic research, while a systematic literature and database review was conducted for quantitative analysis of research output and funded projects in terms of sex and gender analysis. Results: Our mapping shows that there is a growing interest in and attention given to sex and gender considerations in neurological fields, both from funding agencies and researchers. However, most activities, especially for education, are limited to the individual motivation of researchers and are not organically built within curricula and strategic research priorities. Conclusion: We recommend actions that might help increase the consideration of sex and gender specifically in the field of neuroscience and neurology. [ABSTRACT FROM AUTHOR]
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- 2022
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5. Electronic cigarette use among adolescents in 17 European study sites: findings from the Global Youth Tobacco Survey.
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Tarasenko, Yelena, Ciobanu, Angela, Fayokun, Ranti, Lebedeva, Elizaveta, Commar, Alison, and Mauer-Stender, Kristina
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ELECTRONIC cigarettes ,CROSS-sectional method - Abstract
Background As new findings on public health implications of electronic cigarette (e-cigarette) use emerge, its surveillance remains of utmost importance. This study examined the latest state of e-cigarette use in youth in 17 European study sites (i.e. 16 countries and the Federation of Bosnia and Herzegovina) using the Global Youth Tobacco Survey (GYTS). Methods This was an observational study. Cross-sectional data on students aged 11–17 years from the latest available GYTS round completed in 17 study sites were used to estimate crude and adjusted prevalence of e-cigarette use by sex and pocket money. Panel GYTS data from five countries were used for the trend analyses. All analyses were weighted to account for the survey design and non-response. Results Compared to 2014, the age-adjusted prevalence of e-cigarette use more than doubled in Georgia and Italy, and nearly doubled in Latvia. Significantly more male than female students aged 11–17 years reported use of e-cigarettes, with little to no confounding by age, grade and pocket money across countries. Youth with medium or higher amount of pocket money was 20–200% more likely to use e-cigarettes than those with fewer to no pocket money in 14 study sites. Discussion As e-cigarette use is becoming widespread throughout the world, there is variation in use among and between countries. Expanded and consistent surveillance of e-cigarette use by all World Health Organization member states is essential to generate data on the extent and correlates of youth e-cigarette use for evidence-based planning and evaluation of the electronic nicotine delivery systems and electronic non-nicotine delivery systems national and global control programmes. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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6. Population dynamics of glochidia of the freshwater pearl mussel Margaritifera margaritifera L., parasitizing on juvenile Salmonidae fishes in northern water reservoirs.
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Ieshko, E. P., Larson, B. M., Pavlov, U. L., Barskaya, U. U., Lebedeva, D. I., and Novohatskaya, O. V.
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MARGARITIFERA margaritifera ,MUSSELS ,SALMON ,BINOMIAL distribution - Abstract
This paper presents data on the population dynamics of glochidia of the freshwater pearl mussel Margaritifera margaritifera L. (1758) (a declining species of European fauna), parasitizing on juvenile Salmonidae fishes in rivers of northern Europe. It was found that the number of glochidia parasitizing on gills of juvenile salmon and trout in explored water reservoirs are stimulated by negative binomial distribution. Estimation of the distribution parameter allows us to obtain statistically valid data on the population number of pearl mussel and to judge the stable character of interactions in the host-parasite system (balance of host specimens that are resistant and nonresistant to infection). [ABSTRACT FROM AUTHOR]
- Published
- 2009
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7. Sources of alimentation and variability of their contribution to river runoff formation in European Russia.
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Alekseevskii, N., Lebedeva, M., and Sokolovskii, D.
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NUTRITION ,RUNOFF ,HYDROLOGIC cycle ,WATER ,TAIGAS ,FORESTS & forestry ,NATURAL resources - Abstract
The genetic conditions of water runoff formation are studied for rivers in European Russia, whose basins are located in the zones of taiga, mixed forests, forest-steppe and steppe, and semi-deserts and deserts, as well as in the Northern Caucasus foothills. The genetic roles of rain, snowmelt, and subsurface waters are determined from results of the runoff hydrograph analysis based on the method developed by B. I. Kudelin. The effects of river dimensions, water abundance of the year, and local factors (the relative areas of forests and lakes and the elevation of watersheds) on the contribution of various sources of river alimentation to the formation of river water runoff are evaluated. [ABSTRACT FROM AUTHOR]
- Published
- 2007
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8. The Role of Higher Education in World Politics.
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Lebedeva, Marina
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HIGHER education , *INTERNATIONAL relations , *SCHOOL integration - Abstract
Higher education is considered as a global issue in world politics. Integration of education space in Europe (Bologna process) and its political impact (differentiating of regions, forming a common European elite, etc.) is discussed. Integration in Europe will give rise to similar processes in other countries and regions, inter alia in the USA, which puts forward a problem of adjusting the Bologna system with other educational standards. The paper is showing that Bologna process will stimulate the integration of the higher education field in other regions. Additionally WTO is covering education as a set of services. So, the problem is to adjust different standards (national, regional, IGO etc.) in the field of higher education. ..PAT.-Unpublished Manuscript [ABSTRACT FROM AUTHOR]
- Published
- 2007
9. Petrology of lamprophyre dykes in the Kola Alkaline Carbonatite Province (N Europe).
- Author
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Nosova, A.A., Kopylova, M.G., Sazonova, L.V., Vozniak, A.A., Kargin, A.V., Lebedeva, N.M., Volkova, G.D., and Peresetskaya, E.V.
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LAMPROPHYRES , *PETROLOGY , *DIKES (Geology) , *PHONOLITE , *CARBONATITES , *CARBON dioxide - Abstract
The study reports petrography, bulk major and trace element compositions of lamprophyric Devonian dykes in three areas of the Kola Alkaline Carbonatite Province (N Europe). Dykes in one of these areas, Kandalaksha, are not associated with a massif, while dykes in Kandaguba and Turij Mys occur adjacent (< 5 km) to coeval central multiphase ultramafic alkaline‑carbonatitic massifs. Kandalaksha dyke series consists of aillikites - phlogopite carbonatites and monchiquites. Kandaguba dykes range from monchiquites to nephelinites and phonolites; Turij Mys dykes represent alnöites, monchiquites, foidites, turjaites and carbonatites. Some dykes show extreme mineralogical and textural heterogeneity and layering we ascribe to fluid separation and crystal cumulation. Melt evolution of the dykes was modelled with Rhyolite-MELTS and compared with the observed order and products of the crystallization. Our results suggest that the studied rocks were related by fractional crystallization and liquid immiscibility. Primitive melts of aillikites or olivine melanephelinites initially evolved at P = 1.5–0.8 GPa without a SiO 2 increase due to abundant clinopyroxene crystallization controlled by the CO 2 -rich fluid. At 1–1.1 GPa the Turij Mys melts separated immiscible carbonatite melt, which subsequently exsolved late carbonate-rich fluids extremely rich in trace elements. Kandaguba and Turij Mys melts continued to fractionate at lower pressures in the presence of hydrous fluid to the more evolved nephelinite and phonolite melts. The studied dykes highlight the critical role of the parent magma chamber in crystal fractionation and magma diversification. The Kandalaksha dykes may represent a carbonatite – ultramafic lamprophyre association, which fractionated at 45–20 km in narrow dykes on ascent to the surface and could not get more evolved than monchiquite. In contrast, connections of Kandaguba and Turij Mys dykes to their massif magma chambers ensured the sufficient time for fractionation, ascent and a polybaric evolution. This longevity generated more evolved rock types with the higher alkalinity and an immiscible separation of carbonatites. [Display omitted] • Lamprophyric and carbonatitic dykes in three areas of Kola Province were studied. • Kandalaksha dykes not associated with a massif fractionated at high P of > 0.8 GPa. • Kandaguba and Turij Mys dykes relate to ultramafic alkaline-carbonatitic massifs. • Connections of massif magma chambers to dykes ensured their polybaric evolution. • The evolution led to evolved rocks with higher alkalinity and immiscible carbonatites. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
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