35 research outputs found

    Инженерно-геологическая характеристика долины реки Припять в пределах Республики Беларусь

    Get PDF
    The features of formation and spatial differentiation of engineering-geological conditions are considered. Genetic types of soil strata are identified as followed: alluvial, lake and marsh, water-glacial, moraine. Based on the analysis of physical and mechanical properties of soils, the assessment of their use as a basement for engineering structures was conducted. It is advised to use within the Pripyat River valley loamy, sandy and sandy sediments of different genesis as natural foundations for buildings the structures. It is noted that the widespread in this area marsh sediments are extremely undesirable to use as natural foundations.Рассмотрены особенности формирования и пространственной дифференциации инженерногеологических условий, выделены генетические типы грунтовых толщ: аллювиальные, озерные и болотные, водно-ледниковые, моренные. Проанализированы физико-механические свойства грунтов и дана оценка их использования как оснований инженерных сооружений. Определено, что в пределах речной долины Припяти целесообразно в качестве естественных оснований зданий и сооружений использовать суглинистые, супесчаные и песчаные отложения различного генезиса, а широко распространенные на изучаемой территории болотные отложения использовать в качестве естественных оснований крайне нежелательно

    Torsion free groups with indecomposable holonomy group I

    Get PDF
    We study the torsion free generalized crystallographic groups with the indecomposable holonomy group which is isomorphic to either a cyclic group of order ps{p^s} or a direct product of two cyclic groups of order p{p}.Comment: 22 pages, AMS-Te

    Pneumomediastinum as a predictor of negative prognosis in patients with coronavirus pneumonia

    Get PDF
    Aim of the study was to analyze the course of coronavirus pneumonia in patients with pneumomediastinum. Material and methods. The study included 139 patients, 71 of whom developed spontaneous pneumomediastinum against the background of coronavirus pneumonia. Laboratory, clinical and radiological data were analyzed and compared. Results. The relationship between the severity of viral pneumonia (3rd–4th degree of severity according to MSCT) and pneumomediastinum was revealed. It was found that spontaneous mediastinal emphysema in patients with COVID-19 signifcantly more often leads to the development of acute respiratory distress syndrome, multiple organ failure and can be a predictor of negative prognosis of the disease outcome. Conclusions. Pneumomediastinum in patients with viral pneumonia caused by a new coronavirus infection is a predictor of severe disease and poor prognosis. With an increase in spontaneous mediastinal emphysema without pneumothorax, it is recommended to perform mediastinotomy according to Razumovsky’s indications, and in case of clinically signifcant concomitant pneumothorax – drainage and revision of the mediastinum

    DISTRIBUTION OF BIOCHEMICAL AND MOLECULAR-GENETIC MARKERS OF GENES IN WORKERS OF COAL MINING ENTERPRISES OF KUZBASS REGION SUFFERING FROM CHRONIC DUST BRONCHITIS

    Get PDF
    Distribution of genotypes of biochemical markers of HP, GC, EsD, АсР genes, genotypes on polymorphic variants of the genes coding enzymes of biotransformation GSTT1 (GST-ɵ1) and GSTM1 (GST-μ1) and NOS3 (VNTR4 polymorphism) in the miners with chronic mechanic bronchitis, and in persons without this occupational pathology is investigated. It is shown that the owners of EsD 1-2, АсР bb genotypes are most subject to development of chronic mechanic bronchitis. Endogen factors of resistance to this disease are GC 1-1, EsD 1-1, АсР bc genotypes

    НОВЫЕ ГЕНЫ-КАНДИДАТЫ ПОДВЕРЖЕННОСТИ ТУБЕРКУЛЕЗУ, УСТАНОВЛЕННЫЕ С ПОМОЩЬЮ ПОСТРОЕНИЯ И АНАЛИЗА АССОЦИАТИВНЫХ СЕТЕЙ

    Get PDF
    Tuberculosis (TB) is a common disease caused by infection of Mycobacterium tuberculosis and influenced by host hereditary and environmental factors. Accumulated genomic data obtained through the use of new methodological approaches, including analysis of associative networks, contribute to the understanding of the hereditary basis of the disease. In the current study, we carried out the reconstruction and analysis of associative network representing molecular genetic links between proteins/genes involved in the development of TB. In the associative network, well studied proteins and genes with a decisive importance in the efficiency of the human immune response against a pathogen predominated. However, this approach identified 12 new genes encoding for the respective proteins in the associative network polymorphismsof which has not been studied regarding the development of TB.Туберкулез (ТБ) является распространенным заболеванием, развитие которого вызвано инфекцией Mycobacterium tuberculosis при модифицирующем влиянии наследственных и средовых факторов. Накопленные к настоящему времени геномные данные способствуют пониманию наследственных основ развития заболевания с использованием новых методологических подходов, в том числе анализа ассоциативных сетей. В настоящем исследовании выполнены реконструкция и анализ ассоциативной сети, представляющей собой молекулярно-генетические взаимосвязи между белками и генами, участвующими в развитии ТБ. Преимущественно в ассоциативной сети находятся хорошо изученные белки и гены, способные оказывать решающее значение в повышении эффективности иммунного ответа организ-ма человека против патогена. Однако, благодаря данному подходу, выявлено 12 новых генов, кодирующих соответствующие белки в ассоциативной сети, полиморфизм которых не изучен в связи с развитием ТБ

    Стресс-индуцированная дисфункция тромбоцитов у крыс с фолат-зависимой гипергомоцистеинемией

    Get PDF
    A rat model of experimental hyperhomocysteinemia (HHC) caused by chronic folic acid deficiency was used to study the impact of swimming stress on the values of agonist-induced platelet aggregation and ATP release. At week 8 of HHC development, platelet aggregability and ATP levels in response to test inductors (ADP, thrombin, and collagen) moderately increased. After stress, the rate of platelet aggregation showed a more increase in rats with HHC; however, the increment was less pronounced than in the control group. The similar changes was observed in ATP, the release of which from dense platelet granules decreased in the experimental animals exposed to stress changes as compared to the controls. The experimental findings suggest that the stress potentiates platelet dysfunction in HHC. На модели экспериментальной гипергомоцистеинемии (ГГЦ) у крыс, вызванной хроническим дефицитом в организме фолиевой кислоты, изучалось влияние плавательного стресса на показатели агонист-индуцированной агрегации тромбоцитов и реакцию высвобождения из них АТФ. Показано, что на восьмой неделе развития ГГЦ агре-гационная способность тромбоцитов, как и уровень АТФ на все исследованные индукторы (АДФ, тромбин, коллаген), умеренно повышались. После стрессовой нагрузки интенсивность агрегации тромбоцитов у крыс с ГГЦ еще более возрастала, однако прирост ее был менее выраженным, чем в контрольной группе. Аналогичная динамика зарегистрирована со стороны АТФ, выброс которого из плотных тромбоцитарных гранул опытных животных, подвергнутых стрессу, уменьшался по сравнению с контролем. Результаты экспериментов свидетельствуют о потенцирующем влиянии стресса на дисфункцию тромбоцитов при ГГЦ.

    Visualizing the Human Subcortex Using Ultra-high Field Magnetic Resonance Imaging

    Get PDF

    Stability of Baroclinic Vortices on the β Plane and Implications for Transport

    No full text
    Abstract This paper explores stability of and transport by baroclinic vortices on the β plane using a two-layer, quasigeostrophic model. The study adapts a wave–mean flow formalism and examines interactions between the axisymmetric flow (“the vortex”) and residuals (“the waves”). Unlike baroclinically unstable vortices on the f plane, such vortices on the β plane can be also vulnerable to barotropic instability as revealed by the globally integrated energy balance analysis. The spatial structure of energy fluxes shows the energy leakage inside the vortex core when its breakdown occurs. Mixing by stable and unstable vortical flows is quantified through the computation of finite-time Lyapunov exponent (FTLE) maps. Depending on the strength of wave radiation, the upper-layer FTLE maps of stable vortices show either an annulus or volute ring of vigorous mixing inside the vortex interior. This ring region is disrupted when the vortex becomes unstable. Both stable and unstable vortices show the wavy patterns of FTLE in the near and far fields. Despite the fact that the initial vortex resides in the top layer only, significant FTLE patterns are observed in the deep layer at later times. Lagrangian analysis of the vortex-induced change of large-scale tracer gradient demonstrates significant effects of vortex instability in the top layer and the importance of the wavelike anomalies in the bottom layer
    corecore