667 research outputs found

    Drug Plant Seed Viability Preservation by Cryoconservation

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    The article considers the possibility of cryopreservation of seeds of several species of drug plants in Central Kazakhstan – Tanacetum ulutavicum, Niedzwedzkia semiretschenskia, Rhaponticum carthamoides. To increase the amount of viable seeds after liquid nitrogen freezing, we used different defrosting temperatures, deposited seeds with different moisture contents and used different containers for cryopreservation. Recommendations, concerning conditions of cryopreservation of seeds of these drug plant species were developed, basing on the obtained results


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    The article presents the analysis of the results of sociological studies of the patients admitted to cardiac unit for patients with myocardial infarction and to the Department of medical rehabilitation for such patients. We studied the influence of ethical aspects of conduct of the medical staff, and household conditions in the offices on the level of patients' satisfaction with quality of medical care.Представлен анализ результатов социологического исследования пациентов, госпитализированных в кардиологическое отделение для больных инфарктом миокарда и в отделение медицинской реабилитации для таких больных. Изучено влияние деонтологических аспектов поведения медицинского персонала и бытовых условий пребывания в отделениях на уровень удовлетворенности пациентов качеством медицинской помощи

    Pore timing:the evolutionary origins of the nucleus and nuclear pore complex

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    The name “eukaryote” is derived from Greek, meaning “true kernel”, and describes the domain of organisms whose cells have a nucleus. The nucleus is thus the defining feature of eukaryotes and distinguishes them from prokaryotes (Archaea and Bacteria), whose cells lack nuclei. Despite this, we discuss the intriguing possibility that organisms on the path from the first eukaryotic common ancestor to the last common ancestor of all eukaryotes did not possess a nucleus at all—at least not in a form we would recognize today—and that the nucleus in fact arrived relatively late in the evolution of eukaryotes. The clues to this alternative evolutionary path lie, most of all, in recent discoveries concerning the structure of the nuclear pore complex. We discuss the evidence for such a possibility and how this impacts our views of eukaryote origins and how eukaryotes have diversified subsequent to their last common ancestor

    Measurement of the top quark mass using events with a single reconstructed top quark in pp collisions at s\sqrt{s} = 13 TeV

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    A measurement of the top quark mass is performed using a data sample enriched with single top quark events produced in the t channel. The study is based on proton- proton collision data, corresponding to an integrated luminosity of 35.9 fb1^{-1}, recorded at s\sqrt{s} = 13 TeV by the CMS experiment at the LHC in 2016. Candidate events are selected by requiring an isolated high-momentum lepton (muon or electron) and exactly two jets, of which one is identified as originating from a bottom quark. Multivariate discriminants are designed to separate the signal from the background. Optimized thresholds are placed on the discriminant outputs to obtain an event sample with high signal purity. The top quark mass is found to be 172.13+0.76^{+0.76}0.77_{-0.77} GeV, where the uncertainty includes both the statistical and systematic components, reaching sub-GeV precision for the first time in this event topology. The masses of the top quark and antiquark are also determined separately using the lepton charge in the final state, from which the mass ratio and difference are determined to be 0.9952+0.0079^{+0.0079}0.0104_{-0.0104} and 0.83+1.79^{+1.79}1.35_{-1.35} GeV, respectively. The results are consistent with CPT invariance

    Search for invisible decays of the Higgs boson produced via vector boson fusion in proton-proton collisions at s\sqrt{s} = 13 TeV