97 research outputs found

    СРАВНИТЕЛЬНАЯ ОЦЕНКА ИСПОЛЬЗОВАНИЯ ЗРЕЛЫХ И НЕЗРЕЛЫХ ЗАРОДЫШЕЙ ЯРОВОЙ ТВЕРДОЙ ПШЕНИЦЫ В КУЛЬТУРЕ IN VITRO

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    Исследованы процессы индукции каллусогенеза различных генотипов яровой твердой пшеницы. Установлена генотипическая зависимость частоты морфогенеза. Показано, что эффективность процесса и тип каллуса обусловлены выбранным эксплантом. Установлено, что наибольшим морфогенетическим потенциалом обладают каллусы из незрелых зародышей. У морфогенетических линий, полученных из зрелых зародышей, процесс органогенеза не достигает организменного уровня, а заканчивается образованием корней (ризогенезом)

    CHANGES OF PRODUCTIVITY AND QUALITY PARAMETERS OF SPRING DURUM WHEAT KHARKOVSKAYA 46 UNDER INFLUENCE OF ECOLOGICAL FACTORS

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    In the article the data of comparative studies of ‘Kharkovskaya 46’ecological variants which have been cultivated for a long time in Ukraine and in Altai, as well as ‘Altaika’ selected from this variety are presented. The effect of natural selection in the variety transformation at the long term cultivation under definite natural and climatic environments was demonstrated

    Yield performance and stability of modern breeding stock of spring durum wheat (Triticum durum Desf.) from Russia and Kazakhstan

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    Identifcation of adaptive responses of breeding material, developed in different breeding centers, helps to purposefully correct these traits where it is necessary. Thus, 42 modern breeding lines from eight institutions of Russia and Kazakhstan were studied in comparison with the historical standard Bezenchukskaya 139 in trails of 16-17 and 18 KASIB-SDW (Kazakhstan-Siberian net for wheat improvement, spring durum wheat) in 2015–2017. Field experiments and yield measurements in each ecological cite were similar. To solve these tasks of the experiment, two-factor ANOVA, methods for adaptability assessment cluster analysis and principle component method were applied. As a result, it was established that 1) genotype and genotype – environment interaction (overall 15.8–23.5 % of total dispersion) had signifcant effect on yield variability; 2) genotype – environment interactions were of linear nature and had no destabilizing effect; 3) all the genotypes tested can be distributed in three clusters, the frst one for locally adapted varieties, the third for varieties of a wide areal, the second included genotypes with intermediate characteristics; 4) breeding centers of the Federal Altai Scientifc Centre of Agro-Biotechnologies and of the Research Institute of Agriculture of South-East produced predominantly varieties of local importance, the Samara Research Institute of Agriculture – varieties of wide area; 5) a stable trend of increased mean yield compared to historical standard Bezenchukskaya 139 over ecological sites was observed only for Samara varieties; 6) varieties of all the breeding centers had no stable difference from Bezenchukskaya 139 concerning stability and responsiveness, which can be explained by an incomplete breeding process for these parameters and confrms the importance of the KASIB program; 7) a trend of yield increase compared to Bezenchukskaya 139 under testing in defnite local environments had more stable parameters with the largest progress observed in the Altai Research Institute of Agriculture (135.4 and 163.2 % to Bezenchukskaya 139), which can be explained by a high efciency of breeding of locally adapted varieties in the breeding center

    Age changes of blood microcirculation in students and sportsmen under the influence of physical training

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    Age specifi c features of blood microcircula詛 on reac誛 vity in students and athletes (freestyle wrestling at the level of candidates for a master of sports) are studied for 18 to 21 years under the infl uence of a dosed physical training. Signifi cant diff erences in the values of the most parameters characterizing the microcircula萋 on of blood at rest were observed between the 4 age groups under examina裻 on, both in students and athletes with diff erent levels of the microcircula萋 on index, and it was shown that the contribu詻 on of ac詻 ve modula脫 ons of the blood fl ow to the forma裻 on of its profi le is more important. Regular exercise changes the age dependence of the level of muscle 詻 ssue perfusion, as well as the amplitude of blood fl ow fl uctua詻 ons in 裻 ssues. Essen裻 al diff erences in the eff ect of physical training on the eff ec譋 veness of microcircula譋 on in stu- dents and athletes have been established, depending on the value of the microcircula誛 on index. The results indicate the need to take into account the hierarchy of regulatory mechanisms in the selec荫 on of the intensity of physical training, as well as the possibility of a targeted eff ect on respiratory-pulse modula講 on in the microvasculature and, consequently, on their ra譛 o, by means of dosed physical training

    Search for sterile neutrinos at the DANSS experiment

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    DANSS is a highly segmented 1~m3{}^3 plastic scintillator detector. Its 2500 one meter long scintillator strips have a Gd-loaded reflective cover. The DANSS detector is placed under an industrial 3.1~GWth\mathrm{GW_{th}} reactor of the Kalinin Nuclear Power Plant 350~km NW from Moscow. The distance to the core is varied on-line from 10.7~m to 12.7~m. The reactor building provides about 50~m water-equivalent shielding against the cosmic background. DANSS detects almost 5000 ν~e\widetilde\nu_e per day at the closest position with the cosmic background less than 3%\%. The inverse beta decay process is used to detect ν~e\widetilde\nu_e. Sterile neutrinos are searched for assuming the 4ν4\nu model (3 active and 1 sterile ν\nu). The exclusion area in the Δm142,sin22θ14\Delta m_{14}^2,\sin^22\theta_{14} plane is obtained using a ratio of positron energy spectra collected at different distances. Therefore results do not depend on the shape and normalization of the reactor ν~e\widetilde\nu_e spectrum, as well as on the detector efficiency. Results are based on 966 thousand antineutrino events collected at 3 distances from the reactor core. The excluded area covers a wide range of the sterile neutrino parameters up to sin22θ14<0.01\sin^22\theta_{14}<0.01 in the most sensitive region.Comment: 10 pages, 13 figures, version accepted for publicatio

    Университет Гумбольдта в контексте современных научных и образовательных коммуникаций

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    The article analyzes problems of the classical Humboldt University in a context of modern scientific and educational technologies; emphasizes the University significance for the whole international system of university education. Among the multitude tasks historically solved by the university, the authors pay special attention to problems of the classical disciplinarity of university education, and the personal and state identity formation. At the same time, disciplinary issues are analyzed in their classical and nonclassical forms. In particular, the new disciplinarity features are considered. Likewise, identity problems are explored in different contexts as well. Various forms of presenting these problems are revealed, including reconstructing ways of identity formation, which contains contexts of self-education, general contexts of culture, urban identity formation. The article highlights the role of narrative and narrative identity in forming personal and cultural identity, and transmitting socio-cultural meanings and values. It reveals the changeable temporal nature of identity. It is shown that language is associated with structuring a person»s narrative identity. Following J. Lyotard, the authors show that narrative knowledge is built within its language game frameworks; demonstrate the role of alienation and cognitive appropriation in the narrative creation processes. The paper consistently suggests that modern conceptual apparatus of identity and disciplinarity problems can be applied to analyze relevant issues both in modern conditions, and in the history of education and culture. Moreover, this method of analysis leads, in turn, to enrichment of the used conceptual apparatus itself. The research methodology is based on such concepts as methodology of text expert analysis, text informal analytics, discourse analysis, conceptual analysis.В статье проблемы классического университета Гумбольдта анализируются в контексте современных научных и образовательных технологий, подчеркивается значение данного университета для всей международной системы университетского образования. Среди множества задач и проблем, которые исторически решал этот университет, в статье особое внимание уделяется проблемам классической дисциплинарности университетского образования и проблемам формирования личностной и государственной идентичности. В то же время вопросы дисциплинарности анализируются в их классической и неклассической формах. В частности, рассматриваются особенности новой дисциплинарности. Точно так же в различных контекстах исследуются и проблемы идентичности. Раскрываются разные формы представления данных проблем, в том числе реконструируются некоторые способы формирования идентичности, включая контексты самообразования, общие контексты культуры, контексты формирования городской идентичности. В статье выделяется роль нарратива и нарративной идентичности в процессах формирования личностной и культурной идентичности и передачи социально-культурных смыслов и ценностей. Раскрывается изменчивый, темпоральный характер идентичности. Показывается, что язык связан со структурированием нарративной идентичности человека. Показывается, вслед за Ж. Лиотаром, что нарративное знание выстраивается в рамках своей языковой игры. Подчеркивается роль отчуждения и когнитивного присвоения в процессах создания нарратива. В статье последовательно проводится мысль о том, что современный развитый концептуальный аппарат проблем идентичности и дисциплинарности может быть применен для анализа соответствующих вопросов не только в современных условиях, но и в истории образования и культуры. Более того, такой способ анализа приводит, в свою очередь, к обогащению самого используемого концептуального аппарата. Методология исследования опирается на такие методологические концепции, как методология экспертного анализа текста (МЭАТ), неформальная аналитика текста (НАТ), дискурс-анализ, концептуальный анализ

    First demonstration of 30 eVee ionization energy resolution with Ricochet germanium cryogenic bolometers

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    The future Ricochet experiment aims to search for new physics in the electroweak sector by measuring the Coherent Elastic Neutrino-Nucleus Scattering process from reactor antineutrinos with high precision down to the sub-100 eV nuclear recoil energy range. While the Ricochet collaboration is currently building the experimental setup at the reactor site, it is also finalizing the cryogenic detector arrays that will be integrated into the cryostat at the Institut Laue Langevin in early 2024. In this paper, we report on recent progress from the Ge cryogenic detector technology, called the CryoCube. More specifically, we present the first demonstration of a 30~eVee (electron equivalent) baseline ionization resolution (RMS) achieved with an early design of the detector assembly and its dedicated High Electron Mobility Transistor (HEMT) based front-end electronics. This represents an order of magnitude improvement over the best ionization resolutions obtained on similar heat-and-ionization germanium cryogenic detectors from the EDELWEISS and SuperCDMS dark matter experiments, and a factor of three improvement compared to the first fully-cryogenic HEMT-based preamplifier coupled to a CDMS-II germanium detector. Additionally, we discuss the implications of these results in the context of the future Ricochet experiment and its expected background mitigation performance.Comment: 10 pages, 5 figures, 1 tabl

    Fast neutron background characterization of the future Ricochet experiment at the ILL research nuclear reactor

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    The future Ricochet experiment aims at searching for new physics in the electroweak sector by providing a high precision measurement of the Coherent Elastic Neutrino-Nucleus Scattering (CENNS) process down to the sub-100 eV nuclear recoil energy range. The experiment will deploy a kg-scale low-energy-threshold detector array combining Ge and Zn target crystals 8.8 meters away from the 58 MW research nuclear reactor core of the Institut Laue Langevin (ILL) in Grenoble, France. Currently, the Ricochet collaboration is characterizing the backgrounds at its future experimental site in order to optimize the experiment's shielding design. The most threatening background component, which cannot be actively rejected by particle identification, consists of keV-scale neutron-induced nuclear recoils. These initial fast neutrons are generated by the reactor core and surrounding experiments (reactogenics), and by the cosmic rays producing primary neutrons and muon-induced neutrons in the surrounding materials. In this paper, we present the Ricochet neutron background characterization using 3^3He proportional counters which exhibit a high sensitivity to thermal, epithermal and fast neutrons. We compare these measurements to the Ricochet Geant4 simulations to validate our reactogenic and cosmogenic neutron background estimations. Eventually, we present our estimated neutron background for the future Ricochet experiment and the resulting CENNS detection significance.Comment: 14 pages, 14 figures, 1 tabl
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