727 research outputs found
Free amino acids of the blood and some organs in hypokinesia
The metabolic fund of amino acids of the blood and tissues of rats under hypokinesia was investigated. The content of free amino acids was determined for the liver, kidney, brain, and the skeletal and cardiac muscles after established periods of hypokinesia. It was found that the total content of free amino acids in the experimental animals was, on the average 19 percent lower than in the controls. The results of the quantity of individual compounds indicate that the level of some were reduced while others were increased. It was also found that there was an unequal content of individual amino acids in the different tissues
Правове регулювання господарської діяльності в Україні
The textbook discusses the concept, legal status of business entities, the order of their formation and operation, lending, legal regulation of leasing and renting, exchange activities. After each topic, tests, practical tasks and topics for abstracts are provided. For students, graduate students and teachers of economics, philology and technical specialties.У навчальному посібнику розглядається поняття, правовий статус суб’єктів підприємницької діяльності, порядок їх утворення та діяльності, кредитування, правове регулювання лізингу та оренди, біржова діяльність. Після кожної теми надаються тести, практичні завдання та теми для рефератів. Для студентів, аспірантів та викладачів економічних, філологічних та технічних спеціальностей
Postural balance strategies for experienced rhythmic gymnasts in two-legged stands
Objective: The purpose of this study was to find out the indicators of the distribution of plantar pressure in the two-legged stands with open and closed eyes in experienced rhythmic gymnasts.Materials and methods: 31 highly qualified gymnasts (candidates and masters of sports of Russia), age 18.5 ± 0.5 years, experience in rhythmic gymnastics 13.5 ± 1.5, performed three upright postures on the footscan ® podometric platform of RSscan: the main stand, a modified Romberg test with open and closed eyes. Postural control was assessed by quantifying the plantar pressure (P%) in relation to 4 zones of the right and left foot and the trajectory of the movement of the center of pressure (CP) over time intervals.Results: The results of the study showed the presence of a right-sided distribution of plantar pressure in two-legged stands in experienced gymnasts. The regulation of posture occurs mainly in the anterior-posterior direction, but has different strategies for managing balance. The sagittal-cross pattern determines the interaction of plantar pressure between the right and left feet in the basic pose. The Romberg test with open eyes (EO) and closed eyes (EC) characterizes sagittal-parallel and sagittal-asymmetric balance, respectively. We revealed an increase in the vibrations of the gymnast's body in the absence of visual information for only the first 12 seconds.Conclusions: We have identified a variety of combinations of two types of strategies while maintaining posture in simple poses. This indicates the ability of experienced gymnasts to fine-tune the postural stability, including in the absence of visual information
Stochastic effects at ripple formation processes in anisotropic systems with multiplicative noise
We study pattern formation processes in anisotropic system governed by the
Kuramoto-Sivashinsky equation with multiplicative noise as a generalization of
the Bradley-Harper model for ripple formation induced by ion bombardment. For
both linear and nonlinear systems we study noise induced effects at ripple
formation and discuss scaling behavior of the surface growth and roughness
characteristics. It was found that the secondary parameters of the ion beam
(beam profile and variations of an incidence angle) can crucially change the
topology of patterns and the corresponding dynamics
The Konus-Wind catalog of gamma-ray bursts with known redshifts. II. Waiting mode bursts simultaneously detected by Swift/BAT
In the Second part of The Konus-Wind Catalog of Gamma-Ray Bursts with Known
Redshifts (first part: Tsvetkova et al. 2017; T17), we present the results of a
systematic study of gamma-ray bursts (GRBs) with reliable redshift estimates
detected simultaneously by the Konus-Wind (KW) experiment (in the waiting mode)
and by the Swift/BAT (BAT) telescope during the period from 2005 January to the
end of 2018. By taking advantage of the high sensitivity of BAT and the wide
spectral band of KW we were able to constrain the peak spectral energies, the
broadband energy fluences, and the peak fluxes for the joint KW-BAT sample of
167 weak, relatively soft GRBs (including four short bursts). Based on the GRB
redshifts, which span the range , we estimate the
rest-frame, isotropic-equivalent energy, and peak luminosity. For 14 GRBs with
reasonably constrained jet breaks, we provide the collimation-corrected values
of the energetics. This work extends the sample of KW GRBs with known redshifts
to 338 GRBs, the largest set of cosmological GRBs studied to date over a broad
energy band. With the full KW sample, accounting for the instrumental bias, we
explore GRB rest-frame properties, including hardness-intensity correlations,
GRB luminosity evolution, luminosity and isotropic-energy functions, and the
evolution of the GRB formation rate, which we find to be in general agreement
with those reported in T17 and other previous studies.Comment: Accepted for publication in ApJ; 41 pages, 5 figures, 7 tables.
References in Table 5 fixed compared with the initial submission. See also
arXiv:1710.08746 for Part I of the Catalo
Ecological traits affect the sensitivity of bees to land-use pressures in European agricultural landscapes
1. Bees are a functionally important and economically valuable group, but are threatened byland-use conversion and intensification. Such pressures are not expected to affect all species identically; rather, they are likely to be mediated by the species’ ecological traits. 2. Understanding which types of species are most vulnerable under which land uses is an important step towards effective conservation planning.3. We collated occurrence and abundance data for 257 bee species at 1584 European sites from surveys reported in 30 published papers (70 056 records) and combined them with species-level ecological trait data. We used mixed-effects models to assess the importance of land use (land-use class, agricultural use-intensity and a remotely-sensed measure of vegetation),traits and trait 9 land-use interactions, in explaining species occurrence and abundance.4. Species’ sensitivity to land use was most strongly influenced by flight season duration and foraging range, but also by niche breadth, reproductive strategy and phenology, with effects that differed among cropland, pastoral and urban habitats.5. Synthesis and applications. Rather than targeting particular species or settings, conservation action s may be more effective if focused on mitigating situations where species’ traits strongly and negatively interact with land-use pressures. We find evidence that low-intensity agriculture can maintain relatively diverse bee communities; in more intensive settings, added floral resources may be beneficial, but will require careful placement with respect to foraging ranges of smaller bee species. Protection of semi-natural habitats is essential, however; in particular, conversion to urban environments could have severe effects on bee diversity and pollination services. Our results highlight the importance of exploring how ecological traits mediate species responses to human impacts, but further research is needed to enhance the predictive ability of such analyses
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