745 research outputs found
До проблеми вивчення весілля Шевченкового краю (за матеріалами передвесільної обрядовості)
While businesses may attract potential offenders and thus be conducive to
disorder, the number of employees could offset this by exercising social
control on offenders. This study uses data from different sources to test
this expectation across 278 Dutch neighborhoods in the four largest cities
of the Netherlands, using multivariate multilevel analysis to disentangle
individual perception differences of disorder and neighborhood effects.
Attention is paid to traditional explanations of disorder (i.e., poverty, residential
mobility, and ethnic heterogeneity). Results show a positive relationship
between business presence and neighborhood disorder. We do not find
consistent results of the number of employees (i.e., bigger businesses are
not always better or worse). Our research demonstrates that the presence of neighborhood businesses could rival the effects of social disorganization
theory
Хвороби колосу у озимої пшениці лісостепу України
Наводяться результати вивчення видового складу збудників хвороб колосу і зерна озимої пшениці. В результаті мікологічного аналізу визначили, що мікофлора хворого колосся представлена такими видами грибів: Mucor mucedo, Penicilium viridicatum, P. expansum, Alternaria alternata, A. tenussima, Cladosporium herbarum, Fusarium sporotrichiella, F.oxysporum, F. moniliforme, F. culmorum, F. graminearum, F. gibbosum. Серед грибів роду Fusarium найбільш поширеним є F. graminearum. До даного захворювання виділені відносно стійкі сорти: Деметра, Ростиславна, Багіра, Сніжана.Приводятся результаты изучения видового состава возбудителей болезней колоса и семян озимой пшеницы. В результате микологического анализа определили, что микофлора больных колосьев представлена такими видами грибов: Mucor mucedo, Penicillium viridicatum, P. expansum, Alternaria alternata, A. tenussima, Cladosporium herbarum, Fusarium sporotrichiella, F. oxysporum, F. moniliforme, F culmorum, F. graminearum, F. gibbosum. Среди грибов рода Fusarium наиболее распространенным является F. graminearum. К даному заболеванию выделены относительно устойчивые сорта: Деметра, Ростиславна, Багира, Снижана.Results of studying specific composition of pathogens of winter wheat head and seeds are given. Resulted from mycological analyze it was determined that mycoflora of attacked ears consists of such fungi species as Mucor mucedo, Penicillium viridicatum, P. expansum, Alternaria alternata, A. tenussima, Cladosporium herbarum, Fusarium sporotrichiella, F. oxysporum, F. moniliforme, F. culmorum, F. graminearum, F. gibbosum. F. graminerum was the most widespread species among Fusarium genus. Comparatively resistant against these disease cultivars Demetra, Rostyslavna, Bagira, Snizhana were singled out
Local Surface Density of the Galactic Disk from a 3-D Stellar Velocity Sample
We have re-estimated the surface density of the Galactic disk in the solar
neighborhood within 0.4 kpc of the Sun using parallaxes and proper
motions of a kinematically and spatially unbiased sample of 1476 old bright red
giant stars from the Hipparcos catalog with measured radial velocities from
Barbier-Brossat & Figon (2000). We determine the vertical distribution of the
red giants as well as the vertical velocity dispersion of the sample, (14.4
0.26 km/sec), and combine these to derive the surface density of
gravitating matter in the Galactic disk as a function of the galactic
coordinate . The surface density of the disk increases from 10.5 0.5
/ pc within 50 pc to 42 6 / pc
within 350 pc. The estimated volume density of the galactic disk within
50 pc is about 0.1 / pc which is close to the volume
density estimates of the observed baryonic matter in the solar neighborhood.Comment: 24 pages, 15 figures, AJ in pres
Are Compact High-Velocity Clouds Extragalactic Objects?
Compact high-velocity clouds (CHVCs) are the most distant of the HVCs in the
Local Group model and would have HI volume densities of order 0.0003/cm^3.
Clouds with these volume densities and the observed neutral hydrogen column
densities will be largely ionized, even if exposed only to the extragalactic
ionizing radiation field. Here we examine the implications of this process for
models of CHVCs. We have modeled the ionization structure of spherical clouds
(with and without dark matter halos) for a large range of densities and sizes,
appropriate to CHVCs over the range of suggested distances, exposed to the
extragalactic ionizing photon flux. Constant-density cloud models in which the
CHVCs are at Local Group distances have total (ionized plus neutral) gas masses
roughly 20-30 times larger than the neutral gas masses, implying that the gas
mass alone of the observed population of CHVCs is about 40 billion solar
masses. With a realistic (10:1) dark matter to gas mass ratio, the total mass
in such CHVCs is a significant fraction of the dynamical mass of the Local
Group, and their line widths would exceed the observed FWHM. Models with dark
matter halos fare even more poorly; they must lie within approximately 200 kpc
of the Galaxy. We show that exponential neutral hydrogen column density
profiles are a natural consequence of an external source of ionizing photons,
and argue that these profiles cannot be used to derive model-independent
distances to the CHVCs. These results argue strongly that the CHVCs are not
cosmological objects, and are instead associated with the Galactic halo.Comment: 30 pages, 14 figures; to appear in The Astrophysical Journa
Functional Polycentrism and Urban Network Development in the Greater South East UK: Evidence from Commuting Patterns, 1981-2001
In contemporary literature on changing urban systems, it is often argued that the traditional central place conceptualisation is outdated and should be replaced by a network view that emphasises the increasing criss-crossing pattern of interdependencies between spatial units. This paper tests for urban network development by looking at commuting patterns in the Greater South East UK. The analysis is based on census commuting interaction data for three points in time during the past three decades (1981, 1991, and 2001). Although the empirical results indicate that the Greater South East UK can still not be characterized as a polycentric urban region or integrated urban network, there is some evidence for urban network development at the local, intra-urban, level as well as a decentralization of the system at the regional, inter-urban, level
Childhood Characteristics of Adolescent Inpatients with Early-Onset and Adolescent-Onset Disruptive Behavior
Childhood characteristics are associated with life-course-persistent antisocial behavior in epidemiological studies in general population samples. The present study examines this association in an inpatient sample. The purpose is to identify easily measurable childhood characteristics that may guide choice of treatment for adolescent psychiatric inpatients with severe disruptive behavior. Patients (N = 203) were divided into two groups with either early-onset (EO) or adolescent-onset (AO) disruptive behavior, based on ages at which professional care was used for disruptive behavior, referral to special education, and criminal offences. Both groups differed on several childhood characteristics. No gender differences in these characteristics were found. Logistic regression analysis indicated that individuals with grade retention in primary school, childhood impulsive behavior, and a history of physical abuse, had the highest probability of being member of the EO group. These characteristics are reasonably easy to identify, likely apply to other clinical samples as well, and may help clinicians to target their treatment
The physics of water and wax in the pores of a working Gas-to-Liquids catalyst
The so-called Fischer-Tropsch catalysis allows to convert natural gas into liquid products and is the underlying mechanism of commercially used "Gas-to-Liquids" plants. The actual reaction takes place in millimetre sized porous pellets in which active metallic particles are dispersed as catalysts. Due to the reaction the pores of the pellets will become filled with the reaction products ("wax" and water), but it is uncertain if the fluid in the pores can be understood as a single liquid phase, a liquid-gas mixture, or multiple continuous phases. The answer to this question is important for a thorough understanding of the transport processes inside the reactor and can be utilized to improve its eciency. In this project, a theoretical analysis of the behaviour inside the pores is performed. It is concluded that a liquid water phase might well exist next to the wax phase. However, the analysis is based on very limited experimental data of unknown quality. Therefore, we propose a number of possible experiments to validate the theoretical concepts
Thermal unfolding and refolding of a lytic polysaccharide monooxygenase from <em>Thermoascus</em> aurantiacus
Lytic polysaccharide monooxygenases (LPMOs) are copper-containing enzymes which promote the degradation of recalcitrant polysaccharides like cellulose or chitin. Here, we have investigated the thermostability of an LPMO from Thermoascus aurantiacus (TaLPMO9A). TaLPMO9A was found to retain most of its initial activity after incubating at 100 °C while its apparent melting temperature (Tm) is 69 °C at neutral pH. Interestingly, our studies show that holoTaLPMO9A, apoTaLPMO9A and deglycosylated TaLPMO9A can fold back to their original conformation upon lowering the temperature. In the presence of β-mercaptoethanol the protein does not refold. Activity of TaLPMO9A and refolded TaLPMO9A was studied by an Amplex® Red assay as well as by TaLPMO9A catalysed oxidation of phosphoric acid swollen cellulose (PASC). These studies confirm the functional regain of TaLPMO9A activity upon going through one cycle of unfolding and refolding. The thermal unfolding and refolding of TaLPMO9A was measured spectroscopically. Utilizing the two-state model, detailed thermodynamic parameters were obtained for holoTaLPMO. Furthermore, we have investigated the kinetics of TaLPMO9A unfolding and refolding. Our results have implications in understanding LPMO stability, which is crucial for the efficient application of LPMOs as biocatalysts during biomass degradation
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