2,429 research outputs found
Changes in the ratio of plants with different mycorrhizal status in the course of pasture digression in the Southern Ural steppes
Trends in the proportions of plants differently interacting with mycorrhizal fungi in the course of pasture digression have been analyzed in the steppe zone of the Southern Urals. Estimates of species richness and abundance of plant groups with different mycorrhizal status have been obtained by comparing original data on the structure of phytocenoses with published data on the ability of plant species to form mycorrhizae. It has been shown that the proportions and abundance of obligate mycorrhizal species decrease significantly in the course of digression, with consequent increase in those of species less dependent on or independent of symbiosis with fungi, i.e., facultative mycorrhizal or obligate nonmycorrhizal plants. © 2013 Pleiades Publishing, Ltd
Symmetry adapted ro-vibrational basis functions for variational nuclear motion calculations: TROVE approach
We present a general, numerically motivated approach to the construction of
symmetry adapted basis functions for solving ro-vibrational Schr\"{o}dinger
equations. The approach is based on the property of the Hamiltonian operator to
commute with the complete set of symmetry operators and hence to reflect the
symmetry of the system. The symmetry adapted ro-vibrational basis set is
constructed numerically by solving a set of reduced vibrational eigenvalue
problems. In order to assign the irreducible representations associated with
these eigenfunctions, their symmetry properties are probed on a grid of
molecular geometries with the corresponding symmetry operations. The
transformation matrices are re-constructed by solving over-determined systems
of linear equations related to the transformation properties of the
corresponding wavefunctions on the grid. Our method is implemented in the
variational approach TROVE and has been successfully applied to a number of
problems covering the most important molecular symmetry groups. Several
examples are used to illustrate the procedure, which can be easily applied to
different types of coordinates, basis sets, and molecular systems
Rate of recovery of lichen-dominated tundra vegetation after overgrazing at the Yamal Peninsula ( Short Communication )
Lichens are the most sensitive part of vegetation cover to reindeer grazing. In this study we analyse success of restoration rate of lichen-rich tundra vegetation after ceasing the grazing stress at the Yamal Peninsula. On experimental plots we compare the main parameters of lichen mat (species diversity, total cover, thalii height, biomass, recovery rate) on grazed pastures and fanced sites after 13 years after of its isolation. Our results demonstrate that after intensive overgrazing the lichen species diversity and synusiases structure change very slowly. The rate of the biomass increase of lichens for this period has made 3.8 g m-2 year-1 that makes 3.6% from mass in the year. But this rate is two times lowers than in highly productive lichen communities
Low–fat high–protein fermented milk product with oat extract as a nature stabilizer
Nowadays, the use of plant components in terms of their pronounced functional
properties is of high relevance. Oat extract contains gums, β–glucans, vitamins (A, B1, B5, B9,
PP, H), minerals (Fe, I, K, Si, Mn, Cu, Mo, etc.) and essential amino acids. It has been proven
that a long–term use of β–glucans showed the reduction of the risk of cardiovascular disease and
diabetes and the regulation of cholesterol and blood sugar. β glucans also have immunoprotective,
anti–inflammatory, antimicrobial, prebiotic effects and improve intestinal motility. The aim of
study was to develop the technology of low–fat high–protein fermented milk product with
functional characteristics. Oat extract was used as a natural stabilizer and a source of β–glucans.
Maceration technique was used for the extraction. The recommended extraction parameters were
established and physicochemical characteristics of the extract were studied. The recommended
doses of oat extract when introduced into milk and the optimal heat treatment conditions of the
milk–oat mixture were determined. The influence of temperature on the gel–forming properties
of oat extract was investigated. The effect of oat extract on rheological behavior, water–holding
ability and shelf life of the finished product was studied. Regular consumption of lactic acid
microorganisms has a positive effect on the digestive system and metabolism. Based on the
organoleptic characteristics and physicochemical changes during the fermentation process in
comparison with the control sample (without oat extract), the recommended starter culture
combinations (Lactobacillus acidophilus, Lactococcus lactis subsp, Lactobacillus bulgaricus)
were proposed
Features of the software of SCADA-system in power industry
In article features of a program software of SCADA-systems are reflected in power industry. SCADA can be a part of industrial control system, ASKUE (an industrial control system, automated systems of the accounting of energy carriers), a scientific experiment, automation of the building. Application of SCADA in power engineering can be realized by means of the laboratory benchВ статье отражены особенности программного обеспечения SCADA-систем в электроэнергетике. SCADA может являться частью АСУ ТП, АСКУЭ (автоматизированная система управления технологическим процессом, автоматизированные системы учета энергоносителей), научного эксперимента, автоматизации здания. Применение SCADA в энергетике можно осуществить с помощью лабораторного стенд
Salt marsh vegetation of the southern tundra subzone of Western Siberia: An example of the Baydaratskaya Bay coasts in the Kara Sea
The study is focused on the description of the vegetation and the general environment all characteristics of the salt marshes along coasts in the Baydaratskaya Bay there are of the Kara Sea in the southern tundra subzone of Russian Arctic. In tidal salt marsh habitats, several successional stages and types of communities depending on part of tidal zone. The plant communities study areas located close to research stations were represented by 50 species of vascular plant, 15 mosses and 3 lichens. The coastal vegetation tends to be floristically intermediate between the species composition of typical salt marshes communities (obligate and facultative halophytes) and species from adjacent tundra plains which can be able to tolerate occasional flooding by salt water. Zonation of salt marsh vegetation and floristic diversity were compared with the data for northern area of Kara Sea coasts
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