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Search Results: 1 - 10 of 324706 matches for " Dementyeva E. G. "
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The abstract of the lesson “The Ring Of The Druids”
Dementyeva E. G.
Sociosfera , 2011,
Abstract: The abstract of the lesson “The Ring of the Druids” is presented. The given lesson is based on the authentic belles-lettres text. The themes of the text help students to be aware of an early period of Great Britain history, to learn more about the Roman invasions era. This period is one of the most important for understanding specific character of the development of the English language and English culture.
A Regulatory Potential of the Xist Gene Promoter in Vole M. rossiaemeridionalis
Konstantin E. Orishchenko, Sophia V. Pavlova, Eugeny A. Elisaphenko, Vladimir V. Sherstyuk, Alexander V. Prinz, Alexander I. Shevchenko, Elena V. Dementyeva, Suren M. Zakian
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0033994
Abstract: X chromosome inactivation takes place in the early development of female mammals and depends on the Xist gene expression. The mechanisms of Xist expression regulation have not been well understood so far. In this work, we compared Xist promoter region of vole Microtus rossiaemeridionalis and other mammalian species. We observed three conserved regions which were characterized by computational analysis, DNaseI in vitro footprinting, and reporter construct assay. Regulatory factors potentially involved in Xist activation and repression in voles were determined. The role of CpG methylation in vole Xist expression regulation was established. A CTCF binding site was found in the 5′ flanking region of the Xist promoter on the active X chromosome in both males and females. We suggest that CTCF acts as an insulator which defines an inactive Xist domain on the active X chromosome in voles.
The Influence of Ceric Oxide on Phase Composition and Activity of Iron Oxide Catalysts  [PDF]
Aleksandr A. Lamberov, Ekaterina V. Dementyeva, Dmitriy I. Vavilov, Olga V. Kuzmina, Rinat R. Gilmullin, Ekaterina A. Pavlova
Advances in Chemical Engineering and Science (ACES) , 2012, DOI: 10.4236/aces.2012.21004
Abstract: The process of dehydrogenation of methyl butenes to isoprene is conducted in the presence of iron oxide catalysts whose composition may include oxides of alkaline metals, alkaline earth metals, and transition metals. Catalysts of latest generation can also contain oxides of rare earth elements, particularly cerium oxide. However there is no any common opinion concerning its effect on catalytic properties of iron oxide catalysts. It is well known that ceric oxide has a positive effect on the quantity and stability of active centers and can play a critical role in a redox cycle of the dehydrogenation process. By means of differential thermal analysis, dispersion analysis and X-ray phase analysis, it was found in present study that introducing of ceric oxide promotes the decrease in hematite crystallite sizes. At the same time, it prevents potassium polyferrites formation, with the equilibrium of topochemical reaction between ferric oxide and po tassium carbonates moving predominantly to the formation of intermediate products–monoferrite systems, having greater catalytic activity. The increase in potassium monoferrite content results in dispersion of particles in the Fe2O3-K2CO3-СеО2 system that is accompanied by modification of texture characteristics. For this catalyst composition, the optimum concentration of ceric oxide (8.7 wt.%), leading to the formation of a certain ratio of mono- and polyferrite phases, was found. If more than 8.7 wt.% of СеО2 is introduced, the modification of texture characteristics of catalyst samples takes place, that negatively affects their selectivity.
Analysis of the Low-Energy π±p Elastic-Scattering Data  [PDF]
E. Matsinos, G. Rasche
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.310174
Abstract: We report the results of a phase-shift analysis (PSA) of the low-energy π±p elastic-scattering data. Following the method which we had set forth in our previous PSA [1], we first investigate the self-consistency of the low-energy π±p elastic-scattering databases, via two separate analyses of (first) the π+p and (subsequently) the π-p elastic-scattering data. There are two main differences to our previous PSA: 1) we now perform only one test for the acceptance of each data set (based on its contribution to the overall 2) and 2) we adopt a more stringent acceptance criterion in the statistical tests. We show that it is possible to obtain self-consistent databases after removing a very small amount of the data (4.57% of the initial database). We subsequently fit the ETH model [38] to the truncatedπ±p elastic-scattering databases. The model-parameter values show reasonable stability when subjected to different criteria for the rejection of single data points and entire data sets. Our result for the pseudovector πNN coupling constant is 0.0726±0.0014. We extract the scattering lengths and volumes, as well as the s- and p-wave hadronic phase shifts up to T = 100 MeV. Large differences in the s-wave part of the interaction can be seen when comparing our hadronic phase shifts with the current SAID solution (WI08); there is general agreement in the p waves, save for the ~1/21- hadronic phase shift.
Rheological, Organoleptical and Quality Characteristics of Gluten-Free Rice Cakes Formulated with Sorghum and Germinated Chickpea Flours  [PDF]
Mohamed G. E. Gadallah
Food and Nutrition Sciences (FNS) , 2017, DOI: 10.4236/fns.2017.85037
Abstract: Gluten-free bakery products are produced for people suffering from celiac disease due to sensitivity to gluten. So, the aim of this work was to study the effect of partial substitution of rice flour at 20%, 30% and 40% with sorghum and germinated chickpea flours on rheological, physical, sensory properties and staling rate of prepared gluten-free cake. Obtained results showed that germinated chickpea flour had the highest contents of crude protein (23.62%), lipids (4.89%) and crude fibers (5.76%) as compared to other grain flours. Gradual increase in gelatinization temperature and decrease in maximum viscosity and setback were fond of cake batters with increasing the substituting levels of rice flour from 20% to 40% with sorghum or germinated chickpea flours in comparison to rice flour batter. No significant difference was observed in specific volume between rice cake and cake containing 20% of germinated chickpea and sorghum flours which given 2.71, 2.62 and 2.56 cm3/g, respectively. Data also revealed that gluten-free cake lightness (L*) and total intensity significantly increased with 40% of sorghum flour followed by 30 and 20% of sorghum flour. Substitution of 40% rice flour with germinated chickpea flour resulted in significant high in redness (a*), yellowness (b*) and chroma of gluten-free cake being 11.95, 33.72 and 35.77, respectively followed by substituted levels 30% and 20% which attributed to their natural yellow pigments compared with other investigated samples. Overall acceptability of gluten-free cakes was improved after adding 20, 30% of sorghum flour and 20% of germinated chickpea flour which being 90.7, 88.6 and 87.5, respectively compared to rice flour cake (88.4). Rice flour cake was more freshness than wheat flour cake and other treatments during storage duration. After 6 days, rice cake had significant high freshness (306.2%) followed by gluten-free cake samples with 20% of sorghum or germinated chickpea flours which given 294.5% and 289.4%, respectively. Generally, it could be concluded that the quality and nutritional properties of gluten-free
System Analysis of Mystery Shopping Data: ISO 9001 for Control of Service Quality  [PDF]
E. G. Aminev, Qing Wang
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.29023
Abstract:

The dynamics of service staff in advertences in the filling stations network of one of the largest Russian oil company was investigated. Errors of personnel were revealed from mystery shopping questionnaires and it was proved that the distribution of mistakes can be described by refusing theory. Zipf-Mandelbrot’s model of the statistical structure of languages and, likewise, Gompertz- Makeham’s law of human mortality, are not allowed for approximation. Customer loyalty can be effectively predicted by methods of fast integer linear programming. Relevance factors allow one to authentically judge which components of social behaviour of the personnel have the greatest influence on the benevolence of clients to a company. The personnel are given concrete technologies of training design, statistical methods of detection of incorrect questions and algorithms of estimation of mystery consumer attainment. It is proposed to amend the recommendations of statistical methods to supplement the standard “quality management System” ISO 9001:2008 in the parts concerning with such subjects as personnel, education, training and the modeling of service quality.

Advancing the Backtrack Optimization Technique to Obtain Forecasts of Potential Crisis Periods  [PDF]
E. G. Lisgara, G. I. Karolidis, G. S. Androulakis
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.330214
Abstract: Financial crisis is an unfortunate reality that overshadows any financial system regardless its profitability and the level it functions. The appearance of crises across financial markets, especially during the 1990s that the internationalized markets adopted a rather approachable character, imposed severe costs in financial and social systems. With this paper is proposed the generation of a future interval of time that is vulnerable to enclose the burst of a financial crisis. A time series consisted of approximations of the local Lipschitz constant is examined and in the proposed forecasting approach this constant holds the crisis indicator role. Further the application of two different optimization techniques over the Lipschitz-made time series results to the generation of a future period of time; this interval is likely to envelop the burst of a forthcoming crisis. The usage of a future interval of time empowers the predicting ability of the methodology by providing warning signs priory to the actual crisis burst. To this direction, the obtained results offer strong evidence that the method may be characterized as an Early Warning System (EWS) for financial crisis prediction.
Ca-Al Hydrotalcites as Catalysts for Methanolysis and Ethanolysis of Soybean Oil  [PDF]
E. A. N. Simonetti, G. P. Thim, G. G. Cortez
Modern Research in Catalysis (MRC) , 2014, DOI: 10.4236/mrc.2014.34015
Abstract: The use of heterogeneous catalysts in the transesterification reaction of vegetable oils has getting emphasis in recent years, mainly by the alternative of obtaining clean fuel derived from renewable sources. Metal oxide such as MgO or CaO, supported ones like \"\" and zeolites are often applied in transesterification process. Among them, hydrotalcite has shown potential as catalysts on this reaction due to their physicochemical properties, such as: thermal stability, porosity, specific surface area, memory effect, basicity, acidity and anion exchange capacity. This work studies the catalytic performance of the calcium and aluminum based hydrotalcite in the transesterification reaction of soybean oil in methanol and ethanol. The hydrotalcite samples treated at 450?C were impregnated with KOH. The efficiency of impregnated and non- impregnated samples was compared and the non-impregnated one showed the best performance. This property was attributed to the higher availability of active sites used in the transesterification process.
Dynamics of the Two Heterochromatin Types during Imprinted X Chromosome Inactivation in Vole Microtus levis
Evgeniya A. Vaskova, Elena V. Dementyeva, Alexander I. Shevchenko, Sophia V. Pavlova, Elena V. Grigor'eva, Antonina I. Zhelezova, John L. VandeBerg, Suren M. Zakian
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0088256
Abstract: In rodent female mammals, there are two forms of X-inactivation – imprinted and random which take place in extraembryonic and embryonic tissues, respectively. The inactive X-chromosome during random X-inactivation was shown to contain two types of facultative heterochromatin that alternate and do not overlap. However, chromatin structure of the inactive X-chromosome during imprinted X-inactivation, especially at early stages, is still not well understood. In this work, we studied chromatin modifications associated with the inactive X-chromosome at different stages of imprinted X-inactivation in a rodent, Microtus levis. It has been found that imprinted X-inactivation in vole occurs in a species-specific manner in two steps. The inactive X-chromosome at early stages of imprinted X-inactivation is characterized by accumulation of H3K9me3, HP1, H4K20me3, and uH2A, resembling to some extent the pattern of repressive chromatin modifications of meiotic sex chromatin. Later, the inactive X-chromosome recruits trimethylated H3K27 and acquires the two types of heterochromatin associated with random X-inactivation.
Quasi Exact Solution of the Fisher Equation  [PDF]
G. Dattoli, E. Di Palma, E. Sabia, S. Licciardi
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.48A002
Abstract: We propose an accurate non numerical solution of the Fisher Equation (FE), capable of reproducing the known analytical solutions and those obtained from a numerical analysis. The form we propose is based on educated guesses concerning the possibility of merging diffusive and logistic behavior into a single formula.
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