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Search Results: 1 - 10 of 71040 matches for " Elena Yu. "
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Features of physiological status of aged people in sparsely circumpolar areas of Russia  [PDF]
Elena Yu. Golubeva, Raisa I. Danilova
Health (Health) , 2012, DOI: 10.4236/health.2012.429116
Abstract: Stable growth of the elderly age group is observed in the population of circumpolar areas of Russia. In northern conditions chronic pathology facilitates activity restriction development, changing the habitual lifestyle. Ageing process involves functional constraints of physical and mental activities, difficulties in doing everyday work. Aging changes of the nervous and respiratory systems are more characteristic of aged men and women living in the nursing home system of Russian urban circumpolar area. These changes are caused by worse psychological state, hypokinesia so there is a need in improving approaches in medical and social care services, in particular, introducing activating technologies and the micro-environment enhancement.
Features of Internal Waves in a Shoaling Thermocline  [PDF]
Vadim V. Navrotsky, Valeriy Yu. Liapidevskii, Elena P. Pavlova
International Journal of Geosciences (IJG) , 2013, DOI: 10.4236/ijg.2013.45081

Observations and numeric modeling of internal wave generation and transformation in the shelf zone of sea show that the main part of tidal energy is transported to shores in form of internal gravitational waves. Long-term measurements of temperature and current velocity fluctuations at many levels in the near-bottom thermocline were carried out during the periods when stable seasonal thermocline was present. Analysis of the measurements permits us to understand mechanisms of internal wave destruction with turbulent motion generation and corresponding rebuilding of velocity and density mean fields in the stratified near-bottom layer. Spectral analysis of temperature fluctuations shows that in shoaling internal waves the low-frequency maxima disappear, maxima at higher frequencies appear, and the spectra slope in the high frequency range changes with depth. Taking into account the concurrent analysis of near-bottom pressure fluctuations and current velocity fluctuations from surface till bottom we come to the conclusion that breaking internal waves in a near-bottom thermocline generate not only small-scale three-dimensional turbulence, but also quasi-horizontal turbulence of larger scales, which considerably contributes into mixing and sediments, alluvium, and nutrients transport in the shelf zone of sea.

A Naturally Occurring Polymorphism at Drosophila melanogaster Lim3 Locus, a Homolog of Human LHX3/4, Affects Lim3 Transcription and Fly Lifespan
Olga Yu. Rybina,Elena G. Pasyukova
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0012621
Abstract: Lim3 encodes an RNA polymerase II transcription factor with a key role in neuron specification. It was also identified as a candidate gene that affects lifespan. These pleiotropic effects indicate the fundamental significance of the potential interplay between neural development and lifespan control. The goal of this study was to analyze the causal relationships between Lim3 structural variations, and gene expression and lifespan changes, and to provide insights into regulatory pathways controlling lifespan. Fifty substitution lines containing second chromosomes from a Drosophila natural population were used to analyze the association between lifespan and sequence variation in the 5′-regulatory region, and first exon and intron of Lim3A, in which we discovered multiple transcription start sites (TSS). The core and proximal promoter organization for Lim3A and a previously unknown mRNA named Lim3C were described. A haplotype of two markers in the Lim3A regulatory region was significantly associated with variation in lifespan. We propose that polymorphisms in the regulatory region affect gene transcription, and consequently lifespan. Indeed, five polymorphic markers located within 380 to 680 bp of the Lim3A major TSS, including two markers associated with lifespan variation, were significantly associated with the level of Lim3A transcript, as evaluated by real time RT-PCR in embryos, adult heads, and testes. A naturally occurring polymorphism caused a six-fold change in gene transcription and a 25% change in lifespan. Markers associated with long lifespan and intermediate Lim3A transcription were present in the population at high frequencies. We hypothesize that polymorphic markers associated with Lim3A expression are located within the binding sites for proteins that regulate gene function, and provide general rather than tissue-specific regulation of transcription, and that intermediate levels of Lim3A expression confer a selective advantage and longer lifespan.
The productivity of Origanum vulgare L. and O. tyttanthum Gontsch., dependently from the methods of planting material producing
Elena F. Boyko,R.Yu. Konik
Modern Phytomorphology , 2012,
Abstract: The result of investigation have shown that the plants obtained from green cuttings in the first year after planting were more developed by morphometric characteristics and were more exceed to parameters of productivity such as: the crop yield of top (in 1.5-2.7 times), the mass percentage of essential oil (in 1.2-3.0 times), collecting oil from the plant (in 1.8-5.5 times) than the plants obtained by dividing the bush. Thus, it’s advisable to use seedlings obtained from green cuttings for laying the industrial plantations of Origanum vulgare and O. tyttanthum .
Cardiovascular Disease Risk Factors and Mortality in Russia: Challenges and Barriers
Igor S. Petrukhin,Elena Yu Lunina
Public Health Reviews , 2011,
Abstract: The article discusses the issue of the high prevalence of cardiovascular risk factors and extremely high mortality rates from cardiovascular disease, especially among people of working ages, in Russia. It justifies the need to reduce excess mortality. Further, it analyzes the trends, structure and the burden of cardiovascular diseases, demonstrates prevalence of major cardiovascular risk factors (psychosocial factors, alcohol abuse, smoking, eating habits, arterial hypertension, low physical activity, obesity, and dyslipidemy) in the Russian population. The measures required to control high mortality from cardiovascular disease and existing barriers in Russia are addressed. A conclusion is made that the lessons learned in western countries over the past 50 years need to be applied in Russia.
Morpho-Histological Analysis of Direct Shoot Organogenesis Induced in Flower Buds Cultures of Allium altissimum  [PDF]
Tatyana V. Poluboyarova, Tatyana I. Novikova, Galina Yu. Vinogradova, Elena V. Andronova
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.513216

The present work gives a detailed study of in vitro shoot organogenesis of the ornamental onion A. altissimum Regel from the buds of the middle layer of the inflorescences. The course of morphogenesis was examined by light and scanning electron microscopy. Histological observation revealed that during 3 - 5 days of culture on the BDS medium supplemented with 2.0 mg·L-1 of BA and 2.0 mg·L-1 of NAA the epidermal cells of the stamen filament in the area of its fusion with the tepal became competent and dedifferentiated. Originally the organogenesis involved several initial epidermal cells. The formation of meristematic centers was observed from day 3 to day 14. The apical shoot meristems and leaf primordia in a roller shape formed from day 14 to day 28 of culture on the same media. The further development of vegetative shoots and formation of the bulblets were observed when the explants were stimulated by triapenthenol (2.0 mg·L-1).

Gravitational and dilaton radiation from a relativistic membrane
Dmitri V. Gal'tsov,Elena Yu. Melkumova
Physics , 2000, DOI: 10.1103/PhysRevD.63.064025
Abstract: Recent scenarios of the TeV-scale brane cosmology suggest a possibility of existence in the early universe of two-dimensional topological defects: relativistic membranes. Like cosmic strings, oscillating membranes could emit gravitational radiation contributing to a stochastic background of gravitational waves. We calculate dilaton and gravitational radiation from a closed toroidal membrane excited along one homology cycle. The spectral-angular distributions of dilaton and gravitational radiation are obtained in a closed form in terms of Bessel's functions. The angular distributions are affected by oscillating factors due to an interference of radiation from different segments of the membrane. The dilaton radiation power is dominated by a few lower harmonics of the basic frequency, while the spectrum of the gravitational radiation contains also a substantial contribution from higher harmonics. The radiative lifetime of the membrane is determined by its tension and depends weakly on the ratio of two radii of the torus. Qualitatively it is equal to the ratio of the membrane area at the maximal extension to the gravitational radius of the membrane as a whole.
On Site Percolation on Correlated Simple Cubic Lattice
Yuriy Yu. Tarasevich,Elena N. Manzhosova
Physics , 2003, DOI: 10.1142/S0129183103005480
Abstract: We consider site percolation on a correlated bi-colored simple cubic lattice. The correlated medium is constructed from a strongly alternating bi-colored simple cubic lattice due to anti-site disordering. The percolation threshold is estimated. The cluster size distribution is obtained. A possible application to the double 1:1 perovskites is discussed.
Elliptic formal group laws, integral Hirzebruch genera and Krichever genera
Victor M. Buchstaber,Elena Yu. Bunkova
Mathematics , 2010,
Abstract: We consider the geometrical addition law on the elliptic curve in Tate coordinates. It corresponds to the general formal group law over the ring of polynomials with integer coefficients of the parametra of the curve. We study the structure of this law and the differential equation that determines its exponent. We describe a 5-parametric family of Hirzebruch genera with integer values on stably complex manifolds. We introduce the general Krichever genus, which is given by a generalized Baker-Akhiezer function. This function has many of the fundamental properties of the Baker-Akhiezer function, but unlike it, it is not meromorphic, because it can have two branch points in the parallelogram of periods.
Algebraically integrable quadratic dynamical systems
Victor M. Buchstaber,Elena Yu. Bunkova
Mathematics , 2012,
Abstract: We consider in C^n the class of symmetric homogeneous quadratic dynamical systems. We introduce the notion of algebraic integrability for this class. We present a class of symmetric quadratic dynamical systems that are algebraically integrable by the set of functions h_1(t), ..., h_n(t) where h_1(t) is any solution of an ordinary differential equation of order n and h_k(t) are differential polynomials in h_1(t), k = 2, ..., n. We describe a method of constructing this ordinary differential equation. We give a classification of symmetric quadratic dynamical systems and describe the maximal subgroup in GL(n, C) that acts on this systems. We apply our results to analysis of classical systems of Lotka-Volterra type and Darboux-Halphen system and their modern generalizations.
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