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Search Results: 1 - 6 of 6 matches for " Ievgeniia Zhylkova "
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FSHR Gene Polymorphisms Causes Male Infertility  [PDF]
Ievgeniia Zhylkova, Oleksandr Feskov, Olena Fedota
Open Journal of Genetics (OJGen) , 2016, DOI: 10.4236/ojgen.2016.61001
Abstract: Prior studies suggested sperm with damaged DNA permits fertilization but may lead to failure of embryo implantation following blastocyst formation. Quantitative correlations between DNA damage and risk of implantation failure have, however, so far not been performed. The aim of this study was to investigate two FSHR gene polymorphisms G919A (Ala307Thr) and A2039G (Asn680Ser) in Eastern Ukrainian Caucasian men with abnormally low fertility. The molecular genetic analysis was performed by real-time PCR, with the level of DNA fragmentation measured by the sperm chromatin dispersion (SCD) method. The relationship between DNA fragmentation in sperm and these genetic polymorphisms was estimated. Compared to homozygotes, the risk of high-level DNA fragmentation (>20%) increased in men up to age 35 years 16-fold for heterozygotes GA of polymorphic variant G919A, 28-fold for homozygotes AA of polymorphic variant G919A; and 16-fold for heterozygotes GG of polymorphic variant A2039G. A statistically significant positive correlation between number of alternative alleles of the FSHR gene in genotype and degree of DNA fragmentation is proved (rs = 0.70, P < 0.01).
Dynamics of bacterioplankton in water bodies contaminated with nitrogen
Ievgeniia Starosyla
Limnological Papers , 2007, DOI: 10.2478/v10232-011-0010-3
Abstract: There have been presented the results of the microbiological research for 2003-2005 into the cascade of ponds in the dendropark Aleksandriya (the town of Belaya Tserkov). The water of thereof had concentration of mineral nitrogen typical of hypertrophic water bodies (69.9-413.9 mg N/l). The amount of oxygen dissolved in the water was equal to 48.5-7.2%. The number and biomass of the bacterioplankton in ponds varied from 3.4 to 23.2 × 106/cells ml-1, from 64.6 to 412.4 μg C/l-1 respectively. During the whole period of the observation rod-shaped bacteria prevailed in the number and biomass of the bacterioplankton (68.0-85.0% and 62.8-77.1% accordingly); coccal forms reached 9.7-22.1% of the total number and 12.7-28.0% of the biomass of bacteria; curve-shaped bacteria - 0.9-18.9% and 1.9-23.3% respectively. The average volumes of rod-shaped bacteria amounted to 0.054 μm3, cocci - 0.074 μm3, curve-shaped cells to 0.191 μm3. In the most contaminated pond where ammonia nitrogen reduced, the volumes of cells, number and biomass of bacterioplankton rose, which indicated active processes of assimilation N-NH4 by bacteria using it to synthesize amino acids.
Magnetostriction-driven multiferroicity of MnTe and MnTe/ZnTe epitaxial films
Helen V. Gomonay,Ievgeniia G. Korniienko
Physics , 2008,
Abstract: Here we demonstrate that MnTe epitaxial films with zinc-blend structure and MnTe/ZnTe multilayers should show ferroelectric polarization in antiferromagnetically (AFM) ordered state and thus belong to multiferroics. Spontaneous ferroelectric polarization results from the bending of highly ionic Mn-Te-Mn bonds induced by magnetostrictive shear strain. Orientation of ferroelectric polarization is coupled with orientation of AFM vector and thus can be controlled by application of the external magnetic field. Due to the clamping of electric and magnetic order parameters, domain structure in MnTe is governed by two mechanisms: depolarizing field produced by electric dipoles and destressing field produced by magnetoelastic dipoles. The values of monodomainization electric and magnetic fields depend upon the sample shape and diminish with the film thickness. Magnetoelectric nature of the domains make it possible to visualize the domain structure by linear and nonlinear optical methods (Kerr effect, second harmonic generation technique).
Magneto-optical Kramers-Kronig analysis
Julien Levallois,Ievgeniia Nedoliuk,Iris Crassee,Alexey B. Kuzmenko
Physics , 2015, DOI: 10.1063/1.4914846
Abstract: We describe a simple magneto-optical experiment and introduce a magneto-optical Kramers-Kronig analysis (MOKKA) that together allow extracting the complex dielectric function for left- and right-handed circular polarizations in a broad range of frequencies without actually generating circularly polarized light. The experiment consists of measuring reflectivity and Kerr rotation, or alternatively transmission and Faraday rotation, at normal incidence using only standard broadband polarizers without retarders or quarter-wave plates. In a common case, where the magneto-optical rotation is small (below $\sim$ 0.2 rad), a fast measurement protocol can be realized, where the polarizers are fixed at 45$^\circ$ with respect to each other. Apart from the time-effectiveness, the advantage of this protocol is that it can be implemented at ultra-high magnetic fields and in other situations, where an \emph{in-situ} polarizer rotation is difficult. Overall, the proposed technique can be regarded as a magneto-optical generalization of the conventional Kramers-Kronig analysis of reflectivity on bulk samples and the Kramers-Kronig constrained variational analysis of more complex types of spectral data. We demonstrate the application of this method to the textbook semimetals bismuth and graphite and also use it to obtain handedness-resolved magneto-absorption spectra of graphene on SiC.
Transcriptome of the Alternative Ethanol Production Strain Dekkera bruxellensis CBS 11270 in Sugar Limited, Low Oxygen Cultivation
Ievgeniia A. Tiukova, Mats E. Petterson, Christian Tellgren-Roth, Ignas Bunikis, Thomas Eberhard, Olga Vinnere Pettersson, Volkmar Passoth
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0058455
Abstract: Dekkera bruxellensis can outcompete Saccharomyces cerevisiae in environments with low sugar concentrations. It is usually regarded as a spoilage yeast but has lately been identified as an alternative ethanol production organism. In this study, global gene expression in the industrial isolate D. bruxellensis CBS 11270 under oxygen and glucose limitation was investigated by whole transcriptome sequencing using the AB SOLiD technology. Among other observations, we noted expression of respiratory complex I NADH-ubiquinone reductase although D. bruxellensis is a Crabtree positive yeast. The observed higher expression of NADH-generating enzymes compared to NAD+-generating enzymes might be the reason for the previously observed NADH imbalance and resulting Custer effect in D. bruxellensis. Low expression of genes involved in glycerol production is probably the molecular basis for high efficiency of D. bruxellensis metabolism under nutrient limitation. No D. bruxellensis homologs to the genes involved in the final reactions of glycerol biosynthesis were detected. A high number of expressed sugar transporter genes is consistent with the hypothesis that the competitiveness of D. bruxellensis is due to a higher affinity for the limiting substrate.
Fabry-Perot enhanced Faraday rotation in graphene
Nicolas Ubrig,Iris Crassee,Julien Levallois,Ievgeniia O. Nedoliuk,Felix Fromm,Michl Kaiser,Thomas Seyller,Alexey B. Kuzmenko
Physics , 2013, DOI: 10.1364/OE.21.024736
Abstract: We demonstrate that giant Faraday rotation in graphene in the terahertz range due to the cyclotron resonance is further increased by constructive Fabry-Perot interference in the supporting substrate. Simultaneously, an enhanced total transmission is achieved, making this effect doubly advantageous for graphene-based magneto-optical applications. As an example, we present far-infrared spectra of epitaxial multilayer graphene grown on the C-face of 6H-SiC, where the interference fringes are spectrally resolved and a Faraday rotation up to 0.15 radians (9{\deg}) is attained. Further, we discuss and compare other ways to increase the Faraday rotation using the principle of an optical cavity.
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