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Gestrin S.G.,Saratov State Agrarian University | Shchukina E.V.,Saratov State Technical University
Russian Physics Journal | Year: 2016

It is demonstrated that propagation of the soliton described by the Boussinesq equation along a linear defect of the crystal structure leads to radiation of sound waves (analog of the Vavilov–Cherenkov effect). Radiation that has a continuous spectrum diverges conically from the dislocation line, and the apex angle of the cone is determined by the ratio of the sound speed in the crystal to the soliton speed. With increasing soliton speed, the maximum of the spectral flux density of sound energy is displaced toward higher frequencies. An analytical expression for energy losses is derived. © 2016, Springer Science+Business Media New York.


Gestrin S.G.,Saratov State Agrarian University | Shchukina E.V.,Saratov State Technical University
Russian Physics Journal | Year: 2015

Sound waves in a piezoelectric medium containing a chain of dislocations parallel to each other are investigated. It is demonstrated that interaction between vibrations localized on individual dislocations engenders waves propagating along the chain in the direction perpendicular to dislocations. The spectrum of allowable vibration frequencies consists of bands separated from each other and from the spectrum of volume vibrations. The total number of different independent wave vectors corresponding to frequencies forming a band is equal to the number of independent states of the vibrating dislocation chain and coincides with the number of dislocations contained in it. © 2015 Springer Science+Business Media New York


Gestrin S.G.,Saratov State Agrarian University | Schukina E.V.,Saratov State Technical University
Russian Physics Journal | Year: 2014

Longitudinal oscillations localized on dislocations are shown to exist in C4v piezoelectric crystals. Dispersion equations are constructed for axially symmetric and localized screw waves. Frequency regions separating their frequencies from the spectrum of volume oscillations are identified. © 2014 Springer Science+Business Media New York.


Gestrin S.G.,Saratov State Agrarian University | Schukina E.V.,Saratov State Technical University
Russian Physics Journal | Year: 2014

Coupled sonic waves localized on dislocations in a piezoelectric crystal are investigated. The frequencies of in-phase and counter-phase oscillations in a system of two dislocations are found out. It is shown that due to the intrinsic resonance the oscillation energy is alternately concentrated near one dislocation or the other. The complete or partial energy exchange occurs, provided there is an arbitrary weak coupling in the system. As the interaction is decreased, the energy exchange between the dislocations is only slowed down. © 2014 Springer Science+Business Media New York.


Guliy O.I.,Saratov State Agrarian University | Zaitsev B.D.,RAS Institute of Radio Engineering and Electronics | Kuznetsova I.E.,RAS Institute of Radio Engineering and Electronics | Borodina I.A.,RAS Institute of Radio Engineering and Electronics | Ignatov O.V.,Russian Academy of Sciences
Current Immunology Reviews | Year: 2016

The bacterial surface is a complex combination of various immunogenic components of genus, species, and strain specificity. Polyclonal and monoclonal antibodies, used widely in the manufacture of diagnostic test systems, have traditionally served as biological components for the specific detection of bacterial cells. In molecular biology, bacterial cell detection is performed with the help of genetic engineering technologies for cloning recognizing fragments (hypervariable immunoglobulin domains (miniantibodies). These technologies are cheaper and can be competitive in selectivity with hybridoma technologies. At present, research is actively working to improve cell detection sensitivity with the use of electro-optical and electro-acoustical analysis, the main problem being to select antibodies with greater analytical sensitivity. This review highlights the use of specific antibodies and miniantibodies in electro-optical and electro-acoustical analysis for the detection of bacterial cells. © 2016 Bentham Science Publishers.


Pankratov A.N.,Chernyshevsky Saratov State University | Tsivileva O.M.,Russian Academy of Sciences | Drevko B.I.,Saratov State Agrarian University | Nikitina V.E.,Russian Academy of Sciences
Journal of Biomolecular Structure and Dynamics | Year: 2011

The role of spatial and electron structure, hydrophobic properties and concentration of organoselenium compounds on their interaction with fungal metabolites - extracellular lectins of Lentinula edodes (shiitake mushroom) has been considered. By the hybrid method of density functional theory at the B3LYP/6-31G(d,p) theory level, spatial and electronic structure of the 1,5-diphenyl-3-selenopentanedione-1,5 (preparation DAPS-25), 1,5-di(4-methoxyphenyl)-3-selenopentanedione-1,5 and 1,5-di(4-ethoxyphenyl)-3- selenopentanedione-1,5 molecules has been studied. The above molecules have been stated to be substantially similar to each other by their electronic and spatial characteristics. By means of the QSAR properties evaluation by the atomic-additive schemes, it has been shown that the molecules of the preparation DAPS-25, its dimethoxy- and diethoxy-substituted are close to each other by the hydrophilic-lipophilic balance, whereas di-n-octoxy derivative DAPS-25 is explicitly hydrophobic. The hemagglutinating activity of lectins in the presence of the preparation DAPS-25 and its alkyloxy-substituted increases, therewith the most effective addition is 1,5-di(4-ethoxyphenyl)-3-selenopentanedione-1,5. Apparently, the greater effectiveness of the said substance compared to DAPS -25 is caused by the formation of hydrogen bonds with a participation of unshared electron pairs of oxygen atoms from the ethoxy groups and mobile hydrogen atoms from the OH groups of glycoconjugates on erythrocytes surface. The positive effect of 1,5-di(4-n-octoxyphenyl)-3-selenopentanedione-1,5 is not so prominent, since the enlarged alkyl chain shields the aromatic fragments of organoselenium molecule participating in the binding with lectin. ©Adenine Press (2011).


Kuznetsov V.A.,Saratov State Agrarian University
Semiconductors | Year: 2010

A technique for determining the depth of band gap sagging and the mechanism of this effect (related to the deformation potential, which may arise in the range of existence of mixed alloy systems) has been proposed based on analysis of the energy diagrams of II-VI semiconductor compounds. Choosing a proper composition of a binary or ternary system, one can increase its photosensitivity in a specified spectral range due to the band gap sagging. © 2010 Pleiades Publishing, Ltd.


Kuznetsov V.A.,Saratov State Agrarian University
Russian Physics Journal | Year: 2011

It is demonstrated that the resonant mechanism on inhomogeneities formed for a fixed distribution of dielectric permittivity can underlie the directed self-organization of the electron flow in semiconductors. The behavior of the resonant flow velocity amplitudes depending on the inhomogeneity factors is considered in the ballistic regime. © 2011 Springer Science+Business Media, Inc.


Ulianova O.V.,Saratov State Agrarian University | Ulianov S.S.,Chernyshevsky Saratov State University | Li P.,Wuhan University of Science and Technology | Luo Q.,Wuhan University of Science and Technology
Quantum Electronics | Year: 2011

A new method of photoinactivation of bacteria aimed at producing prototypes of vaccine preparations against extremely dangerous infections is described. The reactogenicity of the new prophylactic preparations was studied using the laser speckle contrast analysis (LASCA). The performed experimental studies show that bacterial suspensions, irradiated using different regimes of photo- inactivation, do not cause detrimental effect on the blood microcirculation in laboratory animals. © 2011 Kvantovaya Elektronika and Turpion Ltd.


Kuznetsov V.A.,Saratov State Agrarian University
Conference Proceedings - International Conference on Actual Problems of Electron Devices Engineering, APEDE'2010 | Year: 2010

The effect of concentration inhomogeneity is analyzed for some semiconductors. In InSb this efftct occurs under temperature-electrical instability in a magnetic field. In at GaAs-GaP compound, this effect is due to the built-in gradient of static dielectric permeability and electron flow grouping. This effect may be adapted to desing an deflector of the infrared rays. ©2010 IEEE.

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