Vernadsky Crimean Federal University

Simferopol, Russia

Vernadsky Crimean Federal University

Simferopol, Russia
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Yatsenko A.V.,Vernadsky Crimean Federal University
Crystallography Reports | Year: 2017

Possible combinations of the electronic polarizability tensor components for oxygen and tantalum ions have been established based on the analysis of the refraction coefficients of LiТаO3 crystal in the far-IR region. The local electric field on structurally nonequivalent ions in the LiТаO3 unit cell was calculated within the modified point-multipole model. A combination of the electronic polarizability tensor components for oxygen and tantalum ions and their effective charges is established, which provides a good correspondence of the calculation results with the experimental data on LiТаO3 crystals obtained by 7Li nuclear magnetic resonance and 181Та nuclear quadrupole resonance and with the known value of the crystal spontaneous polarization. © 2017, Pleiades Publishing, Inc.


Lelyakov A.P.,Vernadsky Crimean Federal University | Karpenko A.S.,Vernadsky Crimean Federal University
Theoretical and Mathematical Physics(Russian Federation) | Year: 2017

We consider the dynamics of a probe null string in the gravitational field of a closed (“thick”) null string radially collapsing in a plane. Analysis of the obtained solutions suggests that there might exist several properties of a null-string gas interesting from the cosmological standpoint, such as acceleration of expansion or contraction, a granular structure of the gas, the emergence of stable polarized states, and a domain structure. © 2017, Pleiades Publishing, Ltd.


Lelyakov A.P.,Vernadsky Crimean Federal University
Gravitation and Cosmology | Year: 2017

We have found a solution to the Einstein equations for the case of radial expansion or radial collapse of a multistring system having a layered structure. It has been shown that the influence of the gravitational field of such multistring system can lead to stable oscillations of a test null string in the vicinity of a fixed (stationary) point in space, which can be regarded as a spatially localized particle with a nonzero effective rest mass. In this case, the ability of multistring systems to create such particles can be considered as a possible alternative to the Higgs mechanism. It has also been noted that for a gas of null strings, creation of particles with nonzero effective rest mass is possible at early stages of the Universe evolution, where due to high pressures and a domain structure of such a gas, mutual penetration of null strings belonging to neighboring domains was unavoidable and could emerge in mass. At later stages, due to expansion of the Universe, such an opportunity could be lost. © 2017, Pleiades Publishing, Ltd.


Ergina E.I.,Vernadsky Crimean Federal University
Eurasian Soil Science | Year: 2017

Current approaches to the simulation of pedogenesis processes in time are considered. Models for the formation of humus horizon on parent rocks of different genesis in Crimea are presented. Formation rates of humus horizons have been determined, which allows developing the remediation strategies for mining dumps of mineral deposits in Crimea. © 2017, Pleiades Publishing, Ltd.


Oberemok V.V.,Vernadsky Crimean Federal University | Laikova K.V.,Vernadsky Crimean Federal University | Zaitsev A.S.,Vernadsky Crimean Federal University | Gushchin V.A.,Moscow State University | Skorokhod O.A.,University of Turin
Pesticide Biochemistry and Physiology | Year: 2016

Numerous studies suggest a cellular origin for the Lymantria dispar multicapsid nuclear polyhedrosis virus (LdMNPV) anti-apoptosis genes IAPs, thus opening a possibility to use the fragments of these genes for modulation of host metabolism. We report here the strong insecticidal and metabolic effect of single-stranded antisense DNA fragment from RING (really interesting new gene) domain of gypsy moth LdMNPV IAP-3 gene: specifically, on reduction of biomass (by 35%) and survival of L. dispar caterpillars. The treatment with this DNA fragment leads to a significantly higher mortality rates of female insects (1.7 fold) accompanied with the signs of apoptosis. Additionally, we show increased expression of host IAP-1, caspase-4 and gelsolin genes in eggs laid by survived females treated with RING DNA fragment accompanied with calcium and magnesium imbalance, indicating that the strong stress reactions and metabolic effects are not confined to treated insects but likely led to apoptosis in eggs too. The proposed new approach for insect pest management, which can be considered as advancement of "microbial pesticides", is based on the application of the specific virus DNA, exploiting the knowledge about virus-pest interactions and putting it to the benefit of mankind. © 2016 Elsevier B.V.


Tomilin S.V.,Vernadsky Crimean Federal University | Berzhansky V.N.,Vernadsky Crimean Federal University | Yanovsky A.S.,Zaporizhzhya National University | Tomilina O.A.,Vernadsky Crimean Federal University
Journal of Surface Investigation | Year: 2016

Features of the temperature dependence of the conductivity of nanoisland metal films are investigated. It is established that the conductivity is affected, aside from via thermal activation, by ion-field processes caused by the surface diffusion of atoms. The variation in the ion-field conductivity is shown to have an activation character. © 2016, Pleiades Publishing, Ltd.


PubMed | University of Turin, Vernadsky Crimean Federal University and Moscow State University
Type: | Journal: Pesticide biochemistry and physiology | Year: 2016

Numerous studies suggest a cellular origin for the Lymantria dispar multicapsid nuclear polyhedrosis virus (LdMNPV) anti-apoptosis genes IAPs, thus opening a possibility to use the fragments of these genes for modulation of host metabolism. We report here the strong insecticidal and metabolic effect of single-stranded antisense DNA fragment from RING (really interesting new gene) domain of gypsy moth LdMNPV IAP-3 gene: specifically, on reduction of biomass (by 35%) and survival of L. dispar caterpillars. The treatment with this DNA fragment leads to a significantly higher mortality rates of female insects (1.7 fold) accompanied with the signs of apoptosis. Additionally, we show increased expression of host IAP-1, caspase-4 and gelsolin genes in eggs laid by survived females treated with RING DNA fragment accompanied with calcium and magnesium imbalance, indicating that the strong stress reactions and metabolic effects are not confined to treated insects but likely led to apoptosis in eggs too. The proposed new approach for insect pest management, which can be considered as advancement of microbial pesticides, is based on the application of the specific virus DNA, exploiting the knowledge about virus-pest interactions and putting it to the benefit of mankind.


For the first time, a mononuclear biligand complex of lanthanum nitrate with bicyclic bisurea (4,4,10,10-tetramethyl-1,3,7,9-tetraazospiro[5.5]undecane-2,8-dione, or spirocarbon, Sk) [La(C11H20N4O2)2(H2O)2··(NO3)3] (I) is synthesized and its structure is determined by direct single crystal XRD. The crystals of I are monoclinic: space group P21/c, a = 11.1989(15) Å, b = 13.015(2) Å, c = 24.153(2) Å, β = 101.129(12)°, V = 3454.3(8) Å3, dcalc = 1.618 g/cm3, Z = 4, CCDC 985760. The structure is molecular. The lanthanum cation is coordinated by two oxygen atoms of two organic ligand molecules, two water molecules, and three bidentate nitrate anions. The coordination number of lanthanum is ten; the coordination polyhedron is an irregular 10-vertex polyhedron. The crystal of I represents a non-merohedral twin with the components turned by 180° along the a axis; the relative weights of the components are 0.76:0.24. To confirm the purity of the sample of I, the powder XRD pattern was refined using the Rietveld method; the unit cell parameters at room temperature are as follows: a = 11.2777(4) Å, b = 13.0774(5) Å, c = 24.3453(9) Å, β = 101.129(3)°, V = 3523.0(2) Å3. © 2016, Pleiades Publishing, Ltd.


Chuyan E.N.,Vernadsky Crimean Federal University | Tribrat N.S.,Vernadsky Crimean Federal University
Human Physiology | Year: 2016

The effector function of sensory peptidergic perivascular fibers was examined upon multiple exposures to low-intensity millimeter electromagnetic waves by means of laser Doppler flowmetry. Low-intensity millimeter waves (wavelength, 7.1 mm; power density, 0.1 mW/cm2) were shown to increase the microcirculation index, which characterized the change in perfusion upon electrical stimulation, and to decrease the latency from the start of stimulation to the onset of vasodilation, pointing to an increase in the effector function of sensory peptidergic fibers and micruvascular reactivity. © 2016, Pleiades Publishing, Inc.


Kostandov Y.A.,Vernadsky Crimean Federal University
Journal of Mining Science | Year: 2016

The study is devoted to effect of contact friction on failure, ultimate stress and moduli of elasticity in rock specimens under compression. It is found that dependence of the listed characteristics on friction coefficient is incremental. The author reveals zones of full contact and slide. © 2016, Pleiades Publishing, Ltd.

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