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Search Results: 1 - 10 of 10 matches for " Jumber Kereselidze "
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Quantum-Chemical Description of Influence of the R-Groups on Formation of Peptide Bond  [PDF]
Jumber Kereselidze, Marine Kvaraia, George Mikuchadze
Computational Molecular Bioscience (CMB) , 2014, DOI: 10.4236/cmb.2014.42004
Abstract: The description of influence of the R-groups on formation of the peptide bond by quantum-chemical method of density functional theory (DFT) is carried out. The criterion of probability of formation of the peptide bond has been constructed. In particular it is shown that the propensity to formation of the peptide bond is increased as a result of 1) decrease of the CO and NH bond orders (PCO and PNH) and of activation energy (ΔE#), 2) increase of OH and CN bond orders (POH and PCN), 3) exothermic property of this reaction (ΔE < 0).
Electronic structure of nanorod of strongly prolate ellipsoidal shape
T. Kereselidze,T. Tchelidze,T. Nadareishvili
Physics , 2013,
Abstract: A charged particle (electron or hole) confined in nanorod of strongly prolate ellipsoidal shape is considered. The effective-mass Schr\"odinger equation is solved in prolate spheroidal coordinates and asymptotically exact expressions for the energy spectrum and wavefunctions are derived. It is shown that the treatment of the confinement energies is incorrect if the actual shape of ellipsoidal nanorod is not taken into account. In particular, developed earlier the approach based on the consideration of the problem in cylindrical coordinates with the use of parabolic potential leads to the incorrect expression for the energy spectrum. Rule of correlation between the states corresponding to spherical quantum dot and nanorod of strongly prolate ellipsoidal shape is suggested and an appropriate energy correlation diagram is constructed. The correlation diagram is in complete qualitative and quantitative agreement with the energy diagram obtained by numerical solution of the Schr\"odinger equation in spheroidal coordinates.
The model of self-generated seismo-electromagnetic oscillations of the LAI system
M. K. Kachakhidze, Z. A. Kereselidze,N. K. Kachakhidze
Solid Earth (SE) & Discussions (SED) , 2011, DOI: 10.5194/se-2-17-2011
Abstract: Very low frequency (VLF) electromagnetic radiation (in diapason 1 kHz–1 MHz) in the atmosphere, generated during an earthquake preparation period, may be connected with the linear size characterising the expected earthquake focus. In order to argue this hypothesis, a very simple quasi-electrostatic model is used: the local VLF radiation may represent the self-generated (own) electromagnetic oscillations of interactive seismoactive segments of the lithosphere-atmosphere system. This model qualitatively explains the well-known precursor effects of earthquakes. In addition, using this model after diagnosing existing data makes it principally possible to forecast an expected earthquake with certain precision. As a physical basis of the working hypothesis is the atmospheric effect of polarization charges occurring in the surface layer of the Earth, it is possible to test the following constructed model in the Earth's crust, where the reason for polarization charge generation may be different from piezo-electric mechanism, e.g., some other mechanism.
The model of own seismoelectromagnetic oscillations of LAI system
M. K. Kachakhidze,Z. A. Kereselidze,N. K. Kachakhidze
Solid Earth Discussions , 2010, DOI: 10.5194/sed-2-233-2010
Abstract: Very low frequency (VLF) electromagnetic radiation (in diapason 1 kHz – 1 MHz) in atmosphere, generated during earthquake preparation period, may be connected with linear size, characterizing incoming earthquake source. In order to argue this hypothesis very simple quasi-electrostatic model is used: local VLF radiation may be the manifestation of own electromagnetic oscillations of concrete seismoactive segments of lithosphere-atmosphere system. This model explains qualitatively well-known precursor effects of earthquakes. At the same time, it will be principally possible to forecast expected earthquake with certain precision if we use this model after diagnosing existed data. As physical basis of working hypothesis is atmospheric effect of polarization charges occurred in surface layer of the Earth, it is possible to test the below constructed model in medium, where reasons of polarization charge generation may be different from piezoelectric mechanism, for example, due to electrolytic hydration.
Specific variations of the atmospheric electric field potential gradient as a possible precursor of Caucasus earthquakes
N. Kachakhidze,M. Kachakhidze,Z. Kereselidze,G. Ramishvili
Natural Hazards and Earth System Sciences (NHESS) & Discussions (NHESSD) , 2009,
Abstract: The subject of the research is the study of anomalous disturbances of the gradient of electric field potential of the atmosphere as possible precursors of earthquakes. In order to reveal such precursor Dusheti observatory (φ=42.05; λ=44.42) records of electric field potential's gradient (EFPG) of the atmosphere are considered for 41 earthquakes (M≥5.0) occurrence moments in the Caucasus region. Seasonal variations of atmospheric electric field potential gradient and inter overlapping influence of meteorological parameters upon this parameter are studied. Original method of "filtration" is devised and used in order to identify the effect of EFPG "clear" anomalies. The so-called "clear" anomalies are revealed from ( 148.9 V/m) to 188.5 V/m limits and they are connected with occurrence moments of 29 earthquakes out of 41 discussed earthquakes (about 71%). "clear" anomalies manifest themselves in 11-day precursor window. Duration of anomalies is from 40 to 90 min.
Evaluation of Atmospheric Electric Field as Increasing Seismic Activity Indicator on the example of Caucasus Region
M. K. Kachakhidze,Z. A. Kereselidze,N. K. Kachakhidze
Physics , 2012,
Abstract: The present paper deals with reliability of a gradient of atmospheric electric field potential as an indicator of seismic activity increase. With this in view, records of atmospheric electric field potential gradients of Caucasus region for 1953-1992 with respect to periods before average and large earthquakes, which took place in the same time interval, were considered. It is worth to pay attention to the fact that the avalanche-like unstable model of fault formation based on theoretical model of self-generated seismo-electromagnetic oscillations of LAI system explains convincingly spectral succession of electromagnetic emission frequency of the periods preceding earthquakes.
Chaos, Fractal and Quantum Poincare Recurrences in Diamagnetic Kepler Problem
A. Ugulava,L. Chotorlishvili,T. Kereselidze,V. Skrinnikov
Physics , 2006,
Abstract: The statistics of quantum Poincare recurrences in Hilbert space for diamagnetic hydrogen atom in strong magnetic field has been investigated. It has been shown that quantities characterizing classical chaos are in a good agreement with the ones that are used to describe quantum chaos. The equality of classical and quantum Poincare recurrences has been shown. It has been proved that one of the signs of the emergence of quantum chaos is the irreversible transition from a pure quantum mechanical state to the mixed one.
The Model of the Mechanism of the VLF/LF, ULF Emission Influence on the Local Meteorological Processes During the Earthquake Preparation Period
M. K. Kachakhidze,Z. A. Kereselidze,N. K. Kachakhidze
Physics , 2013,
Abstract: Atmospheric electric field inversion gives theoretical base for local weather management.
Cytotoxic Steroidal Saponins from the Flowers of Allium leucanthum
Lasha Mskhiladze,Jean Legault,Serge Lavoie,Vakhtang Mshvildadze,Jumber Kuchukhidze,Riad Elias,André Pichette
Molecules , 2008, DOI: 10.3390/molecules13122925
Abstract: Allium leucanthum C. Koch is an endemic Caucasian species that grows in Georgia. The flowers are used in traditional medicine. Phytochemical investigation allowed the isolation of seven spirostanol type saponins from the flowers. Their structures were elucidated on the base of NMR and HRESIMS spectrometry data. A new compound, which we have named leucospiroside A (5), has been identified as (25R)-5α-spirostane-2α,3β,6β-triol 3-O-β-glucopyranosyl-(1→3)-β-glucopyranosyl-(1→2)-[β-glucopyranosyl-(1→3)]-β-glucopyranosyl-(1→4)-β-galactopyranoside. The six others were known substances, but are described in this plant for the first time. The crude extract, spirostanol and furostanol fractions, as well as isolated compounds, were evaluated for their in vitro cytotoxic activity. Compounds 1-3 and 5 were found to be the most active, with relatively similar IC50 values ranging from 3.7 to 5.8 μM for a lung cancer cell line (A549) and 5.6 to 8.2 μM for a colon cancer cell line (DLD-1).
In connection with identification of VLF emissions before L'Aquila earthquake
M. K. Kachakhidze,Z. A. Kereselidze,N. K. Kachakhidze,G. T. Ramishvili
Natural Hazards and Earth System Sciences (NHESS) & Discussions (NHESSD) , 2012, DOI: 10.5194/nhess-12-1009-2012
Abstract: The present paper deals with an attempt to check the theoretical model of self-generated seismo-electromagnetic oscillations of LAI system on the basis of retrospective data. Application of the offered simple model enables one to explain qualitatively the mechanism of VLF electromagnetic emission initiated in the process of an earthquake preparation. Besides, the model enables us to associate telluric character geoelectric and geomagnetic perturbations incited by rock polarization and self-generated electromagnetic oscillations of lithosphere-atmosphere system. L'Aquila earthquake taken as an example to isolate reliably the Earth VLF emission from the magnetospheric electromagnetic emission of the same frequency range, MHD criterion is offered together with geomagnetic activity indexes. On the basis of the considered three earthquakes, according to the opinion of authors the model of self-generated seismo-electromagnetic oscillations of the LAI system will enable us to approach the problem of resolution of earthquake prediction with certain accuracy.
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