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Search Results: 1 - 10 of 148661 matches for " Boris F. Chadov "
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Conditional Mutations in Drosophila: Concept of Genes That Control Individual Development  [PDF]
Boris F. Chadov, Eugenia V. Chadova, Nina B. Fedorova
Advances in Bioscience and Biotechnology (ABB) , 2018, DOI: 10.4236/abb.2018.96017
Abstract:

The conditional mutations in D. melanogaster are produced by gamma-irradiation, maintained in laboratory cultures, and inherited as gene mutations. However, their manifestation differs from the conventional mutations by several specific features. The most noticeable specific feature is their conditional nature, i.e., a conditional mutation manifests itself in the individuals of a certain genotype being silent in the individuals with another genotype. A particular procedure for mutation recovery determines what these genotypes will be. An overwhelming number of mutations are conditional dominant lethals. The viable mutation carriers display a drastically decreased fertility. Early zygotic lethality is inherited according to parental type (maternal or paternal). The carriers of conditional mutations give the offspring with a high rate of monstrosities. The possibility for the offspring to form monstrosities is inherited according to a parental (maternal or paternal) type. The level of fertility of conditional mutants is altered by chromosomal rearrangements. The chromosomal rearrangements themselves cause a decrease in fertility. Lethality of the progenies produced by the parents carrying rearrangements is inherited according to a parental (maternal or paternal) type. The results allow for a set of logical arguments in favor of that 1) the genome has a specialized system of genes (ontogenes) that control the course of individual development; 2) unlike a classical gene, acting according to the scheme DNA à RNA à protein, the ontogene implements the

Large resistivity change and phase transition in LiMnAs
A. Beleanu,J. Kiss,G. Kreiner,C. K?hler,L. Müchler,W. Schnelle,U. Burkhardt,S. Chadov,S. Medvediev,D. Ebke,G. Cordier,B. Albert,A. Hoser,F. Bernardi,T. I. Larkin,D. Pr?pper,A. V. Boris,B. Keimer,C. Felser
Physics , 2013,
Abstract: Antiferromagnetic semiconductors are new alternative materials for spintronic applications and spin valves. In this work, we report a detailed investigation of two antiferromagnetic semiconductors AMnAs (A = Li, LaO), which are isostructural to the well-known LiFeAs and LaOFeAs superconductors. Here we present a comparison between the structural, magnetic, and electronic properties of LiMnAs, LaOMnAs and related materials. Interestingly, both LiMnAs and LaOMnAs show a variation in resistivity with more than five orders of magnitude, making them particularly suitable for use in future electronic devices. From neutron and X-ray diffraction measurements on LiMnAs we have observed a magnetic phase transition corresponding to the Neel temperature of 373.8 K, and a structural transition from the tetragonal to the cubic phase at 768 K. These experimental results are supported by density functional theory (DFT) calculations.
Influence of antiferromagnetic fluctuations on the pressure dependence of the critical temperature in FeSe
S. Chadov,F. Casper,S. Naghavi,C. Felser
Physics , 2009,
Abstract: This paper has been withdrawn, due a wrong analysis of the obtained results.
Personalidad y creación en I. M. Lotman
Boris F. Egorov
Entretextos : Revista Electronica Semestral de Estudios Semióticos de la Cultura , 2007,
Abstract:
New possibilities for supersymmetry breakdown in quantum mechanics and second order irreducible Darboux transformations
Boris F. Samsonov
Physics , 1999, DOI: 10.1016/S0375-9601(99)00736-7
Abstract: New types of irreducible second order Darboux transformations for the one dimensional Schroedinger equation are described. The main feature of such transformations is that the transformation functions have the eigenvalues grater then the ground state energy of the initial (or reference) Hamiltonian. When such a transformation is presented as a chain of two first order transformations, an intermediate potential is singular and therefore intermediate Hamiltonian can not be Hermitian while the final potential is regular and the final Hamiltonian is Hermitian. Second derivative supersymmetric quantum mechanical model based on a transformation of this kind exhibits properties inherent to models with exact and broken supersymmetry at once.
Coherent States for Transparent Potentials
Boris F. Samsonov
Physics , 1999, DOI: 10.1088/0305-4470/33/3/312
Abstract: Darboux transformation operators that produce multisoliton potentials are analyzed as operators acting in a Hilbert space. Isometric correspondence between Hilbert spaces of states of a free particle and a particle moving in a soliton potential is established. It is shown that the Darboux transformation operator is unbounded but closed and can not realize an isometric mapping between Hilbert spaces. A quasispectral representation of such an operator in terms of continuum bases is obtained. Different types of coherent states of a multisoliton potential are introduced. Measures that realize the resolution of the identity operator in terms of the projectors on the coherent states vectors are calculated. It is shown that when these states are related with free particle coherent states by a bounded symmetry operator the measure is defined by ordinary functions and in the case of a semibounded symmetry operator the measure is defined by a generalized function.
New features in supersymmetry breakdown in quantum mechanics
Boris F. Samsonov
Physics , 1996, DOI: 10.1142/S0217732396001557
Abstract: The supersymmetric quantum mechanical model based on higher-derivative supercharge operators possessing unbroken supersymmetry and discrete energies below the vacuum state energy is described. As an example harmonic oscillator potential is considered.
Time-dependent parasupersymmetry in quantum mechanics
Boris F. Samsonov
Physics , 1996, DOI: 10.1142/S0217732396002083
Abstract: Parasupersymmetry of the one dimensional time-dependent Schr\"odinger equation is established. It is intimately connected with a chain of the time-dependent Darboux transformations. As an example a parasupersymmetric model of nonrelativistic free particle with threefold degenerate discrete spectrum of an integral of motion is constructed.
Minimum error discrimination problem for pure qubit states
Boris F Samsonov
Physics , 2009, DOI: 10.1103/PhysRevA.80.052305
Abstract: The necessary and sufficient conditions for minimization of the generalized rate error for discriminating among $N$ pure qubit states are reformulated in terms of Bloch vectors representing the states. For the direct optimization problem an algorithmic solution to these conditions is indicated. A solution to the inverse optimization problem is given. General results are widely illustrated by particular cases of equiprobable states and $N=2,3,4$ pure qubit states given with different prior probabilities.
Optimal positive-operator-valued measures for unambiguous state discrimination
Boris F. Samsonov
Physics , 2008, DOI: 10.1103/PhysRevA.79.042312
Abstract: Optimization of the mean efficiency for unambiguous (or error free)discrimination among $N$ given linearly independent nonorthogonal states should be realized in a way to keep the probabilistic quantum mechanical interpretation. This imposes a condition on a certain matrix to be positive semidefinite. We reformulated this condition in such a way that the conditioned optimization problem for the mean efficiency was reduced to finding an unconditioned maximum of a function defined on a unit $N$-sphere for equiprobable states and on an $N$-ellipsoid if the states are given with different probabilities. We established that for equiprobable states a point on the sphere with equal values of Cartesian coordinates, which we call symmetric point, plays a special role. Sufficient conditions for a vector set are formulated for which the mean efficiency for equiprobable states takes its maximal value at the symmetric point. This set, in particular, includes previously studied symmetric states. A subset of symmetric states, for which the optimal measurement corresponds to a POVM requiring a one-dimensional ancilla space is constructed. We presented our constructions of a POVM suitable for the ancilla space dimension varying from 1 till $N$ and the Neumark's extension differing from the existing schemes by the property that it is straightforwardly applicable to the case when it is desirable to present the whole space system + ancilla as the tensor product of a two-dimensional ancilla space and the $N$-dimensional system space.
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