Search Results - (Author, Cooperation:I. Tikhonova)

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  1. 1
    Staff View
    Publication Date:
    2016-01-20
    Publisher:
    American Association for the Advancement of Science (AAAS)
    Print ISSN:
    0036-8075
    Electronic ISSN:
    1095-9203
    Topics:
    Biology
    Chemistry and Pharmacology
    Computer Science
    Medicine
    Natural Sciences in General
    Physics
    Keywords:
    Brain/abnormalities/metabolism ; Child ; Congenital Abnormalities/genetics ; Exome/genetics ; Heart Defects, Congenital/*diagnosis/*genetics ; Humans ; Mutation ; Nervous System Malformations/*genetics ; Neurogenesis/*genetics ; Prognosis ; RNA Splicing/genetics ; RNA, Messenger/genetics ; RNA-Binding Proteins/genetics ; Repressor Proteins/genetics ; Transcription, Genetic
    Published by:
    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Staff View
    ISSN:
    1573-9171
    Keywords:
    polymercury-containing macrocycles ; halide anions ; complexes ; MNDO method ; generalized chemical bond
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Notes:
    Abstract Geometries and electronic structures of the complexes of halide anions with cyclic trimerico-phenylenemercury, (o-C6H4Hg)3, perfluoro-o-phenylenemercury, (o-C6F4Hg)3, vinylenemercury, (C2H2Hg)3, and perfluorovinylenemercury, (C2F2Hg)3, were modelled by the MNDO method. Calculations were performed for [L-X]− semisandwich complexes, [X-L-X]2− bipyramidal complexes, and [L-X-L]− sandwich complexes (where X=Hal,L is a mercury-containing macrocycle). Based on the results of calculations, we concluded that it was advantageous to describe the chemical bonding between halide anions and mercury-containing macrocycles in terms of generalized chemical bonds, which were successfully used for π-complexes of transition metals. In the [L-X]− semisandwich complexes, the halide anion and the metallacycle are involved in the formation of three generalized chemical bonds: one headlight-shaped σ-bond and two two-lobe π-bonds. In the [X-L-X]2− bipyramidal complexes, each halide anion forms three generalized chemical bonds with the macrocycle. It is possible because the macrocycleL has unoccupied molecular orbitals suitable for the formation of such bonds; these MOs consist mainly of the orbitals of mercury atoms directed toward both the upper and lower halogen atoms. In the [L-X-L]− sandwich complexes, the halide anion cannot be bonded to each ringvia three bonds, and, hence, an unsymmetrical structure is formed, in which the rings are located at different distances from the central atom: the [L-X]− semisandwich complex solvated by macrocycleL.
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  3. 3
    Staff View
    ISSN:
    1573-9171
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  4. 4
    Staff View
    ISSN:
    1573-9171
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  5. 5
    Staff View
    ISSN:
    1573-9171
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  6. 6
    Staff View
    ISSN:
    1573-8973
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes:
    Abstract The changes in the clearances (interferences) caused by the differences in the temperature coefficients of linear expansion (TCLE) of joined materials are considered. In operation and long-term storage of precision parts made of high-strength steels these changes can exceed the admissible ranges due to the instability of the phase composition even when the parameters of the heat-treatment process correspond to the existing technological recommendations. A study of the nature of the size instability of high-strength corrosion-resistant steel 25Kh17N2B-Sh allowed the authors to recommend regimes for its final heat treatment that provide maximum size stability at the specified level of mechanical properties.
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  7. 7
    Staff View
    ISSN:
    1573-8973
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes:
    Conclusions 1. The probabilistic models obtained have a high predictive ability and they adequately describe the variations in the properties of the alloy V96Ts1 under two-stage aging. 2. A high dimensional stability of the V96Ts1 alloy is attained only upon two-stage aging with correct choice of the temperature—time parameters of the first stage, which secure the maximum degree of decomposition of saturated solid solution in the stage of the zone aging.
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  8. 8
    Pushkar, A. ; Golovin, S. A. ; Tikhonova, I. V.
    Springer
    Published 1981
    Staff View
    ISSN:
    1573-9325
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  9. 9
    Rusin, N. M. ; Savitskii, A. P. ; Tikhonova, I. N.
    Springer
    Published 1994
    Staff View
    ISSN:
    1573-9066
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes:
    Abstract The sintering of aluminum with substantial additions of nickel was investigated. It was determined that within the temperature range (700–750°C) and concentration range (10–17.5 at. % Ni) it was possible by the sintering of pressed powder compacts to obtain alloys with densities approaching the theoretical. The hardness and tensile strength of the alloys increased and the ductility decreased with increasing nickel concentration and increasing temperature. The curves of yield, tensile strength, and ductility vs nickel concentration exhibited maxima.
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  10. 10
    Staff View
    ISSN:
    1573-9066
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  11. 11
    Tikhonova, I. A. ; Shur, V. B. ; Vol'pin, M. E.
    Springer
    Published 1976
    Staff View
    ISSN:
    1573-9171
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  12. 12
    Shur, V. B. ; Tikhonova, I. A. ; Vol'pin, M. E.
    Springer
    Published 1972
    Staff View
    ISSN:
    1573-9171
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  13. 13
    Shur, V. B. ; Tikhonova, I. A. ; Vol'pin, M. E.
    Springer
    Published 1988
    Staff View
    ISSN:
    1573-9171
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  14. 14
    Staff View
    ISSN:
    1573-9171
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  15. 15
    Staff View
    ISSN:
    1573-9171
    Keywords:
    polymercury-containing macrocycles ; halide anions ; complexes ; MNDO method ; generalized chemical bonds
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Notes:
    Abstract Molecular and electronic structures of complexes of halide anions with cyclic pentameric difluoromethylidenemercury [CF2Hg]5 have been studied by the MNDO method. Calculations have been performed for [L-X]− halfsandwich complexes and bipyramidal complexes [X-L-X]2− having a shape of a spinning top (L is the mercury-containing macrocycle; X = F, Cl, Br, or 1). It has been shown that in complexes of both types, halide anions are bonded to the mercury-containing macrocycle via three generalized chemical bonds: one headlightshaped σ-bond and two two-lobe n-bonds. The complexes studied have been compared with the analogous complexes of the macrocycles containing three mercury atoms. The similarity and differences in the character of the generalized chemical bonds in relation to the size of the cycle have been considered.
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses