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  • 1
    Electronic Resource
    Electronic Resource
    Ossification of the posterior cervical longitudinal ligament (1992)
    Springer
    Acta neurochirurgica 115 (1992), S. 15-19 
    Details
    ISSN: 0942-0940
    Keywords: OPLL ; subtotal vertebrectomy ; decompression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Forty patients with cervical myelopathy due to OPLL (Ossification of the Posterior Longitudinal Ligament) of the cervical spine were studied. According to Abe's or Yamamoto's classification, 12 of them had a 50% decrease in the cross-sectional area of the spinal canal. Subtotal vertebrectomy was carried out in 8 of these patients and the remaining 4 patients received posterior decompression. We concluded that anterior decompression, if possible, is the treatment of choice and posterior decompression is recommended only for the longitudinal type involving more than 3 segments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01400585
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  • 2
    Electronic Resource
    Electronic Resource
    Erratum (1992)
    Springer
    Acta neurochirurgica 115 (1992), S. 165-165 
    Details
    ISSN: 0942-0940
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01406379
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  • 3
    Electronic Resource
    Electronic Resource
    The transition from nonadiabatic to solvent controlled adiabatic electron transfer: Solvent dynamical effects in the inverted regime (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 281-292 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We analyze the effect of dynamical solvent effects on the rate of a nonadiabatic electron transfer (ET) reaction. Starting from a Hamiltonian for a reaction coordinate for motion along the potential surfaces of donor and acceptor species, and a bath representing the solvent dynamical effects, we obtain a system of four coupled reduced equations of motion for the elements of the density matrix of the donor/acceptor system. In this derivation the dynamics along the reaction coordinate are reduced to a classical Fokker–Planck operator since we assume the temperature is high compared with bath frequencies. At temperatures where the nuclear motion describing the transition between the surfaces can be treated classically we show that the ET processes may be viewed as a consecutive reaction scheme with rate constant k=kNA kD/(kD+kNA), the steps are diffusion along the reaction coordinate with rate constant kD followed by crossing between the donor and acceptor surfaces at the point of intersection of the surfaces with rate constant kNA. kNA is given by an activated rate expression and is independent of solvent dynamics, e.g., a dielectric relaxation time. When the nuclear motion must be treated quantum mechanically, as is favored in the inverted regime (where the surfaces have slopes of the same sign at their crossing point), the transition between the surfaces is no longer confined to their crossing point. We obtain an approximate expression of the above form where kNA incorporates the width of the transition. Then kNA depends on solvent dynamics. When the separation into diffusive and crossing motion is no longer appropriate, we use a basis set expansion method to directly solve the four coupled density matrix equations to obtain k. These results are compared with the approximate formula given above.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457514
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  • 4
    Electronic Resource
    Electronic Resource
    Solvent dynamical effects on nonadiabatic electron transfer reactions at low temperature (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 5711-5719 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The role of solvent dynamics on low temperature nonadiabatic electron transfer reactions is explored. The solvent degrees of freedom orthogonal to the nuclear motion reaction coordinate are represented by a frictional term. Thus, motion along the reaction coordinate is described by a damped quantum oscillator equation of motion. This equation of motion is used to construct the nonadiabatic electron transfer rate constant which describes long range electron transfer phenomena such as occurs in biological oxidation-reduction reactions. The frictional dynamics are correctly described even for temperatures lower than the characteristic frequencies of the reaction coordinate and the friction. We exhibit the effects that friction can have on the electron transfer rate from room temperature down to 4 K, and qualitatively compare with typical biological electron transfer data, as interpreted using the conventional zero friction theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456427
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  • 5
    Electronic Resource
    Electronic Resource
    Concentration dependent fluorescence quenching with ionic reactants (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 2833-2838 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A calculation of the quencher concentration dependence of the fluorescence quenching lifetime τ of a fluorophore is presented. The fluorophore and quenchers are assumed to be charged. An effective medium theory, which leads to deviations from linear Stern–Volmer behavior, is solved by numerical methods, when the ions interact by Coulomb's law. For oppositely charged ions, whose contact reaction rate is not too fast, a regime can be reached where 1/τ appears to return to linear Stern–Volmer behavior with slope determined by this contact reaction rate. A second quenching scheme is introduced, which is often invoked in studies of electron transfer reactions, and analyzed by related techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452033
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  • 6
    Electronic Resource
    Electronic Resource
    A colorimetric method for the estimation of 2-deoxy-3-C-methyl-branched sugars
    Amsterdam : Elsevier
    Carbohydrate Research 189 (1989), S. 368-373 
    Details
    ISSN: 0008-6215
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0008-6215(89)84114-X
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  • 7
    Electronic Resource
    Electronic Resource
    T"2-AlLiCu structure and its phase transition under heat treatment
    Amsterdam : Elsevier
    Solid State Communications 63 (1987), S. 951-954 
    Details
    ISSN: 0038-1098
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0038-1098(87)90637-5
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  • 8
    Electronic Resource
    Electronic Resource
    Mechanistic studies on DNA photolyase VIII: Studies on the fragmentation of the radical anion and cation of a uracil-alkene photoadduct
    Amsterdam : Elsevier
    Tetrahedron Letters 34 (1993), S. 1709-1712 
    Details
    ISSN: 0040-4039
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0040-4039(00)60758-X
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  • 9
    Electronic Resource
    Electronic Resource
    Modulated structure of the superconducting compounds Bi2Sr2Ca n-1Cu n O y withn=1 and 2 (1989)
    Springer
    The European physical journal 74 (1989), S. 165-172 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The incommensurate modulated structures of high-T c superconducting phases Bi2Sr2Ca n−1Cu n O y (n=1 and 2) have been studied using symmetry properties of four-dimensional super-spacegroups and electron diffraction as well as high resolution electron microscopy are used to describe the properties of the incommensurate modulated structure in the compounds. The main results are planar monoclinic symmetryP B 2/b 11 orP B b 1 for Bi2Sr2CuO y (n=1) and orthorhombic symmetryN 111 Bbmb orN 111 Bb2b for Bi2Sr2CaCu2O y (n=2). The temperature dependence of the modulated structure of Bi2Sr2CaCu2O y has been investigated from −190°C to 800°C. Some structure properties of Bi2Sr2Ca2Cu3O y (n=3) are presented for comparison.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01307382
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  • 10
    Electronic Resource
    Electronic Resource
    Finite element analysis of transient fluid flow with free surface using VOF (volume-of-fluid) method and adaptive grid (1998)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 26 (1998), S. 1127-1154 
    Details
    ISSN: 0271-2091
    Keywords: free surface ; transient viscous incompressible fluid ; finite element method ; VOF (volume-of-fluid) method ; adaptive grid ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The VOF method is adopted for the finite element analysis of transient fluid flow with a free surface. In particular, an adaptation technique for generating an adaptive grid is incorporated to capture a higher resolution of the free surface configuration. An adaptive grid is created through the refinement and mergence of elements. In this domain the elements in the surface region are made finer than those in the remaining regions for more efficient computation. Also, three techniques based on the VOF method are newly developed to increase the accuracy of the analysis, namely the filling pattern, advection treatment and free surface smoothing techniques. Using the proposed numerical techniques, radial flow with a point source and the collapse of a dam are analysed. The numerical results agree well with the theoretical solutions as well as with the experimental results. Through comparisons with the numerical results of several cases using different grids, the efficiency of the proposed technique is verified. © 1998 by John Wiley & Sons, Ltd.
    Additional Material: 28 Ill.
    Type of Medium: Electronic Resource
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