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  • 1
    Electronic Resource
    Electronic Resource
    Microsatellite polymorphisms reveal phylogenetic relationships in primates (1995)
    Springer
    Journal of molecular evolution 41 (1995), S. 10-14 
    Details
    ISSN: 1432-1432
    Keywords: Microsatellite ; DNA polymorphism ; Primate phylogeny ; DNA sequencing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We amplified, via PCR, DNA segments from intron 1 of the tyrosine hydroxylase gene (TH01) and intron 40 of the von Willebrand factor gene (VWA) in ten nonhuman primate genera. In humans both introns contain polymorphic microsatellites with tetrameric repeats. Compared to the allelic ranges in human populations relatively short repeat arrays could be detected for the nonhuman primates typed, presumably reflecting an ancient precursor state at both microsatellite loci. Furthermore, our results provide evidence for an association of the average number of repeats present in different primate genera and their divergence time from man. DNA sequencing of VWA orthologues revealed a relatively high variability in the arrangement of repeats in the 5′-repeat arrays, the generation of which could probably be explained by polar mutational events.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00174036
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Erratum: "Effect of a magnetic flux line on the quantum beats in the Hénon–Heiles level density'' [Chaos 5, 317 (1995)] (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Chaos 5 (1995), S. 707-708 
    Details
    ISSN: 1089-7682
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.166146
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of a magnetic flux line on the quantum beats in the Hénon–Heiles level density (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Chaos 5 (1995), S. 317-329 
    Details
    ISSN: 1089-7682
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The quantum density of states of the Hénon–Heiles potential displays a pronounced beating pattern. This has been explained by the interference of three isolated classical periodic orbits with nearby actions and periods. A singular magnetic flux line, passing through the origin, drastically alters the beats even though the classical Lagrangian equations of motion remain unchanged. Some of the changes can be easily understood in terms of the Aharonov–Bohm effect. However, we find that the standard periodic orbit theory does not reproduce the diffraction-like quantum effects on those classical orbits which intersect the singular flux line, and argue that corrections of relative order (h-dash-bar) are necessary to describe these effects. We also discuss the changes in the distribution of nearest-neighbor spacings in the eigenvalue spectrum, brought about by the flux line. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.166080
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  • 4
    Electronic Resource
    Electronic Resource
    Shells and periodic orbits in fermion systems (1998)
    Springer
    Czechoslovak journal of physics 48 (1998), S. 845-852 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We provide a semiclassical description of the shell structure in large prolate cavities. Level densities and shell-correction energies are obtained from periodic orbit theory, using a version of Gutzwiller's trace formula that takes into account continuous symmetries. The semiclassical results are compared with their quantum-mechanical counterparts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021455520508
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  • 5
    Electronic Resource
    Electronic Resource
    Triaxial shapes of sodium clusters (1995)
    Springer
    The European physical journal 34 (1995), S. 125-134 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 35.20.Wg ; 71.45.Nt
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A modified Nilsson-Clemenger model is combined with Strutinsky's shell correction method. For spherical clusters, the model potential is fitted to the single-particle spectra obtained from selfconsistent Kohn-Sham calculations. The deformation energy surfaces of sodium clusters with sizes of up toN=270 atoms are calculated for a combination of triaxial, quadrupole and hexadecapole deformations. The ground state shapes and energies are determined by simultaneous minimization with respect to the three shape parameters. A significant fraction of the clusters is predicted to be triaxial. The deviations from the axial shape do not generate any systematic odd-even staggering of the binding energies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01439387
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  • 6
    Electronic Resource
    Electronic Resource
    Structure and optic response of the Na9 + and Na55 + clusters (1999)
    Springer
    The European physical journal 9 (1999), S. 149-152 
    Details
    ISSN: 1434-6079
    Keywords: PACS: 36.40.-c Atomic and molecular clusters – 31.15.-p Calculations and mathematical techniques in atomic and molecular physics – 71.15.-m Methods of electronic structure calculations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We present the ionic geometries of Na9 + and Na55 + clusters obtained in the “cylindrically averaged pseudopotential scheme”. Our structures are tested by calculating photoabsorption spectra and comparing them to the experimentally measured ones. We employ a local pseudopotential that has been constructed to reproduce atomic and bulk properties of sodium. Comparing the results using different pseudopotentials, we find that the position of the dipole resonance is greatly influenced by details of the pseudopotentials, showing that these must be used consistently both in the geometry optimization and the calculation of the optic response.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530050416
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  • 7
    Electronic Resource
    Electronic Resource
    Frequencies, times, and forces in the dynamics of Na clusters (1999)
    Springer
    The European physical journal 9 (1999), S. 111-117 
    Details
    ISSN: 1434-6079
    Keywords: PACS: 36.40.-c Atomic and molecular clusters – 36.40.Gk Plasma and collective effects in clusters – 71.24.+q Electronic structure of clusters and nanoparticles – 72.20.Ht High field and nonlinear effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Laser excitation of metal clusters depends on various parameters such as frequency, intensity, and pulse time. We give here an overview of relevant time scales and forces for the example of Na clusters. Variation of laser intensity is studied in connection with second harmonic generation. We see a rather sudden transition from a perturbative regime at low intensities to a field-dominated regime for larger intensities. We use the non-linearized time-dependent local density approximation (TDLDA), together with a local pseudopotential for the interaction of the valence electrons with the ions. Explicit ionic motion is taken into account in one test case where we demonstrate the importance of ionic effects for the detailed time evolution at times larger than 100 fs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530050408
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