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  • 1
    Electronic Resource
    Electronic Resource
    Polyparaphenylene under pressure: Optical absorption and vibrational modes (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 1930-1934 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Optical absorption, Raman, and infrared (IR) spectra of undoped polyparaphenylene (PPP) have been studied under pressure up to 20 GPa at 300 K. PPP shows stable behavior, in marked contrast to the reactivity observed in trans-polyacetylene under pressure. The absorption edge of PPP shifts to lower energy with a total shift of 0.55 eV at 20 GPa. Raman spectra reveal a new band at about 820 cm−1 which becomes active above ∼5 GPa. At high pressure we find a considerable broadening of the infrared-active out-of-plane mode at 805 cm−1. The results are in part interpreted in terms of the larger interchain coupling induced by pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456035
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  • 2
    Electronic Resource
    Electronic Resource
    Flag-transitive projective planes (1985)
    Springer
    Geometriae dedicata 17 (1985), S. 219-226 
    Details
    ISSN: 1572-9168
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00181588
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  • 3
    Electronic Resource
    Electronic Resource
    Experimental electronic structure studies of La2−x Sr x CuO4 (1987)
    Springer
    The European physical journal 67 (1987), S. 9-14 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract X-ray induced photoelectron spectroscopy, bremsstrahlung-isochromat spectroscopy, and electron energy-loss spectroscopy were used to investigate the electronic structure of the high-temperature superconductor La2−x Sr x CuO4. In general, good agreement was obtained with band structure calculations of the tetragonal phase of La2CuO4. Near the Fermi energyE F the systems shows forx=0 a smeared out gap or a region of very low density of states ∼2eV wide. Upon replacement of La by Sr, the gap is filled with defect states, the intensity of which is proportional tox. The experimental data are not consistent with the closing of a Peierls gap alone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01307300
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  • 4
    Electronic Resource
    Electronic Resource
    Calcium ions and polyamines activate the plasma membrane-located 1,3-β-glucan synthase (1987)
    Springer
    Planta 171 (1987), S. 130-135 
    Details
    ISSN: 1432-2048
    Keywords: Calcium (enzyme activation) ; 1,3-β-Glucan synthase ; Glycine (glucan synthase activation) ; Plasma membrane ; Polyamine ; Polycation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Sucrose-density-gradient centrifugation and partitioning in a polyethylene glycol/dextran two-phase system were used to isolate plasmamembrane vesicles from microsomal preparations of soybean cell suspension cultures. Both methods resulted in the enrichment of the activity of a 1,3-β-glucan synthase which forms a polymer consisting of more than 99% of 1,3-linked glucose (callose). Digitonin increases the 1,3-β-glucan synthase activity in the various membrane fractions to a different degree, supporting the suggestion that this enzyme is vectorially arranged in the plasma membrane. The enzyme is greatly activated either by poly-l-ornithine or synergistically by Ca2+ and spermine, indicating that the same enzyme is affected and exhibits the regulatory properties necessary for callose synthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00395076
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  • 5
    Electronic Resource
    Electronic Resource
    Partial purification and immunological characterization of 1,3-β-glucan synthase from suspension cells of Glycine max (1990)
    Springer
    Planta 181 (1990), S. 343-348 
    Details
    ISSN: 1432-2048
    Keywords: Callose ; Cell culture (1,3-β-glucan synthase) ; Digitonin-1,3-β-Glucan synthase (purification, immunology) ; Glycine (1,3-β-glucan synthase)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The plasma-membrane-localized 1,3-β-glucan synthase (EC 2.4.1.34) from suspension cultures of Glycine max (L.) Merr. was greatly enriched by a three-step purification procedure. Starting with a microsomal preparation, a six- to eightfold enrichment of the enzyme was achieved by isolating plasma-membrane vesicles in a polyethyleneglycol/dextran two-phase system. The enzyme was solubilized with the nonionic detergent digitonin and further purified 12-fold by successive centrifugations on two linear sucrose density gradients. The most purified enzyme preparation showed enrichment in a 31-kilodalton (kDa) polypeptide and was used to raise polyspecific antibodies which precipitated 1,3-β-glucan synthase activity. These antibodies were purified by affinity chromatography against immobilized membrane protein fractions of lower molecular weight which were devoid of 1,3-β-glucan synthase activity. The purified antibodies specifically labelled a single polypeptide of 31 kDa in the 1,3-β-glucan-synthase-containing heavy fractions of the first sucrose gradient indicating that this polypeptide represents part of the active enzyme complex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00195886
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  • 6
    Electronic Resource
    Electronic Resource
    Electronic structure and Fermi surface of Bi2Sr2CaCu2O8 (1990)
    Springer
    The European physical journal 80 (1990), S. 181-185 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Applying angle-resolved photoemission spectroscopy of high angular and energy resolution we have measured the electronic structure of single crystals of Bi2Sr2CaCu2O8 near the Fermi energy. Along the high symmetry direction ΓX a band is observed to disperse upwards and to cross the Fermi level, whose unoccupied part constitutes the hole-like carriers responsible for the superconductivity. From spectra along the Γ M direction we find evidence for an electron pocket around the M point. The measured band widths appear to be drastically reduced compared with band structure calculations indicating strong electronic correlation effects. From the observation of Fermi-Dirac-like cut-offs in the spectra due to band crossings through the Fermi level we can confirm the existence and, in particular, the shape of the Fermi surface as calculated by band structure calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01357500
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  • 7
    Electronic Resource
    Electronic Resource
    Resonant photoemission study ofK-derived valence-band states in K X C60 (1993)
    Springer
    The European physical journal 92 (1993), S. 347-351 
    Details
    ISSN: 1434-6036
    Keywords: 36.40.+d ; 74.75.+t ; 79.60.−i
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The electronic structure of K-doped C60 was investigated by photoemission (PE) and X-ray absorption near-edge structure (XANES) studies at the C-1s and K-2p thresholds. In addition, information on the local K-derived partial density of states in superconducting K3C60 was obtained by resonant PE at the K-2p 1/2 threshold. The experimental observations support a complete charge transfer from K to C60 and we clearly observe a finite density of states atE F . From resonant PE, occupied states with K-p, d character could be identified in the binding-energy region from 1.5 to 8 eV below, but not directly at the Fermi level. This partial-density-of-states structure agrees well with the results of our band-structure calculations based on the local-density approximation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01308753
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  • 8
    Electronic Resource
    Electronic Resource
    Crystal and electronic structure of solid C76 (1994)
    Springer
    The European physical journal 95 (1994), S. 469-474 
    Details
    ISSN: 1434-6036
    Keywords: 79.20.Kz ; 61.46.+w ; 61.16.Bg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The crystal and electronic structure of solidC 76 has been studied using transmission electron microscopy and electron energy-loss spectroscopy in transmission. C76 forms a close packed structure with an average facecentred cubic symmetry. From valence band and core electron excitations information on the dielectric function and the unoccupied density of states has been obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313354
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  • 9
    Electronic Resource
    Electronic Resource
    Dielectric function of YBa2Cu3O7-δ between 50 meV and 50 eV (1990)
    Springer
    The European physical journal 78 (1990), S. 367-380 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Electronic excitations with polarization parallel to the CuO2-planes in single-crystalline YBa2Cu3O7 and YBa2Cu3O6 have been investigated by optical reflectance and by highenergy electron energy-loss spectroscopy in transmission in the energy ranges from 50 meV to 6 eV and 0.2 eV to 150 eV, respectively. From a combination of these experimental data the dielectric function, the reflectivity and the optical conductivity have been obtained in a wide energy range. The observed spectra are interpreted in terms of optical phonons, free-carrier absorption, transitions across the charge-transfer gap, further interband transitions, low-lying core-level excitations, excitonic transitions and valence conservingd-d transitions within the Cu 3d shell combined with O 2p intraband transitions. The charge carrier plasmon and the 4 eV-excitation in YBa2Cu3O6 show quadratic dispersions in momentum transfer. From the dispersion constant of the plasmon a mean value of the Fermi velocity of the charge carriers parallel to the CuO2 planes has been derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313317
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  • 10
    Electronic Resource
    Electronic Resource
    Electron energy-loss spectroscopy studies on C60 and C70 fullerite (1992)
    Springer
    The European physical journal 86 (1992), S. 87-92 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The electronic structure of the crystalline fullerites C60 and C70 has been investigated by high-energy electron energy-loss spectroscopy in transmission. From valence band excitations and from core-level excitations of the C 1s level information on occupied and unoccupied π and ϖ bands has been obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01323552
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