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  • Articles: DFG German National Licenses  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Gas-source molecular-beam epitaxy using Si2H6 and GeH4 and x-ray characterization of Si1−xGex (0≤x≤0.33) alloys (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 4916-4919 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Gas-source molecular-beam epitaxy (MBE) has been used to grow SiGe alloys with Si2H6 and GeH4 as sources on (100) Si substrates. Single-crystalline epilayers with Ge composition as high as 33% have been produced at 610 °C, the lowest temperature hitherto used for gas-source SiGe MBE. Growth parameters, growth modes, and the structural characteristics have been studied by a variety of in situ and ex situ techniques. Double-crystal x-ray diffraction data for the alloys have been obtained for the first time in thin mismatched layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350639
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Auxin-induced delay of abscission: The involvement of calcium ions and protein phosphorylation in bean explants (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 73 (1988), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Treatment with Ca2+ channel blockers such as lanthanum chloride and verapamil promoted abscission in pulvinar explants of bean (Phaseolus vulgaris L. ev. Pirate). In addition, auxin-induced delay of abscission was markedly reduced in the presence of Ca2+ channel blockers. In vitro phosphorylation studies were performed using membrane preparations (130000 g pellet) from freshly excised as well as auxintreated and control (minus auxin) pulvinar sections. Auxin-treated sections showed a 66 kDa phosphoprotein as well as Ca2+ -dependent phosphorylation that were not observed in control explants.Coomassie blue stammg of soluble proteins (130000 g supernatent) separated on SDS-PAGE revealed the presence of 62. 55 and 47 kDa polypeptides only in the freshly excised pulvini. However. no distinct changes were observed in soluble protein profile between auxin-treated and control explants. When soluble proteins were phosphorylated in vitro, Ca2+ promoted the phosphorylation of 92, 55. 40 and I7 kDa polypeptides only in freshly excised pulvmi. Ca2+-dependent phosphorylation of soluble proteins was not observed in either the control or auxin-treated explants. In addition. in vivo phosphorylation studies were performed using freshly excised. auxrn-treated and control explants. Freshly excused segments and auxin-treated ex-plants showed similar phosphoproteins, which were different from those observed mcontrol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1988.tb00610.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Coherent and incoherent dynamics of excitons in semiconductor microcavities (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 1295-1303 
    Details
    ISSN: 0392-6737
    Keywords: Polaritons (including photon-phonon and photon-magnon interactions) ; Excitons and related phenomena (including electron-hole drops) ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We have investigated the dynamics of impulsively excited planar microcavities in the strongly couple regime. With resonant, coherent excitation, the emitted light shows vacuum-Rabi oscillations and a lifetime corresponding to twice the cavity lifetime. As the light intensity is increased, the exciton bleaching leads to reduced normal-mode splitting. The role of interface disorder on the dynamic splitting is discussed. Coherence transfer in exciton-exciton scattering is observed. Off-resonant excitation leads to long lifetimes limited by scattering into the radiatively coupled states of the exciton-cavity system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457201
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    Paper (German National Licenses)
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