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  • 1
    Electronic Resource
    Electronic Resource
    Transmission electron microscopy study of defects in Sn-doped GaAs films grown by molecular beam epitaxy (1987)
    Springer
    Applied physics 44 (1987), S. 143-151 
    Details
    ISSN: 1432-0630
    Keywords: 68.55Jh ; 81.30Fb ; 68.35
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Films of GaAs, heavily doped with Sn, which have been grown by molecular-beam epitaxy are found to contain single-crystal Sn particles situated in the nearsurface region of the epilayer GaAs. The morphology and chemical composition of the particles have been examined by using cross-section transmission electron microscopy combined with energy-dispersive x-ray spectroscopy. Different growth conditions were used to study the Sn-particle formation and high-resolution transmission electron microscopy was used to investigate microstructures. The observations are discussed in terms of several models previously proposed for these phenomena.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00626415
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The effects of 5,7-dihydroxytryptamine lesions of extrapyramidal and mesolimbic sites on spontaneous motor behaviour, and amphetamine-induced stereotypy (1979)
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 308 (1979), S. 51-54 
    Details
    ISSN: 1432-1912
    Keywords: Dopamine ; 5-Hydroxytryptamine ; Activity ; Stereotypy ; Amphetamine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary 5,7-Dihydroxytryptamine lesions of the nucleus accumbens septi, or substantia nigra, resulted in a twofold increase in spontaneous locomotor activity. Striatal 5HT depletion also raised basal activity levels, as well as increasing rearing behaviour in an open field. The stereotyped responses to all doses of amphetamine tested (2.5–10 mg/kg, i.p.) were enhanced by lesions of the nucleus accumbens or substantia nigra. Striatal lesions only affected the response to the lowest dose of amphetamine. Lesions of the tuberculum olfactorium were without effect on spontaneous or amphetamine induced responses. The results support the concept of a modulatory 5HT influence on nigro-striatal function, and suggest that 5HT in the nucleus accumbens has an antagonistic role with respect to dopamine function in this site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00499718
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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