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  • 1
    Electronic Resource
    Electronic Resource
    Interstitial and substitutional Zn in InP and InGaAsP (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 553-560 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Closed-ampoule Zn diffusion in InP results in a net acceptor concentration that is much smaller than the Zn concentration. After subsequent annealing of InP in an atmosphere without Zn, the Zn and net acceptor concentrations have become almost identical, due to a decreased Zn concentration and an increased net acceptor concentration. The annealing treatment gives rise to a decreased contact resistivity. The diffusion depth has not changed. Annealing with a SiN cap on the InP surface does not have this effect on the concentrations. These annealing effects also take place in InGaAsP on InP layers. The results can be explained quantitatively by assuming that Zn is incorporated as both substitutional acceptors and interstitial donors and that only the interstitial Zn is driven out by the annealing, owing to its large diffusion coefficient. Profiles calculated with this interstitial-substitutional model can be fitted to experimental profiles assuming Zn to diffuse as singly ionized interstitial donors. This model can also describe earlier reported results on Zn diffusion in n-type InP for which a profile cutoff is found at a depth where the acceptor concentration equals the background donor concentration and in which the acceptor solubility is higher than in undoped InP.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343140
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Myelin changes in leprous neuropathy (1987)
    Springer
    Acta neuropathologica 74 (1987), S. 75-80 
    Details
    ISSN: 1432-0533
    Keywords: Leprosy neuropathy ; Peripheral nerve ; Myelin ; Myelin periodicity ; Artefact
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Myelin changes were observed in fibres of nerves from cases of leprosy. The myelin had a ‘loosened’ appearance caused by increased and irregular separation of the intraperiod line. ‘Loosening’ might affect all, or only some, of the lamellae forming a myelin sheath. There was a pathcy distribution of fibres with abnormal myelin, and they were seen only in nerves showing other marked pathological changes including the presence of oedema. The appearances are suggestive of intramyelinic oedema which may be related to the presence of endoneurial oedema.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00688341
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Cytomembranous inclusions in the peripheral nerves in AIDS (1989)
    Springer
    Acta neuropathologica 79 (1989), S. 336-339 
    Details
    ISSN: 1432-0533
    Keywords: AIDS ; Cytomembranous inclusions ; Tubuloreticular inclusions ; Ultrastructure ; Peripheral nerve
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We report finding tubuloreticular inclusions (TRI) in the endothelial cells of endo- and epineurial vessels in the sural nerve of 11 patients with AIDS. Six patients had a painful peripheral neuropathy, one a non-painful sensory neuropathy, one an acute inflammatory demyelinating polyradiculoneuropathy and one a thalidomide-related neuropathy. Two patients had no clinical evidence of neuropathy. The TRI are not specific to one neuropathy and are unlikely to contribute to the pathogenesis of peripheral nerve syndromes in AIDS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294672
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  • 4
    Electronic Resource
    Electronic Resource
    Chronic demyelination in mouse peripheral nerve produced by lysophosphatidyl choline and X-irradiation: ultrastructural observations (1986)
    Springer
    Journal of neurocytology 15 (1986), S. 155-167 
    Details
    ISSN: 1573-7381
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effects of X-irradiation on demyelination and remyelination were studied in the peripheral nerve of the mouse. Three days after injection of lysophosphatidyl choline into one sciatic nerve, a 20 Gy dose of X-rays was administered to the hind limb. At survival times ranging from 4 days to 6 months after injection, the nerves were examined by light and electron microscopy. Removal of myelin debris was retarded and remyelination delayed or prevented. The myelin sheaths which did form were thin and the configuration of Schmidt-Lanterman incisures and nodes of Ranvier was abnormal. Some of the chronically demyelinated fibres formed focal node-like complexes: patches of finely granular material coated the inner aspect of the axolemma, the external surface was covered by slender processes of Schwann cell cytoplasm, and an electron-dense lamina was present in the enlarged periaxonal space. Elsewhere demyelinated axons and their ensheathing Schwann cells were separated by gap junctions or transverse bands. The present findings indicate that the morphological differentiation of structures thought to be characteristic of nodes of Ranvier can take place in the absence of remyelination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01611652
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    Paper (German National Licenses)
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