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  • 1
    ISSN: 1432-0533
    Keywords: Nerve sheath tumors ; Melanotic neurofibroma ; Melanosomes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The authors report a case of a solitary melanotic neurofibroma involving the temporomalar area in a 17-year-old man. Light-microscopic study reveals a benign neurofibroma including melanin deposits. Electron microscopy shows typical premelanosomes and melanosomes within Schwann cell cytoplasm. The literature is reviewed, and theories of histogenesis for this unusual tumor are discussed.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2277
    Keywords: Experimental liver transplantation ; Living donor ; Heterotopic graft ; Primates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The need for liver grafts is critical in countries where brain death is not accepted as a legal criterion for organ retrieval. This experimental study was conducted with nonhuman primates in order to evaluate the feasibility of liver transplantation using a living donor. An original technique was employed to remove the left part of the liver from the donor: transection of the parenchyma was done while the blood flow was kept to the left part of the liver. In the recipients, the graft was placed heterotopically. No blood transfusions were administered to donors or recipients. In spite of a few failures, due to consequences of intraoperative bleeding, several donor operations using this original technique were successful, in the immediate postoperative period as well as several months later. Among the recipients, the large number of early failures suggests that the heterotopic position is probably not the appropriate one and that orthotopic transplantation should be preferred.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 5 (1999), S. 243-255 
    ISSN: 1434-6079
    Keywords: PACS. 76.60.-k Nuclear magnetic resonance and relaxation - 76.30.Kg Rare-earth ions and impurities - 75.10.Dg Crystal-field theory and spin Hamiltonians
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The electronic properties of the lanthanide ions are systematically investigated through the NMR of the protons of the tetramethylammonium ion , used as a probe in solution. The effective magnetic moments on the ions are obtained by measuring the paramagnetic shift of the proton resonance line due to the demagnetizing field that is proportional to the rare earth concentration. These results allow to estimate the sizes of the total splitting of the crystal field acting on the ground multiplet of the various lanthanides. The measured intermolecular longitudinal relaxation rates of the protons are compared with the computed values, both of the usual Solomon theory and of the Curie mechanism. The measured values are intermediate between those predicted by the two theories. This allows a rather accurate determination of the lifetimes of the electronic levels of the ions, as they little depend on the details of the description for the relative spatial microdynamics of the / repulsive ion pair.
    Type of Medium: Electronic Resource
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