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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 92 (2002), S. 710-715 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Two-photon laser-induced fluorescence spectroscopy is used to detect ground-state atomic hydrogen in highly diluted SiH4–H2 radio-frequency discharges currently used for microcrystalline silicon thin film deposition. Along with the fluorescence coming from the hydrogen atoms created in the discharge, additional atoms arising from photodissociation of silicon containing species at 205 nm are observed. This parasitic effect is identified as resulting mainly from the disilane molecules formed in the plasma. Hydrogen atoms created in the plasma and originating from the photodissociation are discriminated by a spectral analysis of the laser-induced fluorescence line profile and relative densities are deduced. Some results on the hydrogen atom and disilane concentrations as functions of the silane dilution, radio-frequency power, gas pressure, and gas temperature are given to illustrate the potentiality of such a diagnostic in SiH4–H2 discharges containing up to 6% of silane. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Copenhagen : Munksgaard International Publishers
    Allergy 55 (2000), S. 0 
    ISSN: 1398-9995
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Metal ions such as Ni2+, Co2+, Cu2+, or Cr3+ are haptens with a high immunogenic potential, as contact dermatitis caused by ionic metals occurs in about 10–15% of the human population. Since alloys containing Ni2+, Co2+, and Cr3+ are components of implants in replacement surgery, dentures, orthodontic wires, and various other devices, adverse reactions to metal ions create serious problems in practical medicine as incompatibility reactions to metal-containing biomaterials. On the other hand, contact dermatitis to metal ions such as Ni2+ is a well-established model for studying the molecular mechanisms involved in the recognition of haptens by the immune system. Although many investigations have been performed to elucidate the molecular interactions causing contact hypersensitivity in man, many aspects remain to be clarified. This review will focus on the experimental data accumulated so far on the immunologic mechanisms responsible for the recognition of metal ions by T cells and eliciting adverse immune reactions causing contact dermatitis.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1173
    Keywords: Schlüsselwörter: Extraabdominelle Fibromatose – Desmoidtumor – Keloid – Ileus – Gardner-Syndrom ; Key words: Extraabdominal fibromatosis – Desmoid tumor – Keloid – Ileus – Gardner's syndrome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract. The report deals with the clinical features of a 26-year-old man with the extraabdominal form of deep fibromatosis, which became manifest at the age of 18 years as acute ileus caused by diffuse intraabdominal fibromatous tumours. In the later course of the disease extensive fibromatous lesions developed, mainly at the skin. In addition, multiple keloids occurred after excision or after negligible traumas. The pathogenetic events of the clinical picture described may be linked to the activation of mesenchymal cells leading to the generation of either fibromatous tumours or posttraumatic keloids.
    Notes: Zusammenfassung. Vorgestellt wird ein 26jähriger Mann mit der extraabdominellen Form einer tiefen Fibromatose, die sich erstmalig im 18. Lebensjahr als akuter Ileus aufgrund ausgeprägter intraabdomineller Bindegewebstumoren manifestierte. Später traten flächenhafte, fibromatöse Bindegewebstumoren bevorzugt an der Haut auf. Neben diesen spontan entstandenen kutan und subkutan gelegenen Hauttumoren fanden sich auch Keloide nach Schnittverletzungen oder Bagatelltraumata an der Haut. Diesem Krankheitsbild liegt möglicherweise eine Aktivierung mesenchymaler Zellen zugrunde, die bei entsprechender Disposition zu fibromatösen Tumoren oder posttraumatischen Keloiden führt.
    Type of Medium: Electronic Resource
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