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  • Electronic Resource  (2)
  • Antigen distribution  (1)
  • C1 oxygenates  (1)
  • 1
    ISSN: 1437-160X
    Keywords: Antigen distribution ; Experimental chronic polyarthritis ; Rheumatoid organs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In organs of rheumatoid inflammation avascular tissue is nourished by perfusion either directly from the blood stream or by neighbouring blood vessels (borderline-tissue). An open question remains whether this borderline-tissue promotes only the known antigen persistence, or also the first deposition of the pathogenetically important microbial antigen, and subsequently a deposition of immune complexes. The three markers (carbon, latex, and living bacteria) used in this study led to nearly the same pattern of deposition in two groups of organ systems: (1) Organs with clearance function belonging to the mononuclear phagocyte system (MPS); (2) organs with borderline-tissues: joint, kidney, artery, heart valve, and eye. This deposition at the borderline can be observed best in areas of the joint where highly vascularized tissues are adjacent to avascular tissues nourished via perfusion: (1) perichondrium, (2) peritendineum, (3) periosteum, and (4) endo- and perimysium. These localisations of particle deposition correspond exactly with the intraarticular predilection sites of chronic rheumatoid inflammation in man and animals. Our results indicate an easier settlement of corpuscular material in these localisations, which at the same time are unable to eliminate such substances, unlike the organs of the MPS. Our studies seem to support the theory of pathogenetic importance of the borderline-tissues as a localizing factor in the perpetuating rheumatoid inflammation.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1572-879X
    Keywords: gas phase ; methane partial oxidation ; vanadia/silica-silicon ; C1 oxygenates ; C2+ hydrocarbons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A very low surface area silica-silicon substrate has been used as a support for vanadium oxide and has been tested in the partial oxidation of methane. Use of a reactor with variable dead volume ahead of the bed of the catalyst allows determining the relevance of gas phase reactions in initiating methane conversion. Experimental evidence supports that at atmospheric pressure C1 oxygenates are essentially produced on the catalyst surface rather than in the gas phase. Comparison with a high surface area silica-supported vanadium oxide catalyst clearly highlights the double role of surface area in promoting catalytic activity, but also in promoting non-selective further oxidation of reaction products. It is shown that a reaction system combining dead volume upstream the bed of the catalyst and a very low surface area is very promising to activate methane conversion to C1 oxygenates and C2+ hydrocarbons at remarkable TOF number preventing further non-selective oxidation. In addition, production of C2+ hydrocarbons is observed at temperatures as low as 750 K.
    Type of Medium: Electronic Resource
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