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  • 1990-1994  (3)
  • Chemistry  (2)
  • Henoch-Schönlein purpura  (1)
  • 1
    ISSN: 1432-198X
    Keywords: Atopy ; IgA nephropathy ; Henoch-Schönlein purpura ; IgE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The incidences of clinical and biological markers of atopy were investigated in 16 children with IgA nephropathy (IgAN) (group A) and in 22 with Henoch-Schönlein purpura nephritis (HSPN) (group B). The incidence of increased plasma IgE levels according to age-matched normal values was significantly higher in group B (17/22, 77%) than in group A (7/16, 44%) (P〈0.05). Although not significant, the incidences of positive RAST tests and of a history of typical atopic symptoms were also higher in group B [10/22 (45%) and 11/22 (50%), respectively] than in group A [4/16 (25%) and 5/16 (31%), respectively]. Moreover, IgE deposits were demonstrated by a peroxidase/anti-peroxidase method on cutaneous Langerhans and mast cells in 4 of 6 patients with HSPN. Thus immunoallergy might account, in some cases, for the cutaneous, intestinal and pulmonary signs observed in HSPN, but not in IgAN. We postulate stimulation of IgE-sensitized mast cells by specific antigens in the presence of IgA circulating immune complexes (CIC), release of vasoactive substances, increased capillary permeability and perivascular deposition of IgA CIC.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 214 (1994), S. 123-136 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Durch Hydrosilylierung von N,N'-Diallyldiimiden mit α,ω-Dihydropoly(dimethylsiloxan)en wurden modifizierte Imid-Siloxan-Copolymere hergestellt. Die Copolymeren wurden mittels IR- und NMR-Spektroskopie charakterisiert. Molmasse, Molmassenverteilung und thermische Eigenschaften der Copolymeren wurden ermittelt. Die Copolymeren wurden in verschiedenen Anteilen als Additive zusammen mit einem Füllstoff in ein Silikonpolymeres eingearbeitet, wobei Imid-Silikonkautschuke vom HTV-Typ erhalten wurden. Die mechanischen Eigenschaften der vulkanisierten Kautschuke wurden bestimmt.
    Notes: A study has been carried out on the preparation of some modified imide-siloxane copolymers. This has been accomplished by means of addition of α,ω-dihydropoly(di-methylsiloxane)s to N,N'-diallyldiimides by hydrosilylation reaction. The copolymers were characterized by IR and NMR spectroscopy methods. Molar mass, molar mass distribution, thermal and mechanical properties of copolymers were determined. These copolymers are used as additives, mixing them in different ratios with a silicone polymer and filler to obtain imide-silicone rubbers of high temperature vulcanizing (HTV) type. Mechanical properties of the vulcanized rubbers were evaluated.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 107-109 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The equilibration of octamethylcyclotetrasiloxane with 1,3-divinyl-tetramethyl-disiloxane was investigated. The equilibration process was followed by viscosimetric measurements. The relation between the viscosity of the end product and the molar ratio of original components was determined mathematically.
    Notes: Die durch Alkalihydroxid beschleunigte Äquilibrierung von Octamethyl-cyclotetrasiloxan mit 1,3-Divinyltetramethyldisiloxan wird untersucht. Der zeitliche Ablauf der Äquilibrierung wird durch Viskositätsmessungeii verfolgt. Der Zusammenhang zwischen Viskosität des Endproduktes und dem Molverhältnis der Ausgangsprodukte wird mathematisch dargestellt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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