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  • 1
    Electronic Resource
    Electronic Resource
    Plasma factors influencing PGI2-like activity in patients with IgA nephropathy and Henoch-Schönlein purpura (1989)
    Springer
    Pediatric nephrology 3 (1989), S. 61-67 
    Details
    ISSN: 1432-198X
    Keywords: IgA nephropathy ; Henoch-Schönlein purpura ; Plasma ; PGI2-like activity ; Lipoproteins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Plasma factors influencing vascular PGI2-like activity (PSA) were studied in 45 patients with IgA nephropathy, 18 with Henoch-Schönlein purpura, including 8 children with nephrotic syndrome, and 41 controls. The results were compared with the levels of plasma high-density lipoprotein (HDL), low-density lipoprotein (LDL) and fatty acid components of plasma phospholipids. The plasma of 38 of 45 patients with IgA nephropathy and 14 with Henoch-Schönlein purpura showed a diminished ability or no ability to support PSA. Twenty-three patients with IgA nephropathy and 10 with Henoch-Schönlein purpura exhibited an inhibitory activity against PGI2 production. The plasma HDL level was lower, while the LDL level and the LDL/HDL ratio were significantly higher in IgA nephropathy and Henoch-Schönlein purpura cases than in the controls. A high LDL/HDL ratio was associated with a low plasma PSA. The levels of arachidonic acid and its precursor were not lower in the plasma of patients than in the controls. The decreased PGI2 synthesis may play an important role in the pathogenesis of IgA nephropathy and Henoch-Schönlein purpura, but it can not be explained by reduced PG precursors. LDL may have an inhibitory, and HDL a protective effect on PGI2 synthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00859628
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  • 2
    Electronic Resource
    Electronic Resource
    Possible pathogenic role of IgE in Henoch-Schönlein purpura (1994)
    Springer
    Pediatric nephrology 8 (1994), S. 169-171 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00865470
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  • 3
    Electronic Resource
    Electronic Resource
    Über den reaktionsmechanismus der silylierung von cellulose mit hexamethyldisilazan in pyridin (1976)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 177 (1976), S. 947-949 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1976.021770332
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  • 4
    Electronic Resource
    Electronic Resource
    Über den lösungsmitteleffekt bei der silylierung von cellulose mit hexamethyl-disilazan (1973)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 165 (1973), S. 335-338 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1973.021650131
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  • 5
    Electronic Resource
    Electronic Resource
    Preparation and investigation of silicon rubber containing imide-siloxane copolymers (1994)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 214 (1994), S. 123-136 
    Details
    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
    URL: http://dx.doi.org/10.1002/apmc.1994.052140112
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  • 6
    Electronic Resource
    Electronic Resource
    Zur „Äquilibrierung“ von Octamethyl-cyclotetrasiloxan mit 1,3-Divinyl-disiloxan (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 107-109 
    Details
    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
    URL: http://dx.doi.org/10.1002/actp.1991.010420215
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  • 7
    Electronic Resource
    Electronic Resource
    1H and 13C studies of alkenes, epoxides and cyclic thionocarbonates (1977)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 10 (1977), S. 14-19 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1H and 13C chemical shift data are presented and discussed for a number of di- and tri-alkyl substituted alkenes, epoxides and thionocarbonates. The completely stereospecific interconversion of these compounds, together with the n.m.r. data, allows a straightforward and quantitative stereochemical analysis. For 1H n.m.r., the most useful intermediates proved to be the thionocarbonates. The differential shieldings between cis and trans isomers are tentatively explained in terms of the conformational change of the 5-membered thionocarbonate ring. In 13C n.m.r., either series can be useful to distinguish between stereoisomers. The conclusions stemming from the 13C n.m.r. results complement the 1H n.m.r. studies.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270100105
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  • 8
    Electronic Resource
    Electronic Resource
    Neutralization-reionization experiments; a simple metal vapour cell for VG analytical ZAB-2F mass spectrometers (1988)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 23 (1988), S. 804-807 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210231114
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  • 9
    Electronic Resource
    Electronic Resource
    Bindungsstruktur von Alkenylsiliciumorganischen Verbindungen (1966)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 347 (1966), S. 191-198 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Dielectric measurements on trimethylvinyl, allyl, and butenyl silane have shown that the vinyl silane has a structure being similar with that of trimethylphenyl silane. Where as in the latter compound, however, six electrons are on a seven-centric molecular term, the two π-electrons of the vinyl compound are on a three-centric one. In both cases the Si atom exhibites +I inductive and -M mesomeric action. The reactivity of allyl silane is due the strong M and E effect resulting from CH2 hyperconjugation and the +I effect of Si.
    Notes: Dielektrische Untersuchungen an Trimethyl-vinyl, Allyl- und Butenyl-silan zeigten, daß Vinyl-trimethyl-silan eine ähnliche Struktur wie Phenyl-trimethyl-silan besitzt mit dem Unterschied, daß die zwei π-Elektronen bei der Vinylverbindung auf ein trizentrisches, hingegen bei der Phenylverbindung sechs Elektronen auf ein heptazentrisches Molekülniveau gelangen. In beiden Fällen übt das Silicium eine +induktive (+I) und -mesomere (-M) Wirkung aus. Die Reaktionsfähigkeit der Allylverbindung ist dem stark erhöhten M- und E-Effekt zuzuschreiben, der durch den Hyperkonjugationseffekt der CH2-Gruppe und den +I-Effekt des Siliciums hervorgerufen wird.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19663470312
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  • 10
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Bindungsstruktur der Derivate von Trimethyl-silyl-N-pyrrol (1969)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 367 (1969), S. 293-302 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: For a general investigation on the Si—N bond N-substituted (silyl)-pyrrole derivatives have been prepared by means of already known, and new, methods. The dipole moments of these compounds were determined and their UV spectra recorded. From these data it is concluded that the Si—N bond has partial double bond, dπ-pπ, character. The lone electron pair on the nitrogen is however, displaced towards the silicon only to a small extent, owing to the stronger electron attracting effect of the pyrrole ring. These conclusions are by quantumchemical estimations.
    Notes: Für Untersuchungen über die Si—N-Bindung wurden N-substituierte Pyrrolderivate teilweise nach bekannten, z. T. nach neuen Methoden hergestellt. Es wurden Dipolmomente dieser Verbindungen nach HEDESTRAND ermittelt sowie ihre UV-Spektren aufgenommen.Dabei ergab sich, daß die Si—N-Bindung den Charakter einer partiellen Doppelbindung besitzt. Das einsame Elektronenpaar am Stickstoff ist aber nur geringfügig in Richtung der d-Bahn des Siliciumatoms verschoben; es tritt nur eine schwache dπ-pπ-Bindung auf, woraus folgt, daß der Pyrrolring wesentlich stärker elektronenanziehend wirkt als das Siliciumatom. Diese Folgerungen werden durch quantenchemische Berechnungen gestützt.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19693670512
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