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  • Inorganic Chemistry  (17)
  • APC resistance  (2)
  • Polymer and Materials Science  (2)
  • 99m-Tc-HMPAO-SPECT imaging  (1)
  • 1
    ISSN: 1437-160X
    Keywords: Systemic vasculitis ; CNS involvement ; Neurologic symptoms ; 99m-Tc-HMPAO-SPECT imaging ; Early detection and prevention
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The objective of this study was to evaluate whether mild neurological symptoms suggestive of neuropsychiatric involvement may be associated with cerebral perfusion defects as detected by functional brain imaging with 99m-Tc-HMPAO-SPECT (single photon emission computed tomography). SPECT analysis for the early detection of central nervous system (CNS) involvement was evaluated in 40 consecutive patients with systemic vasculitis or with Sneddon's syndrome. Of these, 18 patients showed overt neuropsychiatric symptoms, so-called major symptoms (e.g. motoric or sensible defects); 6 had mild symptoms like headache or cognitive disorders, so-called minor symptoms; 16 patients did not present with any of these symptoms. SPECT abnormalities were detected in 16 of the 18 patients with overt neuropsychiatric symptoms (89%). Five of the 6 patients with minor symptoms (83%) and 5 of the 16 patients without neurological symptoms (31 %) also had SPECT abnormalities. There was no relation to disease activity or duration. We concluded that the high sensitivity of SPECT (87.5%) in detecting perfusion abnormalities among the evaluated group of patients indicates its suitability for early diagnosis of vasculitic CNS involvement.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0584
    Keywords: Key words Anticardiolipin antibodies ; Lupus anticoagulants ; APC resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Anticardiolipin antibodies (aCL) or lupus anticoagulants (LA) have been found to exert an inhibitory action upon the activation and function of protein C, a natural coagulation inhibitor. Recently an in vitro phenomenon called resistance to activated protein C (APC resistance) has been described as the most frequent cause of hereditary thrombophilia. In order to see whether a positive association of APC resistance with aCL exists we examined plasma of 162 consecutive outpatients referred for thrombophilia screening. Further, the IgG fraction was isolated from plasma of two aCL-positive and LA-negative patients and of two aCL-negative healthy subjects by means of protein A affinity chromatography. Each of these isolates was mixed with normal plasma, and the APC resistance was assayed; 25/162 (15.4%) patients had confirmed abnormal APC resistance. Only 1/25 (4.0%) APC resistance-positive patients and 11/137 (8.0%) APC resistance-negative patients had positive IgG- and/or IgM-aCL (p=0.5, nonsignificant). In the in vitro test system the APC resistance ratio remained unaffected after addition of normal IgG or aCL-IgG fraction in the tested normal plasma and did not deviate from the range of buffer controls. These data do not suggest any association of aCL with abnormal APC resistance. aCL-IgG fractions from aCL-positive and LA-negative plasmas do not interfere with the APC resistance test system in vitro in low concentration.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0584
    Keywords: Anticardiolipin antibodies ; Lupus anticoagulants ; APC resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Anticardiolipin antibodies (aCL) or lupus anticoagulants (LA) have been found to exert an inhibitory action upon the activation and function of protein C, a natural coagulation inhibitor. Recently an in vitro phenomenon called resistance to activated protein C (APC resistance) has been described as the most frequent cause of hereditary thrombophilia. In order to see whether a positive association of APC resistance with aCL exists we examined plasma of 162 consecutive outpatients referred for thrombophilia screening. Further, the IgG fraction was isolated from plasma of two aCL-positive and LA-negative patients and of two aCL-negative healthy subjects by means of protein A affinity chromatography. Each of these isolates was mixed with normal plasma, and the APC resistance was assayed; 25/162 (15.4%) patients had confirmed abnormal APC resistance. Only 1/25 (4.0%) APC resistance-positive patients and 11/137 (8.0%) APC resistance-negative patients had positive IgG- and/or IgM-aCL (p=0.5, nonsignificant). In the in vitro test system the APC resistance ratio remained unaffected after addition of normal IgG or aCL-IgG fraction in the tested normal plasma and did not deviate from the range of buffer controls. These data do not suggest any association of aCL with abnormal APC resistance. aCL-IgG fractions from aCL-positive and LA-negative plasmas do not interfere with the APC resistance test system in vitro in low concentration.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 50 (1978), S. 956-957 
    ISSN: 0009-286X
    Keywords: Heterogene Katalyse ; Platin-Trägerkatalysatoren ; Bimetall-Katalysatoren ; Dispersität ; Aromatisierung ; Hydrogenolyse ; Aromatisierung ; n-Hexan ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 548 (1987), S. 204-216 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of Crystalline Metal Silicate Hydrates of Layer StructureThe purpose of this paper is the synthesis of metal silicate hydrates by means of hydrothermal crystallization from the ternary systems M2/nO—SiO2—H2O (M = Li, Na, K, Ca, Mg). The prepared products, the sodium silicates ilerite, magadiite, and kenyaite and a potassium silicate hydrate, are species of crystallization sequences of a hydrothermal quartz formation process at low temperatures. The product sequences, obtained under different crystallization conditions are given and discussed.
    Notes: Gegenstand der Arbeit ist die Synthese von Metallsilicathydraten (M—SH) mit Schichtstruktur durch hydrothermale Kristallisation im ternären System M2/nO—SiO2—H2O (M = Li, Na, K, Ca, Mg). Die erhaltenen Produkte, die Natriumsilicathydrate Ilerit, Magadiit und Kenyait und ein Kaliumsilicathydrat sind Bestandteile von Produktfolgen im hydrothermalen Quarzbildungsprozeß bei niedrigen Temperaturen. Die Produktfolgen bei verschiedenen Kristallisationsbedingungen werden angegeben und diskutiert.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 268 (1952), S. 244-259 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Untersuchungen über die Beständigkeit 0,1 n Chloraminlösungen, die sich über fast 1½ jahre erstreckten, führten zu dem Ergebnis, daß eine solche Lösung bei Verwendung eines reinen Präparates sehr gut haltbar ist und nur in Abständen von zwei bis drei Monaten kontrolliert zu werden braucht.Für Titrationen in saurer Lösung ist Chloramin nur geeignet, wenn die Umsetzung mit dem zu oxydierenden Stoff schnell erfolgt. Sehr glatt lassen sich AsIII und SbIII in saurer Lösung titrieren; geeignete Indikatoren sind p-Äthoxychrysoidin und Brillantcarmoisin. Bei der Bestimmung von Eisen(II)-salzen und Hexacyanoferraten(II) muß Chloraminlösung in geringerem Überschuß zugegeben und dieser mit As2O3-Lösung zurückgemessen werden.
    Additional Material: 11 Tab.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 354 (1967), S. 10-11 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The purification of NO+-contaminated concentrated sulphuric acid by means of formaldehyde or hydrazinium sulphate is investigated.
    Notes: Es wird die Entfernung von NO+ aus technischer konz. Schwefelsäure durch Zusatz von Formaldehyd oder Hydraziniumsulfat untersucht.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 432 (1977), S. 242-248 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Hydrogenation of Hydrocarbons on Catalysts of the System Porous Glass-MetalThe hydrogenation of hydrocarbons such as cyclohexen, benzene and styrene on metal catalysts (Ni, Pd, Pt) supported by porous glasses and zeolites was investigated in the gasphase.In dependence on the pore structure catalysts of the type porous glass-metal are able to a shape selective catalysis like zeolite catalysts.
    Notes: Die Hydrierung von Kohlenwasserstoffen, wie Cyclohexen, Benzol und Styrol wurde in der Gasphase an Metall-Trägerkatalysatoren (Ni, Pd, Pt) auf der Basis von porösen Gläsern und Zeolithen untersucht.In Abhängigkeit von der Porenstruktur zeigen Katalysatoren des Typs poröses Glas-Metall die Fähigkeit zu einer formselektiven Katalyse wie Zeolith-Katalysatoren.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 434 (1977), S. 297-304 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Modification of Xerogels by Acid TreatmentThe influence of an acid treatment on the texture and structure of silica (xerogel) has been studied. Characteristic changes caused by acid treatment of silica consist of increasing pore-volume decreasing specific surface and of a maximum shift to larger radii of pore distribution in the range of micro and meso pores.A tendency in respect to an increasing degree of order for acid treated silica could be shown.
    Notes: Der Einfluß einer Säurebehandlung auf die Textur und Struktur von Kieselgelen (Xerogelen) wurde untersucht. Die charakteristischen Veränderungen an säurebehandelten Kieselgelen bestehen aus einer Abnahme der spezifischen Oberfläche der Zunahme des spezifischen Porenvolumens und einer Verschiebung der Maxima der Porenradienverteilungskurven  -  im Bereich der Mikro- und Mesoporen  -  zu größeren Porenradien.Eine Tendenz zur Erhöhung des Ordnungsgrades säurebehandelter Kieselgele konnte nachgewiesen werden.
    Additional Material: 4 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 393 (1972), S. 50-58 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the chemically thermal modification of gelatinous silica with B2O3The chemically thermal modification of gelatinous silica with boron oxide was studied in dependence on the quantity of impregnated boron oxide, on time, and temperature of the treatment. A. condensation mechanism is discussed on the basis of structure variation of the modification samples.
    Notes: Die chemisch-thermische Modifizierung von Kieselgel mit Boroxid wurde untersucht in Abhängigkeit von der Menge an aufgetränktem Boroxid, von der Zeit und der Temperatur der Thermobehandlung. Ein Kondensationsmechanismus wird im Zusammenhang mit Strukturveränderungen diskutiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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