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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Langenbeck's archives of surgery 360 (1983), S. 1-8 
    ISSN: 1435-2451
    Keywords: Functional adaption ; Alteration of maltases ; saccharase ; alkaline phosphatase ; Jejunal resection versus ileo-jejunal transposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Aktivität der Maltasen, Saccharase und alkalischen Phosphatase in unterschiedlichen Abschnitten des Darmes von Hunden wurde 0, 3, 6 und 9 Wochen nach einer operativen Veränderung der Integrität des Darmrohres bestimmt (Resektion des Jejunums, ileo-jejunale Transposition und Scheinoperation). Die Aktivität der Bürstensaumenzyme steigt vom Duodenum bis zum proximalen Ileum leicht an und ist im weiter distal gelegenen Ileum äußerst niedrig. Im Beobachtungszeitraum ändert sich die Aktivität der Enzyme bei den Kontrolltieren nicht; bei den jejunumresezierten Hunden steigt die Aktivität im Duodenum an, im jetzt anschließend an das Duodenum liegenden Ileum entsprechen die Werte der Aktivität denjenigen, die am Versuchsbeginn gefunden wurden. Nach ileojejunaler Transposition ist sowohl im jetzt proximal liegenden Ileum wie im distal verlagerten Jejunum eine Resektion der Enzymaktivität auf 60 bzw. 50 % der Ausgangswerte zu beobachten. Die Veränderungen der unterschiedlich gemessenen Enzyme verhalten sich gleichsinnig und ereignen sich innerhalb von 3 Wochen postoperativ. Die Ergebnisse zeigen in Abhängigkeit vom Typ der Operation (Resektion versus Transposition des Jejunums) unterschiedliche Veränderungen der Bürstensaumenzyme des Ileums.
    Notes: Summary The maltases, saccharase, and alkaline phosphatase activity of different intestinal segments of dogs was determined 0, 3, 6 and 9 weeks after an operation which altered the integrity of the intestinal tube (resection of jejunum, ileo-jejunal transposition, sham operation). Enzyme levels increase from duodenum to the proximal ileum but are very low more distally. At different time intervals enzyme activity remains unchanged in shame operated animals. After resection of the jejunum the activity in the duodenum increased, but was found almost unaltered in the proximal and distal ileum. In contrast, after ileo-jejunal transposition a reduced activity of 50 % and 60 % was observed informer jejunal or, ileal loops, respectively. The levels of the different measured enzymes change in a similar fashion, and the described alterations occur within 3 weeks after operation. The results show depending on the type of operation (resection versus transposition of the jejunum) a different alteration of ileal brush border enzymes.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 25 (1997), S. 356-365 
    ISSN: 0142-2421
    Keywords: cobalt ; palladium ; alloys ; Auger electron spectroscopy ; x-ray photoelectron spectroscopy ; surface composition ; surface segregation ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Palladium-based alloys and bimetallic systems are of importance in heterogeneous catalysis. Recently, attention was devoted to studies of the catalytic properties of the Co—Pd binary system. An important issue to consider is the surface composition of this alloy. The aim of the present work was to determine the surface composition of the polycrystalline CoPd alloys in a wide range of constituent concentrations (Co30Pd70 at.%, Co50Pd50 at.% and Co70Pd30 at.%) at temperatures up to 900°C. Quantitative AES and XPS analyses were used for this purpose. To determine the surface composition, the values of the inelastic mean free path (IMFP) for the studied alloys are necessary. These were derived from the elastic peak intensity. The reported values of the IMFP for Pd are in agreement with the data available in the literature. Reasonable consistency of the IMFP values for CoPd alloys and Co was also observed. The surface compositions of the CoPd alloys at room temperature determined by AES and XPS are in good agreement. It has been found that Pd segregates to surfaces of the Co30Pd70 and Co50Pd50 alloys at temperatures above 300°C. © 1997 John Wiley & Sons, Ltd.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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