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  • 1995-1999  (5)
  • 1985-1989  (6)
  • Chemistry  (10)
  • Anastomosenstoma  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Langenbeck's archives of surgery 381 (1996), S. 333-336 
    ISSN: 1435-2451
    Keywords: Notfalleingriffe in der Darmchirurgie ; Anastomosenstoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In der Notfallchirurgie erscheint eine primäre Darmanastomose oft als risikoreich. Diskontinuitätsresektionen haben den Nachteil einer 2. Laparotomie zur Wiederherstellung der Kontinuität. Wenn eine ausreichende Mobilisation der betroffenen Darmabschnitte möglich ist, bevorzugen wir die Anlage eines Anastomosenstomas. Nach Resektion des erkrankten Darmabschnitts werden die zu- und abführende Schlinge gemeinsam durch eine Bauchdeckentrepanation vor die Bauchdecke gelagert und die Hinterwände der Schlingen anastomosiert. Die vordere Darmwand bleibt unverschlossen und wird in mukokutaner Technik als Stoma eingenäht. Bisher haben wir diese Methode bei 91 Patienten angewandt, 73mal handelte es sich um Notfalleingriffe. Kein Patient starb an Komplikationen, die methodenbedingt waren, 21mal führte allerdings die Grunderkrankung zum Tod des Patienten. Die Darmkontinuität konnte in 78 Fällen wiederhergestellt werden. Das Anstomosenstoma schützt die Rückwand vor erhöhtem Druck und erlaubt die tägliche Kontrolle der Anastomose. Bei extraperitonealer Rückverlagerung des Stomas entfällt die erneute Laparotomie zur Kontinuitätswiederherstellung. Die Anlage des A nastomosenstomas ist in den meisten Dünn- und Dickdarmabschnitten möglich.
    Notes: Abstract In emergency surgery of the bowel a primary anastomosis may be risky. Discontinuing colostomies have the disadvantage that a secondary laparotomy is necessary to restore continuity. If sufficient bowel loop mobilization is possible, we prefer to perform an anastomotic stoma. After resection of the diseased bowel segment, we bring the proximal and distal loop together and proceed to the anastomosis of the posterior wall. The anterior wall of the anastomosis remains open and is then fixed to the abdominal wall as a stoma. So far, we have used this method in 91 patients. In 73 cases this technique was performed during emergency operations. No patient died as a result of complications of the method; 21 patients, however, died as a consequence of their primary disease. Bowel continuity could be restored in 78 cases. The anastomotic stoma protects the posterior wall from elevated pressure and allows daily control of the anastomosis. In the case of extraperitoneal closure, a secondary laparotomy for reconstruction of the continuity is not necessary. The anastomotic stoma can be performed in most regions of the small and large bowel.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 48 (1997), S. 73-74 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 48 (1997), S. 134-134 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 48 (1997), S. 198-199 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Concerning the Products of the Reaction of Methyl Bromide and Ethyl Bromide with Potassium Hydroxide in Aqueous Methanolic Solutions and the Progress of this SN2-ReactionInvestigations of the reaction of methyl bromide and ethyl bromide with potassium hydroxide in methanolic and aqueous methanolic solutions show that the main products of these reactions are dimethyl ether and ethylmethyl ether. The reaction rates measured in methanolic or aqueous methanolic solutions are the same whether potassium hydroxide or potassium methoxide are used. These results are caused by an equilibrium between hydroxide and methoxide ions with which we could establish the equilibrium constant near 0.6. This means that a solution of sodium hydroxide c = 0.1 moll-1 in methanol contains roughly 99.8% of methoxide ions. The reaction rates in methanolic as well as in aqueous methanolic solutions are strict second order. The reaction rate measured at several temperatures permitted the calculation of EA≠, ΔH≠, ΔS≠ and ΔG≠. Furthermore the kinetic investigations show that the nucleophilicity of methoxide ions is lower compared to hydroxide ions. The calculation of the Swain-Scott-parameter n results in a nucleophilicity scale in order to methoxide, hydroxide, ethoxide ions. The kinetic investigations of the reaction of ethyl bromide with methoxide and hydroxide ions in methanolic solutions demonstrate that at high temperatures the rate constant of methoxide ions is higher than that of hydroxide ions. The opposite case can be observed at lower temperatures. At the temperature of 20 °C the rate constants of both reactions are equal. This is to do with the isokinetic effect which one is rarely able to observe at room temperatures.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
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  • 6
    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: Thermostable poly(phenyl quinoxaline) adheres only insufficiently to copper. Treatment of the copper surface in a nonthermal plasma of a radio frequency glow discharge increases the adhesion significantly. Careful plasma oxidation of the copper surface and plasma-deposited glow polymer layers as adhesion promoters were found to be particularly useful. In the case of oxidative modification the adhesion of poly(phenyl quinoxaline) has a maximum depending on the degree of surface oxidation.
    Notes: Das thermostabile Polyphenylchinoxalin (PCO) haftet nur ungenügend auf Cupfer. Eine Behandlung der Cupferoberfläche im nichtthermischen Plasma einer Hochfrequenz-Glimmentladung führte zu erheblichen Verbesserungen der Haftfestigkeit. Als besonders geeignet erwiesen sich die vorsichtige Plasmaoxidation der Cupferoberfläche und die plasmachemische Abscheidung haftvermittelnder Glimmpolymerschichten. Bei der oxidativen Modifizierung des Cupfers durchläuft die Haftfestigkeit des PCO ein Maximum in Abhängigkeit vom Oxidationsgrad der Oberfläche.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: NO Abstract.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 40 (1989), S. 19-22 
    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: Crosslinking of novolac fibres was studied by means of plasma etching in connection with light and scanning electron microscopy. With proceeding crosslinking by formaldehyde from the outer skin to the inner of the fibre a highly cross-linked shell of not more than 10 to 13 μm thickness was formed after about 8 h crosslinking time. On the other hand, more porous networks of modified novolacs permit a rapid and complete crosslinking of the fibres.
    Notes: Mittels Plasmaätzung in Verbindung mit Licht- und Rasterelektronenmikroskopie wurde der Vernetzungsverlauf von Phenolharznovolakfasern verfolgt. Bei der von außen nach innen fortschreitenden Vernetzung mit Formaldehyd bildet sich im Zeitraum von etwa 8 h eine 10 bis 13 μm dicke Schicht aus, deren Netzwerkdichte eine weitere Vernetzung des Faserinneren verhindert. Weitmaschiger aufgebaute Netzwerke modifizierter Ausgangsnovolake hingegen lassen eine schnelle und vollständige Durchvernetzung der Fasern zu.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 37 (1986), S. 655-657 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 37 (1986), S. 687-695 
    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: Short time treatments (t ≦ 300 s) of polyethylene and polypropylene films in a nonthermal plasma of O2 and NH3 radiofrequency glow discharges lead to the formation of functional groups and therefore to a significant increase of adhesion of vapour deposited aluminium. The deposition of thin layers of glow polymers from silancs and acrylic acid gave also a high level of adhesion. In the case of oxygen plasma modification of polypropylene, the aluminium was strongly oxidized along the interface by simultaneous reduction of O-functional groups on the polypropylene surface, corresponding t o the high negative value of redox potential of aluminium. The cause of increased adhesion may be a higher electrostatic attraction or the formation of chelate-like complexes between aluminia and the oxidized surface of polypropylene.
    Notes: Die kurzzeitige Behanlung (t ≦ 300 s) von Polyethylen- und Polypropylenfolien im nichtthermischen Plasma von O2- und NH3-Hochfrequenz-Glimmentladungen und die damit verbundene Schaffung von funktionellen Gruppen an der Polymeroberfläche führte zu erheblichen Verbesserungen der Adhäsion von aufgedampften Aluminiumschichten. Als ähnlich günstig erwies sich die Abscheidung von haftvermittelnden Glimmpolymerschichten aus Silan- und Acrylsäre. Im Falle des im O2-Plasma vorbehandelten Polypropylens wurde das Aluminium entsprechend seinem stark negativen Redoxpotential durch die O-funktionellen Oberflächengruppen des Polypropylens an der Verbundgrenzfläche oxidiert. Als Ursache für die erhöhte Adhäsion wird eine verstärkte elektrostatische Anziehung der Verbundkomponenten oder die Bildung von Al—O—C-Komplexen diskutiert.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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