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Digitale Medien

Fistuloscopy — an adjuvant technique for sealing gastrointestinal fistulae (1990)

Lange, V. ; Meyer, G. ; Wenk, H. ; [weitere]

Springer

Surgical endoscopy and other interventional techniques 4 (1990), S. 212-216

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ISSN: 1432-2218

Schlagwort(e): Fistuloscopy ; Percutaneous endoscopy ; Sealing of gastrointestinal fistulae ; Fibrin sealant

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Summary Endoscopic occlusion of gastrointestinal fistulae can be successfully achieved in a high percentage of patients. In cases where the intestinal opening of the fistula is not accessible, such treatment was hitherto impracticable. Fistuloscopy is a new technique which we have devised, using a flexible endoscope advanced percutaneously along the fistula tract to seal these gastrointestinal fistulae. Eleven out of 17 enterocutaneous fistulae and 5 out of 8 abscesses could be sealed using this technique. The complications in this series were all caused by fibrin glue injection into the fistulae under pressure. One patient died of an air embolism. Provided that elevation of the air pressure in the fistula system is strictly avoided, fistuloscopy is a safe and potent method of occluding gastrointestinal fistulae, which otherwise need prolonged conservative treatment or hazardous surgical intervention.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00316795

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Digitale Medien

Synthesis and characterization of polyimides endcapped with phenylethynylphthalic anhydride (1995)

Meyer, G. W. ; Glass, T. E. ; Grubbs, H. J. ; [weitere]

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 33 (1995), S. 2141-2149

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ISSN: 0887-624X

Schlagwort(e): polyimides ; 4-phenylethynylphthalic anhydride ; thermooxidative stability ; high-temprature MAS NMR ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The synthesis of high glass transition temperature (Tg 〉 300°C), amorphous, soluble, poly-imide oligomers of controlled molecular weight endcapped with 4-phenylethynylphthalic anhydride endcapping agent is described. The 4-phenylethynylphthalic anhydride was employed to afford a higher curing temperature (380-420°C) which widens the processing window compared to unsubstituted acetylene-endcapped polyimides. The polyimides were synthesized via solution imidization techniques, using the ester-acid of various dianhydrides and aromatic diamines. A “ one-pot” procedure utilizing NMP as the solvent and o-dichlo-robenzene as the azeotroping agent reproducibly produced fully imidized, but yet soluble wholly aromatic polyimides. Thermally cured samples were prepared with gel contents of up to 98% that displayed good solvent resistance. Glass transition temperatures comparable to high molecular weight linear analogs were produced. These polyimides also show excellent thermal stability as judged by thermogravimetric analysis (TGA). Model phenylethynyl imide compounds were synthesized and used to follow and elucidate the nature of the products formed from the phenylethynyl curing by using high temperature magic-angle 13C nuclear magnetic resonance (MAS NMR). Preliminary results indicate that the cure reaction can be followed by MAS NMR. However, the nature of the products being formed during the curing process is difficult to determine by the solid-state MAS NMR alone. Differential scanning calorimetry (DSC) data clearly show that the model system does indeed melt and displays a wide window before the strong cure exotherm is observed. © 1995 John Wiley & Sons, Inc.

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pola.1995.080331307

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Digitale Medien

Schwermetall- und chloridhaltige Filterstäube. I. Phasenanalysen und Modellversuche zum Recycling (1993)

Artelt, Holger M. ; Greinacher, Ekkehard ; Meyer, G.

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 335 (1993), S. 255-261

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ISSN: 0941-1216

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Flue Dusts Containing Heavy Metal Ions and Chloride.I. Phase Analysis, Model Experiments for RecyclingFour flue dusts from a cement factory, an electric-furnace steelmaking plant and a municipal waste plant were analyzed by powder diffraction methods. Chloride combines above all with alkali ions or heavy metal ions, especially yielding PbCl2 and KPb2Cl5. The controlled sublimation of these chloride compounds in open crucibles was developed and optimized in our laboratory. Between 850°C and 1150°C and at reaction times from 30 min up to 12 h, the chloride content decreases to below 0.1 wt-%. The sublimed phase mainly consists of alkali and lead chloride. Zinc is found in the flue dust as oxide and is enriched during this process. Recent investigations with a small waelz kiln give analogous results. With our procedure, the manufacturer by himself is able to exploit flue dusts containing a large amount of heavy metal elements and chloride which cannot be deposited. The remaining product contains mainly zinc oxide which can be recycled in the zinc industry or returned to the production process. The sublimed chloride compounds may be recycled in the potash industry.

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19933350307

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Digitale Medien

Investigations for obtaining semi-interpenetrating polymer networks based on monomers of different reactivity toward radicals (1993)

Derrough, S. N. ; Rouf, C. ; Widmaier, J.-M. ; [weitere]

New York, NY [u.a.] : Wiley-Blackwell

Journal of Applied Polymer Science 48 (1993), S. 1183-1188

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ISSN: 0021-8995

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: Classically, the one-step synthesis of interpenetrating polymer networks (IPNs) and related materials requires noninterfering polymerization modes to achieve distinct networks, held together by only physical entanglements. For the combination of (meth) acrylic and allylic monomers, both polymerizable by free radicals, a new in situ sequential synthesis for obtaining semi-IPNs is proposed. Using specific initiators that decompose at two different temperatures, refractive index measurements, Fourier transform infrared spectroscopy, and dynamic mechanical analysis have shown that neat species are formed and that the two monomers do not copolymerize. © 1993 John Wiley & Sons, Inc.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/app.1993.070480706

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Digitale Medien

Untersuchungen zur thermischen Zersetzung der Ammoniumyttriumhalogenide III. Ammoniumyttriumbromid, (NH4)3YBr6Professor Wolfgang Jeitschko zum 60. Geburtstag gewidmet (1996)

Oppermann, H. ; Huong, D. Q. ; Teresiak, A. ; [weitere]

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 622 (1996), S. 1612-1616

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ISSN: 0044-2313

Schlagwort(e): Ammonium yttrium bromide ; thermal decomposition ; thermochemical data ; phase transition ; Chemistry ; Inorganic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Beschreibung / Inhaltsverzeichnis: Investigation on the Thermal Decomposition of Ammonium Yttrium Halides. III. Ammonium Yttrium Bromide, (NH4)3YBr6The decomposition equilibria of NH4Br and (NH4)3YBr6 were determined by total pressure measurements. It was shown by high temperature X-ray patterns and DTA that (NH4)3YBr6 and YBr3 show phase transitions in the measured temperature region. An endothermic transition of YBr3 starts near 300°C and is very slow. By interpretation of the thermal decomposition of (NH4)3YBr6, the enthalpy of formation, and the standard entropy was derived. In the system NH4Br/YBr3 only the described phase (NH4)3YBr6 exists.

Notizen: Durch Gesamtdruckmessungen wurden die Zersetzungsgleichgewichte von NH4Br und (NH4)3YBr6 ermittelt. Hochtemperatur-Röntgenaufnahmen und DTA zeigten, daß bei (NH4)3YBr6 und YBr3 im untersuchten Temperaturbereich Phasenumwandlungen erfolgen. Eine endotherme Umwandlung von YBr3 erfolgt oberhalb von 300°C und verläuft sehr langsam. Die Auswertung der thermischen Zersetzung von (NH4)3YBr6 liefert die Bildungsenthalpie ΔHBo((NH4)3YBr6,f,298) = -402 ± 7 kcal/mol und die Standardentropie So((NH4)3YBr6,f,298) = 134 ± 9 cal/Kmol. Eine weitere komplexe Phase existiert im System NH4Br/YBr3 nicht.

Zusätzliches Material: 5 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/zaac.19966220927

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