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  • 1
    ISSN: 1432-055X
    Keywords: Schlüsselwörter Hemihepatektomie ; Hämodynamik ; Oxygenierung ; Lebervenenkatheter ; Key words Hemihepatectomy ; Hemodynamic ; Oxygenation ; Liver venous catheter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract Objective: The aim of this study was to compare low dose dopamine and dopexamine with respect to of liver-venous oxygen saturation, oxygen delivery and – demand, liver function tests and cardiocirculatory effects in the reperfusion period during a hemihepatectomy operation with occlusion of the liver hilus. Methods: Twenty patients were studied in a randomised, doubleblind setting. They either received 2 µg/kg per min dopamine or 0.5 µg/kg per min dopexamine perioperatively. For monitoring purposes a pulmonary artery and a liver venous catheter were placed. At four different time points hemodynamic parameter were assessed and blood samples were drawn. Results: Significant changes between groups were found 5 min after opening the liver hilus for the cardiac index and the systemic oxygen delivery, as well as at the end of the operation for pulmonary shunt volume, which had increased more in the dopexamine group. No significant difference between liver venous oxygen saturation and liver function tests was found. Conclusion: Until more detailed studies concerning the influence of dopamine on the hepatic-splanchnic region during liver surgery are performed, dopexamine can not be considered superior to dopamine during these operations.
    Notes: Zusammenfassung Fragestellung: Gibt es einen Unterschied bezüglich der leber-venösen Sauerstoffsättigung, des Sauerstoffangebots und -verbrauchs, der Leberfunktion sowie der kardiozirkulatorischen Effekte während der Reperfusion zwischen niedrig dosiertem Dopamin und Dopexamin bei Leberteilresektionen mit Leberhilusokklusion? Methodik: 20 Patienten wurden randomisiert, doppelblind in zwei Gruppen eingeteilt und erhielten entweder 2 µg/kg/min Dopamin oder 0,5 µg/kg/min Dopexamin. Für das perioperative Monitoring wurden ein pulmonalarterieller- und ein Lebervenenkatheter gelegt. Zu vier Meßzeitpunkten wurden Parameter der Hämodynamik erhoben und Blut abgenommen. Ergebnisse: Ein signifikanter Unterschied zwischen den Gruppen bestand 5 min nach Eröffnung des Leberhilus in einem stärker angestiegenen Cardiacindex und systemischen Sauerstoffangebot sowie am OP-En-de in einem stärker angestiegenen pulmonalen Shuntvolumen in der Dopexamingruppe. Es gab keinen Unterschied bezüglich der leber-venösen Sauerstoffsättigung und der Leberfunktionsparameter. Schlußfolgerung: Bis weiterführende Untersuchungen mit differenzierter Betrachtung der Wirkung von Dopexamin bei leber-chirurgischen Eingriffen vorliegen, ist Dopexamin bei diesen Operationen gegenüber Dopamin nicht als überlegen zu betrachten.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0495
    Keywords: Key words Geochemistry ; Porosity ; Radioactivity ; Radon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  A steady radon exhalation is assumed in most publications. In a village of North-East Hungary, however, high radon concentrations have been measured, differing strongly in neighbouring houses and varying in time, due to the interplay of geochemical phenomena.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' journal of analytical chemistry 358 (1997), S. 240-241 
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Silica modified with benzene was investigated by infrared and solid state 13C cross-polarization magic angle spinning nuclear magnetic resonance spectroscopy (13C CP MAS NMR). Whereas infrared spectroscopy did not allow to distinguish between phenyl and polyphenyl groups, this was possible by solid state nuclear magnetic resonance spectroscopy.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' journal of analytical chemistry 358 (1997), S. 333-334 
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Thin films of silicon carbide with codeposited elemental silicon were prepared by chemical vapor deposition (CVD). In a second CVD-process a thin titanium layer was deposited on the SiC(Si) basic layer. The solid state reaction between titanium and the codeposited silicon can be observed by X-ray diffractometry. A helpful analytical method for the observation of the growth of the reaction products is grazing incidence X-ray diffractometry. Various diffraction patterns of titanium silicides can be obtained by decreasing incidence angles.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' journal of analytical chemistry 361 (1998), S. 653-655 
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Investigations on CVD boron nitride films on fibres by means of photoelectron and X-ray spectroscopy resulted in B/N ratios above the stoichiometric value 1 and oxygen contents up to 25 at%. Compared to the hydrolytic rate of the films an apparent dependence was found on the deposition rate and some evidence of the oxygen concentration. CVD fibre coatings exhibit a hexagonal turbostratic structure with extremely small atomic layer plane dimensions, which was proved by transmission electron microscopy. Corresponding to oxygen concentrations in pyrolytic carbon films with similar structure a model is proposed, where the small atomic layers with dimensions of some nanometers cause a relatively high oxygen concentration in the boron nitride films. The oxygen atoms saturate the dangling bonds. Moreover the B/N ratio extents the expected stoichiometric ratio due to the oxygen atoms at nitrogen sites.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' journal of analytical chemistry 363 (1999), S. 209-211 
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A plasma-electrochemical synthesis was used to prepare chromium and sodium tantalate layers. These layers were deposited on a tantalum anode surface as ceramic compounds from aqueous electrolytes. The typical pore structure morphology of the tantalate layer was characterised by SEM as well as fractures which provide evidence of an intimate contact between layers and substrate. An XRD-study showed that the layers are composed of a mixture of Ta2O5 and either NaTaO3 or CrTaO4 depending on the electrolyte composition. Quantitative characterisation by EPM indicated higher chromium and tantalum concentrations on the electrolyte/layer interface than at the layer/tantalum interface. The chemical state of tantalum was investigated by means of XPS.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' journal of analytical chemistry 358 (1997), S. 105-107 
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Crystalline strontium titanate layers were deposited on titanium anodes from Sr(OH)2 aqueous electrolyte solutions by a plasmachemical-electrochemical process of anodic spark deposition. X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) have been used to study the properties of the polycrystalline material. Strontium titanate was deposited on the titanium anode surface as a ceramic layer from an aqueous electrolyte. The typical pore structure morphology of the anodic spark deposit (ASD) was characterized by SEM as well as fractures which provide an intimate contact between layer and substrate. XRD-study showed that the layers are composed of a mixture of SrTiO3 and TiO2.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' journal of analytical chemistry 365 (1999), S. 255-257 
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Reinforcement effects in composites are widely influenced by fibre coatings. A detailed understanding of their microstructure and chemical composition is of great interest. Boron nitride films were deposited continuously on fibre rovings of various ceramics in CVD reactors of vertical as well as horizontal position. XPS depth profilings show that the film compositions are close to stoichiometric BN with carbon and oxygen impurities in the range of 10 at%. Cross-sections of separated fibres were investigated by HREM and TEM diffraction. All BN films are hexagonal turbostratic. The (002) layers with an increased distance (about 0.36 nm) showed a mean stacking sequence near to graphite and a characteristic orientation to the fibre in the interface region. We assume the gas flow type and hence the exchange rate of matter and energy determines the film structure in this region. With increasing film thickness the (002) layers fold randomly in all directions or form nanocrystals at elevated temperatures.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' journal of analytical chemistry 365 (1999), S. 133-135 
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The analytic characterisation of various layers and layer systems on fibrous materials are presented. The layers, deposited by an isothermal CVD process, consisting mainly of pyrolytic carbon, hexagonal boron nitride and silicon carbide were characterised by different analytical methods, especially by Raman spectroscopy [1]. The surface enhanced Raman spectroscopy (SERS) was used first time for the investigation of boron nitride (BN) coatings on fibres.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' journal of analytical chemistry 365 (1999), S. 103-105 
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A method is presented for calculating the absorption spectrum, the film thickness and the index of refraction from IR reflection spectra. Considering real test conditions (partial incoherence, scattering) a routinely usable instrument was created with this direct calculation of the absorption spectrum, which provides a very good correspondence between the measurement and simulation also without any initial information about the expected spectrum. This method is applied to characterize hard coatings deposited on iron substrates by glow discharge assisted CVD processes with organic silicon and boron compounds as precursors. In addition to the qualitative microstructural characterization of these coatings, this method is suitable for a rapid, exact and non-destructive determination of the film thickness and the index of refraction.
    Type of Medium: Electronic Resource
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