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  • Chemistry  (1)
  • Plasma catecholamines  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of pediatrics 150 (1991), S. 503-506 
    ISSN: 1432-1076
    Keywords: Dopamine infusion ; Newborn infants ; Plasma catecholamines ; Noradrenaline ; Adrenaline
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Newborn infants (21 preterm and 13 term) received dopamine infusions at a low (2.5–3.4 μg/kg per min) and/or high (5–10 μg/kg per min) infusion rate and changes in plasma catecholamines were monitored. The mean baseline values for dopamine, noradrenaline and adrenaline were between 240 and 560, 125 and 144 and 62 and 82 pg/ml, respectively. During low-rate infusion of dopamine, there was a significant increase in plasma dopamine (20–100fold), noradrenaline (three- to five-fold) and adrenaline (threefold). Administration of dopamine at the high rate resulted in an even larger increase in the plasma catecholamines (dopamine, 100–300fold; noradrenaline, seven- to eightfold; adrenaline, four- to sixfold). In a double-log plot, there was a highly significant correlation between the plasma concentrations of dopamine and noradrenaline (r=0.77;P〈0.001). In conclusion, infusion of dopamine in term and preterm newborn infants is accompanied by an enhanced sympatho-adrenal tone which may contribute to the cardiovascular effects of dopamine in these patients.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 27 (1996), S. 246-251 
    ISSN: 0933-5137
    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
    Description / Table of Contents: Hard Particle Dissolution and Structure of Coarsegrained Dispersion Layers on Steel Produced by Convection-reduced Laser MeltingWith the aim to produce hard and wear-resistant dispersion layers coarse grained TiC-and TiB2-particles were incorporated into the surface layers of steels by means of a two-step laser melting process with reduced melt bath convection. The influence of the carbon conent of the steel and content of alloying elements and hard particles in the screen printed layer on solidification structures and particle dissolution was investigated by optical and electron microscopy and x-ray microanalysis. The produced layers were also characterized by hardness measurements.
    Notes: Mit dem Ziel, harte und verschleißfeste Dispersionsschichten zu erzeugen, wurden in die Oberfläche von Stahlproben grobkörnige TiC- und TiB2-Partikel nach einem zweistufigen Prozeß mit Hilfe eines CO2-Leistungslasers eingeschmolzen. Die Laserbehandlung erfolgte derart, daß eine Schmelzbadkonvektion weitgehend unterdrückt werden konnte. Der Einfluß des Kohlenstoffgehaltes im Stahl sowie der Art und der Gehaltes von metallischen Zusätzen und Hartstoffen in der Vorbeschichtung auf die Hartstoffauflösung und die Ausbildung der Schichtgefüge wurde mittels Lichtmikroskopie, Rasterelektronenmikroskopie und Röngenmikroanalyse untersucht. Außerdem wurden zur Schichtcharakterisierung Härtemessungen durchgeführt.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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