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  • Neonatal intensive care  (1)
  • active phase-support interaction  (1)
  • bifunctional mechanism  (1)
  • 1
    ISSN: 1572-879X
    Keywords: dry reforming of methane ; temporal analysis of products (TAP) ; isotopic transient kinetic experiments ; bifunctional mechanism ; MgO-promoted ruthenium catalysts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The addition of MgO to a ruthenium catalyst dispersed on an inert activated carbon is found to improve the catalyst selectivity and stability in the dry reforming of methane to syngas. Steady-state and isotopic transient kinetic experiments carried out in a TAP reactor have revealed a cooperative interaction between the metal and the basic oxide in the CO2/CH4 reaction via a bifunctional mechanism. This specific effect is proposed to explain the discovered promoting effect.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1572-879X
    Keywords: rhodium ; rhodium-alumina ; active phase-support interaction ; hydrogenation of crotonaldehyde ; temperature-programmed reduction ; XANES
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The effects of the rhodium (oxidation) state on the activity and selectivity for the crotonaldehyde hydrogenation reaction over Rh/Al2O3 and Rh/SiO2 catalysts were examined using the techniques of temperature-programmed reduction, hydrogen chemisorption and X-ray absorption near-edge structure (XANES). In the alumina-supported system, the active phase-support interaction is shown to affect the chemical behavior of rhodium under the influence of a reductive atmosphere by stabilizing Rh3+ species. This behavior is not observed (as expected) for Rh/SiO2 catalysts. The structural and electronic bases of the active phase-support interaction and the effect of the latter phenomenon on the hydrogenation of crotonaldehyde are discussed.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1076
    Keywords: Keywords Portal vein thrombosis ; Umbilical catheterization ; Exchange transfusion ; Neonatal intensive care ; Colour Doppler
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The aetiopathology of extrahepatic portal vein obstruction is unknown. In retrospective studies, umbilical vein cannulation and sepsis have been alleged to cause portal thrombosis. This prospective study was undertaken to detect whether thrombosis and consequent obstruction of the splenoportal venous system develops after umbilical vein catheterization for exchange transfusion in newborns using Doppler ultrasound. Forty children (M = 24; F = 16) who had undergone exchange transfusion for hyperbilirubinaemia were studied at school age. Maximal duration of the venous umbilical cannulation was 120 min and sepsis did not occur. Clinical, biological and sonographic examinations were normal, except in 3 children. In 2 the left branch of portal vein could not be identified (normal variant). Conclusion Our results show that, in these children, umbilical vein catheterization did not lead to development of portal vein thrombosis. However, when other risk factors such as umbilical infection, traumatic catheterization are associated, children should be screened for obstruction of the portal vein.
    Type of Medium: Electronic Resource
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