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  • 1
    Electronic Resource
    Electronic Resource
    Oxidative dehydrogenation of ethane by carbon dioxide over sulfate‐modified Cr2O3/SiO2 catalysts (1999)
    Springer
    Catalysis letters 63 (1999), S. 59-64 
    Details
    ISSN: 1572-879X
    Keywords: ethane dehydrogenation ; ethylene ; CO2 ; Cr2O3 ; sulfated silica
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The oxidative dehydrogenation of ethane into ethylene by carbon dioxide over unsupported Cr2O3, Cr2O3/SiO2 and a series of Cr2O3/SiO2 catalysts modified by sulfate was investigated. The results show that Cr2O3/SiO2 is an effective catalyst for dehydrogenation of ethane and CO2 in the feed promotes the catalytic activity. Sulfation of silica will influence the catalytic behavior of Cr2O3/SiO2 in dehydrogenation of ethane with carbon dioxide depending on the amount of sulfate. Cr2O3/6 wt% SO 4 2- –SiO2 catalysts exhibit an excellent performance for this reaction, giving an ethylene yield of 55% at 67% ethane conversion at 650°C. Characterizations indicate that addition of sulfate changes the bulk and surface properties of Cr2O3/SiO2, promoting the reduction of Cr6+ to Cr3+ and favoring the catalytic conversion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019084030344
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    High-salt solutions prevent reactivation of euglenoid movement in detergent-treated cell models ofEuglena gracilis (1998)
    Springer
    Protoplasma 203 (1998), S. 125-129 
    Details
    ISSN: 1615-6102
    Keywords: Membrane cytoskeleton ; Euglena gracilis ; Cell movement ; Metaboly ; Cell shape
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Detergent-treated cell models ofEuglena gracilis showed rounded-up movement of the cell body upon addition of ATP and Ca2+. Reactivation of the cell models was inhibited when the cell models had been treated with solutions containing 〉150 mM NaCl or 〉300 mM KC1. When the supernatant of salt-extracted cell models was subjected to sodium dodecyl sulfate-polyacrylamide gel electrophoresis, two distinctive bands of 120 and 160 kDa were found to be enriched. The cell membrane and associated cytoskeleton (pellicular complex) were isolated after treatment with salt solutions, and examined by electron microscopy to identify essential cortical structures required for reactivating rounding-up cell movement. Among three regularly arranged microtubules, only one and its associated structures were selectively dissolved from the pellicular strips, while the other pellicular elements remained intact. These structures were located in the groove region where sliding between strips is believed to occur during cell shape change. These results suggest a possible involvement of microtubule 2 and its associated bridges in active sliding between adjacent pellicular strips during euglenoid movement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01279468
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    Paper (German National Licenses)
    Fulltext
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