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  • 1
    Digitale Medien
    Digitale Medien
    CO oxidation catalyzed by Cu‐exchanged zeolites: a density functional theory study (1999)
    Springer
    Catalysis letters 61 (1999), S. 179-186 
    Details
    ISSN: 1572-879X
    Schlagwort(e): CO oxidation ; Cu‐ZSM‐5 ; zeolites ; DFT
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The catalytic oxidation of CO by Cu‐exchanged high‐silica zeolites (e.g., ZSM‐5) has been investigated theoretically using density functional theory. Calculations reveal two distinct, parallel pathways for oxidation of CO: (i) adsorption of O2= on a reduced Cu site followed by O atom abstraction by CO, and (ii) adsorption of CO followed by its reaction with O2= to form a cyclic compound which decomposes to form CO2=. The reduced site is regenerated via two different pathways, both of which involve oxidation of one or more CO molecules: (i) abstraction of atomic oxygen by CO from the oxidized active site, and (ii) formation of a carbonate species followed by its reaction with a molecule of CO. The relevance of these reactions to the reduction of NO is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1019053729010
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  • 2
    Digitale Medien
    Digitale Medien
    Hypoglossal nerve injury as a complication of anterior surgery to the upper cervical spine (1999)
    Springer
    European spine journal 8 (1999), S. 78-80 
    Details
    ISSN: 1432-0932
    Schlagwort(e): Key words Cervical spine ; Surgery ; Neurologic complication ; Hypoglossal nerve
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Injury to the hypoglossal nerve is a recognised complication after soft tissue surgery in the upper part of the anterior aspect of the neck, e.g. branchial cyst or carotid body tumour excision. However, this complication has been rarely reported following surgery of the upper cervical spine. We report the case of a 35-year-old woman with tuberculosis of C2–3. She underwent corpectomy and fusion from C2 to C5 using iliac crest bone graft, through a left anterior oblique incision. She developed hypoglossal nerve palsy in the immediate postoperative period, with dysphagia and dysarthria. It was thought to be due to traction neurapraxia with possible spontaneous recovery. At 18 months’ follow-up, she had a solid fusion and tuberculosis was controlled. The hypoglossal palsy persisted, although with minimal functional disability. The only other reported case of hypoglossal lesion after anterior cervical spine surgery in the literature also failed to recover. It is concluded that hypoglossal nerve palsy following anterior cervical spine surgery is unlikely to recover spontaneously and it should be carefully identified.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s005860050131
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