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  • 1
    Electronic Resource
    Electronic Resource
    Spontane vertebrale arteriovenöse Fistel Nachweis und Therapiekontrolle mit der farbkodierten Duplexsonographie (1999)
    Springer
    Der Nervenarzt 70 (1999), S. 359-362 
    Details
    ISSN: 1433-0407
    Keywords: Schlüsselwörter Arteriovenöse Fistel ; A. vertebralis ; Duplexsonographie ; Endovaskuläre Embolisation ; Schwindel ; Key words Arteriovenous fistula ; Vertebral artery ; Duplex sonography ; Endovascular embolization ; Vertig
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Spontaneous or traumatic arteriovenous fistulae between vertebral artery and the surrounding venous plexus may cause vertebrobasilar hypoperfusion by steal effects. We report on a 71-year-old man presenting with vertigo. Duplex sonography revealed a vertebral arteriovenous fistula at the C4/5 level with the typical perivascular color Doppler artifact and hyperperfusion in the supplying arteries and draining veins. Angiography confirmed the findings; the consequently performed endovascular embolization using platin coils and silicon balloon removed the symptoms immediately. Ultrasonographic follow-up examinations within 5 months demonstrated the success of therapy showing only low-flow fistula yet. This case demonstrates that early detection of a vertebral arteriovenous fistula by duplex sonography is highly beneficial because efficient treatment modalities are available.
    Notes: Zusammenfassung Spontane oder traumatische arteriovenöse Fisteln zwischen der A. vertebralis und dem umgebenden Venenplexus können durch Steal-Effekte Schwindel und andere Symptome einer vertebrobasilären Mangeldurchblutung hervorrufen. Sie werden sehr selten diagnostiziert. Wir berichten über einen 71jährigen Patienten, der wegen Schwindels stationär untersucht wurde. Die Duplexsonographie ergab den Befund einer vertebralen arteriovenösen Fistel in Höhe C4/5 rechts mit dem typischen perivaskulären Farb-Doppler-Artefakt sowie Nachweis einer Mehrdurchströmung in den zuführenden Arterien und drainierenden Venen. Der Befund wurde angiographisch bestätigt. Die daraufhin durchgeführte endovaskuläre Embolisation mit Platin-Coils und Siliconballon beseitigte die Symptome schlagartig. Sonographische Kontrollen in den folgenden 5 Monaten bestätigten den Erfolg der Behandlung: die Fistel war zwar weiterhin nachweisbar, sie wies aber nur noch ein geringes Shuntvolumen auf. Der Fall zeigt den Wert der frühzeitigen sonographischen Diagnosestellung einer vertebralen arteriovenösen Fistel, da effektive Behandlungsmöglichkeiten zur Verfügung stehen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001150050449
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  • 2
    Electronic Resource
    Electronic Resource
    Biodegradation of biphenyl by the ascomycetous yeast Debaryomyces vanrijiae (1998)
    Springer
    Applied microbiology and biotechnology 50 (1998), S. 364-368 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Cells of the yeast strain Debaryomyces vanrijiae SBUG 770, grown with glucose, converted biphenyl to 4-hydroxybiphenyl as the major metabolite. In addition, 2-hydroxybiphenyl was formed in minor amounts. No further degradation of these substances was detected. However, these monohydroxylated derivatives were oxidised by alkane-grown cells in the presence of the co-metabolic substrate, tetradecane. Under these conditions 2-hydroxybiphenyl was oxidised to 2,5-dihydroxybiphenyl, and 4-hydroxybiphenyl was rapidly metabolised by formation of two major metabolites. One was identified as 3,4-dihydroxybiphenyl. Characterisation of the second product as 4-phenylmuconolactone points to a further metabolism of the initially formed dihydroxylated biphenyl via ortho-ring fission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530051305
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Methyl ketone formation during degradation of phenoxybutyric acid by Penicillium canescens SBUG-M 1139 (1999)
    Springer
    Archives of microbiology 172 (1999), S. 417-420 
    Details
    ISSN: 1432-072X
    Keywords: Key wordsPenicillium canescens ; Moulds ; Methyl ¶ketones ; Phenoxybutyric acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Penicillium canescens SBUG-M 1139 was shown to be able to grow using phenoxybutyric acid as the sole carbon source. The rapid conversion of the phenoxyalkanoic acid resulted in the formation of phenol, which was metabolized completely. These reactions were accompanied by an accumulation of the methyl ketone phenoxypropan-2-one. Furthermore, during the metabolism of phenoxybutyric acid, 4-phenoxy-2,3-dehydrobutyric acid, 4-phenoxy-3-hydroxybutyric acid, phenoxyacetic acid, and phenoxypropan-2-ol accumulated in minor amounts. Clearly, fungi can metabolize phenoxyalkanoic acids to produce methyl ketones in a manner analogous to that used for the conversion of short- or medium-chain fatty acids by fungi.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002030050779
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    Paper (German National Licenses)
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