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  • Fixateur externe  (2)
  • 4.5 or 7 mm Screw-pin  (1)
  • 7-Ethoxycoumarin-O-deethylase  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Activity of aldrinepoxidase, 7-ethoxycoumarin-O-deethylase and 7-ethoxyresorufin-O-deethylase during the development of chick embryos in ovo (1990)
    Springer
    Archives of toxicology 64 (1990), S. 128-134 
    Details
    ISSN: 1432-0738
    Keywords: Chick embryo ; Yolk sac ; Mixed-function oxidase MFO ; Metabolic activation ; Aldrinepoxidase ; 7-Ethoxycoumarin-O-deethylase ; 7-Ethoxyresorufin- O-deethylase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Since the chick embryoin ovo is susceptible to the action of some agents needing metabolic activation we studied the development of the activity of cytochrome P450-dependent monooxygenases in embryo/fetal tissue. The activities of aldrinepoxidase (AE), 7-ethoxycoumarin-O-deethylase (ECOD) and 7-ethoxyresorufin-O-deethylase (EROD) were measured in whole embryos, liver and yolk sac tissue of the chick embryo during developmentin ovo from day 4 to day 15 of incubation (DI). In yolk sac tissue enzyme activities could be detected from DI 4 on. While EROD activity was only marginally developed, AE and ECOD activities were more pronounced in the earlier developmental period and showed a clear decrease by the time the liver activities rose. With the methods used AE activity could be measured in the homogenate of the whole embryo proper from DI 4 on while EROD and ECOD activity was not detectable before DI 6 or DI 7, respectively. In liver tissue enzyme activities of the three monooxygenases studied developed to a considerable degree from DI 9 on and tended to exhibit maximum values around DI 11–13. Studies on monooxygenase activities in extra-embryonically located tissues have not been published until now. The importance of the yolk sac as a metabolically relevant organ during embryogenesis is pointed out in this study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01974398
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    421. Möglichkeiten der Stabilitätserhöhung oder Implantatreduktion beim Fixateur externe durch modifizierte Schanzsche Schrauben (1983)
    Springer
    Langenbeck's archives of surgery 361 (1983), S. 939-939 
    Details
    ISSN: 1435-2451
    Keywords: External fixator ; Modified Schanz screws ; Increased stability ; Reduced number of implants ; Fixateur externe ; Modifizierte Schanzsche Schrauben ; Höhere Stabilität ; Reduktion der Implantatanzahl
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In einer experimentellen Untersuchung wurden verschiedene Fixateur externe-Montagen an Frakturmodellen unter exzentrischer Belastung hinsichtlich ihrer Bewegungen am Bruchspalt verglichen. Dabei zeigte ein Aufbau mit 4 modifizierten 5/8-mm-Schanzschen-Schrauben in der lateralen Klammer eines Oberschenkelfixateurs Typ III eine höhere Stabilität als eine Konstruktion mit 6 herkömmlichen 5-mm-Schrauben. Daraus schließen wir, daß der Einsatz unserer modifizierten Schanzschen Schrauben die Möglichkeit der Implantatreduktion bei gleichzeitiger Festigkeitserhöhung bietet.
    Notes: Summary In an experimental study we compared different constructions of external fixators in bone models under excentric load with reference to the movements in the fracture space. Four modified Schanz screws 5/8 mm in diameter in the lateral bracket of a type-III femur fixator gave even greater stability than a construction with six normal 5-mm screws. We conclude that if our modified Schanz screws are used in external fixation the number of implants can be reduced while the stability is rendered even greater.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01276247
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    156. Stabilere Fixateur externe Osteosynthesen durch Einsatz eines neu entwickelten Schraubennagels (1982)
    Springer
    Langenbeck's archives of surgery 358 (1982), S. 486-486 
    Details
    ISSN: 1435-2451
    Keywords: External fixation ; 4.5 or 7 mm Screw-pin ; 5 or 8 mm Schanz screw ; Fixateur externe ; 4,5 bzw. 7 mm Schraubennagel ; 5 bzw. 8 mm Schanzsche Schraube
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Frühere Untersuchungen hatten gezeigt, daß die bisher verwendeten 4,5 mm Steinmann-Nägel mit zentralem Gewinde die schwächsten Teile der Fixateur externe Systeme darstellen. Daher entwickelten wir einen abgesetzten Schraubennagel (4,5 bzw. 7 mm) mit AO-Corticalisgewinde. In experimentellen Untersuchungen waren Montagen mit neuen Schraubennägeln bis zu 40% stabiler als vergleichbare Montagen mit normalen Steinmann-Nägeln. Erste klinische Anwendungen waren erfolgreich. In Analogie zu unserem Nagel wurde eine modifizierte Schanzsche Schraube (5 bzw. 8 mm) entwickelt.
    Notes: Summary Investigations have shown that the normal 4.5 mm Steinmann-nails with a central thread are the weakest part of external fixation systems. Therefore we developed a 4.5 or 7 mm screw-nail with the thread of AO cortical screws. In experimental studies we found that mounting forms with the new screw-nails were up to 40% more stable in comparison to those with conventional Steinmann pins. First clinical trials were successful. In analogy to our screw-nail we developed a modified Schanz screw (5 or 8 mm diameter).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01271902
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    Paper (German National Licenses)
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