The pharmacokinetics of vinorelbine has been investigated by a new HPLC method in 8 cancer patients receiving 8 weekly doses (30 mg.m-2) administered by brief infusion (15 min). The plasma concentration-time curves showed a tri-exponential decay with a long terminal half-life (44.7 h) and a high volume of distribution (Vz = 75.61.kg-1). The concentrations after the 8th infusion were significantly lower than after the 1st infusion, but without significant modification of CL (1.28 l.h-1.kg-1) or AUC (0.80 mg.l-1.h). The pharmacokinetic parameters exhibited wide interindividual variations. The results are consistent with those of previous RIA studies, although the HPLC method appears to be more specific and more precise.
Kaltgefertigte Hohlprofile europäischer Hersteller weisen in der Regel bessere Zähigkeitseigenschaften auf als in DIN EN 10219 gefordert. Gleichwohl treten häufig Schwierigkeiten beim Einsatz kaltgefertigter Hohlprofile auf, da die Nachweisregeln zur Stahlgütewahl nach DIN EN 1993-1-10 dafür nicht anwendbar sind. Deswegen wurde ein Bemessungskonzept zur Stahlgütewahl entwickelt, welches auf realen Zähigkeitsmessungen an kaltgefertigten Hohlprofilen und effektiver Dehnungen beruht. Diese plastischen Dehnungen in den gebogenen Bereichen können zu einem Abfall der Materialzähigkeit führen. Für kreisförmige und rechteckige kaltgefertigte Hohlprofile wurde infolgedessen ein Verschiebungsterm ΔT cf zur Berücksichtigung dieser Zähigkeitsreduktion in Analogie zum temperaturbasierten Sprödbruchkonzept in DIN EN 1993-1-10 abgeleitet.Toughness performance of cold-formed structural hollow sections for low temperatures. European cold-formed hollow sections in general exhibit better toughness properties than required by EN 10219. However, limits in applying the toughness related rules for the choice of steel material in EN 1993-1-10 to cold-formed hollow sections still constitute barriers to free marketing. An assessment procedure has been developed which is based on toughness measurements and effective strains. Such plastic strains may occur in the bent areas associated with a toughness reduction. For the degradation of these toughness properties an appropriate temperature shift ΔT cf has been derived for both circular and rectangular hollow sections.
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