Universität Stuttgart

Permanent URI for this communityhttps://elib.uni-stuttgart.de/handle/11682/1

Browse

Filters

19893

Settings

Publication Type: search.filters.UBSTyp.KonferenzbeitragInstitute: search.filters.UBSInstitut.Institut für Biomaterialien und biomolekulare SystemeStart date: 1989End date: 1989

Search Results

Now showing 1 - 3 of 3
  • Thumbnail Image
    ItemOpen Access
    Konstruktion, Leichtbau und Ökonomie bei Pflanzen
    (1989) Kull, Ulrich; Herbig, Astrid
    Die Festigkeitseigenschaften von Achsen aus Pflanzenarten unterschiedlicher Stellung werden mit Hilfe der BIO-Methode (nach F. Otto) beschrieben und zu Energiegrößen in Beziehung gesetzt. Damit lassen sich Aufwandswerte K (dirnensionslos) berechnen, die dann auf die Lebensdauer der Achsen bezogen werden. Konstruktiv gute Wirtschaftlichkeit zeigen Achsen vom Bautypus der Gräser, Blattstiele von Farnen und Achsen vom Hopfen (Liane). Der K-Wert ausdauernder Achsen liegt höher, K/Lebensdauer ist aber ähnlich wie bei einjährigen. Kurzlebige Blüten- und Fruchtstiele haben einen hohen Aufwand je Zeit. Die Größe K/Lebensdauer wird in Verbindung mit der Selektion gebracht. Vergleiche mit menschlichen Konstruktionen schließen sich an.
  • Thumbnail Image
    ItemOpen Access
    Pulsed high-power-sonication of concrements, cancer cells and rodent-tumors in vivo
    (1989) Riedlinger, Rainer E.; Brümmer, Franz; Hülser, Dieter F.
    Extracorporeal lithotripsy has been successfully established, based on different principles of generating and focusing the shock waves. Lithotripters have also been used to investigate the influence of shocks to cancer cells and solid tumors. With two different trans-mitters (spark-gap type XL-1 and piezo-resonance type MW 2) we applied shock waves and short high power US-pulses to suspended and immobilized tumor cells and multicell spheroids. With MW 2 significant local damage on cell spheroids in gelatin was achieved, caused by locally controlled cavitation. The results are compared to each other.
  • Thumbnail Image
    ItemOpen Access
    Biological effects and physical characterization of shock waves by an XL-1 experimental lithotripter
    (1989) Brümmer, Franz; Staudenraus, Joachim; Nesper, Martina; Suhr, Dierk; Eisenmenger, Wolfgang; Hülser, Dieter F.
    Extracorporeal shock wave lithotripsy (ESWL) has become the clinical standard method for non-invasive disintegration not only of concrements in kidney and urinary tract but also of gallstones. Despite the widespread clinical use of ESWL, the mechanism of stone destruction is not yet really understood, but several possibilities (cavitation, shock wave reflection) are discussed. The final cause of various side effects is still under discussion. Nevertheless, during the last few years much effort was put into possible extensions of ESWL applications On the other hand , physical characterizations of shock waves are rarely reported and combined measurements of biological effects in vitro and physical characterization of the applied shock waves are not available. We, therefore, examined the influence of water temperature and gas content on the shock wave efficency in biological systems and determined several physical characteristics (pressure amplitudes, rise time etc.) of the shock waves under the same experimental conditions.