Acupuncture analgesia and cesarean section

The application of acupuncture anesthesia in obstetrics is discussed and reviewed. Of 14 patients delivered by cesarean section under acupuncture, 8 (57%) felt no pain, and 6 did not go through the entire procedure without other supplementary anesthesia. The failure and success rates are reviewed. It is suggested that the technique be evaluated further because with acupuncture the fetus and mother are completely protected from the secondary effects of general regional anesthesia.     

Zum Mechanismus der Erosionskorrosion in schnell strömenden Flüssigkeiten

Mechanism of erosion corrosion in fast flowing liquids The corrosion behaviour of copper, brass and gray cast iron has been studied in 3 % air-saturated NaCl solution and seawater respectively. The tests have been carried out in an experimental setup enabling a circular Couette type flow to be formed. At low and very high rates the corrosion rate clearly depends from the flow. Above certain critical flow rates the attack is localized and erosion corrosion is found at high turbulence spots. By electrochemical methods the particular corrosion rates are determined and it is shown, that the cathodic partial corrosion reaction is rate-controlling. The origin of mechanical interaction between the medium and the metal surface, but also to processes occurring within the covering layer. Erosion corrosion consequently depends from flow conditions and surface properties and also from type and stability of the surface layers.