Hans-Georg Frischkorn

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A 30,000-year paleotemperature record derived from noble gases dissolved in carbon-14-dated ground water indicates that the climate in lowland Brazil (Piaui Province, 7 degrees S, 41.5 degrees W; altitude, 400 meters) was 5.4 degrees +/- 0.6 degrees C cooler during the last glacial maximum than today. This result suggests a rather uniform cooling of the(More)
Extended screening tests on the cercaricidal activity of various plants from northeast Brazil have shown that the extracts of the leaves and fruits of Piper marginatum, Protium heptaphyllum, and Capsicum annuum show a remarkable effect on the cercaria of Schistosoma mansoni. In the case of the oils of Piper marginatum and Capsicum annuum, 90--96% of the(More)
Quinine is determined quantitatively with a liquid-chromatographic method in various solutions using silica as a stationary and methanol + 0.5% ammonia as a mobile phase. The approximate concentrations of quinine were found to be between 50.0 to 72.0 mg/1 in the soft-drinks investigated. Beers, which were also investigated do not content quinine. The method(More)
A high-performance liquid chromatographic method for the determination of the free excreted anabolic drug methandienone in pharmacokinetic studies is described. After extraction of the free steroids from urine, separation on reversed-phase columns leads to quantitative determination of this drug down to 5 ng, and to qualitative detection of less than 1 ng(More)
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