Christina Hesselmann

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Within the fully coupled multiphysics phonation process, the fluid flow plays an important role for sound production. This study addresses phenomena in the flow downstream of synthetic self-oscillating vocal folds. An experimental setup consisting of devices for producing and conditioning the flow including the main test channel was applied. The(More)
Glyoxylic acid is the toxic principle of acquired and inherited oxalurias. A "chemical", not enzyme-mediated detoxication concept for the trapping of this aldehyde is described, based on a spontaneous formation of alkaloid-type heterocycles by reaction with biogenic amines or amino acids. 5,5-Dimethylthiazolidine-2(R,S)-4(S)-dicarboxylic acid, prepared by(More)
Reversed-phase ion-pair chromatography, using cetyltrimethyl ammonium hydrogensulphate as detergent, has been applied to the analysis of the highly polar glyoxylate-derived 1,3-thiazolidines 1, 2 and 3. On the base of this high-performance liquid chromatographic separation of the diastereomeric compounds 1a/b and 3a/b was achieved. Removal of the(More)
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