Biomedical subjects
Publications and source records attributed to G Konrad.
Highenergy shock waves can desintegrate human calculi of the kidney into fine fragments without direct contact. A closed reflector system which allows sterile contact with the exposed kidney is presented.
The determination of alpha-amino nitrogen (alpha-AN) is performed via the formation of amino acid copper complexes and subsequent colorimetric estimation of the dissolved copper as copper diethyldithiocarbamate. The continuous colour reaction by means of an auto-analyzer increases the reliability of the measured values (variation coefficient = 1.7%) compared to the laborious manual method. The stability of the amino acid copper complexes and of copper diethyldithiocarbamate was verified and possible interferences with the colour reaction were discussed. Ammonia does not interfere with the determination of alpha-AN in protein hydrolysates, whereas traces of detergent residues bias the measured values.
High titer cold agglutinins (CA) after rubella infection are reported. When the rubella exanthema disappeared the clinical aspect of a cold agglutinin disease was observed. Three weeks after the appearance of the cutaneous eruption the CA titer reached a maximum of 1/8000, to then continuously fall off to normal values within 20 weeks. Double diffusion tests showed that the isolated CA were IgM proteins that possess only chi-type light chains. In spite of normal protein- and immunoelectrophoresis patterns obtained with whole serum samples, the isolated CA showed restricted electrophoretic mobility and a deformation of the precipitate typical for monoclonal immunoglobulins. In contrast to the common anti-I specificity of IgM CA, the IgM CA described showed anti-Pr specificity. Possible interrelations between CA specificities and types of germs inducing reactive cold agglutination are discussed.
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