Die Transformation von Burkill-Unterteilungsintegralen

Ohne ZusammenfassungDiese Arbeit enthält einen Teil der Ergebnisse der von der Fakultät für Naturwissenschaften I der Universität Fridericiana Karlsruhe (TH) im WS 1966/67 angenommenen Habilitationsschrift des Verfassers.     

On the use of the saha-eggert equation for quantitative sims analysis using argon primary ions

Samples of known composition have been bombarded by Ar⁺ ions. The resulting secondary ion mass spectra, obtained with two different types of SIMS instruments, were used to check the validity of the Saha-Eggert equation for the case of Ar⁺ ion bombardment.     

Minkowski-Ebenen Gerader Ordnung

Ohne Zusammenfassung     

Iodine Oxidation of S-Trityl- and S-Acetamidomethyl-cysteine-peptides Containing Tryptophan: Conditions Leading to the Formation of Tryptophan-2-thioethers

Cystine peptides are conveniently prepared from S-acetamidomethyl- or S-trityl-protected cysteine derivatives by direct oxidation with iodine. Since the reaction proceeds through the formation of sulfenyl iodides, these highly reactive groups may substitute the indole ring of tryptophan residues, resulting in the formation of 2-thioethers. During the synthesis of the peptide hormone somatostatin, we investigated this possible side reaction. By-products of the tryptophan-2-thioether type can be produced under conditions which lead to a marked retardation of the disulfide bond formation. The largest amount of these compounds were formed when the oxidation was carried out in 90% aqueous trifluoroethanol. In model peptides in which tryptophan and cysteine residues were separated by 1 to 4 glycine residues, the ring size of the resulting thioether exerted a strong influence on the yield: in peptides with 1 and 2 glycines, only dimeric disulfides were formed. Incorporation of 3 and 4 glycine residues gave thioethers in yields of about 40% and 70% respectively. Conversely, under normal conditions of iodine oxidation, when disulfides are rapidly formed from the S-acetamidomethyl- or S-tritylcysteine residues, tryptophan-2-thioethers are produced only in insignificant amounts or not at all.     

Über die Integration einer invarianten Funktion über eine kompakte Liesche Gruppe

Ohne Zusammenfassung     

Integralwertmengen bei Maßfortsetzungen

Ohne Zusammenfassung     

Neue Methode zur Bestimmung von Riboflavin im Harn

Ohne Zusammenfassung

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New method for the determination of riboflavine in urine