Structure and biosynthesis of the ergot pigments

In addition to the well known alkaloids, ergot contains two groups of yellow to red pigments, between which there is a close and novel biogenetic relation. The pigments are anthraquinonecarboxylic acids and dimeric hydroxanthone derivatives (ergochromes), the structures of which, including the absolute configurations at 80 centers of chirality, have been completely determined. The intermediates involved in the biosynthesis have been largely established by feeding with labeled precursors, and its course by model experiments.     

Zur Berechnung der Feldstärke in einem stromdurchflossenen,zylindrischen Entladungsplasma

A method is presented to evaluate the electrical field in a cylindrical low pressure discharge plasma within a consistent quasineutral model. By comparing with a non quasineutral model the limits of applying a quasineutral model are fixed. An iteration procedure is given to evaluate the electrical field for cylindrical plasmas of finite length. The procedure is applied on special models. It resulted, that also at vessels with insulating walls the radial currents generally don't run ambipolar from the axis to the walls. The deviation from ambipolar running can be determined quantitatively.