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Journals and Conferences
Dental alloys are metallic biomaterials which have a broad variation of composition compared to technical alloys. It is therefore in the interest of patients and technicians to conduct a good assessment of the electrochemical behaviour of dental alloys in order to collect information about their corrosion resistance. The purpose of this work was to… (More)
Four alkaloids have been isolated from the skin gland of the ‘Feuer- and Alpensalamander’ (Salamandra maculosa andatra Laur.). The structure, stereochemistry and absolute configuration of the principal alkaloid, samandarin, have been elucidated by chemical, optical, and X-ray-crystallographic methods. The basic structure of samandarin is derived from… (More)
It is shown thatSedum acre L. collected near Darmstadt contains an alkaloid Sedridin C8H17ON, while in the literature a sample of the plant collected in Canada showed a content of Sedamin (C14H21ON) and Nicotine. The constitution of Sedridin has been proved and its biogenesis is discussed.
A new way of formation ofN-methyl-pavine fromN-methyl-1,2-dihydro-papaverine is described. New structural formulæ for pavine are brought forward as well as the reaction mechanism is cleared up with regard to its formation by the reduction of papaverine with tin and hydrochloric acid.
y-HgaS~CI= erhielten wir beim Abschrecken yon HgSund HgCl~-Dampf yon e twa 750 ~ C o d e r in termedigr bei der Umsetzung einer schwach alkalischen HgCl~-LOsung mit CS~. Die rhombische Elementarzelle m i t a = 9,09~ ; b = 16,84 a ; c : 9,3% A enth~Llt 8 Formeleinheiten. Als R a u m g r u p p e n kommen ill Frage D ~ C m m m ; D~ C222; z4 C2~ C m 2 m ; C~lv… (More)