https://www.selleckchem.com/products/sar131675.html nov. is proposed. The type strain is UKS-15T (=JCM 30983T=KACC 18719T).So far it has never been clearly decided whether the treatise De natura rerum constitutes an authentic work by the physician and natural philosopher Theophrastus Bombast of Hohenheim, called Paracelsus (1493/94-1541) This article outlines the manuscript and printing traditions of De natura rerum, in which a recently discovered manuscript from 1571 is identified as the earliest source. The watermarks of this manuscript refer to the Tyrolean Inn Valley, where great alchemical expertise was available due to silver mining. A detailed examination of the content and style of the preface and the nine chapters indicates the involvement of at least three different authors. Some of these parts are definitely forgeries, while others cannot be judged with certainty as to their authenticity. On the other hand, three chapters, those on death, resuscitation and the signature of natural things, are most likely real writings of Paracelsus.A scholarly consensus has long held that in redefining alchemy, Paracelsus rejected metallic transmutation. I show here, however, that for most of his career Paracelsus believed that it was possible to change one metal into another, and even late in his short life he did not break with that view. Furthermore, in certain places in his works he also represented himself, occasionally directly and more often obliquely, as a practical transmutationist. Because Paracelsus not only acknowledged that metallic transmutations were theoretically possible but also claimed to have carried them out in practice, we must regard him as (among other things) a transmutational alchemist. As such, he had more in common than historians have generally admitted with both his medieval predecessors and his posthumous followers. The Paracelsian alchemists of the late-sixteenth and seventeenth centuries were not wrong to situate Paracelsus within the alch