Cephalostatin Analogues - Synthesis and Biological Activity (Timo Flessner/Rolf Jautelat/Ulrich Scholz/Ekkehard Winterfeldt) Introduction . Synthesis of Bissteroidal Pyrazines . A-D-Ring Functionalization . The Spiroketal Area of Cephalostatins, Summary . Acknowledgements . References Siderophores of the Pseudomonadaceae sensu stricto (Fluorescent and Non-Fluorescent Pseudomonas spp.) (Herbert Budzikiewicz) Introduction . The Typical Siderophores of the Fluorescent Pseudomonads - the Pyoverdins . Other Siderophores of Fluorescent Pseudomonads . Iron Sequestering . Pseudomonas and Health . Pseudomonas and Agriculture . Pseudomonas and Environmental Problems . Acknowledgements . Abbreviations . Appendices: Bacterial Species, Bacterial Culture Collections . References: Books, Chapters and Review Articles, Original Publications Author Index Subject Index