1. Some aspects of amino acid metabolism in the fruiting myxobacterium, Myxococcus xanthus

   • Charles W. Hanson
   • Anthony J. Andreoli

   OriginalPaper Pages: 1 - 10

2. Germanium incorporation into the silica of diatom cell walls

   • Farooq Azam
   • Barbara B. Hemmingsen
   • Benjamin E. Volcani

   OriginalPaper Pages: 11 - 20

3. Further enzymic studies and electron microscopy of the microbodies of a mutant of Chlorella vulgaris

   • Geoffrey A. Codd
   • Georg H. Schmid
   • Wolfgang Kowallik

   OriginalPaper Pages: 21 - 38

4. Particle aggregation and phagotrophy by Ochromonas

   • S. Aaronson

   OriginalPaper Pages: 39 - 44

5. Rhodopseudomonas sulfidophila, nov. spec., a new species of the purple nonsulfur bacteria

   • T. A. Hansen
   • H. Veldkamp

   OriginalPaper Pages: 45 - 58

6. Nitrogen fixation by the unicellular blue-green alga Aphanothece

   • P. K. Singh

   OriginalPaper Pages: 59 - 62

7. Spezifischer Abbau von Octopin und Arginin durch virulente Agrobacterium tumefaciens B6

   • H. Schupik
   • R. Beiderbeck

   OriginalPaper Pages: 63 - 68

8. A study of copulation, sporulation and meiotic segregation in Candida lipolytica

   • Claude M. Gaillardin
   • Véronique Charoy
   • Henri Heslot

   OriginalPaper Pages: 69 - 83

9. Localization of extranuclear genes by investigations of the ultrastructure in Chlamydomonas reinhardii

   • W. Behn
   • C. G. Arnold

   Short Communications Pages: 85 - 90