1. Editorial

   EditorialNotes Pages: iii - iii

2. Aerobic denitrification in various heterotrophic nitrifiers

   • L. A. Robertson
   • R. Cornelisse
   • J. G. Kuenen

   OriginalPaper Pages: 289 - 299

3. The effect of thiosulphate and other inhibitors of autotrophic nitrification on heterotrophic nitrifiers

   • Lesley A. Robertson
   • Ronald Cornelisse
   • J. Gijs Kuenen

   OriginalPaper Pages: 301 - 309

4. Formate dependent nitrate and nitrite reduction to ammonia by Citrobacter freundii and competition with denitrifying bacteria

   • Bert Rehr
   • Jobst-Heinrich Klemme

   OriginalPaper Pages: 311 - 321

5. Motile aeromonas infection of striped (grey) mullet Mugil cephalus

   • M. K. Soliman
   • M. El. S. Easa
   • F. M. Hetrick

   OriginalPaper Pages: 323 - 335

6. Regulation of the lysine biosynthesis in Pichia guilliermondii

   • Heike Schmidt
   • Rüdiger Bode
   • Dieter Birnbaum

   OriginalPaper Pages: 337 - 347

7. Coenzyme Q systems in ascomycetous black yeasts

   • Y. Yamada
   • Kazue Sugihara
   • G. S. De Hoog

   OriginalPaper Pages: 349 - 356

8. Galactosyl residue in exopolysaccharide from Rhizobium meliloti JJ-1 exposed to manganese is furanoid

   • Vasu D. Appanna

   OriginalPaper Pages: 357 - 360

9. Chemoattractant activity of Staphylococcus aureus serine proteinase modified human plasma α-1-proteinase inhibitor

   • Krystyna Baran
   • Maria Górka
   • Zofia Porwit-Bóbr

   OriginalPaper Pages: 361 - 365