1. Mechanisms of dominance: coexistence of picocyanobacterial genotypes in a freshwater ecosystem

   • C. Postius
   • Anneliese Ernst

   Mini-review Pages: 69 - 75

2. Two modes of sulfite oxidation in the extremely thermophilic and acidophilic archaeon Acidianus ambivalens

   • Peter Zimmermann
   • Simone Laska
   • A. Kletzin

   Original paper Pages: 76 - 82

3. Specific detection of different phylogenetic groups of chemocline bacteria based on PCR and denaturing gradient gel electrophoresis of 16S rRNA gene fragments

   • J. Overmann
   • M. J. L. Coolen
   • Christian Tuschak

   Original paper Pages: 83 - 94

4. Thermococcus waiotapuensis sp. nov., an extremely thermophilic archaeon isolated from a freshwater hot spring

   • Juan M. González
   • D. Sheckells
   • F. T. Robb

   Original paper Pages: 95 - 101

5. Antibody responses against flagellin in mice orally immunized with attenuated Salmonella vaccine strains

   • Maria Elisabete Sbrogio De Almeida
   • Salete M. Newton
   • Luís Carlos S. Ferreira

   Original paper Pages: 102 - 108

6. Characterization of the molybdate transport system ModABC of Staphylococcus carnosus

   • Heike Neubauer
   • Iris Pantel
   • F. Götz

   Original paper Pages: 109 - 115

7. Chlorobium ferrooxidans sp. nov., a phototrophic green sulfur bacterium that oxidizes ferrous iron in coculture with a “Geospirillum” sp. strain

   • Silke Heising
   • Lothar Richter
   • B. Schink

   Original paper Pages: 116 - 124

8. Fractionation of sulfur isotopes during dissimilatory reduction of sulfate by a thermophilic gram-negative bacterium at 60 °C

   • M. E. Böttcher
   • S. M. Sievert
   • Jan Kuever

   Short communication Pages: 125 - 128

9. Erratum: Arch Microbiol (1999) 171 : 405–416

   Pages: 129 - 129

10. Erratum: Arch Microbiol (1999) 172 : 45–50

    Pages: 130 - 130