1. Guest editorial

   • Birgitte Kiær Ahring

   EditorialNotes Pages: 261 - 262

2. Extremely thermophilic cellulolytic anaerobes from icelandic hot springs

   • Sylvia Bredholt
   • Indra M. Mathrani
   • Birgitte K. Ahring

   OriginalPaper Pages: 263 - 271

3. Alanine as an end product during fermentation of monosaccharides byClostridium strain P2

   • Jóhann Örlygsson
   • Rolf Anderson
   • Bo H. Svensson

   OriginalPaper Pages: 273 - 280

4. Role of formate and hydrogen in the degradation of propionate and butyrate by defined suspended cocultures of acetogenic and methanogenic bacteria

   • Alfons J. M. Stams
   • Xiuzhu Dong

   OriginalPaper Pages: 281 - 284

5. Isomerization ofn- andi-butyrate in anaerobic methanogenic systems

   • I. Angelidaki
   • B. K. Ahring

   OriginalPaper Pages: 285 - 291

6. Sulfate reduction by a syntrophic propionate-oxidizing bacterium

   • Bernardina L. M. Van Kuijk
   • Alfons J. M. Stams

   OriginalPaper Pages: 293 - 296

7. Characterization of microbial communities in anaerobic bioreactors using molecular probes

   • Lutgarde Raskin
   • Dandan Zheng
   • Pavitra Misra

   OriginalPaper Pages: 297 - 308

8. The effect of sulfate and nitrate on methane formation in a freshwater sediment

   • Johannes C. M. Scholten
   • Alfons J. M. Stams

   OriginalPaper Pages: 309 - 315

9. Stimulation of conversion rates and bacterial activity in a silage-fed two-phase biogas process by initiating liquid recirculation

   • Åsa Jarvis
   • Åke Nordberg
   • Bo H. Svensson

   OriginalPaper Pages: 317 - 327

10. Different types of sludge granules in UASB reactors treating acidified wastewaters

    • Jullapong Thaveesri
    • Daniele Daffonchio
    • Willy Verstraete

    OriginalPaper Pages: 329 - 337

11. Granulation in thermophilic upflow anaerobic sludge blanket (UASB) reactors

    • Jens Ejbye Schmidt
    • Birgitte Kiær Ahring

    OriginalPaper Pages: 339 - 344

12. Announcements

    Announcement Pages: i - ii