1. Important note to subscribers

   Announcement Pages: 297 - 297

2. Pathway of propionate formation in Desulfobulbus propionicus

   • Alfons J. M. Stams
   • Diderik R. Kremer
   • Theo A. Hansen

   Erratum Pages: 298 - 298

3. Acknowledgements to referees

   Acknowledgments Pages: 299 - 300

4. Cyanospira rippkae and Cyanospira capsulata (gen. nov. and spp. nov.): new filamentous heterocystous cyanobacteria from Magadi lake (Kenya)

   • G. Florenzano
   • C. Sili
   • M. Vincenzini

   Original Papers Pages: 301 - 306

5. Quantitative estimation of the surface carbohydrates on the infection structures of rust fungi with enzymes and lectins

   • Kurt Mendgen
   • Martina Lange
   • Karin Bretschneider

   Original Papers Pages: 307 - 311

6. Influence of ethanol on the hopanoid content and the fatty acid pattern in batch and continuous cultures of Zymomonas mobilis

   • Stephanie Bringer
   • Thomas Härtner
   • Hermann Sahm

   Original Papers Pages: 312 - 316

7. Repression and inhibition of cephalosporin synthetases in Streptomyces clavuligerus by inorganic phosphate

   • Claus Lübbe
   • Saul Wolfe
   • Arnold L. Demain

   Original Papers Pages: 317 - 320

8. Isolation of thermophilic obligately autotrophic hydrogen-oxidizing bacteria, similar to Hydrogenobacter thermophilus, from Icelandic hot springs

   • Jakob K. Kristjansson
   • Arni Ingason
   • Gudni A. Alfredsson

   Original Papers Pages: 321 - 325

9. Degradation of lignin and lignin related compounds by protoplasts isolated from Fomes annosus

   • Jerzy Trojanowski
   • Aloys Hüttermann
   • Joseph G. H. Wessels

   Original Papers Pages: 326 - 330

10. Utilization of aromatic amino acids as nitrogen sources in Brevibacterium linens: an inducible aromatic amino acid aminotransferase

    • Chang-Won Lee
    • Michel J. Desmazeaud

    Original Papers Pages: 331 - 337

11. Endospores of Sporosarcina halophila: characteristics and ultrastructure

    • Fatma Fahmy
    • F. Mayer
    • D. Claus

    Original Papers Pages: 338 - 342

12. Functional domains of colicin M

    • Ralf Dreher
    • Volkmar Braun
    • Brigitte Wittmann-Liebold

    Original Papers Pages: 343 - 346

13. Relationships between rhizoplane and rhizosphere bacteria and verticillium wilt resistance in potato

    • H. R. Azad
    • J. R. Davis
    • C. I. Kado

    Original Papers Pages: 347 - 351

14. Derivatives of Rhizobium meliloti strains carrying a plasmid of Rhizobium leguminosarum specifying hydrogen uptake and pea-specific symbiotic functions

    • R. M. Behki
    • G. Selvaraj
    • V. N. Iyer

    Original Papers Pages: 352 - 357

15. Proton translocation during denitrification in Rhodopseudomonas sphaeroides f. denitrificans

    • Balaram Kundu
    • D. J. D. Nicholas

    Original Papers Pages: 358 - 364

16. Temperature dependency of the Mg-ATPase and photophosphorylation activities in Rhodospirillum rubrum chromatophores

    • Javier G. Fernández Velasco
    • Norma L. Pucheu
    • Augusfo F. García

    Original Papers Pages: 365 - 368

17. Purification and regulation of glutamine synthetase in a collagenolytic Vibrio alginolyticus strain

    • Sandhya J. Bodasing
    • Paul W. Brandt
    • David R. Woods

    Original Papers Pages: 369 - 374

18. Regulation of the β-ketoadipate pathway in Rhizobium japonicum and bacteroids by succinate

    • Mechthild Röhm
    • Dietrich Werner

    Original Papers Pages: 375 - 379

19. The membraneous nitrite reductase involved in the electron transport of Wolinella succinogenes

    • Imke Schröder
    • Anthony M. Roberton
    • Achim Kröger

    Original Papers Pages: 380 - 386

20. Anaerobic oxidation of fatty acids by Clostridium bryantii sp. nov., a sporeforming, obligately syntrophic bacterium

    • Marion Stieb
    • Bernhard Schink

    Original Papers Pages: 387 - 390