1. Evaluation of strain competitiveness in Rhizobium leguminosarum bv phaseoli using a nod ⁺ fix⁻ natural mutant

   • Luiz A. de Oliveira
   • Peter H. Graham

   Original Papers Pages: 305 - 310

2. Speed of nodulation and competitive ability among strains of Rhizobium leguminosarum bv phaseoli

   • L. A. de Oliveira
   • P. H. Graham

   Original Papers Pages: 311 - 315

3. A quantitative ultrastructural study of Chromatium minus in the bacterial layer of Lake Cisó (Spain)

   • Isabel Esteve
   • Emili Montesinos
   • Ricardo Guerrero

   Original Papers Pages: 316 - 323

4. Degradation of dibenzothiophene by Brevibacterium sp.DO

   • Manfred van Afferden
   • Sigrid Schacht
   • Hans G. Trüper

   Original Papers Pages: 324 - 328

5. Soluble and membrane-bound ferrisiderophore reductases of Escherichia coli K-12

   • Eckhard Fischer
   • Birgit Strehlow
   • Volkmar Braun

   Original Papers Pages: 329 - 336

6. Regulation of methanol metabolism in the facultative methylotroph Nocardia sp. 239 during growth on mixed substrates in batch- and continuous cultures

   • L. de Boer
   • G. J. Euverink
   • L. Dijkhuizen

   Original Papers Pages: 337 - 343

7. Comparative anoxygenic photosynthetic capacity in 7 strains of a thermophilic cyanobacterium

   • Ferran Garcia-Pichel
   • Richard W. Castenholz

   Original Papers Pages: 344 - 351

8. Degradation of ¹⁴C-labelled lignin and dehydropolymer of coniferyl alcohol by ericoid and ectomycorrhizal fungi

   • Kurt Haselwandter
   • Ortwin Bobleter
   • David J. Read

   Original Papers Pages: 352 - 354

9. The Bacillus subtilis menCD promoter is responsive to extracellular pH

   • Kevin F. Hill
   • John P. Mueller
   • Harry W. Taber

   Original Papers Pages: 355 - 359

10. Characterization of Xanthobacter strains H4-14 and 25a and enzyme profiles after growth under autotrophic and heterotrophic conditions

    • W. G. Meijer
    • L. M. Croes
    • L. Dijkhuizen

    Original Papers Pages: 360 - 367

11. Chemotactic responses of Rhodobacter sphaeroides in the absence of apparent adaptation

    • Philip S. Poole
    • Rachel L. Williams
    • Judith P. Armitage

    Original Papers Pages: 368 - 372

12. Tn916-induced mutants of Clostridium acetobutylicum defective in regulation of solvent formation

    • Joachim Bertram
    • Anita Kuhn
    • Peter Dürre

    Original Papers Pages: 373 - 377

13. ATPase-dependent energy spilling by the ruminal bacterium, Streptococcus bovis

    • James B. Russell
    • Herbert J. Strobel

    Original Papers Pages: 378 - 383

14. Effects of ethanol on Saccharomyces cerevisiae as monitored by in vivo ³¹P and ¹³C nuclear magnetic resonance

    • Maria C. Loureiro-Dias
    • Helena Santos

    Original Papers Pages: 384 - 391

15. Heterotrophic growth of Thiobacillus acidophilus in batch and chemostat cultures

    • J. T. Pronk
    • P. J. W. Meesters
    • J. G. Kuenen

    Original Papers Pages: 392 - 398

16. Isolation and characterization of a thermophilic sulfate-reducing bacterium Desulfotomaculum thermoacetoxidans sp. nov.

    • Hang Min
    • S. H. Zinder

    Original Papers Pages: 399 - 404

17. Release of glucosylglycerol from the cyanobacterium Synechocystis spec. SAG 92.79 by hypoosmotic shock

    • S. Fulda
    • M. Hagemann
    • E. Libbert

    Original Papers Pages: 405 - 408

18. Sodium ions are necessary for growth and energy transduction in the marine cyanobacterium Oscillatoria brevis

    • Igor I. Brown
    • Sergey I. Fadeyev
    • Inna I. Severina

    Original Papers Pages: 409 - 411