1. Methanobacterium formicicum, an endosymbiont of the anaerobic ciliateMetopus striatus McMurrich

   • Johan J. A. van Bruggen
   • Kor B. Zwart
   • Godfried G. Vogels

   Original Papers Pages: 1 - 7

2. Autotrophic synthesis of activated acetic acid from two CO₂ inMethanobacterium thermoautotrophicum

   • Erhard Stupperich
   • Georg Fuchs

   Original Papers Pages: 8 - 13

3. Autotrophic synthesis of activated acetic acid from two CO₂ inMethanobacterium thermoautotrophicum

   • Erhard Stupperich
   • Georg Fuchs

   Original Papers Pages: 14 - 20

4. Light-induced chemotactic responses of the colorless flagellate,Polytomella magna, in the presence of photodynamic dyes

   • Wilhelm Nultsch
   • Maria Häder

   Original Papers Pages: 21 - 27

5. Regulation of phosphate uptake kinetics inOscillatoria agardhii

   • Roel Riegman
   • Luuc R. Mur

   Original Papers Pages: 28 - 32

6. Composition of the cell wall of the phage resistant mutantRhodopseudomonas capsulata St. Louis RC1^-

   • H. T. Flammann
   • J. Weckesser

   Original Papers Pages: 33 - 37

7. The capsule and slime polysaccharides of the wild type and a phage resistant mutant ofRhodopseudomonas capsulata St. Louis

   • H. T. Flammann
   • J. R. Golecki
   • J. Weckesser

   Original Papers Pages: 38 - 43

8. Co-induction of sucrose transport and invertase activities in a thermophilic fungus,Thermomyces lanuginosus

   • P. Palanivelu
   • P. V. Balasubramanyam
   • Ramesh Maheshwari

   Original Papers Pages: 44 - 47

9. Induction of xylulose-5-phosphate phosphoketolase in a variety of yeasts grown ond-xylose: the key to efficient xylose metabolism

   • Christopher Thomas Evans
   • Colin Ratledge

   Original Papers Pages: 48 - 52

10. Hydrogen oxidation and efficiency of nitrogen fixation in succinate-limited chemostat cultures ofRhizobium ORS 571

    • Hein Stam
    • Henk W. van Verseveld
    • Adriaan H. Stouthamer

    Original Papers Pages: 53 - 60

11. Kinetics of sulfate uptake by freshwater and marine species ofDesulfovibrio

    • Kjeld Ingvorsen
    • Bo B. Jørgensen

    Original Papers Pages: 61 - 66

12. Effects of methylammonium and ofL-methionine-DL-sulfoximine on the growth and nitrogen metabolism ofPhaeodactylum tricornutum

    • R. C. Cresswell
    • P. J. Syrett

    Original Papers Pages: 67 - 71

13. Isolation and characterization of microcin E 492 fromKlebsiella pneumoniae

    • Víctor de Lorenzo

    Original Papers Pages: 72 - 75

14. The role ofc-type cytochromes in the terminal respiratory chain of the methylotrophic bacteriumMethylophilus methylotrophus

    • Mark A. Carver
    • Colin W. Jones

    Original Papers Pages: 76 - 82

15. Trends in the fertilization ofStreptomyces coelicolor A3(2)

    • Luisa Lanfaloni
    • Maria Rita Micheli
    • Giuseppe Sermonti

    Original Papers Pages: 83 - 86

16. Analogue-resistant and auxotrophic mutants ofMethanobacterium thermoautotrophicum

    • Andreas Kiener
    • Christof Holliger
    • Th. Leisinger

    Original Papers Pages: 87 - 90

17. Antigenic diversity of cytochromes c₃ from the anaerobic, sulfate-reducing bacteria,Desulfovibrio

    • Rivers Singleton Jr
    • Jean Denis
    • L. Leon Campbell

    Original Papers Pages: 91 - 94

18. Sexual agglutinin of mating-type minus gametes inChlamydomonas reinhardtii

    • Tatsuaki Saito
    • Yoshihiro Matsuda

    Original Papers Pages: 95 - 99

19. Convenient method to prepare neutral sulfide solution for cultivation of phototrophic sulfur bacteria

    • Eike Siefert
    • Norbert Pfennig

    Short Communications Pages: 100 - 101

20. Elemental analysis of particles in fungal zoospores

    • H. C. Aldrich
    • W. E. Barstow
    • W. L. Lingle

    Short Communications Pages: 102 - 104