1. Involvement of ammonium metabolism in the nitrate inhibition of nitrogen fixation in Anabaena sp. strain ATCC 33047

   • Juan L. Ramos
   • Miguel G. Guerrero

   Original Papers Pages: 81 - 83

2. Some properties of glutamine synthetase from Rhizobium japonicum strains CC705 and CC723

   • Basant Bhandari
   • Franklin Vairinhos
   • D. J. D. Nicholas

   Original Papers Pages: 84 - 88

3. Symbiosis of methanogenic bacteria and sapropelic protozoa

   • Johan J. A. van Bruggen
   • Claudius K. Stumm
   • Godfried D. Vogels

   Original Papers Pages: 89 - 95

4. Sulfate assimilation in Rhodopseudomonas sulfidophila

   • J. F. Imhoff
   • M. Kramer
   • H. G. Trüper

   Original Papers Pages: 96 - 101

5. Legume-Rhizobium interactions: role of cowpea root exudate in polysaccharide synthesis and infectivity of Rhizobium species

   • Arvind A. Bhagwat
   • Joseph Thomas

   Original Papers Pages: 102 - 105

6. Propionate assimilation by methanogenic bacteria

   • B. Eikmanns
   • R. Jaenchen
   • Rudolf K. Thauer

   Original Papers Pages: 106 - 110

7. Unusual pathway of isoleucine biosynthesis in Methanobacterium thermoautotrophicum

   • B. Eikmanns
   • D. Linder
   • Rudolf K. Thauer

   Original Papers Pages: 111 - 113

8. Toxicity of 5-thioglucose towards a pathogenic yeast, Torulopsis glabrata

   • Wilfred N. Arnold

   Original Papers Pages: 114 - 116

9. Pseudomonas halodurans sp. nov., a halotolerant bacterium

   • Arthur Rosenberg

   Original Papers Pages: 117 - 123

10. Alkylsulfonic acids and some S-containing detergents as sulfur sources for growth of Chlorella fusca

    • Susanne Biedlingmaier
    • Ahlert Schmidt

    Original Papers Pages: 124 - 130

11. On the redox control of synthesis of anaerobically induced enzymes in enterobacteriaceae

    • A. Pecher
    • F. Zinoni
    • A. Böck

    Original Papers Pages: 131 - 136

12. The response of bacterial luminescence to an inhibitor of fatty acid biosynthesis

    • Dennis W. Grogan

    Original Papers Pages: 137 - 139

13. Occurrence of deletion plasmids at high rates after conjugative transfer of the plasmids RP4 and RK2 from Escherichia coli to Alcaligenes eutrophus H16

    • Helmut Schwab
    • Peter N. Saurugger
    • Robert M. Lafferty

    Original Papers Pages: 140 - 146

14. Ammonia assimilation pathways in Rhodopseudomonas capsulata E1F1

    • C. Moreno-Vivián
    • F. J. Cejudo
    • F. Castillo

    Original Papers Pages: 147 - 151

15. Electron transport and cytochromes in aerobically grown Proteus mirabilis

    • John E. van Wielink
    • Willem N. M. Reijnders
    • Adriaan H. Stouthamer

    Original Papers Pages: 152 - 157

16. Effect of polyamines on the intraperiplasmic growth of Bdellovibrio at low cell densities

    • Mazal Varon
    • Miriam Fine
    • Anat Stein

    Short Communications Pages: 158 - 159

17. Enzymes of gluconeogenesis in the autotroph Methanobacterium thermoautotrophicum

    • G. Fuchs
    • H. Winter
    • E. Stupperich

    Short Communications Pages: 160 - 162