1. Professor C. B. van Niel on his 70^th birthday

   Announcement Pages: 1 - 3

2. Citramalate lyase of Clostridium tetanomorphum

   • H. A. Barker

   OriginalPaper Pages: 4 - 12

3. The effect of sodium nitrite on the growth of Micrococcus denitrificans

   • Carlton Bovell

   OriginalPaper Pages: 13 - 19

4. Methanobacillus omelianskii, a symbiotic association of two species of bacteria

   • M. P. Bryant
   • E. A. Wolin
   • R. S. Wolfe

   OriginalPaper Pages: 20 - 31

5. Ferredoxin-dependent carbon assimilation in Rhodospirillum rubrum

   • Bob B. Buchanan
   • M. C. W. Evans
   • Daniel I. Arnon

   OriginalPaper Pages: 32 - 40

6. Isolation of free-living, anaerobic spirochetes

   • E. Canale-Parola
   • Stanley C. Holt
   • Zigrida Udris

   OriginalPaper Pages: 41 - 48

7. Some manifestations of energy storage in algae and chloroplasts

   • Roderick K. Clayton

   OriginalPaper Pages: 49 - 58

8. The “late-formers”—Changing concepts of the opsimorphs (Myxomycetes, Acrasieae, Myxobacteria)

   • Arthur L. Cohen

   OriginalPaper Pages: 59 - 71

9. The natural relationships of Aeromonas formicans

   • J. P. Crawford
   • S. Sikes
   • D. K. Melhorn

   OriginalPaper Pages: 72 - 81

10. A Thiococcus sp. nov. gen., its pigments and internal membrane system

    • K. E. Eimhjellen
    • Heidi Steensland
    • J. Traetteberg

    OriginalPaper Pages: 82 - 92

11. Changes with age in the absorption spectrum of chlorophyll α in a diatom

    • C. Stacy French

    OriginalPaper Pages: 93 - 103

12. Aerobic metabolism of Chromatium sp. strain D

    • Jane Gibson

    OriginalPaper Pages: 104 - 112

13. Enzyme induction and repression in anabolic and catabolic pathways

    • I. C. Gunsalus
    • A. U. Bertland II
    • L. A. Jacobson

    OriginalPaper Pages: 113 - 122

14. A continuous culture study of an obligately psychrophilic Pseudomonas species

    • W. Harder
    • H. Veldkamp

    OriginalPaper Pages: 123 - 130

15. Changes in pigment content of the diatom Navicula pelliculosa (Bréb.) Hilse in silicon-starvation synchrony

    • F. P. Healey
    • J. Coombs
    • B. E. Volcani

    OriginalPaper Pages: 131 - 142

16. The metabolism of p-hydroxybenzoate by Rhodopseudomonas palustris and its regulation

    • George D. Hegeman

    OriginalPaper Pages: 143 - 148

17. Purification and some properties of sulfite oxidase from Thiobacillus neapolitanus

    • Walter P. Hempfling
    • Philip A. Trudinger
    • Wolf Vishniac

    OriginalPaper Pages: 149 - 157

18. Hydrogen as an intermediate in the rumen fermentation

    • R. E. Hungate

    OriginalPaper Pages: 158 - 164

19. Enrichments of aquatic bacteria in continuous culture

    • Holger W. Jannasch

    OriginalPaper Pages: 165 - 173

20. Mutual host plant relationships in two groups of legume root nodule bacteria (Rhizobium spp.)

    • H. L. Jensen

    OriginalPaper Pages: 174 - 179

21. The origin of unconjugated pteridines in Crithidia fasciculata

    • G. W. Kidder
    • Virginia C. Dewey
    • H. Rembold

    OriginalPaper Pages: 180 - 184

22. Photoreduktion von Pyridinnucleotid durch Chromatophoren aus Rhodopseudomonas capsulata mit molekularem Wasserstoff

    • J. -H. Klemme
    • H. G. Schlegel

    OriginalPaper Pages: 185 - 196

23. On the gas vacuoles of the halobacteria

    • Helge Larsen
    • Sissel Omang
    • Heidi Steensland

    OriginalPaper Pages: 197 - 203

24. Some properties of mutant strains of Rhodopseudomonas spheroides which do not form bacteriochlorophyll

    • J. Lascelles
    • T. Altshuler

    OriginalPaper Pages: 204 - 210

25. On methylamine assimilation in a bacterium

    • E. R. Leadbetter
    • J. A. Gottlieb

    OriginalPaper Pages: 211 - 217

26. Thiobacillus perometabolis nov. sp., a non-autotrophic thiobacillus

    • Jack London
    • S. C. Rittenberg

    OriginalPaper Pages: 218 - 225

27. Some properties of the green bacterium Pelodictyon clathratiforme

    • Norbert Pfennig
    • Germaine Cohen-Bazire

    OriginalPaper Pages: 226 - 236

28. Intracellular development of a large DNA bacteriophage lytic for Caulobacter crescentus

    • J. S. Poindexter
    • P. R. Hornack
    • P. A. Armstrong

    OriginalPaper Pages: 237 - 246

29. Die Mixotrophie von Beggiatoa

    • Ernst G. Pringsheim

    OriginalPaper Pages: 247 - 254

30. The isolation and preliminary characterization of a halophilic photosynthetic bacterium

    • J. C. Raymond
    • W. R. Sistrom

    OriginalPaper Pages: 255 - 268

31. Kefiran, a novel polysaccharide produced in the kefir grain by Lactobacillus brevis

    • J. W. M. la Riviére
    • P. Kooiman
    • Karin Schmidt

    OriginalPaper Pages: 269 - 278

32. Purification of 2-keto-3-deoxy-6-phosphohexonate aldolases of Pseudomonas saccharophila

    • C. W. Shuster
    • M. Doudoroff

    OriginalPaper Pages: 279 - 286

33. The intracellular blue pigment of Pseudomonas lemonnieri

    • Mortimer P. Starr
    • Hans-Joachim Knackmuss
    • Gladys Cosens

    OriginalPaper Pages: 287 - 294

34. Stimulation of poly-β-hydroxybutyrate oxidation in Sphaerotilus discophorus by manganese and magnesium

    • J. L. Stokes
    • Margaret T. Powers

    OriginalPaper Pages: 295 - 301

35. The metabolism of aromatic acids by Pseudomonas testosteroni and P. acidovorans

    • M. L. Wheelis
    • N. J. Palleroni
    • R. Y. Stanier

    OriginalPaper Pages: 302 - 314

36. Induced synthesis of formyltetrahydrofolate synthetase in Micrococcus aerogenes

    • H. R. Whiteley

    OriginalPaper Pages: 315 - 323

37. Rhodopseudomonas palustris and Rh. viridis—Photosynthetic budding bacteria

    • R. Whittenbury
    • A. G. McLee

    OriginalPaper Pages: 324 - 334

38. On the evolution of differentiation

    • Barbara E. Wright

    OriginalPaper Pages: 335 - 344

39. Coryneform bacteria of the Arthrobacter type and their reserve material

    • E. G. Mulder
    • L. P. T. M. Zevenhuizen

    OriginalPaper Pages: 345 - 354