Archives of Microbiology

, Volume 141, Issue 3, pp 181–186

A new extremely thermophilic, sulfur-reducing heterotrophic, marine bacterium

  • Shimshon Belkin
  • Holger W. Jannasch
Original Papers

DOI: 10.1007/BF00408055

Cite this article as:
Belkin, S. & Jannasch, H.W. Arch. Microbiol. (1985) 141: 181. doi:10.1007/BF00408055


An extremely thermophilic (optimum growth at 88° C), anaerobic bacterium was isolated from a shallow submarine thermal spring. It appears to be an obligate heterotroph, capable of reducing sulfur to H2S. Oxygen sensitivity is apparent only at and above those temperatures where growth occurs, while the cultures retain their viability for long periods under air at 4° C. Insensitivity to chloramphenicol, vancomycin and streptomycin, and lack of muramic acid in its cell wall, indicate a possible affilitation of the new isolate to the thermoacidophilic archaebacteria. However, its neutrophilic and hetertrophic nature, as well as its DNA base composition (39.1 mol % guanine plus cytosine) set it apart from the known genera of this group.

Key words

ArchaebacteriaExtreme thermophilySulfur reduction



Artifical sea water medium

Bis-tris propane



2(N-morpholino)ethanesulfonic acid


Piperazine-N,N′-bis(2-ethanesulfonic acid)

Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • Shimshon Belkin
    • 1
  • Holger W. Jannasch
    • 1
  1. 1.Department of BiologyWoods Hole Oceanographic InstitutionWoods HoleUSA
  2. 2.Membrane Bioenergetics GroupUniversity of CaliforniaBerkeleyUSA