Interactions between respiration and denitrification during growth of Thiosphaera pantotropha in continuous culture

Jens Kirk Thomsen, J. J. Lansmann Iversen, Raymond P. Cox*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The effects of oxygen on the use of nitrate as an electron acceptor by the denitrifying bacterium Thiosphaera pantotropha were investigated during growth on acetate. In batch cultures under aerobic conditions nitrate was not utilised and the growth rate constant was 0.55 h-1. The corresponding value for growth on nitrate under anoxic conditions was 0.37 h-1. In acetate-limited continuous cultures with feedback control of the dissolved oxygen concentration, nitrate utilisation was totally inhibited by the lowest concentration of oxygen tested (22 μM). Carbon conversion efficiencies with acetate increased from 0.28 with nitrate to 0.44 with oxygen. The rates of nitrification calculated from nitrogen balance studies were not greater than 1.5% of the rate of anoxic denitrification.

Original languageEnglish
JournalFEMS Microbiology Letters
Volume110
Issue number3
Pages (from-to)319-323
ISSN0378-1097
DOIs
Publication statusPublished - 1. Jul 1993

Keywords

  • Growth rate
  • Growth yield
  • Nitrate
  • Nitrogen balance
  • Nutrification
  • Oxygen
  • Thiosphaera pantotropha

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