A unified model describing the role of hydrogen in the growth of Desulfovibrio vulgaris under different environmental conditions

Daniel R. Noguera, Gregory A. Brusseau, Bruce E. Rittmann, David A. Stahl

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

A unified model for the growth of Desulfovibrio vulgaris under different environmental conditions is presented. The model assumes the existence of two electron transport mechanisms functioning simultaneously. One mechanism results in the evolution and consumption of hydrogen, as in the hydrogen- cycling model. The second mechanism assumes a direct transport of electrons from the donor to the acceptor, without the participation of H2. A combination of kinetic and thermodynamic conditions control the flow of electrons through each pathway. The model was calibrated using batch experiments with D. vulgaris grown on lactate, in the presence and absence of sulfate, and was verified using additional batch experiments under different conditions. The model captured the general trends of consumption of substrates and accumulation of products, including the transient accumulation and consumption of H2. Furthermore, the model estimated that 48% of the electrons transported from lactate to sulfate involved H2 production, indicating that hydrogen cycling is a fundamental process in D. vulgaris. The presence of simultaneous electron transport mechanisms might provide D. vulgaris with important ecological advantages, because it facilitates a rapid response to changes in environmental conditions. This model increases our ability to study the microbial ecology of anaerobic environments and the role of Desulfovibrio species in a variety of environments.

Original languageEnglish (US)
Pages (from-to)732-746
Number of pages15
JournalBiotechnology and bioengineering
Volume59
Issue number6
DOIs
StatePublished - Sep 20 1998
Externally publishedYes

Keywords

  • Anaerobic
  • Desulfovibrio vulgaris
  • Hydrogen cycling
  • Kinetics
  • Modeling
  • Thermodynamics

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Applied Microbiology and Biotechnology

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