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PHYSIOLOGY AND BIOTECHNOLOGY

Product Inhibition of Butyrate Metabolism by Acetate and Hydrogen in a Thermophilic Coculture

Birgitte K. Ahring, Peter Westermann
Birgitte K. Ahring
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Peter Westermann
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ABSTRACT

Studies on product inhibition of a thermophilic butyrate-degrading bacterium in syntrophic association with Methanobacterium thermoautotrophicum showed that a gas phase containing more than 2 × 10−2 atm (2.03 kPa) of hydrogen prevented growth and butyrate consumption, while a lower hydrogen partial pressure of 1 × 10−3 to 2 × 10−2 atm (0.1 to 2.03 kPa) gradually inhibited the butyrate consumption of the coculture. No inhibition of butyrate consumption was found on the addition of 0.75 × 10−3 atm (76 Pa) of hydrogen to the gas phase. A slight inhibition of butyrate consumption by the coculture occurred at an acetate concentration of 16.4 mM. Inhibition gradually increased with increasing acetate concentration up to 81.4 mM, when complete inhibition of butyrate consumption occurred. When the culture contained an acetate-utilizing methanogen in addition to M. thermoautotrophicum, the inhibition of the triculture by acetate was gradually reversed as the acetate concentration was lowered by the aceticlastic methanogen. The results show that optimal growth conditions for the thermophilic butyrate-degrading bacterium depend on both hydrogen and acetate removal.

FOOTNOTES

  • ↵* Corresponding author.

  • Copyright © 1988, American Society for Microbiology
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Product Inhibition of Butyrate Metabolism by Acetate and Hydrogen in a Thermophilic Coculture
Birgitte K. Ahring, Peter Westermann
Applied and Environmental Microbiology Oct 1988, 54 (10) 2393-2397; DOI:

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Product Inhibition of Butyrate Metabolism by Acetate and Hydrogen in a Thermophilic Coculture
Birgitte K. Ahring, Peter Westermann
Applied and Environmental Microbiology Oct 1988, 54 (10) 2393-2397; DOI:
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