期刊
FEMS MICROBIOLOGY ECOLOGY
卷 86, 期 3, 页码 590-597出版社
OXFORD UNIV PRESS
DOI: 10.1111/1574-6941.12185
关键词
synthesis gas; syngas; carbon monoxide; anaerobic degradation; microbial diversity; microbial physiology
类别
资金
- FEDER funds through the Operational Competitiveness Programme (COMPETE)
- national funds through the Portuguese Foundation for Science and Technology (FCT) [FCOMP-01-0124-FEDER-027894]
- FCT
- European Social Fund (POPH-QREN) through the PhD grant [SFRH/BD/48965/2008]
- Netherlands Science Foundation (NWO) [CW-TOP 700.55.343, ALW 819.02.014]
- Consolider-CSD [2007-00055]
- ERC [323009]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/48965/2008] Funding Source: FCT
Thermophilic (55 degrees C) anaerobic microbial communities were enriched with a synthetic syngas mixture (composed of CO, H-2, and CO2) or with CO alone. Cultures T-Syn and T-CO were incubated and successively transferred with syngas (16 transfers) or CO (9 transfers), respectively, with increasing CO partial pressures from 0.09 to 0.88bar. Culture T-Syn, after 4 successive transfers with syngas, was also incubated with CO and subsequently transferred (9 transfers) with solely this substrate - cultures T-Syn-CO. Incubation with syngas and CO caused a rapid decrease in the microbial diversity of the anaerobic consortium. T-Syn and T-Syn-CO showed identical microbial composition and were dominated by Desulfotomaculum and Caloribacterium species. Incubation initiated with CO resulted in the enrichment of bacteria from the genera Thermincola and Thermoanaerobacter. Methane was detected in the first two to three transfers of T-Syn, but production ceased afterward. Acetate was the main product formed by T-Syn and T-Syn-CO. Enriched T-CO cultures showed a two-phase conversion, in which H-2 was formed first and then converted to acetate. This research provides insight into how thermophilic anaerobic communities develop using syngas/CO as sole energy and carbon source can be steered for specific end products and subsequent microbial synthesis of chemicals.
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