期刊
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
卷 93, 期 2, 页码 871-880出版社
SPRINGER
DOI: 10.1007/s00253-011-3643-2
关键词
Microbial electrochemical system; Microbial fuel cell; Microbial electrolysis cell; Nanotechnology; Differential gene expression; DNA microarray
资金
- U.S. National Science Foundation [CBET 0828544]
- ONAMI/DOD (ARL-DOD) [W911NF-07-2-0083]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [0955124] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1057565] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1004737] Funding Source: National Science Foundation
Anode properties are critical for the performance of microbial electrolysis cells (MECs). In the present study, Fe nanoparticle-modified graphite disks were used as anodes to investigate the effects of nanoparticles on the performance of Shewanella oneidensis MR-1 in MECs. Results demonstrated that the average current densities produced with Fe nanoparticle-decorated anodes up to 5.89-fold higher than plain graphite anodes. Whole genome microarray analysis of the gene expression showed that genes encoding biofilm formation were significantly up-regulated as a response to nanoparticle-decorated anodes. Increased expression of genes related to nanowires, flavins, and c-type cytochromes indicates that enhanced mechanisms of electron transfer to the anode may also have contributed to the observed increases in current density. The majority of the remaining differentially expressed genes associated with electron transport and anaerobic metabolism demonstrate a systemic response to increased power loads.
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