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Promoting direct interspecies electron transfer with activated carbon
Liu, Fanghua ; Rotaru, Amelia-Elena ; Shrestha, Pravin M. ; Malvankar, Nikhil S. ; Nevin, Kelly P. ; Lovley, Derek R.
部门归属海岸带生物学与生物资源利用所重点实验室
通讯作者Liu, FH (reprint author), Univ Massachusetts, Dept Microbiol, Amherst, MA 01003 USA.,fanghua@microbio.umass.edu
学科主题Chemistry ; Multidisciplinary ; Chemical ; Energy & Fuels ; Environmental Sciences ; Engineering
关键词Waste-water Treatment Microbial Fuel-cells Geobacter-sulfurreducens Anaerobic Respiration Bacterial Communities Genetic System Fe(Iii) Oxide Double-layer Sp-nov Reduction
出处ENERGY & ENVIRONMENTAL SCIENCE
ISSN号1754-5692
2012
5期:10页:8982-8989
收录类别SCI
产权排序[Liu, Fanghua; Rotaru, Amelia-Elena; Shrestha, Pravin M.; Malvankar, Nikhil S.; Nevin, Kelly P.; Lovley, Derek R.] Univ Massachusetts, Dept Microbiol, Amherst, MA 01003 USA
资助信息Office of Science (BER), U. S. Department of Energy [DE-SC0004485]
英文摘要Granular activated carbon (GAC) is added to methanogenic digesters to enhance conversion of wastes to methane, but the mechanism(s) for GAC's stimulatory effect are poorly understood. GAC has high electrical conductivity and thus it was hypothesized that one mechanism for GAC stimulation of methanogenesis might be to facilitate direct interspecies electron transfer (DIET) between bacteria and methanogens. Metabolism was substantially accelerated when GAC was added to co-cultures of Geobacter metallireducens and Geobacter sulfurreducens grown under conditions previously shown to require DIET. Cells were attached to GAC, but did not aggregate as they do when making biological electrical connections between cells. Studies with a series of gene deletion mutants eliminated the possibility that GAC promoted electron exchange via interspecies hydrogen or formate transfer and demonstrated that DIET in the presence of GAC did not require the electrically conductive pili and associated c-type cytochrome involved in biological interspecies electrical connections. GAC also greatly stimulated ethanol metabolism and methane production in co-cultures of G. metallireducens and Methanosarcina barkeri. Cells were attached to GAC, but not closely aggregated, suggesting little opportunity for biological electrical contacts between the species. GAC also enhanced methane production in samples from a methanogenic digester in which Methanosaeta were the predominant methanogens. The results demonstrate that GAC can promote DIET and suggest that stimulation of metabolism in methanogenic digesters can be attributed, at least in part, to the high conductivity of GAC providing better interspecies electrical connections than those that can be forged biologically.
语种英语
文献类型共享期刊论文
条目标识符http://ir.yic.ac.cn/handle/133337/6313
专题科研共享资源
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GB/T 7714
Liu, Fanghua,Rotaru, Amelia-Elena,Shrestha, Pravin M.,et al. Promoting direct interspecies electron transfer with activated carbon. 2012.
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