Lanthier Martin, Gregory Kelvin B, Lovley Derek R
Eastern Cereal and Oilseed Research Center, Agriculture and Agri-Food Canada, Ottawa, ON, Canada.
FEMS Microbiol Lett. 2008 Jan;278(1):29-35. doi: 10.1111/j.1574-6968.2007.00964.x. Epub 2007 Nov 6.
Shewanella oneidensis MR-1 grew for over 50 days in microbial fuel cells, incompletely oxidizing lactate to acetate with high recovery of the electrons derived from this reaction as electricity. Electricity was produced with lactate or hydrogen and current was comparable to that of electricigens which completely oxidize organic substrates. However, unlike fuel cells with previously described electricigens, in which cells are primarily attached to the anode, at least as many of the S. oneidensis cells were planktonic as were attached to the anode. These results demonstrate that S. oneidensis may conserve energy for growth with an electrode serving as an electron acceptor and suggest that multiple strategies for electron transfer to fuel cell anodes exist.
奥奈达希瓦氏菌MR-1在微生物燃料电池中生长超过50天,将乳酸不完全氧化为乙酸,该反应产生的电子以电能形式得到了高回收率。用乳酸或氢气均可产生电流,其电流与完全氧化有机底物的产电菌相当。然而,与先前描述的产电菌的燃料电池不同,在先前的燃料电池中细胞主要附着在阳极上,而奥奈达希瓦氏菌浮游细胞的数量至少与附着在阳极上的细胞数量一样多。这些结果表明,奥奈达希瓦氏菌可以利用电极作为电子受体来保存生长所需的能量,并表明存在多种向燃料电池阳极进行电子转移的策略。