title: Geobacter sp. SD-1 with enhanced electrochemical activity in high-salt concentration solutions.
abstract: An isolate, designated strain SD-1, was obtained from a biofilm dominated by Geobacter sulfurreducens in a microbial fuel cell. The electrochemical activity of strain SD-1 was compared with type strains, G. sulfurreducens PCA and Geobacter metallireducens GS-15, and a mixed culture in microbial electrolysis cells. SD-1 produced a maximum current density of 290 ± 29 A m−3 in a high-concentration phosphate buffer solution (PBS-H, 200 mM). This current density was significantly higher than that produced by the mixed culture (189 ± 44 A m−3) or the type strains (< 70 A m−3). In a highly saline water (SW; 50 mM PBS and 650 mM NaCl), current by SD-1 (158 ± 4 A m−3) was reduced by 28% compared with 50 mM PBS (220 ± 4 A m−3), but it was still higher than that of the mixed culture (147 ± 19 A m−3), and strains PCA and GS-15 did not produce any current. Electrochemical tests showed that the improved performance of SD-1 was due to its lower charge transfer resistance and more negative potentials produced at higher current densities. These results show that the electrochemical activity of SD-1 was significantly different than other Geobacter strains and mixed cultures in terms of its salt tolerance.
authors.forename: Dan
authors.initials: D
authors.lastname: Sun
authors.forename: Douglas
authors.initials: D
authors.lastname: Call
authors.forename: Aijie
authors.initials: A
authors.lastname: Wang
authors.forename: Shaoan
authors.initials: S
authors.lastname: Cheng
authors.forename: Bruce E
authors.initials: BE
authors.lastname: Logan
mesh_terms: D001674:Bioelectric Energy Sources / Q000382:microbiology; D045302:Geobacter / Q000737:chemistry* / Q000378:metabolism*; D012965:Sodium Chloride / Q000378:metabolism*
chemical_list: D012965:Sodium Chloride