G eobacter sp. SD-1 with enhanced electrochemical activity in high-salt concentration solutions
KAUST Grant NumberKUS-I1-003-13
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Abstract© 2014 Society for Applied Microbiology and John Wiley & Sons Ltd. Summary: 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.sulfurreducensPCA and Geobacter metallireducensGS-15, and a mixed culture in microbial electrolysis cells. SD-1 produced a maximum current density of 290±29Am-3 in a high-concentration phosphate buffer solution (PBS-H, 200mM). This current density was significantly higher than that produced by the mixed culture (189±44Am-3) or the type strains (<70Am-3). In a highly saline water (SW; 50mM PBS and 650mM NaCl), current by SD-1 (158±4Am-3) was reduced by 28% compared with 50mM PBS (220±4Am-3), but it was still higher than that of the mixed culture (147±19Am-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.
CitationSun D, Call D, Wang A, Cheng S, Logan BE (2014) G eobacter sp. SD-1 with enhanced electrochemical activity in high-salt concentration solutions . Environmental Microbiology Reports 6: 723–729. Available: http://dx.doi.org/10.1111/1758-2229.12193.
SponsorsThis research was supported by Award KUS-I1-003-13 from the King Abdullah University of Science and Technology (KAUST), China Postdoctoral Science Foundation (Grant No. 2013 M541773), the National Science Foundation for Distinguished Young Scholars (Grant No. 51225802), the Science Fund for Creative Research Groups of the National Natural Science Foundation of China (Grant No. 51121062) and the National High-tech R&D Program of China (863 Program, Grant No. 2011AA060904).