HR: 17:00h
AN: B44A-05 INVITED [Abstracts]
TI: Isolation and Characterization of Metal-Reducing Shewanella Species from Tidal Flat Sediments of
Southwest Coast, Korea
AU: * Roh, Y
EM: rohy@chonnam.ac.kr
AF: Chonnam National University, 300 Yongbong-Dong, Buk-Gu, Gwangju, 500-757
Korea, Republic of
AU: Lee, J
EM: jhlee2@gist.ac.kr
AF: Gwangju Institute of Science and Technology, 1 Oryong-Dong, Buk-Gu, Gwangju, 500-712
Korea, Republic of
AU: Lee, S
EM: slee@catholic.ac.kr
AF: The Catholic University of Korea, San 43-1, Yokkok-2Dong, Wonmi-Gu, Gyonggi-Do, 400-743
Korea, Republic of
AU: Hur, H
EM: hghur@gist.ac.kr
AF: The Catholic University of Korea, San 43-1, Yokkok-2Dong, Wonmi-Gu, Gyonggi-Do, 400-743
Korea, Republic of
AB:
Although microbe-metal interactions play important roles in the metal geochemistry and organic matter mineralization in tidal
flat sediments, study of microbial metal reduction by bacteria isolated from tidal flat sediments is beginning to be studied
in Korea. The objective of this study was to explore Fe(III) and metal reduction by metal-reducing bacteria isolated from
Tidal Flat Sediments of Southwest Coast, Korea. 10 bacteria strains were isolated from tidal flat sediments of Southwest
Coast, Korea. The taxonomic characterization of these strains indicated that they belong to the genus Shewanella. These
strains were able to reduce ferric iron of several ferric compounds [FeCl3, Fe-citrate, FeOOH] and metals such as As(V)
and Se(VI) using short chain fatty acids as the electron donors. These bacteria exhibited diverse mineral formation
capabilities including the formation of magnetite (Fe3O4), siderite (FeCO3), vivianite
[Fe3(PO4)28H2O], AsS, and Se(0). One (HN-41) of the isolates reduced akaganeite (FeOOH) and formed
mono-dispersed (~ 30 nm) magnetite (Fe3O4) nanoparticles . These results indicate that microbial Fe(III) reduction
may not only play important roles in iron and carbon biogeochemistry as well as immobilization of metal contaminants in
tidal flat sediment.
DE: 0418 Bioremediation
DE: 0419 Biomineralization
DE: 0428 Carbon cycling (4806)
DE: 0448 Geomicrobiology
DE: 0463 Microbe/mineral interactions
SC: Biogeosciences [B]
MN: Fall Meeting 2005