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 Previous Article

Appl. Environ. Microbiol., Dec 1996, 4678-4682, Vol 62, No. 12
Copyright © 1996, American Society for Microbiology

Morphological and metabolic responses to starvation by the dissimilatory metal-reducing bacterium Shewanella alga BrY

F Caccavo Jr, NB Ramsing and JW Costerton
Center for Biofilm Engineering, Montana State University, Bozeman 59717, USA. frank_c@erc.montana.edu

The response of the dissimilatory metal-reducing bacterium Shewanella alga BrY to carbon and nitrogen starvation was examined. Starvation resulted in a gradual decrease in the mean cell volume from 0.48 to 0.2 micron 3 and a dramatic decrease in Fe(III) reductase activity. Growth of starved cultures was initiated with O2, ferric oxyhydroxide, Co(III)- EDTA, or Fe(III)-bearing subsurface materials as the sole electron acceptor. Microbially reduced subsurface materials reduced CrO(4)2-. Starvation of dissimilatory metal-reducing bacteria may provide a means of delivering this metabolism to contaminated subsurface environments for in situ bioremediation.


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