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Title: Metal Cycling by Bacteria: Moving Electrons Around

About 20 years ago, Shewanella oneidensis MR-1 was isolated from a manganese-rich lack in upstate New York, and subsequently shown to utilize solid forms of oxidized manganese or iron as an electron amore »cceptor. Recent studies of metal-reducing bacterial have unveiled a number of unexpected properties of microbes that have enlarged our view of microbes and their role(s) in natural ecosystems. For example, the processes of metal reduction themselves are fundamental to the carbon cycle in many lakes and sediments, where iron and manganese account for the major portion of organic carbon oxidation in many sediments. On more modest spatial scales, iron and manganese reduction can be linked to the oxidation of a wide variety of carbon compounds, many of them recalcitrant and/or toxic. One remarkable property of metal reducers is their ability to reduce solid, often highly crystalline substrates such as iron and manganese oxides and oxyhydroxides. It is now clear that this is done via the utilization of enzymes located on the outer wall of the bacteria - enzymes that apparently interact directly with these solid substrates. Molecular and genomic studies combined have revealed the genes and protoeins responsible for these activities, and many facets of the regulation. This talk focuses on the general features and properties of these remarkable organisms that seem to communicate via electron transfer across a wide variety of soluable, insoluable, and even "inert" substrates, and the way that these processes may be mechanistically linked.« less
Title: Metal Cycling by Bacteria: Moving Electrons Around
Publication Date: 2009-07-06
OSTI Identifier: 987291
DOE Contract Number: ACO2-06CH11357
Other Number(s): Other: 70605
Resource Type: Multimedia
Specific Type: Multimedia Presentation
Resource Relation: Conference: APS Colloquium Series, Advanced Photon Source (APS) at Argonne National Laboratory, Argonne, Illinois (United States), presented on July 06, 2005
Research Org: ANL-APS (Argonne National Laboratory-Advanced Photon Source (United States))
Sponsoring Org: USDOE Office of Science (SC)
Publisher: Advanced Photon Source (APS) Colloquium Series Video Collection
Country of Publication: United States
Language: English
Run Time: 0:52:39
System Entry Date: 2016-01-27