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Microbial metal respiration : from geochemistry to potential applications

Author: Johannes Gescher; Andreas Kappler
Publisher: Heidelberg : Springer, [2013] ©2013
Edition/Format:   eBook : Document : EnglishView all editions and formats
Database:WorldCat
Summary:
Microbes can respire on metals. This seemingly simple finding is one of the major discoveries that were made in the field of microbiology in the last few decades. The importance of this observation is evident. Metals are highly abundant on our planet. Iron is even the most abundant element on Earth and the forth most abundant element in the Earths crust. Hence, in some environments iron, but also other metals or  Read more...
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Genre/Form: Electronic books
Additional Physical Format: Print version:
Microbial metal respiration
(DLC) 2012949711
(OCoLC)835887411
Material Type: Document, Internet resource
Document Type: Internet Resource, Computer File
All Authors / Contributors: Johannes Gescher; Andreas Kappler
ISBN: 9783642328671 3642328679
OCLC Number: 871537648
Description: 1 online resource (viii, 233 pages) : illustrations.
Contents: Minerals and Aqueous Species of Iron and Manganese as Reactants and Products of Microbial Metal Respiration --
Energetic and Molecular Constraints on the Mechanism of Environmental Fe(III) Reduction by Geobacter --
Biochemistry of Extracellular Respiration in Shewanella oneidensis --
On the Role of Endogenous Electron Shuttles in Extracellular Electron Transfer --
Humic Substances and Extracellular Electron Transfer --
Metal Reducers und Reduction Targets. A Short Survey about the Distribution of Dissimilatory Metal Reducers and the Multitude of Terminal Electron Acceptors --
Metal Reduction as a Tool in Bioremediation Processes --
Dissimilatory Metal Reducers Producing Electricity --
Microbial Fuel Cells.
Responsibility: Johannes Gescher, Andreas Kappler, editors.

Abstract:

Microbes can respire on metals. This seemingly simple finding is one of the major discoveries that were made in the field of microbiology in the last few decades. The importance of this observation is evident. Metals are highly abundant on our planet. Iron is even the most abundant element on Earth and the forth most abundant element in the Earths crust. Hence, in some environments iron, but also other metals or metalloids, are the dominant respiratory electron acceptors. Their reduction massively drives the carbon cycle in these environments and establishes redox cycles of the metallic electron acceptors themselves. These redox cycles are not only a driving force for other biotic reactions but are furthermore necessary for initiating a number of geochemically relevant abiotic redox conversions. Although widespread and ecologically influential, electron transfer onto metals like ferric iron or manganese is biochemically challenging. The challenge is to transfer respiratory electrons onto metals that occur in nature at neutral pH in the form of metal oxides or oxihydroxides that are effectively insoluble. Obviously, it is necessary that the microbes specially adapt in order to catalyze the electron transfer onto insoluble electron acceptors. The elucidation of these adaptations is an exciting ongoing process. To sum it up, dissimilatory metal reduction has wide-spread implications in the field of microbiology, biochemistry and geochemistry and its discovery was one of the major reasons to establish a novel scientific field called geomicrobiology. Recently, the discovery of potential applications of dissimilatory metal reducers in bioremediation or current production in a microbial fuel cell further increased the interest in studying microbial metal reduction.

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