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Proc Natl Acad Sci U S A

Title:		Temperature-driven decoupling of key phases of organic matter degradation in marine sediments
Author(s):		Weston NB; Joye SB;
Address:		"Department of Marine Sciences, University of Georgia, Athens, GA 30602, USA"
Journal Title:		Proc Natl Acad Sci U S A
Year:		2005
Volume:		20051114
Issue:		47
Page Number:		17036 - 17040
DOI:		10.1073/pnas.0508798102
ISSN/ISBN:		0027-8424 (Print) 1091-6490 (Electronic) 0027-8424 (Linking)
Abstract:		"The long-term burial of organic carbon in sediments results in the net accumulation of oxygen in the atmosphere, thereby mediating the redox state of the Earth's biosphere and atmosphere. Sediment microbial activity plays a major role in determining whether particulate organic carbon is recycled or buried. A diverse consortium of microorganisms that hydrolyze, ferment, and terminally oxidize organic compounds mediates anaerobic organic matter mineralization in anoxic sediments. Variable temperature regulation of the sequential processes, leading from the breakdown of complex particulate organic carbon to the production and subsequent consumption of labile, low-molecular weight, dissolved intermediates, could play a key role in controlling rates of overall organic carbon mineralization. We examined sediment organic carbon cycling in a sediment slurry and in flow through bioreactor experiments. The data show a variable temperature response of the microbial functional groups mediating organic matter mineralization in anoxic marine sediments, resulting in the temperature-driven decoupling of the production and consumption of organic intermediates. This temperature-driven decoupling leads to the accumulation of labile, low-molecular weight, dissolved organic carbon at low temperatures and low-molecular weight dissolved organic carbon limitation of terminal metabolism at higher temperatures"
Keywords:		"*Bacterial Physiological Phenomena Biodegradation, Environmental Fatty Acids, Volatile/biosynthesis Fermentation/*physiology Geologic Sediments/*microbiology Hydrolysis Oceans and Seas Oxidation-Reduction Phospholipids/biosynthesis Sulfates/*metabolism *T;"
Notes:		"MedlineWeston, Nathaniel B Joye, Samantha B eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2005/11/16 Proc Natl Acad Sci U S A. 2005 Nov 22; 102(47):17036-40. doi: 10.1073/pnas.0508798102. Epub 2005 Nov 14"