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Title: Stability of U(VI)- and Tc(VII) reducing microbial communities to environmental perturbation: a thermodynamic network model and intermediate-scale experiments

The project is a collaborative task with a larger project headed by Jack Istok at Oregon State University, which is conducted under the same title. The project was conceptualized as follows. A ''geochemical'' model of microbial communities was hypothesized, in which microbes were characterized as mineral species according to the chemical transformations they used for metabolic function. The iron-reducing bacteria, for example, would be represented by the iron reducing chemical reaction, including a specific electron donor, the fraction of the consumed donor used for biomass maintenance or growth, and a free energy for the reaction. The pseudomineral species would then be included in a standard geochemical model, and community succession could be calculated according to the thermodynamically favored microbially mediated reactions under progressive consumption of electron donors and receptors, and evolving geochemical conditions. The project includes relatively minor participation by the University of Oklahoma and Pacific Northwest National Laboratory, with the major component at OSU. The PNNL project was funded to provide assistance to Dr. Istok in formulating the appropriate modeling approach and geochemical constraints on the modeling effort.
Authors:
; ; ;
Publication Date:
OSTI Identifier:
895882
Report Number(s):
ERSD-1024840-2006
R&D Project: ERSD 1024840; TRN: US200703%%205
Resource Type:
Technical Report
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA; Oregon State University, Corvallis, OR; University of Oklahoma, Norman, OK
Sponsoring Org:
USDOE - Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; 54 ENVIRONMENTAL SCIENCES; 59 BASIC BIOLOGICAL SCIENCES; BACTERIA; BINDING ENERGY; BIOMASS; CHEMICAL REACTIONS; COMMUNITIES; ELECTRONS; FREE ENERGY; IRON; MAINTENANCE; SIMULATION; STABILITY; THERMODYNAMICS; TRANSFORMATIONS; VALENCE