Surface structure effects on direct reduction of iron oxides by Shewanella oneidensis.
EMSL Project ID
3274
Abstract
This collaboration aims to determine how the atomic and electronic structure of mineral surfaces affects the dissimilatory bacterial reduction of iron and manganese minerals. We hypothesize that surface structure effects must be accounted for in future studies of cell-mineral interactions. Cell accumulation will be used as a proxy for cell activity at three iron oxide single crystal faces; hematite (001), magnetite (111) and magnetite (100). Modeling of the electron transfer process to the different mineral surfaces from a decaheme cytochrome found in the outer membrane of S. oneidensis will be accomplished by employing both Marcus and ab initio density functional theories. The results of the modeling will be compared with the empirical observations to evaluate whether or not mineral surface structure should influence mineral surface-associated cell activity.
Project Details
Project type
Exploratory Research
Start Date
2003-05-06
End Date
2006-05-07
Status
Closed
Released Data Link
Team
Principal Investigator
Related Publications
Neal AL, KM Rosso, G Geesey, YA Gorby, and B Little. 2003. "Surface Structure Effects on Direct Reduction of Iron Oxides by Shewanella Oneidensis." Geochimica et Cosmochimica Acta 67(23):4489-4503.