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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Arias, José M. Selenska-Pobell, Sonja Romero-González, María Nedelkova, Marta Reitz, Thomas Ojeda, Jesus J. Merroun, Mohamed L. Fernández, Margarita López |
| Description | Country affiliation: Germany Author Affiliation: Merroun ML ( Institute of Radiochemistry, Helmholtz Centre Dresden-Rossendorf, Dresden, Germany. merroun@ugr.es) |
| Abstract | This work describes the mechanisms of uranium biomineralization at acidic conditions by Bacillus sphaericus JG-7B and Sphingomonas sp. S15-S1 both recovered from extreme environments. The U-bacterial interaction experiments were performed at low pH values (2.0-4.5) where the uranium aqueous speciation is dominated by highly mobile uranyl ions. X-ray absorption spectroscopy (XAS) showed that the cells of the studied strains precipitated uranium at pH 3.0 and 4.5 as a uranium phosphate mineral phase belonging to the meta-autunite group. Transmission electron microscopic (TEM) analyses showed strain-specific localization of the uranium precipitates. In the case of B. sphaericus JG-7B, the U(VI) precipitate was bound to the cell wall. Whereas for Sphingomonas sp. S15-S1, the U(VI) precipitates were observed both on the cell surface and intracellularly. The observed U(VI) biomineralization was associated with the activity of indigenous acid phosphatase detected at these pH values in the absence of an organic phosphate substrate. The biomineralization of uranium was not observed at pH 2.0, and U(VI) formed complexes with organophosphate ligands from the cells. This study increases the number of bacterial strains that have been demonstrated to precipitate uranium phosphates at acidic conditions via the activity of acid phosphatase. |
| ISSN | 03043894 |
| Volume Number | 197 |
| e-ISSN | 18733336 |
| Journal | Journal of Hazardous Materials |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2011-12-15 |
| Publisher Place | Netherlands |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Bacillus Metabolism Microscopy, Electron, Transmission Methods Potentiometry Sphingomonas Uranium X-ray Absorption Spectroscopy Classification Biodegradation, Environmental Phylogeny Journal Article Research Support, Non-u.s. Gov't Discipline Environmental Science Discipline Environmental Chemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Environmental Chemistry Pollution Waste Management and Disposal Health, Toxicology and Mutagenesis Environmental Engineering |
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