title: Silver-based crystalline nanoparticles, microbially fabricated.
abstract: One mechanism of silver resistance in microorganisms is accumulation of the metal ions in the cell. Here, we report on the phenomenon of biosynthesis of silver-based single crystals with well-defined compositions and shapes, such as equilateral triangles and hexagons, in Pseudomonas stutzeri AG259. The crystals were up to 200 nm in size and were often located at the cell poles. Transmission electron microscopy, quantitative energy-dispersive x-ray analysis, and electron diffraction established that the crystals comprise at least three different types, found both in whole cells and thin sections. These Ag-containing crystals are embedded in the organic matrix of the bacteria. Their possible potential as organic-metal composites in thin film and surface coating technology is discussed.
authors.affiliation: Department of Materials Science, The Angström Laboratory, Uppsala University, SE-751 21 Uppsala, Sweden. Tanja.Klaus@angstrom.uu.se
authors.forename: T
authors.initials: T
authors.lastname: Klaus
authors.forename: R
authors.initials: R
authors.lastname: Joerger
authors.forename: E
authors.initials: E
authors.lastname: Olsson
authors.forename: C G
authors.initials: CG
authors.lastname: Granqvist
mesh_terms: D003460:Crystallization; D003470:Culture Media; D011549:Pseudomonas / Q000254:growth & development / Q000378:metabolism* / Q000648:ultrastructure; D012834:Silver / Q000378:metabolism*; D018030:Silver Compounds / Q000378:metabolism; D012835:Silver Nitrate / Q000378:metabolism
chemical_list: D003470:Culture Media; D018030:Silver Compounds; D012834:Silver; D012835:Silver Nitrate; C013251:silver sulfide