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Extracellular proteins limit the dispersal of biogenic nanoparticles

January 1, 2007

High-spatial-resolution secondary ion microprobe spectrometry, synchrotron radiation-based Fourier-transform infrared spectroscopy, and polyacrylamide gel analysis demonstrated the intimate association of proteins with spheroidal aggregates of biogenic zinc sulfide nanocrystals, an example of extracellular biomineralization. Experiments involving synthetic zinc sulfide nanoparticles and representative amino acids indicated a driving role for cysteine in rapid nanoparticle aggregation. These findings suggest that microbially derived extracellular proteins can limit the dispersal of nanoparticulate metal-bearing phases, such as the mineral products of bioremediation, that may otherwise be transported away from their source by subsurface fluid flow.

Publication Year 2007
Title Extracellular proteins limit the dispersal of biogenic nanoparticles
DOI 10.1126/science.1141064
Authors J.W. Moreau, P.K. Weber, M.C. Martin, B. Gilbert, I.D. Hutcheon, J.F. Banfield
Publication Type Article
Publication Subtype Journal Article
Series Title Science
Index ID 70029811
Record Source USGS Publications Warehouse