Extracellular Proteins Limit the Dispersal of BiogenicNanoparticles
High spatial-resolution secondaryion microprobespectrometry, synchrotron radiation Fourier-transform infraredspectroscopy and polyacrylamide gel analysis demonstrate the intimateassociation of proteins with spheroidal aggregates of biogenic zincsulfide nanocrystals, an example of extracellular biomineralization.Experiments involving synthetic ZnS nanoparticles and representativeamino acids indicate a driving role for cysteine in rapid nanoparticleaggregation. These findings suggest that microbially-derivedextracellular proteins can limit dispersal of nanoparticulatemetal-bearing phases, such as the mineral products of bioremediation,that may otherwise be transported away from their source by subsurfacefluid flow.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Advanced Light Source(ALS)
- Sponsoring Organization:
- USDOE Director, Office of Science; National Aeronautics andSpace Administration
- DOE Contract Number:
- DE-AC02-05CH11231; NASA:NNA04CC02A
- OSTI ID:
- 926601
- Report Number(s):
- LBNL-62685; R&D Project: 458121; BnR: KC0204016
- Journal Information:
- Science, Vol. 316, Issue 5831; Related Information: Journal Publication Date: June 15,2007
- Country of Publication:
- United States
- Language:
- English
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