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Crystal lattice defects in nanocrystalline metacinnabar in contaminated streambank soils suggest a role for biogenic sulfides in the formation of mercury sulfide phases.
Environ Sci Process Impacts
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Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
At mercury (Hg)-contaminated sites, streambank erosion can act as a main mobilizer of Hg into nearby waterbodies. Once deposited into the waters, mercury from these soils can be transformed to MeHg by microorganisms. It is therefore important to understand the solid-phase speciation of Hg in streambanks as differences in Hg speciation will have implications for Hg transport and bioavailability.
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Olana Technologies Inc.,5424 Arlington Avenue, H51, Bronx, NY 10471, USA.
We have used a computer simulation system to examine formation of the chick primitive streak and to test the proposal (Wei and Mikawa Development 127 (2000) 87) that oriented cell division could account for primitive streak elongation. We find that this proposal is inadequate to explain elongation of the streak. In contrast, a correctly patterned model streak can be generated if two putative mechanisms are operative.
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LPS, Universite Paris-Sud, UMR8502 CNRS, Batiment 510, 91405, Orsay Cedex, France.
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