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  • 1
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    Extracellular proteins limit the dispersal of biogenic nanoparticles (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-06-16
    Description: 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.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Moreau, John W -- Weber, Peter K -- Martin, Michael C -- Gilbert, Benjamin -- Hutcheon, Ian D -- Banfield, Jillian F -- New York, N.Y. -- Science. 2007 Jun 15;316(5831):1600-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth and Planetary Science, University of California Berkeley, Berkeley, CA 94720, USA. jwmoreau@usgs.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17569859" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acids/chemistry ; Bacteria/chemistry/metabolism ; Bacterial Proteins/*chemistry/metabolism ; *Biofilms ; Chemical Precipitation ; Microscopy, Electron, Transmission ; *Nanoparticles ; Nitrogen/analysis ; Oxidation-Reduction ; Particle Size ; Spectrometry, Mass, Secondary Ion ; Spectroscopy, Fourier Transform Infrared ; *Sulfides/chemistry ; *Zinc Compounds/chemistry
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Ultrafast dynamics of vibrational symmetry breaking in a charge-ordered nickelate (2017)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2017-11-25
    Description: The ability to probe symmetry-breaking transitions on their natural time scales is one of the key challenges in nonequilibrium physics. Stripe ordering represents an intriguing type of broken symmetry, where complex interactions result in atomic-scale lines of charge and spin density. Although phonon anomalies and periodic distortions attest the importance of electron-phonon coupling in the formation of stripe phases, a direct time-domain view of vibrational symmetry breaking is lacking. We report experiments that track the transient multi-terahertz response of the model stripe compound La 1.75 Sr 0.25 NiO 4 , yielding novel insight into its electronic and structural dynamics following an ultrafast optical quench. We find that although electronic carriers are immediately delocalized, the crystal symmetry remains initially frozen—as witnessed by time-delayed suppression of zone-folded Ni–O bending modes acting as a fingerprint of lattice symmetry. Longitudinal and transverse vibrations react with different speeds, indicating a strong directionality and an important role of polar interactions. The hidden complexity of electronic and structural coupling during stripe melting and formation, captured here within a single terahertz spectrum, opens new paths to understanding symmetry-breaking dynamics in solids.
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
    Published by American Association for the Advancement of Science (AAAS)
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