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  • 1
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    Phonon anharmonicity and negative thermal expansion in SnSe (2016)
    American Physical Society (APS)
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    Publication Date: 2016-08-11
    Description: Author(s): Dipanshu Bansal, Jiawang Hong, Chen W. Li, Andrew F. May, Wallace Porter, Michael Y. Hu, Douglas L. Abernathy, and Olivier Delaire The anharmonic phonon properties of SnSe in the P n m a phase were investigated with a combination of experiments and first-principles simulations. Using inelastic neutron scattering (INS) and nuclear resonant inelastic X-ray scattering (NRIXS), we have measured the phonon dispersions and density of st… [Phys. Rev. B 94, 054307] Published Tue Aug 09, 2016
    Keywords: Dynamics, dynamical systems, lattice effects
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Moments in nuclear resonant inelastic x-ray scattering and their applications (2013)
    American Physical Society (APS)
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    Publication Date: 2013-02-09
    Description: Author(s): Michael Y. Hu, Thomas S. Toellner, Nicolas Dauphas, E. Ercan Alp, and Jiyong Zhao Sum rules of the moments of the nuclear resonant inelastic x-ray scattering (NRIXS) spectrum provide means of data analysis and information on atomic dynamics. We extend existing work by calculating the third and fourth moment beyond the harmonic approximation and show that NRIXS can provide a direc... [Phys. Rev. B 87, 064301] Published Fri Feb 08, 2013
    Keywords: Dynamics, dynamical systems, lattice effects
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 3
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    Vibrational dynamics of the host framework in Sn clathrates (2014)
    American Physical Society (APS)
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    Publication Date: 2014-09-17
    Description: Author(s): Bogdan M. Leu, Mihai Sturza, Michael Y. Hu, David Gosztola, Volodymyr Baran, Thomas F. Fässler, and E. Ercan Alp We use nuclear resonance inelastic x-ray scattering (NRIXS), a relatively new, synchrotron-based, isotope-specific technique in combination with a more traditional one, Raman spectroscopy, to probe the vibrational dynamics of the host frameworks in two Zintl clathrates: K8Zn4Sn42 (KZS) and Ba8Ga16Sn... [Phys. Rev. B 90, 104304] Published Tue Sep 16, 2014
    Keywords: Dynamics, dynamical systems, lattice effects
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 4
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    Structure of precursor-bound NifEN: a nitrogenase FeMo cofactor maturase/insertase (2011)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2011-01-08
    Description: NifEN plays an essential role in the biosynthesis of the nitrogenase iron-molybdenum (FeMo) cofactor (M cluster). It is an alpha(2)beta(2) tetramer that is homologous to the catalytic molybdenum-iron (MoFe) protein (NifDK) component of nitrogenase. NifEN serves as a scaffold for the conversion of an iron-only precursor to a matured form of the M cluster before delivering the latter to its target location within NifDK. Here, we present the structure of the precursor-bound NifEN of Azotobacter vinelandii at 2.6 angstrom resolution. From a structural comparison of NifEN with des-M-cluster NifDK and holo NifDK, we propose similar pathways of cluster insertion for the homologous NifEN and NifDK proteins.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3138709/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3138709/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kaiser, Jens T -- Hu, Yilin -- Wiig, Jared A -- Rees, Douglas C -- Ribbe, Markus W -- GM-45162/GM/NIGMS NIH HHS/ -- GM-67626/GM/NIGMS NIH HHS/ -- R01 GM067626/GM/NIGMS NIH HHS/ -- R01 GM067626-09/GM/NIGMS NIH HHS/ -- R37 GM045162/GM/NIGMS NIH HHS/ -- R37 GM045162-22/GM/NIGMS NIH HHS/ -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2011 Jan 7;331(6013):91-4. doi: 10.1126/science.1196954.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Chemistry and Chemical Engineering, California Institute of Technology, Mail Code 114-96, Pasadena, CA 91125, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21212358" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Azotobacter vinelandii/*chemistry/enzymology ; Bacterial Proteins/*chemistry/metabolism ; Crystallography, X-Ray ; Models, Molecular ; Molecular Sequence Data ; Molybdoferredoxin/*chemistry/metabolism ; Nitrogenase/*chemistry/metabolism ; Protein Multimerization ; Protein Precursors/chemistry/metabolism ; Protein Structure, Quaternary ; Protein Structure, Tertiary
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    X-ray emission spectroscopy evidences a central carbon in the nitrogenase iron-molybdenum cofactor (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-11-19
    Description: Nitrogenase is a complex enzyme that catalyzes the reduction of dinitrogen to ammonia. Despite insight from structural and biochemical studies, its structure and mechanism await full characterization. An iron-molybdenum cofactor (FeMoco) is thought to be the site of dinitrogen reduction, but the identity of a central atom in this cofactor remains unknown. Fe Kbeta x-ray emission spectroscopy (XES) of intact nitrogenase MoFe protein, isolated FeMoco, and the FeMoco-deficient nifB protein indicates that among the candidate atoms oxygen, nitrogen, and carbon, it is carbon that best fits the XES data. The experimental XES is supported by computational efforts, which show that oxidation and spin states do not affect the assignment of the central atom to C(4-). Identification of the central atom will drive further studies on its role in catalysis.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3800678/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3800678/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lancaster, Kyle M -- Roemelt, Michael -- Ettenhuber, Patrick -- Hu, Yilin -- Ribbe, Markus W -- Neese, Frank -- Bergmann, Uwe -- DeBeer, Serena -- R01 GM067626/GM/NIGMS NIH HHS/ -- R01-GM 67626/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2011 Nov 18;334(6058):974-7. doi: 10.1126/science.1206445.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22096198" target="_blank"〉PubMed〈/a〉
    Keywords: Azotobacter vinelandii/chemistry ; Biocatalysis ; Carbon/*chemistry ; Ligands ; Models, Molecular ; Molecular Structure ; Molybdoferredoxin/*chemistry/metabolism ; Nitrogen/chemistry ; Oxidation-Reduction ; Oxygen/chemistry ; Spectrometry, X-Ray Emission
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
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    Chitin-induced dimerization activates a plant immune receptor (2012)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2012-06-02
    Description: Pattern recognition receptors confer plant resistance to pathogen infection by recognizing the conserved pathogen-associated molecular patterns. The cell surface receptor chitin elicitor receptor kinase 1 of Arabidopsis (AtCERK1) directly binds chitin through its lysine motif (LysM)-containing ectodomain (AtCERK1-ECD) to activate immune responses. The crystal structure that we solved of an AtCERK1-ECD complexed with a chitin pentamer reveals that their interaction is primarily mediated by a LysM and three chitin residues. By acting as a bivalent ligand, a chitin octamer induces AtCERK1-ECD dimerization that is inhibited by shorter chitin oligomers. A mutation attenuating chitin-induced AtCERK1-ECD dimerization or formation of nonproductive AtCERK1 dimer by overexpression of AtCERK1-ECD compromises AtCERK1-mediated signaling in plant cells. Together, our data support the notion that chitin-induced AtCERK1 dimerization is critical for its activation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Liu, Tingting -- Liu, Zixu -- Song, Chuanjun -- Hu, Yunfei -- Han, Zhifu -- She, Ji -- Fan, Fangfang -- Wang, Jiawei -- Jin, Changwen -- Chang, Junbiao -- Zhou, Jian-Min -- Chai, Jijie -- New York, N.Y. -- Science. 2012 Jun 1;336(6085):1160-4. doi: 10.1126/science.1218867.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Graduate Program in Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22654057" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylglucosamine/chemistry/metabolism ; Amino Acid Motifs ; Amino Acid Sequence ; Arabidopsis/immunology/*metabolism ; Arabidopsis Proteins/*chemistry/genetics/*metabolism ; Binding Sites ; Chitin/chemistry/*metabolism ; Crystallography, X-Ray ; Hydrogen Bonding ; Ligands ; Models, Molecular ; Molecular Sequence Data ; Mutant Proteins/chemistry/metabolism ; Phosphorylation ; Plants, Genetically Modified ; Protein Multimerization ; Protein Structure, Tertiary ; Protein-Serine-Threonine Kinases/*chemistry/genetics/*metabolism ; Receptors, Pattern Recognition/*chemistry/genetics/*metabolism ; Signal Transduction
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
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    Influence of interfaces on the phonon density of states of nanoscale metallic multilayers: Phonon confinement and localization (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-07-21
    Description: Author(s): W. Keune, Sampyo Hong, M. Y. Hu, J. Zhao, T. S. Toellner, E. E. Alp, W. Sturhahn, T. S. Rahman, and B. Roldan Cuenya Isotope-selective Fe 57 nuclear resonant inelastic x-ray scattering (NRIXS) measurements and atomic-layer resolved density functional theory (DFT) calculations were used to investigate the effect of interfaces on the vibrational (phonon) density of states (VDOS) of (001)-oriented nanoscale Fe/Ag and ... [Phys. Rev. B 98, 024308] Published Fri Jul 20, 2018
    Keywords: Dynamics, dynamical systems, lattice effects
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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