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  • Articles  (31)
  • 2010-2014  (31)
  • Physics  (31)
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  • Articles  (31)
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  • 1
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    Equations of state in the Fe–FeSi system at high pressures and temperatures (2014)
    Wiley-Blackwell
    Details
    Publication Date: 2014-03-16
    Description: Earth's core is an iron-rich alloy containing several weight percent of light element(s), possibly including silicon. Therefore the high pressure-temperature equations of state of iron–silicon alloys can provide understanding of the properties of Earth's core. We performed X-ray diffraction experiments using laser-heated diamond anvil cells to achieve simultaneous high pressures and temperatures, up to ~200 GPa for Fe–9wt%Si alloy and ~145 GPa for stoichiometric FeSi. We determined equations of state of the D0 3 , hcp + B2, and hcp phases of Fe–9Si, and the B20 and B2 phases of FeSi. We also calculated equations of state of Fe, Fe 11 Si, Fe 5 Si, Fe 3 Si, and FeSi using ab initio methods, finding that iron and silicon atoms have similar volumes at high pressures. By comparing our experimentally-determined equations of state to the observed core density deficit, we find that the maximum amount of silicon in the outer core is ~11 wt%, while the maximum amount in the inner core is 6–8 wt%, for a purely Fe–Si–Ni core. Bulk sound speeds predicted from our equations of state also match those of the inner and outer core for similar ranges of compositions. We find a compositional contrast between the inner and outer core of 3.5–5.6 wt% silicon, depending on the seismological model used. Theoretical and experimental equations of state agree at high pressures. We find a good match to the observed density, density profile, and sound speed of the Earth's core, suggesting that silicon is a viable candidate for the dominant light element.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley-Blackwell on behalf of American Geophysical Union (AGU).
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  • 2
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    Strongly oriented Co3O4 thin films on MgO(100) and MgAl2O4(100) substrates by PE-CVD (2011)
    Royal Society of Chemistry (RSC)
    Details
    Publication Date: 2011-04-19
    Description: Strongly oriented Co3O4 thin films were grown on MgO(100) and MgAl2O4(100) by plasma CVD. XPS, SIMS, FE-SEM and XRD2 analyses evidenced that a tailored structural/morphological evolution could be obtained as a function of the process parameters. Davide Barreca, Anjana Devi, Roland A. Fischer, Daniela Bekermann, Alberto Gasparotto, Marco Gavagnin, Chiara Maccato, Eugenio Tondello, Elza Bontempi, Laura E. Depero, Cinzia Sada ( from CrystEngComm) Davide Barreca, CrystEngComm, 2011, DOI: 10.1039/C1CE05280B To cite this article before page numbers are assigned, use the DOI form of citation above. The content of this RSS Feed (c) The Royal Society of Chemistry
    Electronic ISSN: 1466-8033
    Topics: Geosciences , Physics
    Published by Royal Society of Chemistry (RSC)
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  • 3
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    Use of confocal fluorescence microscopy to compare different methods of modifying metal-organic framework (MOF) crystals with dyes (2011)
    Royal Society of Chemistry (RSC)
    Details
    Publication Date: 2011-03-29
    Description: Confocal laser scanning microscopy was used to determine the distribution of fluorescent dyes adsorbed within the bulk or bonded to the external surface of MOF crystals. Mingyan Ma, Annika Gross, Denise Zacher, Antonio Pinto, Heshmat Noei, Yuemin Wang, Roland A. Fischer, Nils Metzler-Nolte ( from CrystEngComm) Mingyan Ma, CrystEngComm, 2011, DOI: 10.1039/C0CE00416B To cite this article before page numbers are assigned, use the DOI form of citation above. The content of this RSS Feed (c) The Royal Society of Chemistry
    Electronic ISSN: 1466-8033
    Topics: Geosciences , Physics
    Published by Royal Society of Chemistry (RSC)
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  • 4
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    catena-Poly[[(tetrahydrofuran-κO)potassium]-μ-(η5:η5)-2,3,4,5-tetramethyl-1-n-pentylcyclopentadienyl] (2013)
    Wiley-Blackwell
    Details
    Publication Date: 2013-05-10
    Description: The title compound, [K(C 14 H 23 )(C 4 H 8 O)] n , comprises zigzag chains of alternating bridging 2,3,4,5-tetramethyl-1- n -pentylcyclopentadienyl ligands and potassium ions, with an ancillary tetrahydrofuran ligand in the coordination environment of potassium. The coordination polymer strands so formed extend by 2 1 screw symmetry in the b -axis direction. The chemically modified cyclopentadienyl ligand, with a tethered n -pentyl group, was synthesized from 2,3,4,5-tetramethylcyclopent-2-enone by a Grignard reaction.
    Print ISSN: 0108-2701
    Electronic ISSN: 1600-5759
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Published by Wiley-Blackwell on behalf of International Union of Crystallography (IUCr).
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  • 5
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    Monitoring the Coordination Modulator Shell at MOF Nanocrystals (2014)
    American Chemical Society (ACS)
    Details
    Publication Date: 2014-08-07
    Description: Crystal Growth & Design DOI: 10.1021/cg501025g
    Print ISSN: 1528-7483
    Electronic ISSN: 1528-7505
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Published by American Chemical Society (ACS)
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  • 6
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    Optical near-field interference in the excitation of a bowtie nanoantenna (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-06-09
    Description: Author(s): P. Melchior, D. Bayer, C. Schneider, A. Fischer, M. Rohmer, W. Pfeiffer, and M. Aeschlimann We show experimentally as well as in simulation that the phase-sensitive superposition of different plasmonic modes leads to a spatially controllable enhancement of the near-field inside and in the vicinity of a metallic nanostructure. Multiphoton photoemission electron microscopy maps the local nea... [Phys. Rev. B 83, 235407] Published Wed Jun 08, 2011
    Keywords: Surface physics, nanoscale physics, low-dimensional systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 7
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    The bonobo genome compared with the chimpanzee and human genomes (2012)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2012-06-23
    Description: Two African apes are the closest living relatives of humans: the chimpanzee (Pan troglodytes) and the bonobo (Pan paniscus). Although they are similar in many respects, bonobos and chimpanzees differ strikingly in key social and sexual behaviours, and for some of these traits they show more similarity with humans than with each other. Here we report the sequencing and assembly of the bonobo genome to study its evolutionary relationship with the chimpanzee and human genomes. We find that more than three per cent of the human genome is more closely related to either the bonobo or the chimpanzee genome than these are to each other. These regions allow various aspects of the ancestry of the two ape species to be reconstructed. In addition, many of the regions that overlap genes may eventually help us understand the genetic basis of phenotypes that humans share with one of the two apes to the exclusion of the other.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3498939/" 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/PMC3498939/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Prufer, Kay -- Munch, Kasper -- Hellmann, Ines -- Akagi, Keiko -- Miller, Jason R -- Walenz, Brian -- Koren, Sergey -- Sutton, Granger -- Kodira, Chinnappa -- Winer, Roger -- Knight, James R -- Mullikin, James C -- Meader, Stephen J -- Ponting, Chris P -- Lunter, Gerton -- Higashino, Saneyuki -- Hobolth, Asger -- Dutheil, Julien -- Karakoc, Emre -- Alkan, Can -- Sajjadian, Saba -- Catacchio, Claudia Rita -- Ventura, Mario -- Marques-Bonet, Tomas -- Eichler, Evan E -- Andre, Claudine -- Atencia, Rebeca -- Mugisha, Lawrence -- Junhold, Jorg -- Patterson, Nick -- Siebauer, Michael -- Good, Jeffrey M -- Fischer, Anne -- Ptak, Susan E -- Lachmann, Michael -- Symer, David E -- Mailund, Thomas -- Schierup, Mikkel H -- Andres, Aida M -- Kelso, Janet -- Paabo, Svante -- 090532/Wellcome Trust/United Kingdom -- 090532/Z/09/Z/Wellcome Trust/United Kingdom -- 2R01GM077117-04A1/GM/NIGMS NIH HHS/ -- HG002385/HG/NHGRI NIH HHS/ -- MC_U137761446/Medical Research Council/United Kingdom -- R01 GM077117/GM/NIGMS NIH HHS/ -- R01 HG002385/HG/NHGRI NIH HHS/ -- Howard Hughes Medical Institute/ -- Intramural NIH HHS/ -- England -- Nature. 2012 Jun 28;486(7404):527-31. doi: 10.1038/nature11128.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Max Planck Institute for Evolutionary Anthropology, D-04103 Leipzig, Germany. pruefer@eva.mpg.de〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22722832" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; DNA Transposable Elements/genetics ; *Evolution, Molecular ; Gene Duplication/genetics ; Genetic Variation/*genetics ; Genome/*genetics ; Genome, Human/*genetics ; Genotype ; Humans ; Molecular Sequence Data ; Pan paniscus/*genetics ; Pan troglodytes/*genetics ; Phenotype ; Phylogeny ; Species Specificity
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 8
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    MicroRNA-34a regulates cardiac ageing and function (2013)
    Nature Publishing Group (NPG)
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    Publication Date: 2013-02-22
    Description: Ageing is the predominant risk factor for cardiovascular diseases and contributes to a significantly worse outcome in patients with acute myocardial infarction. MicroRNAs (miRNAs) have emerged as crucial regulators of cardiovascular function and some miRNAs have key roles in ageing. We propose that altered expression of miRNAs in the heart during ageing contributes to the age-dependent decline in cardiac function. Here we show that miR-34a is induced in the ageing heart and that in vivo silencing or genetic deletion of miR-34a reduces age-associated cardiomyocyte cell death. Moreover, miR-34a inhibition reduces cell death and fibrosis following acute myocardial infarction and improves recovery of myocardial function. Mechanistically, we identified PNUTS (also known as PPP1R10) as a novel direct miR-34a target, which reduces telomere shortening, DNA damage responses and cardiomyocyte apoptosis, and improves functional recovery after acute myocardial infarction. Together, these results identify age-induced expression of miR-34a and inhibition of its target PNUTS as a key mechanism that regulates cardiac contractile function during ageing and after acute myocardial infarction, by inducing DNA damage responses and telomere attrition.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Boon, Reinier A -- Iekushi, Kazuma -- Lechner, Stefanie -- Seeger, Timon -- Fischer, Ariane -- Heydt, Susanne -- Kaluza, David -- Treguer, Karine -- Carmona, Guillaume -- Bonauer, Angelika -- Horrevoets, Anton J G -- Didier, Nathalie -- Girmatsion, Zenawit -- Biliczki, Peter -- Ehrlich, Joachim R -- Katus, Hugo A -- Muller, Oliver J -- Potente, Michael -- Zeiher, Andreas M -- Hermeking, Heiko -- Dimmeler, Stefanie -- England -- Nature. 2013 Mar 7;495(7439):107-10. doi: 10.1038/nature11919. Epub 2013 Feb 20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute for Cardiovascular Regeneration, Centre of Molecular Medicine, Goethe University Frankfurt, 60590 Frankfurt, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23426265" target="_blank"〉PubMed〈/a〉
    Keywords: Aging/genetics/pathology/*physiology ; Animals ; Apoptosis ; DNA Damage ; Fibrosis/genetics/pathology ; Gene Deletion ; *Gene Expression Regulation ; Gene Knockout Techniques ; Genetic Therapy ; Heart/*physiology ; Mice ; Mice, Inbred C57BL ; MicroRNAs/*genetics/metabolism ; Myocardial Infarction/genetics/pathology/therapy ; Myocardium/cytology/*metabolism/pathology ; Myocytes, Cardiac/cytology/metabolism/pathology ; Substrate Specificity ; Telomere/genetics/metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 9
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    The same frequency of planets inside and outside open clusters of stars (2013)
    Nature Publishing Group (NPG)
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    Publication Date: 2013-06-28
    Description: Most stars and their planets form in open clusters. Over 95 per cent of such clusters have stellar densities too low (less than a hundred stars per cubic parsec) to withstand internal and external dynamical stresses and fall apart within a few hundred million years. Older open clusters have survived by virtue of being richer and denser in stars (1,000 to 10,000 per cubic parsec) when they formed. Such clusters represent a stellar environment very different from the birthplace of the Sun and other planet-hosting field stars. So far more than 800 planets have been found around Sun-like stars in the field. The field planets are usually the size of Neptune or smaller. In contrast, only four planets have been found orbiting stars in open clusters, all with masses similar to or greater than that of Jupiter. Here we report observations of the transits of two Sun-like stars by planets smaller than Neptune in the billion-year-old open cluster NGC6811. This demonstrates that small planets can form and survive in a dense cluster environment, and implies that the frequency and properties of planets in open clusters are consistent with those of planets around field stars in the Galaxy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Meibom, Soren -- Torres, Guillermo -- Fressin, Francois -- Latham, David W -- Rowe, Jason F -- Ciardi, David R -- Bryson, Steven T -- Rogers, Leslie A -- Henze, Christopher E -- Janes, Kenneth -- Barnes, Sydney A -- Marcy, Geoffrey W -- Isaacson, Howard -- Fischer, Debra A -- Howell, Steve B -- Horch, Elliott P -- Jenkins, Jon M -- Schuler, Simon C -- Crepp, Justin -- England -- Nature. 2013 Jul 4;499(7456):55-8. doi: 10.1038/nature12279. Epub 2013 Jun 26.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA. smeibom@cfa.harvard.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23803764" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 10
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    Gene therapy: Repair and replace (2014)
    Nature Publishing Group (NPG)
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    Publication Date: 2014-05-30
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fischer, Alain -- England -- Nature. 2014 Jun 12;510(7504):226-7. doi: 10.1038/nature13344. Epub 2014 May 28.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Imagine Institute, Hopital Necker-Enfants Malades, Paris 75015, France, and at the College de France, Paris.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24870243" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Gene Targeting/*methods ; Genome, Human/*genetics ; Hematopoietic Stem Cells/*cytology/*metabolism ; Humans ; Male ; Targeted Gene Repair/*methods ; X-Linked Combined Immunodeficiency Diseases/*genetics
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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