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  • PANGAEA  (49)
  • American Association for the Advancement of Science (AAAS)  (3)
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  • 1
    Publication Date: 2010-11-06
    Description: Electrons in graphene behave like Dirac fermions, permitting phenomena from high-energy physics to be studied in a solid-state setting. A key question is whether or not these fermions are critically influenced by Coulomb correlations. We performed inelastic x-ray scattering experiments on crystals of graphite and applied reconstruction algorithms to image the dynamical screening of charge in a freestanding graphene sheet. We found that the polarizability of the Dirac fermions is amplified by excitonic effects, improving screening of interactions between quasiparticles. The strength of interactions is characterized by a scale-dependent, effective fine-structure constant, alpha(g)* (k,omega), the value of which approaches 0.14 +/- 0.092 ~ 1/7 at low energy and large distances. This value is substantially smaller than the nominal alpha(g) = 2.2, suggesting that, on the whole, graphene is more weakly interacting than previously believed.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Reed, James P -- Uchoa, Bruno -- Joe, Young Il -- Gan, Yu -- Casa, Diego -- Fradkin, Eduardo -- Abbamonte, Peter -- New York, N.Y. -- Science. 2010 Nov 5;330(6005):805-8. doi: 10.1126/science.1190920.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois, Urbana, IL 61801, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21051634" target="_blank"〉PubMed〈/a〉
    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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  • 2
    Publication Date: 2010-09-18
    Description: Simian immunodeficiency virus (SIV) lineages have been identified that are endemic to Bioko Island. The time the island formed offers a geological time scale calibration point for dating the most recent common ancestor of SIV. The Bioko viruses cover the whole range of SIV genetic diversity, and each Bioko SIV clade is most closely related to viruses circulating in hosts of the same genus on the African mainland rather than to SIVs of other Bioko species. Our phylogeographic approach establishes that SIV is ancient and at least 32,000 years old. Our conservative calibration point and analyses of gene sequence saturation and dating bias suggest it may be much older.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Worobey, Michael -- Telfer, Paul -- Souquiere, Sandrine -- Hunter, Meredith -- Coleman, Clint A -- Metzger, Michael J -- Reed, Patricia -- Makuwa, Maria -- Hearn, Gail -- Honarvar, Shaya -- Roques, Pierre -- Apetrei, Cristian -- Kazanji, Mirdad -- Marx, Preston A -- 1R01AI27698/AI/NIAID NIH HHS/ -- 1R01AI44596/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 2010 Sep 17;329(5998):1487. doi: 10.1126/science.1193550.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉University of Arizona, Tucson, AZ 85721, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20847261" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cercopithecidae/*virology ; Cercopithecus/virology ; Colobus/virology ; Equatorial Guinea ; Evolution, Molecular ; Genes, pol ; Genetic Variation ; Geography ; Mandrillus/virology ; Molecular Sequence Data ; Phylogeny ; Simian Acquired Immunodeficiency Syndrome/*virology ; Simian Immunodeficiency Virus/*classification/*genetics/isolation & purification ; Time Factors
    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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  • 3
    Publication Date: 1978-08-04
    Description: We used an assay in vitro to investigate the possible role of streptococcal adherence to human pharyngeal cells in the pathogenesis of acute rheumatic fever. There was no difference in adherence of rheumatic fever-associated and non-associated strains of group A streptococci to pooled pharyngeal cells of normal people. Likewise, streptococci not associated with rheumatic fever adhered equally well to cells taken from normal people and from patients with rheumatic heart disease. However, the pharyngeal cells of all nine rheumatic heart disease patients tested had increased avidity for adherence for a rheumatic fever-associated strain of streptococcus compared to the pharyngeal cells obtained from age- and sex-matched controls. Increased streptococcal adherence to pharyngeal cells of rheumatic fever-prone patients may play a role in the pathogenesis of rheumatic fever.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Selinger, D S -- Julie, N -- Reed, W P -- Williams, R C Jr -- New York, N.Y. -- Science. 1978 Aug 4;201(4354):455-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/351810" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Female ; Humans ; Male ; Middle Aged ; Pharyngeal Diseases/complications/microbiology ; Pharynx/*microbiology ; Rheumatic Fever/*etiology/microbiology ; Streptococcus pyogenes/*physiology
    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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  • 4
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    PANGAEA
    Publication Date: 2023-06-27
    Keywords: 16 km ENE Cape Roberts; Age, comment; Age model; Age model, preliminary; Cape Roberts Project; Core wireline system; CRP; CRP-1; CWS; DEPTH, sediment/rock; off Cape Roberts, Ross Sea, Antarctica; Sampling/drilling ice
    Type: Dataset
    Format: text/tab-separated-values, 24 data points
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  • 5
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    PANGAEA
    In:  Supplement to: Hodson, Timothy O; Powell, Ross; Brachfield, Stefanie; Tulaczyk, Slawek; Scherer, Reed P; WISSARD Science Team (2016): Physical processes in Subglacial Lake Whillans, West Antarctica: inferences from sediment cores. Earth and Planetary Science Letters, 444, 56-63, https://doi.org/10.1016/j.epsl.2016.03.036
    Publication Date: 2023-06-27
    Description: The hydrologic system beneath the Antarctic Ice Sheet is thought to influence both the dynamics and distribution of fast flowing ice streams, which discharge most of the ice lost by the ice sheet. Despite considerable interest in understanding this subglacial network and its affect on ice flow, in situ observations from the ice sheet bed are exceedingly rare. Here we describe the first sediment cores recovered from an active subglacial lake. The lake, known as Subglacial Lake Whillans, is part of a broader, dynamic hydrologic network beneath the Whillans Ice Stream in West Antarctica. Even though "floods" pass through the lake, the lake floor shows no evidence of erosion or deposition by flowing water. By inference, these floods must have insufficient energy to erode or transport significant volumes of sediment coarser than silt. Consequently, water flow beneath the region is probably incapable of incising continuous channels into the bed and instead follows preexisting subglacial topography and surface slope. Sediment on the lake floor consists of till deposited during intermittent grounding of the ice stream following flood events. The fabrics within the till are weaker than those thought to develop in thick deforming beds suggesting subglacial sediment fluxes across the ice plain are currently low and unlikely to have a large stabilizing effect on the ice stream's grounding zone.
    Keywords: MUC; MultiCorer; PC; PCOR; Percussion corer; Piston corer; SLW1_PC1; SLW1_PEC1; SLW1_SLW_MC1A; SLW1_SLW_MC3A
    Type: Dataset
    Format: application/zip, 15 datasets
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  • 6
    Publication Date: 2023-07-10
    Keywords: Aluminium; Argon; Barium; Calcium; Cerium; Chlorine; Chromium; Copper; DEPTH, sediment/rock; Gallium; Germanium; Gold; Hafnium; Iron; Lead; Manganese; MUC; MultiCorer; Neodymium; Palladium; Phosphorus; Platinum; Position, length; Potassium; Rubidium; Samarium; Silicon; SLW1_SLW_MC3A; Strontium; Sulfur; Tantalum; Thorium; Titanium; Tungsten; Uranium; Vanadium; X-ray fluorescence ITRAX core scanner; Yttrium; Zinc; Zirconium
    Type: Dataset
    Format: text/tab-separated-values, 21980 data points
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  • 7
    Publication Date: 2023-06-27
    Keywords: Demagnetization step; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Event label; Maximum angular deviation; MUC; MultiCorer; NRM, Declination after demagnetization; NRM, Inclination after demagnetization; PC; Piston corer; Principal component analyses (PCA); SLW1_PC1; SLW1_SLW_MC3A
    Type: Dataset
    Format: text/tab-separated-values, 28 data points
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  • 8
    Publication Date: 2023-06-27
    Keywords: Declination of principle axis K1; Declination of principle axis K2; Declination of principle axis K3; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Event label; Inclination of principle axis K1; Inclination of principle axis K2; Inclination of principle axis K3; Kappabridge, AGICO KLY-4; Magnetic susceptibility; MUC; MultiCorer; PC; PCOR; Percussion corer; Piston corer; Principle axes K1 of normalized anisotropy tensor; Principle axes K2 of normalized anisotropy tensor; Principle axes K3 of normalized anisotropy tensor; SLW1_PC1; SLW1_PEC1; SLW1_SLW_MC1A; SLW1_SLW_MC3A
    Type: Dataset
    Format: text/tab-separated-values, 351 data points
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  • 9
    Publication Date: 2023-06-27
    Keywords: PC; Piston corer; SLW1_PC1
    Type: Dataset
    Format: unknown
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  • 10
    Publication Date: 2023-06-27
    Keywords: MUC; MultiCorer; SLW1_SLW_MC3A
    Type: Dataset
    Format: unknown
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