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  • 1
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    SOLUBILITY AND THERMODYNAMIC PROPERTIES OF CARBONATE-BEARING HYDROTALCITE-PYROAURITE SOLID SOLUTIONS WITH A 3:1 Mg/(Al+Fe) MOLE RATIO (2011)
    Clay Minerals Society
    Details
    Publication Date: 2011-10-05
    Description: The naturally occurring layered double hydroxides (LDH, or anionic clays) are of particular interest in environmental geochemistry because of their ability to retain hazardous cations and especially anions. However, incorporation of these minerals into predictive models of water-rock interaction in contaminant environments, including radioactive-waste repositories, is hampered by a lack of thermodynamic and stability data. To fill part of this gap the present authors have derived properties of one of the complex multicomponent solid solutions within the LDH family: the hydrotalcite-pyroaurite series, Mg3(Al1-xFex)(OH)8(CO3)0.5{middle dot}2.5H2O. Members of the hydrotalcite-pyroaurite series with fixed MgII/(AlIII+FeIII) = 3 and various FeIII/(FeIII+AlIII) ratios were synthesized by co-precipitation and dissolved in long-term experiments at 23{+/-}2{degrees}C and pH = 11.40{+/-}0.03. The chemical compositions of co-existing solid and aqueous phases were determined by inductively coupled plasma-optical emission spectroscopy, thermogravimetric analysis, and liquid scintillation counting of 55Fe tracers; X-ray diffraction and Raman were used to characterize the solids. Based on good evidence for reversible equilibrium in the experiments, the thermodynamic properties of the solid solution were examined using total-scale Lippmann solubility products, {sum}{Pi}T. No significant difference was observed between values of {sum}{Pi}T from co-precipitation and from dissolution experiments throughout the whole range of Fe/Al ratios. A simple ideal solid-solution model with similar end-member {sum}{Pi}T values (a regular model with 0 〈 WG 〈 2 kJ mol-1) was sufficient to describe the full range of intermediate mineral compositions. In turn, this yielded the first estimate of the standard Gibbs free energy of the pyroaurite end member, Go298,Pyr = -3882.60{+/-}2.00 kJ/mol, consistent with Go298,Htlc = -4339.85 kJ/mol of the hydrotalcite end member, and with the whole range of solubilities of the mixed phases. The molar volumes of the solid-solution at standard conditions were derived from X-ray data. Finally, Helgeson's method was used to extend the estimates of standard molar entropy and heat capacity of the end members over the pressure-temperature range 0-70{degrees}C and 1-100 bar.
    Print ISSN: 0009-8604
    Electronic ISSN: 1552-8367
    Topics: Geosciences
    Published by Clay Minerals Society
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  • 2
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    SOLUBILITY AND THERMODYNAMIC PROPERTIES OF CARBONATE-BEARING HYDROTALCITE-PYROAURITE SOLID SOLUTIONS WITH A 3:1 Mg/(Al+Fe) MOLE RATIO (2011)
    Clay Minerals Society
    Details
    Publication Date: 2011-10-05
    Description: The naturally occurring layered double hydroxides (LDH, or anionic clays) are of particular interest in environmental geochemistry because of their ability to retain hazardous cations and especially anions. However, incorporation of these minerals into predictive models of water-rock interaction in contaminant environments, including radioactive-waste repositories, is hampered by a lack of thermodynamic and stability data. To fill part of this gap the present authors have derived properties of one of the complex multicomponent solid solutions within the LDH family: the hydrotalcite-pyroaurite series, Mg3(Al1-xFex)(OH)8(CO3)0.5{middle dot}2.5H2O. Members of the hydrotalcite-pyroaurite series with fixed MgII/(AlIII+FeIII) = 3 and various FeIII/(FeIII+AlIII) ratios were synthesized by co-precipitation and dissolved in long-term experiments at 23{+/-}2{degrees}C and pH = 11.40{+/-}0.03. The chemical compositions of co-existing solid and aqueous phases were determined by inductively coupled plasma-optical emission spectroscopy, thermogravimetric analysis, and liquid scintillation counting of 55Fe tracers; X-ray diffraction and Raman were used to characterize the solids. Based on good evidence for reversible equilibrium in the experiments, the thermodynamic properties of the solid solution were examined using total-scale Lippmann solubility products, {sum}{Pi}T. No significant difference was observed between values of {sum}{Pi}T from co-precipitation and from dissolution experiments throughout the whole range of Fe/Al ratios. A simple ideal solid-solution model with similar end-member {sum}{Pi}T values (a regular model with 0 〈 WG 〈 2 kJ mol-1) was sufficient to describe the full range of intermediate mineral compositions. In turn, this yielded the first estimate of the standard Gibbs free energy of the pyroaurite end member, Go298,Pyr = -3882.60{+/-}2.00 kJ/mol, consistent with Go298,Htlc = -4339.85 kJ/mol of the hydrotalcite end member, and with the whole range of solubilities of the mixed phases. The molar volumes of the solid-solution at standard conditions were derived from X-ray data. Finally, Helgeson's method was used to extend the estimates of standard molar entropy and heat capacity of the end members over the pressure-temperature range 0-70{degrees}C and 1-100 bar.
    Print ISSN: 0009-8604
    Electronic ISSN: 1552-8367
    Topics: Geosciences
    Published by Clay Minerals Society
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  • 3
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    Structures of WNV and DENV NS1 [Microbiology] (2014)
    National Academy of Sciences
    Details
    Publication Date: 2014-03-19
    Description: The Flavivirus nonstructural protein 1 (NS1) is a conserved, membrane-associated and secreted glycoprotein with replication and immune evasion functions. Secreted NS1 is a hexameric, barrel-shaped lipoprotein that can bind back to the plasma membrane of cells. Antibodies targeting cell surface-associated NS1 can be protective in vivo in a manner dependent...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 4
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    Preschool program improves cognitive control (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-12-01
    Description: 〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2174918/" 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/PMC2174918/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Diamond, Adele -- Barnett, W Steven -- Thomas, Jessica -- Munro, Sarah -- R01 DA019685/DA/NIDA NIH HHS/ -- R01 DA019685-16A2/DA/NIDA NIH HHS/ -- R01 DA19685/DA/NIDA NIH HHS/ -- New York, N.Y. -- Science. 2007 Nov 30;318(5855):1387-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Psychiatry, University of British Columbia, Vancouver, BC V6T 2A1; BC Children's Hospital, Vancouver, BC, Canada. adele.diamond@ubc.ca〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18048670" target="_blank"〉PubMed〈/a〉
    Keywords: Attention ; Child, Preschool ; *Cognition ; *Curriculum ; *Early Intervention (Education) ; Female ; Humans ; Male ; Memory ; Neuropsychological Tests ; *Schools, Nursery
    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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  • 5
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    Interventions shown to aid executive function development in children 4 to 12 years old (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-08-20
    Description: To be successful takes creativity, flexibility, self-control, and discipline. Central to all those are executive functions, including mentally playing with ideas, giving a considered rather than an impulsive response, and staying focused. Diverse activities have been shown to improve children's executive functions: computerized training, noncomputerized games, aerobics, martial arts, yoga, mindfulness, and school curricula. All successful programs involve repeated practice and progressively increase the challenge to executive functions. Children with worse executive functions benefit most from these activities; thus, early executive-function training may avert widening achievement gaps later. To improve executive functions, focusing narrowly on them may not be as effective as also addressing emotional and social development (as do curricula that improve executive functions) and physical development (shown by positive effects of aerobics, martial arts, and yoga).〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3159917/" 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/PMC3159917/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Diamond, Adele -- Lee, Kathleen -- DA19685/DA/NIDA NIH HHS/ -- MH 071893/MH/NIMH NIH HHS/ -- R01 DA019685/DA/NIDA NIH HHS/ -- R01 DA019685-20/DA/NIDA NIH HHS/ -- R01 MH071893/MH/NIMH NIH HHS/ -- R01 MH071893-05/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 2011 Aug 19;333(6045):959-64. doi: 10.1126/science.1204529.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉University of British Columbia and Children's Hospital, Vancouver, BC V6T 2A1, Canada. adele.diamond@ubc.ca〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21852486" target="_blank"〉PubMed〈/a〉
    Keywords: Child ; Child, Preschool ; Computers ; Curriculum ; Emotions ; *Executive Function ; Female ; Humans ; Learning ; Male ; Martial Arts/education ; Memory, Short-Term
    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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  • 6
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    Common variants in MMP20 at 11q22.2 predispose to 11q deletion and neuroblastoma risk (2017)
    Springer Nature
    Details
    Publication Date: 2017-09-19
    Description: Common variants in MMP20 at 11q22.2 predispose to 11q deletion and neuroblastoma risk Nature Communications, Published online: 18 September 2017; doi:10.1038/s41467-017-00408-8 Chromosomal abnormalities such as 11q deletion are associated with poor prognosis in neuroblastoma. Here, the authors perform a genome-wide association study and identify an association between a variant within a Matrix metalloproteinase (MMP) gene member, MMP20, and 11q-deletion subtype neuroblastoma.
    Electronic ISSN: 2041-1723
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 7
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    Nucleotide sequence of a human Blym transforming gene activated in a Burkitt's lymphoma (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-08-03
    Description: The nucleotide sequence of a human Blym-1 transforming gene activated in a Burkitt's lymphoma cell line was determined. This sequence predicts a small protein of 58 amino acids that is 33 percent identical to the predicted product of chicken Blym-1, the activated transforming gene of chicken B cell lymphomas. Both the human and chicken Blym-1 genes exhibit significant identity to an amino-terminal region of transferrins.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Diamond, A -- Devine, J M -- Cooper, G M -- CA 07250/CA/NCI NIH HHS/ -- CA 28946/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1984 Aug 3;225(4661):516-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6330897" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Base Sequence ; Burkitt Lymphoma/*genetics ; Cell Line ; *Cell Transformation, Neoplastic ; DNA Restriction Enzymes ; Humans ; *Oncogenes ; Structure-Activity Relationship ; Transcription, Genetic ; Transferrin/genetics
    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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  • 8
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    Mapping of the human Blym-1 transforming gene activated in Burkitt lymphomas to chromosome 1 (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-01-13
    Description: Blym-1, a transforming gene detected by transfection of NIH 3T3 cells with DNA from Burkitt lymphomas, was mapped to the short arm of chromosome 1 (1p32) by chromosomal in situ hybridization. The Blym-1 gene was not physically linked to the cellular myc oncogene or to any of the immunoglobulin gene loci implicated in the characteristic chromosomal translocations in Burkitt lymphoma.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Morton, C C -- Taub, R -- Diamond, A -- Lane, M A -- Cooper, G M -- Leder, P -- CA-21082/CA/NCI NIH HHS/ -- CA-33108/CA/NCI NIH HHS/ -- GM-17088/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1984 Jan 13;223(4632):173-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6691143" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; Burkitt Lymphoma/*genetics ; Chromosome Aberrations ; Chromosome Mapping ; *Chromosomes, Human, 1-3 ; Genetic Linkage ; Humans ; Immunoglobulins/genetics ; Male ; Nucleic Acid Hybridization ; *Oncogenes ; Translocation, Genetic
    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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  • 9
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    Volcanostratigraphic Controls on the Occurrence of Massive Sulfide Deposits in the Semail Ophiolite, Oman (2014)
    Society of Economic Geologists (SEG)
    Details
    Publication Date: 2014-07-10
    Description: The Semail ophiolite in Oman is capped by up to 2 km of basaltic-andesitic lavas that host copper-dominant, Cyprus-type, volcanogenic massive sulfide (VMS) deposits. This study identifies multiple volcanostratigraphic horizons on which the deposits are situated, based on characterization of footwall and hanging-wall lavas from 16 deposits or deposit clusters. Comparison of field and petrographic features, compositions of igneous clinopyroxenes, and whole-rock geochemical signatures permits classification of the lavas within a modified version of the established regional volcanostratigraphy. Four extrusive units host deposits: Geotimes (earliest), Lasail, Alley, and Boninitic Alley (latest). The latter was previously known only at few localities, but this study reveals its regional extent and significance as a host for VMS deposits. The Geotimes and Lasail units represent Late Cretaceous, ocean spreading ridge and related off-axis volcanic environments, respectively. The Alley and Boninitic Alley units represent younger, subduction-related volcanism prior to Coniacian-Santonian obduction of the ophiolite. Our results show that VMS deposits occur on or near the Geotimes/Lasail and Geotimes/Alley contacts as well as entirely within the Geotimes, Lasail, Alley, and Boninitic Alley units. Highest Cu grades tend to occur in deposits lying on or within the Geotimes, whereas highest Au grades occur in deposits within the Boninitic Alley. In contrast to earlier studies, we conclude that essentially every horizon marking a hiatus in lava deposition in the Semail ophiolite, i.e., contacts between the four major eruptive units, and umbers and sedimentary chert layers within the units, has exploration potential for Cu-Au VMS deposits.
    Print ISSN: 0361-0128
    Topics: Geosciences
    Published by Society of Economic Geologists (SEG)
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  • 10
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    Polarization morphology of SiO masers in the circumstellar envelope of the asymptotic giant branch star R Cassiopeiae (2013)
    Oxford University Press
    Details
    Publication Date: 2013-04-13
    Description: Silicon monoxide maser emission has been detected in the circumstellar envelopes of many evolved stars in various vibrationally excited rotational transitions. It is considered a good tracer of the wind dynamics close to the photosphere of the star. We have investigated the polarization morphology in the circumstellar envelope of an asymptotic giant branch star, R Cassiopeiae. We mapped the linear and circular polarization of SiO masers in the v  = 1, J  = 1–0 transition. The linear polarization is typically a few tens of per cent, while the circular polarization is a few per cent. The fractional polarization tends to be higher for emission of lower total intensity. We found that, in some isolated features, the fractional linear polarization appears to exceed 100 per cent. We found the Faraday rotation is not negligible but is ~15°, which could produce small-scale structure in polarized emission, whilst the total intensity is smoother and partly resolved out. The polarization angles vary considerably from feature to feature, but there is a tendency to favour the directions parallel or perpendicular to the radial direction with respect to the star. In some features, the polarization angle abruptly flips 90°. We found that our data are in the regime g  〉〉 R  〉〉 , which indicates that the model of Goldreich, Keeley & Kwan can be applied and the polarization angle flip is caused when the magnetic field is at close to 55° to the line of sight. The polarization angle configuration is consistent with a radial magnetic field, although other configurations are not excluded.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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