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  • 1
    Monograph available for loan
    Monograph available for loan
    Cambridge : British Antarctic Survey
    Call number: AWI A4-94-0031
    Type of Medium: Monograph available for loan
    Pages: 70 S. : graph. Darst.
    ISBN: 0856651540
    Branch Library: AWI Library
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  • 2
    Publication Date: 2013-08-01
    Description: On 23 June 2010, a moderate earthquake with M w  5.2 occurred near the town of Val-des-Bois, Quebec, Canada, ~60 km northeast of Ottawa, Ontario. The earthquake generated excellent crustal Rayleigh-wave records. We divided the 54 seismic stations that recorded clear Rayleigh-wave trains into 14 groups by station azimuth. In each group, we measured the Rayleigh-wave dispersion data station by station and formed one dispersion data file for the inversion. In this way, we obtained 14 crustal velocity models around the epicenter. We compared all 14 models and found that there are low-velocity layers in the top 10 km on the north side of the Ottawa–Bonnechere graben. Based on model similarity, we formed one model for the north side by averaging the north-side models and another model for the south side by averaging the south-side models. The separation of the north-side and south-side models appears to follow the Ottawa–Bonnechere graben. In the top 10 km, the velocities in the south model are obviously slower than those in the north model.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences , Physics
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  • 3
    Publication Date: 2015-06-15
    Description: We report the discovery and characterization of a new M-dwarf binary, with component masses and radii of $M_1 = 0.244_{-0.003}^{+0.003} \, \mathrm{M}_{\odot }$ , $R_1 = 0.261_{-0.009}^{+0.006} \, \mathrm{R}_{\odot }$ , $M_2 = 0.179_{-0.001}^{+0.002} \, \mathrm{M}_{\odot }$ , $R_2 = 0.218 _{-0.011}^{+0.007} \, \mathrm{R}_{\odot }$ , and orbital period of ~4.1 d. The M-dwarf binary HATS551–027 (LP 837–20) was identified as an eclipsing binary by the HATSouth survey, and characterized by a series of high-precision photometric observations of the eclipse events, and spectroscopic determinations of the atmospheric parameters and radial velocity orbits. HATS551–027 is one of few systems with both stellar components lying in the fully convective regime of very low mass stars, and can serve as a test for stellar interior models. The radius of HATS551–027A is consistent with models to 1, whilst HATS551–027B is inflated by 9 per cent at 2 significance. We measure the effective temperatures for the two stellar components to be T eff, 1  = 3190 ± 100 K and T eff, 2  = 2990 ± 110 K; both are slightly cooler than theoretical models predict, but consistent with other M-dwarfs of similar masses that have previously been studied. We also measure significant H α emission from both components of the binary system, and discuss this in the context of the correlation between stellar activity and the discrepancies between the observed and model temperatures.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
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  • 4
    Publication Date: 2015-05-20
    Description: The CD33 single-nucleotide polymorphism (SNP) rs3865444 has been associated with the risk of Alzheimer's disease (AD). Rs3865444 is in linkage disequilibrium with rs12459419 which has been associated with efficacy of an acute myeloid leukemia (AML) chemotherapeutic agent based on a CD33 antibody. We seek to evaluate the extent to which CD33 genetics in AD and AML can inform one another and advance human disease therapy. We have previously shown that these SNPs are associated with skipping of CD33 exon 2 in brain mRNA. Here, we report that these CD33 SNPs are associated with exon 2 skipping in leukocytes from AML patients and with a novel CD33 splice variant that retains CD33 intron 1. Each copy of the minor rs12459419T allele decreases prototypic full-length CD33 expression by ~25% and decreases the AD odds ratio by ~0.10. These results suggest that CD33 antagonists may be useful in reducing AD risk. CD33 inhibitors may include humanized CD33 antibodies such as lintuzumab which was safe but ineffective in AML clinical trials. Here, we report that lintuzumab downregulates cell-surface CD33 by 80% in phorbol-ester differentiated U937 cells, at concentrations as low as 10 ng/ml. Overall, we propose a model wherein a modest effect on RNA splicing is sufficient to mediate the CD33 association with AD risk and suggest the potential for an anti-CD33 antibody as an AD-relevant pharmacologic agent.
    Print ISSN: 0964-6906
    Electronic ISSN: 1460-2083
    Topics: Biology , Medicine
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  • 5
    Publication Date: 2012-10-03
    Description: Fundamental differences in the distribution of oceans and landmasses in the Northern and Southern Hemispheres potentially impact patterns of biological diversity in the two areas. The evolutionary history of conifers provides an opportunity to explore these dynamics, because the majority of extant conifer species belong to lineages that have been...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 6
    Publication Date: 2015-03-31
    Description: In response to adenosine 5'-diphosphate, the P2Y1 receptor (P2Y1R) facilitates platelet aggregation, and thus serves as an important antithrombotic drug target. Here we report the crystal structures of the human P2Y1R in complex with a nucleotide antagonist MRS2500 at 2.7 A resolution, and with a non-nucleotide antagonist BPTU at 2.2 A resolution. The structures reveal two distinct ligand-binding sites, providing atomic details of P2Y1R's unique ligand-binding modes. MRS2500 recognizes a binding site within the seven transmembrane bundle of P2Y1R, which is different in shape and location from the nucleotide binding site in the previously determined structure of P2Y12R, representative of another P2YR subfamily. BPTU binds to an allosteric pocket on the external receptor interface with the lipid bilayer, making it the first structurally characterized selective G-protein-coupled receptor (GPCR) ligand located entirely outside of the helical bundle. These high-resolution insights into P2Y1R should enable discovery of new orthosteric and allosteric antithrombotic drugs with reduced adverse effects.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4408927/" 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/PMC4408927/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhang, Dandan -- Gao, Zhan-Guo -- Zhang, Kaihua -- Kiselev, Evgeny -- Crane, Steven -- Wang, Jiang -- Paoletta, Silvia -- Yi, Cuiying -- Ma, Limin -- Zhang, Wenru -- Han, Gye Won -- Liu, Hong -- Cherezov, Vadim -- Katritch, Vsevolod -- Jiang, Hualiang -- Stevens, Raymond C -- Jacobson, Kenneth A -- Zhao, Qiang -- Wu, Beili -- U54 GM094618/GM/NIGMS NIH HHS/ -- U54GM094618/GM/NIGMS NIH HHS/ -- Z01 DK031116-21/Intramural NIH HHS/ -- Z01DK031116-26/DK/NIDDK NIH HHS/ -- ZIA DK031116-26/Intramural NIH HHS/ -- England -- Nature. 2015 Apr 16;520(7547):317-21. doi: 10.1038/nature14287. Epub 2015 Mar 30.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Pudong, Shanghai 201203, China. ; Molecular Recognition Section, Laboratory of Bioorganic Chemistry, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA. ; Bridge Institute, Department of Chemistry, University of Southern California, Los Angeles, California 90089, USA. ; Bridge Institute, Department of Biological Sciences, University of Southern California, Los Angeles, California 90089, USA. ; Drug Discovery and Design Center, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Pudong, Shanghai 201203, China. ; 1] Bridge Institute, Department of Chemistry, University of Southern California, Los Angeles, California 90089, USA [2] Bridge Institute, Department of Biological Sciences, University of Southern California, Los Angeles, California 90089, USA [3] iHuman Institute, ShanghaiTech University, 99 Haike Road, Pudong, Shanghai 201203, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25822790" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Diphosphate/analogs & derivatives/chemistry/metabolism ; Binding Sites ; Crystallography, X-Ray ; Deoxyadenine Nucleotides/*chemistry/*metabolism/pharmacology ; Humans ; Ligands ; Models, Molecular ; Molecular Conformation ; Purinergic P2Y Receptor Antagonists/*chemistry/metabolism/pharmacology ; Receptors, Purinergic P2Y1/*chemistry/*metabolism ; Thionucleotides/chemistry/metabolism ; Uracil/*analogs & derivatives/chemistry/metabolism/pharmacology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 7
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1980-04-11
    Description: Epimastigotes, the invertebrate host stage of Trypanosoma cruzi, the protozoan parasite causing Chagas' disease in man, were fused with vertebrate cells by using polyethylene glycol. Hybrid cells were selected on the basis of T. cruzi DNA complementation of biochemical deficiencies in the vertebrate cells. Some clones of the hybrid cells expressed T. cruzi-specific antigen. It might be possible to use selected antigens obtained from the hybrids as vaccines for immunodiagnosis or for elucidation of the pathogenesis of Chagas' disease.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Crane, M S -- Dvorak, J A -- New York, N.Y. -- Science. 1980 Apr 11;208(4440):194-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6987737" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Antigens/isolation & purification ; *Cell Fusion ; Cell Line ; Clone Cells ; Hybrid Cells/*immunology ; Hybridization, Genetic ; Mammals ; Polyethylene Glycols ; Trypanosoma cruzi/genetics/*immunology
    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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  • 8
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1981-11-27
    Description: Synchronized HeLa cell populations were exposed to Trypanosoma cruzi or Toxoplasma gondii, obligate intracellular protozoan parasites that cause Chagas' disease and toxoplasmosis, respectively, in humans. The ability of the two parasites to infect HeLa cells increased as the HeLa cells proceeded from the G1 phase to the S phase of their growth cycle and decreased as the cells entered G2-M. Characterization of the S-phase cell surface components responsible for this phenomenon could be beneficial in the development of vaccines against these parasitic diseases.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dvorak, J A -- Crane, M S -- New York, N.Y. -- Science. 1981 Nov 27;214(4524):1034-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7029713" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Cell Cycle ; HeLa Cells/physiology ; Humans ; Kinetics ; Toxoplasma/pathogenicity/*physiology ; Trypanosoma cruzi/pathogenicity/*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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  • 9
    Publication Date: 2018-03-06
    Description: Personality research suggests that individual differences in risk aversion may be explained by links with life-history variation. However, few empirical studies examine whether repeatable differences in risk avoidance behaviour covary with life-history traits among individuals in natural populations, or how these links vary depending on the context and the way risk aversion is measured. We measured two different risk avoidance behaviours (latency to enter the nest and inspection time) in wild great tits ( Parus major ) in two different contexts—response to a novel object and to a predator cue placed at the nest-box during incubation---and related these behaviours to female reproductive success and condition. Females responded equally strongly to both stimuli, and although both behaviours were repeatable, they did not correlate. Latency to enter was negatively related to body condition and the number of offspring fledged. By contrast, inspection time was directly explained by whether incubating females had been flushed from the nest before the trial began. Thus, our inferences on the relationship between risk aversion and fitness depend on how risk aversion was measured. Our results highlight the limitations of drawing conclusions about the relevance of single measures of a personality trait such as risk aversion.
    Keywords: behaviour, ecology, evolution
    Electronic ISSN: 2054-5703
    Topics: Natural Sciences in General
    Published by Royal Society
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  • 10
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    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Publication Date: 2023-07-04
    Description: Natural Resources Canada (NRCan) is developing a national Earthquake Early Warning (EEW) system for Canada. The network will focus on regions with a) an expectation of strong earthquakes, and b) concentrations of population and/or critical infrastructure (CI). These regions include parts of British Columbia, Ontario and Quebec. The system will facilitate mitigation of earthquake impacts, allowing for timely and appropriate response actions by the public, emergency measures organizations, CI operators, and other industrial facilities. However, for the system to be effective, a culture of awareness is necessary to ensure appropriate protective actions are taken when alerts are received. A coordinated public education campaign is underway to help achieve this. NRCan is hosting workshops and other outreach activities with CI operators to ensure they are aware of the benefits of installing systems that automatically translate EEW alerts into protective actions. Simultaneously, NRCan is encouraging equipment providers in Canada to develop such automated systems. In these efforts, NRCan is collaborating with federal and provincial public safety organizations, private and international partners, and Non-Governmental Organizations. This will ensure that EEW messaging is authoritative, consistent and accessible. Social science research by collaborators is underway and will guide the education of vulnerable populations including First Nations peoples, new immigrants, people with low income, and the elderly. By making it possible to take safe actions before the arrival of potentially harmful shaking, the national EEW system will contribute to the reduction of earthquake risk in Canada.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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