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  • 1
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    Was the nineteenth century giant eruption of Eta Carinae a merger event in a triple system? (2016)
    Oxford University Press
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    Publication Date: 2016-01-13
    Description: We discuss the events that led to the giant eruption of Eta Carinae, and find that the mid-nineteenth century (in 1838–1843) giant mass-loss outburst has the characteristics of being produced by the merger event of a massive close binary, triggered by the gravitational interaction with a massive third companion star, which is the current binary companion in the Eta Carinae system. We come to this conclusion by a combination of theoretical arguments supported by computer simulations using the Astrophysical Multipurpose Software Environment. According to this model the ~90 M  present primary star of the highly eccentric Eta Carinae binary system is the product of this merger, and its ~30 M  companion originally was the third star in the system. In our model, the Homunculus nebula was produced by an extremely enhanced stellar wind, energized by tidal energy dissipation prior to the merger, which enormously boosted the radiation-driven wind mass-loss. The current orbital plane is then aligned with the equatorial plane of the Homunculus, and the symmetric lobes are roughly aligned with the argument of periastron of the current Eta Carina binary. The merger itself then occurred in 1838, which resulted in a massive asymmetric outflow in the equatorial plane of the Homunculus. The 1843 outburst can in our model be attributed to the subsequent encounter when the companion star (once the outermost star in the triple system) plunges through the bloated envelope of the merger product, once when it passed periastron again. We predict that the system has an excess space velocity of order 50 km s –1 in the equatorial plane of the Homunculus. Our triple model gives a viable explanation for the high runaway velocities typically observed in LBVs.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 2
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    Identification of critical staphylococcal genes using conditional phenotypes generated by antisense RNA (2001)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2001-09-22
    Description: Comprehensive genomic analysis of the important human pathogen Staphylococcus aureus was achieved by a strategy involving antisense technology in a regulatable gene expression system. In addition to known essential genes, many genes of unknown or poorly defined biological function were identified. This methodology allowed gene function to be characterized in a comprehensive, defined set of conditionally growth-defective/lethal isogenic strains. Quantitative titration of the conditional growth effect was performed either in bacterial culture or in an animal model of infection. This genomic strategy offers an approach to the identification of staphylococcal gene products that could serve as targets for antibiotic discovery.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ji, Y -- Zhang, B -- Van, S F -- Horn -- Warren, P -- Woodnutt, G -- Burnham, M K -- Rosenberg, M -- New York, N.Y. -- Science. 2001 Sep 21;293(5538):2266-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology, Genetics Research, GlaxoSmithKline Pharmaceuticals Research and Development, Collegeville, PA 19426, USA. yinduo_ji-1@gsk.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11567142" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cloning, Molecular ; Female ; *Gene Expression Regulation, Bacterial ; *Genes, Bacterial ; *Genes, Essential ; Genetic Vectors ; Mice ; Open Reading Frames ; Phenotype ; Pyelonephritis/microbiology ; *RNA, Antisense ; Staphylococcal Infections/microbiology ; Staphylococcus aureus/*genetics/growth & development/pathogenicity ; Transformation, Bacterial ; Virulence/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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  • 3
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    AdhAQP1 for radiation-induced xerostomia [Medical Sciences] (2012)
    National Academy of Sciences
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    Publication Date: 2012-11-21
    Description: No conventional therapy exists for salivary hypofunction in surviving head and neck cancer patients with Radiation Therapy Oncology Group late grade 2–3 toxicity. We conducted a phase I clinical trial to test the safety and biologic efficacy of serotype 5, adenoviral-mediated aquaporin-1 cDNA transfer to a single previously irradiated parotid...
    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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    The Zel'dovich approximation: key to understanding cosmic web complexity (2013)
    Oxford University Press
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    Publication Date: 2013-12-27
    Description: We describe how the dynamics of cosmic structure formation defines the intricate geometric structure of the spine of the cosmic web. The Zel'dovich approximation is used to model the backbone of the cosmic web in terms of its singularity structure. The description by Arnold et al. in terms of catastrophe theory forms the basis of our analysis. This two-dimensional analysis involves a profound assessment of the Lagrangian and Eulerian projections of the gravitationally evolving four-dimensional phase-space manifold. It involves the identification of the complete family of singularity classes, and the corresponding caustics that we see emerging as structure in Eulerian space evolves. In particular, as it is instrumental in outlining the spatial network of the cosmic web, we investigate the nature of spatial connections between these singularities. The major finding of our study is that all singularities are located on a set of lines in Lagrangian space. All dynamical processes related to the caustics are concentrated near these lines. We demonstrate and discuss extensively how all 2D singularities are to be found on these lines. When mapping this spatial pattern of lines to Eulerian space, we find a growing connectedness between initially disjoint lines, resulting in a percolating network. In other words, the lines form the blueprint for the global geometric evolution of the cosmic web.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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