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  • 1
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    Refractive index dispersion sensing using an array of photonic crystal resonant reflectors (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-08-13
    Description: Refractive index sensing plays a key role in various environmental and biological sensing applications. Here, a method is presented for measuring the absolute refractive index dispersion of liquids using an array of photonic crystal resonant reflectors of varying periods. It is shown that by covering the array with a sample liquid and measuring the resonance wavelength associated with transverse electric polarized quasi guided modes as a function of period, the refractive index dispersion of the liquid can be accurately obtained using an analytical expression. This method is compact, can perform measurements at arbitrary number of wavelengths, and requires only a minute sample volume. The ability to sense a material's dispersion profile offers an added dimension of information that may be of benefit to optofluidic lab-on-a-chip applications.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 2
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    Greenland Ice Sheet surface melt amplified by snowline migration and bare ice exposure (2019)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2019
    Description: 〈p〉Greenland Ice Sheet mass loss has recently increased because of enhanced surface melt and runoff. Since melt is critically modulated by surface albedo, understanding the processes and feedbacks that alter albedo is a prerequisite for accurately forecasting mass loss. Using satellite imagery, we demonstrate the importance of Greenland’s seasonally fluctuating snowline, which reduces ice sheet albedo and enhances melt by exposing dark bare ice. From 2001 to 2017, this process drove 53% of net shortwave radiation variability in the ablation zone and amplified ice sheet melt five times more than hydrological and biological processes that darken bare ice itself. In a warmer climate, snowline fluctuations will exert an even greater control on melt due to flatter ice sheet topography at higher elevations. Current climate models, however, inaccurately predict snowline elevations during high melt years, portending an unforeseen uncertainty in forecasts of Greenland’s runoff contribution to global sea level rise.〈/p〉
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Wave-vector dependence of magnetic properties of excitons in ZnTe (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-04-19
    Description: Author(s): L. C. Smith, J. J. Davies, D. Wolverson, H. Boukari, H. Mariette, V. P. Kochereshko, and R. T. Phillips The magnetic properties of heavy-hole excitons in wide quantum wells of ZnTe with Zn_{x} Mg_{1-x} Te barriers have been studied with photoluminescence and reflectivity measurements. The exciton magnetic moments (as characterized by the g values) and the diamagnetic shifts of the exciton transitions ... [Phys. Rev. B 83, 155206] Published Mon Apr 18, 2011
    Keywords: Semiconductors I: bulk
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Exchange interactions in Cd_{1−x}Mn_{x}Te wide quantum wells (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-10-25
    Description: Author(s): C. Rice, L. C. Smith, J. J. Davies, D. Wolverson, M. Wiater, G. Karczewski, and T. Wojtowicz The exchange interactions between excitons and manganese ions in wide (80 nm) quantum wells of Cd 1− x Mn x Te ( x ≈0.0015 and x ≈0.00027) have been measured for states with center of mass quantum numbers up to 10. The corresponding translational wave vectors are in the range up to 4×10 6  cm −1 and in this ra... [Phys. Rev. B 86, 155318] Published Wed Oct 24, 2012
    Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 5
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    Molecular analysis of plant migration and refugia in the Arctic (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-08-26
    Description: The arctic flora is thought to have originated during the late Tertiary, approximately 3 million years ago. Plant migration routes during colonization of the Arctic are currently unknown, and uncertainty remains over where arctic plants survived Pleistocene glaciations. A phylogenetic analysis of chloroplast DNA variation in the purple saxifrage (Saxifraga oppositifolia) indicates that this plant first occurred in the Arctic in western Beringia before it migrated east and west to achieve a circumpolar distribution. The geographical distribution of chloroplast DNA variation in the species supports the hypothesis that, during Pleistocene glaciations, some plant refugia were located in the Arctic as well as at more southern latitudes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Abbott, R J -- Smith, L C -- Milne, R I -- Crawford, R M -- Wolff, K -- Balfour, J -- New York, N.Y. -- Science. 2000 Aug 25;289(5483):1343-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Environmental and Evolutionary Biology, Harold Mitchell Building, School of Biology, University of St. Andrews, St. Andrews, Fife KY16 9TH, UK. rja@st-and.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10958779" target="_blank"〉PubMed〈/a〉
    Keywords: Angiosperms/*genetics/*physiology ; Arctic Regions ; Biological Evolution ; DNA Restriction Enzymes ; DNA, Chloroplast/*genetics ; DNA, Plant/*genetics ; Ecosystem ; *Genetic Variation ; *Haplotypes ; Plant Leaves/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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  • 6
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    Rapid early development of circumarctic peatlands and atmospheric CH4 and CO2 variations (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-10-14
    Description: An analysis of 1516 radiocarbon dates demonstrates that the development of the current circumarctic peatlands began approximately 16.5 thousand years ago (ka) and expanded explosively between 12 and 8 ka in concert with high summer insolation and increasing temperatures. Their rapid development contributed to the sustained peak in CH4 and modest decline of CO2 during the early Holocene and likely contributed to CH4 and CO2 fluctuations during earlier interglacial and interstadial transitions. Given the decreased tempo of peatland initiation in the late Holocene and the transition of many from fens (which generated high levels of CH4) to ombrotrophic bogs, a neoglacial expansion of northern peatlands cannot explain the increase in atmospheric CH4 that occurred after 6 ka.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Macdonald, Glen M -- Beilman, David W -- Kremenetski, Konstantine V -- Sheng, Yongwei -- Smith, Laurence C -- Velichko, Andrei A -- New York, N.Y. -- Science. 2006 Oct 13;314(5797):285-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geography, University of California, Los Angeles, CA 90095-1524, USA. macdonal@geog.ucla.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17038618" 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
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    Siberian peatlands a net carbon sink and global methane source since the early Holocene (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-01-17
    Description: Interpolar methane gradient (IPG) data from ice cores suggest the "switching on" of a major Northern Hemisphere methane source in the early Holocene. Extensive data from Russia's West Siberian Lowland show (i) explosive, widespread peatland establishment between 11.5 and 9 thousand years ago, predating comparable development in North America and synchronous with increased atmospheric methane concentrations and IPGs, (ii) larger carbon stocks than previously thought (70.2 Petagrams, up to approximately 26% of all terrestrial carbon accumulated since the Last Glacial Maximum), and (iii) little evidence for catastrophic oxidation, suggesting the region represents a long-term carbon dioxide sink and global methane source since the early Holocene.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Smith, L C -- MacDonald, G M -- Velichko, A A -- Beilman, D W -- Borisova, O K -- Frey, K E -- Kremenetski, K V -- Sheng, Y -- New York, N.Y. -- Science. 2004 Jan 16;303(5656):353-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geography, University of California, Los Angeles, CA 90095-1524, USA. lsmith@geog.ucla.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14726587" 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
    Published by American Association for the Advancement of Science (AAAS)
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  • 8
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    Disappearing Arctic lakes (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-06-04
    Description: Historical archived satellite images were compared with contemporary satellite data to track ongoing changes in more than 10,000 large lakes in rapidly warming Siberia. A widespread decline in lake abundance and area has occurred since 1973, despite slight precipitation increases to the region. The spatial pattern of lake disappearance suggests (i) that thaw and "breaching" of permafrost is driving the observed losses, by enabling rapid lake draining into the subsurface; and (ii) a conceptual model in which high-latitude warming of permafrost triggers an initial but transitory phase of lake and wetland expansion, followed by their widespread disappearance.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Smith, L C -- Sheng, Y -- MacDonald, G M -- Hinzman, L D -- New York, N.Y. -- Science. 2005 Jun 3;308(5727):1429.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geography, 1255 Bunche Hall, University of California-Los Angeles, Los Angeles, CA 90095, USA. lsmith@geog.ucla.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15933192" 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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  • 9
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    An intercomparison of remote sensing river discharge estimation algorithms from measurements of river height, width, and slope (2016)
    Wiley
    Details
    Publication Date: 2016-05-14
    Description: The Surface Water and Ocean Topography (SWOT) satellite mission planned for launch in 2020 will map river elevations and inundated area globally for rivers 〉100 m wide. In advance of this launch, we here evaluated the possibility of estimating discharge in ungauged rivers using synthetic, daily ‘remote sensing' measurements derived from hydraulic models corrupted with minimal observational errors. Five discharge algorithms were evaluated, as well as the median of the five, for nineteen rivers spanning a range of hydraulic and geomorphic conditions. Reliance upon a priori information, and thus applicability to truly ungauged reaches, varied among algorithms: one algorithm employed only global limits on velocity and depth, while the other algorithms relied on globally-available prior estimates of discharge. We found at least one algorithm able to estimate instantaneous discharge to within 35% relative root mean squared error (RRMSE) on 14/16 non-braided rivers despite out-of-bank flows, multi-channel planforms, and backwater effects. Moreover, we found RRMSE was often dominated by bias; the median standard deviation of relative residuals across the 16 non-braided rivers was only 12.5%. SWOT discharge algorithm progress is therefore encouraging, yet future efforts should consider incorporating ancillary data or multi-algorithm synergy to improve results. This article is protected by copyright. All rights reserved.
    Print ISSN: 0043-1397
    Electronic ISSN: 1944-7973
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 10
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    The genome of the sea urchin Strongylocentrotus purpuratus (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-11-11
    Description: We report the sequence and analysis of the 814-megabase genome of the sea urchin Strongylocentrotus purpuratus, a model for developmental and systems biology. The sequencing strategy combined whole-genome shotgun and bacterial artificial chromosome (BAC) sequences. This use of BAC clones, aided by a pooling strategy, overcame difficulties associated with high heterozygosity of the genome. The genome encodes about 23,300 genes, including many previously thought to be vertebrate innovations or known only outside the deuterostomes. This echinoderm genome provides an evolutionary outgroup for the chordates and yields insights into the evolution of deuterostomes.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3159423/" 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/PMC3159423/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sea Urchin Genome Sequencing Consortium -- Sodergren, Erica -- Weinstock, George M -- Davidson, Eric H -- Cameron, R Andrew -- Gibbs, Richard A -- Angerer, Robert C -- Angerer, Lynne M -- Arnone, Maria Ina -- Burgess, David R -- Burke, Robert D -- Coffman, James A -- Dean, Michael -- Elphick, Maurice R -- Ettensohn, Charles A -- Foltz, Kathy R -- Hamdoun, Amro -- Hynes, Richard O -- Klein, William H -- Marzluff, William -- McClay, David R -- Morris, Robert L -- Mushegian, Arcady -- Rast, Jonathan P -- Smith, L Courtney -- Thorndyke, Michael C -- Vacquier, Victor D -- Wessel, Gary M -- Wray, Greg -- Zhang, Lan -- Elsik, Christine G -- Ermolaeva, Olga -- Hlavina, Wratko -- Hofmann, Gretchen -- Kitts, Paul -- Landrum, Melissa J -- Mackey, Aaron J -- Maglott, Donna -- Panopoulou, Georgia -- Poustka, Albert J -- Pruitt, Kim -- Sapojnikov, Victor -- Song, Xingzhi -- Souvorov, Alexandre -- Solovyev, Victor -- Wei, Zheng -- Whittaker, Charles A -- Worley, Kim -- Durbin, K James -- Shen, Yufeng -- Fedrigo, Olivier -- Garfield, David -- Haygood, Ralph -- Primus, Alexander -- Satija, Rahul -- Severson, Tonya -- Gonzalez-Garay, Manuel L -- Jackson, Andrew R -- Milosavljevic, Aleksandar -- Tong, Mark -- Killian, Christopher E -- Livingston, Brian T -- Wilt, Fred H -- Adams, Nikki -- Belle, Robert -- Carbonneau, Seth -- Cheung, Rocky -- Cormier, Patrick -- Cosson, Bertrand -- Croce, Jenifer -- Fernandez-Guerra, Antonio -- Geneviere, Anne-Marie -- Goel, Manisha -- Kelkar, Hemant -- Morales, Julia -- Mulner-Lorillon, Odile -- Robertson, Anthony J -- Goldstone, Jared V -- Cole, Bryan -- Epel, David -- Gold, Bert -- Hahn, Mark E -- Howard-Ashby, Meredith -- Scally, Mark -- Stegeman, John J -- Allgood, Erin L -- Cool, Jonah -- Judkins, Kyle M -- McCafferty, Shawn S -- Musante, Ashlan M -- Obar, Robert A -- Rawson, Amanda P -- Rossetti, Blair J -- Gibbons, Ian R -- Hoffman, Matthew P -- Leone, Andrew -- Istrail, Sorin -- Materna, Stefan C -- Samanta, Manoj P -- Stolc, Viktor -- Tongprasit, Waraporn -- Tu, Qiang -- Bergeron, Karl-Frederik -- Brandhorst, Bruce P -- Whittle, James -- Berney, Kevin -- Bottjer, David J -- Calestani, Cristina -- Peterson, Kevin -- Chow, Elly -- Yuan, Qiu Autumn -- Elhaik, Eran -- Graur, Dan -- Reese, Justin T -- Bosdet, Ian -- Heesun, Shin -- Marra, Marco A -- Schein, Jacqueline -- Anderson, Michele K -- Brockton, Virginia -- Buckley, Katherine M -- Cohen, Avis H -- Fugmann, Sebastian D -- Hibino, Taku -- Loza-Coll, Mariano -- Majeske, Audrey J -- Messier, Cynthia -- Nair, Sham V -- Pancer, Zeev -- Terwilliger, David P -- Agca, Cavit -- Arboleda, Enrique -- Chen, Nansheng -- Churcher, Allison M -- Hallbook, F -- Humphrey, Glen W -- Idris, Mohammed M -- Kiyama, Takae -- Liang, Shuguang -- Mellott, Dan -- Mu, Xiuqian -- Murray, Greg -- Olinski, Robert P -- Raible, Florian -- Rowe, Matthew -- Taylor, John S -- Tessmar-Raible, Kristin -- Wang, D -- Wilson, Karen H -- Yaguchi, Shunsuke -- Gaasterland, Terry -- Galindo, Blanca E -- Gunaratne, Herath J -- Juliano, Celina -- Kinukawa, Masashi -- Moy, Gary W -- Neill, Anna T -- Nomura, Mamoru -- Raisch, Michael -- Reade, Anna -- Roux, Michelle M -- Song, Jia L -- Su, Yi-Hsien -- Townley, Ian K -- Voronina, Ekaterina -- Wong, Julian L -- Amore, Gabriele -- Branno, Margherita -- Brown, Euan R -- Cavalieri, Vincenzo -- Duboc, Veronique -- Duloquin, Louise -- Flytzanis, Constantin -- Gache, Christian -- Lapraz, Francois -- Lepage, Thierry -- Locascio, Annamaria -- Martinez, Pedro -- Matassi, Giorgio -- Matranga, Valeria -- Range, Ryan -- Rizzo, Francesca -- Rottinger, Eric -- Beane, Wendy -- Bradham, Cynthia -- Byrum, Christine -- Glenn, Tom -- Hussain, Sofia -- Manning, Gerard -- Miranda, Esther -- Thomason, Rebecca -- Walton, Katherine -- Wikramanayke, Athula -- Wu, Shu-Yu -- Xu, Ronghui -- Brown, C Titus -- Chen, Lili -- Gray, Rachel F -- Lee, Pei Yun -- Nam, Jongmin -- Oliveri, Paola -- Smith, Joel -- Muzny, Donna -- Bell, Stephanie -- Chacko, Joseph -- Cree, Andrew -- Curry, Stacey -- Davis, Clay -- Dinh, Huyen -- Dugan-Rocha, Shannon -- Fowler, Jerry -- Gill, Rachel -- Hamilton, Cerrissa -- Hernandez, Judith -- Hines, Sandra -- Hume, Jennifer -- Jackson, Laronda -- Jolivet, Angela -- Kovar, Christie -- Lee, Sandra -- Lewis, Lora -- Miner, George -- Morgan, Margaret -- Nazareth, Lynne V -- Okwuonu, Geoffrey -- Parker, David -- Pu, Ling-Ling -- Thorn, Rachel -- Wright, Rita -- 2P42 ESO7381/PHS HHS/ -- 5 U54 HG003273/HG/NHGRI NIH HHS/ -- EY11930/EY/NEI NIH HHS/ -- F32 ESO12794/PHS HHS/ -- F32 HD047136/HD/NICHD NIH HHS/ -- F32 HD047136-02/HD/NICHD NIH HHS/ -- F32 HD047136-03/HD/NICHD NIH HHS/ -- F32-HD47136/HD/NICHD NIH HHS/ -- GM058231/GM/NIGMS NIH HHS/ -- GM070840/GM/NIGMS NIH HHS/ -- GM61005/GM/NIGMS NIH HHS/ -- GM61464/GM/NIGMS NIH HHS/ -- HD-37105/HD/NICHD NIH HHS/ -- HD039948/HD/NICHD NIH HHS/ -- HD14483/HD/NICHD NIH HHS/ -- HD66219/HD/NICHD NIH HHS/ -- P30-CA14051/CA/NCI NIH HHS/ -- R01 ES006272/ES/NIEHS NIH HHS/ -- R01 ES006272-13/ES/NIEHS NIH HHS/ -- R01 GM070840/GM/NIGMS NIH HHS/ -- R01 HD028152/HD/NICHD NIH HHS/ -- R01ES006272/ES/NIEHS NIH HHS/ -- R37-HD12896/HD/NICHD NIH HHS/ -- RR-15044/RR/NCRR NIH HHS/ -- S19916/Biotechnology and Biological Sciences Research Council/United Kingdom -- T32 GM007601/GM/NIGMS NIH HHS/ -- U54 HG003273/HG/NHGRI NIH HHS/ -- New York, N.Y. -- Science. 2006 Nov 10;314(5801):941-52.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17095691" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Calcification, Physiologic ; Cell Adhesion Molecules/genetics/physiology ; Complement Activation/genetics ; Computational Biology ; Embryonic Development/genetics ; Evolution, Molecular ; Gene Expression Regulation, Developmental ; Genes ; *Genome ; Immunity, Innate/genetics ; Immunologic Factors/genetics/physiology ; Male ; Nervous System Physiological Phenomena ; Proteins/genetics/physiology ; *Sequence Analysis, DNA ; Signal Transduction ; Strongylocentrotus purpuratus/embryology/*genetics/immunology/physiology ; Transcription Factors/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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