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  • Articles  (36)
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  • American Association for the Advancement of Science (AAAS)  (36)
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  • Articles  (36)
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  • 2015-2019  (36)
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  • 1
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-07-08
    Description: Separation and purification are critical industrial processes for separating components of chemical mixtures, and these processes account for about half of industrial energy usage (1). Gas mixtures of compounds with very similar physical properties are particularly difficult to separate. On pages 137 and 141 of this issue, Cadiau et al. (2) and Cui et al. (3), respectively, show that microporous materials can be designed to have high adsorption capacity and selectivity for particular hydrocarbons, enabling energy-efficient separation. Author: Jerry Y. S. Lin
    Keywords: Chemistry
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    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-05-27
    Description: Biomass-degrading microorganisms use lytic polysaccharide monooxygenase (LPMO) enzymes to help digest cellulose, chitin, and starch. By cleaving otherwise inaccessible crystalline cellulose chains, these enzymes provide access to hydrolytic enzymes. LPMOs are of interest to biotechnology because efficient depolymerization of cellulose is a major bottleneck for the production of biologically based chemicals and fuels. On page 1098 of this issue, Kracher et al. (1) compare LPMO-reducing substrates in fungi from different taxonomic groups and lifestyles, based on both biochemical and genomic evidence. The results provide insights into reductive activation of LPMO that are important for developing more efficient industrial enzymes for lignocellulose biorefineries. Author: Angel T. Martínez
    Keywords: Chemistry
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  • 3
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-03-25
    Description: Author: Marc S. Lavine
    Keywords: Chemistry
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    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-04-29
    Description: Author: Jake Yeston
    Keywords: Chemistry
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    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-03-18
    Description: Author: Marc S. Lavine
    Keywords: Chemistry
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    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-03-18
    Description: Water plays a central role in scientific disciplines ranging from geology to astronomy to biology. Yet it is an extraordinarily dif cult liquid to understand because of its complex, ever-changing patterns of hydrogen bonds. Studies of small water clusters have provided important insights into the concerted hydrogen-bond motions that can occur in water. These studies are also crucial for developing an accurate potential function for simulating the properties of liquid water and ice (1). On page 1310 of this issue, Richardson et al. (2) provide evidence for a concerted type of motion in which two hydrogen bonds in a water cluster are broken simultaneously (see the figure). The results have implications for many areas of scientific study, including the chemistry of polar solvents, the conformations of proteins, and the dissolution of ions in minerals. Author: David C. Clary
    Keywords: Chemistry
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  • 7
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-03-18
    Description: Author: Jake Yeston
    Keywords: Chemistry
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Geosciences , 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)
    In: Science
    Publication Date: 2016-03-04
    Description: Lower olefins, particularly ethylene (C2H4), propylene (C3H6), and butylene (C4H8), are important intermediates in the manufacture of products such as plastics, solvents, paints, and medicines. They are produced worldwide in amounts exceeding 200 million tons per year (see the photo) (1), mostly from crude oil. More recent approaches use methanol or synthesis gas (syngas; a mixture of carbon monoxide and hydrogen) as feedstocks, but capital investments are high and/or selectivities to lower olefins limited. A bifunctional catalyst reported by Jiao et al. on page 1065 of this issue (2) enables the direct conversion of synthesis gas to lower olefins with a surprisingly high selectivity. Author: Krijn P. de Jong
    Keywords: Chemistry
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  • 9
    Publication Date: 2016-01-20
    Description: Massive open online courses (MOOCs) are often characterized as remedies to educational disparities related to social class. Using data from 68 MOOCs offered by Harvard and MIT between 2012 and 2014, we found that course participants from the United States tended to live in more-affluent and better-educated neighborhoods than the average U.S. resident. Among those who did register for courses, students with greater socioeconomic resources were more likely to earn a certificate. Furthermore, these differences in MOOC access and completion were larger for adolescents and young adults, the traditional ages where people find on-ramps into science, technology, engineering, and mathematics (STEM) coursework and careers. Our findings raise concerns that MOOCs and similar approaches to online learning can exacerbate rather than reduce disparities in educational outcomes related to socioeconomic status.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hansen, John D -- Reich, Justin -- New York, N.Y. -- Science. 2015 Dec 4;350(6265):1245-8. doi: 10.1126/science.aab3782. Epub 2015 Dec 3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Harvard Graduate School of Education, Harvard University, Cambridge, MA 02138, USA. john_hansen@mail.harvard.edu. ; Office of Digital Learning, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26785488" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; Adult ; Career Choice ; Certification/*methods ; Education, Distance/*methods ; Engineering/education ; Humans ; Internet ; Learning ; Mathematics/education ; *Online Systems ; Science/education ; *Social Class ; Students ; Technology/education ; United States ; Young Adult
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
    Publication Date: 2016-02-05
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Claiborne, Anne B -- English, Rebecca A -- Kahn, Jeffrey P -- 10002265/PHS HHS/ -- New York, N.Y. -- Science. 2016 Feb 12;351(6274):668-70. doi: 10.1126/science.aaf3091. Epub 2016 Feb 3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Medicine, U.S. National Academies of Sciences, Engineering, and Medicine, Washington, DC 20001, USA. aclaiborne@nas.edu. ; Institute of Medicine, U.S. National Academies of Sciences, Engineering, and Medicine, Washington, DC 20001, USA. ; Johns Hopkins Berman Institute of Bioethics, Johns Hopkins University, Baltimore, MD 21205, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26842937" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Nucleus/genetics ; DNA, Mitochondrial/genetics ; Ethics, Medical ; *Government Regulation ; Humans ; Mitochondrial Diseases/genetics/*prevention & control ; Mitochondrial Replacement Therapy/*ethics/*standards ; *Oocytes ; United States ; United States Food and Drug Administration ; *Zygote
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  • 11
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2016-01-02
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cohen, Jon -- New York, N.Y. -- Science. 2016 Jan 1;351(6268):16-9. doi: 10.1126/science.351.6268.16.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26721985" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biomedical Research/*economics ; Communicable Disease Control/*economics ; Financial Management ; Humans ; National Institutes of Health (U.S.) ; United States ; Vaccines/*economics
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  • 12
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2016-01-23
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shanahan, Jesse -- New York, N.Y. -- Science. 2016 Jan 22;351(6271):418. doi: 10.1126/science.351.6271.418.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Jesse Shanahan is a master's student in astronomy at Wesleyan University in Middletown, Connecticut. Send your story to SciCareerEditor@aaas.org.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26798017" target="_blank"〉PubMed〈/a〉
    Keywords: Astronomy/*education ; *Career Mobility ; Disabled Persons/*psychology/statistics & numerical data ; Fear ; *Hostility ; Humans ; Male ; United States
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  • 13
    Publication Date: 2016-04-02
    Description: Global climate change is a major threat to biodiversity. Large-scale analyses have generally focused on the impacts of climate change on the geographic ranges of species and on phenology, the timing of ecological phenomena. We used long-term monitoring of the abundance of breeding birds across Europe and the United States to produce, for both regions, composite population indices for two groups of species: those for which climate suitability has been either improving or declining since 1980. The ratio of these composite indices, the climate impact indicator (CII), reflects the divergent fates of species favored or disadvantaged by climate change. The trend in CII is positive and similar in the two regions. On both continents, interspecific and spatial variation in population abundance trends are well predicted by climate suitability trends.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stephens, Philip A -- Mason, Lucy R -- Green, Rhys E -- Gregory, Richard D -- Sauer, John R -- Alison, Jamie -- Aunins, Ainars -- Brotons, Lluis -- Butchart, Stuart H M -- Campedelli, Tommaso -- Chodkiewicz, Tomasz -- Chylarecki, Przemyslaw -- Crowe, Olivia -- Elts, Jaanus -- Escandell, Virginia -- Foppen, Ruud P B -- Heldbjerg, Henning -- Herrando, Sergi -- Husby, Magne -- Jiguet, Frederic -- Lehikoinen, Aleksi -- Lindstrom, Ake -- Noble, David G -- Paquet, Jean-Yves -- Reif, Jiri -- Sattler, Thomas -- Szep, Tibor -- Teufelbauer, Norbert -- Trautmann, Sven -- van Strien, Arco J -- van Turnhout, Chris A M -- Vorisek, Petr -- Willis, Stephen G -- New York, N.Y. -- Science. 2016 Apr 1;352(6281):84-7. doi: 10.1126/science.aac4858.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Conservation Ecology Group, School of Biological and Biomedical Sciences, Durham University, South Road, Durham DH1 3LE, UK. ; Royal Society for the Protection of Birds, Centre for Conservation Science, The Lodge, Sandy, Bedfordshire SG19 2DL, UK. ; Royal Society for the Protection of Birds, Centre for Conservation Science, The Lodge, Sandy, Bedfordshire SG19 2DL, UK. Conservation Science Group, Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, UK. ; United States Geological Survey, Patuxent Wildlife Research Center, 12100 Beech Forest Road, Laurel, MD 20708, USA. ; Institute of Integrative Biology, University of Liverpool, Crown Street, Liverpool L69 3BX, UK. ; Faculty of Biology, University of Latvia, Jelgavas iela 1, Riga, LV-1004, Latvia. ; Center for Mediterranean Forest Research, Centre Tecnologic Forestal de Catalunya, InForest JRU, Solsona 25280, Spain. REAF, Cerdanyola del Valles 08193, Catalonia, Spain. CSIC, Cerdanyola del Valles 08193, Catalonia, Spain. ; Conservation Science Group, Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, UK. BirdLife International, The David Attenborough Building, Pembroke Street, Cambridge CB2 3QZ, UK. ; MITO2000 National Committee; c/o Dream Italia, Via Garibaldi 3, 52015, Pratovecchio-Stia, Arezzo, Italy. ; Ogolnopolskie Towarzystwo Ochrony Ptakow, Odrowaza 24,05-270 Marki, Poland. ; Museum and Institute of Zoology, Polish Academy of Sciences, Wilcza 64, 00-679 Warszawa, Poland. ; BirdWatch Ireland, Unit 20 Block D Bullford Business Campus, Kilcoole, County Wicklow, Ireland. ; Institute of Ecology and Earth Sciences, University of Tartu, Vanemuise Street 46, 51014 Tartu, Estonia. Estonian Ornithological Society, Veski 4, 51005 Tartu, Estonia. ; Sociedad Espanola de Ornitologia/BirdLife Melquiades Biencinto, 34, 28053 Madrid. Spain. ; European Bird Census Council, Post Office Box 6521, 6503 GA Nijmegen, Netherlands. Sovon Dutch Centre for Field Ornithology, Post Office Box 6521, 6503 GA Nijmegen, Netherlands. Department of Animal Ecology and Ecophysiology, Institute for Water and Wetland Research, Radboud University, Post Office Box 9010, 6500 GL Nijmegen, Netherlands. ; Dansk Ornitologisk Forening-BirdLife Denmark and University of Aarhus, Vesterbrogade 140, 1620 Kobenhavn V, Denmark. ; European Bird Census Council-Catalan Ornithological Institute, Natural History Museum of Barcelona, Placa Leonardo da Vinci 4-5, 08019 Barcelona, Catalonia, Spain. ; Section for Science, Nord University, 7600 Levanger, Norway. ; UMR7204 Sorbonne Universites-MNHN-CNRS-UPMC, CESCO, CRBPO, CP 135, 43 Rue Buffon, 75005 Paris, France. ; The Helsinki Lab of Ornithology, Finnish Museum of Natural History, Post Office Box 17, 00014 University of Helsinki, Finland. ; Biodiversity Unit, Department of Biology, Lund University, Ecology Building, S-223 62 Lund, Sweden. ; The British Trust for Ornithology, The Nunnery, Thetford, Norfolk IP24 2PU, UK. ; Natagora, Departement Etudes, Rue Nanon 98, B-5000 Namur, Belgium. ; Institute for Environmental Studies, Faculty of Science, Charles University in Prague, Czech Republic. Department of Zoology and Laboratory of Ornithology, Faculty of Science, Palacky University Olomouc, 17 Listopadu 50, 771 43 Olomouc, Czech Republic. ; Swiss Ornithological Institute, Seerose 1, 6204 Sempach, Switzerland. ; Institute of Environmental Sciences, University of Nyiregyhaza, Sostoi ut 31/b, 4400 Nyiregyhaza, Hungary. ; BirdLife Austria, Museumsplatz 1/10/8, A-1070 Vienna, Austria. ; Dachverband Deutscher Avifaunisten e.V. (Federation of German Avifaunists), An den Speichern 6, D-48157 Munster, Germany. ; Statistics Netherlands, Post Office Box 24500, 2490 HA The Hague, Netherlands. ; Sovon Dutch Centre for Field Ornithology, Post Office Box 6521, 6503 GA Nijmegen, Netherlands. Department of Animal Ecology and Ecophysiology, Institute for Water and Wetland Research, Radboud University, Post Office Box 9010, 6500 GL Nijmegen, Netherlands. ; Department of Zoology and Laboratory of Ornithology, Faculty of Science, Palacky University Olomouc, 17 Listopadu 50, 771 43 Olomouc, Czech Republic. Pan-European Common Bird Monitoring Scheme, Czech Society for Ornithology, Na Belidle 252/34, CZ-15000 Prague 5, Czech Republic.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27034371" target="_blank"〉PubMed〈/a〉
    Keywords: Animal Migration ; Animals ; Biodiversity ; *Birds ; Breeding ; *Climate Change ; Ecological Parameter Monitoring ; Europe ; Population Dynamics ; United States
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  • 14
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2016-03-12
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stone, Richard -- New York, N.Y. -- Science. 2016 Mar 11;351(6278):1138-40. doi: 10.1126/science.351.6278.1138.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26965605" target="_blank"〉PubMed〈/a〉
    Keywords: Computer Simulation ; *Explosions ; *Forensic Sciences ; Humans ; *Nuclear Weapons ; United States
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  • 15
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2016-02-26
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉McNutt, Marcia -- New York, N.Y. -- Science. 2016 Feb 12;351(6274):641. doi: 10.1126/science.aaf4014. Epub 2016 Feb 11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Marcia McNutt Editor-in-Chief Science Journals.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26912832" target="_blank"〉PubMed〈/a〉
    Keywords: Corrosion ; Federal Government ; Humans ; Michigan ; *Public Health ; Safety/*economics ; Trust ; United States ; United States Environmental Protection Agency ; Water Supply/*economics
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  • 16
    Publication Date: 2016-02-26
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fahlgren, Noah -- Bart, Rebecca -- Herrera-Estrella, Luis -- Rellan-Alvarez, Ruben -- Chitwood, Daniel H -- Dinneny, Jose R -- New York, N.Y. -- Science. 2016 Feb 19;351(6275):824. doi: 10.1126/science.351.6275.824-a. Epub 2016 Feb 18.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Donald Danforth Plant Science Center, St. Louis, MO 63132, USA. ; Nacional de Genomica para la Biodiversidad, Irapuato, 36821, Mexico. ; Donald Danforth Plant Science Center, St. Louis, MO 63132, USA. jdinneny@carnegiescience.edu dchitwood@danforthcenter.org. ; Carnegie Institution for Science, Stanford, CA 94305, USA. jdinneny@carnegiescience.edu dchitwood@danforthcenter.org.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26912883" target="_blank"〉PubMed〈/a〉
    Keywords: China ; Food, Genetically Modified/*adverse effects ; Genetic Engineering/*utilization ; Health ; Humans ; Plants, Genetically Modified/*adverse effects/genetics ; United States ; Zea mays/genetics
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  • 17
    Publication Date: 2016-01-09
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mervis, Jeffrey -- New York, N.Y. -- Science. 2016 Jan 8;351(6269):115. doi: 10.1126/science.351.6269.115.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26744390" target="_blank"〉PubMed〈/a〉
    Keywords: Female ; Financing, Organized/*statistics & numerical data ; Humans ; Research Personnel ; Research Support as Topic/*statistics & numerical data ; *Sexism ; United States ; *Women, Working
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  • 18
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2016-01-02
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mervis, Jeffrey -- New York, N.Y. -- Science. 2016 Jan 1;351(6268):10-1. doi: 10.1126/science.351.6268.10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉With reporting from Science's news staff.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26721980" target="_blank"〉PubMed〈/a〉
    Keywords: Biomedical Research/*economics ; Budgets ; Humans ; National Institutes of Health (U.S.)/*economics ; *Research Support as Topic ; United States ; United States National Aeronautics and Space Administration/economics
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  • 19
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2016-04-16
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Underwood, Emily -- New York, N.Y. -- Science. 2016 Apr 15;352(6283):277-8. doi: 10.1126/science.352.6283.277.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27081045" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Brain ; *Datasets as Topic ; European Union ; Humans ; International Cooperation ; Neurosciences/*trends ; United States
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  • 20
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2016-04-29
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Varmus, Harold -- New York, N.Y. -- Science. 2016 Apr 8;352(6282):123. doi: 10.1126/science.aaf7301.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Harold Varmus is the Lewis Thomas University Professor at the Meyer Cancer Center, Weill Cornell Medicine, New York, NY; Senior Associate Member of the New York Genome Center, New York, NY; and former director of the U.S. National Cancer Institute. varmus@med.cornell.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27124426" target="_blank"〉PubMed〈/a〉
    Keywords: Federal Government ; Humans ; Information Dissemination ; *Leadership ; Medical Oncology/economics/*trends ; Neoplasms/diagnosis/drug therapy/prevention & control ; United States
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  • 21
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2016-04-23
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fu, He -- New York, N.Y. -- Science. 2016 Apr 22;352(6284):486. doi: 10.1126/science.352.6284.486.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉He Fu is a Ph.D. candidate in the Department of Microbiology at the University of Illinois, Urbana-Champaign. For more on life and careers, visit sciencecareers.org. Send your story to SciCareerEditor@aaas.org.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27102487" target="_blank"〉PubMed〈/a〉
    Keywords: *Career Choice ; China ; *International Educational Exchange ; Microbiology/*education ; United States
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2016-01-28
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Alberts, Bruce -- New York, N.Y. -- Science. 2016 Jan 15;351(6270):207. doi: 10.1126/science.aaf2001.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Bruce Alberts is the Chancellor's Leadership Chair in Biochemistry and Biophysics for Science and Education at the University of California, San Francisco, CA, and emeritus editor-in-chief of Science. Bruce.Alberts@ucsf.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26816352" target="_blank"〉PubMed〈/a〉
    Keywords: *Career Choice ; *Faculty ; Humans ; Leadership ; Policy Making ; *Power (Psychology) ; Schools/*manpower/trends ; Teaching/*manpower/methods/trends ; United States
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2016-04-23
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pennisi, Elizabeth -- New York, N.Y. -- Science. 2016 Apr 22;352(6284):394-5. doi: 10.1126/science.352.6284.394. Epub 2016 Apr 21.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27102455" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Evolution, Molecular ; Foundations ; Genes ; Genetic Research/*economics ; Great Britain ; Humans ; *Research Support as Topic ; *Selection, Genetic ; Sweden ; United States
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2016-03-12
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Blum, Arlene -- New York, N.Y. -- Science. 2016 Mar 11;351(6278):1117. doi: 10.1126/science.aaf5468. Epub 2016 Mar 10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Arlene Blum is founder and executive director of the Green Science Policy Institute, Berkeley, CA. arlene@GreenSciencePolicy.org.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26965592" target="_blank"〉PubMed〈/a〉
    Keywords: Consumer Product Safety/*legislation & jurisprudence ; Health ; Household Products/*toxicity ; Humans ; Manufactured Materials/*toxicity ; United States
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2016-01-02
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kaiser, Jocelyn -- New York, N.Y. -- Science. 2016 Jan 1;351(6268):14. doi: 10.1126/science.351.6268.14.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26721983" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Databases, Genetic/*economics ; Financial Support ; Human Genome Project/*economics ; Humans ; Models, Animal ; National Human Genome Research Institute (U.S.)/*economics ; United States
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2016-01-30
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Richmond, Geraldine -- New York, N.Y. -- Science. 2016 Jan 29;351(6272):427. doi: 10.1126/science.aaf2869. Epub 2016 Jan 28.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Geraldine Richmond is president of AAAS and Presidential Chair in Science and professor in the Department of Chemistry and Biochemistry at the University of Oregon, Eugene, OR. richmond@oregon.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26823402" target="_blank"〉PubMed〈/a〉
    Keywords: Africa ; Asia ; *Food Supply ; Humans ; *Internationality ; United States ; *Water Supply
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2016-04-02
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kaiser, Jocelyn -- New York, N.Y. -- Science. 2016 Apr 1;352(6281):20. doi: 10.1126/science.352.6281.20.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27034352" target="_blank"〉PubMed〈/a〉
    Keywords: Awards and Prizes ; Biomedical Research/*economics ; *Financing, Government ; National Institute of General Medical Sciences (U.S.) ; United States
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Publication Date: 2016-01-23
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kaiser, Jocelyn -- Couzin-Frankel, Jennifer -- New York, N.Y. -- Science. 2016 Jan 22;351(6271):325-6. doi: 10.1126/science.351.6271.325.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26797992" target="_blank"〉PubMed〈/a〉
    Keywords: Biomedical Research/*organization & administration ; Federal Government ; Humans ; Neoplasms/*therapy ; Policy ; United States
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2016-03-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Roman, Joe -- Kraska, James -- New York, N.Y. -- Science. 2016 Mar 18;351(6279):1258-60. doi: 10.1126/science.aad4247.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Gund Institute for Ecological Economics, University of Vermont, Burlington, VT 05405, USA. jroman@uvm.edu. ; Stockton Center for the Study of International Law, U.S. Naval War College, Newport, RI 02841, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26989232" target="_blank"〉PubMed〈/a〉
    Keywords: *Bays ; *Conservation of Natural Resources ; Cuba ; Diplomacy ; United States
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    Publication Date: 2016-09-02
    Description: Effective differentiation of prochiral carbon–hydrogen (C–H) bonds on a single methylene carbon via asymmetric metal insertion remains a challenge. Here, we report the discovery of chiral acetyl-protected aminoethyl quinoline ligands that enable asymmetric palladium insertion into prochiral C–H bonds on a single methylene carbon center. We apply these palladium complexes to catalytic enantioselective functionalization of β-methylene C–H bonds in aliphatic amides. Using bidentate ligands to accelerate C–H activation of otherwise unreactive monodentate substrates is crucial for outcompeting the background reaction driven by substrate-directed cyclopalladation, thereby avoiding erosion of enantioselectivity. The potential of ligand acceleration in C–H activation is also demonstrated by enantioselective β-C–H arylation of simple carboxylic acids without installing directing groups.
    Keywords: Chemistry
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-11-04
    Description: Author: Jake Yeston
    Keywords: Chemistry
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-11-25
    Description: Author: Jake Yeston
    Keywords: Chemistry
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    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-11-11
    Description: Although ammonia (NH3) is made on a vast scale for use in fertilizers, its use as a chemical feedstock or as an energy carrier is much more limited. Many reactions that occur easily with its substitution products (amines) are sluggish for NH3, in part because of the difficulty of activating the N-H bond. For fuel cells, NH3 is attractive because it does not generate greenhouse gases, as do methanol and methane (1), and is more easily stored than hydrogen (H2). Amine-containing organic molecules are used in pharmaceutical and materials applications, and accessing these structures directly from ammonia could limit the generation of by-products during their synthesis (2). Bringing NH3 up to speed for these applications will require both the development of catalysts that can activate the strong N–H bond of ammonia and a fundamental understanding of the N–H bond cleavage step. On page 730 of this issue, Bezdek et al. (3) report a molybdenum complex capable of weakening the N–H bond of NH3 and releasing a H atom to generate H2 under mild conditions. Author: Jessica Hoover
    Keywords: Chemistry
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    Publication Date: 2016-09-02
    Description: Direct methods for stereoselective functionalization of sp 3 -hybridized carbon–hydrogen [C(sp 3 )–H] bonds in complex organic molecules could facilitate much more efficient preparation of therapeutics and agrochemicals. Here, we report a copper-catalyzed radical relay pathway for enantioselective conversion of benzylic C–H bonds into benzylic nitriles. Hydrogen-atom abstraction affords an achiral benzylic radical that undergoes asymmetric C(sp 3 )–CN bond formation upon reaction with a chiral copper catalyst. The reactions proceed efficiently at room temperature with the benzylic substrate as limiting reagent, exhibit broad substrate scope with high enantioselectivity (typically 90 to 99% enantiomeric excess), and afford products that are key precursors to important bioactive molecules. Mechanistic studies provide evidence for diffusible organic radicals and highlight the difference between these reactions and C–H oxidations mediated by enzymes and other catalysts that operate via radical rebound pathways.
    Keywords: Chemistry
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    Publication Date: 2016-09-02
    Description: Oxygen electrochemistry plays a key role in renewable energy technologies such as fuel cells and electrolyzers, but the slow kinetics of the oxygen evolution reaction (OER) limit the performance and commercialization of such devices. Here we report an iridium oxide/strontium iridium oxide (IrO x /SrIrO 3 ) catalyst formed during electrochemical testing by strontium leaching from surface layers of thin films of SrIrO 3 . This catalyst has demonstrated specific activity at 10 milliamps per square centimeter of oxide catalyst (OER current normalized to catalyst surface area), with only 270 to 290 millivolts of overpotential for 30 hours of continuous testing in acidic electrolyte. Density functional theory calculations suggest the formation of highly active surface layers during strontium leaching with IrO 3 or anatase IrO 2 motifs. The IrO x /SrIrO 3 catalyst outperforms known IrO x and ruthenium oxide (RuO x ) systems, the only other OER catalysts that have reasonable activity in acidic electrolyte.
    Keywords: Chemistry
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    American Association for the Advancement of Science (AAAS)
    In: Science
    Publication Date: 2016-12-09
    Description: Author: Jake Yeston
    Keywords: Chemistry
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    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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