68,459 research outputs found
Evidence for the decay B0→J/ψω and measurement of the relative branching fractions of meson decays to J/ψη and J/ψη′
Full text linkFirst evidence of the B 0 → J / ψ ω decay is found and the B s 0 → J / ψ η and B s 0 → J / ψ η ′ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 fb -1 collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV. The branching fractions of these decays are measured relative to that of the B 0 → J / ψ ρ 0 decay:frac(B (B 0 → J / ψ ω), B (B 0 → J / ψ ρ 0)) = 0.89 ± 0.19 (stat) - 0.13 + 0.07 (syst),frac(B (B s 0 → J / ψ η), B (B 0 → J / ψ ρ 0)) = 14.0 ± 1.2 (stat) - 1.5 + 1.1 (syst) - 1.0 + 1.1 (frac(f d, f s)),frac(B (B s 0 → J / ψ η ′), B (B 0 → J / ψ ρ 0)) = 12.7 ± 1.1 (stat) - 1.3 + 0.5 (syst) - 0.9 + 1.0 (frac(f d, f s)), where the last uncertainty is due to the knowledge of f d / f s, the ratio of b-quark hadronization factors that accounts for the different production rate of B 0 and B s 0 mesons. The ratio of the branching fractions of B s 0 → J / ψ η ′ and B s 0 → J / ψ η decays is measured to befrac(B (B s 0 → J / ψ η ′), B (B s 0 → J / ψ η)) = 0.90 ± 0.09 (stat) - 0.02 + 0.06 (syst)
Letter from Carl Hayden to M. J. Riordan
No full textLetter from Carl Hayden to M. J. Riordan expressing his support for Coconino County in turning over the Bright Angel Trail to the federal government
Letter from M. J. Riordan, Arizona Lumber and Timber Company, to Carl Hayden
No full textLetter from M. J. Riordan to Carl Hayden expressing his opposition to the federal government's takeover of Bright Angel Trail
Repeated high doses of avermectins cause prolonged sterilisation, but do not kill, Onchocerca ochengi adult worms in African cattle
No full textIvermectin (Mectizan, Merck and CO. Inc.) is being widely used in the control of human onchocerciasis (Onchoverca volvulus) because of its potent effect on microfilariae. Human studies have suggested that, at the standard dose of 150 microg/kg an annual treatment schedule of ivermectin reversibly interferes with female worm fertility but is not macrofilaricidal. Because of the importance of determining whether ivermectin could be macrofilaricidal, the efficacy of high and prolonged doses of ivermectin and a related avermectin, doramectin, were investigated in cattle infected with O. ochengi
Measurement of the time-dependent CP asymmetry in B0 -> J/ψ KS0 decays
Full text linkThis Letter reports a measurement of the CP violation observables SJ/ψK0S and CJ/ψK0S in the decay channel B0→J/ψK0S performed with 1.0 fb−1 of pp collisions at s√=7 TeV collected by the LHCb experiment. The fit to the data yields SJ/ψK0S=0.73±0.07(stat)±0.04(syst) and CJ/ψK0S=0.03±0.09(stat)±0.01(syst). Both values are consistent with the current world averages and within
expectations from the Standard Model
From MOFs to zeolites: zirconium for epoxide rearrangement
No full text[EN] Zirconium Lewis acid sites grafted onto a mesoporous silicate (MCM-41) and zirconium sites incorporated into inorganic-organic MOF materials are employed successfully in the rearrangement of beta-pinene epoxide into myrtanal, which is a relevant compound for the fragrance industry. The materials are characterized and the strength of the active sites is evaluated by in situ IR spectroscopy with cyclohexanone as a probe molecule. It is shown that besides isolated zirconium sites, zirconium-oxygen-zirconium species might also be active species for the rearrangement.We thank MINECO (Consolider Ingenio 2010-MULTICAT and CTQ2011-27550) for funding. L.M.O. is grateful to the COLCIENCIAS institute for a Francisco-Jose-de-Caldas (512/2010) doctoral fellowship.Corma Canós, A.; Orozco Arboleda, LM.; Renz, M. (2013). From MOFs to zeolites: zirconium for epoxide rearrangement. New Journal of Chemistry. 37(11):3496-3502. https://doi.org/10.1039/c3nj00551hS349635023711Thomas, J. M. (2012). The societal significance of catalysis and the growing practical importance of single-site heterogeneous catalysts. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 468(2143), 1884-1903. doi:10.1098/rspa.2012.0196Thomas, J. M., & Raja, R. (2010). Mono-, Bi- and Multifunctional Single-Sites: Exploring the Interface Between Heterogeneous and Homogeneous Catalysis. Topics in Catalysis, 53(13-14), 848-858. doi:10.1007/s11244-010-9517-5Shylesh, S., Jia, M., & Thiel, W. R. (2010). Recent Progress in the Heterogenization of Complexes for Single-Site Epoxidation Catalysis. European Journal of Inorganic Chemistry, 2010(28), 4395-4410. doi:10.1002/ejic.201000582Zhu, Y., Chuah, G., & Jaenicke, S. (2003). Al-free Zr-zeolite beta as a regioselective catalyst in the Meerwein–Ponndorf–Verley reaction. Chem. Commun., (21), 2734-2735. doi:10.1039/b309191kCorma, A., & Renz, M. (2007). A General Method for the Preparation of Ethers Using Water-Resistant Solid Lewis Acids. Angewandte Chemie International Edition, 46(1-2), 298-300. doi:10.1002/anie.200604018Corma, A., Nemeth, L. T., Renz, M., & Valencia, S. (2001). Sn-zeolite beta as a heterogeneous chemoselective catalyst for Baeyer–Villiger oxidations. Nature, 412(6845), 423-425. doi:10.1038/35086546Moliner, M., Roman-Leshkov, Y., & Davis, M. E. (2010). Tin-containing zeolites are highly active catalysts for the isomerization of glucose in water. Proceedings of the National Academy of Sciences, 107(14), 6164-6168. doi:10.1073/pnas.1002358107Corma, A., & García, H. (2002). Lewis Acids as Catalysts in Oxidation Reactions: From Homogeneous to Heterogeneous Systems. Chemical Reviews, 102(10), 3837-3892. doi:10.1021/cr010333uCorma, A., Domine, M. E., Nemeth, L., & Valencia, S. (2002). Al-Free Sn-Beta Zeolite as a Catalyst for the Selective Reduction of Carbonyl Compounds (Meerwein−Ponndorf−Verley Reaction). Journal of the American Chemical Society, 124(13), 3194-3195. doi:10.1021/ja012297mCorma, A. (2003). Water-resistant solid Lewis acid catalysts: Meerwein–Ponndorf–Verley and Oppenauer reactions catalyzed by tin-beta zeolite. Journal of Catalysis, 215(2), 294-304. doi:10.1016/s0021-9517(03)00014-9Boronat, M., Corma, A., & Renz, M. (2006). Mechanism of the Meerwein−Ponndorf−Verley−Oppenauer (MPVO) Redox Equilibrium on Sn− and Zr−Beta Zeolite Catalysts. The Journal of Physical Chemistry B, 110(42), 21168-21174. doi:10.1021/jp063249xRenz, M., Blasco, T., Corma, A., Fornés, V., Jensen, R., & Nemeth, L. (2002). Selective and Shape-Selective Baeyer–Villiger Oxidations of Aromatic Aldehydes and Cyclic Ketones with Sn-Beta Zeolites and H2O2. Chemistry - A European Journal, 8(20), 4708-4717. doi:10.1002/1521-3765(20021018)8:203.0.co;2-uBoronat, M., Corma, A., Renz, M., Sastre, G., & Viruela, P. M. (2005). A Multisite Molecular Mechanism for Baeyer-Villiger Oxidations on Solid Catalysts Using Environmentally Friendly H2O2 as Oxidant. Chemistry - A European Journal, 11(23), 6905-6915. doi:10.1002/chem.200500184Román-Leshkov, Y., Moliner, M., Labinger, J. A., & Davis, M. E. (2010). Mechanism of Glucose Isomerization Using a Solid Lewis Acid Catalyst in Water. Angewandte Chemie International Edition, 49(47), 8954-8957. doi:10.1002/anie.201004689Nikolla, E., Román-Leshkov, Y., Moliner, M., & Davis, M. E. (2011). «One-Pot» Synthesis of 5-(Hydroxymethyl)furfural from Carbohydrates using Tin-Beta Zeolite. ACS Catalysis, 1(4), 408-410. doi:10.1021/cs2000544Camblor, M. A., Corma, A., Martínez, A., & Pérez-Pariente, J. (1992). Synthesis of a titaniumsilicoaluminate isomorphous to zeolite beta and its application as a catalyst for the selective oxidation of large organic molecules. J. Chem. Soc., Chem. Commun., 0(8), 589-590. doi:10.1039/c39920000589Blasco, T., Camblor, M. A., Corma, A., Esteve, P., Guil, J. M., Martínez, A., … Valencia, S. (1998). Direct Synthesis and Characterization of Hydrophobic Aluminum-Free Ti−Beta Zeolite. The Journal of Physical Chemistry B, 102(1), 75-88. doi:10.1021/jp973288wSasidharan, M., Wu, P., & Tatsumi, T. (2002). Epoxidation of α,β-Unsaturated Carbonyl Compounds over Various Titanosilicates. Journal of Catalysis, 205(2), 332-338. doi:10.1006/jcat.2001.3440Blasco, T., Corma, A., Navarro, M. T., & Pariente, J. P. (1995). Synthesis, Characterization, and Catalytic Activity of Ti-MCM-41 Structures. Journal of Catalysis, 156(1), 65-74. doi:10.1006/jcat.1995.1232Maschmeyer, T., Rey, F., Sankar, G., & Thomas, J. M. (1995). Heterogeneous catalysts obtained by grafting metallocene complexes onto mesoporous silica. Nature, 378(6553), 159-162. doi:10.1038/378159a0Corma, A., Navarro, M. T., Nemeth, L., & Renz, M. (2001). Sn-MCM-41—a heterogeneous selective catalyst for the Baeyer–Villiger oxidation with hydrogen peroxideElectronic supplementary information (ESI) available: XRD pattern of as-prepared Sn-MCM-41. See http://www.rsc.org/suppdata/cc/b1/b105927k/. Chemical Communications, (21), 2190-2191. doi:10.1039/b105927kLiu, S. H., Jaenicke, S., & Chuah, G. K. (2002). Hydrous Zirconia as a Selective Catalyst for the Meerwein–Ponndorf–Verley Reduction of Cinnamaldehyde. Journal of Catalysis, 206(2), 321-330. doi:10.1006/jcat.2001.3480De la Torre, O., Renz, M., & Corma, A. (2010). Biomass to chemicals: Rearrangement of β-pinene epoxide into myrtanal with well-defined single-site substituted molecular sieves as reusable solid Lewis-acid catalysts. Applied Catalysis A: General, 380(1-2), 165-171. doi:10.1016/j.apcata.2010.03.056Corma, A., García, H., & Llabrés i Xamena, F. X. (2010). Engineering Metal Organic Frameworks for Heterogeneous Catalysis. Chemical Reviews, 110(8), 4606-4655. doi:10.1021/cr9003924Park, K. S., Ni, Z., Cote, A. P., Choi, J. Y., Huang, R., Uribe-Romo, F. J., … Yaghi, O. M. (2006). Exceptional chemical and thermal stability of zeolitic imidazolate frameworks. Proceedings of the National Academy of Sciences, 103(27), 10186-10191. doi:10.1073/pnas.0602439103Cavka, J. H., Jakobsen, S., Olsbye, U., Guillou, N., Lamberti, C., Bordiga, S., & Lillerud, K. P. (2008). A New Zirconium Inorganic Building Brick Forming Metal Organic Frameworks with Exceptional Stability. Journal of the American Chemical Society, 130(42), 13850-13851. doi:10.1021/ja8057953Vermoortele, F., Ameloot, R., Vimont, A., Serre, C., & De Vos, D. (2011). An amino-modified Zr-terephthalate metal–organic framework as an acid–base catalyst for cross-aldol condensation. Chem. Commun., 47(5), 1521-1523. doi:10.1039/c0cc03038dVermoortele, F., Vandichel, M., Van de Voorde, B., Ameloot, R., Waroquier, M., Van Speybroeck, V., & De Vos, D. E. (2012). Electronic Effects of Linker Substitution on Lewis Acid Catalysis with Metal-Organic Frameworks. Angewandte Chemie International Edition, 51(20), 4887-4890. doi:10.1002/anie.201108565Corma, A., Renz, M., & Susarte, M. (2009). Transformation of Biomass Products into Fine Chemicals Catalyzed by Solid Lewis- and Brønsted-acids. Topics in Catalysis, 52(9), 1182-1189. doi:10.1007/s11244-009-9266-5Puchberger, M., Kogler, F. R., Jupa, M., Gross, S., Fric, H., Kickelbick, G., & Schubert, U. (2006). Can the Clusters Zr6O4(OH)4(OOCR)12 and [Zr6O4(OH)4(OOCR)12]2 Be Converted into Each Other? European Journal of Inorganic Chemistry, 2006(16), 3283-3293. doi:10.1002/ejic.200600348Kogler, F. R., Jupa, M., Puchberger, M., & Schubert, U. (2004). Control of the ratio of functional and non-functional ligands in clusters of the type Zr6O4(OH)4(carboxylate)12for their use as building blocks for inorganic–organic hybrid polymers. J. Mater. Chem., 14(21), 3133-3138. doi:10.1039/b405769
Author Correction: Establishment and equilibrium levels of deleterious mutations in large populations (Scientific Reports, (2019), 9, 1, (10384), 10.1038/s41598-019-46803-7)
No full textThe original version of this Article contained errors. Affiliations 1 and 2 were reversed. Secondly, Affiliation 7 was incorrectly given as ‘Institute for Cellular and Molecular Medicine, Department of Immunology, and SAMRC Extramural Unit for Stem Cell Research and Therapy, Faculty of Health Sciences, University of Pretoria, Pretoria, 0084, South Africa’. Thirdly, an affiliation was omitted for the author Michael S. Pepper, which is now listed as Affiliation 8. Fourthly, Affiliation 1 was omitted for the author Johan W. Viljoen. Finally, Augustinus J. van Zyl was incorrectly affiliated with ‘Institute for Maternal and Child Health, IRCCS ‘Burlo Garofolo’, Trieste, Italy.’ The correct author affiliations are listed below: Affiliation 1: Department of Electrical, Electronic and Computer Engineering, EBIT, University of Pretoria, Pretoria 0028, South Africa Johan W. Viljoen and J. Pieter de Villiers Affiliation 2: Development, Research and Technology Department, Hensoldt Optronics, Centu..
Measurement of the ratio of prompt χ c to J / ψ production in pp collisions at √s = 7 TeV
Full text linkThe prompt production of charmonium χ c and J / ψ states is studied in proton-proton collisions at a centre-of-mass energy of √s = 7 TeV at the Large Hadron Collider. The χ c and J / ψ mesons are identified through their decays χ c → J / ψ γ and J / ψ → μ + μ - using 36 pb - 1 of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for χ c and J / ψ, σ (χ c → J / ψ γ) / σ (J / ψ), is determined as a function of the J / ψ transverse momentum in the range 2 < p T J / ψ < 15 GeV / c. The results are in excellent agreement with next-to-leading order non-relativistic expectations and show a significant discrepancy compared with the colour singlet model prediction at leading order, especially in the low p T J / ψ region
J. M. Coetzee in Context and Theory
No full textNobel Laureate and the first author to win the Booker Prize twice, J.M. Coetzee is perhaps the world's leading living novelist writing in English. Including an international roster of world leading critics and novelists, and drawing on new research, this innovative book analyses the whole range of Coetzee's work, from his most recent novels through his memoirs and critical writing. It offers a range of perspectives on his relationship with the historical, political, cultural and social context of South Africa. It also contextualises Coetzee's work in relation to his literary influences, colonial and post-colonial history, the Holocaust and colonial genocides, the 'politics' and meaning of the Nobel prize in South Africa and Coetzee's very public move from South Africa to Australia. Including a major unpublished essay by leading South African novelist André Brink, this book offers the most up-to-date study of Coetzee's work currently available.Intro -- Contents -- Acknowledgements -- Biographies -- Introduction -- Part I: Context -- 1. Post-Apartheid Literature: A Personal View -- 2. Elizabeth Costello as Post-Apartheid Text -- 3. Coetzee and Gordimer -- 4. Wordsworth and the Recollection of South Africa -- 5. Border Crossings: Self and Text -- 6. Sex, Comedy and Influence: Coetzee's Beckett -- Part II: Theory -- 7. Writing Desire Responsibly -- 8. Literature, History and Folly -- 9. Queer Bodies -- 10. Eating (Dis)Order: From Metaphoric Cannibalism to Cannibalistic Metaphors -- 11. Acts of Mourning -- 12. Sublime Abjection -- 13. Authenticity: Diaries, Chronicles, Records as Index-Simulations -- 14. Disrupting Inauthentic Readings: Coetzee's Strategies -- Index -- A -- B -- C -- D -- E -- F -- G -- H -- I -- J -- K -- L -- M -- N -- O -- P -- Q -- R -- S -- T -- U -- V -- W -- X -- YNobel Laureate and the first author to win the Booker Prize twice, J.M. Coetzee is perhaps the world's leading living novelist writing in English. Including an international roster of world leading critics and novelists, and drawing on new research, this innovative book analyses the whole range of Coetzee's work, from his most recent novels through his memoirs and critical writing. It offers a range of perspectives on his relationship with the historical, political, cultural and social context of South Africa. It also contextualises Coetzee's work in relation to his literary influences, colonial and post-colonial history, the Holocaust and colonial genocides, the 'politics' and meaning of the Nobel prize in South Africa and Coetzee's very public move from South Africa to Australia. Including a major unpublished essay by leading South African novelist André Brink, this book offers the most up-to-date study of Coetzee's work currently available.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
Measurement of the CP-violating phase \phi s in Bs->J/\psi\pi+\pi- decays
Full text linkMeasurement of the mixing-induced CP-violating phase phi_s in Bs decays is of prime importance in probing new physics. Here 7421 +/- 105 signal events from the dominantly CP-odd final state J/\psi pi+ pi- are selected in 1/fb of pp collision data collected at sqrt{s} = 7 TeV with the LHCb detector. A time-dependent fit to the data yields a value of phi_s=-0.019^{+0.173+0.004}_{-0.174-0.003} rad, consistent with the Standard Model expectation. No evidence of direct CP violation is found
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