982 research outputs found
Conserved ortholog sets in forest trees
No full textPutative single-copy genes and conserved ortholog sets (COS) were identified in model plant species thale cress (Arabidopsis thaliana), rice (Oryza sativa ssp. japonica), and poplar [black cottonwood, Populus trichocarpa (Torr. & Gray ex Brayshaw)] and used to find putative COS in four conifers (the Coniferales order). Using expressed sequence tag sequences, unique transcript sets were assembled in loblolly pine (Pinus taeda L.), white spruce [Picea glauca (Moench) Voss], Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco var. menziesii], and sugi [Cryptomeria japonica (Thunberg ex Linnaeus f.) D. Don]. They were compared with COS sets identified in three model plant species using comparative sequence analysis. Almost half of the single-copy genes in herbaceous species (Arabidopsis and rice) had additional copies and homologs in poplar and conifers. The identified tentative COS sets have many applications in evolutionary genomics studies, phylogenetic analysis, and comparative mapping
Recent observation of D** and D**s at Belle
No full textWe report on the first observation of B̄0→D1(2430)0ω, B̄0→D1(2420)0ω and B̄0→D2*(2460)0ω decays and determination of their rates as well as the fractions of longitudinal polarizations of the ω for these decays. We also discuss improved measurements of the B→DD*s0(2317) branching fractions with a search for isospin partners of the D*s0(2317)+ state, Z0 and Z++. These measurements use a data sample containing 772 million BB̄ events collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider
Cutting'aesthetic teeth' : Flannery O'Connor's habit of art
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Comunicação e ExpressãoEste trabalho foi sugerido pela afirmação de Flannery O'Connor que sua "dedicação estética" nasceu através do contato com Art and Scholasticism de Jacques Maritain. O propósito foi chegar a uma interpretação do sentido da frase. Uma investigação detalhada foi feita do conteúdo de Art and Scholasticism, posteriormente contrastada com os resultados de uma pesquisa feita em seus ensaios e suas cartas, o que revelou numerosos ecos de diversos trechos constando no texto de Maritain. Três pontos principais foram escolhidos como critérios na análise do hábito artístico de O'Connor: 1) a prática de arte implica uma luta; 2) a arte somente pode ser percebida pelos sentidos; e 3) a prática de arte exige do artista a dedicação indivisa à obra nascente. O estudo conclui que, para O'Connor, o brotar da dentição estética, através da leitura de Art and Scholasticism, significou que, ao perceber na análise da natureza da arte algo com que podia concordar, ela reconheceu tanto sua própria capacidade de tornar-se uma artista literária, quanto sua vontade de assumir a tarefa de desenvolver em sua pessoa o hábito de arte
Measurement of the branching fractions for Cabibbo-suppressed decays D+→K+K−π+π0 and D(s)+→K+π−π+π0 at Belle
No full textWe present measurements of the branching fractions for the singly Cabibbo-suppressed decays D+→K+K−π+π0 and D+s→K+π−π+π0, and the doubly Cabibbo-suppressed decay D+→K+π−π+π0, based on 980 fb−1 of data recorded by the Belle experiment at the KEKB e+e− collider. We measure these modes relative to the Cabibbo-favored modes D+→K−π+π+π0 and D+s→K+K−π+π0. Our results for the ratios of branching fractions are B(D+→K+K−π+π0)/B(D+→K−π+π+π0)=(11.32±0.13±0.26)%, B(D+→K+π−π+π0)/B(D+→K−π+π+π0)=(1.68±0.11±0.03)%, and B(D+s→K+π−π+π0)/B(D+s→K+K−π+π0)=(17.13±0.62±0.51)%, where the uncertainties are statistical and systematic, respectively. The second value corresponds to (5.83±0.42)×tan4θC, where θC is the Cabibbo angle; this value is larger than other measured ratios of branching fractions for a doubly Cabibbo-suppressed charm decay to a Cabibbo-favored decay. Multiplying these results by world average values for B(D+→K−π+π+π0) and B(D+s→K+K−π+π0) yields B(D+→K+K−π+π0)=(7.08±0.08±0.16±0.20)×10^−3, B(D+→K+π−π+π0)=(1.05±0.07±0.02±0.03)×10^−3, and B(D+s→K+π−π+π0)=(9.44±0.34±0.28±0.32)×10^−3, where the third uncertainty is due to the branching fraction of the normalization mode. The first two results are consistent with, but more precise than, the current world averages. The last result is the first measurement of this branching fraction
Search for baryon and lepton number violating decays D →pl
No full textWe search for the baryon and lepton number violating charm decays, D→pl, where D is either a D0 or a D ̄0 and l is a muon or an electron, using a data sample of 921 fb-1 collected by the Belle detector at the KEKB asymmetric energy e+e- collider. In the absence of significant signals, we set upper limits on the branching fractions in the range (5-8)×10-7 at a 90% confidence level, depending on the decay mode
First observation of B → D ̄_1 (→ D ̄ π+π-) l+ν l and measurement of the B → D ̄(∗) π l+ νl and B → D ̄(∗) π+ π- l+ νl branching fractions with hadronic tagging at Belle
No full textWe report measurements of the ratios of branching fractions for B→D ̄(∗)πl+νl and B→D ̄(∗)π+π-l+νl relative to B→D ̄∗l+νl decays with l=e, μ. These results are obtained from a data sample that contains 772×106BB ̄ pairs collected near the Υ(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider. Fully reconstructing both B mesons in the event, we obtain B(B0→D ̄0π-l+νl)B(B0→D∗-l+νl)=(7.23±0.36±0.14)%, B(B+→D-π+l+νl)B(B+→D ̄∗0l+νl)=(6.78±0.24±0.18)%, B(B0→D ̄∗0π-l+νl)B(B0→D∗-l+νl)=(11.10±0.48±0.23)%, B(B+→D∗-π+l+νl)B(B+→D ̄∗0l+νl)=(9.50±0.33±0.34)%, B(B0→D-π+π-l+νl)B(B0→D∗-l+νl)=(2.91±0.37±0.26)%, B(B+→D ̄0π+π-l+νl)B(B+→D ̄∗0l+νl)=(3.10±0.26±0.22)%, B(B0→D∗-π+π-l+νl)B(B0→D∗-l+νl)=(0.99±0.43±0.20)%, B(B+→D ̄∗0π+π-l+νl)B(B+→D ̄∗0l+νl)=(1.25±0.27±0.15)%, where the uncertainties are statistical and systematic, respectively. These are the most precise measurements of these branching fraction ratios to date. The invariant mass spectra of the Dπ, D∗π, and Dππ systems are studied, and the branching fraction products B(B0→D2∗-l+νl)×B(D2∗-→D ̄0π-)=(0.157±0.015±0.005)%, B(B+→D ̄0∗0l+νl)×B(D ̄0∗0→D-π+)=(0.054±0.022±0.005)%, B(B+→D ̄2∗0l+νl)×B(D ̄2∗0→D-π+)=(0.163±0.011±0.008)%, B(B0→D1-l+νl)×B(D1-→D ̄∗0π-)=(0.306±0.050±0.029)%, B(B0→D1′-l+νl)×B(D1′-→D ̄∗0π-)=(0.206±0.068±0.025)%, B(B0→D2∗-l+νl)×B(D2∗-→D ̄∗0π-)=(0.051±0.040±0.010)%, B(B+→D ̄10l+νl)×B(D ̄10→D∗-π+)=(0.249±0.023±0.015)%, B(B+→D ̄1′0l+νl)×B(D ̄1′0→D∗-π+)=(0.138±0.036±0.009)%, B(B+→D ̄2∗0l+νl)×B(D ̄2∗0→D∗-π+)=(0.137±0.026±0.009)%, B(B0→D1-l+νl)×B(D1-→D-π+π-)=(0.102±0.013±0.009)%, B(B+→D ̄10l+νl)×B(D ̄10→D ̄0π+π-)=(0.105±0.011±0.009)%, are extracted. This is the first observation of the decays B→D ̄1l+νl with D1→Dπ+π-
Search for rare decays B+ → Ds (∗)+ η, Ds (∗)+ K ̄ 0, D+η, and D+K0
No full textWe present a study of rare decay modes B+→Ds+h0, B+→Ds∗+h0, and B+→D+h0, where h0 denotes the neutral meson η or K0, using a data sample of (772±10)×106 BB ̄ events produced at the Υ(4S) resonance. The data were collected by the Belle detector operating at the asymmetric-energy KEKB collider. We find no evidence for these decays, so we set upper limits at the 90% confidence level on the branching fractions of B+→Ds+h0, Ds∗+h0, and D+h0 decay modes. Along with these rare decay modes, we report improved measurements of the color-suppressed decay branching fractions B(B ̄0→D0η)=(26.6±1.2±2.1)×10-5 and B(B ̄0→D0K̄0)=(5.6±0.5±0.2)×10-5. The first and second quoted uncertainties are statistical and systematic, respectively
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No full textO balanço de carbono do Broa, foi realizado considerando-o como um sistema \"caixa preta\", no qual foram considerados apenas os compartimentos de entradas e saídas. As entredas de carbono foram quantificadas, periodicamente, nos compartimentos;afluentes, lençol freático e interface atmosfera-água, contribuindo com 19,93%, 17,38% e 24,05%, respectivamente. Também considerou-se como entrada, as macrófitas do reservatório, contribuindo com: 38,64%. As saídas foram quantificadas noscompartimentos: efluente, sedimento e interface atmosfera-água, contribuindo com 20,04%, 76,94% e 3,02%, respectivamente. Neste trabalho foi desenvolvido um método para determinação da taxa de sedimentação do carbono, usando-se a sílica comotraçador. Como resultado final, obteve-se para entrada de carbono no reservatório o valor de \'376,12 mgC.m POT.-2 .d POT.\' e para saída, \'614,42 mgC.m POT.-2 .d.POT.-1\'. Teoricamente, o valor para o balanço deveria ser zero, por se tratar de umacaixa preta imutável. No entanto, obteve-se um saldo negativo de \'-238,30 mgC.m POT.-2 .d POT.-1\'The carbon budget of Broa reservoir, was established in a \"black-box\" treatment, in which only the compartments of input and output were considered. Carbons inputs were quantified perodically in the compartments: stream inflow, groundwater and atmosphere-water interface, contributing with 19,93%, 17,38% and 24,05%, respectively. Macrophytes of the reservoir were also tireated as an entry contributing with 38,64%. The outputs were quantified in the compartments: stream outflow, sediment and atmosphere-water interface, contributming with 20,04%, 76,94% and 3,02%, respectively. In this work a method was developed to detemúne the carbon sedúnentation rate, using sílica as a tracer. As a fínal input result 376,12 mg.Cm .d were obtained and for the output 614,42 mg.Cm-2.d-1. Theoretically, the value of the balance should be zero, because an unchangeable \"black box\" was assumed. In stead of a null balance a deficit of-238,30 mg.Cm-2.d-1 was obtained
Measurements of the branching fractions B (B ̄0 → D∗+ π-) and B(B ̄0 →D∗+ K-) and tests of QCD factorization
No full textUsing (771.6±10.6)×106 BB ̄ meson pairs recorded by the Belle experiment at the KEKB e+e- collider, we report the branching fractions B(B ̄0→D∗+π-)=(2.62±0.02±0.09)×10-3 and B(B ̄0→D∗+K-)=(2.22±0.06±0.08)×10-4; the quoted uncertainties are statistical and systematic, respectively. A measurement of the ratio of these branching fractions is also presented, RK/π=B(B ̄→D∗+K-)/B(B ̄→D∗+π-)=(8.41±0.24±0.13)×10-2, where systematic uncertainties due to the D∗+ meson reconstruction cancel out. Furthermore, we report a new QCD factorization test based on the measured ratios for B ̄→D∗+h- and B ̄→D∗+l-ν decays at squared momentum transfer values equivalent to the mass of the h=π or K hadron. The parameters |a1(h)| are measured to be |a1(π)|=0.884±0.004±0.003±0.016 and |a1(K)|=0.913±0.019±0.008±0.013, where the last uncertainties account for all external inputs. These values are approximately 15% lower than those expected from theoretical predictions. Subsequently, flavor SU(3) symmetry is tested by measuring the ratios for pions and kaons, |a1(K)|2/|a1(π)|2=1.066±0.042±0.018±0.023, as well as for different particle species. The ratio is consistent with unity and therefore no evidence for SU(3) symmetry breaking effects is found at the 5% precision level
Study of e+e- → D (1 S,2 S)η and e+e- → D (1S)η′ at s =10.866 GeV with the Belle detector
No full textWe report the first observation of the processes e+e-→D(1S,2S)η at s=10.866 GeV, with significance exceeding 10σ for both processes. The measured Born cross sections are σ(e+e-→D(2S)η)=2.07±0.21±0.19 pb, and σ(e+e-→D(1S)η)=0.42±0.08±0.04 pb. We also set the upper limit on the cross section of the process e+e-→D(1S)η′ to be σ(e+e-→D(1S)η′)<0.037 pb at 90% C.L. The results are obtained with the data sample collected with the Belle detector at the KEKB asymmetric-energy e+e- collider in the energy range from 10.63 to 11.02 GeV
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