223 research outputs found
Supersymmetric vertex algebras
We define and study the structure of SUSY Lie conformal and vertex algebras.
This leads to effective rules for computations with superfields.Comment: 71 page
Measurement of the Charged Multiplicities in b, c and Light Quark Events from Z0 Decays
Average charged multiplicities have been measured separately in , and
light quark () events from decays measured in the SLD experiment.
Impact parameters of charged tracks were used to select enriched samples of
and light quark events, and reconstructed charmed mesons were used to select
quark events. We measured the charged multiplicities:
,
, from
which we derived the differences between the total average charged
multiplicities of or quark events and light quark events: and . We compared
these measurements with those at lower center-of-mass energies and with
perturbative QCD predictions. These combined results are in agreement with the
QCD expectations and disfavor the hypothesis of flavor-independent
fragmentation.Comment: 19 pages LaTex, 4 EPS figures, to appear in Physics Letters
Measurement of the B0-anti-B0-Oscillation Frequency with Inclusive Dilepton Events
The - oscillation frequency has been measured with a sample of
23 million \B\bar B pairs collected with the BABAR detector at the PEP-II
asymmetric B Factory at SLAC. In this sample, we select events in which both B
mesons decay semileptonically and use the charge of the leptons to identify the
flavor of each B meson. A simultaneous fit to the decay time difference
distributions for opposite- and same-sign dilepton events gives ps.Comment: 7 pages, 1 figure, submitted to Physical Review Letter
Desafios polĂticos para a consolidação do Sistema Ănico de SaĂşde: uma abordagem histĂłrica
Measurement of the CP-Violating Asymmetry Amplitude sin2
We present results on time-dependent CP-violating asymmetries in neutral B decays to several CP eigenstates. The measurements use a data sample of about 88 million Y(4S) --> B Bbar decays collected between 1999 and 2002 with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We study events in which one neutral B meson is fully reconstructed in a final state containing a charmonium meson and the other B meson is determined to be either a B0 or B0bar from its decay products. The amplitude of the CP-violating asymmetry, which in the Standard Model is proportional to sin2beta, is derived from the decay-time distributions in such events. We measure sin2beta = 0.741 +/- 0.067 (stat) +/- 0.033 (syst) and |lambda| = 0.948 +/- 0.051 (stat) +/- 0.017 (syst). The magnitude of lambda is consistent with unity, in agreement with the Standard Model expectation of no direct CP violation in these modes
Genome-Wide Association Study in BRCA1 Mutation Carriers Identifies Novel Loci Associated with Breast and Ovarian Cancer Risk
BRCA1-associated breast and ovarian cancer risks can be modified by common genetic variants. To identify further cancer risk-modifying loci, we performed a multi-stage GWAS of 11,705 BRCA1 carriers (of whom 5,920 were diagnosed with breast and 1,839 were diagnosed with ovarian cancer), with a further replication in an additional sample of 2,646 BRCA1 carriers. We identified a novel breast cancer risk modifier locus at 1q32 for BRCA1 carriers (rs2290854, P = 2.7Ă10-8, HR = 1.14, 95% CI: 1.09-1.20). In addition, we identified two novel ovarian cancer risk modifier loci: 17q21.31 (rs17631303, P = 1.4Ă10-8, HR = 1.27, 95% CI: 1.17-1.38) and 4q32.3 (rs4691139, P = 3.4Ă10-8, HR = 1.20, 95% CI: 1.17-1.38). The 4q32.3 locus was not associated with ovarian cancer risk in the general population or BRCA2 carriers, suggesting a BRCA1-specific associat
Track D Social Science, Human Rights and Political Science
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/138414/1/jia218442.pd
Use of secondary forests by understory birds in a fragmented landscape in central Amazonia
Rates of deforestation in the Brazilian Amazon have increased since 1991 and forecasts are not optimistic about the slowing of this process. Some authors believe that the Amazon may be experiencing a massive process of species extinction. However, the deforestation is accompanied by the expansion of secondary forests that are established in the abandoned areas. The trend is an increase in secondary forests cover, resulting in a mosaic of primary forest (FP) and fragments separated by an array of secondary forests (FS). In this scenario, the prediction of a massive extinction could be wrong if many species could survive in the secondary forests. To assess the importance of FS for the understory birds we sampled areas in regeneration and a continuous forest of a fragmented landscape. We conducted mist netting (24 nets/day) for six consecutive days/month, for 8 months (May-November) in 2009. Some forest species as do not seem to be adapted to the secondary forest environment and their occurrences are restricted to continuous forest environments. But most focal species showed no significant difference in apparent survival rates between the enviroments, suggesting that these species inhabit the secondary forest and the primary forest similarly. Because most of the matrix in fragmented landscapes are composed by secondary forests, such results highlights the conservation value that these habitats present in the long term. Thus, FS should be regarded as dynamic matrix that not only allows the movement of individuals but also function as habitat for many species typical of FP.Na AmazĂ´nia, as taxas de desmatamento crescem desde 1991 e as previsĂľes nĂŁo sĂŁo otimistas quanto Ă desaceleração desse processo. A devastação da floresta ĂŠ acompanhada de uma expansĂŁo de florestas secundĂĄrias (FS) que se estabelecem nas ĂĄreas abandonadas. A tendĂŞncia ĂŠ um aumento de florestas secundĂĄrias, resultando num mosaico de floresta contĂnua e fragmentos separados por uma matriz de FS. Nesse cenĂĄrio, autores acreditam que a AmazĂ´nia pode passar por um processo massivo de extinção de espĂŠcies. Por outro lado, a previsĂŁo de um processo massivo de extinção pode ser equivocada, pois muitas espĂŠcies florestais poderiam sobreviver nas florestas secundĂĄrias. Para avaliar o valor das florestas secundĂĄrias para espĂŠcies florestais amostramos por oito meses com redes de neblina uma capoeira (FS) em regeneração e uma floresta primĂĄria (FP) de uma paisagem fragmentada. Algumas espĂŠcies nĂŁo foram capturadas na capoeira e aparentemente evitam esse tipo de hĂĄbitat. No entanto, a maioria das espĂŠcies do grupo focal nĂŁo apresentou diferença na sobrevivĂŞncia aparente entre os ambientes, o que nos indica que estĂŁo habitando a capoeira e a floresta primĂĄria da mesma forma. Na realidade amazĂ´nica, onde grande parte da matriz ĂŠ composta por floresta secundĂĄria, a matriz tem valor para conservação e deve ser analisada como um elemento dinâmico que nĂŁo apenas permite a movimentação de indivĂduos, mas tambĂŠm serve de hĂĄbitat para muitas espĂŠcies de floresta primĂĄria. Mas ressaltamos que ĂŠ fundamental a preservação de ĂĄreas de floresta primĂĄria que servirĂŁo de fonte Ă s florestas secundĂĄrias adjacentes
PatogĂŞnese e achados clĂnicos, hematolĂłgicos e anatomopatolĂłgicos da infecção por Rangelia vitalii em 35 cĂŁes (1985-2009)
GRAPEVINE VIRUS DISEASES:ECONOMIC IMPACT AND CURRENT ADVANCES IN VIRAL PROSPECTION AND MANAGEMENT
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