370,657 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)
APC/C and SCFcyclin F Constitute a Reciprocal Feedback Circuit Controlling S-Phase Entry
Full text linkSummaryThe anaphase promoting complex/cyclosome (APC/C) is an ubiquitin ligase and core component of the cell-cycle oscillator. During G1 phase, APC/C binds to its substrate receptor Cdh1 and APC/CCdh1 plays an important role in restricting S-phase entry and maintaining genome integrity. We describe a reciprocal feedback circuit between APC/C and a second ubiquitin ligase, the SCF (Skp1-Cul1-F box). We show that cyclin F, a cell-cycle-regulated substrate receptor (F-box protein) for the SCF, is targeted for degradation by APC/C. Furthermore, we establish that Cdh1 is itself a substrate of SCFcyclin F. Cyclin F loss impairs Cdh1 degradation and delays S-phase entry, and this delay is reversed by simultaneous removal of Cdh1. These data indicate that the coordinated, temporal ordering of cyclin F and Cdh1 degradation, organized in a double-negative feedback loop, represents a fundamental aspect of cell-cycle control. This mutual antagonism could be a feature of other oscillating systems
The Effects of Salts and Nucleotide Triphosphates on the Transcription Termination of Bacteriophage RNA Polymerases
No full textFigures 2-6 from: Jeng M, Engel M, Yang P (2011) Discovery of the female of Pyrocoelia prolongata in Taiwan (Coleoptera, Lampyridae). ZooKeys 116: 49-57. https://doi.org/10.3897/zookeys.116.1412
No full textFigures 2-6 - Pyrocoelia prolongata Jeng and Lai, female 2 Antenna 3 Partial head in frontal aspect (frons, antennal sockets, clypeus-labrum, and mandibles), antennae removed 4 Hind leg (metatrochanter–metatarsus) 5 Thoracic segments (TH1–3), coxae (CX1–3), and first abdominal segment (AB1), lateral aspect; sp (#) = spiracle on #th segment 6 Abdominal segments 6–8, ventral aspect, T#, P#, and S# = abdominal tergite, pleurite, and sternite of #th segment; PO = photogenic organs
Oculogryphus, A Remarkable New Genus of Fireflies from Asia (Coleoptera: Lampyridae)
No full textFig. 5. Oculogryphus fulvus, new genus and species, male, basal half of elytra, lateral aspect.Published as part of JENG, M.-L., ENGEL, MICHAEL S. & YANG, P.-S., 2007, Oculogryphus, A Remarkable New Genus of Fireflies from Asia (Coleoptera: Lampyridae), pp. 1-20 in American Museum Novitates 3600 on page 7, DOI: 10.1206/0003-0082(2007)3600[1:OARNGO]2.0.CO;2, http://zenodo.org/record/538905
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