159,961 research outputs found
Measurement of the ratio of prompt χ c to J / ψ production in pp collisions at √s = 7 TeV
No full textThe 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
Evidence for the decay B0→J/ψω and measurement of the relative branching fractions of meson decays to J/ψη and J/ψη′
No full textFirst 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)
A role for fibroblast growth factor type-1 in nephrogenic repair. Autocrine expression in rat kidney proximal tubule epithelial cells in vitro and in the regenerating epithelium following nephrotoxic damage by S-(1,1,2,2-tetrafluoroethyl)-L-cysteine in vivo
No full textThe regenerating proximal tubule epithelium in the rat has striking similarity with rat kidney proximal tubule epithelial cells (RPTE) in primary culture (Wallin, A., Zhang, G., Jones, T. W., Jaken, S., and Stevens, J. L. (1992) Lab. Invest. 66, 474-484). We used this in vitro model to investigate mechanisms which may regulate aspects of nephrogenic repair in vivo, and in particular the role of fibroblast (heparin-binding) growth factor type-1 (FGF-1) expression. FGF-1 was present predominantly as a 14.3-kDa polypeptide in rat kidney. Biological activity and mRNA for FGF-1 increased dramatically in primary RPTE in culture along with an increase in a 18.3-kDa FGF-1. Cycloheximide blocked FGF-1 expression in primary culture indicating that the increase represents newly synthesized factor rather than release from the extracellular matrix. The maximal increase in expression occurs after the peak of RPTE proliferation. Activity was not present in the medium but intracellular FGF-1 was released from RPTE by scrape wounding. Immunohistochemical analysis showed that FGF-1 expression increased in regenerating proximal tubule epithelial cells 5 days after nephrotoxic damage. Collectively, the data suggest that autocrine expression of FGF-1 by regenerating proximal tubule epithelial cells plays a role in the regulation of nephrogenic repair
Aster veitchianus Hutch. & J. R. Drumm. ex G. J. Zhang & T. G. Gao 2013, sp. nov.
No full textAster veitchianus Hutch. & J. R. Drumm. ex G. J. Zhang & T. G. Gao, sp. nov. Aster veitchianus Hutch. & J. R. Drumm. ex Ling (1935: 214), nom. inval. Type:— CHINA: Sichuan, Mt. E'mei, Qingyingge, alt. 950 m, 8 June 1933, X. B. Peng 6049 (holotype PE! [barcode no. 00300085]). Description: —Perennial with creeping rhizomes. Stem erect, single, 10–40 cm tall, branched in upper part or not, villous, densely at lower part. Leaves few, less than 10; basal leaves present at anthesis, obovate, 12–90 × 6–32 mm, apex acute or obtuse, base attenuate, margin sparsely serrate (1–4 pairs), petiole 10–45 mm long; lower leaves oblanceolate, 30–90 × 10–30 mm, apex acute or obtuse, base attenuate, margin entire or sparsely serrate (1–4 pairs), petiole 20–40 mm long, winged, semi-amplexicaul; median leaves usually 1–2, oblanceolate, 30–65 × 5–15 mm, apex acute, base semi-amplexicaul, margin entire, sessile; bracts 1–3, narrowly lanceolate or linear, 10–30 mm long, apex acute, margin entire, sessile. Leaves adaxial face green, sparsely villous; abaxial face light green, villous on midribs, glabrous or sparsely pilose on the rest parts. Capitula 1–4, solitary or loosely corymbiform, peduncles pilose. Involucres hemispherical, 8–12 mm in diameter; phyllaries 2-seriate, unequal, glabrous, apex acute, purplish, margin scarious, the outer phyllaries 3– 5 × 0.5 mm, the inner 8–10 × 0.8–1.2 mm. Ray florets 30–40, ligules 10–12 mm long, purplish, tube sparsely pilose. Disc florets 4–5 mm long, tube sparsely pilose. Achenes 1.5–2 mm long, oblanceolate, sparsely pilose. Pappus of barbellate bristles, whitish to slightly reddish, 2-seriate, the outer few, ca. 1 mm long, the inner 4–5 mm long. Flowers April–August. Fruits unknown. Distribution and habitat: — Aster veitchianus is found in E'mei county (Mt. E'mei) and Yinjin county, Sichuan province, China. It grows in forests and along roadsides at elevations of 800–1700 m. Etymology and ascription: —The specific epithet " veitchianus " was originally written on a specimen in K (E. H. Wilson 4981, K) by J. Hutchinson & J. R. Drummond, as the specimen was presented by Veitch Nurseries in the United Kingdom. Additional specimens examined (paratypes): — CHINA. Sichuan province, E'mei county, Mt. E'mei: Anonymous 18944 (PE [barcode no. 01694265]); E. H. Wilson 4981 (K, photo); G. H. Yang 55562 (PE [barcode no. 01694263]); Wuhan University 7628 (PE [barcode no. 01694264]); 19 June 1935, T. H. Hu 207 (PE [barcode no. 00300084]); 11 July 1937, S. S. Chien 6030 (PE [barcode no. 00300080]); 17 June 1939, C. L. Sun 537 (PE [barcode no. 00300081]); 4 June 1941, W. P. Fang 16837 (PE [barcode no. 01776712]); 29 May 1956, S. Z. Yu 49540 (SZ, photo [barcode no. 00265612]); 23 April 1957, Anonymous 54165 (PE [barcode no. 00300078]); 28 April 1957, G. H. Yang 55562 (PE [barcode nos. 01694263, 00300079]; SZ, photo [barcode no. 00265480]); 16 May 1957, Y. X. Xiao 30 (SZ, photo [barcode no. 00265649]); 20 May 1957, G. H. Yang 54653 (PE [barcode no. 00300082]); 29 May 1957, G. H. Yang 54953 (PE [barcode no. 00300083]); 1 June 1964, Y. L. Chen 011 (PE [barcode no. 00300075]); 3 June 1964, Y. L. Chen 017 (PE [barcode nos. 00300091, 00300092, 00300093]); 25 August 1964, K. J. Guan, J. W. Wang & C. L. Li 1717 (PE [barcode nos. 00300076, 00300077]); 7 June 1980, Z. Y. Zhang et al. 876 (PE [barcode no. 01824645]). Sichuan province, Yinjin county: 8 July 1938, Z. W. Yao 2252 (PE [barcode no. 00300087]); 22 June 1939, Z. W. Yao 3795 (PE [barcode no. 00300086]). Identification key to Aster veitchianus and A. auriculatus 1. Leaves less than 10, basal ones present at anthesis, the others at lower part of the stem, abaxial face not glandular; capitula 1–4; phyllaries glabrous ............................................................................................................ A. veitchianus – Leaves more than 15, basal ones withering at anthesis, the others at median and upper part of the stem, abaxial face glandular; capitula more than 10; phyllaries glandular ........................................................................... A. auriculatusPublished as part of Zhang, Guojin, Zhang, Caifei, Hu, Haihua & Gao, Tiangang, 2013, Validation of the name Aster veitchianus (Asteraceae), pp. 53-55 in Phytotaxa 152 (1) on pages 53-55, DOI: 10.11646/phytotaxa.152.1.6, http://zenodo.org/record/510067
The formation of the most massive : stars in the galaxy /
No full text\ua0tesis que para obtener el grado de Doctor en Ciencias (Astronomía), presenta Roberto J. Galván Madrid ; asesor Luis F. Rodríguez, Paul T. P. Ho, Qizhou Zhang. 177 páginas :\ua0ilustraciones. Doctorado en Ciencias (Astronomía)\ua0UNAM, Instituto de Astronomía,\ua0201
Supporting Data for “Engineering of a Highly Efficient Escherichia coli Strain for Mevalonate Fermentation through Chromosomal Integration”
No full textFull description in the file "WangReadme.rtf".
The files below includes the pathway design (Fig. 1) and the bioengineering experimental data. Figure numbers in associated paper also include raw experimental data. The concentrations of feedstock (glucose), intermediate (acetate and pyruvate), and product (mevalonate) were measured by high-performance liquid chromatography (HPLC). The dataset includes one ChemDraw (.cdx) file. CDX files can be opened with proprietary ChemDraw 12.0, distributed by CambridgeSoft.These files contain data along with associated output from instrumentation supporting all results reported in Wang, J.; Niyompanich, S.; Tai, Y.-S.; Wang, J.; Bai, W.; Mahida, P.; Gao, T.; Zhang, K. Engineering of a highly efficient escherichia coli strain for mevalonate fermentation through chromosomal integration. Appl. Environ. Microbiol., 2016, 82, 7176–7184. Chromosomal integration of heterologous metabolic pathways is optimal for industrially relevant fermentation, as plasmid-based fermentation causes extra metabolic burden and genetic instabilities. In this work, chromosomal integration was adapted for the production of mevalonate, which can be readily converted into β-methyl-δ-valerolactone, a monomer for the production of mechanically tunable polyesters. The mevalonate pathway, driven by a constitutive promoter, was integrated into the chromosome of Escherichia coli to replace the native fermentation gene adhE or ldhA. The engineered strains (CMEV-1 and CMEV-2) did not require inducer or antibiotic and showed slightly higher maximal productivities (0.38 to ∼0.43 g/liter/h) and yields (67.8 to ∼71.4% of the maximum theoretical yield) than those of the plasmid-based fermentation. Since the glycolysis pathway is the first module for mevalonate synthesis, atpFH deletion was employed to improve the glycolytic rate and the production rate of mevalonate. Shake flask fermentation results showed that the deletion of atpFH in CMEV-1 resulted in a 2.1-fold increase in the maximum productivity. Furthermore, enhancement of the downstream pathway by integrating two copies of the mevalonate pathway genes into the chromosome further improved the mevalonate yield. Finally, our fed-batch fermentation showed that, with deletion of the atpFH and sucA genes and integration of two copies of the mevalonate pathway genes into the chromosome, the engineered strain CMEV-7 exhibited both high maximal productivity (∼1.01 g/liter/h) and high yield (86.1% of the maximum theoretical yield, 30 g/liter mevalonate from 61 g/liter glucose after 48 h in a shake flask).This research was supported by a grant from the National Science Foundation through the Center for Sustainable Polymers (grant CHE-1413862).Zhang, Kechun; Wang, Jilong; Niyompanich, Suthamat; Tai, Yi-Shu; Wang, Jingyu; Mahida, Prithviraj; Gao, Tuo. (2017). Supporting Data for “Engineering of a Highly Efficient Escherichia coli Strain for Mevalonate Fermentation through Chromosomal Integration”. Retrieved from the University Digital Conservancy, https://doi.org/10.13020/D6W89N
Observational data in 8 representative cities of Central-Eastern China
No full textArchived here are the input data for MIR calculation in 8 representative cities of Central-Eastern China in the paper: Zhang, Y., Xue, L., Mu, J., Chen, T., Li, H., Gao, J., and Wang W.: Developing the maximum incremental reactivity for volatile organic compounds in major cities of Central-Eastern China, Journal of Geophysical Research, in review, 202
Lomagramma J. Sm., J. Bot. (Hooker
No full text42.28. Lomagramma J.Sm., J. Bot. (Hooker) 3: 402 (1841). T.: Lomagramma pteroides J.Sm.Published as part of Christenhusz, Maarten J. M., Zhang, Xian-Chun & Schneider, Harald, 2011, A linear sequence of extant families and genera of lycophytes and ferns, pp. 7-54 in Phytotaxa 19 on page 50, DOI: 10.11646/phytotaxa.19.1.2, http://zenodo.org/record/489399
Salpichlaena J. Sm., J. Bot. (Hooker
No full text39.1. Salpichlaena J.Sm., J. Bot. (Hooker) 4: 168 (1841), as 'Salpichloena'. T.: Salpichlaena volubilis (Kaulf.) J.Sm. (Blechnum volubile Kaulf.)Published as part of Christenhusz, Maarten J. M., Zhang, Xian-Chun & Schneider, Harald, 2011, A linear sequence of extant families and genera of lycophytes and ferns, pp. 7-54 in Phytotaxa 19 on page 48, DOI: 10.11646/phytotaxa.19.1.2, http://zenodo.org/record/489399
Doryopteris J. Sm., J. Bot. (Hooker
No full text31.32. Doryopteris J.Sm., J. Bot. (Hooker) 3: 404 (1841), nom. cons. T.: Doryopteris palmata (Willd.) J.Sm. (Pteris palmata Willd.)Published as part of Christenhusz, Maarten J. M., Zhang, Xian-Chun & Schneider, Harald, 2011, A linear sequence of extant families and genera of lycophytes and ferns, pp. 7-54 in Phytotaxa 19 on page 46, DOI: 10.11646/phytotaxa.19.1.2, http://zenodo.org/record/489399
- …
