239,176 research outputs found
Osiadanie terenu i jego wpływ na środowisko w chińskich regionach Xu Zhou, Yan Zhou oraz Huainan i Huaibei
No full textThe main coal mining subsidence area of the Xu Zhou, Yan Zhou, Huaihe collapsed state region were investigated including the environment state, water surface area, pollution source, and the utilization state. Some advice wasproposed to protect the environment of the subsidence area.Badaniem objęto główną strefę osiadania w stanie całkowitego zawału w chińskich regionach Xu Zhou, Yan Zhou i Huaihe, w tym stan otoczenia, wody powierzchniowe, źródła zanieczyszczenia oraz utylizację. Zaproponowano kilka rozwiązań dla ochrony środowiska strefy osiadania
Junior Recital, Binyan Xu, piano
Full text linkJunior RecitalBinyan Xu, pianoMonday, November 18, 2019 at 7pmRecital HallJames W. Black Music Center1015 Grove AvenuRichmond, Va.
Program information as announced
Long term observation of sub-saturation hygroscopicity in North Atlantic
No full textThis dataset reports the results of in situ measurements near 5 years aerosol hygroscopic growth factor from 2009 to 2014 at Mace Head Research Station(53.33° N, 9.90 °W; 21m a.m.s.l; 300m from the waterline). This dataset is discussed in a manuscript titled "Seasonal trends of aerosol hygroscopicity and mixing state of clean marine and polluted continental masse at Mace Head" by "Wei Xu, Jurgita Ovadnevaite, Kirsten. Fossum, Chunshui Lin, Ru-Jin Huang, Colin O’Dowd, Darius Ceburnis" which is submitted to Journal of Geophysics Research: Atmospheres
Senior Recital, Binyan Xu, piano, video
Full text linkVCU DEPARTMENT OF MUSIC
SENIOR RECITAL
Binyan Xu, piano
Tuesday, November 24 at 4:00 p.m.
Sonia Vlahcevic Concert Hall | W. E. Singleton Center for the Performing Arts
922 Park Avenue | Richmond, Va
Sublytic complement C5b-9 complexes induce thrombospondin-1 production in rat glomerular mesangial cells via PI3-k/Akt: association with activation of latent transforming growth factor-beta1
No full textMesangial cell proliferation is a common cellular response to a variety of different types of glomerular injury. Complement C5b‐9 is a prime candidate to mediate mesangial cell proliferation, especially sublytic C5b‐9, which can induce the production of multiple inflammatory factors and cytokines. Transforming growth factor (TGF)‐β1 plays a major role in the accumulation of extracellular matrix (ECM), while thrombospondin (TSP)‐1 has been identified as an activator of latent TGF‐β1 in an in vitro system. Using rat glomerular mesangial cells (GMCs) as a model system, we assessed the effect of sublytic C5b‐9 on the expression of TSP‐1 and TGF‐β1 and explored the relevant pathway of signal transduction. First, we ensured the concentrations of anti‐Thy1 antibody and complement, which were regarded as a sublytic C5b‐9 dose, and examined whether the sublytic C5b‐9 induced expression of TSP‐1 in rat GMCs which, in turn, activated latent TGF‐β1 by real‐time polymerase chain reaction (PCR) and enzyme‐linked immunosorbent assay (ELISA), respectively. Then, we investigated the role of the PI3‐k/Akt pathway in sublytic C5b‐9‐induced TSP‐1 production in rat GMCs by Western blot analysis. The addition of sublytic C5b‐9 (5% anti‐Thy1 antibody and 4% normal serum) to rat GMCs induced activation of latent TGF‐β1 via TSP‐1. The addition of sublytic C5b‐9 apparently increased the protein of Akt phosphorylation, whereas PI3‐k inhibitor LY294002 could clearly reduce the increase of TSP‐1 induced by sublytic C5b‐9. These results indicate that TSP‐1 is an activator of latent TGF‐β1 in sublytic C5b‐9‐induced rat GMCs; furthermore, the PI3‐k/Akt signal transduction pathway may play a key role in sublytic C5b‐9‐induced TSP‐1 production
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Retraction: Site‐specific recombination of nitrogen‐fixation genes in cyanobacteria by XisF–XisH–XisI complex: Structures and models, William C. Hwang, James W. Golden, Jaime Pascual, Dong Xu, Anton Cheltsov, Adam Godzik
Full text linkThe above article from the Proteins: Structure, Function, and Bioinformatics, published online on 1 September 2014 in Wiley Online Library as Accepted Article (http://onlinelibrary.wiley.com/doi/10.1002/prot.24679/full), has been retracted by agreement between William C. Hwang, James W. Golden, Jaime Pascual, Dong Xu, Anton Cheltsov, Adam Godzik, the Editor‐in‐Chief, Bertrand E. Garcia‐Moreno, and Wiley Periodicals, Inc. The retraction has been agreed because submission was made without agreement from co‐author Adam Godzik
Methane Activation by Transition-Metal Oxides, MOx (M=Cr, Mo, W; x=1,2,3)
No full textRecent experiments on the dehydrogenation-aromatization of methane (DHAM) to form benzene using a MoO3/HZSM-5 catalyst stimulated us to examine methane activation by the transition-metal oxide molecules, MOx (M = Cr, Mo, W; x = 1, 2, 3). The present studies use hybrid density functional theory (B3LYP). The reactivity trend is rationalized in terms of changes in the electrophilicity of MO,, the strength of the M-O pi bond, and the bonding properties of MQ(x) to methyl or hydrogen as M and x are varied, It is found that or-bond metathesis to the metal hydride product (H-MOx-1-OCH3) occurs preferentially over the high oxidation state form (MO3) of the heavier metals, as well as all chromium oxides (CrOx). Instead, oxidative addition of MOx leading to methyl metal hydride (H-M(O-x)-CH3) is more favorable over the low oxidation state of MOx (M = Mo, W, x = 2, 1). In particular, it is found that WO2 can undergo oxidative addition with negligible activation barrier and is predicted to be the most reactive compound of this class toward methane activation. Our finding that MO2 (M = W, Mo) is the best oxidation state for this class of metal oxides toward methane activation suggests that the MO3/HZSM-5 catalysts active in the DHAM reaction may be W and Mo oxycarbides (MO2C2). The formation of such intermediates may be the reason that the experiments find an induction period before the catalyst is active for the desired reaction
Prof. Th. W. Adorno and the author Hans Erich Nossack.
No full textProf. Th. W. Adorno and the author Hans Erich Nossack at a reception of Insel Verlag, Buchmesse Frankfurt 1966LB
Arxiella longispora Yue Xu, T. Qiu, S. Gao, W. Meng & L. J. Xu. 2023, sp. nov.
No full text<i>Arxiella longispora</i> Yue Xu, T. Qiu, S. Gao, W. Meng & L.J. Xu. <i>sp</i>. <i>nov</i>. (FIGURE 3) <p>Mycobank No.: MB838820</p> <p> <b>Type:</b> — CHINA. HEILONGJIANG: Greater Hinggan Mountains, 52.33°N, 124.7°E, alt. Ex leaves <i>(Populus davidiana</i>., <i>Betula platyphylla</i>, <i>Larix gmelinii</i>. and <i>Pinus Sylvestris</i>) litter (MEFL706), 10 Oct, 2017, J. Liang, B. Liu, W. Meng, Q. Wang & L. Xu, HMPHU 1245 (holotype). Ex-type living culture CCTCC M 2021101 (SGSF 303). GenBank: ITS = MT 921658; LSU = MW 519910; <i>rpb2</i> = MW 717995; <i>tef1</i> = MW 883564.</p> <p> <i>Colonies</i> on PDA, and MEA, reaching 22.00– 22.33 mm after 12 d, smooth, velvet, firstly off-white hyphae, becoming grayish-brown on PDA or grayish-green on MEA after 1 wk; reverse amber, with off-white, smooth, even margin; exudate clear. <i>Colonies</i> on OA reaching 22.00 mm after 12 d, smooth with white hyphae, light yellow to light brown plaques; aerial hyphae sparse, with wavy edge after 3 wk; reverse milk white (Fig. S1). <i>Colonies</i> on CMA reaching 16 mm after 12 d; aerial hyphae dense, becoming grayish towards the outside with black secretions; reverse dark gray (FIGURE S1).</p> <p> <i>Hyphae</i> septate, branched, hyaline to brown, 1.5–5 μm diam. <i>Conidiophores</i> filamentous, smooth, unbranched, or dichotomously branched, ovoid, clavate, cylindrical or irregular. <i>Conidia</i> (13–)14–22(–24) × 3–4 μm (x̄ = 17.8 × 3.5 μm, n = 100), reniform or cylindrical, hyaline, smooth, guttulate, solitary or occasionally interconnected, medianly 1-septate or no septate, inner plane with apical and basal horn-like appendages, with or without a slightly raised hilum near the base of one of the appendages. <i>Chlamydospores</i> absent. <i>Sexual morph</i> absent.</p> <p>The optimal temperatures for the colony growth of SGSF 303 on PDA were in the range of 20 ℃ to 25 ℃ where the colony reached around 22 mm diam. in 12 d (FIGURE S2). Growth rates were similar between pH 5 and 10 on PDA for 12 d, but at the pH 4 the fungus had significantly reduced growth speed (5.67 mm, FIGURE S2).</p> <p> <b>Diagnosis:</b> — <i>Colonies</i> grayish brown on surface; <i>conidiophore</i> hyaline, dichotomously branched; <i>conidia</i> up to more than 20 μm long, hyaline, reniform or cylindrical, inner plane with apical and basal horn-like appendages, medianly 1-septate.</p> <p> <b>Etymology:</b> —Referring to its long spores.</p> <p> <b>Habitat:</b> —Forest litters.</p> <p> <b>Known Distribution:</b> —Greater Hinggan mountains, Heilongjiang province, China.</p> <p> <b>Additional isolates examined:</b> — CHINA, Heilongjiang province, Maoershan, leaves (<i>Populus davidiana</i>, <i>Betula platyphylla</i>) litter and soil, September 2018, Siyu Gao SGSF411, <i>ibid.</i> SGSF573.</p> <p> <b>Notes:</b> — <i>Arxiella longispora</i> is distinct from three asexual morphs in <i>Arxiella</i>, <i>A. dolichandrae</i>, <i>A. lunata</i>, and <i>A. terrestris</i>, by having longer conidia (up to 24 μm long) with a larger length-to-width ratio (>5) (TABLE 2). The closest taxa of <i>A. longispora</i> is <i>A. terrestris</i> based on the similarity of different DNA sequences. The ITS, <i>rpb2</i> and <i>tef1</i> sequences of <i>A. longispora</i> showed 97.73%, 94.42%, and 98.61% similarity to <i>A. terrestris</i>, respectively (TABLE S2). Morphologically, <i>A. longispora</i> is closer to <i>A. terrestris</i> and <i>A. dolichandrae</i> due to shape of the conidia which have a straight inner side. In comparison, <i>A. lunata</i> has conidia with a curved inner side. The black-brown colonies of <i>A. longispora</i> on PDA was different with <i>A. terrestris</i>, which shows black-green colonies on PDA. In addition, <i>A. longispora</i> produces unique conidia as mentioned above, but <i>A</i>. <i>celtidis</i> as the only sexual morph do not produce any asexual morph in the culture.</p>Published as part of <i>Xu, Yue, Du, Tingting, Liu, Yao, Qiu, Tianyi, Gao, Siyu, Meng, Wei & Xu, Lijian, 2023, Arxiella longispora (Muyocopronaceae), a new fungal species from forest litters in Northeast China, pp. 160-168 in Phytotaxa 616 (2)</i> on pages 164-166, DOI: 10.11646/phytotaxa.616.2.5, <a href="http://zenodo.org/record/8389607">http://zenodo.org/record/8389607</a>
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