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2920篇 您的检索式:作者名="Menges M"
    题名 作者 年代 出处 被引量
1青海共和盆地达连海湖泊流域表土花粉-气候响应面分析显示文摘孢粉分析是研究过去全球变化的一种重要方法,而研究花粉与现代气候之间的相互关系是古气候定量重建研究中的前沿课题。要预测未来气候的中长期变化,必须从花粉记录中定量提取古气候信息,建立的多种孢粉-气候数学模型必须经过不同边界条件下的古气候数据检验校正才能应用到实际当中。花粉-气候响应面方法是考虑了花粉与气候间的非线形关系上,提出的将现代花粉丰度在地理空间的分布转换为气候空间的分布,并以提供定量的古气候数据,已被广泛应用于COHMAP等各种重要古气候研究项目。本文就是利用该方法,以青藏高原东北部共和盆地达连海湖泊流域54个表土样品中的花粉丰度及采样点的气候参数为基础数据,通过主成分分析选择了特征值高且指示意义明显的4种花粉类型,对其丰度与7月平均温度及年平均降水量两个气候参数进行多项式回归分析,其结果显示模型对数据拟合较好,为定量重建该区古气候变化提出了较为准确的数量指标。陈英玉 QING Hai-ruo VELEZ M I LIU Meng 魏豆豆 蔡遥 2014地球学报2014,35,1:10
2Clopidogrel with aspirin in High- risk patients with Acute Non- disabling Cerebrovascular Events II (CHANCE-2): rationale and design of a multicentre randomised trial显示文摘Background In patients with a minor ischaemic stroke or transient ischaemic attack(TIA),separate trials have shown that dual antiplatelet therapy with clopidogrel plus aspirin(clopidogrel-aspirin)or ticagrelor plus aspirin(ticagrelor-aspirin)are more effective than aspirin alone in stroke secondary prevention.However,these two sets of combination have not been directly compared.Since clopidogrel was less effective in stroke patients who were CYP2C19 loss-of function(LOF)allele carriers,whether ticagrelor-aspirin is clinically superior to clopidogrel-aspirin in this subgroup of patients with stroke is unclear.Aim To describe the rationale and design considerations of the Clopidogrel in High-risk patients with Acute Non-disabling Cerebrovascular Events(CHANCE-2)trial.Design CHANCE-2 is a randomised,double-blind,double-dummy,placebo-controlled,multicentre trial that compares two dual antiplatelet strategies for minor stroke or TIA patients who are CYP2C19 LOF allele carriers:ticagrelor(180 mg loading dose on day 1 followed by 90 mg twice daily on days 2-90)or clopidogrel(300 mg loading dose on day 1 followed by 75 mg daily on days 2-90),plus open-label aspirin with a dose of 75-300 mg on day 1 followed by 75 mg daily on day 2-21.All will be followed for 1 year.Study outcomes The primary efficacy outcome is any stroke(ischaemic or haemorrhagic)within 3 months and the primary safety outcome is any severe or moderate bleeding event within 3 months.Discussion The CHANCE-2 trial will evaluate whether ticagrelor-aspirin is superior to clopidogrel-aspirin for minor stroke or TIA patients who are CYP2C19 LOF allele carriers.Yongjun Wang Claiborne Johnston Philip M Bath Xia Meng Jing Jing Xuewei Xie Anxin Wang Yuesong Pan Anding Xu Qiang Dong Yilong Wang Xingquan Zhao Zixiao Li Hao Li 2021Stroke & Vascular Neurology2021,6,2:10
3Hepatocellular carcinoma-specific immunotherapy with synthesized α1,3-galactosyl epitope-pulsed dendritic cells and cytokine-induced killer cells显示文摘AIM: To evaluate the safety and clinical efficacy of a new immunotherapy using both α-Gal epitope-pulsed dendritic cells (DCs) and cytokine-induced killer cells.METHODS: Freshly collected hepatocellular carcinoma(HCC) tumor tissues were incubated with a mixture of neuraminidase and recombinant α1,3-galactosyltransferase (α1,3GT) to synthesize α-Gal epitopes on carbohydrate chains of the glycoproteins of tumor membranes. The subsequent incubation of the processed membranes in the presence of human natural anti-Gal IgG resulted in the effective phagocytosis to the tumor membrane by DCs. Eighteen patients aged 38-78 years with stage Ⅲ primary HCC were randomLy chosen for the study; 9 patients served as controls, and 9 patients were enrolled in the study group.RESULTS: The evaluation demonstrated that the procedure was safe; no serious side effects or autoimmune diseases were observed. The therapy significantly prolonged the survival of treated patients as compared with the controls (17.1 ± 2.01 mo vs 10.1 ± 4.5 mo,P = 0.00121). After treatment, all patients in the study group had positive delayed hyper sensitivity and robust systemic cytotoxicity in response to tumor lysate as measured by interferon-γ-expression in peripheral blood mononuclear cells using enzyme-linked immunosorbent spot assay. They also displayed increased numbers of CD8-, CD45RO-and CD56-positive cells in the peripheral blood and decreased α-fetoprotein level in the serum.CONCLUSION: This new tumor-specific immunotherapy is safe, effective and has a great potential for the treatment of tumors.Ying Qiu Ming-Bao Xu Mark M Yun Yi-Zhong Wang Rui-Ming Zhang Xing-Kai Meng Xiao-Hui Ou-Yang Sheng Yun 2011World Journal of Gastroenterology2011,17,48:8
4Selective conversion of syngas to propane over ZnCrO_x-SSZ-39 OX-ZEO catalysts显示文摘Oxide-Zeolite(OX-ZEO) bifunctional catalyst design concept has been exemplified in several processes to direct conversion syngas to value-added chemicals and fuels such as mixed light olefins, ethylene, aromatics and gasoline.Herein we demonstrate that the product can be steered toward liquefied petroleum gas(LPG) with a selectivity up to 89% in hydrocarbons especially propane selectivity reaching 80% at CO conversion of 63% using ZnCrOx-H-SSZ-39 catalyst.Interestingly, the quantity of the acid sites of SSZ-39 does not influence obviously the hydrocarbon distribution but the strength is crucial for selective formation of propane.This finding provides an alternative route of LPG synthesis from a variety of carbon resources via syngas.Gen Li Feng Jiao Dengyun Miao Yong Wang Xiulian Pan Toshiyuki Yokoi Xiangju Meng Feng-Shou Xiao Andrei-Nicolae Parvulescu Ulrich Müller Xinhe Bao 2019Journal of Energy Chemistry2019,28,9:6
5It is safe to use transdermal glyceryl trinitrate to lower blood pressure in patients with acute ischaemic stroke with carotid stenosis显示文摘Background There is concern that blood pressure(BP)lowering in acute stroke may compromise cerebral perfusion and worsen outcome in the presence of carotid stenosis.We assessed the effect of glyceryl trinitrate(GTN)in patients with carotid stenosis using data from the Efficacy of Nitric Oxide in Stroke(ENOS)Trial.Methods ENOS randomised 4011 patients with acute stroke and raised systolic BP(140-220 mm Hg)to transdermal GTN or no GTN within 48 hours of onset.Those on prestroke antihypertensives were also randomised to stop or continue their medication for 7 days.The primary outcome was the modified Rankin Scale(mRS)at day 90.Ipsilateral carotid stenosis was split:<30%;30-<50%;50-<70%;≥70%.Data are ORs with 95%CIs adjusted for baseline prognostic factors.results 2023(60.5%)ischaemic stroke participants had carotid imaging.As compared with<30%,≥70%ipsilateral stenosis was associated with an unfavourable shift in mRS(worse outcome)at 90 days(OR 1.88,95%CI 1.44 to 2.44,p<0.001).Those with≥70%stenosis who received GTN versus no GTN had a favourable shift in mRS(OR 0.56,95%CI 0.34 to 0.93,p=0.024).In those with 50-<70%stenosis,continuing versus stopping prestroke antihypertensives was associated with worse disability,mood,quality of life and cognition at 90 days.Clinical outcomes did not differ across bilateral stenosis groups.Conclusions Following ischaemic stroke,severe ipsilateral carotid stenosis is associated with worse functional outcome at 90 days.GTN appears safe in ipsilateral or bilateral carotid stenosis,and might improve outcome in severe ipsilateral carotid stenosis.Jason P Appleton Lisa J Woodhouse Andrew Belcher Daniel Bereczki Eivind Berge Valeria Caso Hui Meng Chang Hanne K Christensen Ronan Collins John Gommans Ann C Laska George Ntaios Serefnur Ozturk Gillian M Sare Szabolcs Szatmari Yongjun Wang Joanna M Wardlaw Nikola Sprigg Philip M Bath for the ENOS investigators 2019Stroke & Vascular Neurology2019,4,1:6
6Classification of gastric neuroendocrine tumors and its clinicopathologic significance显示文摘ClassificationofgastricneuroendocrinetumorsanditsclinicopathologicsignificanceYUJiYao1,WANGLuPing2,MENGYuHong1,HUMeng1,WA...Yu, JY Wang, LP Meng, YH Hu, M Wang, JL Bordi, C 1998World Journal of Gastroenterology1998,4,2:5
7Isolation and Expression Analysis of Two Genes Encoding Cinnamate 4-Hydroxylase from Cotton(Gossypium hirsutum)显示文摘Two genes(GhC4H1 and GhC4H2) that encode putative cotton cinnamate 4-hydroxylases that catalyze the second step in the phenylpropanoid pathway were isolated from developing cotton fibers. GhC4H1 and GhC4H2 each contain open reading frames of 1 518 base pairs(bp) in length and both encode proteins consisting of 505 amino acid residues. They are 90.89% identical to each other at the amino acid sequence level and belong to class I of plant C4 Hs. GhC4H1 and GhC4H2 genomic DNA are 2 247 and 2 161 bp long, respectively, and contain two introns located at conserved positions relative to the coding sequence. GhC4H1 and GhC4H2 promoters were isolated and found to contain many cis-elements(boxes P, L and AC-I element) previously identified in the promoters of other phenylpropanoid pathway genes. Histochemical staining showed GUS expression driven by the GhC4H1 and GhC4H2 promoters in ovules and fibers tissues. GhC4H1 and GhC4H2 were also widely expressed in other cotton tissues. GhC4H2 expression reached its highest level during the elongation stage of fiber development, whereas GhC4H1 expression increased during the secondary wall development period in cotton fibers. Our results contribute to a better understanding of the biochemical role of GhC4H1 and GhC4H2 in cotton fiber development.NI Zhi-yong LI Bo Neumann M Peter Lü Meng FAN Ling 2014Journal of Integrative Agriculture2014,13,10:3
8缺血性脑卒中后的中期血压变异性与临床结局的关系显示文摘本研究旨在探讨急性脑卒中患者发病7d内的中期血压变异性(blood pressure variability,BPV)与预后的关系。方法:本研究纳入873例急性缺血性脑卒中患者。通过计算发病7d内的收缩压和舒张压的变异系数来评价中期BPV。Wang Y Wang J Meng P Liu N Ji N Zhang G Xu B Zhou X Sun Y Xu Y Hui R He M 陈云 叶鹏 2018中华高血压杂志2018,26,5:2
9深部地球条件下铁和氧元素的化学变化显示文摘氧与铁分别为地球上丰度最高的元素与占地球质量最大的元素,它们所形成的化合物遍布我们的星球,具有-2价的氧控制着地球的氧逸度,随着深度的增加氧逸度逐渐降低,与铁所形成的氧化物中铁的价态也逐渐降低,O/Fe逐渐增加,近些年来科学家们发现深部地球条件下铁的一系列氧化物,其中具有高压黄铁矿结构的铁超氧化物FeO2具有最高的O/Fe,并且它还能够携带一定量的H(表示为Py-FeO2H,, x=0-1)。夏群科 Liu J Hu Q Y Bi W L Yang L X Xiao Y M Chow P Meng Y.Prakapenka V B Mao H K Mao W L 2019矿物岩石地球化学通报2019,38,3:2
10A SAXS study on microstructural change in Al-Zn-Mg alloy during retrogression and reaging 显示文摘Meng Z F Wang Y M 1990Scripta Metall1990,24,7:2
11Petrological and Geochemical Constraints on the Protoliths of Serpentine-Magnetite Ores in the Zhaoanzhuang Iron Deposit,Southern North China Craton显示文摘The uncommon Mg-rich and Ti-poor Zhaoanzhuang serpentine-magnetite ores within Taihua Group of the North China Craton(NCC) remain unclear whether the protolith was sourced from ultramafic rocks or chemical sedimentary sequences. Here we present integrated petrographic and geochemical studies to characterize the protoliths and to gain insights on the ore-forming processes. Iron ores mainly contain low-Ti magnetite(TiO_2 ~0.1 wt%) and serpentine(Mg#=92.42–96.55), as well as residual olivine(Fo=89–90), orthopyroxene(En=89–90) and hornblende. Magnetite in the iron ores shows lower Al, Sc, Ti, Cr, Zn relative to that from ultramafic Fe-Ti-V iron ores, but similar to that from metamorphic chemical sedimentary iron deposit. In addition, interstitial minerals of dolomite, calcite, apatite and anhydrite are intergrown with magnetite and serpentine, revealing they were metamorphic, but not magmatic or late hydrothermal minerals. Wall rocks principally contain magnesian silicates of olivine(Fo=83–87), orthopyroxene(En=82–86), humite(Mg#=82–84) and hornblende [XMg=0.87–0.96]. Dolomite, apatite and anhydrite together with minor magnetite, thorianite(Th-rich oxide) and monazite(LREE-rich phosphate) are often seen as relicts or inclusions within magnesian silicates in the wall rocks, revealing that they were primary or earlier metamorphic minerals than magnesian silicates. And olivine exists as subhedral interstitial texture between hornblende, which shows later formation of olivine than hornblende and does not conform with sequence of magmatic crystallization. All these mineralogical features thus bias towards their metamorphic, rather than magmatic origin. The dominant chemical components of the iron ores are SiO_2(4.77–25.23 wt%), Fe_2O_3 T(32.9–80.39 wt%) and MgO(5.72–27.17 wt%) and uniformly, those of the wall rocks are also SiO_2(16.34–48.72 wt%), Mg O(16.71–33.97 wt%) and Fe_2O_3 T(6.98–30.92 wt%). The striking high Fe-Mg-Si contents reveal that protolith of the Zhaoanzhuang iron deposit was more likely to be chemical sedimentary rocks. The distinct high-Mg feature and presence of abundant anhydrite possibly indicate it primarily precipitated in a confined seawater basin under an evaporitic environment. Besides, higher contents of Al, Ti, P, Th, U, Pb, REE relative to other Precambrian iron-rich chemical precipitates(BIF) suggest some clastic terrestrial materials were probably input. As a result, we think the Zhaoanzhuang iron deposit had experienced the initial Fe-Mg-Si marine precipitation, followed by further Mg enrichment through marine evaporated process, subsequent high-grade metamorphism and late-stage hydrothermal fluid modification.MENG Jie LI Houmin LI Lixing SANTOSH M SONG Zhe YANG Xiuqing 2018Acta Geologica Sinica(English Edition)2018,92,2:2
12Calpain activity in the rat brain after transient forebrain ischemia 显示文摘NEUMAR R W MENG F H MILLS A M 2001Exp Neurol2001,170,1:1
13Construction and characterization of a single-chain antibody fragment derived from thymus of a patient with myasthenia gravis 显示文摘Meng F Stassen M H Schillberg S 2002Autoimmunity2002,35,2:1
14Application of CVD nanocrystalline diamond films to cemented carbide drills 显示文摘Meng X M Tang W Z Hei L F 2008Int J Refractory Metals and Hard Mater2008,26,5:1
15Neural network approaches to dynamic collision-free trajectory generation显示文摘Yang S X Meng M 2001IEEE Trans on Systems Man and Cybemetic2001,31,:1
16Cellular levels of TrkB and embryonic rat cortical neurons against hypoxia in vitro显示文摘Meng M Zhiling W Hui Z 2005Int J Dev nearosci2005,23,6:1
17Effective therapy of metastatic ovarian cancer with an oncolytic herpes simplex vinus incorporating two membrane fusion meelumisms显示文摘NAKAMORI M FU X MENG F 2003Clin Can Res2003,9,4:1
18Modeling the capacity and level of service of urban transportation network显示文摘YANG HAI BELL M G H MENG QIANG 2000Transportation Research Part B2000,34,4:1
19Studies on catalytic pyrolysis of heavy oils: reaction behaviors and mechanistic pathways 显示文摘Meng X H Xu C M Gao J S 2005Appl Catal A Gen2005,294,:1
20Weyl's theorem for upper triangular operator matrices显示文摘CAO X H GUO M Z MENG B 2005Linear Algebra and its Applications2005,,402:1
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