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3309篇 您的检索式:作者名="Ivanov"
    题名 作者 年代 出处 被引量
1Fitting into the Harsh Reality: Regulation of Irondeficiency Responses in Dicotyledonous Plants显示文摘铁是一个必要元素因为在地球上的生活和它的缺乏,或过量,在生活,有机体可以导致严重健康混乱。因为饮食的铁和改善庄稼铁内容的主要来源是向更好公共的健康的重要的步,植物服务。我们的评论在使用基于减小的策略以便从根围动员并且进口铁的双子叶的植物和 monocots 集中于铁获得的控制。完成在铁的缺乏和过量之间的平衡要求铁举起系统的活动的一条紧密的规定。很多研究,从单个基因描述到系统生物学分析,在最近的年里在铁举起上导致了我们的知识的快速的扩大。这里,我们从细胞内部的店总结新奇卓见进铁获得和内部动员的规定。我们在场主要已知的规章的网络的一个详细看法由合适的 Arabidopsis 管理者和波沛(PYE ) 定义。另外,我们分析根和叶铁应答的规章的网络,揭示新奇潜在的基因相互作用和可靠铁缺乏标记基因。我们关于察觉到的铁和 translational 以后规定讨论观点和待研究的问题。Rumen Ivanov Tzvetina Brumbarova Petra Bauer 2012Molecular Plant2012,5,1:25
2黄河三角洲整体冲淤平衡及其地质意义显示文摘海岸侵蚀、三角洲面积减小已成为世界上关注的热点问题。三角洲造陆的趋势及速度制约着三角洲地区经济的持续发展和生态环境的演变。本文以 1976、1986、1992、1996~ 1998年黄河三角洲卫星遥感照片及海区水深等实测资料为依据 ,通过其高潮线的对比分析 ,研究整个黄河三角洲面积变化的趋势。结果表明 ,黄河三角洲在整体淤进的同时伴随着蚀退 ,三角洲的造陆面积呈逐渐减小的趋势。通过对 195 0~ 1998年黄河利津站实测来水来沙资料的分析 ,发现近年来水沙呈递减趋势 ,这可能是三角洲造陆面积减小的重要原因。研究了黄河三角洲造陆面积与流域来水来沙的关系 ,从而得出当来沙量为 2 .45亿 t/ a时 ,三角洲面积整体趋于不冲不淤的平衡。若来水来沙量继续减少 ,黄河三角洲将走向全面蚀退 。刘曙光 李从先 丁坚 李希宁 Ivanov V V 2001海洋地质与第四纪地质2001,21,4:25
3Post-liver transplant biliary complications:Current knowledge and therapeutic advances显示文摘Liver transplantation is the current standard of care for end-stage liver disease and an accepted therapeutic option for acute liver failure and primary liver tumors.Despite the remarkable advances in the surgical techniques and immunosuppressive therapy,the postoperative morbidity and mortality still remain high and the leading causes are biliary complications,which affect up to one quarter of recipients.The most common biliary complications are anastomotic and non-anastomotic biliary strictures,leaks,bile duct stones,sludge and casts.Despite the absence of a recommended treatment algorithm many options are available,such as surgery,percutaneous techniques and interventional endoscopy.In the last few years,endoscopic techniques have widely replaced the more aggressive percutaneous and surgical approaches.Endoscopic retrograde cholangiography is the preferred technique when duct-to-duct anastomosis has been performed.Recently,new devices and techniques have been developed and this has led to a remarkable increase in the success rate of minimally invasive procedures.Understanding the mechanisms of biliary complications helps in their early recognition which is the prerequisite for successful treatment.Aggressive endoscopic therapy is essential for the reduction of morbidity and mortality in these cases.This article focuses on the common post-transplant biliary complications and the available interventional treatment modalities.Irina Boeva Petko Ivanov Karagyozov Ivan Tishkov 2021World Journal of Hepatology2021,13,1:11
4水泥-生石灰固化吹填土路用特性试验研究显示文摘为探讨不同配比水泥、生石灰双掺固化吹填土的路用特性,实现经济、高效之目的,开展了温州吹填软土的土体固化改良系列试验(击实试验、无侧限抗压强度试验、CBR试验)研究。研究表明:随着固化剂剂量的增加,试样的最优含水率逐渐增加,而最大干密度则逐渐降低,但强度随水泥、生石灰相对含量的变化出现不同规律改变;试样无侧限抗压强度、CBR值显著依赖于固化剂中水泥、生石灰相对含量,当水泥、生石灰为等量比值时,两者均随固化剂掺量的增加而增大,当水泥、生石灰为非等量比值时,两者均出现不同规律改变。利用模糊数学评价法,综合考虑无侧限抗压强度、CBR值以及经济性等因素的影响,对固化后的路用效果进行评价,并得出一种路用性能好、经济性高的固化剂最佳配合比。李海龙 刘科 沈扬 Volodymyr Ivanov 2014水利与建筑工程学报2014,12,2:11
5Use of Sorghum Crops for in Situ Phytoremediation of Polluted Soils显示文摘V. R. Angelova R. V. Ivanova V. A. Delibaltova K. I. Ivanov 2011Journal of Agricultural Science and Technology(A)2011,1,5:10
6Phenotypic differences between coryneform bacteria isolated from seminal fluid of healthy men and men with chronic prostatitis syndrome显示文摘我们比较了与长期的前列腺炎症候群(每秒字符数) 联系的棒状细菌细菌的潜在的 phenotypic 性质,例如溶解酵素(SIL ) 的能分泌的禁止者和血小板 microbicidal 蛋白质(SIPMP ) 的能分泌的禁止者。一个总数 110 临床棒状细菌孤立与每秒字符数从健康的人和人的精液孤立的细菌被测试。SIPMP 生产被禁止血小板 microbicidal 测试对杆菌 subtilis 的蛋白质(PMP ) bioactivity,并且被表示为 PMP 的抑制的百分比杀菌活动。SIL 生产被对小球菌 lysodeikticus 禁止溶解酵素活动测试并且每使失去活性的溶解酵素的毫升在 microgram 被表示。每秒字符数紧张(58.7% 对 19.2 %) 的一个显著地更高的比例与非每秒字符数紧张相比是 SIPMP 积极的(P < 0.01 ) 。测试的 CPS 紧张, 77.8% 与 34% 非每秒字符数相比是 SIL 积极的孤立(P < 0.05 ) 。这些结果建议例如,每秒字符数的诊断不应该完全依靠古典参数鉴定并且微生物,而是这些参数的功能的意义数必须被估计,可能由不同细菌的 substrains 的集中,有病原的性质的机会主义的微生物的察觉,例如到 cationic 抗菌剂的显著抵抗,禁止抗菌剂的肽,或能力招待防卫因素。Iuri B Ivanov Viktor A Gritsenko Michael D Kuzmin 2009Asian Journal of Andrology2009,11,4:6
7部分重力条件下气液两相流型研究显示文摘本文分析了“和平号”空间站气液两相流实验中获得的部分重力(0.1g和0.014g)条件下的流型特征及其相互转换条件,并将其和常重力与微重力两相流研究中较常用的流型转换模型的预测结果进行了比较。赵建福 解京昌 林海 胡文瑞 A V Ivanov A Yu Belyaev 2004工程热物理学报2004,25,1:6
8Single-cell profiling reveals the trajectories of natural killer cell differentiation in bone marrow and a stress signature induced by acute myeloid leukemia显示文摘Natural killer(NK)cells are innate cytotoxic lymphoid cells(ILCs)involved in the killing of infected and tumor cells.Among human and mouse NK cells from the spleen and blood,we previously identified by single-cell RNA sequencing(scRNAseq)two similar major subsets,NK1 and NK2.Using the same technology,we report here the identification,by single-cell RNA sequencing(scRNAseq),of three NK cell subpopulations in human bone marrow.Pseudotime analysis identified a subset of resident CD56^(bright) NK cells,NK0 cells,as the precursor of both circulating CD56dim NK1-like NK cells and CD56^(bright) NK2-like NK cells in human bone marrow and spleen under physiological conditions.Transcriptomic profiles of bone marrow NK cells from patients with acute myeloid leukemia(AML)exhibited stress-induced repression of NK cell effector functions,highlighting the profound impact of this disease on NK cell heterogeneity.Bone marrow NK cells from AML patients exhibited reduced levels of CD160,but the CD160high group had a significantly higher survival rate.Adeline Crinier Pierre-Yves Dumas Bertrand Escalière Christelle Piperoglou Laurine Gil Arnaud Villacreces Frédéric Vély Zoran Ivanovic Pierre Milpied Émilie Narni-Mancinelli Éric Vivier 2021Cellular & Molecular Immunology2021,18,5:5
9具有鲨鱼皮微观结构表面的铝合金件的铸造及应用显示文摘介绍一种生产尺寸达到1μm的三维功能表面的近净形铸件的精密铸造技术。通常,在金属表面形成功能微观结构的方法是激光烧蚀、电火花加工或者微铣削,但这些方法的生产效率低。采用精密铸造工艺来提高效率的方法,从具有激光微观结构的母模复制微观表面,主要研究精密铸造每一个步骤的造型精度。文中对AlSi7Mg0.3合金给出了蜡模制作,陶瓷型和型芯材料的适应性以及型壳的落砂性的实际结果。以赛车汽油发动机进气歧管为例,形成的鲨鱼皮形内表面可以减少进气阻力。进气歧管由具有规定内径的空气节流器组成,节流器内表面具有鲨鱼皮式沟槽结构,为此,内孔铸造后不能再进行钻加工,要求铸件精度非常高。介绍了具有精确微观结构铸件的制造和脱模技术,还考察了宏观铸件不同制型阶段的收缩特性以及微观沟槽结构。Todor Ivanov Andreas Buhrig-Polaczek Uwe Vroomen 刘金城(翻译) 2011铸造2011,60,3:5
10Structure-activity relationship in water-gas shift reaction over gold catalysts supported on Y-doped ceria显示文摘The utilization of pure hydrogen as an energy source in fuel cells gave rise to renewed interest in developing active and stable water-gas shift catalysts. Gold catalysts have proven to be very efficient for water-gas shift reaction at low temperature. The aim of the present study was to investigate the effect of:(i) different preparation methods(impregnation and coprecipitation) to obtain a modified ceria support,and(ii) the amount of Y_2 O_3(1.0 wt%, 2.5 wt%, 5.0 wt% and 7.5 wt%) as dopant on the water-gas shift activity of Au/CeO_2 catalysts. An extended characterization by means of S_(BET), XRD, HRTEM/HAADF, FTIR,H_2-TPR and CO-TPR measurements in combination with careful evaluation of the catalyst behavior allowed to shed light on the parameters governing the water-gas shift activity. The catalysts show very high activity(>90% CO conversion) in the temperature range 180-220 ℃,with a slightly better performance of the gold catalysts on supports prepared by impregnation. The decreased activity with increasing Y_2 O_3 concentration is related to the hindering of oxygen mobility due to ordering of surface oxygen vacancies in vicinity of segregated Y^(3+). The effect of catalyst pre-treatments and the stability of the best performing samples were examined as well.Tatyana Tabakova Lyuba Ilieva Ivan Ivanov Maela Manzoli Rodolfo Zanella Petya Petrova Zbigniew Kaszkur 2019Journal of Rare Earths2019,37,4:4
11Argo floats revealing bimodality of large-scale mid-depth circulation in the North Atlantic显示文摘Analysis of Argo float trajectories at 1 000 m and temperature at 950 m in the North Atlantic between November 2003 and January 2005 demonstrates the existence of two different circulation modes with fast transition between them. Each mode has a pair of cyclonic-anticyclonic gyres. The difference is the location of the cyclonic gyre. The cyclonic gyre stretches from southeast to northwest in the first mode and from the southwest to the northeast in the second mode. The observed modes strongly affect the heat and salt transport in the North Atlantic. In particular, the second mode slows down the westward transport of the warm and saline water from the Mediterranean Sea.CHU Peter C IVANOV Leonid M MELNICHENKO Oleg V LI Rongfeng 2008Acta Oceanologica Sinica2008,27,2:4
12放电脉冲重频准分子激光器在不同应用领域的发展现状(英文)显示文摘研究了脉冲宽度为25~40 ns的放电脉冲XeCl准分子激光器的工作参数。结果显示,激光器产生的脉冲能量为0.2~0.7 J,重复频率为100 Hz,表明在泵浦功率为2.8~3.3 MW/cm3时,激光器实现了2.6%的激光效率和3.8%的本征效率。LOSEV V F PANCHENKO Yu N DUDAREV V V IVANOV N G KONOVALOV I N PAVLINSKY A V PUCHIKIN A V 2011中国光学2011,4,1:3
13Hematopoietic stem cells in research and clinical applications:The“CD34 issue”显示文摘In this paper,experimental findings concerning the kinetics of hematopoietic reconstitution are compared to corresponding clinical data.Although not clearly apparent,the transplantation practice seems to confirm the basic proposals of experimental hematology concerning hematopoietic reconstitution resulting from successive waves of repopulation stemming from different subpopulations of progenitor and stem cells.One of the 'f irst rate' parameters in clinical transplantations in hematology;i.e.the CD34+ positive cell dose,has been discussed with respect to the functional heterogeneity and variability of cell populations endowed by expression of CD34.This parameter is useful only if the relative proportion of stem and progenitor cells in the CD34+ cell population is more or less maintained in a series of patients or donors.This proportion could vary with respect to the source,pathology,treatment,processing procedure,the graft ex vivo treatment and so on.Therefore,a universal dose of CD34+ cells cannot be def ined.In addition,to avoid further confusion,the CD34+ cells should not be named 'stem cells' or 'progenitor cells' since these denominations only concern functionally characterized cell entities.Zoran Ivanovic 2010World Journal of Stem Cells2010,2,2:3
14The Orphan Nuclear Receptor RORγt Directs the Differentiation Program of Proinflammatory IL-17 + T Helper Cells显示文摘Ivaylo I. Ivanov Brent S. McKenzie Liang Zhou Carlos E. Tadokoro Alice Lepelley Juan J. Lafaille Daniel J. Cua Dan R. Littman 2006Cell2006,,6:3
15Induction of Intestinal Th17 Cells by Segmented Filamentous Bacteria显示文摘Ivaylo I. Ivanov Koji Atarashi Nicolas Manel Eoin L. Brodie Tatsuichiro Shima Ulas Karaoz Dongguang Wei Katherine C. Goldfarb Clark A. Santee Susan V. Lynch Takeshi Tanoue Akemi Imaoka Kikuji Itoh Kiyoshi Takeda Yoshinori Umesaki Kenya Honda Dan R. Littma 2009Cell2009,,3:3
16High-Frequency Rayleigh-Wave Method显示文摘High-frequency (≥2 Hz) Rayleigh-wave data acquired with a multichannel recording system have been utilized to determine shear (S)-wave velocities in near-surface geophysics since the early 1980s. This overview article discusses the main research results of high-frequency surface-wave techniques achieved by research groups at the Kansas Geological Survey and China University of Geosciences in the last 15 years. The multichannel analysis of surface wave (MASW) method is a non-invasive acoustic approach to estimate near-surface S-wave velocity. The differences between MASW results and direct borehole measurements are approximately 15% or less and random. Studies show that simultaneous inversion with higher modes and the fundamental mode can increase model resolution and an investigation depth. The other important seismic property, quality factor (Q), can also be estimated with the MASW method by inverting attenuation coefficients of Rayleigh waves. An inverted model (S-wave velocity or Q) obtained using a damped least-squares method can be assessed by an optimal damping vector in a vicinity of the inverted model determined by an objective function, which is the trace of a weighted sum of model-resolution and model-covariance matrices. Current developments include modeling high-frequency Rayleigh-waves in near-surface media, which builds a foundation for shallow seismic or Rayleigh-wave inversion in the time-offset domain; imaging dispersive energy with high resolution in the frequency-velocity domain and possibly with data in an arbitrary acquisition geometry, which opens a door for 3D surface-wave techniques; and successfully separating surface-wave modes, which provides a valuable tool to perform S-wave velocity profiling with high-horizontal resolution.Richard D Miller 徐义贤 罗银河 陈超 刘江平 Julian Ivanov 2009Journal of China University of Geosciences2009,20,3:2
17RORγ-Expressing Th17 Cells Induce Murine Chronic Intestinal Inflammation via Redundant Effects of IL-17A and IL-17F显示文摘Moritz Leppkes Christoph Becker Ivaylo I. Ivanov Sebastian Hirth Stefan Wirtz Clemens Neufert Sandrine Pouly Andrew J. Murphy David M. Valenzuela George D. Yancopoulos Burkhard Becher Dan R. Littman Markus F. Neurath 2009Gastroenterology2009,,1:2
18足底压力测量鞋垫系统设计及发展趋势显示文摘运用足底压力分布测量系统分析了足底压力特性。对足底压力测量的研究现状进行了概述,总结分析了几种足底压力测量系统的优缺点,指出便携、易操作和对场地有较少要求的智能可穿戴压力鞋垫日益成为研究焦点。从系统架构、传感器要求及鞋垫材料等方面重点对足底压力测量鞋垫的系统设计进行了分析,对足底压力测量鞋垫的研究方向与挑战,以及进一步研究提出了建议。邓喜乐 Kamen Ivanov 梅占勇 邓咏梅 2019纺织科技进展2019,0,11:2
19Peculiarities of ethane oxidation on V2O5/SiO2 catalysts with different silica structure and morphologh显示文摘A V Kucherov A V Ivanov T N Kucherova 2003Catal Today2003,81,:2
20Ozone Decomposition, Benzene and CO oxidation over NiMnO3- ilmenite and NiMn2 O4 - spinel Catalysts 显示文摘D MEHANDJIEV A NAYDENOV G IVANOV 2001Applied Catalysis A2001,206,:2
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