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67篇 您的检索式:作者名="Da Xi"
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1The DTH8-Hd1 Module Mediates Day-Length-Dependent Regulation of Rice Flowering显示文摘Photoperiodic flowering 是最重要的小径之一在米饭(Oryza sativa ) 管理 flowering,在哪个标题日期 1 (Hd1 ) , Arabidopsis CONSTANS 基因的 ortholog,编码一个枢轴的管理者。Hd1 在短天的条件(SD ) 下面支持 flowering,但是镇压在由调整领导日期 3a (Hd3a ) 的表示的长天的条件(LD ) 下面的 flowering,在米饭的 FLOWERING 地点 T (英尺) ortholog。然而, Hd1 怎么响应天长度改变它的规章的活动的分子的机制仍然保持大部分未知。在这研究,我们证明在由 Hd1 的 LD 的 flowering 的压抑依赖于到领导 8 的抄写因素天(DTH8 ) 。DTH8 功能的损失由 Hd1 导致 Hd3a 的激活,导致早 flowering。我们发现 Hd1 直接与 DTH8 交往并且 DTH8-Hd1 建筑群的形成为由在 LD 的 Hd1 的 Hd3a 的 transcriptional 压抑是必要的,含有 Hd1 功能的开关被 DTH8 在 LD 而非在 SD 调停。而且,我们表明 DTH8 与 Hd3a 倡导者联系在 Hd3a 地点调制 H3K27 trimethylation (H3K27me3 ) 的水平。面对 DTH8-Hd1 建筑群, H3K27me3 水平在 Hd3a 被增加,而 DTH8 功能的损失在 Hd3a 导致了减少的 H3K27me3 水平。一起拿,我们的调查结果显示响应天长度, DTH8 在调停起一个关键作用 ? 由通过到在 photoperiodic flowering 的形状 epigenetic 修正的 DTH8-Hd1 模块的 Hd1 的 Hd3a 的 transcriptional 规定。Anping Dul Wei Tian Menghao Wei Wei Yan Hang He Da Zhou Xi Huang Shigui Li Xinhao Ouyang 2017Molecular Plant2017,10,7:21
2Carbon and sulfur isotopic compositions of basal Datangpo Formation, northeastern Guizhou, South China:Implications for depositional environment显示文摘Isotopic compositions of Mn-carbonate and organic carbon from the same individual samples and sulfur isotopic compositions of pyrites in the basal Datangpo Formation were analyzed. Highly 34S-enriched pyrites (d34Spyrite=31.7-59.4‰) were precipitated in rel- atively occlusive pore water under anoxic condition in sediments, which is consistent with the observation of large and scattered pyrite framboids. The sulfidic deep ocean was not 'oxidized' in the early Datangpo interglacial interval, thus the level of seawater sulfate remained low and marine d34Ssulphate remained high. Low d13Ccar (average 7.4‰) and abnormal relationship between d13Ccar and frac-tionation (Dcar-org) imply that the negative d13Ccar excursion may have resulted from oxidation of part of a large organic carbon reser-voir. High Dcar-org (average 25.1‰) implicates high CO2 level in the atmosphere. Small standard deviation (1.0‰) of d13Ccar values indicates the Mn-carbonate was precipitated near the water-sediment interface under dysoxic conditions rather than in occlusive pore water in sediments.Xi Chen Da Li Hong-Fei Ling Shao-Yong Jiang 2008Progress in Natural Science:Materials International2008,18,4:15
3Type Synthesis of Walking Robot Legs显示文摘Walking robots use leg structures to overcome obstacles or move on complicated terrains. Most robots of current researches are equipped with legs of simple structure. The specific design method of walking robot legs is seldom studied. Based on the generalized-function(GF) set theory, a systematic type synthesis process of designing robot legs is introduced. The specific mobility of robot legs is analyzed to obtain two main leg types as the goal of design.Number synthesis problem is decomposed into two stages, actuation and constraint synthesis by name,corresponding to the combinatorics results of linear Diophantine equations. Additional restrictions are discussed to narrow the search range to propose practical limb expressions and kinematic-pair designs. Finally, all the fifty-one leg structures of four subtypes are carried out, some of which are chosen to make up robot prototypes, demonstrating the validity of the method. This paper proposed a novel type synthesis methodology, which could be used to systematically design various practical robot legs and the derived robots.Da Xi Feng Gao 2018Chinese Journal of Mechanical Engineering2018,31,1:8
4Mechanism of exogenous nucleic acids and their precursors improving the repair of intestinal epithelium after 7-irradiation in mice显示文摘AIM To clone expressed genes associated withrepair of irradiation-damaged mice intestinalgland cells treated by small intestinal RNA,andto explore the molecular mechanism ofexogenous nucleic acids improving repair ofintestinal crypt.METHODS The animal mode of test group andcontrol group was established,forty-five micebeing irradiated by γ ray were treated with smallintestinal RNA as test group,forty mice beingirradiated by γ ray were treated withphysiological saline as control group,five micewithout irradiation were used as normal control,their jejunal specimens were collectedrespectively at 6h,12h,24h,4d and 8d afterirradiation.Then by using LD-PCR based onsubtractive hybridization,these gene fragmentsdifferentially expressed between test group andcontrol group were obtained,and then werecloned into T vectors as well as beingsequenced.Obtained sequences were screenedagainst.GeneBank,if being new sequences,they were submitted to GeneBank.RESULTS Ninety clones were associated withrepair of irradiation-damaged intestinal glandcells treated by intestinal RNA.These clonesfrom test group of 6h,12h,24h,4d and 8dwere respectively 18,22,25,13,12.By screening against GeneBank,18 of which werenew sequences,the others were dramaticallysimilar to the known sequences,mainly similarto hsp,Nmi,Dutt1,alkaline phosphatase,homeobox,anti-CEA ScFv antibody,arginine/serine kinase and BMP-4,repA.Eighteen genefragments were new sequences,their acceptnumbers in GeneBank were respectivelyAF240164-AF240181.CONCLUSION Ninety clones were obtained tobe associated with repair of irradiation-damagedmice intestinal gland cells treated by smallintestinal RNA,which may be related toabnormal expression of genes and matchedproteins of hsp,Nmi,Duttl,Na,K-ATPase,alkalineph-osphatase,glkA,single strandedreplicative centromeric gene as well as 18 newsequences.Da Xiang Cui~1 Guei Ying Zeng~2 Feng Wang~1 Jun Rong Xu~1 Dong Qing Ren~2 Yan Hai Guo~1 Fu Rong Tian~2 Xiao Jun Yan~1 Yu Hou~1 Cheng Zhi Su~1 1 Institute of Genetic Diagnosis of the Fourth Military Medical University,Xi’an 710032,China 2 Department of Irradiation Medicine of the Fourth Military Medical University,Xi’an 710032,China 2000World Journal of Gastroenterology2000,6,5:8
5Zika virus infection induces RNAi-mediated antiviral immunity in human neural progenitors and brain organoids显示文摘The re-emergence of Zika virus(ZIKV)in the Western Hemisphere has resulted in global public health crisis since 2015.ZIKV preferentially infects and targets human neural progenitor cells(hNPCs)and causes fetal microcephaly upon maternal infection.hNPCs not only play critical roles during fetal brain development,but also persist in adult brain throughout life.Yet the mechanism of innate antiviral immunity in hNPCs remains largely unknown.Here,we show that ZIKV infection triggers the abundant production of virus-derived small interfering RNAs in hNPCs,but not in the more differentiated progenies or somatic cells.Ablation of key RNAi machinery components significantly enhances ZIKV replication in hNPCs.Furthermore,enoxacin,a broad-spectrum antibiotic that is known as an RNAi enhancer,exerts potent anti-ZIKV activity in hNPCs and other RNAi-competent cells.Strikingly,enoxacin treatment completely prevents ZIKV infection and circumvents ZIKV-induced microcephalic phenotypes in brain organoid models that recapitulate human fetal brain development.Our findings highlight the physiological importance of RNAi-mediated antiviral immunity during the early stage of human brain development,uncovering a novel strategy to combat human congenital viral infections through enhancing RNAi.Yan-Peng Xu Yang Qiu Boya Zhang Guilai Chen Qi Chen Miao Wang Fan Mo Jiuyue Xu Jin Wu Rong-Rong Zhang Meng-Li Cheng Na-Na Zhang Bao Lyu Wen-Liang Zhu Meng-Hua Wu Qing Ye Da Zhang Jiang-Hong Man Xiao-Feng Li Jie Cui Zhiheng Xu Baoyang Hu Xi Zhou Cheng-Feng Qin 2019Cell Research2019,29,4:8
6Regulatory effects of electro-acupuncture at Zusanfi on ir-SP content in rat pituitary gland and peripheral blood and their immunity显示文摘INTRODUCTIONIt has been reported in many studies that electro-acupuncture(EA)can positively regulate erythrocyticimmunity and T-lymphocytic subgroups.Nevertheless,its mechanism remains to be explored.In thepresent study,a multi-group,multi-stepped and multi-indexed observation was conducted on the effects of EAWei Gao Yu Xin Huang Hong Chen Da Yong Song Qin Li Wang Department of Gastroenterology Medical Affair Office,Tangdu Hospital,4th Military Medical University,Xi’an 710038,Shanxi Province,China Department of Gastroenterology,Chinese PLA General Hospital of Guangzhou Command Area,Guangzhou 510210,Guangdong Province,China 2000World Journal of Gastroenterology2000,6,4:5
7Hydrophobic modification of poly(phthalazinone ether sulfone ketone) hollow fiber membrane for vacuum membrane distillation显示文摘新恐水病(phthalazinone 醚 sulfone 酉同类)(PPESK ) poly,空心丝复合膜被表面涂的修正方法获得。Zhao Jin Da Ling Yang Shou Hai Zhang Xi Gao Jian 2008Chinese Chemical Letters2008,19,3:5
8Defective T wave combined with incomplete right bundle branch block: a new electrocardiographic index for diagnosing atrial septal defect显示文摘WANG Mu-xuan WU Gui-fu GU Jing-li LI Li LU Kun YANG Da CHEN Long ZHANG Xi LUO Fu-tian Andrew D. Michaels MA Hong 2012Chinese Medical Journal2012,,6:4
9Analysis for remedial alternatives of unregulated municipal solid waste landfills leachate-contaminated groundwater显示文摘地下水流动和溶质运输模型为预报沾染物运输并且基于 unregulated 垃圾堆的案例研究估计补救选择的效果用视觉 Modflow 被开发在东方中国的污染 leachate 的地下水。结果证明那根砷羽毛是到达在八年,和砷羽毛的最长侧面、纵的距离以后在下游的农田抽很好是分别地到达 200 m 和 260 m。但是砷羽毛的区域是不显然从八年增加到十年和羽毛的高集中的区域是在 20 年以后传播到下游的河和农田区域;当垃圾堆磨擦了时被变硬,羽毛是不在八年以后到达下游的农田区域;当抽的井下游地在羽毛被安装,分泌物率是 200m ^ 时,啜 3 ^/d,羽毛将有效地被制止;为防漏的障碍,它可能有效地在一个程度时间范围以内保护敏感目标的地下水。要不是连续的点来源,羽毛仍然是防漏的障碍到圆;当排水阴沟的分泌物率是 170.26 m ^ 时,啜 3 ^/d,羽毛有效地被控制;有排水阴沟的联合地面变硬能在控制沾染物散开给最好的效果的全面方法,和分泌物率将被归结为 111.43 m ^ 啜 3 ^/d。因此,当 leachate 漏发生在 unregulated 垃圾堆时,有排水阴沟的全面补救其他的联合地面变硬将为阻止地下水污染被推荐[出版摘要]Da AN Yonghai JIANG Beidou XI Zhifei MA Yu YANG Queping YANG Mingxiao LI Jinbao ZHANG Shunguo BAI Lei JIANG 2013Frontiers of Earth Science2013,7,3:3
10The Marine Redox Change and Nitrogen Cycle in the Early Cryogenian Interglacial Time: Evidence from Nitrogen Isotopes and Mo Contents of the Basal Datangpo Formation, Northeastern Guizhou, South China显示文摘Cryogenian Datangpo Formation was deposited during the interglacial time between the Sturtian and Marinoan ice ages. We studied nitrogen isotope compositions and contents of Mo of the black shales from the basal Datangpo Formation in northeastern Guizhou, South China, for an attempt to reconstruct the marine redox change and nitrogen cycle during the interglacial time. Based on lithostratigraphy as well as geochemical profiles, the basal black shales can be divided into four intervals: Interval 1 has the lowest δ^(15)N value(+5.0‰); in interval 2, δ^(15)N values vary between +6.4‰ and +7.4‰(the first peak); interval 3 records stable values of δ^(15)N around +6‰; and interval 4 is characterized by its higher δ^(15)N values, between +6.7‰ and +7.8‰(the second peak). The values of enrichment factor of Mo decrease from 56.8 to 2.6 with the ascending stratigraphic trend. It indicated that immediately after the Sturtian glaciations, the marine seawater above the transitional zone between the shelf to slope of the southern margin of the Yangtze Platform was stratified, with shallow seawater being oxic but deep water being sulfidic. Subsequently, high denitrification rates prevailed in expanded suboxic areas in spite of a short emergence of an oxic condition in the surface seawater, and the deep seawaters were still anoxic or even euxinic.Wei Wei Dan Wang Da Li Hongfei Ling Xi Chen Guangyi Wei Feifei Zhang Xiangkun Zhu Bin Yan 2016Journal of Earth Science2016,27,2:3
11Synthesis,biological evaluation and SAR studies of benzimidazole derivatives as H_1-antihistamine agents显示文摘一系列 benzimidazole 衍生物为 H1 抗组胺活动被设计了,综合并且评估。六混合物显示出有势力抗组胺 H1 活动。主要 SAR 分析显示本甲基或 benzylidinyl 在 exo 氮原子上代替了, benzimidazole 的 C2 是重要的。进一步的实验显示复合 17d 显示了优秀活动与 astermizole 相比在 hERG 上减少桅杆房间 degranulation,中等 anti-PAF 活动和减少的力量。因此复合的 17d 能为进一步的开发用作反过敏的代理人。Xiao Jian Wang Mei Yang Xi Ji Hua Fu Fu Rong Zhang Gui Fang Cheng Da Li Yin Qi Dong You 2012Chinese Chemical Letters2012,23,6:2
12Removal of 2,4-dichlorophenol from wasterwater by vacuum membrane distillation using hydrophobic PPESK hollow hiber membrane显示文摘2,4-Dichlorophenol 从 waster 水被移开用一新恐水病(phthalazinone 醚 sulfone 酉同类)(PPESK ) poly 凹陷由真空膜蒸馏(VMD ) 的纤维膜。Zhao Jin Da Ling Yang Shou Hai Zhang Xi Gao Jian 2007Chinese Chemical Letters2007,18,12:2
13Development and Evaluation of a Distance Learning System Based on CSCW显示文摘This paper described a distance learning system, which allows Internet users to conduct a lesson in real time from any kinds attached computers. Participants can jointly view and edit relevant multimedia information distributed through Internet. Teachers and students can also simultaneously communicate by voice and text to discuss the problems. Teacher can broadcast streaming PowerPoint presentation in real time to network users. In addition to sliders, presenters can broadcast video and audio simultaneously to deliver a live multimedia show online, and store their presentations for on demand playback. Teachers distributed in different places can also use cooperative editing tool to edit and encode existing digital content. We discussed some important design principles of the system. Then, the system configuration and the results of evaluation are also presented. The system has proved to be applicable to the distance learning based on CSCW (Computer Support Cooperative Work) in Internet.Yin Hao,Zhu Guang\|xi,Li Xiao\|long,Zhu Yao\|ting,He Da\|an Electronic Engineering Department,Huazhong University of Science and Technology , Wuhan 430074,China 2001Wuhan University Journal of Natural Sciences2001,6,Z1:2
14Genomic variation of human papillomavirus type 16 and risk for high grade cervical intraepithelial neoplasia显示文摘XI LF KOUTSKY LA GALLOWAY DA 1997J Natl Cancer Inst1997,89,:1
15Magnetic solid‐phase extraction and ultrafast liquid chromatographic detection of Sudan dyes in red wines, juices, and mature vinegars显示文摘Xi Yu Ying Sun Chun‐Zhu Jiang Yan Gao Yuan‐Peng Wang Han‐Qi Zhang Da‐Qian Song 2012J Sep Science2012,,23:1
16显示文摘Lv Yan Fei Wu Xi Jun Wu Da Xiong 2007Powder Technology2007,173,:1
17On the Monotonicity of the Speed of Random Walks on a Percolation Cluster of Trees显示文摘作者在树的 Bernoulli 契约过滤的无限的簇上考虑简单随机的散步,并且由学习树的三个班调查在简单随机的散步和保留的概率 p 的速度之间的关系。一个足够的条件为 Galton-Watson 树被建立。Da Yue CHEN Fu Xi ZHANG 2007Acta Mathematica Sinica,English Series2007,23,11:1
18The origin and neuronal function of in vivo nonsynaptic glutamate显示文摘Baker DA Xi ZX Shen H Swanson CJ Kalivas PW 2002J Neurosci2002,22,20:1
19Selective stimulation of smaller nerve fibers by single electrode using Biphasic Rectangular Pulses显示文摘Based on the F-H model, a simulation system to study the excitation properties of myelinated nerve fibers was developed. In order to minimize electrochemical damage of nerve tissue, a method was studied to selectively stimulate the smaller nerve fibers by single electrode employing charge-balanced biphasic rectangular pulses, in which an anode pulse with lower amplitude and longer pulse width was added before a cathode pulse with higher amplitude and short pulse width. The simulation results proved that the method is effective in selective stimulation of smaller nerve fibers in a compound nerve trunk in certain conditions. The feasibility of this method was also verified by animal experiments on the sciatic nerve trunks of toads. The amplitude and delay of compound action potential and the results of collision experiments proved that the method is valid. These methods will be very useful in functional neuromuscular stimulation.SHEN Qiang, TAI Chang feng, JIANG Da zongBiomedical Engineering Institute, Xian Jiaotong University, Xian 710049, China 2000Chinese Journal of Biomedical Engineering(English Edition)2000,9,2:1
20Effect of cervical cytology status on the association between human papillomavirus type 16 DNA load and the risk of cervical intraepithelial neoplasia grade 3 显示文摘Xi LF Kiviat NB Galloway DA 2008J Infect Dis2008,198,3:1
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