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153篇 您的检索式:作者名="Zhihong Huang"
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1Multi-objective optimization of a mixed-flow pump impeller using modified NSGA-II algorithm显示文摘In order to maintain a uniform distribution of pareto-front solutions, a modified NSGA-II algorithm coupled with a dynamic crowding distance(DCD) method is proposed for the multi-objective optimization of a mixed-flow pump impeller. With the pump meridional section fixed, ten variables along the shroud and hub are selected to control the blade load by using a three-dimensional inverse design method. Hydraulic efficiency, along with impeller head, is applied as an optimization objective; and a radial basis neural network(RBNN) is adopted to approximate the objective function with 82 training samples. Local sensitivity analysis shows that decision variables have different impacts on the optimization objectives. Instead of randomly selecting one solution to implement, a technique for ordering preferences by similarity to ideal solution(TOPSIS) is introduced to select the best compromise solution(BCS) from pareto-front sets. The proposed method is applied to optimize the baseline model, i.e. a mixed- flow waterjet pump whose specific speed is 508 min?1?m3s?1?m. The performance of the waterjet pump was experimentally tested. Compared with the baseline model, the optimized impeller has a better hydraulic efficiency of 92% as well as a higher impeller head at the design operation point. Furthermore, the off-design performance is improved with a wider highefficiency operation range. After optimization, velocity gradients on the suction surface are smoother and flow separations are eliminated at the blade inlet part. Thus, the authors believe the proposed method is helpful for optimizing the mixed-flow pumps.HUANG RenFang LUO XianWu JI Bin WANG Peng YU An ZHAI ZhiHong ZHOU JiaJian 2015Science China(Technological Sciences)2015,58,12:32
2The effects of probiotics administration on the milk production,milk components and fecal bacteria microbiota of dairy cows显示文摘Probiotics administration can improve host health.This study aims to determine the effects of probiotics(Lactobacillus casei Zhang and Lactobacillus plantarum P-8) administration on milk production,milk functional components,milk composition,and fecal microbiota of dairy cows.Variations in the fecal bacteria microbiota between treatments were assessed based on 16 S rRNA profiles determined by Pac Bio single molecule real-time sequencing technology.The probiotics supplementation significantly increased the milk production and the contents of milk immunoglobulin G(IgG),lactoferrin(LTF),lysozyme(LYS)and lactoperoxidase(LP),while the somatic cell counts(SCC) significantly decreased(P < 0.01).However,no significant difference was found in the milk fat,protein and lactose contents(P > 0.05).Although the probiotics supplementation did not change the fecal bacteria richness and diversity,significantly more rumen fermentative bacteria(Bacteroides,Roseburia,Ruminococcus,Clostridium,Coprococcus and Dorea) and beneficial bacteria(Faecalibacterium prausnitzii) were found in the probiotics treatment group.Meanwhile,some opportunistic pathogens e.g.Bacillus cereus,Cronobacter sakazakii and Alkaliphilus oremlandii,were suppressed.Additionally,we found some correlations between the milk production,milk components and fecal bacteria.To sum up,our study demonstrated the beneficial effects of probiotics application in improving the quality and quantity of cow milk production.Haiyan Xu Weiqiang Huang Qiangchuan Hou Lai-yu Kwok Zhihong Sun Huimin Ma Feiyan Zhao Yuan-Kun Lee Heping Zhang 2017Science Bulletin2017,62,11:21
3Identification of rice cultivars with low brown rice mixed cadmium and lead contents and their interactions with the micronutrients iron,zinc,nickel and manganese显示文摘Paddy fields in mining areas are usually co-contaminated by a cocktail of mixed toxic heavy metals(e.g.,Cd and Pb in Pb/Zn mines).However,previous studies on rice cultivars screened for effective metal exclusion have mostly focused on individual metals,and have been conducted under pot-trial or hydroponic solution conditions.This study identified rice cultivars with both low Cd and Pb accumulation under Cd-and Pb-contaminated field conditions,and the interactions of the toxic elements Cd and Pb with the micronutrient elements Fe,Zn,Mn and Ni were also studied.Among 32 rice cultivars tested,there were significant differences in Cd(0.06-0.59 mg/kg) and Pb(0.25-3.15 mg/kg) levels in their brown rice,and similar results were also found for the micronutrient elements.Significant decreases in concentrations of Fe and Mn were detected with increasing Cd concentrations and a significant elevation in Fe,Mn and Ni with increasing Pb concentrations.A similar result was also shown by Cd and Ni.Three cultivars were identified with a combination of low brown rice Cd and Pb,high micronutrient and grain yield(Wufengyou 2168,Tianyou 196 and Guinongzhan).Present results suggest that it is possible to breed rice cultivars with low mixed toxic element(Cd,Pb) and high micronutrient contents along with high grain yields,thus ensuring food safety and quality.Bing Li Xun Wang Xiaoli Qi Lu Huang Zhihong Ye 2012Journal of Environmental Sciences2012,24,10:18
4MiR-30a Positively Regulates the Inflammatory Response of Microglia in Experimental Autoimmune Encephalomyelitis显示文摘Multiple sclerosis(MS) is a classical inflammatory demyelinating disease of the central nervous system(CNS). Microglia are the main resident immune cells in the CNS and are closely associated with the pathogenesis of MS.In the present study, we found that mi R-30 a was highly expressed in jellyfish-like microglia in chronic active lesions of MS patients, as well as in the microglia of mice with experimental autoimmune encephalomyelitis(EAE) at the chronic phase. In vitro, the conditioned supernatant of mouse microglia overexpressing miR-30 a promoted the apoptosis of oligodendrocyte precursor cells(OPCs), and inhibited OPC differentiation. In vivo, overexpressing miR-30 a in transplanted microglia exacerbated the progression of EAE.Overexpression and knock-down experiments in primary cultured mouse microglia showed that mi R-30 a increased the expression of IL-1 b and i NOS, which are pro-inflammatory, while inhibiting the expression of Ym-1 and CD206.Mechanistically, mi R-30 a inhibited the expression of Ppargc1 b, which is the co-activator of peroxisome proliferator-activated receptor gamma, resulting in pro-inflammatory effects. Our work shows that mi R-30 a is an important regulator of the inflammatory response in microglia, and may be a promising therapeutic target for inflammatory diseases like MS in the CNS.Xue Fang Dingya Sun Zhihong Wang Zhongwang Yu Weili Liu Yingyan Pu Dan Wang Aijun Huang Mingdong Liu Zhenghua Xiang Cheng He Li Cao 2017Neuroscience Bulletin2017,33,6:16
5An ACC Oxidase Gene Essential for Cucumber Carpel Development显示文摘在植物的性决心产生便于 outcrossing 并且提高基因差异的单性的花。在黄瓜和甜瓜,乙烯支持心皮开发并且逮捕雄蕊开发。五性决心基因被识别了,包括四个编码在乙烯生合成催化限制率的步骤的 1-aminocyclopropane-1-carboxylate (ACC ) synthase,和抄写因素基因在甜瓜对应于孟德尔的地点 gynoecious 并且是女性的一个否定管理者的 CmWIP1。ACC oxidase (ACO ) 把 ACC 变换成乙烯;然而,它留下逃犯在黄瓜染色体的基因为性决心是它 ACO 并且怎么批评的 CmWIP1 镇压女花的开发。在这研究,我们在 ACO 基因发现了那个变化, CsACO2,在忍受仅仅男的花的黄瓜授与 androecy。变化破坏 CsACO2 的酶的活动,导致从射击尖端的 50% 更少的乙烯排放。CsACO2 在心皮 primordia 被表示,它的表示为性决心在关键阶段在女花与 CsACS11 的重叠了,大概提供为合适的 CsACS2 要求的足够的乙烯表示。CmACO3, CsACO2 的 ortholog,在心皮区域显示出一个类似的表示模式,建议 CsACO2/CmACO3 的保存功能。我们表明了那 CsWIP1, CmWIP1 的 ortholog,能直接绑 CsACO2 的倡导者并且镇压它的表示。一起拿,我们建议由 WIP1 抄写因素和 ACO 组成的一个大概保存的规章的模块在黄瓜和甜瓜控制单性的花开发。Huiming Chen Jinjing Sun Shuai Li Qingzhi Cui Huimin Zhang Fengjiao Xin Huaisong Wang Tao Lin Dongli Gao Shenhao Wang Xia Li Donghui Wang Zhonghua Zhang Zhihong Xu Sanwen Huang 2016Molecular Plant2016,9,9:16
6Ubi1 intron-mediated enhancement of the expression of Bt cry1Ah gene in transgenic maize (Zea mays L.)显示文摘The cry1Ah gene was one of novel insecticidal genes cloned from Bacillus thuringiensis isolate BT8. Two plant expression vectors containing cry1Ah gene were constructed. The first intron of maize ubiqutin1 gene was inserted between the maize Ubiquitin promoter and cry1Ah gene in one of the plant expressing vectors (pUUOAH). The two vectors were introduced into maize immature embryonic calli by microprojectile bombardment, and the reproductively plants were acquired. PCR and Southern blot analysis showed that foreign genes had been integrated into maize genome and inherited to the next generation stably. The ELISA assay to T1 and T2 generation plants showed that the expression of Cry1Ah protein in the construct containing the ubi1 intron (pUUOAH) was 20% higher than that of the intronless construct (pUOAH). Bioassay results showed that the transgenic maize harboring cry1Ah gene had high resistance to the Asian corn borers and the insecticidal activity of the transgenic maize containing the ubi1 intron was higher than that of the intronless construct. These results indicated that the maize ubi1 intron can enhance the expression of the Bt cry1Ah gene in transgenic maizeWANG YueBing LANG Zhihong ZHANG Jie HE KangLai SONG FuPing HUANG DaFang 2008Chinese Science Bulletin2008,53,20:15
7Dynamics Analysis of the Baiyun Sag in the Pearl River Mouth Basin,North of the South China Sea显示文摘摘要:Baiyun 下垂是在珍珠河嘴盆的斜坡上发展的深的。它水平地作为合成 graben 发生,并且由二亚 sags 对亚 sags 构成低高举。垂直地,沉积建筑学能被划分成三层,即底部,在中间的差错可锻的拉长层和顶上的 draping 层上的指责的层。sag 的主要 rifting 阶段应当被可锻的扩展描绘并且外壳变瘦。特殊变丑模式可能被归因于事实 Baiyun 下垂位于弱地区,使 sag 成为了一个强烈使变形的区域,由极大地变瘦的岩石圈和活跃 magmatism 描绘了的先存在的转移地区。在 Baiyun 下面的高度升起的披风下垂应该是为可锻的变丑负责的重要机制,它引起了上面的披风的部分融化。Upwelling 到上面的外壳和沉积的层,部分融化材料提供了 extensional 紧张并且引起了非指责的垂直沉淀。岩浆在 rifting 的第一个阶段以后在转移地区下面被收集,并且沿着趋势 NW 基础差错在对对 sag 和 upwelled 的 ENE 和 WSW 部分的扩展垂直的一个方向旁边地转了,在的地方趋势 WNW 砍差错在群发展了。指责的活动和 Baiyun 的沉积历史下垂可能被海洋山脉影响了在 24 妈和海地板在 16 妈附近传播的停止附近跳。SUN Zhen ZHONG Zhihong ZHOU Di PANG Xiong HUANG Chunju CHEN Changmin HE Min XU Hehua 2008Acta Geologica Sinica(English Edition)2008,82,1:13
8Effects of root morphology and anatomy on cadmium uptake and translocation in rice(Oryza sativa L.)显示文摘A clear description of the certain mechanisms of cadmium(Cd) uptake and translocation in rice(Oryza sativa L.) may help to reduce Cd accumulation in rice grain. Hydroponic experiments were carried out to determine the effects of cultivation conditions(aerated and stagnant) on the uptake, translocation and subcellular distribution of Cd in relation to the morphology and anatomy of roots in two rice genotypes with different Cd accumulations in grains. Marked differences in morphology and anatomy were observed between these two genotypes under different cultivation conditions. Genotypes with low Cd accumulation in grains tended to develop fewer root tips per root surface area, larger root porosity and more mature apoplastic barriers. The stagnant cultivation condition decreased the number of root tips per root surface area but increased root porosity and accelerated apoplastic barrier formation in root tissues.Correlative Cd uptake studies revealed that rice plants with fewer number of root tips per root surface area reduced root Cd uptake ability, while mature apoplastic barriers increased root Cd retention in cell walls and the symplast. Thus, the fewer number of root tips per root surface area and the earlier formation of mature apoplastic barriers led to lower Cd uptake and translocation. The results indicated that the morphology and anatomy of roots could play important roles in Cd uptake and translocation in rice, and could be influenced by both genotype and cultivation conditions. The present results would be useful in screening and planting rice plants with low Cd accumulation.Lu Huang Wai Chin Li Nora Fung Yee Tam Zhihong Ye 2019Journal of Environmental Sciences2019,31,1:11
9Comparative analysis of the complete chloroplast genome among Prunus mume,P.armeniaca,and P.salicina显示文摘Prunus mume Sieb.et Zucc.,P.armeniaca L.,and P.salicina L.are economically important fruit trees in temperate regions.These species are taxonomically perplexing because of shared interspecific morphological traits and variation,which are mainly attributed to hybridization.The chloroplast is cytoplasmically inherited and often used for evolutionary studies.We sequenced the complete chloroplast genomes of P.mume,P.armeniaca,and P.salicina using Illumina sequencing followed by de novo assembly.The three chloroplast genomes exhibit a typical quadripartite structure with conserved genome arrangement,structure,and moderate divergence.The lengths of the genomes are 157,815,157,797,and 157,916 bp,respectively.The length of the large single-copy region(LSC)region is 86,113,86,283,and 86,122 bp,and the length of the SSC region is 18,916,18,734,and 19,028 bp;the IR region is 26,393,26,390,and 26,383 bp,respectively.Each of the three chloroplast genomes encodes 133 genes,including 94 protein-coding,31 tRNA,and eight rRNA genes.Differential gene analysis for the three species revealed that trnY-ATA is a unique gene in P.armeniaca;in contrast,the gene trnI-TAT is only present in P.mume and P.salicina,though the position of the gene in these chloroplast genomes differs.Further comparative analysis of the complete chloroplast genome sequences revealed that the ORF genes and the sequences of linked regions rps16 and atpA,atpH and atpI,trnc-GCA and psbD,ycf3 and atpB,and rpL32 and ndhD are significantly different and may be used as molecular markers in taxonomic studies.Phylogenetic evolution analysis of the three species suggests that P.mume has a closer genetic relationship to P.armeniaca than to P.salicina.Song Xue Ting Shi Wenjie Luo Xiaopeng Ni Shahid Iqbal Zhaojun Ni Xiao Huang Dan Yao Zhijun Shen Zhihong Gao 2019Horticulture Research2019,6,1:10
10Brassinosteroid Enhances Jasmonate-Induced Anthocyanin Accumulation in Arabidopsis Seedlings显示文摘Jasmonate (JA) regulates plant development, mediates defense responses, and induces anthocyanin biosynthesis as well. Previously, we isolated the psc1 mutant that partially suppressed coi1 insensitivity to JA, and found that brassinosteroid (BR) was involved in JA signaling and negatively regulated JA inhibition of root growth in Arabidopsis. In this study it was shown that JA-induced anthocyanin accumulation was reduced in BR mutants or in wild type treated with brassinazole, an inhibitor of BR biosynthesis, whereas it was induced by an application of exogenous BR. It was also shown that the'late'anthocyanin biosynthesis genes including DFR, LDOX , and UF3GT, were induced slightly by JA in the BR mutants relative to wild type. Furthermore, the expression level of JA-induced Myb/bHLH transcription factors such as PAP1, PAP2, and GL3, which are components of the WD-repeat/Myb/bHLH transcriptional complexes that mediate the 'late' anthocyanin biosynthesis genes, was lower in the BR mutants than that in wild type. These results suggested that BR affects JA-induced anthocyanin accumulation by regulating the 'late' anthocyanin biosynthesis genes and this regulation might be mediated by the WD-repeat/Myb/bHLH transcriptional complexes.Zhihong Peng Chengyun Han Libing Yuan Kun Zhang Hongman Huang Chunmei Ren 2011Journal of Integrative Plant Biology2011,53,8:9
11BubR1 phosphorylates CENP-E as a switch enabling the transition from lateral association to end-on capture of spindle microtubules显示文摘Error-free mitosis depends on accurate chromosome attachment to spindle microtubules, powered congression of those chromosomes, their segregation in anaphase, and assembly of a spindle midzone at mitotic exit. The centromere-associated kinesin motor CENP-E, whose binding partner is BubR1, has been implicated in congression of misaligned chromosomes and the transition from lateral kinetochore-microtubule association to end-on capture. Although previously proposed to be a pseudokinase, here we report the structure of the kinase domain of Drosophila melanogaster BubR1, revealing its folding into a conformation predicted to be catalytically active. BubR1 is shown to be a bona fide kinase whose phosphorylation of CENP-E switches it from a laterally attached microtubule motor to a plus-end microtubule tip tracker. Computational modeling is used to identify bubristatin as a selective BubR1 kinase antagonist that targets the αN1 helix of N-terminal extension and αC helix of the BubR1 kinase domain. Inhibition of CENP-E phosphorylation is shown to prevent proper microtubule capture at kinetochores and, surprisingly, proper assembly of the central spindle at mitotic exit. Thus, BubR1-mediated CENP-E phosphorylation produces a temporal switch that enables transition from lateral to end-on microtubule capture and organization of microtubules into stable midzone arrays.Yuejia Huang Lin Lin Xing Liu Sheng Ye Phil Y. Yao Wenwen Wang Fengrui Yang Xinjiao Gao Junying Li Yin Zhang Jiancun Zhang Zhihong Yang Xu Liu Zhenye Yang Jianye Zang Maikun Teng Zhiyong Wang Ke Ruan Xia Ding Lin Li Don W. Cleveland Rongguang Zhang Xuebiao Yao 2019Cell Research2019,29,7:8
12BRIF and CARIF progress显示文摘China Institute of Atomic Energy (CIAE) is currently constructing Beijing rare ion beam facility (BRIF) and is proposing China advanced rare ion beam facility (CARIF). This paper is aiming at introducing the progress of BRIF project and the con ceptual design CARIF. The ISOL type facility BRIF under construction is composed of a 100 MeV 300 ?A proton cyclotron, an ISOL with mass resolution of 20000, and a super-conducting LINAC of 2 MeV/q, and will be commissioned in 2013. CARIF facility proposed is planned to use both ISOL and PF techniques. It is based on a China advanced research reactor CARR that was critical, with ISOL separation of fission fragment, post acceleration to 150 MeV/u, and fragmentation of neu tron-rich fission fragment beam like 132Sn. Such unique combination will allow CARIF to deliver beam intensity better than the best world facilities by more than one order of magnitude.LIU WeiPing, LI ZhiHong, BAI XiXiang, WANG YouBao, GUO Bing, PENG ChaoHua, YANG Yi, SU Jun, CUI BaoQun, ZHOU ShuHua, ZHU ShengYun, XIA HaiHong, GUAN XiaLing, ZENG Sheng, ZHANG HuanQiao, CHEN YongShou, TANG HongQing, HUANG Li & FENG BeiYuan China Institute of Atomic Energy, P. O. Box 275(1), Beijing 102413, China 2011Science China(Physics,Mechanics & Astronomy)2011,54,S1:8
13miR-145 improves metabolic inflammatory disease through multiple pathways显示文摘Chronic inflammation plays a pivotal role in insulin resistance and type 2 diabetes,yet the mechanisms are not completely understood.Here,we demonstrated that serum LPS levels were significantly higher in newly diagnosed diabetic patients than in normal control.miR-145 level in peripheral blood mononuclear cells decreased in type 2 diabetics.LPS repressed the transcription of miR-143/145 cluster and decreased miR-145 levels.Attenuation of miR-145 activity by anti-miR-145 triggered liver inflammation and increased serum chemokines in C57BL/6 J mice.Conversely,lentivirus-mediated miR-145 overexpression inhibited macrophage infiltration,reduced body weight,and improved glucose metabolism in db/db mice.And miR-145 overexpression markedly reduced plaque size in the aorta in ApoE−/−mice.Both OPG and KLF5 were targets of miR-145.miR-145 repressed cell proliferation and induced apoptosis partially by targeting OPG and KLF5.miR-145 also suppressed NF-κB activation by targeting OPG and KLF5.Our findings provide an association of the environment with the progress of metabolic disorders.Increasing miR-145 may be a new potential therapeutic strategy in preventing and treating metabolic diseases such as type 2 diabetes and atherosclerosis.Min He Nan Wu Man Cheong Leong Weiwei Zhang Zi Ye Rumei Li Jinyang Huang Zhaoyun Zhang Lianxi Li Xiao Yao Wenbai Zhou Naijia Liu Zhihong Yang Xuehong Dong Yintao Li Lili Chen Qin Li Xuanchun Wang Jie Wen Xiaolong Zhao Bin Lu Yehong Yang Qinghua Wang Renming Hu 2020Journal of Molecular Cell Biology2020,12,2:7
14Genome analysis of Heliothis virescens ascovirus 3h isolated from China显示文摘No ascovirus isolated from China has been sequenced so far. Therefore, in this study, we aimed to sequence the genome of Heliothis virescens ascovirus 3h(Hv AV-3h) using the 454 pyrosequencing technology. The genome was found to be 190,519-bp long with a G+C content of 45.5%. We also found that it encodes 185 hypothetical open reading frames(ORFs) along with at least 50 amino acids, including 181 ORFs found in other ascoviruses and 4 unique ORFs. Gene-parity plots and phylogenetic analysis revealed a close relationship between Hv AV-3h and three other Hv AV-3a strains and a distant relationship with Spodoptera frugiperda ascovirus 1a(Sf AV-1a), Trichoplusia ni ascovirus 6a(Tn AV-6a), and Diadromus pulchellus ascovirus 4a(Dp AV-4a). Among the 185 potential genes encoded by the genome, 44 core genes were found in all the sequenced ascoviruses. In addition, 25 genes were found to be conserved in all ascoviruses except Dp AV-4a.In the Hv AV-3h genome, 24 baculovirus repeat ORFs(bros) were present, and the typical homologous repeat regions(hrs) were absent. This study supplies information important for understanding the conservation and functions of ascovirus genes as well as the variety of ascoviral genomes.Guo-Hua Huang Dian-Hai Hou Manli Wang Xiao-Wen Cheng Zhihong Hu 2017Virologica Sinica2017,32,2:6
15Enzyme@silica nanoflower@metal-organic framework hybrids: A novel type of integrated nanobiocatalysts with improved stability显示文摘一个新奇综合 nanobiocatalyst 系统基于 enzyme@silica,有改进稳定性的 nanoflower@metal 器官的框架(enzyme@SNF@ZIF-8 ) 结构第一次被制作。这个系统的通用性作为模型酶用青霉素 G acylase (针网阵列) 和过氧化氢酶(猫) 被验证。多微孔的 ZIF-8 层能被改变 ZIF-8 涂层周期的数字控制,它与不同 ZIF-8 层厚度生产 PGA@SNF@ZIF-8 nanobiocatalysts。在第二个 ZIF-8 涂层周期以后, PGA@SNF@ZIF-8 (2 ) 结构与一同类并且 well-intergrown ZIF-8 层被形成,它拥有优秀机械、化学的稳定性。而且, PGA@SNF@ZIF-8 (2 ) 表演与在硅石 nanoflowers (PGA@SNF ) 上使不能调动的免费针网阵列和针网阵列相比改进了 thermal/storage 稳定性和可重用性。获得的基于猫的 nanobiocatalysts (CAT@SNF@ZIF-8 (2 )) 也显示出优秀催化性能。Yingjie Du Jing Gao Huajiao Liu Liya Zhou Ying He Zhihong Huang Yanjun Jiang 2018Nano Research2018,11,8:5
16Effect of cigarette smoke extraction on the expression of found in inflammatory zone 1 in rat lung epithelial L2 cells显示文摘Lin Chunyan Chen Li Huang Zhihong Wu Yi Liu Shengming 2014Chinese Medical Journal2014,,12:5
17Modified Frequency Scaling Algorithm for FMCW SAR Data Processing显示文摘这份报纸论述放大算法的修改频率因为频率调制了连续波浪合成的孔雷达(FMCW SAR ) 数据处理。在在 FMCW SAR 的雷达和目标之间的相对运动将在收到的信号在接收期间并且在传播和接收之间介绍严肃的膨胀。膨胀能用常规信号处理方法在重建的图象引起严肃的失真。收到的信号被导出,在 range-Doppler 领域的收到的信号被给。在源于天线运动和方位角频率的阶段之间的关系被分析。放大算法的修改频率被建议与严肃的膨胀处理收到的信号。算法能有效地消除膨胀的影响。算法表演被模拟结果显示出。Jiang Zhihong Huang Fukan Wan Jianwei Cheng Zhu 2007Chinese Journal of Aeronautics2007,20,4:5
18A kind of biomimetic control method to anthropomorphize a redundant manipulator for complex tasks显示文摘It is an urgent problem for robots to operate complex tasks with some unknown motion mechanisms caused by the strong coupling of force and motion. However, humans can perform complex tasks well due to their natural evolution and postnatal training. A novel biomimetic control method based on a human motion mechanism with high movement adaptability is proposed in this paper. The core is to present a novel variable-parameter compliance controller based on human operation mechanisms with an action-planning method derived from optimization by human motion, and the main contribution is to change the parameters of compliance controller according to human operating intention synchronized with humanoid motion;this change could establish a humanoid map between the force and motion for a seven degree-of-freedom redundant manipulator to deal with the unknown motion mechanism in complex tasks, so the redundant manipulator can operate complex tasks with high performance. Sufficient experiments were performed, and the results validated the effectiveness of the proposed algorithm.MO Yang JIANG ZhiHong LI Hui YANG Hong HUANG Qiang 2020Science China(Technological Sciences)2020,63,1:5
19Effects of folic acid on in vitro astrocytic differentiation of neural stem cells from neonatal rats显示文摘BACKGROUND:Folic acid is essential for normal functioning of the nervous system.Previous studies have focused on the effects of folic acid on astrocyte proliferation. OBJECTIVE:To explore the effects of folic acid on astrocyte differentiation of neural stem cells (NSCs) and the related mechanisms in vitro. DESIGN,TIME AND SETTING:A randomized,controlled,grouping experiment was performed in Tianjin Medical University between August 2007 and October 2008. MATERIALS:Folic acid and 5-bromo-2-deoxyuridine(BrdU) were obtained from Sigma,MO,USA. Primary antibodies[rabbit anti-rat nestin,β-tubulin-Ⅲ,glial fibrillary acidic protein,and neurogenin1 (Ngn1);mouse anti-rat BrdU andβ-actin monoclonal antibodies]were purchased from Santa Cruz Biotechnology,USA. METHODS:At 6 days of NSC proliferation from 24-hour-old neonatal rats,BrdU incorporation assay was performed.Seven days after primary culture,NSCs were induced to differentiate with medium containing 5%fetal bovine serum.Cultured NSCs were assigned to three groups:control,low-dose (liquid media with 8 mg/L folic acid),and high-dose folic acid(liquid media with 44 mg/L folic acid). MAIN OUTCOME MEASURES:At day 7 after primary culture,the cells were identified as NSCs by immunocytochemical methods.Double-label immunofluorescence technique for glial fibrillary acidic protein/BrdU detected differentiated cells 7 days after induction.Western blot was used to analyze expression of Ngn1 protein in NSCs. RESULTS:In serum-free suspension medium,neurospheres comprised a large number of Nestin-, glial fibrillary acidic protein-,β-tubulin-Ⅲ-,and BrdU-positive cells.Compared with the control group, high-dose folic acid supplementation led to an marked increase in the percentage of glial fibrillary acidic protein/BrdU-positive cells(P<0.05),and significantly decreased Ngn1 protein expression (P<0.05). CONCLUSION:Folic acid promotes astrocytic differentiation of NSCs,which might be related to downregulation of Ngn1 protein expression.Xumei Zhang Guowei Huang Zhihong Tian Guanglei Wang Dalin Ren 2009Neural Regeneration Research2009,4,8:4
20Genome Analysis of Dasineura jujubifolia Toursvirus 2,A Novel Ascovirus显示文摘So far,ascoviruses have only been identified from Lepidoptera host insects and their transmission vectors-endoparasitic wasps.Here,we reported the first finding of a complete novel ascovirus genome from a Diptera insect,Dasineura jujubifolia.Initially,sequence fragments with homology to ascoviruses were incidentally identified during metagenomic sequencing of the mitochondria of D.jujubifolia(Cecidomyiidae,Diptera)which is a major pest on Ziziphus jujuba.Then a full circular viral genome was assembled from the metagenomic data,which has an A+T percentage of 74%and contains 142,600 bp with 141 open reading frames(ORFs).Among the 141 ORFs,37 were conserved in all sequenced ascoviruses(core genes)including proteins predicted to participate in DNA replication,gene transcription,protein modification,virus assembly,lipid metabolism and apoptosis.Multi-gene families including those encode for baculovirus repeated open reading frames(BROs),myristylated membrane proteins,RING/U-box E3 ubiquitin ligases,and ATP-binding cassette(ABC)transporters were found in the virus genome.Phylogenetic analysis showed that the newly identified virus belongs to genus Toursvirus of Ascoviridae,and is therefore named as Dasineura jujubifolia toursvirus 2(DjTV-2a).The virus becomes the second reported species of the genus after Diadromus pulchellus toursvirus 1(DpTV-1a).The genome arrangement of DjTV-2a is quite different from that of DpTV-1a,suggesting these two viruses separated in an early time of evolution.The results suggest that the ascoviruses may infect a much broader range of hosts than our previous knowledge,and shed lights on the evolution of ascoviruses and particularly on that of the toursviruses.Jun Wang Minglu Yang Haibing Xiao Guo-Hua Huang Fei Deng Zhihong Hu 2020Virologica Sinica2020,35,2:4
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