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Organizational Innovation of Apical Actin Filaments Drives Rapid Pollen Tube Growth and Turning

Molecular Plant 2017年第7期10卷 930-947页

作者： Xiaolu qu Ruihui Zhang Meng Zhang min Diao Yongbiao Xue Shanjin Huang Center for Plant Biology School of Life Sciences Tsinghua University Beijing 100084 China Key Laboratory of Plant Molecular Physiology Institute of Botany Chinese Academy of Sciences Beijing 100093 China State Key Laboratory of Molecular Developmental Biology Institute of Genetics and Developmental Biology Chinese Academy of Sciences Beijing 100101 China Beijing Institute of Genomics Chinese Academy of Sciences Beijing 100101 China

Polarized tip growth is a fundamental cellular process in many eukaryotes. In this study, we examined the dynamic restructuring of the actin cytoskeleton and its relationship to vesicle transport during pollen tip growth in Arabidopsis. We found that actin filaments originating from the apical membrane form a specialized structure consisting of longitudinally aligned actin bundles at the cortex and inner cytoplasmic fila- ments with a distinct distribution. Using actin-based pharmacological treatments and genetic mutants in combination with FRAP （fluorescence recovery after photobleaching） technology to visualize the transport of vesicles within the growth domain of pollen tubes, we demonstrated that cortical actin filaments facilitate tip-ward vesicle transport. We also discovered that the inner apical actin filaments prevent backward movement of vesicles, thus ensuring that sufficient vesicles accumulate at the pollen tube tip to support the rapid growth of the pollen tube. The combinatorial effect of cortical and internal apical actin filaments perfectly explains the generation of the inverted ＂V＂ cone-shaped vesicle distribution pattern at the pollen tube tip. When pollen tubes turn, apical actin filaments at the facing side undergo depolymerization and repolymerization to reorient the apical actin structure toward the new growth direction. This actin restructuring precedes vesicle accumulation and changes in tube morphology. Thus, our study provides new insights into the functional relationship between actin dynamics and vesicle transport during rapid and directional pollen tube growth.

关键词： pollen tube clear zone apical actin structure actin dynamics vesicle trafficking myosin

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Resource Allocation and Power Control Policy for Device-to-Device Communication Using Multi-Agent Reinforcement Learning

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Computers, Materials & Continua 2020年第6期63卷 1515-1532页

作者： Yifei Wei Yinxiang qu min Zhao Lianping Zhang F.Richard Yu Beijing Key Laboratory of Work Safety Intelligent Monitoring Beijing University of Posts and TelecommunicationsBeijing100876China Alibaba Cloud Computing Hangzhou311121China Department of Systems and Computer Engineering Carleton UniversityOttawaK1S 5B6Canada

Device-to-Device(D2D)communication is a promising technology that can reduce the burden on cellular networks while increasing network *** this paper,we focus on the channel resource allocation and power control to improve the system resource utilization and network ***,we treat each D2D pair as an independent *** agent makes decisions based on the local channel states information observed by *** multi-agent Reinforcement Learning(RL)algorithm is proposed for our multi-user *** assume that the D2D pair do not possess any information on the availability and quality of the resource block to be selected,so the problem is modeled as a stochastic non-cooperative ***,each agent becomes a player and they make decisions together to achieve global ***,the multi-agent Q-learning algorithm based on game theory is ***,in order to accelerate the convergence rate of multi-agent Q-learning,we consider a power allocation strategy based on Fuzzy C-means(FCM)*** strategy firstly groups the D2D users by FCM,and treats each group as an agent,and then performs multi-agent Q-learning algorithm to determine the power for each group of D2D *** simulation results show that the Q-learning algorithm based on multi-agent can improve the throughput of the *** particular,FCM can greatly speed up the convergence of the multi-agent Q-learning algorithm while improving system throughput.

关键词： D2D communication resource allocation power control multi-agent Q-learning fuzzy C-means

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Dynamic Load Identification in Time Domain

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China Ocean Engineering 1991年第3期6卷 279-286页

作者： Chu, Liangcheng qu, Naisi Wu, Ruifeng Lu, min Yang, Guojin Dalian Univ of Technology Dalian China

In the time domain method the dynamic load is successfully identified when the accelerations, velocities and displacements or velocities and displacements of the structure are known. But in engineering practice or experiments usually only the acceleration response is recorded. In this paper an improved time domain method is proposed for dynamic load identification. In this method by using of Duhamel integral, only the acceleration response is required for load identification. As an application of the present method, the dynamic ice load on a Bohai offshore platform is identified based on some measured acceleration. The identified values of ice load are in good agreement with the measured ones.

关键词： MArine Platforms Mathematical Techniques Time Domain Analysis Offshore Structures Stresses

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Innovation Governs Everything Eventually:Extensions of the DeGroot Model

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Acta Mathematicae Applicatae Sinica 2017年第1期33卷 35-42页

作者： ming-min YANG Xing-long qu Zhi-gang CAO Xiao-guang YANG Key Laboratory of Management Decision and Information SystemsAcademy of Mathematics and Systems ScienceChinese Academy of Sciences The Research Center of Information Technology & Economic and Social Development Hangzhou Dianzi University

We study the DeGroot model for continuous opinion dynamics under the influence of innovations. In the original model, individuals＇ opinions, after given their initial values, evolve merely according to the given learning topology. The main contribution of this paper is that external innovation effects are introduced： each individual is given the opportunity to change her opinion to a randomly selected opinion according to a given distribution on the opinion space and then the external opinion is either adapted by the individual, or combined into her learning process. It turns out that all the classical results of the DeGroot model are violated in this new model. We prove that convergence can still be guaranteed in the expectation sense, regardless of the learning topology. We also study the steady distributions of opinions among the society and the time spent to reach a steady state by means of Monte-Carlo simulations.

关键词： social network non-Bayesian learning opinion dynamics DeGroot model

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Rno_circ_0005139 regulates apoptosis by targeting Wnt5a in rat anorectal malformations

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World Journal of Gastroenterology 2020年第29期26卷 4272-4287页

作者： Dan Liu Yuan qu Zheng-Nong Cao Hui-min Jia Department of Pediatric Surgery Shengjing Hospital of China Medical UniversityShenyang 110004Liaoning ProvinceChina

BACKGROUND The molecular mechanisms underlying anorectal malformations(ARM)are not fully *** RNAs(circRNAs)are new born non-coding RNAs,and their role in ARM is *** assumed that rno_circ_0005139 influences apoptosis and proliferation by acting as a miR-324-3p sponge,and downregulating Wnt5a in *** To identify the differential expression of circRNAs and mRNAs in a rat ARM *** Sixty-six pregnant Wistar rats were randomly divided into two groups:ARM group(2-imidazolidinethione-induced)and control *** were harvested by cesarean delivery,and anorectal tissue was taken on embryonic days 16(E16),17(E17),19(E19),and 21(E21).RNA sequencing and gene microarray analysis was used to identify differentially expressed circRNAs and mRNAs in the ARM in a rat *** selected 6 circRNAs and 3 mRNAs in the Wnt signal pathway from the result of the RNA sequencing and gene microarray analysis,and quantitative reverse transcription polymerase chain reaction was performed to evaluate their tissue *** to bioinformatics prediction,rno_circ_0005139 acted as a miR-324-3p sponge to regulate the expression of *** chose rno_circ_0005139 and Wnt5a as the final *** tested the function of rno_circ_0005139 and the binding sites between rno_circ_0005139 and miR-324-3p,miR-324-3p and Wnt5a by luciferase ***-transfection of rno_circ_0005139 and miR-324-3p was to verify their functional *** We identified 38 upregulated and 42 downregulated circRNAs on E17(P2.0).We found that rno_circ_0006880 and rno_circ_0011386 were upregulated,whereas rno_circ_0000436,rno_circ_0005139,rno_circ_0009285,rno_circ_0014367,Wnt5a,Wnt10b,and Wnt2b were downregulated in ARM *** to bioinformatics prediction,rno_circ_0005139 acted as a miR-324-3p sponge to regulate the expression of *** chose rno_circ_0005139 a

关键词： Anorectal malformation Circular RNA MicroRNA Wnt5a Rno_circ_0005139

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The formation and repair of DNA double-strand breaks in mammalian meiosis

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Asian Journal of Andrology 2021年第6期23卷 572-579页

作者： Wei qu Cong Liu Ya-Ting Xu Yu-min Xu Meng-Cheng Luo Hubei Provincial Key Laboratory of Developmentally Originated Disease School of Basic Medical SciencesWuhan UniversityWuhan 430072China

Programmed DNA double-strand breaks(DSBs)are necessary for meiosis in mammals.A sufficient number of DSBs ensure the normal pairing/synapsis of homologous *** DSB repair undermines meiosis,leading to sterility in *** DSBs that initiate recombination are repaired as crossovers and noncrossovers,and crossovers are required for correct chromosome ***,the placement,timing,and frequency of crossover formation must be tightly ***,mutations in many genes related to the formation and repair of DSB result in infertility in *** mutations cause nonobstructive azoospermia in men,premature ovarian insufficiency and ovarian dysgenesis in ***,we have illustrated the formation and repair of DSB in mammals,summarized major factors influencing the formation of DSB and the theories of crossover regulation.

关键词： azoospermia crossover DSB meiosis recombination

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可可毛色二孢菌侵染芒果果实时茉莉酸和水杨酸信号通路的抗性响应

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食品科学 2025年第1期46卷 11-17页

作者：屈湘乡胡美姣孙进华弓德强高兆银陈更新李敏中国热带农业科学院环境与植物保护研究所海南海口571101 海南大学生命科学学院海南海口570228 海南大学热带农林学院海南海口570228

为明确可可毛色二孢菌(Lasiodiplodia theobromae)侵染芒果果实过程中茉莉酸(jasmonic acid,JA)和水杨酸(salicylic acid,SA)信号通路的响应模式,分析***与芒果果实互作过程中侵染菌丝体JA和SA的合成、芒果果实中JA和SA的合成及其信号... 详细信息

为明确可可毛色二孢菌(Lasiodiplodia theobromae)侵染芒果果实过程中茉莉酸(jasmonic acid,JA)和水杨酸(salicylic acid,SA)信号通路的响应模式,分析***与芒果果实互作过程中侵染菌丝体JA和SA的合成、芒果果实中JA和SA的合成及其信号通路相关基因和抗性相关基因表达情况。结果表明:***在侵染芒果果实时JA和SA产量逐渐增加;接种的芒果果实中JA产量显著升高,SA产量则显著下降(PminPR1)基因早期表达上调,后期表达下调;苯丙氨酸解氨酶(MiPAL)、过氧化物酶(MiPOD)和β-1,3-葡聚糖酶(MiGLU)基因前期表达上调,几丁质酶(MiCHI)基因表达12 h后持续上调。上述结果表明,在侵染芒果果实过程中,***激活了果实JA的合成及其信号转导,但持续抑制了果实SA的合成及其信号转导。

关键词：茉莉酸水杨酸芒果可可毛色二孢采后病害

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Copper-coated Porous Polyimide as Ultralight and Safe Current Collectors for Advanced LIBs

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Chinese Journal of Polymer Science 2024年第4期42卷 521-531页

作者： cun-Sheng Liu Jun-Qi Hu Ting-Ting Mao Song-Yi Liao Ru-ming Feng Yi-Dong Liu Yong-Gang min School of Materials and Energy Guangdong University of TechnologyGuangzhou510006China College of Chemistry and Chemical Engineering Zhongkai University of Agriculture and EngineeringGuangzhou510225China Shanwei Branch of Advanced Energy Science and Technology Guangdong Laboratory Shanwei516600China

Metallic copper is widely used as current collector(CC) for graphite anode of lithium-ion batteries(LIBs) due to its high electrical conductivity and electrochemical stability. However, the large volume density of commercial copper foil(~8.9 g·cm^(-3)) limits the increase of energy density of battery. Here, copper-coated porous polyimide(Cu@PPI) was prepared by vacuum evaporation as collector for the graphite anode. The sandwich structure connects the copper metal on both sides of the collector with excellent electrical conductivity. Compared to commercial Cu foil, Cu@PPI has lighter mass(≤3.9 mg for disc of 12 mm diameter versus 9.9 mg of ~10 μm Cu foil) and lower volume density(≤3.3 g·cm^(-3)). In addition, the porous structure allows of better adhesion of reactive substances and electrochemical properties than pure Cu foils. It is estimated that the energy density of Cu@PPI should be much higher than that of Cu foil. This strategy should be applicable for other current collectors.

关键词： Copper-coated Vacuum evaporation Porous polyimide(PPI) Current collector(CC) LIBs

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Effect of different mulch materials on winter wheat production in desalinized soil in Heilonggang region of North China

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2006年第11期7卷 858-867页

作者： YANG Yan-min LIU Xiao-jing LI Wei-qiang LI cun-zhen Research Center for Agricultural Resources Institute of Genetics and Developmental Biology Chinese Academy of Sciences Shijiazhuang 050021 China lnstitute of Geography Science and Natural Resource Research Chinese Academy of Sciences Beijing 100101 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China

Freshwater shortage is the main problem in Heilonggang lower-lying plain, while a considerable amount of underground saline water is available. We wanted to find an effective way to use the brackish water in winter wheat production. Surface mulch has significant effect in reducing evaporation and decreasing soil salinity level. This research was aimed at comparing the effect of different mulch materials on winter wheat production. The experiment was conducted during 2002-2003 and 2003-2004. Four treatments were setup：（1） no mulch, （2） mulch with plastic film, （3） mulch with corn straw, （4） mulch with concrete slab between the rows. The result indicated that concrete mulch and straw mulch was effective in conserving soil water compared to plastic film mulch which increased soil temperature. Concrete mulch decreases surface soil salinity better in comparison to other mulches used. Straw mulch conserved more soil water but decreased wheat grain yield probably due to low temperature. Concrete mulch had similar effect with plastic film mulch on promoting winter wheat development and growth.

关键词： Mulch Plastic film Corn straw Concrete Saline water Wheat growth

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Synergistic extraction of zinc from ammoniacal solutions using a β-diketone mixed with trialkylphosphine oxide

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Rare Metals 2019年第3期38卷 270-276页

作者： Ru-Long Zhu Xin-Bin Li Chang Wei Hui Huang min-Ting Li cun-Xiong Li Fu-Li Tang Faculty of Metallurgy and Energy Engineering Kunming University of Science and Technology Yunnan Yuntong Zinc Co. Ltd

A simple comparative study of synergistic extraction of zinc from ammonium sulfate and ammonium chloride systems with mixtures of Mextral54-100 and tri-nalkylphosphine oxide(TRPO) dissolved in n-heptane was described. Various parameters affecting the extraction process were investigated. Experimental results show that extraction from ammonium sulfate is better than that from ammonium chloride under the same conditions owing to the additional complexation between zinc and chloride ions. Total ammonium concentration and pH have a significant effect on zinc extraction efficiency because of the formation of zinc ammine complexes. The synergistic effect is explained by the formation of adduct between zinc chelates and trialkylphosphine oxide. The thermodynamic data show that the extraction reaction is exothermic and stripping is endothermic. Infrared(IR) spectra of the zincloaded organic phases were also examined.

关键词： Synergistic extraction Zinc Ammonium sulfate Ammonium chloride Mextral54-100 Trialkylphosphine oxide

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