检索结果-南通市图书馆

Leaf Morphology Genes SRL1 and RENL1 Co-Regulate Cellulose Synthesis and Affect Rice Drought Tolerance

Rice science 2024年第1期31卷 103-117,I0020-I0022页

作者： LIU Dan ZHAO Huibo WANG Zi’an XU Jing LIU Yiting WANG Jiajia CHEN Minmin LIU Xiong ZHANG Zhihai CEN Jiangsu ZHU Li HU Jiang REN Deyong gao zhenyu DONG Guojun ZHANG Qiang SHEN Lan LI Qing QIAN Qian HU Songping ZHANG Guangheng State Key Laboratory of Rice Biology and Breeding China National Rice Research InstituteHangzhou 310006China Research Center of Plant Functional Genes and Tissue Culture Technology College of Bioscience and BioengineeringJiangxi Agricultural UniversityNanchang 330045China Qian Qian Academician Workstation National Nanfan Research Institute(Sanya)Chinese Academy of Agricultural SciencesSanya 572024China

The morphological development of rice(Oryza sativa L.)leaves is closely related to plant architecture,physiological activities,and resistance.However,it is unclear whether there is a co-regulatory relationship between the morphological development of leaves and adaptation to drought environment.In this study,a drought-sensitive,roll-enhanced,and narrow-leaf mutant(renl1)was induced from a semi-rolled leaf mutant(srl1)by ethyl methane sulfonate(EMS),which was obtained from Nipponbare(NPB)through EMS.Map-based cloning and functional validation showed that RENL1 encodes a cellulose synthase,allelic to NRL1/OsCLSD4.The RENL1 mutation resulted in reduced vascular bundles,vesicular cells,cellulose,and hemicellulose contents in cell walls,diminishing the water-holding capacity of leaves.In addition,the root system of the renl1 mutant was poorly developed and its ability to scavenge reactive oxygen species(ROS)was decreased,leading to an increase in ROS after drought stress.Meanwhile,genetic results showed that RENL1 and SRL1 synergistically regulated cell wall components.Our results revealed a theoretical basis for further elucidating the molecular regulation mechanism of cellulose on rice drought tolerance,and provided a new genetic resource for enhancing the synergistic regulation network of plant type and stress resistance,thereby realizing simultaneous improvement of multiple traits in rice.

关键词： cellulose cell wall drought tolerance leaf morphology rice

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Enriched Constant Elements in the Boundary Element Method for Solving 2D Acoustic Problems at Higher Frequencies

引用

Computer Modeling in Engineering & Sciences 2024年第3期138卷 2159-2175页

作者： Zonglin Li zhenyu gao Yijun Liu School of Astronautics Harbin Institute of TechnologyHarbin150001China Department of Mechanics and Aerospace Engineering Southern University of Science and TechnologyShenzhen518055China

The boundary element method(BEM)is a popular method for solving acoustic wave propagation problems,especially those in exterior domains,owing to its ease in handling radiation conditions at infinity.However,BEM models must meet the requirement of 6–10 elements per wavelength,using the conventional constant,linear,or quadratic elements.Therefore,a large storage size of memory and long solution time are often needed in solving higher-frequency problems.In this work,we propose two new types of enriched elements based on conventional constant boundary elements to improve the computational efficiency of the 2D acoustic BEM.The first one uses a plane wave expansion,which can be used to model scattering problems.The second one uses a special plane wave expansion,which can be used tomodel radiation problems.Five examples are investigated to showthe advantages of the enriched elements.Compared with the conventional constant elements,the new enriched elements can deliver results with the same accuracy and in less computational time.This improvement in the computational efficiency is more evident at higher frequencies(with the nondimensional wave numbers exceeding 100).The paper concludes with the potential of our proposed enriched elements and plans for their further improvement.

关键词： Enriched boundary elements constant elements 2D acoustic problems higher frequency

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

An Improved Harris Hawk Optimization Algorithm for Flexible Job Shop Scheduling Problem

引用

Computers, Materials & Continua 2024年第2期78卷 2337-2360页

作者： Zhaolin Lv Yuexia Zhao Hongyue Kang zhenyu gao Yuhang Qin College of Systems Engineering National University of Defense TechnologyChangsha410073China College of Information Management Nanjing Agricultural UniversityNanjing210031China Department of Intelligent Supply Chain JD LogisticsBeijing100076China College of Intelligent Science and Technology National University of Defense TechnologyChangsha410073China

Flexible job shop scheduling problem(FJSP)is the core decision-making problem of intelligent manufacturing production management.The Harris hawk optimization(HHO)algorithm,as a typical metaheuristic algorithm,has been widely employed to solve scheduling problems.However,HHO suffers from premature convergence when solving NP-hard problems.Therefore,this paper proposes an improved HHO algorithm(GNHHO)to solve the FJSP.GNHHO introduces an elitism strategy,a chaotic mechanism,a nonlinear escaping energy update strategy,and a Gaussian random walk strategy to prevent premature convergence.A flexible job shop scheduling model is constructed,and the static and dynamic FJSP is investigated to minimize the makespan.This paper chooses a two-segment encoding mode based on the job and the machine of the FJSP.To verify the effectiveness of GNHHO,this study tests it in 23 benchmark functions,10 standard job shop scheduling problems(JSPs),and 5 standard FJSPs.Besides,this study collects data from an agricultural company and uses the GNHHO algorithm to optimize the company’s FJSP.The optimized scheduling scheme demonstrates significant improvements in makespan,with an advancement of 28.16%for static scheduling and 35.63%for dynamic scheduling.Moreover,it achieves an average increase of 21.50%in the on-time order delivery rate.The results demonstrate that the performance of the GNHHO algorithm in solving FJSP is superior to some existing algorithms.

关键词： Flexible job shop scheduling improved Harris hawk optimization algorithm(GNHHO) premature convergence maximum completion time(makespan)

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fixed-Time Leader-Following Formation Control of Fully-Actuated Underwater Vehicles Without Velocity Measurements

引用

Journal of Systems Science & Complexity 2022年第2期35卷 559-585页

作者： gao zhenyu ZHANG Yi GUO Ge School of Control Engineering Northeastern University at QinhuangdaoQinhuangdao 066004China

This paper is concerned with formation control of fully-actuated underwater vehicles(FUVs),focusing on improving system convergence speed and overcoming velocity measurement limitation.By employing the fixed-time control theory and command filtering technique,a full state feedback formation algorithm is proposed,which makes the follower track the leader in a given time with all signals in the system globally practically stabilized in fixed time.To avoid degraded control performance due to inaccurate velocity measurement,a fixed-time convergent observer is designed to estimate the velocity of FUVs.Then the authors give an observer-based fixed-time control method,with which acceptable formation performance can be achieved in fixed time without velocity measurement.The effectiveness and performance of the proposed method are demonstrated by numerical simulations.

关键词： Fixed-time control formation control fully-actuated underwater vehicles(FUVs) state feedback control velocity observer

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Carotenoid isomerase regulates rice tillering and grain productivity by its biosynthesis pathway

引用

Journal of Integrative Plant Biology 2024年第2期66卷 172-175页

作者： Chaoqing Ding Zhengji Shao Yuping Yan Guangheng Zhang Dali Zeng Li Zhu Jiang Hu zhenyu gao Guojun Dong Qian Qian Deyong Ren State Key Laboratory of Rice Biology and Breeding ChinaNational Rice Research InstituteHangzhou 310006China

Tillers are unique inflorescence-like branches in grasses,and their number determines the panicle number,plant architecture,and yield(Shang et al.,2021).Tiller formation mainly undergoes axillary meristem(AM)initiation and tiller bud outgrowth(Wang et al.,2018;Yan et al.,2023).The rice(Oryza sativa)KNOX gene OSH1 is expressed in AMs,and an osh1 mutant produces fewer tillers(Tanaka et al.,2015).

关键词： sativa Oryza panicle

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Role of miR-128/216a Regulating Isl1 Expression during Differentiation of Human Umbilical Cord Mesenchymal Stem Cells into Insulin-Producing Cells

引用

Wuhan University Journal of Natural Sciences 2023年第2期28卷 177-184页

作者： MU Tianchi WANG Tao gao zhenyu PAN Xin LIU Yingxue Clinical Laboratory of the First Affiliated Hospital Jinzhou Medical UniversityJinzhou 121001LiaoningChina Medical Treatment College Jinzhou Medical UniversityJinzhou 121013LiaoningChina Nephrology of Jinzhou Central Hospital Jinzhou 121001LiaoningChina

Islet-1(Isl1),a LIM homeodomain protein,is expressed in the embryonic pancreatic epithelium.As a key transcription factor,Isl1 can not only regulate insulin gene expression in normal glucose condition but also maintainβ-cell function and impact pancreaticβ-cell target genes.Some experiments have suggested that Micro RNA(miRNA)can play a critical role during the induction of insulinproducing cells(IPCs).However,it is unclear whether miRNA may regulate Isl1 expression during differentiation of human umbilical cord mesenchymal stem cells(HUMSCs)into IPCs.In this investigation,we induced HUMSCs into IPCs with a modified two-step protocol,activin A,retinoic acid(step1)and conophylline,nicotinamide(step2).To find the miRNA regulating Isl1 expression,we respectively used Target Scan,miRDB and RNAhybrid to predict and got the result,miR-128 and miR-216a.The miRNAs can inhibit Isl1 expression by dual luciferase assay.The results of real-time Polymerase Chain Reaction(PCR)showed that Isl1 expression level was almost reciprocal to that of miR-128 and miR-216a during differentiation of HUMSCs into IPCs.Furthermore,over-expression of miR-128 or miR-216a downregulated expression levels of Isl1 and Maf A.Therefore,miR-128 or miR-216a may regulate expression of islet-specific transcription factors to control differentiation of HUMSCs into IPCs.

关键词： microRNA(miRNA) Isl1 human umbilical cord mesenchymal stem cells(HUMSCs) insulin-producing cells(IPCs)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

OsAMT1.1 Expression by Nitrate-Inducible Promoter of OsNAR2.1 Increases Nitrogen Use Efficiency and Rice Yield

引用

Rice science 2023年第3期30卷 222-234,I0038页

作者： JIANG Hongzhen WANG Yamei LAI Liuru LIU Xintong MIAO Changjian LIU Ruifang LI Xiaoyun TAN Jinfang gao zhenyu CHEN Jingguang School of Agriculture Shenzhen Campus of Sun Yat-sen UniversityShenzhen 518107China The High School Affiliated to Renmin University of China Shenzhen 518119China China National Rice Research Institute Chinese Academy of Agricultural SciencesHangzhou 310006China

Nitrate(NO_(3)^(-))and ammonium(NH_(4)^(+))are two main inorganic nitrogen(N)sources during crop growth.Here,we enhanced the expression of OsAMT1.1,which encodes a NH_(4)^(+)transporter,using the NO_(3)^(-)-inducible promoter of OsNAR2.1 and an ubiquitin promoter in transgenic rice plants.Under field condition of 120 kg/hm2 N,agronomic N use efficiency,N recovery efficiency and N transport efficiency,and grain yield of the pOsNAR2.1:OsAMT1.1 transgenic lines were increased compared with those of the wild type(WT)and the pUbi:OsAMT1.1 transgenic plants.Under 2.0 mmol/L NO_(3)^(-)+0.5 mmol/L NH_(4)^(+)and 0.5 mmol/L NO_(3)^(-)+2.0 mmol/L NH_(4)^(+)conditions of hydroponic culture,compared with the WT,both biomass and total N content were increased in the pOsNAR2.1:OsAMT1.1 transgenic lines.However,biomass was significantly reduced in pUbi:OsAMT1.1 transgenic plants under 0.5 mmol/L NO_(3)^(-)+2.0 mmol/L NH_(4)^(+)condition.The lines expressing pOsNAR2.1:OsAMT1.1 exhibited increased OsAMT1.1 expression and 15NH_(4)^(+)influx in roots under both 2.0 mmol/L NO_(3)^(-)+0.5 mmol/L NH_(4)^(+)and 0.5 mmol/L NO_(3)^(-)+2.0 mmol/L NH_(4)^(+)conditions.Our study showed that expression of OsAMT1.1 can be promoted when driven by the OsNAR2.1 promoter,especially under high-level nitrate condition,leading to enhancement of NH_(4)^(+)uptake,N use efficiency and grain yield.

关键词： OsAMT1.1 OsNAR2.1 promoter nitrogen use efficiency yield rice

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

An Arduous but Hopeful Journey:Implementing Project-Based Learning in a Middle School of China

引用

Frontiers of Education in China 2012年第4期7卷 608-634页

作者： gao zhenyu School of Educational Science Hangzhou Normal UniversityHangzhou 310018China

The main purpose of this study is to investigate the lived experience of teachers from one middle school in East China who implemented project-based learning(PBL)in their classes.A sample of 22 grade 6 and 7 teachers participated in this research between September 2008 and June 2010.Data were collected from multiple sources including field notes of classroom observation,transcripts of semi-structural interviews and workshop audiotapes.It reveals that teachers were struggling with the roles they should play and in particular with how to effectively facilitate students’project work.However,they also creatively reconceptualized the new curriculum from their own perspectives and brought their students unique and diverse learning experiences.These struggles and reconceptualizations are believed to be the result of teachers’evaluative,identifying and pedagogical culture-cognitions.

关键词： project-based learning(PBL) curriculum implementation culture-cognition

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

冻融循环下地下开采对既有边坡稳定性影响数值分析

引用

金属矿山 2024年第4期 221-227页

作者：高振宇苗浩东常远辽宁科技大学土木工程学院辽宁鞍山114051

为研究不同地下开采工况下既有冻融边坡的稳定性,本文利用3DEC对不同冻融次数下既有边坡的采动稳定性进行了数值模拟,从位移、应力、塑性区、安全系数和能量等方面分析了不同地下开采速度和冻融次数对边坡的影响。结果表明:冻融次数的... 详细信息

为研究不同地下开采工况下既有冻融边坡的稳定性,本文利用3DEC对不同冻融次数下既有边坡的采动稳定性进行了数值模拟,从位移、应力、塑性区、安全系数和能量等方面分析了不同地下开采速度和冻融次数对边坡的影响。结果表明:冻融次数的增加会导致坡面位移及应力增大;空区顶板垂直应力以煤柱为中心呈现对称式分布,当开采速度由30 m/步变为50 m/步时(开采200 m),顶板最大垂直应力从10 MPa增大到30 MPa。冻融边坡表面的张拉破坏范围会随着冻融次数的增加而逐渐增大,边坡安全系数随冻融次数增加而减小,在冻融20次后存在失稳风险。冻融边坡的重力势能与耗散能受冻融次数影响较小,且当冻融次数相同时对开采速度变化不敏感;而冻融边坡释放的动能随冻融次数增多而增大,且当冻融次数增多时,不同开采速度下释放的动能差距增大。

关键词：冻融循环地下开采开采速度既有边坡能量演化

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

赛沃替尼治疗间质-上皮细胞转化因子突变的局部晚期或转移性非小细胞肺癌的成本-效果分析

引用

中国医院药学杂志 2024年第6期44卷 690-695页

作者：蒋媛高振宇王美飒史桂玲天津市人民医院药学部天津300121 南开大学组合数学中心天津300170

目的:对赛沃替尼与克唑替尼这2组方案治疗间质-上皮细胞转化因子(mesenchymal-epithelial transition factor,MET)突变的局部晚期或转移性非小细胞肺癌(non-small cell lung cancer,NSCLC)进行成本-效果分析,以期为医疗卫生决策提供参... 详细信息

目的:对赛沃替尼与克唑替尼这2组方案治疗间质-上皮细胞转化因子(mesenchymal-epithelial transition factor,MET)突变的局部晚期或转移性非小细胞肺癌(non-small cell lung cancer,NSCLC)进行成本-效果分析,以期为医疗卫生决策提供参考。方法:基于临床试验数据,构建分区生存模型,从中国卫生体系角度出发,计算2组的总成本、质量调整生命年(quality adjusted life years,QALY)和增量成本-效果比(incremental cost-effectiveness ratio,ICER),年贴现率为5%,并采用单因素敏感性分析和概率敏感性分析法来评估参数结果的稳定性。结果:赛沃替尼组所产生的总成本为442232元,可获得0.931 QALYs;克唑替尼组则产生322138元的总成本,可获得0.677 QALYs,得出赛沃替尼组对比克唑替尼组的ICER为472799元/QALY,高于我国的意愿支付阈值(257094元/QALY)。结论:从中国医疗体系的角度出发,赛沃替尼对比克唑替尼治疗MET突变的局部晚期或转移性NSCLC不具有成本-效果性。

关键词：药物经济学成本效果分析赛沃替尼 MET突变非小细胞肺癌

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：