检索结果-南通市图书馆

Chinese Science Bulletin 2009年第19期54卷 3536-3545页

作者： zhou guoan GUAN RongXia LI YingHui CHANG RuZhen QIU LiJuan National Key Facility for Crop Gene Resources and Genetic Improvement (NFCRI)/Key Lab of Germplasm & Biotechnology (MOA) Institute of Crop Science Chinese Academy of Agricultural Sciences Beijing 100081 China

Na+/H+ antiporters have been well documented to enhance plant salt tolerance by regulating cellular ion homeostasis. Here, a putative Na+/H+ antiporter gene homolog GmNHX2 from soybean was cloned and predicted to encode a protein of 534 amino acids with 10 putative transmembrane domains. GmNHX2 was expressed in all soybean plant tissues but enriched in roots and its expression was induced by NaCl and polyethylene glycol (PEG) treatments. GmNHX2 exhibits greater sequence similarity with LeNHX2 and AtNHX6 than that of AtNHX1 and AtSOS1. Although phylogenetic analysis clustered GmNHX2 with organellar (tonoplast and vesicles) antiporters, the GmNHX2-EGFP (enhanced green fluorescent protein) fusion protein was possibly localized in the plasma membrane or organelle membrane of transgenic plant cells. Furthermore, transgenic Arabidopsis plants expressing GmNHX2 were more tolerant to high NaCl concentrations during germination and seedling stages when compared with wild-type plants. These results suggest that GmNHX2 is a membrane Na+/H+ antiporter and may function to regulate ion homeostasis under salt stress.

关键词：植物耐盐基因工程盐胁迫离子分布植物组织 GmNHX2

GenoBaits Soy40K:a highly flexible and low-cost SNP array for soybean studies

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2022年第9期65卷 1898-1901页

作者： Yucheng Liu Shulin Liu Zhifang Zhang Lingbin Ni Xingming Chen Yunxia Ge guoan zhou Zhixi Tian State Key Laboratory of Plant Cell and Chromosome Engineering Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China MolBreeding Biotechnology Co. Ltd.Shijiazhuang 050035China University of Chinese Academy of Sciences Beijing 100039China

Dear Editor,Soybean(Glycine max[L.]Merr.)provides more than half of the oilseeds and more than a quarter of protein *** is estimated that the production of soybean has to be doubled by 2050 to meet the needs of the rapidly increasing consumption of soybean seeds along with a continuously increasing population(Ray et al.,2013).As such,development of a genotyping platform with high throughput,high efficiency and high precision but low-cost is urgently needed to accelerate soybean functional study and molecular design breeding.

关键词： soybean cost doubled

SINGULAR PERTURBATION OF THREE-POINT BOUNDARY VALUE PROBLEM FOR THIRD ORDER DIFFERENTIAL EQUATIONS

在线全文

学校读者我要写书评

暂无评论

Annals of Differential Equations 2005年第3期21卷 480-485页

作者： Xu guoan Yu Zhangping zhou Zheyan School of Math. and Computer Science Fujian Normal University Fuzhou 350007

In this paper, by the theory of differential inequalities, we study the existence and uniqueness of the solution to the three-point boundary value problem for third order differential equations. Furthermore we study the singular perturbation of three-point boundary value problem to third order quasilinear differential equations, construct the higher order asymptotic solution and get the error estimate of asymptotic solution and perturbed solution.

关键词： three-point boundary value problem differential inequality singular perturbation uniqueness of solution

Natural GmACO1 allelic variations confer drought tolerance and influence nodule formation in soybean

在线全文

学校读者我要写书评

暂无评论

aBIOTECH 2024年第3期5卷 351-355页

作者： Zhifang Zhang Junkui Ma Xia Yang Shan Liang Yucheng Liu Yaqin Yuan Qianjin Liang Yanting Shen guoan zhou Min Zhang Zhixi Tian Shulin Liu Key Laboratory of Seed Innovation Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China The Industrial Crop Institute Shanxi Agricultural University/Shanxi Academy of Agricultural SciencesTaiyuan 030031China University of Chinese Academy of Sciences Beijing 100049China

Soybean[Glycine max(L.)Merr.]is one of the most important,but a drought-sensitive,*** the genes controlling drought tolerance is important in soybean ***,through a genome-wide association study,we identified one significant association locus,located on chromosome 8,which conferred drought tolerance variations in a natural soybean *** analysis and genetic validation demonstrated that GmACO1,encoding for a 1-aminocyclopropane-1-carboxylate oxidase,was the causal gene in this association locus,and positively regulated drought tolerance in ***,we determined that GmACO1 expression was reduced after rhizobial infection,and that GmACO1 negatively regulated soybean nodule ***,our findings provide insights into soybean cultivars for future breeding.

关键词： Soybean Drought tolerance GWAS Ethylene biosynthesis Nodule formation

Leaf Color(LC), which encodes a chloroplast-localized RNA recognition motif containing protein, influences leaf color and nodule number in soybean

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

Leaf Color(LC), which encodes a chloroplast-localized RNA re...

第十届上海市植物生物学青年学术研讨会

作者： Xiaowei Zhu Yucheng Liu guoan zhou Yi Pan Rui Yang Zhixi Tian Baoge Zhu State Key Laboratory of Plant Cell and Chromosome Engineering Institute of Genetics and Developmental Biology Chinese Academy of Sciences University of Chinese Academy of Sciences Horticulture Research Institute Shanghai Academy of Agricultural Sciences

The normal green leaves are crucial organs for plant ***,we characterize a soybean yellow leaf mutant yl,which exhibits yellow leaves due to the reduced levels of chlorophyll contents especially the chlorophyll *** ad...

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

套娃式新型爆炸焊接法及试样焊接质量分析

焊接学报 2021年第5期42卷 1-6,I0001页

作者：张龄匀马宏昊沈兆武周国安香港科技大学中国香港999077 中国科学技术大学中国科学院材料力学行为和设计重点试验室合肥230027

采用套娃式新型爆炸焊接法一次试验高效制备出以Q235钢为基管、T2紫铜为覆管的Q235/T2复合管及以1060工业纯铝为覆管、T2紫铜为基棒的1060/T2复合棒各一件.对试样结合界面的微观形貌及轴向压缩行为进行了测试与分析.结果表明,受传爆装... 详细信息

采用套娃式新型爆炸焊接法一次试验高效制备出以Q235钢为基管、T2紫铜为覆管的Q235/T2复合管及以1060工业纯铝为覆管、T2紫铜为基棒的1060/T2复合棒各一件.对试样结合界面的微观形貌及轴向压缩行为进行了测试与分析.结果表明,受传爆装置产生的射流影响,1060/T2爆炸焊接棒顶端有一直径约3 mm的球形凹槽,距顶部约有8.5 mm区域焊接质量较差,其余部位焊接质量良好;Q235/1060爆炸焊接管未受此影响.沿着爆轰波传播方向,Q235/T2复合管及1060/T2复合棒的结合界面均逐渐从不稳定波形结合过渡到规则的、幅值/宽度分别约为65μm/210μm、120μm/400μm的波形结合.EDS显示Q235/T2复合管结合界面处铁铜原子扩散比在44∶56~72∶28之间,1060/T2复合棒结合界面处有AlCu,Al_(2)Cu生成;力学性能方面,轴向准静态压缩条件下,Q235/T2复合管、1060/T2复合棒的屈服应力/屈服应变分别约为598 MPa/5.8%和340 MPa/4.8%.

关键词：爆炸焊接铜钢合金铜铝合金显微结构力学性能

在线全文

学校读者我要写书评

暂无评论

基于Pareto杂波的参数估计范围研究

现代雷达 2018年第12期40卷 15-19页

作者：傅俊滔周国安陈红空军工程大学防空反导学院解放军61769部队

当雷达工作在高海情环境时,相比于K分布模型,Pareto分布是一种优势更大的统计杂波模型。基于Pareto杂波模型的参数估计研究,一直存在着参数估计表达式不闭合以及参数估计范围受限的问题,该文利用了正数阶矩估计的方法,不仅得到了闭合的... 详细信息

当雷达工作在高海情环境时,相比于K分布模型,Pareto分布是一种优势更大的统计杂波模型。基于Pareto杂波模型的参数估计研究,一直存在着参数估计表达式不闭合以及参数估计范围受限的问题,该文利用了正数阶矩估计的方法,不仅得到了闭合的估计表达式,而且扩大了参数估计的范围。同时,提出了负数阶矩估计,使参数估计的范围覆盖到参数的整个取值区间。实验表明,负数阶矩估计法运算速度快,估计范围不受限。与传统的估计法相比,参数取值越小,负数阶矩估计的估计性能越好,并且估计精度呈指数趋势提高。

关键词：杂波 Pareto分布参数估计估计范围

在线全文

学校读者我要写书评

暂无评论

CMP抛光液供给及分布系统的研究

电子工业专用设备 2013年第6期42卷 9-12,20页

作者：周国安中国电子科技集团公司第四十五研究所北京101601

从整体结构及硬件设计方面介绍了小批量生产及隔膜泵系统,分析隔膜泵的工作原理,循环机理及硬件控制和驱动电路,同时指出在湿度较大的生产厂里面产生的漂移及解决措施;从整体结构分析集中式抛光液供给系统,分析其抛光液混合中心具备的... 详细信息

从整体结构及硬件设计方面介绍了小批量生产及隔膜泵系统,分析隔膜泵的工作原理,循环机理及硬件控制和驱动电路,同时指出在湿度较大的生产厂里面产生的漂移及解决措施;从整体结构分析集中式抛光液供给系统,分析其抛光液混合中心具备的温度控制、无轴承磁悬浮泵工作机理及循环机制;对比隔膜泵与无轴承磁悬浮泵对颗粒凝聚的影响,并分析这种系统适用范围。

关键词：化学机械平坦化隔膜泵蠕动泵无轴承磁悬浮泵抛光液

在线全文

学校读者我要写书评

暂无评论

细纱机捻度变换齿轮设计

山东纺织工学院学报 1988年第2期 41-44页

作者：周国安荷泽市技工学校

用尽量少的变换齿轮,纺制尽量多的不同捻度纱线,且捻度差异率在允许范围以内,提出了设计捻度变换齿轮的理论,对于牵伸变换和锭速变换设计都具有广泛的统一适应性。

关键词：捻度齿轮

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Pareto杂波模型的参数估计性能研究

空军工程大学学报（自然科学版） 2018年第2期19卷 67-71页

作者：傅俊滔周国安陈红空军工程大学防空反导学院 61769部队

对于服从Pareto分布的杂波,采用一二阶矩估计法和估计法存在分布参数的有效估计范围受限的问题。基于估计法进行估计,推导出形状参数的有效估计区间为(r,+∞)。在此基础上,利用负数阶矩估计的思想进一步提出估计法,使形状参数的有效估... 详细信息

对于服从Pareto分布的杂波,采用一二阶矩估计法和估计法存在分布参数的有效估计范围受限的问题。基于估计法进行估计,推导出形状参数的有效估计区间为(r,+∞)。在此基础上,利用负数阶矩估计的思想进一步提出估计法,使形状参数的有效估计范围扩大到(0,+∞)。仿真实验表明,估计法将形状参数的有效估计范围扩大到整个取值区间。和其他几种估计法的估计性能相比,估计法的运行速度更快,在区间(0,1)上的估计性能更好,在实际工作中的应用范围更广泛。

关键词： Pareto分布杂波参数估计估计范围