检索结果-南通市图书馆

SYP-5 regulates meiotic thermotolerance in Caenorhabditis elegans

在线全文

学校读者我要写书评

暂无评论

Journal of Molecular Cell Biology 2021年第9期13卷 662-675页

作者： Yuanyuan Liu qiuchen zhao Hui Nie Fengguo Zhang Tingting Fu Zhenguo Zhang Feifei Qi Ruoxi Wang Jun Zhou Jinmin Gao Institute of Biomedical Sciences College of Life SciencesKey Laboratory of Animal Resistance Biology of Shandong ProvinceShandong Normal UniversityJinan 250014China

Meiosis produces the haploid gametes required by all sexually reproducing organisms,occurring in specific temperature ranges in different ***,how meiotic thermotolerance is regulated remains largely *** the model organism Caenorhabditis elegans,here,we identified the synaptonemal complex(SC)protein SYP-5 as a critical regulator of meiotic ***-5-null mutants maintained a high percentage of viable progeny at 20℃ but produced significantly fewer viable progeny at 25℃,a permissive temperature in wild-type *** analysis of meiotic events in the mutants revealed that while SC assembly and disassembly,as well as DNA double-strand break repair kinetics,were not affected by the elevated temperature,crossover designation,and bivalent formation were significantly *** severe homolog segregation errors were also observed at elevated temperature.A temperature switching assay revealed that late meiotic prophase events were not temperature-sensitive and that meiotic defects during pachytene stage were responsible for the reduced viability of syp-5 mutants at the elevated ***,SC polycomplex formation and hexanediol sensitivity analysis suggested that SYP-5 was required for the normal properties of the SC,and charge-interacting elements in SC components were involved in regulating meiotic ***,these findings provide a novel molecular mechanism for meiotic thermotolerance regulation.

关键词： meiosis thermotolerance synaptonemal complex crossover regulation Caenorhabditis elegans SYP-5

Large-area growth of ultra-high-density single-walled carbon nanotube arrays on sapphire surface

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

Nano Research 2015年第11期8卷 3694-3703页

作者： Lixing Kang Yue Hu Hua Zhong Jia Si Shuchen Zhang qiuchen zhao Jingjing Lin Qingwen Li Zhiyong Zhang Lianmao Peng Jin Zhang Division ofAdvanced Nanomaterials Suzhou Institute of Nanotech and Nanobionics Chinese Academy of Sciences Suzhou 215123 China Center for Nanochemistry Beijing Science and Engineering Technology Research Center for Low Dimensional Carbon Materials College of Chemistry and Molecular Engineering Peking University Beijing 100871 China University of ChineseAcademy of Sciences Beijing 100049 China 4 Key Laboratory for the Physics and Chemistry of Nanodevices Department of Electronics Peking University Beijing 100871 China Key Laboratory for the Physics and Chemistry of Nanodevices Department of Electronics Peking University Beijing 100871 China

A scalable approach to obtaining high-density, large-area single-walled carbon nanotube （SWNT） arrays is essential for realizing the full potential of SWNTs in practical electronic devices; this is still a great challenge. Here, we report an improved synthetic method for large-area growth of ultra-high-density SWNT arrays on sapphire surfaces by combining Trojan catalysts （released from the substrate, to assure ultra-high density） with Mo nanoparticles （loaded on the surface, to stabilize the released Trojan catalysts） as cooperating catalysts. Dense and perfectly aligned SWNTs covered the entire substrate and the local density was as high as 160 tubes/pro. Field-effect transistors （FETs） built on such arrays gave an output current density of -488 μA/μm at the drain-source voltage （Vds） = the gate-source voltage （Vgs） = -2 V, corresponding to an on-conductance per width of 244 μS/μm. These results confirm the wide range of potential applications of Trojan-Mo catalysts in the structure-controlled growth of SWNTs.

关键词： single-walled carbon nanotube arrays ultra-high density large area cooperating catalysts

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

高速铁路半封闭式声屏障降噪效果测试与分析

西南交通大学学报 2018年第4期53卷 661-669,755页

作者：李小珍赵秋晨张迅杨得旺西南交通大学土木工程学院四川成都610031

当前半封闭式声屏障逐渐在高速铁路工程中得到了应用,但其在运营状态下的实际降噪效果研究还极其有限.为此,以沪昆客专杭长段半封闭式声屏障为工程背景,分别在声屏障内、外表面,以及封闭侧和敞开侧不同距离处布置测点,监测高速列车通过... 详细信息

当前半封闭式声屏障逐渐在高速铁路工程中得到了应用,但其在运营状态下的实际降噪效果研究还极其有限.为此,以沪昆客专杭长段半封闭式声屏障为工程背景,分别在声屏障内、外表面,以及封闭侧和敞开侧不同距离处布置测点,监测高速列车通过时的噪声,并对场点的声压级频谱、声场分布、衰减规律、隔声量和插入损失等声学特性进行讨论.结果表明:多重反射造成的混响效应使得半封闭式声屏障内表面的噪声有所增大;距封闭侧线路中心7.5 m处,高位测点比低位测点声压级大,而其他位置不同高度测点在垂向的指向性不明显.半封闭式声屏障的隔声量随频率增加而增大,在1 000 Hz处最大约26 d B;距轨道中心线7.5 m和25 m处的插入损失均值为16.5 dB(A)和15.5 dB(A).

关键词：高速铁路半封闭式声屏障现场试验隔声量插入损失

在线全文

学校读者我要写书评

暂无评论

不同轨道结构形式对高架箱梁结构噪声的影响

土木工程学报 2018年第10期51卷 78-87,106页

作者：李小珍梁林赵秋晨王党雄西南交通大学四川成都610031

为探讨不同轨道结构形式对高架混凝土箱梁结构噪声的影响规律,在考虑多轮对相互作用影响的基础上,建立车辆-轨道耦合系统频域内分析模型及桥梁噪声统计能量仿真模型。以某城市轨道交通30m混凝土简支箱梁现场噪声试验为依据,对仿真分析... 详细信息

为探讨不同轨道结构形式对高架混凝土箱梁结构噪声的影响规律,在考虑多轮对相互作用影响的基础上,建立车辆-轨道耦合系统频域内分析模型及桥梁噪声统计能量仿真模型。以某城市轨道交通30m混凝土简支箱梁现场噪声试验为依据,对仿真分析模型进行验证。在此基础上,分别对埋入式轨枕、梯形轨枕及钢弹簧浮置板三种轨道结构形式下作用于箱梁的力、输入功率及箱梁结构噪声的频变规律进行了探讨。结果表明:仿真值与实测值吻合良好,能较好对箱梁结构噪声进行预测;输入到箱梁的总功率及子系统的功率取决于作用于箱梁的力;场点噪声的频变规律主要受箱梁输入功率的影响;轨道结构形式对箱梁噪声的影响较大,辐射总声级大小关系为:埋入式轨枕情况下最大,梯形轨枕情况下次之,钢弹簧浮置板情况下最小。

关键词：轨道结构形式箱梁结构噪声统计能量分析输入功率

Carbon nanotube: Controlled synthesis determines its future

在线全文

学校读者我要写书评

暂无评论

Science China Materials 2020年第1期63卷 16-34页

作者： Shuchen Zhang Liu Qian qiuchen zhao Zequn Wang Dewu Lin Weiming Liu Yabin Chen Jin Zhang Center for Nanochemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China

Carbon nanotubes(CNTs) have received broad attention in the past decades due to their excellent physical and chemical properties and thus been regarded as a powerful candidate for future star-materials. Although various CNT products and their related applications have been demonstrated recently, their performance can hardly meet the researchers’ expectations compared with their theoretical properties. The current predicament is caused by the immature synthesis method, including the basic science and the producing technology. As the synthesis with controlled structures determines its future, this review summarizes the progress on the basic research and industrialization of CNTs in the past decades, including the fine structure control, aggregation status design and scale-up production, and further points out the way for the future development of CNTs combining with specific applications.

关键词： carbon nanotubes structure-controlled synthesis scale-up synthesis applications

Combination BMSCs and Glycyrrhizin treatment of stroke inhibits the expression of HMGB1 and RAGE in diabetic rats

在线全文

学校读者我要写书评

暂无评论

Combination BMSCs and Glycyrrhizin treatment of stroke inhib...