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Controllable synthesis of a large TS-1 catalyst for clean epoxidation of a C=C double bond under mild conditions

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Frontiers of Chemical Science and Engineering 2023年第6期17卷 772-783页

作者： Xiu Gao Beining Luo Yanping Hong Peihang He Zedong Zhang guoqiang wu Jiangxi Key Laboratory of Natural Products and Functional Food Jiangxi Agricultural UniversityNanchang 330045China School of Food Science and Engineering Jiangxi Agricultural UniversityNanchang 330045China

Development of a titanium silicalite-1(TS-1)catalyst with good crystallinity and a four-coordinate Ti framework is critical for efficient catalytic oxidation reaction under mild conditions.Herein,a size-controlled TS-1 zeolite(TS-10.1ACh(acetylcholine))was synthesized via steam-assisted crystallization by introducing acetylcholine as a crystal growth modifier in the preparation process,and TS-10.1ACh was also employed in epoxidations of different substrates containing C=C double bonds.The crystalline sizes of the as-synthesized TS-10.1ACh catalysts were controlled with the acetylcholine content,and characterization results showed that the particle sizes of highly crystalline TS-10.1ACh zeolite reached 3.0μm with a good Ti framework.Throughout the synthetic process,the growth rate of the crystals was accelerated by electrostatic interactions between the connected hydroxyl groups of the acetylcholine modifier and the negatively charged skeleton of the pre-zeolites.Furthermore,the TS-10.1ACh catalyst demonstrated maximum catalytic activity,good selectivity and high stability during epoxidation of allyl chloride.Importantly,the TS-10.1ACh catalyst was also highly versatile and effective with different unsaturated substrates.These findings may provide novel,easily separable and large TS-1 catalysts for efficient and clean industrial epoxidations of C=C double bonds.

关键词： size-controlled TS-1 crystal modifier steam-assisted crystallization epoxidation

Studying bona fide SARS-CoV-2 biology in a BSL-2 biosafety environment using a split-virus-genome system

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Science China(Life Sciences) 2022年第9期65卷 1894-1897页

作者： Yingxin Ma Guobin Mao Weishan Yang guoqiang wu guoqiang Li Xiaoying Li Xin Lin Junnan Lu Shijun Zhao Wei Zhao Junbiao Dai Xian-En Zhang CAS Key Laboratory of Quantitative Engineering Biology Guangdong Provincial Key Laboratory of Synthetic Genomics and Shenzhen Key Laboratory of Synthetic GenomicsShenzhen Institute of Synthetic BiologyShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China University of Chinese Academy of Sciences Beijing 100049China Faculty of Synthetic Biology Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China National Key Laboratory of Biomacromolecules CAS Center for Biological MacromoleculesInstitute of BiophysicsChinese Academy of SciencesBeijing 100101China

Dear Editor,Severe acute respiratory syndrome coronavirus 2(SARSCoV-2)was identified as the pathogen causing the coronavirus disease(COVID-19),which sometimes resulted in fatal pneumonia(Hu et al.,2021).SARS-CoV-2 is a biosafety level 3(BSL-3)pathogen,and the requirement for high containment conditions is a bottleneck for basic research on viral biology.To help general researchers who wish to study SARS-CoV-2 but do not have access to a BSL-3 facility,a system that(1)can mimic the real life cycle of the virus;(2)allows easy genetic manipulation;and(3)shows high biosafety in BSL-2 laboratory is required.

关键词： al. acute respiratory

WRKY转录因子调控植物逆境胁迫响应的作用机制

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生物工程学报 2024年第1期40卷 35-52页

作者：王淑叶伍国强魏明兰州理工大学生命科学与工程学院甘肃兰州730050

WRKYs是植物中特有的一类转录因子(transcription factor,TF)家族,属于典型的多功能调节因子,可参与调控多种信号途径。该类转录因子的显著特征是含有约由60个高度保守的氨基酸构成的WRKY结构域,通常还具有Cys2His2或Cys2His-Cys型锌指... 详细信息

WRKYs是植物中特有的一类转录因子(transcription factor,TF)家族,属于典型的多功能调节因子,可参与调控多种信号途径。该类转录因子的显著特征是含有约由60个高度保守的氨基酸构成的WRKY结构域,通常还具有Cys2His2或Cys2His-Cys型锌指结构。WRKYs可与下游靶标基因启动子区域的W-box序列[(T)(T)TGAC(C/T)]相结合,或通过与靶标蛋白相互作用来激活或抑制靶基因的转录,整合脱落酸(abscisic acid,ABA)、活性氧(reactive oxygen species,ROS)等信号通路诱导胁迫相关基因表达,从而调控逆境胁迫应答。本文综述了WRKYs的结构和分类、调控方式及其参与干旱、盐等逆境胁迫响应的分子机制等方面的研究成果,并对其未来研究方向进行展望,以期为农作物抗逆性遗传改良提供理论支持。

关键词： WRKYs 逆境胁迫靶标基因蛋白互作基因表达

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豆科牧草抗逆基因工程研究进展

草业科学 2024年第1期41卷 178-194页

作者：朱雅欣伍国强魏明兰州理工大学生命科学与工程学院甘肃兰州730050

豆科牧草是饲草的重要组成部分,也是支撑畜牧业发展、尤其是乳产业的重要基础。我国豆科牧草育种研究基础薄弱,干草和优质草种依赖进口,是我国畜牧业发展的短板之一。因此,加强豆科牧草的育种,尤其是当前发展迅速的生物技术育种,是促进... 详细信息

豆科牧草是饲草的重要组成部分,也是支撑畜牧业发展、尤其是乳产业的重要基础。我国豆科牧草育种研究基础薄弱,干草和优质草种依赖进口,是我国畜牧业发展的短板之一。因此,加强豆科牧草的育种,尤其是当前发展迅速的生物技术育种,是促进我国草业发展和“弯车道超车”的重要途径。由于我国优质土地主要用于粮食生产,畜牧业主要分布在自然气候条件恶劣的地区,因此,我国草产业对抗逆性强的优质牧草品种极其依赖。鉴于生物技术育种的巨大潜力,本文就豆科牧草组织培养体系、遗传转化方法及近年来豆科牧草在抗生物、非生物胁迫等方面的研究成果加以综述,并对未来研究方向进行展望。

关键词：紫花苜蓿红豆草盐胁迫转录因子离子转运蛋白基因克隆过量表达

A Note on Obata’s Rigidity Theorem

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Communications in Mathematics and Statistics 2014年第3期2卷 231-252页

作者： guoqiang wu Rugang Ye Department of Mathematics University of Science and Technology of ChinaHefeiChina Department of Mathematics UCSBSanta BarbaraCA 93106USA

In this note we present various extensions of Obata’s rigidity theorem concerning the Hessian of a function on a Riemannian manifold.They include general rigidity theorems for the generalized Obata equation,and hyperbolic and Euclidean analogs of Obata’s theorem.Besides analyzing the full rigidity case,we also characterize the geometry and topology of the underlying manifold in more general situations.

关键词： Obata rigidity Hessian Sphere theorems Warped product metric

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农药行业竞争论

农药科学与管理 2024年第5期45卷 1-6页

作者：吴国强农业农村部农药检定所北京100125

本文从国民经济发展的视角,系统分析了目前农药行业市场竞争的特点,提出了企业直面挑战、及时应对的战略建议。

关键词：农药行业竞争

预制拼接整体式条形基础及整体式支架体系设计与施工研究

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江西建材 2024年第1期 265-267页

作者：吴国强中国铁建港航局集团有限公司第一工程分公司广东广州511442

文中以广州新白云国际机场第二高速公路南段工程SG01标段为例,对预制拼接整体式条形基础及整体式支架体系深入分析。实践表明,本工程桥梁临时支墩结构采用“预制拼接整体式条形基础及整体式支架体系”均能满足规范要求,该施工方法在后... 详细信息

文中以广州新白云国际机场第二高速公路南段工程SG01标段为例,对预制拼接整体式条形基础及整体式支架体系深入分析。实践表明,本工程桥梁临时支墩结构采用“预制拼接整体式条形基础及整体式支架体系”均能满足规范要求,该施工方法在后场提前加工,施工时运输至施工现场,快速拼装可重复利用,缩短占道施工周期,保证施工安全,降低交通疏解成本。文中所提出的预制拼接整体式条形基础及整体式支架体系,应用效果良好,可为类似工程提供参考。

关键词：整体式预制拼接条形基础支架体系

High Thermoelectric Performance of Cu-Doped PbSe-PbS System Enabled by High-Throughput Experimental Screening

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Research 2020年第1期2020卷 166-173页

作者： Li You Zhili Li Quanying Ma Shiyang He Qidong Zhang Feng Wang guoqiang wu Qingyi Li Pengfei Luo Jiye Zhang Jun Luo School of Materials Science and Engineering Shanghai University99 Shangda RoadShanghai 200444China Materials Genome Institute Shanghai University99 Shangda RoadShanghai 200444China

Recent advances in high-throughput(HTP)computational power and machine learning have led to great achievements in exploration of new thermoelectric materials.However,experimental discovery and optimization of thermoelectric materials have long relied on the traditional Edisonian trial and error approach.Herein,we demonstrate that ultrahigh thermoelectric performance in a Cu-doped PbSe-PbS system can be realized by HTP experimental screening and precise property modulation.Combining the HTP experimental technique with transport model analysis,an optimal Se/S ratio showing high thermoelectric performance has been efficiently screened out.Subsequently,based on the screened Se/S ratio,the doping content of Cu has been subtly adjusted to reach the optimum carrier concentration.As a result,an outstanding peak zT~1:6 is achieved at 873 K for a 1.8 at%Cu-doped PbSe_(0.6)S_(0.4) sample,which is the superior value among the n-type Te-free lead chalcogenides.We anticipate that current work will stimulate large-scale unitization of the HTP experimental technique in the thermoelectric field,which can greatly accelerate the research and development of new high-performance thermoelectric materials.

关键词： materials. precise doping

High-performance Sb:SnO_2 Compact Thin Film Based on Surfactant-free and Binder-free Sb:Sn_3O_4 Suspension

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Journal of Materials Science & Technology 2015年第8期31卷 815-821页

作者： Junhua Zhao Ruiqin Tan Ye Yang Wei Xu Jia Li Wenfeng Shen guoqiang wu Xufeng Yang Weijie Song College of Chemical and Material Engineering Quzhou University Faculty of Information Science and Engineering Ningbo University Ningbo Institute of Material Technology and Engineering Chinese Academy of Sciences

Surfactant-free and binder-free antimony-doped tin oxide （ATO） transparent conducting thin films were fabricated through spin coating and rapid annealing processes, in which nanosheets were assembled into a compact structure via self-contracting high pressure. The mechanism of this compact thin film for- mation was further proposed and analyzed. The compact ATO thin film had a low root mean square （RMS） roughness of 5.03 nm. This surfactant-free and binder-free compact ATO thin film delivered low resistivity of 3.04 × 10^-2 Ω cm, stable resistivity which only increased 13% after exposing in 65% RH air for half a month, high transmittance of 92.70% at 550 nm, and high band gap energy of 4.07 eV. This effective strategy will provide new insight into the synthesis of low-cost and high-performance compact thin films.

关键词： Antimony doped tin oxide Compact thin film Sn3O4 suspension Electrical properties Optical properties