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商业经济研究 2021年第16期 163-166页

作者：曹蓄温中共重庆市万州区委党校重庆404000

随着“新丝绸之路经济带”建设步伐的加快,我国农产品的进口重点逐渐由欧美转向丝路沿线诸国。近年来我国在丝路沿线各国的农产品进口额逐年快速增长,但与持续增长的农产品进口额相比,我国在丝路沿线的物流水平提升相对迟缓,故而物流绩... 详细信息

随着“新丝绸之路经济带”建设步伐的加快,我国农产品的进口重点逐渐由欧美转向丝路沿线诸国。近年来我国在丝路沿线各国的农产品进口额逐年快速增长,但与持续增长的农产品进口额相比,我国在丝路沿线的物流水平提升相对迟缓,故而物流绩效日益成为影响我国农产品进口的重要因素。因此,本文选取我国在2008-2019年间与丝路沿线20个农产品贸易国之间的进口数据作为研究样本,构建回归方程对物流绩效如何影响我国农产品进口进行了测度,旨在明确物流绩效的影响机制以促进我国农产品进口贸易的发展。结果表明:“新丝绸之路经济带”中大多数国家的国际物流水平发展不平衡且质量不高,总体来看尚处于上升阶段;国家物流绩效指数对于农产品进口贸易有着显著影响,且国家物流绩效指数下各分项指标对农产品进口贸易的影响有着显著的差异性,其中物流基础设施建设的程度对其影响最大。

关键词：物流绩效农产品进口 “新丝绸之路经济带” 引力模型物流水平

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Cascade nanozymatic network mimicking cells with selective and linear perception of H2O2

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CHEMICAL SCIENCE 2023年第24期14卷 6780-6791页

作者： Zhu, Caixia Zhou, Zhixin Gao, Xuejiao J. Tao, Yanhong cao, xuwen Xu, Yuan Shen, Yanfei Liu, Songqin Zhang, Yuanjian Southeast Univ Sch Chem & Chem Engn Med Sch Jiangsu Engn Lab Smart Carbon Rich Mat & DeviceJi Nanjing Peoples R China Jiangxi Normal Univ Coll Chem & Chem Engn Nanchang 330022 Peoples R China

A single stimulus leading to multiple responses is an essential function of many biological networks, which enable complex life activities. However, it is challenging to duplicate a similar chemical reaction network (CRN) using non-living chemicals, aiming at the disclosure of the origin of life. Herein, we report a nanozyme-based CRN with feedback and feedforward functions for the first time. It demonstrates multiple responses at different modes and intensities upon a single H2O2 stimulus. In the two-electron cascade oxidation of 3,3 ',5,5 '-tetramethylbenzidine (TMB), the endogenous product H2O2 competitively inhibited substrates in the first one-electron oxidation reaction on a single-atom nanozyme (Co-N-CNTs) and strikingly accelerated the second one-electron oxidation reaction under a micellar nanozyme. As a proof-of-concept, we further confined the nanozymatic network to a microfluidic chip as a simplified artificial cell. It exhibited remarkable selectivity and linearity in the perception of H2O2 stimulus against more than 20 interferences in a wide range of concentrations (0.01-100 mM) and offered an instructive platform for studying primordial life-like processes.

关键词： Oxidation

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RETRACTED: An Empirical Study on the Relationship between New Energy Vehicle' Export Sophistication and Industrial Structure Upgrading in China (Retracted Article)

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JOURNAL OF ENVIRONMENTAL AND PUBLIC HEALTH 2022年第1期2022卷

作者： cao, xuwen Rasiah, Rajah Furuoka, Fumitaka Univ Malaya Asia Europe Inst Kuala Lumpur Malaysia

Following decades of reducing greenhouse gas emissions in the transportation industry, most car companies will stop producing petrol cars and promote the development of new energy vehicles in the near future, even in China. This study is based on energy vehicle exports using China's 31 provinces' panel data from 2010 to 2020. Considering that China mainly engages in processing trade, this study analyzes the domestic energy vehicle's export sophistication after deleting intermediate goods, measuring the relationship between export sophistication and industrial upgrading with static and dynamic panel models. Then, heterogeneity tests were deployed to examine the domestic export sophistication of three major economic belts partition. The results revealed that improving export sophistication is conducive to realizing China's industrial upgrading. China's new energy vehicles industry is positively affected by export sophistication, R&D, foreign direct investment, average GDP growth rate, market factors, and human resources over the long run. Regarding regional stratification, domestic export sophistication in the eastern and western regions has more significant effects on promoting industrial upgrading than in the central region. In particular, in western regions, every increase in export sophistication by one unit will bring a significant industrial upgrading effect. Given this, China's new energy vehicles should increase export sophistication to help the country's industrial upgrading.

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Mechanisms of acetylcholine receptor gene eat-2 in regulating the development of ***

Mechanisms of acetylcholine receptor gene eat-2 in regulatin...

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第五届中国秀丽线虫大会

作者： xuwen cao Yusu Xie Pengchi Zhang Liusuo Zhang CAS Key Laboratory of Experimental Marine Biology Institute of OceanologyChinese Academy of Sciences Laboratory for Marine Biology and Biotechnology Qingdao National Laboratory for Marine Science and Technology Center for Ocean Mega-Science Chinese Academy of Sciences University of Chinese Academy of Sciences

＜正＞How the amount and nutritional composition of diets influence organismal development,fecundity and health are largely *** axenic chemically defined food *** maintenance medium（CeMM） is a powerful experiment material to study the impact of diet and nutrition on life-history traits such as growth and *** studies have shown that the eat-2 gene,

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Elucidating Orbital Delocalization Effects on Boosting Electrochemiluminescence Efficiency of Carbon Nitrides

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ADVANCED OPTICAL MATERIALS 2022年第18期10卷

作者： Fang, Yanfeng Hou, Yuhua Yang, Hong Chen, Ran Li, Wang Ma, Jin Han, Dan cao, xuwen Liu, Songqin Shen, Yanfei Zhang, Yuanjian Southeast Univ Jiangsu Engn Lab Smart Carbon Rich Mat & Device Jiangsu Prov Hitech Key Lab Biomed Res State Key Lab BioelectSch Chem & Chem Engn Nanjing 211189 Peoples R China Southeast Univ Med Sch Nanjing 211189 Peoples R China

Highly efficient inter-conversion of different types of energy is the core of science and technology. Among them, electrochemiluminescence (ECL), an emission of light excited by electrochemical reactions, has drawn attention as a powerful tool across diverse fields in addressing global energy, environment, and health challenges. Nonetheless, the ECL efficiency (phi(ECL)) of most luminophores in aqueous solutions is low, significantly hampering their broad applications. Along this line, developing ECL luminophores with high phi(ECL) and understanding the associated intrinsic factors is highly envisioned. Herein, taking carbon nitride (CN) with rigid 2D backbones as an emerging model luminophore, it is reported that the orbital delocalization is a unified and quantifiable factor for its phi(ECL). Behind the complicated transformation of molecular structures of cyano-terminal groups and triazine/heptazine basal frameworks, the orbital delocalization of CN is found to be generally improved at an elevated condensation temperature. Such intrinsic evolution in electronic structure favored the electron injection in excitation and follow-up photon emission in ECL for CN. As a result, the cathodic phi(ECL) of CN is remarkably improved to a new milestone of 24-fold greater than the previous record.

关键词： carbon nitrides electrochemiluminescence energy conversion efficiency orbital delocalization photoelectrochemistry

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CRISPR/Cas9基因编辑技术在线虫中的应用进展和展望

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中国科学：生命科学 2018年第5期48卷 513-520页

作者：曹绪文张留所中国科学院海洋研究所实验海洋生物学重点实验室青岛266071 青岛海洋科学与技术国家实验室海洋生物学与生物技术功能实验室青岛266237 中国科学院大学北京100049

线虫属于线虫动物门,从陆地到海洋,从浅海到深海,线虫可以生存于几乎所有可栖息环境,是地球上数量最多的多细胞动物.线虫中不仅有生物医学研究领域的明星模式生物秀丽线虫(Caenorhabditis elegans),还包括对海洋生态环境具有重要意义的... 详细信息

线虫属于线虫动物门,从陆地到海洋,从浅海到深海,线虫可以生存于几乎所有可栖息环境,是地球上数量最多的多细胞动物.线虫中不仅有生物医学研究领域的明星模式生物秀丽线虫(Caenorhabditis elegans),还包括对海洋生态环境具有重要意义的自由生活海洋线虫,以及引起人类、牲畜和农作物寄生虫病的寄生线虫等.近几年来,CRISPR/Cas9基因编辑技术的快速发展和广泛应用,带动了生命科学研究技术的革命.CRISPR/Cas9技术具有易构建、成本低、靶点广、效率高的优点,很快就成为了研究者不可缺少的实验工具.利用CRISPR/Cas9基因编辑技术研究线虫领域的重要科学问题,将加速人们对基因功能和重要生命过程规律的深入解析,并大大促进与线虫紧密关联的人类健康、产业经济和生态环境等领域的发展.本文总结了近期CRISPR/Cas9基因编辑技术在秀丽线虫以及其他线虫中应用的一些重要进展,并对其应用前景和未来的热点研究领域进行展望.

关键词：线虫 CRISPR/Cas9 基因编辑基因敲除基因敲入

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Growth of Robust Carbon Nitride Films by Double Crystallization with Exceptionally Boosted Electrochemiluminescence for Visual DNA Detection

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ADVANCED OPTICAL MATERIALS 2023年第6期11卷

作者： Hou, Yuhua Fang, Yanfeng Zhou, Zhixin Hong, Qing Li, Wang Yang, Hong Wu, Kaiqing Xu, Yuan cao, xuwen Han, Dan Liu, Songqin Shen, Yanfei Zhang, Yuanjian Southeast Univ Sch Chem & Chem Engn Jiangsu Engn Lab Smart Carbon Rich Mat & Device Jiangsu Prov Hitech Key Lab Biomed ResState Key L Nanjing 211189 Peoples R China Southeast Univ Med Sch Nanjing 210009 Peoples R China

Electrochemically generated chemiluminescence (ECL) has attracted significant interest over the past decades, ranging from fundamental studies on highly efficient electron-to-photon interconversion to practical bioassays. Nonetheless, the ECL efficiency (phi(ECL)) of most emitters is low, which significantly hampers further development. Herein, this work reports a highly robust carbon nitride film with unusually enhanced ECL efficiency (2256 times higher than that of the reference Ru(bpy)(3)Cl-2/K2S2O8). Double crystallization, which provides the primary interaction of carbon nitride with the substrate and subsequent growth, plays a crucial role in the preparation. The improved ECL efficiency is ascribed to little pinholes suppressing futile co-reagent reduction, maintenance of more orbit-delocalized heptazine subunits improving ECL kinetics, and high transparency avoiding self-absorption. As a potential application, an ultrasensitive visual DNA biosensor by the naked eye is further successfully developed with a linear detection range of 100 pm to 1 mu m and limit of detection of 27 pm (S/N = 3).

关键词： biosensors carbon nitrides electrochemiluminescence energy conversion mechanical properties

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Adaptable graphitic C6N6-based copper single-atom catalyst for intelligent biosensing

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NATURE COMMUNICATIONS 2023年第1期14卷 1-11页

作者： Hong, Qing Yang, Hong Fang, Yanfeng Li, Wang Zhu, Caixia Wang, Zhuang Liang, Sicheng cao, xuwen Zhou, Zhixin Shen, Yanfei Liu, Songqin Zhang, Yuanjian Southeast Univ Sch Chem & Chem Engn Jiangsu Engn Lab Smart Carbon Rich Mat & Device Jiangsu Prov Hitech Key Lab Biomed Res Nanjing 211189 Peoples R China Southeast Univ Med Sch Nanjing 210009 Peoples R China

Self-adaptability is highly envisioned for artificial devices such as robots with chemical noses. For this goal, seeking catalysts with multiple and modulable reaction pathways is promising but generally hampered by inconsistent reaction conditions and negative internal interferences. Herein, we report an adaptable graphitic C6N6-based copper single-atom catalyst. It drives the basic oxidation of peroxidase substrates by a bound copper-oxo pathway, and undertakes a second gain reaction triggered by light via a free hydroxyl radical pathway. Such multiformity of reactive oxygen-related intermediates for the same oxidation reaction makes the reaction conditions capable to be the same. Moreover, the unique topological structure of CuSAC6N6 along with the specialized donor-pi-acceptor linker promotes intramolecular charge separation and migration, thus inhibiting negative interferences of the above two reaction pathways. As a result, a sound basic activity and a superb gain of up to 3.6 times under household lights are observed, superior to that of the controls, including peroxidase-like catalysts, photocatalysts, or their mixtures. CuSAC6N6 is further applied to a glucose biosensor, which can intelligently switch sensitivity and linear detection range in vitro. Catalysts with multiple and modulable reaction pathways are promising but generally hampered by inconsistent reaction conditions and negative internal interferences. Herein, the authors report an adaptable graphitic C6N6-based copper singleatom catalyst

关键词： Bioanalytical chemistry Biocatalysis Materials for energy and catalysis

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Stratum Corneum-Inspired Zwitterionic Hydrogels with Intrinsic Water Retention and Anti-Freezing Properties for Intelligent Flexible Sensors

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ADVANCED FUNCTIONAL MATERIALS 2025年第0期

作者： Wu, Meng Qiao, Chenyu Sui, Peng-Fei Luo, Jing-Li Li, Zuoli cao, Yi Pei, Renjun Peng, xuwen Zeng, Hongbo Chinese Acad Sci Suzhou Inst Nanotech & Nanobion CAS Key Lab Nanobio Interface Suzhou 215123 Peoples R China Univ Alberta Dept Chem & Mat Engn Edmonton AB T6G 1H9 Canada Tsinghua Univ Dept Chem Engn Beijing 10084 Peoples R China

Hydrogels, which mimic the properties of natural tissues, are essential for flexible electronics in human-machine interfaces (HMIs). However, traditional hydrogels suffer from dehydration, compromising stability and functionality. To address this issue, a stratum corneum-inspired, water-retaining hydrogel is developed using hygroscopic polymers and bound water. Three types of hydrophilic monomers (non-ionic, mono-ionic, and zwitterionic) are explored, with polyzwitterions, particularly N,N-dimethyl (acrylamidopropyl) ammonium propane sulfonate (DMAAPS), forming a quasi-hydrogel that retains the softness and flexibility of conventional hydrogels. Water acts as a plasticizer, enhancing polymer chain mobility and reducing stiffness. The DMAAPS hydrogel maintains 100% weight retention under specific humidity conditions and shows skin-like softness across a wide humidity range. The Young's modulus increases from 54 to 118 kPa as relative humidity decreases from 80% to 40%. The absence of free water confers intrinsic anti-freezing properties. A triple crosslinking mechanism and conductive polymers endow the hydrogel with stretchability (> 2000%), toughness, elasticity, self-healing, and stable sensing capabilities. The hydrogel functions as an excellent flexible sensor for real-time, sensitive detection of human motion and physiological signals. An intelligent handwriting recognition platform with high accuracy is also established using double-channel signal collection and machine learning algorithms, offering insights for next-generation durable, biomimetic, and smart HMIs.

关键词： anti-freezing flexible sensors self-healing stratum corneum-inspired materials water retention wearable electronics Zwitterionic hydrogels

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煤矿井下采煤工作面顶板管理问题分析

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现代矿业 2020年第2期36卷 233-234,236页

作者：曹旭文潞安集团司马煤业有限公司

井下安全事故是目前我国煤矿生产面临的巨大隐患之一,其中井下工作面顶板事故最为普遍。因此,采煤工作面顶板的安全问题应列为煤矿企业生产中的安全重点进行管理。同煤同忻矿地下煤矿安全运行数十年来,未曾因为顶板问题引发安全事故,在... 详细信息

井下安全事故是目前我国煤矿生产面临的巨大隐患之一,其中井下工作面顶板事故最为普遍。因此,采煤工作面顶板的安全问题应列为煤矿企业生产中的安全重点进行管理。同煤同忻矿地下煤矿安全运行数十年来,未曾因为顶板问题引发安全事故,在顶板安全管理中积累了丰富经验,为减少同煤同忻煤矿安全事故,以该矿的顶板管理为背景,分析了引起顶板事故原因、隐患排查和事故预防的基本方法,为类似条件矿山提供有益参考。

关键词：煤矿安全事故顶板事故预防

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