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Enhanced debromination of 2,2’,4,4’-tetrabromodiphenyl ether(BDE-47)by zero-valent zinc with ascorbic acid

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Frontiers of Environmental Science & Engineering 2020年第3期14卷 127-139页

作者： Chaojin jiang xiaoqian jiang Lixun Zhang Yuntao Guan Guangdong Provincial Engineering Technology Research Center for Urban Water Cycle and Water Environment Safety Tsinghua Shenzhen International Graduate SchoolShenzhen 518055China State Environmental Protection Key Laboratory of Microorganism Application and Risk Control School of EnvironmentTsinghua UniversityBeijing 100084China

A new technique of zero-valent zinc coupled with ascorbic acid(ZVZ/AA)was developed and applied to debrominate the 2,2,,4,4,-Tetrabromodiphenyl ether(BDE-47),which achieved high conversion and rapid debromination of BDE-47 to less-or non-toxic *** reaction conditions were optimized by the addition of 100 mg/L Z V Z particles and 3 mmol/L A A at original solution p H=4.00 using the solvent of methanol/H2O(v:v=4:6),which could convert approximately 94%of 5 mg/L BDE-47 into lower-brominated diphenyl ethers within a 90 min at the ZVZ/AA *** high debromination of BDE-47 was mainly attributed to the effect of A A that inhibits the formation of Zn(Ⅱ)(hydr)oxide passivation layers and promotes the corrosion of ZVZ,which leads to increase the reactivity of ***,ion chromatography and gas chromatography mass spectrometry analyses revealed that bromine ion and lower-debromination diphenyl ethers formed during the reduction of ***,based on the generation of the intermediates products,and its concentration changes over time,it was proposed that the dominant pathway for conversion of BDE-47 was sequential debromination and the final products were diphenyl *** results suggested that the ZVZ/AA system has the potential for highly efficient debromination of BDE-47 from wastewater.

关键词： 2,2,,4,4,-tetrabromodiphenyl ether(BDE-47) Ascorbic acid Reductive debromination Zero-valent zinc

Highly responsive biosensors based on organic field-effect transistors under light irradiation

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Chinese Chemical Letters 2021年第11期32卷 3364-3367页

作者： xiaoqian jiang Chenfang Sun Congcong Zhang Shanshan Cheng Department of Chemistry Tianjin Key Laboratory of Molecular Optoelectronic Sciences School of ScienceTianjin UniversityTianjin 300072China Institute for Advanced Interdisciplinary Research University of JinanJi'nan 250011China

High responsivity and sensitivity play essential roles in the development of organic field-effect transistors(OFETs)-based biosensors with regard to biological detections,particularly for disease ***,how to design a biosensor which improves these two outstanding properties while achieving low cost,easy processing,and time saving is a daunting ***,a novel biosensor based on OFET with copolymer thin film,whose surface is illuminated with a suitable light beam is *** film can be used as both an organic semiconductor material and as a photoelectric active *** to amplification of signals as a result of the film’s strong response to light,the biosensor possesses higher responsivity and sensitivity compared to dark condition and even realizes a maximum responsivity of up to 10^(3)for alpha-fetoprotein(AFP)*** simple combination of light and transistor builds a bridge between photoelectric effect and biological *** addition,the emergence of more excellent photoelectric active materials is expected to pave a way for ultrasensitive bio-chemical diagnostic tools.

关键词： Organic field-effect transistors Photoelectric active materials Photo response Biosensors Disease diagnosis

基于网络药理学探究盐敷方治疗膝骨关节炎的作用机制

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医学理论与实践 2024年第7期37卷 1093-1096,1108页

作者：江晓倩张玉琴滕海英福建中医药大学附属康复医院福建省福州市350003 福建中医药大学

目的:探讨盐敷方组方治疗膝骨关节炎可能的作用机制。方法:运用中药系统药理学数据库与分析平台(TCMSP)筛选盐敷方的活性成分及其对应的靶点基因,并用UniProt数据库对基因名进行校正,通过Disgenet和Drugbank数据库获取膝骨关节炎的疾病... 详细信息

目的:探讨盐敷方组方治疗膝骨关节炎可能的作用机制。方法:运用中药系统药理学数据库与分析平台(TCMSP)筛选盐敷方的活性成分及其对应的靶点基因,并用UniProt数据库对基因名进行校正,通过Disgenet和Drugbank数据库获取膝骨关节炎的疾病靶点,并得到盐敷方与膝骨关节炎的共同靶点,利用Cytoscape3.10.0软件绘制“盐敷方成分靶点网络图”,利用String数据库构建盐敷方与膝骨关节炎共同靶点PPI网络,利用Cytoscape数据库进行GO及KEGG富集分析。结果:(1)共筛选出盐敷方活性成分86个及活性成分作用靶点255个;(2)与疾病的交集靶点共有51个,核心靶点为TNF、IL-6、IL-1β、ALB、PTGS2等;(3)GO分析结果共涉及882个生物学过程(BP)、26种细胞成分(CC)、78个分子功能(MF);(4)KEGG分析结果显示,盐敷方治疗膝骨关节炎的信号通路主要有IL-17、肿瘤坏死因子、类风湿关节炎、核因子κB等信号通路。结论:盐敷方可通过下调细胞因子表达、抑制炎症反应、减慢软骨降解退变等途径来延缓膝骨关节炎的发展。

关键词：盐敷方膝骨关节炎网络药理学信号通路作用机制

Phosphorus speciation and colloidal phosphorus responses to short-term cessation of fertilization in a lime concretion black soil

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Pedosphere 2023年第6期33卷 948-959页

作者： Shanshan BAI Jinfang TAN Zeyuan ZHANG Mi WEI Huimin ZHANG xiaoqian jiang School of Agriculture Sun Yat-sen UniversityGuangzhou 510275China Shenzhen Campus of Sun Yat-sen University Shenzhen 518107China Modern Agricultural Innovation Center Henan Institute of Sun Yat-sen UniversityZhumadian 463400China Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences/National Engineering Laboratory for Improving Quality of Arable LandBeijing 100081China

Long-term excessive application of mineral fertilizer has led to soil acidification and phosphorus(P) accumulation, increasing the risk of P loss and environmental pollution, and cessation of fertilization is widely considered as a cost-effective management strategy to relieve this situation;however, how such cessation influences P speciation and concentrations in a bulk soil and colloidal fractions and whether decreasing P concentration might maintain soil fertility remain unclear. In this study, the effects of long-term fertilization(ca. 40 years) and short-term cessation of fertilization(ca. 16 months) on inorganic, organic,and colloidal P in lime concretion black soil were investigated using P sequential fractionation and31P nuclear magnetic resonance spectroscopy. After long-term fertilization, available P, dicalcium phosphate, iron-bound P, orthophosphate monoesters, and orthophosphate diesters increased significantly, but soil p H decreased by ca. 2.8 units, indicating that long-term fertilization caused soil acidification and P accumulation and changed P speciation markedly. In contrast, short-term fertilization cessation increased soil p H by ca. 0.8 units and slightly reduced available and inorganic P. Available P after fertilization cessation was 22.9–29.8 mg kg-1, which was still sufficient to satisfy crop growth requirements. Additionally, fertilization cessation increased the proportions of fine colloids(100–450 nm, including nontronite and some amorphous iron oxides) and drove a significant release of iron/aluminum oxide nanoparticles(1–100 nm) and associated P with orthophosphate and pyrophosphate species. In summary, short-term fertilization cessation effectively alleviated soil acidification and inorganic P accumulation, while concomitantly maintaining soil P fertility and improving the potential mobilization of P associated with microparticles.

关键词： Fe/Al oxide nanoparticles fine colloids P accumulation 31pP nuclear magnetic resonance P sequential fractionation soil acidification

供排水系统中全氟和多氟烷基化合物(PFAS)的检测与去除研究进展

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净水技术 2024年第8期43卷 31-39,134页

作者：蒋晓倩郭俊敏田川杨芳魏锦程住房城乡建设部饮用水安全保障工程技术创新中心北京100044 中国城市规划设计研究院北京100044

随着工业的发展,全氟和多氟烷基化合物(PFAS)在日常生活和生产中的应用日益广泛,对水环境的影响呈加剧趋势。由于PFAS良好的水溶性,其可以随着水循环在环境中迁移转化,最终对人体健康产生不利影响。因此,中国和欧美国家已着手制定相关... 详细信息

随着工业的发展,全氟和多氟烷基化合物(PFAS)在日常生活和生产中的应用日益广泛,对水环境的影响呈加剧趋势。由于PFAS良好的水溶性,其可以随着水循环在环境中迁移转化,最终对人体健康产生不利影响。因此,中国和欧美国家已着手制定相关标准和法律法规,以限制PFAS的使用。在系统性总结水环境中PFAS的来源、浓度和转化过程的基础上,文章对比了色谱法、总可氧化前体(TOP)法和传感器等检测方法以及传统物化生方法、高级氧化技术以及焚烧工艺等去除技术,旨在为PFAS的监测与控制提供理论支持。结果表明,饮用水中PFAS质量浓度普遍超过0.1 ng/L,且PFAS在供排水处理过程中的去除存在两大局限:一是检测技术仅能覆盖少数PFAS类型;二是目前的去除方法无法彻底消除PFAS风险,或导致去除率差,或转化为短链氟化物,引发更多潜在环境风险。

关键词：全氟和多氟烷基化合物(PFAS) 供排水水处理色谱法高级氧化技术光催化氧化

Testing Cross-Talk Induced Delay Faults in Digital Circuit Based on Transient Current Analysis

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Wuhan University Journal of Natural Sciences 2006年第6期11卷 1445-1448页

作者： WANG Youren DENG xiaoqian CUI jiang YAO Rui ZHANG Zhai College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 Jiangsu China

The delay fault induced by cross-talk effect is one of the difficult problems in the fault diagnosis of digital circuit. An intelligent fault diagnosis based on IDDT testing and support vector machines （SVM） classifier was proposed in this paper. Firstly, the fault model induced by cross-talk effect and the IDDT testing method were analyzed, and then a delay fault localization method based on SVM was presented. The fault features of the sampled signals were extracted by wavelet packet decomposition and served as input parameters of SVM classifier to classify the different fault types. The simulation results illustrate that the method presented is accurate and effective, reaches a high diagnosis rate above 95%.

关键词： delay fault cross-talk fault localization digital circuit IDDT SVM

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SNX9基因敲除小鼠模型的构建及表型分析

西南医科大学学报 2024年第4期47卷 300-305页

作者：林恒蒋晓倩胥元博潘宗岳任洋杨朝鲜西南医科大学基础医学院解剖教研室泸州646000 西南医科大学医学影像系泸州646000

目的利用CRISPR/Cas9技术构建分选连接蛋白9(sorting nexin 9,SNX9)基因敲除小鼠模型并对其表型进行分析。方法针对C57BL/6小鼠SNX9基因第3~5外显子,设计gRNA靶位点并在体外转录获得sgRNA,与编码Cas9的mRNA混合后通过受精卵显微注射方... 详细信息

目的利用CRISPR/Cas9技术构建分选连接蛋白9(sorting nexin 9,SNX9)基因敲除小鼠模型并对其表型进行分析。方法针对C57BL/6小鼠SNX9基因第3~5外显子,设计gRNA靶位点并在体外转录获得sgRNA,与编码Cas9的mRNA混合后通过受精卵显微注射方法获得F0代阳性敲除小鼠。通过繁育及基因型鉴定获得SNX9基因敲除纯合子小鼠(SNX9^(-/-)小鼠);取小鼠尾部组织提取DNA,用PCR和琼脂糖凝胶电泳进行基因型鉴定;提取SNX9基因敲除小鼠脑组织蛋白,用Western blot检测SNX9蛋白和小胶质细胞标志蛋白的表达水平;记录SNX9基因敲除小鼠的繁殖率和体重,并与野生型小鼠比较;步态系统分析SNX9基因敲除小鼠的步态情况;苏木精-伊红(HE)染色观察小鼠脑组织的形态结构。结果F1代杂合子(SNX9^(+/-))小鼠繁育后可获得3种基因型:野生型(SNX9^(+/+))、杂合子(SNX9^(+/-))、纯合子(SNX9^(-/-));鼠尾提取的DNA用聚合酶链反应(PCR)能鉴定出小鼠的基因型,SNX9敲除小鼠脑组织的SNX9蛋白表达显著低于野生型小鼠;SNX9基因敲除小鼠可正常生长繁殖,但繁殖率显著低于野生型小鼠(P0.05);SNX9基因敲除小鼠脑组织形态学特征与野生型小鼠相比无明显差异;SNX9基因敲除小鼠脑组织的小胶质细胞标志蛋白表达水平与野生型小鼠相比差异无统计学意义(P>0.05)。结论利用CRISPR/Cas9技术成功获得SNX9基因敲除小鼠,为研究SNX9基因的生物学功能和调控机制提供了实验动物模型。

关键词：分选连接蛋白9 CRISPR/Cas9 基因敲除表型分析

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DC Traction Power Supply System Based on Modular Multilevel Converter Suitable for Energy Feeding and De-icing

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 649-659页

作者： Lingxi Hou Shuqing Zhang Yingdong Wei xiaoqian Li Qirong jiang Mingrui Li Weirui Li Department of Electrical Engineering Tsinghua UniversityBeijing 100084China

A novel DC traction power supply system suitable for energy feeding and de-icing is proposed in this paper for an urban rail transit catenary on the basis of the full bridge submodule (FBSM) modular multilevel converter (MMC). The FBSM-MMC is a novel type of voltage source converter (VSC) and can directly control the output DC voltage and conduct bipolar currents, thus flexibly controlling the power flow of the urban rail transit catenary. The proposed topology can overcome the inherent disadvantages of the output voltage drop in the diode rectifier units, increase the power supply distance and reduce the number of traction substations. The flexible DC technology can coordinate multiple FBSM-MMCs in a wide area and jointly complete the bidirectional control of catenary power flow during the operation of the electric locomotive, so as to realize the local consumption and optimal utilization of the recovered braking energy of the train. In addition, the FBSM-MMCs can also adjust the output current when the locomotive is out of service to prevent the catenary from icing in winter. The working modes of the proposed topology are illustrated in detail and the control strategy is specially designed for normal locomotive operations and catenary de-icing. Simulation cases conducted by PSCAD/EMTDC validate the proposed topology and its control strategy.

关键词： DC traction power supply system de-icing for catenary energy feeding modular multilevel converter based on full-bridge submodules(FBSM-MMC) urban rail transit

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三蝶烯衍生物研究新进展

有机化学 2011年第7期31卷 949-963页

作者：蒋晓乾管鑫张红华南理工大学化学与化工学院广州510640 广东省东莞市环保局东莞532009 广东药学院医药化工学院中山528458

三蝶烯及其衍生物是一类具有独特三维刚性结构的桥环化合物,由于其诱人的应用前景已经引起了人们极大的关注.简要地综述了三蝶烯衍生物在合成方法学、分子机器、材料化学、主客体化学及有机催化等领域的研究与近5年来的新进展,并对其发... 详细信息

三蝶烯及其衍生物是一类具有独特三维刚性结构的桥环化合物,由于其诱人的应用前景已经引起了人们极大的关注.简要地综述了三蝶烯衍生物在合成方法学、分子机器、材料化学、主客体化学及有机催化等领域的研究与近5年来的新进展,并对其发展趋势作了展望.

关键词：蝶烯三蝶烯杂环三蝶烯高三蝶烯研究进展