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羟胺强化Cu(Ⅱ)活化过氧乙酸降解有机染料

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中国环境科学 2024年第10期44卷 5547-5555页

作者：欧杰丽刘义青唐钰琦付永胜西南交通大学环境科学与工程学院四川成都611756

采用盐酸羟胺(ha)强化Cu(Ⅱ)活化过氧乙酸(PAA)降解亚甲基蓝(MB),考察了溶液初始pH值、反应物投加量及水环境中常见阴离子、天然有机物对ha/Cu(Ⅱ)/PAA体系去除MB效果的影响;通过鉴别体系中的主要活性物质,探究PAA在ha/Cu(Ⅱ)/PAA体系... 详细信息

采用盐酸羟胺(ha)强化Cu(Ⅱ)活化过氧乙酸(PAA)降解亚甲基蓝(MB),考察了溶液初始pH值、反应物投加量及水环境中常见阴离子、天然有机物对ha/Cu(Ⅱ)/PAA体系去除MB效果的影响;通过鉴别体系中的主要活性物质,探究PAA在ha/Cu(Ⅱ)/PAA体系中的活化机理.结果表明:pH值为7.0条件下,当Cu(Ⅱ)和PAA投加量均为200μmol/L时,向Cu(Ⅱ)/PAA体系中加入400μmol/L的ha,经过30min的反应,MB的去除率可由14.7%增加到74.1%,降解速率由0.0047min^(-1)提高至0.2271min^(-1);ha的引入推动了Cu(Ⅱ)向Cu(Ⅰ)的转化,促进了PAA的催化分解,导致体系中生成更多的活性物种.基于自由基淬灭实验结果,羟基自由基(HO•)主导了MB的氧化降解.溶液pH值对MB降解影响较大,中性和弱碱性环境更有利于ha/Cu(Ⅱ)/PAA体系对MB的降解.共存Cl^(-)和HCO_(3)^(-)会抑制MB降解,而天然有机质对MB降解起一定促进作用.

关键词：过氧乙酸 Cu(Ⅱ) 盐酸羟胺高级氧化亚甲基蓝

SWINANINE　C＆D，TWO　NEW　DITERPENE　ALKALOIDS　FROM　DELPHINIUM　SWINANENSE　VAR　LEPTOPOGON

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Chinese Chemical Letters 1995年第4期6卷 309-310页

作者： Suo Hing ZhaNG Ji ha Qing Yu ou (Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou730000)a: (Department of Biology, Lanzhou University, Lanzhou 730000) Chinese Acad Sci Lanzhou Inst Chem Phys Lanzhou 730000 Peoples R China Lanzhou Univ Dept Biol Lanzhou 730000 Peoples R China

s: Two new diterpene alkaloids named swinanine C and D were isolated from Delphinium swinanense var leptopogon (H. -M. ) W. T. Wang. Their structures were elucidated by means of spectral methods , principally 1H-NHR, ... 详细信息

关键词： VAR LEPTOPOGON SWINANENSE FROM DITERPENE ALKALOIDS DELPHINIUM

长沙市1例人感染H5N6禽流感病毒遗传进化和基因特征

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中国热带医学 2024年第6期24卷 680-685页

作者：李灵之肖姗徐明忠欧新华姚栋裴瑞青黄政长沙市疾病预防控制中心湖南长沙410004

目的对长沙市1例人感染禽流感H5N6病毒A/Changsha/1/2022(H5N6)的遗传进化与分子特征进行分析,为防控人感染H5N6禽流感提供依据。方法运用第三代测序平台对样本进行全基因组测序,从美国国家生物技术信息中心(National Center for Biot... 详细信息

目的对长沙市1例人感染禽流感H5N6病毒A/Changsha/1/2022(H5N6)的遗传进化与分子特征进行分析,为防控人感染H5N6禽流感提供依据。方法运用第三代测序平台对样本进行全基因组测序,从美国国家生物技术信息中心(National Center for Biotechnology Information, NCBI)和全球共享禽流感数据倡议组织(Global Initiative on Sharing All Influenza Data, GISAID)数据库下载参考序列进行比对,利用Mega7软件构建遗传进化树并分析关键氨基酸变异位点。结果对序列进行分析发现,本研究毒株属于H5亚型Clade2.***.4.4b分支。PB1与湖南省A/duck/Hunan/S40199/2021(H5N6)同源性为99.69%;PB2与A/Whooper swan/Sanmenxia/Y36/2020(H5N8)同源性为98.58%;其余序列与2021年广州发现的毒株A/Guangdong/1/2021(H5N6)高度同源。以上结果表明该病例是由重组的H5N6亚型禽流感病毒感染导致。对毒株序列的氨基酸位点分析发现,裂解位点氨基酸组成为RERRRKR↓GLF,符合高致病性禽流感特征。ha序列中Q226L和G228S位点未发生突变,提示病毒保留结合禽类受体的特征,然而S127P、S137A、T160A、T192R、A267T的突变增加了病毒对人类的亲和性。NA蛋白茎部59-70位点缺失,提示该毒株能增强病毒在哺乳动物体内的毒力。内部基因PB1发生S622G突变,PB2发生K389R和V598T突变,PA发生N409S突变,M1发生N30D和T215A突变,NS1发生P42S突变,这些突变会增强禽流感病毒感染小鼠的毒力。结论本研究的长沙市人感染H5N6病毒为高致病性禽流感病毒,倾向于结合禽类受体,但关键氨基酸位点存在多处变异进而易于感染人类,应持续加强对禽流感H5N6病毒的监测与研究。

关键词： H5N6 禽流感病毒基因特征遗传进化

Estimation of Land Production and Its Response to Cultivated Land Conversion in North China Plain

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Chinese Geographical Science 2011年第6期21卷 685-694页

作者： JIANG Qun＇ou DENG Xiangzheng ZhaN Jinyan HE Shujin Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Center for Chinese Agricultural Policy Chinese Academy of Sciences Beo＇ing 100101 China State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Beijing 100875 China

Food safety and its related influencing factors in China are the hot research topics currently,and cultivated land conversion is one of the significant factors influencing food safety in *** the North China Plain as the study area,this paper examines the changes of cultivated land area using satellite images,estimates land productivity from 1985 to 2005 using the model of Estimation System for Land Productivity(ESLP),and analyzes the impact of cultivated land conversion on the land *** with the grain yield data from statistical yearbooks,the results indicate that ESLP model is an effective tool for estimating land *** productivity in the North China Plain showed a slight decreasing trend from 1985 to 2005,spatially,increased from the north to the south gradu-ally,and the net changes varied in different *** land area recorded a marginal decrease of 8.0 × 105 ha,mainly converted to other land *** land conversion had more significant negative impacts on land produc-tion than land productivity *** production decreased by about 6.48 × 106 t caused by cultivated land conversion between 1985 and 2005,accounting for 91.9% of the total land production *** the land productivity increased in Anhui and Jiangsu provinces,it can not offset the overall adverse effects caused by cultivated land ***,there are significant meanings to control the cultivated land conversion and improve the land pro-ductivity for ensuring the land production in the North China Plain.

关键词： land productivity land production cultivated land cultivated land conversion North China Plain

不同碳源对污泥堆肥过程腐殖质电子转移能力的影响

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桂林理工大学学报 2024年第2期44卷 304-312页

作者：孙晓杰谭知涵张木喜王亚搏欧车权宜桂林理工大学广西环境污染控制理论与技术重点实验室广西桂林541006 桂林理工大学岩溶地区水污染控制与用水安全保障协同创新中心广西桂林541006 桂林理工大学广西环境污染控制理论与技术重点实验室科教结合科技创新基地广西桂林541006

以污水处理厂污泥为主要原料,葡萄糖、蔗糖分别作为外加碳源进行高温堆肥,探讨不同碳源对污泥好氧堆肥过程中腐殖质(HS)的电子转移能力(ETC)的影响。通过电化学方法测定了堆肥不同阶段的HS中胡敏酸(ha)和富里酸(FA)的电子供给能力(EDC)... 详细信息

以污水处理厂污泥为主要原料,葡萄糖、蔗糖分别作为外加碳源进行高温堆肥,探讨不同碳源对污泥好氧堆肥过程中腐殖质(HS)的电子转移能力(ETC)的影响。通过电化学方法测定了堆肥不同阶段的HS中胡敏酸(ha)和富里酸(FA)的电子供给能力(EDC)和电子接受能力(EAC),以三维荧光光谱、紫外-可见光谱、傅里叶变换红外光谱等分析方法表征HS的结构和组成变化。结果表明:两个处理HS的EDC、EAC和RER(电子循环率)在堆肥过程中都呈现不断增强的趋势;相比葡萄糖组试验,蔗糖组试验增强了ha和FA的ETC和RER,对ha的EDC和FA的EAC提升效果较好;光谱学分析发现,蔗糖组试验促进了蛋白类物质的降解和类胡敏酸、类富里酸物质的形成,且腐殖化程度、芳香化程度和含氧活性基团含量高于葡萄糖组试验。相关性分析表明,类胡敏酸物质和芳香族物质的增加促进了ha的ETC和RER的增加,而分子量的增大,蛋白质的下降,腐殖化程度的提高,类富里酸和芳香族物质的形成有利于FA中ETC和RER的增强。因此,在选择污泥堆肥的外加碳源时,可通过蔗糖的投加来强化堆肥腐殖质电子转移能力。

关键词：堆肥电子转移能力胡敏酸富里酸三维荧光平行因子分析

有机肥施用对废弃矿区饲料桑生长特征和根系形态的影响

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草业科学 2024年第6期41卷 1336-1346页

作者：邱静芸连海陈荣强雷小文欧翔钟云平吴丽娟张强赣州市畜牧水产研究所江西赣州341401

为研究有机肥施用对废弃矿区饲料桑(Morus alba)根系形态的影响,探明根系形态与地上部分生长的关系。以饲料桑‘粤桑11号’(‘Yuesang No.11’)为试验材料,设置6个处理组,包括1个对照组,化肥(CK);5个试验组,沼液(T_(1))、牛粪(T_(2))、... 详细信息

为研究有机肥施用对废弃矿区饲料桑(Morus alba)根系形态的影响,探明根系形态与地上部分生长的关系。以饲料桑‘粤桑11号’(‘Yuesang No.11’)为试验材料,设置6个处理组,包括1个对照组,化肥(CK);5个试验组,沼液(T_(1))、牛粪(T_(2))、牛粪+沼液(T_(3))、蚯蚓粪(T_(4))和蚯蚓粪+沼液(T_(5)),测定各组饲料桑的产量、株高、相对生长速率和根系生长指标。结果表明:1)与CK相比,施用有机肥各组饲料桑鲜草产量显著提高(P0.05),其中T5处理下,年鲜草产量最高,为21.49 t·hm^(-2);除沼液处理外,其余4组有机肥组株高相对生长速率均较CK组显著增加(P0.05)。2)与CK相比,施用有机肥组饲料桑根长、根尖数和0~0.5 mm径级根长、0~0.5 mm径级根尖数显著增加(P0.05),其中T_(5)处理下根长和0~0.5 mm径级根系最长,分别为CK的5.2倍和14.5倍;各有机肥处理组饲料桑分支数、交叉数和根表面积、根体积均显著增加(P0.05)。3)与CK相比,施用有机肥组的比根长增加5.7%~115.9%;T_(2)、T_(3)、T_(4)和T_(5)组比根表面积分别增加4.1%、7.0%、38.7%和49.6%,有机肥组较CK组根系拓扑指数更趋向近于1。4)相关性分析发现,鲜草产量与比根长、比根表面积极显著正相关(P0.01),与根长、根尖、拓扑指数和土壤氨态氮含量显著正相关(P0.05)。综上,在废弃矿区中施用有机肥能够促进饲料桑根系生长和形态发育,且根系形态和土壤氨态氮含量影响地上部分生长,其中蚯蚓粪+沼液组合施肥对废弃矿区饲料桑生长促进效果最佳。

关键词：饲料桑稀土废弃矿蚯蚓粪牛粪根系生长根系构型

One-step preparation of polyimide-inlaid amine-rich porous organic block copolymer for efficient removal of chlorophenols from aqueous solution

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Journal of Environmental Sciences 2019年第4期31卷 215-229页

作者： Yanyang Liu haijian ou Shangqing Li Qingliang You Huixian Liu Guiying Liao Dongsheng Wang Engineering Research Center of Nano-Geomaterials of Ministry of Education Faculty of Material Science and ChemistryChina University of Geosciences Key Laboratory of Optoelectronic Chemical Materials and Devices Ministry of EducationSchool of Chemical and Environmental EngineeringJianghan University State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of Sciences

A novel polyimide-inlaid amine-rich porous organic block copolymer(PI-b-ARPOP) was prepared via one-step polymerization by using different molar ratios of melamine(MA)/terephthalaldehyde(TA)/pyromellitic dianhydride(PMDA), at molar ratios of 4/3/1, 4/2/2 and 4/1/3. The copolymer contained both aminal groups belonging to ARPOP and imide groups belonging to PI, and the bonding styles of the monomers and growth orientations of the polymeric chains were diversiform, forming an excellent porous structure. Notably, MA/TA/PMDA(4/2/2) had a surface area and pore volume of 487.27 m^2/g and 1.169 cm^3/g,respectively. The adsorption performance of the materials towards 2,4-dichlorophenol(2,4-DCP) in ultra-pure water was systematically studied. The pH value of 7 was optimal in aqueous solution. Na^+ and Cl^-ions did not negatively affect the adsorption process, while humic acid(ha) slightly decreased the capacity. The equilibrium time was 40 sec, and the maximum adsorption capacity reached 282.49 mg/g at 298 K. The removal process was endothermic and spontaneous, and the copolymer could maintain its porous structure and consistent performance after regeneration by treatment with alkali. Moreover, to further assess the practical applicability of the material, the adsorption performance towards 2,4-DCP in river water was also investigated. This paper demonstrated that the PI-b-ARPOP can be an efficient and practical adsorbent to remove chlorophenols from aqueous solution.

关键词： Porous block copolymer Schiff base Polyimide Adsorption 2,4-Dichlorophenol

Mechanization technology:The key to sugarcane production in China

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International Journal of Agricultural and Biological Engineering 2013年第1期6卷 1-27页

作者： ou Yinggang Malcolm Wegener Yang Dantong Liu Qingting Zheng Dingke Wang Meimei Liu haochun College of Engineering South China Agricultural UniversityGuangzhou 510642China School of Agriculture and Food Sciences The University of QueenslandBrisbaneQLD4072Australia

Sugarcane is an important cash crop in southern China now planted on about 1.5 million ha in the main production areas in Guangxi,Zhuang Autonomous Region and Yunnan,Guangdong,and hainan *** the cost of labor in China is increasing rapidly and the price of local sugar is uncompetitive with the product from mechanized international producers,China needs to change its sugarcane production methods from manual work to mechanization in order to catch up with international trends in this global *** a lot of effort in China have gone into sugarcane mechanization since the 1960s,the overall level of mechanization in sugarcane production is still only approximately 30%,which is about 20%lower than that achieved in the other main field *** all of the sugarcane grown in China is still harvested by *** order to summarize past experience and promote the mechanization of sugarcane production in China,this paper reviews the whole process of developing mechanization since 1960s and describes the current state of sugarcane mechanization in *** research currently being undertaken and the main obstacles to be overcome in developing a mechanized sugarcane production system,are *** design and testing of sugarcane harvesting machinery and its key components has been a significant research area by some Chinese universities,research institutes,and manufacturing companies in these past *** paper reviews that research and outlines the main achievements which have been made in this *** harvesting systems for sugarcane,and the appropriate harvesting patterns suitable for different growing conditions applying in China,have also been *** paper concludes with some comments on the future directions for progress in China’s mechanization of sugarcane production and some policy suggestions to facilitate the industry's transition.

关键词： mechanization technology sugarcane production sugarcane harvester sugarcane machinery development pattern

Amplification of high-order azimuthal mode based on a ring-core Yb-doped fiber

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Optoelectronics Letters 2022年第4期18卷 222-226页

作者： ou Nanxian LI Wei QIU Runzhou ZhaNG Bin GAO Shecheng LIU Weiping Department of Electronic Engineering College of Information Science and TechnologyJinan UniversityGuangzhou 510632China Fiberhome Telecommunication Technologies Co. Ltd.Wuhan 430074China Guangdong Provincial Key Laboratory of Optoelectronic Information Processing Chips and Systems and School of Electronics and Information Technology Sun Yat-sen UniversityGuangzhou 510275China

In order to increase the number of amplified azimuthal modes in Yb-doped fiber(YDF),a multiple azimuthal modes amplifier based on a ring-core Yb-doped fiber(RC-YDF)was proposed and demonstrated.A home-made RC-YDF which can support 6 azimuthal mode groups was employed to amplify the signal mode at 1064 nm,using a core pump *** amplification characteristics of 5 high-order azimuthal linear polarization(ha-LP)mode groups(LP_(11),LP_(21),LP_(31),LP_(41),LP_(51))were studied comprehensively.A more than 8 d B gain is obtained for each signal mode with 5 d Bm input power,and the associated differential modal gain between all modes is less than 1 d *** intensity profiles of all modes are stable and well preserved during the process of amplification.

关键词： mode order modal