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Status of multielement in water of the river Buriganga, Bangladesh: Aquatic chemistry of metal ions in polluted river water

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Emerging Contaminants 2021年第1期7卷 99-115页

作者： Aklima Nargis Ahsan Habib Harun-Or-Rashid Halima Binte Harun md Shafiqul Islam Sarker Rong Jin Guorui Liu Wenbin Liu A.N.M.Al-Razee kai Chen Minggang Cai Coastal and Ocean Management Institute Xiamen UniversityXiamenPR China Department of Chemistry University of DhakaDhaka1000Bangladesh Central Chemical Laboratory Department of Narcotics ControlMinistry of Home AffairsDhaka1204Bangladesh Sate Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental ScienecsChinese Academy of SciencesBeijing100085PR China Department of Analytical Chemistry&Environmental Science Training Institute for Chemical IndustriesPolashBangladesh

The peripheral rivers of Dhaka city became highly polluted because of industrialization and urbanization to a greater extent in the last few ***,an attempt has been taken to measure 48 elements in water of the river Buriganga using the ICP-MS method for the first ***,it could be the reference values for future research in *** of the 48 elements,the following metals are given more attention because of their detrimental effects on living organisms and for discussing their aquatic chemistry in polluted water body:Be,Na,Al,Cr,Mn,Fe,Ni,Cu,Zn,Cd,Ba,Hg,Pb,Bi and *** revealed that metals’concentrations in water in the monsoon were less than that of the winter,however,Cr and Fe were found at below detection limits in the winter that is *** parameters of the river water such as pH,dissolved oxygen play vital roles for hydrolysis reactions in the stagnant water *** products of metal ions having low values of solubility products(K sp),for example,iron(III)hydroxide,chromium(III)hydroxide,phase out through precipitation *** study also detects and quantifies total concentrations of Hg and U in water of the river Buriganga for the first *** and correlation matrix results provided potential sources of the relevant *** of hydrolysis and precipitation reactions for metal ions in the polluted river water are also discussed.

关键词： hydrolysis winter river

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Exploring visitors’visual perception along the spatial sequence in temple heritage spaces by quantitative GIS methods:a case study of the Daming Temple,Yangzhou City,China

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Built Heritage 2023年第4期7卷 91-109页

作者： kai Zhou Wenting Wu Tianjie Li Xiaoling Dai School of Design and Architecture Zhejiang University of Technology288 Liuhe RdWest Lake DistrictHangzhou310023China

The Daming Temple,built during 457–464 C.E.,is one of the developing ancient temple heritage spaces located in Yangzhou city,*** the past 60 years,variation in visitors’spatial perception along the tour routes in the temple has *** research attempts to reveal the changes in visitors’visual perception along the spatial sequences at 3 different times(i.e.,1962,1973 and 2022).A quantitative GIS-based method,which includes analysing the distribution of visitors’spatial preferences and spatial configuration,is *** landscape tools and quantitative estimation methods are used,including mapping within Rhinoceros software,the kernel density estimation(KDE)method within ArcGIS software and spatial syntax analysis within DepthMap *** geodata from 500 photographs of the heritage space taken by volunteer visitors are analysed within the GIS *** of the mean depth(md)at both levels of visibility and accessibility are calculated within the visibility graph analysis(VGA)*** between the visual preferences of the visitors and the spatial configuration along the spatial sequence are *** results indicate that the spatial sequence has a significant impact on visitors’visual preferences and tour *** phenomenon of spatial sequence among dynamic temporal variations and the effects of narrative spaces along the spatial sequence are highlighted and explained,which reveal the relationship between visitors’geospatial preference and the spatial configuration of the *** suggestions are put forwards for further studies on the revitalisation and management of East Asian ancient temple heritage spaces.

关键词： temple heritage space visual preference spatial sequence spatial configuration GIS

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Molecular Insights into Distinct Membrane-insertion Behaviors and Mechanisms of 20 Amino Acids:an All-atom md Simulation Study

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Chemical Research in Chinese Universities 2023年第5期39卷 829-839页

作者： TU Wenqiang DONG Xuewei OU Luping ZHANG Xinke YUAN Bing YANG kai Center for Soft Condensed Matter Physics and Interdisciplinary Research&School of Physical Science and Technology Soochow UniversitySuzhou 215006P.R.China Songshan Lake Materials Laboratory Dongguan 523808P.R.China State Key Laboratory of Surface Physics and Department of Physics Fudan UniversityShanghai 200433P.R.China

Interfacial interactions of proteins with cell membranes play important roles in fundamental physiological processes of *** binding of proteins to membranes involves interactions between amino acids and ***,the mechanism underlying amino acids'membrane behavior remains ***,all-atom molecular dynamic simulations were applied to comprehensively investigating the molecular details of interactions between 20 amino acids with DOPC *** results show that 20 amino acids exhibit distinct membrane insertion activities,which are not simply determined by the side chain properties of amino *** Tyr/Phe/Trp,hydrophobic Val/Ile/Leu/Met,positively-charged Arg and hydrophilic Cys exhibit significantly strong membrane insertion capacities with different characteristic insertion depths and insertion ***,hydrophobic Ala,positively-charged His/Lys,hydrophilic Asn/Ser/Gln/Thr,negatively-charged Asp/Glu and Pro/Gly have low membrane insertion *** the chemical structures and interaction details of amino acids with membranes,we suggest that the abundance and diversity of interaction sites and types,the synergistic effect of hydrophilic and hydrophobic interactions of amino acids with membranes and the structural flexibility of amino acids are key factors for determining membrane insertion capabilities and characteristics of amino *** study sheds light on the atomic mechanism of interactions between single amino acids and membranes.

关键词： Amino acid-membrane interaction Membrane insertion capability Insertion depth and angle Molecular dynamic simulation

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“PBL+CBL”教学模式在传染病教学中的有效性研究——基于随机对照实验的Meta分析

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传染病信息 2024年第4期37卷 373-377页

作者：徐哲刘凯孙娇黄锐吴亚鑫解放军总医院第五医学中心感染病医学部生物损伤救治科北京100039 南方医科大学南方医院广州510515

目的评价相较于传统授课模式(lecture-based learning,LBL),以问题为基础的学习(problem-based learning,PBL)+以案例为基础的学习(case-based learning,CBL)在传染病教学中的效果。方法系统检索了比较PBL+CBL教学与LBL教学效果的随机对照研究,比较了2种教学模式下学生的理论成绩,病例分析成绩,技能操作成绩,以及对课程的满意度等。采用RevMan 5.3软件进行数据分析。结果纳入12篇随机对照试验文献,共包括研究对象1467例。Meta分析结果显示:PBL+CBL组的学生理论成绩高于对照组[均方差(mean difference,md)=5.00,95%CI:3.65~6.35,P=0.000],技能操作成绩高于对照组(md=3.67,95%CI:2.63~4.72,P=0.000),病例分析成绩高于对照组(md=2.73,95%CI:1.74~3.72,P=0.000),并且PBL+CBL组学生对教学效果表示满意的高于LBL组(RR=1.28,95%CI:1.21~1.36,P=0.000)。结论在传染病教学中,PBL+CBL教学效果优于LBL教学,且学生对PBL+CBL的教学模式更加满意。

关键词：以问题为基础的学习以案例为基础的学习传染病学 Meta分析

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Nanostructural thermoelectric materials and their perfor- mance

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Frontiers in Energy 2018年第1期12卷 97-108页

作者： kai-Xuan CHEN Min-Shan LI Dong-Chuan MO Shu-Shen LYU School of Chemical Engineering and Technology Sun Yat-senUniversity Guangzhou 510275 China Guangdong EngineeringTechnology Research Centre for Advanced Thermal Control Materialand System Integration (ATCMSI) Guangzhou 510275 China

In this review, an attempt was made to introduce the traditional concepts and materials in thermo- electric application and the recent development in search- ing high-performance thermoelectric materials. Due to the use of nanostructural engineering, thermoelectric materials with a high figure of merit are designed, leading to their blooming application in the energy field. One dimensional nanotubes and nanoribbons, two-dimensional planner structures, nanocomposites, and heterostructures were summarized. In addition, the state-of-the-art theoretical calculation in the prediction of thermoelectric materials was also reviewed, including the molecular dynamics （md）, Boltzmann transport equation, and non-equilibrium Green＇s function. The combination of experimental fabrication and first-principles prediction significantly promotes the discovery of new promising candidates in the thermoelectric field.

关键词： nanostructuml low-dimensional thermoelec-tric material figure of merit first-principles

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Source apportionment of river water pollution in a typical agricultural city of Anhui Province, eastern China using multivariate statistical techniques with APCS– MLR

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Water Science and Engineering 2023年第2期16卷 165-174页

作者： kai Chen Qi-meng Liu Wei-hua Peng Yu Liu Zi-tao Wang State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mine Huainan 232001China School of Earth and Environment Anhui University of Science&TechnologyHuainan 232001China Key Laboratory of Mine Water Resource Utilization of Anhui Higher Education Institutes Suzhou UniversitySuzhou 234000China Qinghai Institute of Salt Lakes Chinese Academy of SciencesXining 810008China

The deterioration of the surface water environment has become a serious challenge for water resources management due to increasing anthropogenic disturbance. Water resources protection requires control of potential pollution sources. In this study, 99 water samples were collected from a river in a typical agricultural city of Anhui Province in eastern China, and these samples were analyzed in terms of pH, electrical conductivity, and the concentrations of F-, Cl-, SO42-, Na+, K+, Mg2+, Ca2+, As, Cr, Cu, Zn, and Pb. Cluster analysis, co-occurrence network analysis, and principal component analysis/factor analysis were conducted to qualitatively identify the potential sources of river water pollution in the study area. An absolute principal component score-multiple linear regression receptor model was used to quantitatively evaluate the contribution of each source to water quality parameters. The results showed that all observed water quality indices met the quality criteria specified in the Chinese drinking water standards, except for pH, ρ(F-), ρ(SO42-), and ρ(As). The heat map showed that the frequent recharge of pollutants from the tributaries during the wet season was the main reason for the deterioration of water quality. Five sources of river water pollution were identified, and their contribution ratios in a descending order were as follows: the geogenic process (24%) > agricultural activities (21%) > poultry farming sources (17%) > domestic pollution (9%) > transportation pollution (5%). Therefore, controlling pollution from agricultural activities, strengthening the regulation of livestock farming, and improving the sewage network are the recommended strategies for improving the quality of surface water resources in this area.

关键词： Surface water Water quality Source apportionment APCS-MLR model Huaihe river basin

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Potential hydraulic connectivity of coal mine aquifers based on statistical analysis of hydrogeochemistry

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Water Science and Engineering 2022年第4期15卷 285-293页

作者： Xiang Zhao Wei-hua Peng kai Chen Xin-yi Qiu Lin-hua Sun School of Resources and Civil Engineering Suzhou UniversitySuzhou 234000China School of Earth and Environment Anhui University of Science and TechnologyHuainan 232001China Key Laboratory of Mine Water Resource Utilization of Anhui Higher Education Institutes Suzhou UniversitySuzhou 234000China

Mining activities interfere with the natural groundwater chemical environment,which may lead to hydrogeochemical changes of aquifers and mine water inrush *** study analyzed the hydrochemical compositions of 80 water samples in three aquifers and developed a water source identification model to explore the control factors and potential hydraulic connection of groundwater chemistry in a coal *** results showed that the hydrochemical types of the three aquifers were *** main hydrochemical compositions of the loose-layer,coal-bearing,and limestone aquifers were HCO_(3)·Cl-Na,SO_(4)·HCO_(3)-Na,and SO_(4)-Na·Ca,*** correlation,Unmix,and factor an-alyses showed that the hydrochemical composition of groundwater was controlled by the dissolution of soluble minerals(such as calcite,dolomite,gypsum,and halite)and the weathering of silicate *** factor score plot combined with Q-mode cluster analysis demon-strated no remarkable hydraulic connection among the three aquifers in the study *** water source identification model effectively identified the source of inrush ***,the mixing ratio model rationally quantified the contributions of the three aquifers to inrush water.

关键词： Groundwater Water chemistry Factor analysis Hydraulic connection Mathematical statistics

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两种不同生境卤虫肠道微生物差异及其对宿主环境适应性的影响

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海洋与湖沼 2024年第5期55卷 1223-1235页

作者：韩学凯张睿扎西拉姆李科李洪池隋丽英张驰西藏自治区农牧科学院水产科学研究所西藏拉萨850002 亚洲区域卤虫参考中心天津科技大学海洋与环境学院天津300457

卤虫(Artemia)是生存在高盐水体中的小型甲壳动物,其能够耐受多种极端环境,并可在不同的栖息地展现出不同的生理适应性,然而目前对于不同海拔地区卤虫肠道微生物组成及其与卤虫环境适应机制了解甚少。采用16S rRNA高通量测序和代谢组学... 详细信息

卤虫(Artemia)是生存在高盐水体中的小型甲壳动物,其能够耐受多种极端环境,并可在不同的栖息地展现出不同的生理适应性,然而目前对于不同海拔地区卤虫肠道微生物组成及其与卤虫环境适应机制了解甚少。采用16S rRNA高通量测序和代谢组学技术,首次对来自高海拔地区的拉果错卤虫(***)和低海拔地区的渤海湾卤虫(***和***的混种)的肠道菌群进行分析。结果显示,变形菌门(Proteobacteria)、绿弯菌门(Chloroflexi)和弧菌属(Vibrio)的丰度在拉果错卤虫肠道内显著升高,而嗜盐乳杆菌属(Halolactibacillus)、玫瑰变色菌属(Roseovarius)等的丰度在渤海湾卤虫肠道内更有优势。代谢组学分析表明,与低海拔的渤海湾卤虫相比,拉果错卤虫参与的“抗生素生物合成”和“不饱和脂肪酸的生物合成”代谢途径明显富集,戊丙酯菌素、玫瑰黄素以及脂肪酸合成所必需的二十碳五烯酸(EPA)、α-亚麻酸、脂肪酰辅酶A等代谢物显著积累(P<0.05)。这些代谢物的积累可能有利于增强拉果错卤虫适应高海拔恶劣环境的能力。研究结果揭示了在高低海拔两种不同生境中的卤虫在肠道微生物群落组成和肠道代谢产物方面均存在显著差异,从而为不同生境卤虫的环境适应机制提供重要见解。

关键词：卤虫海拔肠道微生物代谢组学 16S rRNA

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铜藻应对强光胁迫的光合适应

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陕西师范大学学报（自然科学版） 2024年第1期52卷 103-114页

作者：张琦李凌雪何健龙王宁刘凯刘丽娟徐智广鲁东大学生命科学学院山东烟台264025 山东省海洋资源与环境研究院山东烟台264006 长岛综合试验区海洋经济促进中心山东烟台265800

近年来,以漂浮种群出现的铜藻金潮频繁暴发,其作为一种特殊的生物入侵现象,对海洋生态系统造成巨大负面影响。金潮暴发时,藻体于海水表面漂浮会接受更高的光强,但铜藻应对强光胁迫的光合响应机制尚不明确。设置低光(460μmol/(m^(2)·s)... 详细信息

近年来,以漂浮种群出现的铜藻金潮频繁暴发,其作为一种特殊的生物入侵现象,对海洋生态系统造成巨大负面影响。金潮暴发时,藻体于海水表面漂浮会接受更高的光强,但铜藻应对强光胁迫的光合响应机制尚不明确。设置低光(460μmol/(m^(2)·s))、中光(920μmol/(m^(2)·s))、高光(1380μmol/(m^(2)·s))3个强光水平,探讨铜藻在强光胁迫下的光合响应及适应。结果显示,经120 min强光处理后,铜藻的光合效率显著降低,最大光化学量子产量(F_(v)/F_(m))随光照时间和强度的增加逐渐下降,高光条件下F_(v)/F_(m)值最小。相应地,强光处理后,单位反应中心吸收、耗散的能量以及捕获用于还原质体醌A的能量均显著增加,电子传递受到抑制,低、中、高3个强光水平的最大相对电子传递速率(R_(max))较初始状态分别降低了28.83%、40.34%、54.14%。同时,铜藻通过提高光系统Ⅱ反应中心净关闭率、增强非光化学淬灭和提高类胡萝卜素含量来抵御高光胁迫。恢复弱光240 min后,3种光强处理下铜藻的F_(v)/F_(m)、R_(max)和色素含量均有不同程度的恢复,且F_(v)/F_(m)和叶绿素a、叶绿素c、类胡萝卜素含量在低光处理组均恢复到初始值。以上结果说明,在不同强度的强光下,铜藻光合作用受到不同程度的胁迫,同时铜藻能通过多种光保护手段减轻胁迫,推测漂浮于海水表面的铜藻在中午受到强光胁迫后,可能经下午和晚上的弱光周期得到很大程度的恢复,使得铜藻能够适应漂浮生活并在其他条件适宜的情况下引起金潮暴发。研究结果为揭示铜藻金潮形成的生理生态机制提供了数据支持。

关键词：铜藻光照强度光合作用光损伤光修复叶绿素荧光

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基于特征增强的冬小麦冻害精细空间分布遥感提取方法

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山东农业大学学报（自然科学版） 2024年第3期55卷 433-443页

作者：张景涵伊立冉王凯李钿李峰周彬杨晓霞山东农业大学信息科学与工程学院山东泰安271018 山东省气候中心山东济南250031

如何及时、准确地获取大范围内作物冻害空间分布数据,是目前农业领域迫切需要解决的问题。本文根据冻害冬小麦的生长变化特点,提出了基于特征增强的冬小麦冻害精细空间分布遥感提取方法(Winter Wheat Frost Damage Fine Spatial Distrib... 详细信息

如何及时、准确地获取大范围内作物冻害空间分布数据,是目前农业领域迫切需要解决的问题。本文根据冻害冬小麦的生长变化特点,提出了基于特征增强的冬小麦冻害精细空间分布遥感提取方法(Winter Wheat Frost Damage Fine Spatial Distribution Extraction Method,WWFDFSDEM),用于从高分辨率遥感影像中提取高质量的冻害空间分布数据。选择冻害发生前后两期高分辨率遥感影像作为数据源,根据正常冬小麦和冻害冬小麦区域的影像特点,确定以红、近红、绿三个通道以及NDVI作为基础特征,充分利用像素级特征的空间相关性来增强特征的细节信息,以交叉熵为基础,加入特征类内差异因子和类间差异因子建立损失函数,用于增强特征的区分能力。选择山东省淄博市高青县为研究区,高分2号遥感影像为数据源,决策树、经典SegNet、RefineNet、ErfNet、UNet作为对比模型开展对比实验,WWFDFSDEM提取结果的精度(94.5%),查准率(90.8%),查全率(91.3%)均优于对比方法,证明了方法在提取冻害精细空间分布方面的有效性。方法能够满足农业生产管理、农业保险等领域提取作物冻害精细空间分布数据的需求。

关键词：冬小麦冻害空间分布特征增强遥感影像卷积神经网络

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