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Removal of Pyrene from Contaminated Soils by White Clover

Pedosphere 2009年第2期19卷 265-272页

作者： XU Sheng-You chen Ying-Xu LIN Kuang-Fei chen Xin-Cai LIN Qi LI Feng WANG Zhao-Wei department of environmental Engineering Zhejiang University Hangzhou 310029 China College of Life and Environment Huangshan University Huangshan 245041 China School of Resource and environmental Engineering East China University of Science and Technology Shanghai 200237 China

Phytoremediation has been used as an emerging technology for remediation of soil contamination with polycyclic aromatic hydrocarbons(PAHs),ubiquitous persistent environmental pollutants derived from natural and anthropogenic processes,in the last *** this study,a pot experiment was conducted to investigate the potential of phytoremediation of pyrene from spiked soils planted with white clover(Trifolium repens)in the greenhouse with a series of pyrene concentrations ranging from 4.2. to 365.38 mg *** results showed that growth of white clover on pyrenecontaminated soils was not *** removal of pyrene from the spiked soils planted with white clover was obviously higher than that from the unplanted *** the end of the experiment(60 d),the average removal ratio of pyrene in the spiked soils with white clover was 77%,which was 31%and 57%higher than those of the controls with or without micobes, *** roots and shoots of white clover took up pyrene from the spiked soils and pyrene uptake increased with the soil pyrene ***,the plant-enhanced dissipation of soil pyrene may be the result of plant-promoted microbial degradation and direct uptake and accumulation of pyrene by white clover were only a small part of the pyrene *** factors of pyrene(BCFs,ratio of pyrene,on a dry weight basis,in the plant to that in the soil)tended to decrease with increase in the residual soil pyrene ***,removal of pyrene in the contaminated soils was feasible using white clove.

关键词： microbial degradation phytoremediation plant uptake and accumulation pyrene white clover

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High-fat diet impairs gut barrier through intestinal microbiota-derived reactive oxygen species

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science china(Life sciences) 2024年第5期67卷 879-891页

作者： Nianyi Zeng Fan Wu Junqi Lu Xiang Li Shaomei Lin Lang Zhou Zhongwei Wang Guangyan Wu Qingfa huang Daowen Zheng Jie Gao Shan Wu Xiaojiao chen Muxuan chen Fanguo Meng Haitao Shang Yan He Peng chen Hong Wei Zhuang Li Hongwei Zhou Microbiome Medicine Center Department of Laboratory MedicineZhujiang HospitalSouthern Medical UniversityGuangzhou 510282China department of environmental Health Guangdong Provincial Key Laboratory of Tropical Disease ResearchSchool of Public Health and Tropical MedicineSouthern Medical UniversityGuangzhou 510515China Redox Medical Center for Public Health Soochow UniversitySuzhou 215301China Precision Medicine Institute The First Affiliated HospitalSun Yat-sen UniversityGuangzhou 510080China department of Pathophysiology Guangdong Provincial Key Laboratory of ProteomicsSchool of Basic Medical SciencesSouthern Medical UniversityGuangzhou 510515China

Gut barrier disruption is a key event in bridging gut microbiota dysbiosis and high-fat diet(HFD)-associated metabolic ***,the underlying mechanism remains *** the present study,by comparing HFD-and normal diet(ND)-treated mice,we found that the HFD instantly altered the composition of the gut microbiota and subsequently damaged the integrity of the gut *** sequencing revealed that the HFD upregulates gut microbial functions related to redox reactions,as confirmed by the increased reactive oxygen species(ROS)levels in fecal microbiota incubation in vitro and in the lumen,which were detected using in vivo fluorescence *** microbial ROS-producing capability induced by HFD can be transferred through fecal microbiota transplantation(FMT)into germ-free(GF)mice,downregulating the gut barrier tight ***,mono-colonizing GF mice with an Enterococcus strain excelled in ROS production,damaged the gut barrier,induced mitochondrial malfunction and apoptosis of the intestinal epithelial cells,and exacerbated fatty liver,compared with other low-ROS-producing Enterococcus *** administration of recombinant high-stability-superoxide dismutase(SOD)significantly reduced intestinal ROS,protected the gut barrier,and improved fatty liver against the *** conclusion,our study suggests that extracellular ROS derived from gut microbiota play a pivotal role in HFD-induced gut barrier disruption and is a potential therapeutic target for HFD-associated metabolic diseases.

关键词： fatty liver disease gut microbiota gut barrier high-fat diet oxidative stress reactive oxygen species

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On four closely related hypotrichous ciliates(Protozoa,Ciliophora,Spirotrichea):molecular characters,interspecific relationships and phylogeny defined with multigene sequence information

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Acta Oceanologica Sinica 2010年第5期29卷 90-96页

作者： GAO Feng YI Zhenzhen chen Zigui AL-RASHEID Khaled A S SONG Weibo Laboratory of Protozoology Key Laboratory of Ecology and Environmental Science in Guangdong Higher Education College of Life Science South China Normal University Guangzhou 510631 China Laboratory of Protozoology KLM Ocean University of China Qingdao 266003 China Zoology department King Saud University Riyadh 11451 Saudi Arabia

In order to clarify the phylogeny and relationships of the most confused hypotrichous ciliates,Holosticha-complex,four closely related holostichids（five populations）,Holosticha bradburyae,***,Anteholosticha sp.,and ***,were compared and analyzed using ITS2.secondary structures,ITS1-5.8S-ITS2.region and SSrRNA gene *** ITS1-5.8S-ITS2.region sequences of these four species were first sequenced,and they shared sequence identities ranging from 68.0% to 90.1%,while two populations of Anteholosticha *** in three nucleotides（sequence identity 99.8%）.There were several minor differences among ITS2.secondary structures of these species,while two populations of Anteholosticha *** the identical secondary *** trees inferred from the ITS1-5.8S-ITS2.region sequences of stichotrichs using multiple algorithms（Neighbor-Joining,Maximum Parsimony and Bayesian） revealed similar *** results show that：（1） Holosticha bradburyae and *** firmly clustered together with strong bootstrap supports,forming a sister clade with Anteholosticha sp.,（2. Anteholosticha appeared to be a paraphyletic assemblage,in which the morphotype *** was more closely related to Diaxonella trimarginata than to its congener Anteholosticha *** analyses based on the SSrRNA gene and the combined sequences of SSrRNA gene and ITS1-5.8S-ITS2.region revealed the similar relationships between Holosticha and Anteholosticha,nevertheless their positions within the subclass Stichotrichia differed from each other inferred from different genes.

关键词： phylogeny gene sequencing marine ciliates SSrRNA ITS1-5.8S-ITS2

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A HISTORICAL EXAMINATION ON LAND DESERTIFICATION IN NORTH china

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Chinese Geographical science 2001年第2期11卷 115-119页

作者： YAN Ting-zhen1 , chen Xi-bo2., HAN Guang-hui1 (1. department of Urban and {2. sciences, Peking university, Beijing 100871, P. R. china 2. School of Humanities and Social sciences, Dalian university of Technology, Dalian 11602., P.R. china) department of Urban and environmental {2.s Peking University Beijing P. R. China School of Humanities and Social sciences Dalian University of Technology Dalian P. R. China

Desertification control has been facing severe situations in the interlocking area between cultivated land and grazing land in North china since the Qing Dynasty because of unreasonable land utilization. The paper analyzes the policies of all the previous governments to open up land, and examines the historical and geographical background and process by means of historical records. We consider that causes of the area of land desertification to extend are increase of farming migrants, the change of life style of Mongol and weather and land conditions. In order to control the spread of land desertification, we suggest the level of the government to make policies should be improved, the number of farming migrants should be controlled, the Government′s general and specific polices should be actively publicized, and investment in agriculture should be increased.

关键词： farming migrants life style of Mongol weather and land conditions land desertification Qing Dynasty

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MOF-derived Cu embedded into N-doped mesoporous carbon as a robust support of PdAu nanocatalysts for ethanol electrooxidation

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Rare Metals 2024年第3期43卷 1083-1094页

作者： Yu-Fu huang Peng Wu Jun-Ping Tang Jian Yang Jing Li Shuai chen Xue-Ling Zhao chengchen Bin-Wei Zhang Yan-Yun Ma Wei-Heng Shi Dong-Hai Lin Shi-Gang Sun School of Energy and Materials Shanghai Engineering Research Center of Advanced Thermal Functional MaterialsShanghai Key Laboratory of Engineering Materials Application and EvaluationShanghai Polytechnic UniversityShanghai201209China State Key Laboratory of Physical Chemistry of Solid Surfaces Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005China School of Chemistry and Chemical Engineering Chongqing UniversityChongqing401331China Center of Advanced Energy Technology and Electrochemistry Institute of Advanced Interdisciplinary StudiesChongqing UniversityChongqing400044China Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou215123China department of Materials science and Engineering Drexel UniversityPhiladelphiaPA19104USA

Metal-organic frameworks(MOFs)h ave attracted widespread attention due to their large surface area and porous *** designing the nanostructures of MOFs to promote their application in ethanol electrooxidation is still a ***,a novel Cu-NCNs(Cu-nitrogen-doped carbon nanotubes)support was synthesized by pyrolysis of melamine(MEL)and Cu-ZIF-8 together,and then,Pd-Au nanoalloys were loaded by sodium borohydride reduction method to prepare PdAu@Cu-NCNs *** generating mesoporous carbon with high specific surface area and favorable electron and mass transport can be used as a potential excellent carrier for PdAu *** addition,the balance of catalyst composition and surface structure was tuned by controlling the content of Pd and ***,the best-performed Pd_(2.Au_(2.@Cu-NCN-1000-2.where 1000 means the carrier calcination temperature,and 2.means the calcination constant temperature time)catalyst exhibits better long-term stability and electrochemical activity for ethanol oxidation in alkaline media(4.80 A·mg^(-1)),which is 5.05 times higher than that of commercial Pd/C(0.95 A·mg^(-1)).Therefore,this work is beneficial to further promoting the application of MOFs in direct ethanol fuel cells(DEFCs)and can be used as inspiration for the design of more efficient catalyst support structures.

关键词： Metal-organic frameworks(MOFs) N-doped Mesoporous carbon PdAu Ethanol electrooxidation

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Siliceous mesocellular foam supported Cu catalysts for promoting non-thermal plasma activated CO_(2. hydrogenation toward methanol synthesis

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Frontiers of Chemical science and Engineering 2024年第7期18卷 55-65页

作者： Yi chen Shaowei chen Yan Shao Cui Quan Ningbo Gao Xiaolei Fan Huanhao chen State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China School of environmental science and Engineering Nanjing Tech UniversityNanjing 211816China School of Energy and Power Engineering Xi’an Jiaotong UniversityXi’an 710049China department of Chemical Engineering School of EngineeringThe University of ManchesterManchester M139PLUK Nottingham Ningbo china Beacons of Excellence Research and Innovation Institute University of Nottingham Ningbo ChinaNingbo 315048China Institute of Wenzhou Zhejiang UniversityWenzhou 325006China

Electrified non-thermal plasma (NTP) catalytic hydrogenation is the promising alternative to the thermal counterparts, being able to be operated under mild conditions and compatible with green electricity/hydrogen. Rational design of the catalysts for such NTP-catalytic systems is one of the keys to improve the process efficiency. Here, we present the development of siliceous mesocellular foam (MCF) supported Cu catalysts for NTP-catalytic CO_(2. hydrogenation to methanol. The findings show that the pristine MCF support with high specific surface area and large mesopore of 784 m2.g−1 and ~8.5 nm could promote the plasma discharging and the diffusion of species through its framework, outperforming other control porous materials (viz., silicalite-1, SiO_(2., and SBA-15). Compared to the NTP system employing the bare MCF, the inclusion of Cu and Zn in MCF (i.e., Cu1Zn1/MCF) promoted the methanol formation of the NTP-catalytic system with a higher space-time yield of methanol at ~2.5 μmol·g_(cat)^(−1)·h^(−1) and a lower energy consumption of 2..4 kJ^(−1)·mmol_(CH_(3)OH)^(-1) (conversely, ~2.5 μmol·g_(cat)^(−1)·h^(−1) and ~71 kJ^(−1)·mmol_(CH_(3)OH)^(-1), respectively, for the bare MCF system at 10.1 kV). The findings suggest that inclusion of active metal sites (especially Zn species) could stabilize the CO_(2./CO-related intermediates to facilitate the surface reaction toward methanol formation.

关键词： non-thermal plasma(NTP)catalysis Cu catalyst CO_(2.hydrogenation methanol siliceous mesocellular foam(MCF)

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Numerically quantifying the relative importance of topography and buoyancy in driving groundwater flow

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science china Earth sciences 2010年第1期53卷 64-71页

作者： YANG JianWen 1,2.FENG ZuoHai 1,LUO XianRong 1 & chen YuanRong 1 1 Faculty of Earth sciences,Guilin {2. of Technology,Guilin 541004,china 2.department of Earth and environmental sciences,{2. of Windsor,Windsor,Ontario,N9B 3P4,Canada 1. Faculty of Earth sciences Guilin University of Technology Guilin 541004 China2. Department of Earth and Environmental Sciences University of Windsor Windsor Ontario N9B 3P4 Canada

Both topography and buoyancy can drive groundwater flow;however,the interactions between them are still poorly *** this paper,the authors conduct numerical simulations of variable-density fluid flow and heat transport to quantify their relative *** finite element modeling experiments on a 2.D conceptual model reveal that the pattern of groundwater flow depends largely upon the relative magnitude of the flow rate due to topography alone and the flow rate due to buoyancy *** fluid velocity due to topography is greater than that due to buoyancy at large water table gradients,topography-driven 'forced convection' overwhelms buoyancy-driven 'free convection'.When flow velocity due to buoyancy is greater than that due to topography at small water table gradients,mixed free and forced convection takes *** this case,free convection becomes dominant,but topography-driven flow still plays an important role since it pushes the free convection cells to migrate laterally in the downhill ***,hydrothermal fluid flow remains changing periodically with time and no steady state can be *** presence of a low-permeability layer near the surface helps eliminate the topography effect on the underlying free convection.

关键词： hydrothermal flow free convection forced convection topography buoyancy finite element modeling

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High nitrogen fertilizer input enhanced the microbial network complexity in the paddy soil

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Soil Ecology Letters 2024年第2期6卷 97-109页

作者： Yanan chen Yan Li Tianyi Qiu Haoran He Ji Liu chengjiao Duan Yongxing Cui Min {2. Chunyan Wu Linchuan Fang The Research Center of Soil and Water Conservation and Ecological Environment Chinese Academy of Sciences and Ministry of EducationYangling712100China State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water Conservation CAS and MWRYangling712100China university of Chinese Academy of sciences Beijing100049China Institute of Environment Resource and Soil Fertilizer Zhejiang Academy of Agricultural SciencesHangzhou310021China College of Natural Resources and Environment Northwest A&F UniversityYangling712100China Hubei Province Key Laboratory for Geographical Process Analysis and Simulation Central China Normal UniversityWuhan430079China department of Ecohydrology Leibniz Institute of Freshwater Ecology and Inland FisheriesBerlin12587Germany Sino-French Institute for Earth System science College of Urban and Environmental SciencesPeking UniversityBeijing100871China College of Resources and environmental Engineering Wuhan University of TechnologyWuhan430070China CAS Center for Excellence in Quaternary science and Global Change Xi’an710061China

N fertilizer altered bacterial community compositions by changing soil nutrients.•Bacterial ammonia oxidation became predominated with the increasing N rate.•Excessive N input caused the information of a more complex microbial network.•Intensified microbial competition by excessive N was due to negative link ***(N)fertilization drives the structure and function of soil microbial communities,which are crucial for regulating soil biogeochemical cycling and maintaining ecosystem *** the N fertilizer effects on soil microbial composition and diversity have been widely investigated,it is generally overlooked that ecosystem processes are carried out via complex associations among microbiome ***,we examined the effects of five N fertilization levels(0,135,180,2.5,and 360 kg N ha−1)on microbial co-occurrence networks and key functional taxa such as ammonia-oxidizers in paddy *** results showed that N addition altered microbial community composition,which were positively related to soil total N and available phosphorus(P)*** abundance of ammonia-oxidizing archaea(AOA)significantly decreased after N addition,whereas ammonia-oxidizing bacteria(AOB)increased in N360 *** with low-N group(N0 and N135),the high-N group(N2.5 and N360)shaped more complex microbial webs and thus improved the stability of the microbial *** least squares path modeling further revealed that N fertilizer had a higher effect on microbial network complexity in the high-N group(0.83)than the low-N group(0.49).Although there were more positive links across all microbial networks,the proportion of negative links significantly increased in the high-N network,suggesting that excess N addition aggravated the competition among microbial *** these interactions between microbial communities and N fertilization advances our understanding of biogeochemical processes in paddy soils and their effects on nutrient supply to

关键词： nitrogen fertilizer paddy soil co-occurrence network microbial interaction

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Sources appointment and health risks of PM_(2.5)-bound trace elements in a coastal city of southeastern china

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Journal of environmental sciences 2024年第4期138卷 561-571页

作者： Ziyi Lin Xiaolong Fan Gaojie chen Youwei Hong Mengren Li Lingling Xu Baoye Hu chen Yang Yanting chen Zhiqian Shao Jinsheng chen Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Key Lab of Urban Environment and Health Institute of Urban EnvironmentChinese Academy ofSciencesXiamen 361021China university of Chinese Academy of sciences Beijing 100049China Minnan Normal university Zhangzhou 363000China

To gain a comprehensive understanding of sources and health risks of trace elements in an area of china with high population densities and low PM_(2.5)concentrations,15 trace elements(Al,K,Ca,Ti,V,Cr,Mn,Fe,Ni,Cu,Zn,As,Sn,Ba,Pb)in PM_(2.5)were monitored from December 2.2. to November 2.2. in a representative city,*** concentrations of trace elements in Xiamen displayed an obvious seasonal variation and were dominated by K,Fe,Al,Ca and *** on Positive Matrix Factorization analysis,source appointment revealed that the major sources of trace elements in Xiamen were traffic,dust,biomass and firework combustion,industrial manufacture and shipping *** to health risk assessment combined with the source appointment results,it indicated that the average noncarcinogenic risk was below the threshold and cancer risk of four hazardous metals(Cr,Ni,As,Pb)exceeded the threshold(10^(-6)).Traffic-related source had almost half amount of contribution to the health risk induced by PM_(2.5)-bound trace *** the dust transport period or Spring Festival period,the health risks exceeded an acceptable threshold even an order of magnitude higher,suggesting that the serious health risks still existed in low PM_(2.5)environment at certain *** risk assessment reminded that the health risk reduction in PM_(2.5)at southeastern china should prioritize traffic-related hazardous trace elements and highlighted the importance of controlling vehicles emissions in the future.

关键词： PM_(2.5)-bound trace elements Seasonal variations Source appointment Health risks Traffic-related source

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The impact of vegetation restoration on erosion-induced sediment yield in the middle Yellow River and management prospect

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science china Earth sciences 2005年第6期48卷 724-741页

作者： chen Hao1, ZHOU Jinxing2. CAI Qiangguo1, YUE Zhongqi3, LU Zhongchen4, LIANG Guanglin1& {2. Jianguo5 1. Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic sciences and Natural Resources Re-search, Chinese Academy of sciences, Beijing 100101, china 2. Institute of Forestry, Chinese Academy of Forestry sciences, Beijing 100091, china 3. department of Civil Engineering, university of Hong Kong, Hong Kong, china 4. Eco-environmental Research Center, Chinese Academy of sciences, Beijing 100085, china 5. College of Resources and Environment, Southwest Agricultural university, Chongqing 400716, china Correspondence should be addressed to chen Hao 1. Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences 100101 Beijing China 2. Institute of Forestry Chinese Academy of Forestry Sciences 100091 Beijing China 3. department of Civil Engineering University of Hong Kong Hong Kong China 4. Eco-environmental Research Center Chinese Academy of Sciences 100085 Beijing China 5. College of Resources and Environment Southwest Agricultural University 400716 Chongqing China

According to the characteristics of water and erosion environments of different natural zones on the Loess Plateau, this paper studies changes of vegetation types, distribution boundaries of forest and grass as well as restoration capacity of vegetation in different natural zones in the middle Yellow River. The annual precipitation of 530 mm is the critical annual pre-cipitation for forest and grass distribution in the middle Yellow River. Among the zonal and azonal environmental factors affecting watershed sediment yield, the intermediate diameter D50 (mm) of suspended load and forest coverage (V, %) play the leading role. Of them the effect weight of forest coverage (V, %) on catchments sediment yield is only 3.4% less than the role of the intermediate diameter (D50, mm), they are almost the same. To effectively control soil erosion in semiarid, especially in hilly-gullied areas and make sediment transport modulus reduce to less than 6000 t/km2. it is rather difficult by merely relying on natural restoration of forest. In the process of cultivated land conversion into forest land and grassland, measures suiting local conditions should be adopted in tree species selection and artificial afforestation (grass planting) based on management with biological measures for slopeland and engineering measures for hilly-gullied areas, so that watershed forest coverage in key counties can reach at least over 30%.Compared with the standard period of precipitation prior to the 1960s, with the decrease of an-nual precipitation at various periods, plant productivities decline to different degrees under natural conditions. The main reason accountable for the low survival rate of new seedlings and grass over years is due to precipitation decrease. In light with regression models of annual pre-cipitation and natural vegetation productivities, it is possible to obtain estimated values of wa-tershed natural vegetation productivity and eco-water consumption needed for the restoration to

关键词： vegetation restoration, eco-water requirement, watershed sediment yield, the middle Yellow River.

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