检索结果-南通市图书馆

Burden levels of polychlorinated dibenzo-p-dioxins, dibenzofurans, and polychlorinated biphenyls in typical edible meat animals

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2023年第3期125卷 742-749页

作者： Ying Han Wenbin Liu Rongrong lei Mingxin Wang Yingang Xue School of Environmental&Safety Engineering Changzhou UniversityChangzhou 213164China Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China Hangzhou Institute for Advanced Study UCASHangzhou 310024China University of Chinese Academy of Sciences Beijing 100049China

The concentrations and distributions of polychlorinated dibenzo-p-dioxins(PCDDs), polychlorinated dibenzofurans(PCDFs), and polychlorinated biphenyls(PCBs) in the whole blood and meat of eight typical edible animals(chicken, donkey, horse, cattle, rabbit, sheep, duck,and pig) were illustrated. Total concentrations of polychlorinated dibenzo-p-dioxins and dibenzofurans(PCDD/Fs) and PCBs(on a basis of liquid volume) in animal bloods were 142-484 pg/L and 46-62 ng/L, respectively. Total concentrations of PCDD/Fs and PCBs(on a basis of dry weight(dw) and lipid weight(lw)) in animal meat samples were 0.47-1090 pg/g dw(0.47-4513 pg/g lw) and 7.2-23 ng/g dw(10-776 ng/g lw), respectively. TEQs for both PCDD/Fs and PCBs in animal blood and meat samples were(67 ± 27) pg/L and(5.3 ± 14) pg/g dw(24± 56 pg/g lw), respectively. Besides, the dietary intakes of PCDD/Fs and PCBs were also estimated. Chicken and pig contributed more TEQs than other animals. Chicken contributed the most(95%) with high toxicity, followed by pig(3.4%) with high consumption. The dietary intake of chicken might pose risks to consumers who prefer to eat chicken products, who should comprehensively consider the essential nutrients and contaminants in food during dietary intake.

关键词： Food PCDD/Fs PCBs Bioaccumulation Dietary intake Human exposure

Occurrence,spatial and seasonal variation,and environmental risk of pharmaceutically active compounds in the Pearl River basin,South China

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2023年第4期17卷 83-95页

作者： Haojun lei Kaisheng Yao Bin Yang Lingtian Xie Guangguo Ying SCNU Environmental Research Institute Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety&MOE Key Laboratory of Theoretical Chemistry of EnvironmentSouth China Normal UniversityGuangzhou 510006China School of Environment South China Normal UniversityGuangzhou 510006China Aquatic Ecology and Water Quality Management Group Wageningen University6700 AA WageningenNetherlands

The occurrence,fate,and environmental risk of 40 pharmaceutically active compounds(PhACs)from surface waters and sediments were comprehensively investigated in the Beijiang River,Xijiang River,and Maozhou River of the Pearl River basin,South *** acid and diclofenac(antiinflammatory drugs),gemfibrozil(a lipid regulator),carbamazepine(an antiepileptic drug),diazepam(a psychoactive drug),and 2-methyl-4-chloro-phenoxyacetic acid(MCPA,a pesticide)were the most ubiquitous compounds in the studied *** average concentrations of detected PhACs in surface waters and sediments ranged from 0.17 to 19.1 ng/L and 0.10 to 10.4 ng/g,***,PhACs concentration in surface waters and sediments varied greatly among and within the Beijiang River,Xijiang River,and Maozhou *** largest annual flux of PhACs of the Xijiang River and Beijiang River was more than 11000 kg per annum,whereas only 25.7 kg/a in the Maozhou *** addition,the estimated emissions of PhACs in the Beijiang River,Xijiang River,and Maozhou River ranged respectively from 0.28 to 4.22 kg/a,0.12 to 6.72 kg/a,and 6.66 to 91.0 kg/a,and the backestimated usage varied with a range from 12.0 to 293 kg/a,6.79 to 944 kg/a,368 to 17459 kg/***,the emissions of PhACs showed a close relationship with the gross domestic product(GDP)of each city along the Pearl *** environmental risk assessment suggested that diazepam and ibuprofen had a moderate risk in this region.

关键词： Pharmaceutically active compounds Occurrence Spatiotemporal variations Pearl River Environmental risk assessment

Bio-inspired Recyclable Carbon Interface for Solar Steam Generation

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2020年第2期17卷 315-325页

作者： lei Shi Xinzhi Wang Yanwei Hu Yurong He Yuying Yan School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China Fluids&Thermal Engineering Research Group Faculty of EngineeringUniversity of NottinghamNG72RDUK Research Centre for Fluids and Thermal Engineering University of Nottingham Ningbo ChinaNingbo 315100China

Solar power,as one of renewable energy,holds potential application for producing steam which relies on high-temperature liquid by traditional ***,steam was generated by a bio-inspired strategy derived from the plants transpiration using a Printed Recyclable Carbon Membrane(PRCM).The membrane structure facilitated the concentration of carbon particles for the photoreaction and the heat generation for water evaporation,thereby improving the photo-thermal conversion *** PRCM achieved the best steady evaporation efficiency of 51.9%,which was 5.6 times higher than the value for water and recycling tests were *** carbon particles were separated from the water under the magnetism action,a convenient approach that avoided secondary pollution resulting from the disintegration of the *** preparation,low cost,and reusability of the printed carbon membrane allow for photo-thermal applications such as solar steam generation and seawater desalination.

关键词： solar steam generation photo-thermal conversion bionic heat transfer process magnetic control

Architecture,Control,and Implementation of Networked Microgrids for Future Distribution Systems

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2022年第2期10卷 286-299页

作者： lei Yan Mehrdad Sheikholeslami Wenlong Gong Mohammad Shahidehpour Zuyi Li the Illinois Institute of Technology ChicagoIL 60616USA

Microgrid(MG)is a small-scale,self-sufficient power system that accommodates various distributed energy resources(DERs),controllable loads,and future distribution *** microgrids(NMGs)are clusters of MGs,which are physically interconnected and functionally coordinated to enhance distribution systems in terms of economics,resilience,and *** paper introduces the architecture and control of NMGs including nanogrid(ng)and *** accommodate variable DERs in NMGs,master and distributed control strategies are adopted to manage the high penetration of DERs,where master control focuses on economic operation,while distributed control focuses on reliability and resilience through active power sharing and voltage and frequency *** initial practices of ng,MG,and NMG in the networked Illinois Institute of Technology(IIT)campus microgrid(ICM)and Bronzeville community microgrid(BCM)in the *** *** applications of the master and distributed control strategies are illustrated for the networked ICM-BCM to show their benefits to economics,resilience,and reliability.

关键词： Networked microgrid economics resilience reliability master control distributed control real-time simulation.

Numerical weather modeling-based slant tropospheric delay estimation and its enhancement by GNSS data

在线全文

学校读者我要写书评

暂无评论

Geo-Spatial Information Science 2013年第3期16卷 186-200页

作者： lei YAng Chris HILL Terry MOORE Nottingham Geospatial Institute The University of NottinghamTriumph RoadNottinghamNG72TUUK

Unmitigated tropospheric delay is one of the major error sources in precise point positioning(PPP).Precise Slant Tropospheric Delay(STD)estimation could help to provide cleaner observables for PPP,and improve its convergence,accuracy,and *** is difficult to model accurately due to the rapid spatial and temporal variation of the water vapor in the *** the traditional approach,the STD is mapped from the zenith direction,which assumes a spherically symmetric local tropospheric profile and has *** this paper,a new approach of directly estimating the STD from high resolution numerical weather modeling(NWM)products is *** approach benefits from the best available meteorological information to improve real time STD estimation,with the RMS residual lower than 3.5 cm above 15°elevation,and 2 cm above 30°.Therefore,the new method can provide sufficient accuracy to improve PPP convergence *** improve the performance of the new method in highly variable tropospheric conditions,a correction scheme is proposed which combines NWM information with multi-GNSS observations from a network of local continuously operating reference *** is demonstrated through a case study that this correction scheme is quite effective in reducing the STD estimation residuals and PPP convergence time.

关键词： slant troposphere delay numerical weather modeling(NWM) precise point positioning(PPP) multi GNSS

Effect of ciliary neurotrophic factor on bcl-2 and c-jun gene and protein expression in cultured retinal nerve cells

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2010年第9期5卷 662-667页

作者： Xiang zh.ng Xiang lei Yueyue Liu Genlin Li Beijing Tongren Eye Center Beijing Tongren Hospital Capital Medical University Beijing Ophthalmology and Visual Sciences Key LaboratoryBeijing 100730 China

BACKGROUND：In various retinal neurodegenerative animal models,ciliary neurotrophic factor （CNTF） exhibits prominent neuroprotective effects on retinal nerve ***-2 is an anti-apoptotic protein.c-Jun is upregulated and phosphorylated in the activated c-Jun N-terminal kinase pathway,which subsequently mediates ***,the effect of CNTF on Bcl-2 and c-Jun expression in retinal nerve cells remains ***：To determine the dynamic changes in retinal nerve cell apoptosis,as well as bcl-2 and c-jun gene and protein expression,following a single dose of CNTF in a short period of ***,TIME AND SETTIng：A single-blind,randomized,controlled,in vitro experiment was performed at the Central Laboratory of Beijing Tongren Hospital from May 2008 to April ***：Neonatal bovine retinal nerve cells （Chinese Holstein）,recombinant human CNTF （PeproTech,Rocky Hill,NJ,USA）,rabbit polyclonal anti-Bcl-2 and c-Jun antibodies （Abeam,Cambridge,UK）,fluorescein isothiocyanate-conjugated annexin V/propidium iodide kit （BioVision,Mountain View,CA,USA）,real time polymerase chain reaction instrument （ABI,Foster City,CA,USA）,and flow cytometer （BD FACSCalibur,Franklin Lakes,NJ,USA）.METHODS：Neonatal bovine retinal cells from passage 2 were cultured for 3 days and incubated with,or without,50 ng/mL CNTF （control）.MAIN OUTCOME MEASURES：Cell apoptosis was detected via Annexin V-FITC/PI double-staining and flow ***-2 and c-jun mRNA and protein expression were detected by quantitative real time polymerase chain reaction and western blot ***：The proportion of late-stage apoptotic cells was significantly decreased at 2,4,and 6 days after CNTF treatment compared with the control group （P 〈 0.01）.CNTF did not alter bcl-2 mRNA expression at the three time points,but significantly increased Bcl-2 protein expression at 2 and 4 days （P 〈 0.01）.c-jun mRNA expression was significantly decreased 4 days after CNTF treatment （P〈 0.01）.In addition,c-Jun pro

关键词： ciliary neurotrophic factor c-jun bcl-2 apoptosis nerve cells retina neural factor neural regeneration

Multiresidue determination and potential risks of emerging pesticides in aquatic products from Northeast China by LC-MS/MS

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2018年第1期30卷 116-125页

作者： lei Fu Xianbo Lu Jun Tan Longxing Wang Jiping Chen CAS Key Laboratory of Separation Science for Analytical Chemistry Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Belling 100049China

A simple method for determining 33 pesticides with a wide polarity range（log Kow0.6-4.5） in aquatic products was developed based on LC–MS/MS. The target analytes included three types of widely used pesticides： insecticides, fungicides and herbicides. Based on the optimization of ultrasonic assisted extraction and GPC clean-up procedures, the matrix effect, extraction recoveries and LOD were improved distinctively. LOQ of this method was below 0.5 ng/g for all pesticides, which is superior to values in the literature, and the matrix effect was reduced effectively（-14.7% to 7.5%）. The method was successfully applied to investigate the pesticide residue levels of twenty-five samples including seven common kinds of fishes from Northeast China. The results showed that all targeted pesticides were present in the fish samples; however, their levels were low, except for atrazine, linuron,ethoprophos, tetrachlorvinphos, acetochlor and fenthion. Atrazine and linuron caught our attention because the concentrations of atrazine in fish samples from Liaoning province were in the range of 0.5-8 ng/g（w/w） with mean concentration of 2.3 ng/g, which were far above those of other pesticides. The levels of linuron were in the range of 0.6-6 ng/g（mean concentration 2.8 ng/g）, which were the highest among all targeted pesticides in the Inner Mongolia. This is the first systematic investigation on the characteristics and levels of these pesticides in aquatic products from northeast China. Considering their toxicity and bioaccumulation, the potential risk of atrazine and linuron from consuming aquatic products should be paid more attention.

关键词： Pesticide residues Aquatic products LC-MS/MS Northeast China

L-proline feeding for augmented freeze tolerance of Camponotus japonicus Mayr

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2019年第23期64卷 1795-1804页

作者： Mengjia Dou Yazhou Li Ziqiao Sun lei Lia Wei Rao C4S Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China School of Energy and Power Engineering Beihang UniversityBeijing 100191China Beijing Engineering Research Center of Sustainable Energy and Buildings Beijing University of Civil Engineering and ArchitectureBeijing 100044China School of Future Technology University of Chinese Academy of SciencesBeijing 100049China Beijing Key Laboratory of Cryo-Biomedical Engineering Beijing 100190China

The successful cryopreservation of organs is a strong and widespread demand around the world but faces great challenges. The mechanisms of cold tolerance of organisms in nature inspirit researchers to find new solutions for these challenges. Especially, the thermal, mechanical, biological and biophysical changes during the regulation of freezing tolerance process should be studied and coordinated to improve the cryopreservation technique and quality of complex organs. Here the cold tolerance of the Japanese carpenter ants, Camponotus japonicus Mayr, was greatly improved by using optimal protocols and feeding on L-proline-augmented diets for 5 days. When cooling to -27.66 ℃, the survival rate of frozen ants increased from 37.50% ± 1.73% to 83.88% ± 3.67%. Profiling of metabolites identified the concentration of whole-body L-proline of ants increased from 1.78 to 4.64 ng g-1 after 5-day feeding. High Lproline level, together with a low rate of osmotically active water and osmotically inactive water facilitated the prevention of cryoinjury. More importantly, gene analysis showed that the expression of ribosome genes was significantly up-regulated and played an important role in manipulating freezing tolerance. To the best of our knowledge, this is the first study to link genetic variation to the enhancement of ants’ cold tolerance by feeding exogenous cryoprotective compound. It is worth noting that the findings provide the theoretical and technical foundation for the cryopreservation of more complex tissues,organs, and living organisms.

关键词： L-proline Cryopreservation Freeze tolerance Metabolomics Gene expression

Simultaneous determination of brominated phenols in soils

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2013年第11期25卷 2306-2312页

作者： Wei Han Sen Wang Honglin Huang lei Luo Shuzhen zh.ng State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences

Brominated phenols （BPs）, a widely used group of emerging flame retardants, are important environmental contaminants and exhibit endocrine disrupting potential. Method for simultaneous determination of tetrabromobisphenol A （TBBPA）, tribromophenol （TBP）, dibromophenols （DBPs） and monobromophenols （MBPs） in soils using gas chromatography-mass spectrometry analysis （GC/MS） was successfully developed. Cleanup methods for soil extracts including several solid-phase extraction cartridges and different elution solvents were compared and optimized. Florisil cartridge with dichloromethane as the elution reagent was selected for sample cleanup owing to its high and reproducible recoveries of the target analytes in soils. Derivatization conditions were tested and the optimal conditions were obtained with 20 μL silylation reagent at room temperature. The chromatographic separation was optimized with different columns and DB-XLB column was selected for its excellent separation of the analytes. The limits of detection for the target compounds were from 0.04 to 0.19 ng/g. Mean recoveries of the compounds from spiked soils exceeded 84% with a good reproducibility, excepting that the recovery of 2-bromophenol was relatively poor （lower than 55%） due to its instability. The developed method was applied to the determination of the BPs in the soils collected from e-waste sites. The contents of BPs in the soils were at ng/g levels with TBBPA and TBP the most frequently detected. To our knowledge, this is the first report for the simultaneous determination of TBBPA, TBP, DBPs and MBPs in soils.

关键词： brominated phenols analysis soil derivatization GC/MS