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SSRN 2022年

作者： Liu, Jingli Li, Yanping Duan, Dandan Peng, Guogan Li, Ping Lei, Pei Zhong, Huan Tsui, Martin Tsz-Ki Pan, Ke Shenzhen Key Laboratory of Marine Microbiome Engineering Institute for Advanced Study Shenzhen University Shenzhen518060 China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Ministry of Education Key Laboratory for Ecology of Tropical Islands College of Life Sciences Hainan Normal University Haikou571158 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China School of Life Sciences The Chinese University of Hong Kong Shatin China

Mangrove ecosystems serve as an important carbon sink but also could be a hotspot that produces neurotoxic methylmercury (MeHg). Although many studies have focused on mercury (Hg) contamination in this carbon-rich ecosystem, our understanding of the effects and mechanisms of the organic matter (OM) regulation of MeHg production in mangrove sediments is still limited. Here, we examined the effects of Hg contamination and OM enrichment on MeHg production in anoxic mangrove sediments and identified the major microbial guilds attending this process. The mangrove sediments possessed a high potential for producing MeHg, but this was counterbalanced by its rapid degradation. Sulfate-reducing bacteria (SRB) such as Desulfobacterales , Desulfovibrionales , and Syntrophobacterales were the major methylators. OM diagenesis significantly changed the biogeochemical conditions, accelerating MeHg removal in the sediments. The enhanced MeHg demethylation was attributable to the abundant sulfide produced during OM decomposition, which potentially inhibited the Hg methylation by immobilization of inorganic Hg, abiotically degraded MeHg, and favored the non- mer -mediated degradation of MeHg by SRB (e.g., Desulfosarcina and Desulfatiferula ). Our study provides both geochemical and microbial clues that can partly explain the low MeHg levels widely observed in mangrove sediments. © 2022, The Authors. All rights reserved.

关键词： Mercury compounds

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Influences of Synoptic Circulations on Regional Transport, Accumulation And Chemical Transformation for Pm2.5 Heavy pollution Over Twain-Hu Basin, Central China

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SSRN 2023年

作者： Yao, Jingyan Bai, Yongqing Zhao, Tianliang Zhu, Yan Sun, Xiaoyun Tan, Chenghao Xiong, Jie Luo, Yuehan Hu, Weiyang Yang, Tong Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster Nanjing University of Information Science and Technology Nanjing210044 China Hubei Key Laboratory for Heavy Rain Monitoring and Warning Research Institute of Heavy Rain China Meteorological Administration Wuhan430205 China Hubei Meteorological Service Center Wuhan430205 China Anhui Province Key Laboratory of Atmospheric Science and Satellite Remote Sensing Anhui Institute of Meteorological Sciences Hefei230031 China State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou510640 China University of Chinese Academy of Sciences Beijing100049 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University 163 Xianlin Rd Jiangsu Nanjing210023 China

The Twain-Hu Basin (THB), located in Central China, serves as a key juncture where the northerly "polluted" airflows of the East Asian winter monsoon meet the southerly warm and humid airflows. Using the T-PCA objective synoptic pattern classification, FLEXPART-WRF, and Random Forest model, we investigate the influences of synoptic circulations on regional transport, local accumulation, and chemical transformation of PM2.5 during heavy air pollution over the THB in January of 2015-2022. The results show that the transport-type synoptic pattern accounts for 65.16% of heavy PM2.5 pollution, indicating that regional transport of PM2.5 dominates the THB’s heavy air pollution. The PM2.5/CO ratio is higher in the transport-type pattern and positively correlated with PM2.5 concentrations, reflecting a higher efficiency of chemical transformation to secondary PM2.5 in transport-type pollution compared with the accumulation-type pollution. Transport-type heavy PM2.5 pollution is predominantly influenced by upstream anomalous northerly and easterly airflows at the bottom of the high-pressure system, converging with the southern wind in the receptor area over the THB. Accumulation-type heavy pollution exhibits weak wind anomalies in central and eastern China under the control of a uniform pressure field. Furthermore, thermally-induced vertical circulations with sinking airflows in the middle and lower troposphere suppress the vertical air pollutant dispersions. The relative contributions of atmospheric factors for transport-type PM2.5 heavy pollution events are 38.0% for dynamical driver, 26.8% for thermal driver, and 35.1% for chemical transformation, while in accumulation-type, the contribution rates are 33.9%, 36.3%, and 29.7%, respectively. This study elucidates the influences of synoptic patterns on regional transport, local accumulation, and chemical transformation of PM2.5 for heavy air pollution, with implications for understanding changes of air quality in the recepto

关键词： Atmospheric movements

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Migration and Secondary Reproduction Characteristics of Invertebrates in Drinking Water System

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SSRN 2022年

作者： Ren, Xueli Zhang, Yifeng Li, Jinzhe Zhou, Zeting Wang, Zheng Tang, Xianchun Chen, Hongbin Zhang, Dong State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China College of Environmental Science and Civil Engineering Jiangnan University Jiangsu Province 214122 China Shanghai Zhongyao Environmental Protection Industry Co. Ltd China Shanghai National Engineering Research Center of Urban Water Resources Co. Ltd China

The massive reproduction of invertebrates in drinking water not only affects the sense and smell of drinking water, but also has potential disease risk. In this study, two typical ozone activated carbon advanced treatment plants in Shanghai were selected. The spatial distribution of invertebrates in waterworks was analyzed by means of field investigation;the migration and secondary reproduction characteristics of invertebrates in waterworks and water supply networks before and after the pipeline reconstruction or the application of membrane filtration device were studied. The main results were as follows: In addition to rotifers and nematodes with a detection rate of 100%, crustaceans, water mites, tardigrades are also detected in water supply system. The effects of the pipeline reconstruction on the density and the secondary reproductive potential of invertebrates in the water supply network were great;while the pipeline reconstruction did not have a significant effect on the secondary reproductive potential or density of invertebrates in terminal tap water. Membrane device can effectively control biological leakage, but long-term operation will still lead to the leakage of invertebrates. Finally, the safety risk posed by invertebrates in the water supply system was mainly due to their ability to promote bacterial regeneration and carry bacteria. It was found that the secondary reproduction of invertebrates could increase the safety risks of drinking water. The study provides a basis for controlling the reproductive growth of invertebrates in drinking water, and is of great significance to ensure the biological safety of drinking water. © 2022, The Authors. All rights reserved.

关键词： Potable water

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Emerging contaminants:A One Health perspective

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The Innovation 2024年第4期5卷 140-170,139页

作者： Fang Wang Leilei Xiang Kelvin Sze-Yin Leung Martin Elsner Ying Zhang Yuming Guo Bo Pan Hongwen Sun Taicheng An Guangguo Ying Bryan WBrooks Deyi Hou Damian EHelbling Jianqiang Sun Hao Qiu Timothy MVogel Wei Zhang Yanzheng Gao Myrna JSimpson Yi Luo Scott XChang Guanyong Su Bryan MWong Tzung-May Fu Dong Zhu Karl JJobst Chengjun Ge Frederic Coulon Jean Damascene Harindintwali Xiankui Zeng Haijun Wang Yuhao Fu Zhong Wei Rainer Lohmann Changer Chen Yang Song Concepcion Sanchez-Cid Yu Wang Ali El-Naggar Yiming Yao Yanran Huang Japhet Cheuk-Fung Law Chenggang Gu Huizhong Shen Yanpeng Gao Chao Qin Hao Li Tong Zhang Natàlia Corcoll Min Liu Daniel SAlessi Hui Li Kristian KBrandt Yolanda Pico Cheng Gu Jianhua Guo Jianqiang Su Philippe Corvini Mao Ye Teresa Rocha-Santos Huan He Yi Yang Meiping Tong Weina Zhang Fidèle Suanon Ferdi Brahushi Zhenyu Wang Syed AHashsham Marko Virta Qingbin Yuan Gaofei Jiang Louis A.Tremblay Qingwei Bu Jichun Wu Willie Peijnenburg Edward Topp Xinde Cao Xin Jiang Minghui Zheng Taolin Zhang Yongming Luo Lizhong Zhu Xiangdong Li DamiàBarceló Jianmin Chen Baoshan Xing Wulf Amelung Zongwei Cai Ravi Naidu Qirong Shen Janusz Pawliszyn Yong-guan Zhu Andreas Schaeffer Matthias C.Rillig Fengchang Wu Gang Yu James M.Tiedje State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China Department of Chemistry Hong Kong Baptist UniversityHong KongChina HKBU Institute of Research and Continuing Education Shenzhen Virtual University ParkShenzhenChina Technical University of Munich TUM School of Natural SciencesInstitute of Hydrochemistry85748 GarchingGermany School of Resources&Environment Northeast Agricultural UniversityHarbin 150030China Climate Air Quality Research UnitSchool of Public Health and Preventive MedicineMonash UniversityMelbourneVICAustralia Faculty of Environmental Science&Engineering Kunming University of Science&TechnologyKunming 650500China Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria College of Environmental Science and EngineeringNankai UniversityTianjin 300350China Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control School of Environmental Science and EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China Ministry of Education Key Laboratory of Environmental Theoretical Chemistry South China Normal UniversityGuangzhouGuangdong 510006China Department of Environmental Science Baylor UniversityWacoTXUSA Center for Reservoir and Aquatic Systems Research(CRASR) Baylor UniversityWacoTXUSA School of Environment Tsinghua UniversityBeijing 100084China School of Civil and Environmental Engineering Cornell UniversityIthacaNY 14853USA Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province Zhejiang University of TechnologyHangzhou 310014China School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Laboratoire d’Ecologie Microbienne Universite Claude Bernard Lyon 1UMR CNRS 5557UMR INRAE 1418VetAgro Sup69622 VilleurbanneFrance Department of Pla

Environmental pollution is escalating due to rapid global development that often prioritizes human needs over planetary *** global efforts to mitigate legacy pollutants,the continuous introduction of new substances remains a major threat to both people and the *** response,global initiatives are focusing on risk assessment and regulation of emerging contaminants,as demonstrated by the ongoing efforts to establish the UN’s Intergovernmental Science-Policy Panel on Chemicals,Waste,and pollution *** review identifies the sources and impacts of emerging contaminants on planetary health,emphasizing the importance of adopting a One Health *** for monitoring and addressing these pollutants are discussed,underscoring the need for robust and socially equitable environmental policies at both regional and international *** actions are needed to transition toward sustainable pollution management practices to safeguard our planet for future generations.

关键词： pollution planet contaminants

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Mnfe2o4 / Rgo/Diatomite Composites with Excellent Wideband Electromagnetic Microwave Absorption

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SSRN 2022年

作者： Li, Qingyu Guo, Wanmi Kong, Xiaotian Xu, Jiale Xu, Chunshan Chen, Yue'e Chen, Jing Jia, Xinyu Ding, Yi Anhui Province International Research Center on Advanced Building Materials Anhui Jianzhu University Anhui Hefei230022 China College of Chemistry and Materials Science Fujian Normal University Fujian Fuzhou350007 China College of Materials and Chemical Engineering Fujian Key Laboratory of Functional Marine Sensing Materials Minjiang University Fuzhou350108 China Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse Anhui Jianzhu University Anhui Hefei230022 China Anhui Province Key Laboratory of Advanced Building Materials Anhui Jianzhu University Anhui Hefei230022 China

The current electromagnetic interference phenomenon has become one of the urgent problems in the current society. The preparation of materials with excellent electromagnetic wave absorption by a simple process is challenging but urgently needed. In this work, MnFe2O4/rGO/Diatomite (M/rGO/DT) cladding structure composites were made using a direct, one-step hydrothermal technique. The ternary composite has many microwave absorption mechanisms, including interfacial dipole polarization, conductive loss, natural resonance, flux loss, huge kudos to the three-dimensional cladding cross-linked structure and close-packed MnFe2O4 particles. As a result, compared with unitary or binary composites, the absorbent material offers superior low and medium frequency microwave absorption capabilities. The composite's minimum reflection loss (RLmin) is -76.56 dB at 7.9 GHz, its thickness is 2.485 mm, and its effective absorption bandwidth (EAB) is up to 3.61 GHz. The remarkable electromagnetic wave attenuation ability of the generated ternary composite shows that the work in this research gives an innovative approach to the creation of superior microwave absorbing materials (MAMs) with a simple technique. © 2022, The Authors. All rights reserved.

关键词： Iron compounds

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Kinetic stability and transformation pathway of halogenated nitrophenols in drinking water

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Journal of Hazardous Materials 2025年 495卷 138812页

作者： Jiacheng Ge Xiaoyan Chen Zhenqi Du Yingying Zhou Ruixin Qu Jiangdong Cui Shunke Ding Wenhai Chu College of Science Nanjing Forestry University Nanjing Jiangsu Province 210037 China School of Municipal and Environmental Engineering Shandong Jianzhu University Jinan Shandong Province 250101 China State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai 200092 China Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes Ministry of Education College of Environment Hohai University Nanjing Jiangsu Province 210098 China

Halogenated nitrophenols (HNPs) have raised significant concerns due to their extensive detection and potent toxicity. Understanding how these compounds persist and degrade over time is crucial for predicting their potential accumulation and assessing the long-term exposure risks. Kinetic studies showed that the degradation of HNPs through hydrolysis and chloramination over realistic hydraulic retention times is relatively low. The species-specific second-order rate constants for the reaction of hypochlorous acid and the acid-catalyzed reaction of hypochlorous acid with anionic HNP species, which accounted for HNP degradation during chlorination, range from 3.84 ± 1.09–363.25 ± 50.44 M⁻¹min⁻¹ and from (1.50 ± 0.091) × 10⁶ to (1.34 ± 0.36) × 10⁸ M⁻²min⁻¹ , respectively. The reactivity order of reactive species in hydrolysis, chlorination, and chloramination with HNP species has also been verified through computational modeling using density functional theory. The introduction of nitro group onto HNPs significantly diminishes the electron density of the benzene ring, thereby reducing their inherent reactivity compared with other aromatic DBPs. The hydrolysis and chlorination of HNPs primarily result in the formation of halogenated hydroquinones and various polyhaloquinones and polyhalophenols, respectively. These results suggest that HNPs and their transformation products exhibit relatively high persistence and exposure risks.

关键词： Density functional theory Disinfection by-products Halogenated nitrophenols Kinetic stability Transformation pathway

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Tio2 Coated Sio2 Core-Shell Stationary Phase with Uniform and Tunable Tio2 Thickness for High Performance Liquid Chromatography Separation

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SSRN 2023年

作者： Wang, Dian Wan, Xiang Wang, Jiafei Mangelings, Debby Sun, Yuanshe Li, Tong Xu, Qin Xie, Fazhi Li, Weihua Qu, Qishu Key Laboratory of Functional Molecule Design and Interface Process Anhui Province Engineering Laboratory of Advanced Building Materials School of Materials Science and Chemical Engineering Anhui Jianzhu University Hefei230601 China Department of Analytical Chemistry Applied Chemometrics and Molecular Modelling Vrije Universiteit Brussel Laarbeeklaan 103 BrusselsB-1090 Belgium Dalian Elite Analytical Instruments Co. Ltd. Dalian116023 China College of Chemistry and Chemical Engineering Yangzhou University Yangzhou225002 China Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse School of Environment and Energy Engineering Anhui Jianzhu University Hefei230601 China

In this work, SiO2 core-shell spheres with a dendritic pore structure were used as chromatographic support and TiO2 was coated into the pores of the SiO2@dSiO2 shell using tetrabutyl orthotitanate (TBOT) as the titanium source. By simply prolonging the reaction time, a TiO2 layer with a uniform and controllable thickness was obtained on the surface of SiO2 core-shell spheres by Ostwald ripening. The thickness of the TiO2 layer can be achieved by either controlling the reaction time or controlling the amount of TBOT. When the concentration of TBOT was 0.06 mol L-1, the thickness of the TiO2 layer can be tuned from 15 to about 44 nm by changing the reaction time. When the concentration of TBOT was 0.08 mol L-1, the thickness of the TiO2 layer can be tuned from 21 to about 71 nm by changing the reaction time. C18-derived core-shell spheres with a TiO2 layer thicknesses of 40 nm (C18-SST-0.5-60) and 70 nm (C18-SST-0.7-30) were used as packings to evaluate the effect of TiO2 layer thickness on the chromatographic separation performance. The separation performance of C18-SST-0.5-60 was better than that of C18-SST-0.7-30. The separation efficiency of C18-SST-0.5-60 and C18-SST-0.7-30 for fluorene was 115112 plates m-1 and 83189 plates m-1, respectively. The columns were also used for the separation of basic, acidic and nucleoside mixtures. Both TiO2-coated core-shell packings showed good peak symmetry for basic samples, with peak asymmetry factors below 1.11. The relative standard deviations of the retention time of polycyclic aromatic hydrocarbons and anilines for intraday, interday and column-to-column variation were all lower than 6%. The results demonstrate that the TiO2 based stationary phase possesses great potential for high performance liquid chromatographic separation. © 2023, The Authors. All rights reserved.

关键词： Silica

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Efficient Treatment of the Sweet Potato Starch Wastewater by Enhanced Flocculation–Coagulation of Environmentally Benign Materials

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SSRN 2022年

作者： Zhang, Yalan Li, Meng Zhang, Guihai Liu, Wei Xu, Jinying Tian, Yuansong Wang, Yinfeng Xie, Xingyue Peng, Zhiqi Li, Aimin Zhang, Ru Wu, Daishe Xie, Xianchuan Key Laboratory of Poyang Lake Environment and Resource Utilization Ministry of Education School of Resource and Environment Nanchang University Nanchang330031 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China Wireline Product Operation ZTE Corporation Nanjing210023 China Nanjing University Yancheng Academy of Environment Protection Technology and Engineering Nanjing210023 China Jiangxi Nanxin Environmental Protection Technology Co. LTD Jiujiang City of Jiangxi Province 330300 China School of Materials and Chemical Engineering Pingxiang University Pingxiang337000 China

Sweet potato starch wastewater from rural areas of China is in urgent need of a new efficient and environmental-friendly method for proper treatment, because it contains high-concentration organic pollutants, with a great impact on water quality, and also most of it is treated in a distributed manner. In this study, bentonite was selected from four kinds of clay minerals (i.e. kaolin, zeolite, attapulgite and bentonite) as coagulant aids, and chitosan-modified bentonite combined with polyglutamic acid was used for enhanced coagulation treatment for starch wastewater. Among them, bentonite can adsorb soluble pollutants in starch wastewater, chitosan modification can enhance the coagulation effect, and the flocculant of polyglutamic acid is conducive to the removal of particulate matter through bridging effects. The combination of the three can effectively and deeply remove pollutants in starch wastewater. Under the optimal conditions, the removal rates of chemical oxygen demand , total nitrogen, total phosphorus and turbidity can reach 86.2%, 80.3%, 52.3% and 98.2%, respectively, which are far higher than that of the vast majority of coagulants currently reported. Density functional theory calculation has showed that the electrostatic potential around aluminum in bentonite of 14.248 *** -1 is more conducive to the adsorption of negatively charged organic pollutants, and that bentonite has lower adsorption energy ( -1.43 eV) than chitosan and polyglutamic acid, thereby resulting in higher adsorption affinity of bentonite. Mechanistic studies confirmed that the coagulation mechanism includes electrical neutralization and the promotion of efficient collision of clay particles to form flocs . © 2022, The Authors. All rights reserved.

关键词： Flocculation

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Recent selection and introgression facilitated high-altitude adaptation in cattle

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Science Bulletin 2024年第21期69卷 3415-3424页

作者： Yang Lyu Fuwen Wang Haijian Cheng Jing Han Ruihua Dang Xiaoting Xia Hui Wang Jincheng Zhong Johannes A.Lenstra Hucai Zhang Jianlin Han David E.MacHugh Ivica Medugorac Maulik Upadhyay Alexander SLeonard He Ding Xiaorui Yang Ming-Shan Wang Suolang Quji Basang Zhuzha Pubu Quzhen Silang Wangmu Nima Cangjue Da Wa Weidong Ma Jianyong Liu Jicai Zhang Bizhi Huang Xingshan Qi Fuqiang Li Yongzhen Huang Yun Ma Yu Wang Yuanpeng Gao Wenfa Lu Chuzhao Lei Ningbo Chen Key Laboratory of Animal Genetics Breeding and Reproduction of Shaanxi ProvinceCollege of Animal Science and TechnologyNorthwest A&F UniversityYangling 712100China Key Laboratory of Animal Production Product Qualityand SecurityMinistry of EducationCollege of Animal Science and TechnologyJilin Agricultural UniversityChangchun 130118China Institute of Animal Science and Veterinary Medicine Shandong Academy of Agricultural SciencesShandong Key Lab of Animal Disease Control and BreedingJinan 250000China College of Veterinary Medicine Northwest A&F UniversityYangling 712100China Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization Sichuan Province and Ministry of EducationSouthwest Minzu UniversityChengdu 610000China Faculty of Veterinary Medicine Utrecht UniversityUtrecht 3584 CMThe Netherlands Institute for Ecological Research and Pollution Control of Plateau Lakes School of Ecology and Environmental ScienceYunnan UniversityKunming 650500China Southwest United Graduate School Kunming 650500China Yazhouwan National Laboratory Sanya 572024China CAAS-ILRI Joint Laboratory on Livestock and Forage Genetic Resources Institute of Animal ScienceChinese Academy of Agriculture Sciences(CAAS)Beijing 100000China Animal Genomics Laboratory UCD School of Agriculture and Food ScienceUniversity College DublinDublin D04 V1W8Ireland UCD Conway Institute of Biomolecular and Biomedical Research University College DublinDublin D04 V1W8Ireland Population Genomics Group Department of Veterinary SciencesLMU MunichMartinsried 82152Germany Animal Genomics ETH ZurichUniversitaetstrasse 2Zurich 8006Switzerland State Key Laboratory of Genetic Resources and Evolution Yunnan Laboratory of Molecular Biology of Domestic AnimalsKunming Institute of ZoologyChinese Academy of SciencesKunming 650223China Institute of Animal Husbandry and Veterinary Science Xizang Autonomous Region Academy of Agricultural and Animal Husbandry SciencesLhasa 850000China Shigatse City Kan

During the past 3000 years,cattle on the Qinghai-Xizang Plateau have developed adaptive phenotypes under the selective pressure of hypoxia,ultraviolet(UV)radiation,and extreme *** genetic mechanism underlying this rapid adaptation is not yet well ***,we present whole-genome resequencing data for 258 cattle from 32 cattle breeds/populations,including 89 Tibetan cattle representing eight populations distributed at altitudes ranging from 3400 m to 4300 *** genomic analysis revealed that Tibetan cattle exhibited a continuous phylogeographic cline from the East Asian taurine to the South Asian indicine *** found that recently selected genes in Tibetan cattle were related to body size(HMGA2 and NCAPG)and energy expenditure(DUOXA2).We identiﬁed signals of sympatric introgression from yak into Tibetan cattle at different altitudes,covering 0.64%–3.26%of their genomes,which included introgressed genes responsible for hypoxia response(EGLN1),cold adaptation(LRP11),DNA damage repair(LATS1),and UV radiation resistance(GNPAT).We observed that introgressed yak alleles were associated with noncoding variants,including those in present *** Tibetan cattle,three yak introgressed SNPs in the EGLN1 promoter region reduced the expression of EGLN1,suggesting that these genomic variants enhance hypoxia *** together,our results indicated complex adaptation processes in Tibetan cattle,where recently selected genes and introgressed yak alleles jointly facilitated rapid adaptation to high-altitude environments.

关键词： Tibetan cattle Introgression High-altitude adaptation Noncoding variant Cis-regulation

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New Insights on Removal Mechanism of 17α-Estradiol Based on Adsorption and Fenton-Like Oxidation by FeNPs/rGO

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SSRN 2021年

作者： Liu, Longjie Lin, Jiajiang Owens, Gary Chena, Zuliang Fujian Key Laboratory of Pollution Control & Resource Reuse School of Environmental Science and Engineering Fujian Normal University Fujian Province Fuzhou350007 China Environmental Contaminants Group Future Industries Institute University of South Australia Mawson Lakes Campus Mawson LakesSA5095 Australia

Wastewater from sewage treatment plants containing 17α-estradiol (αE2) has a high potential to cause environmental and human toxicity. Integration of adsorption and Fenton-like oxidation is one of the potential approaches to enhance αE2 removal. In this study, one-step biosynthesized iron nanoparticles/reduced graphene oxide (FeNPs/rGO) by tea extract was successfully used for αE2 removal. The results showed that the removal of αE2 by FeNPs/rGO increased to 56.1%, being only 25.4% and 45.4% for rGO and FeNPs, respectively, indicating that both adsorption and Fenton-like oxidation enhanced the removal of αE2, where was confirmed by HPLC-UV. To understand the removal mechanism, characterizations, including ESR, SEM, EDS, FTIR and XPS were used to elucidate the specific roles of rGO and FeNPs in the adsorption and oxidation of αE2, and results showed that αE2 was adsorbed as a monolayer on the surface of rGO via π–π bond interactions and that FeNPs underwent reactions with H2O2 to generate ·OH for αE2 degradation. Thereafter, a αE2 degradation pathway was identified via identification of degradation products (e.g., C18H22O3) by HPLC-MS. Moreover, the removal of αE2 by FeNPs/rGO conformed to the Langmuir isotherm with pseudo-first-order adsorption kinetics and pseudo-second-order degradation kinetics. Based on these evidences, the removal of αE2 by FeNPs/rGO was presented. © 2021, The Authors. All rights reserved.

关键词： Oxidation

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