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"Three-in-One" Ecological Development and Efficient Utilization Model of aggregates

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Asian Agricultural Research 2024年第6期16卷 13-18页

作者： Yunkai FAN Shichang XU Qiangjie HUANG Yiyuan LU Ziyi WEI College of City Construction Jiangxi Normal UniversityNanchang 330200China School of Physics and Communication Electronics Jiangxi Normal UniversityNanchang 330022China College of Finance Jiangxi Normal UniversityNanchang 330224China

Green mining and the formation of an effective and efficient development model have become key issues that aggregates enterprises around the world need to solve urgently.On the basis of analyzing the development status of aggregates industry in Xiluodu area,the paper studied the main problems faced in the construction of green aggregates mines at present,and proposed a"three-in-one"ecological,intelligent and efficient green mine construction model for"ecological development","green logistics"and"solid waste recycling"of aggregates.The study has certain theoretical value and practical significance for the construction of green aggregates mine in Xiluodu area.

关键词： aggregates Ecological development Efficient utilization

Straw mulching alters the composition and loss of dissolved organic matter in farmland surface runoff by inhibiting the fragmentation of soil small macroaggregates

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Journal of Integrative Agriculture 2024年第5期23卷 1703-1717页

作者： Shanshan Cai Lei Sun Wei Wang Yan Li Jianli Ding Liang Jin Yumei Li Jiuming Zhang Jingkuan Wang Dan Wei College of Land and Environment Shenyang Agricultural UniversityShenyang 110866China Heilongjiang Academy of Black Soil Conservation and Utilization Harbin 150086China Institute of Plant Nutrition Resources and EnvironmentBeijing Academy of Agricultural and Forestry SciencesBeijing 100097China

Straw mulching is a widespread practice for reducing the soil carbon loss caused by erosion.However,the effects of straw mulching on dissolved organic matter(DOM)runoff loss from black soil are not well studied.How straw mulching affects the composition and loss of runoff DOM by changing soil aggregates remains largely unclear.Here,a straw mulching treatment was compared to a no mulching treatment(as a control)on sloping farmland with black soil erosion in Northeast China.We divided the soil into large macroaggregates(>2 mm),small macroaggregates(0.25-2 mm),and microaggregates(aggregates accumulated and the protein-like components in runoff declined with rain events.Fluorescence spectroscopy technology may help in understanding the hydrological paths of rain events by capturing the dynamic changes of runoff and soil DOM characteristics.A variation partitioning analysis(VPA)indicated that the DOM concentration and composition of microaggregates explained 68.2%of the change in runoff DOM from no mulching plots,while the change in runoff DOM from straw mulching plots was dominated by small macroaggregates at a rate of 55.1%.Taken together,our results demonstrated that straw mulching reduces the fragmentation of small macroaggregates and the loss of microaggregates,thus effecting DOM compositions in soil and reducing the DOM loss in runoff.These results provide a theoretical basis for reducing carbon loss

关键词： dissolved organic matter black soil surface runoff aggregates fluorescence spectrum

Soil type-dependent effects of drying-wetting sequences on aggregates and their associated OC and N

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International Soil and Water Conservation Research 2022年第4期10卷 649-661页

作者： Na Mao Xiaorong Wei Mingan Shao State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water ConservationChinese Academy of Sciences and Ministry of Water ResourcesYangling712100China Institute of Soil and Water Conservation Northwest A&F UniversityYangling712100China CAS Center for Excellence in Quaternary Science and Global Change Xi'an710061China College of Resources and Environment University of Chinese Academy of SciencesBeijing100049China

Evaluating the impacts of drying-wetting(DW)cycles on soil aggregates and their associated organic carbon(OC)and nitrogen(N)is crucial to understand the OC and N cycles.Soils are likely subjected to DW cycles with different sequences depending on seasons or in agroecosystems.However,studies on how DW sequences influence OC and N dynamics within aggregates,and whether this effect is dependent on soil type,are relatively limited.Herein,two DW sequences,i.e.,drying-wetting-dryingwetting(2DW)and wetting-drying-wetting-drying(2WD)treatments were designed,and a consistent wetting(CW)was set as a control to assess the effects of DW sequences.Four soils(Entisol,Ultisol,Anthrosol and Mollisol)varying in texture and OC content were used.The aggregate size distribution,the OC,total N(TN),readily oxidizable OC(ROOC)and mineral N(Min-N)content in aggregates were determined.Results showed that 2DW treatment increased but 2WD treatment decreased the large aggregates of Entisol and Ultisol,while 2DW and 2WD treatments synchronously increased the large aggregates of Anthrosol but decreased them of Mollisol.Two DW treatments increased the OC in each aggregate of Entisol,Anthrosol and Mollisol but decreased them of Ultisol.The 2DW didn't affect but 2WD treatment decreased ROOC in 1e2 mm aggregates of Entisol andaggregates of Ultisol and Mollisol.The 2DW and 2WD treatments minimally affected TN but potentially influenced Min-N in aggregates.The 2DW and 2WD treatments both decreased the Min-N in each aggregate size class of Entisol and Mollisol,while 2DW increased but 2WD treatment decreased Min-N in each aggregate of Ultisol and Anthrosol.These results indicated that the varied effects of DW sequences and the interactive effects of soil type with DW sequences on aggregate turnover and OC and N cycling should be reconsidered to provide more precisive evidences for global C and N cycles under the scenario of future climate changes.

关键词： aggregates Carbon Nitrogen Drying-wetting sequences Soil type

Supramolecular chiral polymeric aggregates: Construction and applications

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聚集体(英文)

聚集体(英文) 2023年第1期4卷 101-121页

作者： Gong Zhang Xiaoxiao Cheng Yuefei Wang Wei Zhang State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials Jiangsu Engineering Laboratory of Novel Functional Polymeric MaterialsSuzhou Key Laboratory of Macromolecular Design and Precision SynthesisCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou Industrial ParkSuzhouP.R.China School of Chemical Engineering and Technology State Key Laboratory of Chemical EngineeringTianjin UniversityTianjinP.R.China

Inspired by the mystery of natural homochirality,the design and construction of artificial chiral systems with special functions including mechanics,chiroptical devices,and chiral separation have aroused the great interest of scientists.Due to its diverse conformations and components,polymers become an excellent candidate to construct artificial chiral aggregates,which provides an opportunity to fabricate advanced chiral materials.Herein,in this review,we summarized not only the different strategies for construction and regulation of supramolecular chirality in chiral or achiral polymer systems,mainly including post-assembly and polymerizationinduced chiral self-assembly in chiral polymer systems and several chirality transfer and induction strategies in achiral polymer systems,but also the formation mechanisms of chiral aggregates by the chirality amplification from the molecular level to supramolecular level.Furthermore,we present the typical applications of chiral polymeric aggregates in circularly polarized light emission,chiral recognition and separation,and chiral elastomer.Finally,the current challenges and future directions of chiral polymeric aggregates are also elaborated.

关键词： aggregates chiral applications chiral assembly chirality polymers

Legacy effect of elevated CO_(2) and N fertilization on mineralization and retention of rice (Oryza sativa L.) rhizodeposit-C in paddy soil aggregates

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Soil Ecology Letters 2022年第1期4卷 78-91页

作者： Yuhong Li Hongzhao Yuan Anlei Chen Mouliang Xiao Yangwu Deng Rongzhong Ye Zhenke Zhu Kazuyuki Inubushi Jinshui Wu Tida Ge Key Laboratory of Agro-ecological Processes in Subtropical Region&Changsha Research Station for Agricultural and Environmental Monitoring Institute of Subtropical AgricultureChinese Academy of SciencesChangsha 410125China School of Resources and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou 341000China Department of Plant&Environmental Sciences Pee Dee Research&Education CenterClemson UniversityFlorenceSC 29506USA Graduate School of Horticulture Chiba UniversityMatsudo271-8510Japan University of Chinese Academy of Sciences Beijing 100049China

Rhizodeposits in rice paddy soil are important in global C sequestration and cycling.This study explored the effects of elevated CO_(2) and N fertilization during the rice growing season on the subsequent mineralization and retention of rhizodeposit-C in soil aggregates after harvest.Rice(Oryza sativa L.)was labeled with ^(13)CO_(2) under ambient(400 ppm)and elevated(800 ppm)CO_(2) concentrations with and without N fertilization.After harvest,soil with labeled rhizodeposits was collected,separated into three aggregate size fractions,and flood-incubated for 100 d.The initial rhizodeposit-^(13)C content of N-fertilized microaggregates was less than 65%of that of non-fertilized microaggregates.During the incubation of microaggregates separated from N-fertilized soils,3%–9%and 9%–16%more proportion of rhizodeposit-^(13)C was mineralized to ^(13)CO_(2),and incorporated into the microbial biomass,respectively,while less was allocated to soil organic carbon than in the non-fertilized soils.Elevated CO_(2) increased the rhizodeposit-^(13)C content of all aggregate fractions by 10%–80%,while it reduced cumulative ^(13)CO_(2) emission and the bioavailable C pool size of rhizodeposit-C,especially in N-fertilized soil,except for the silt-clay fraction.It also resulted in up to 23%less rhizodeposit-C incorporated into the microbial biomass of the three soil aggregates,and up to 23%more incorporated into soil organic carbon.These results were relatively weak in the silt-clay fraction.Elevated CO_(2) and N fertilizer applied in rice growing season had a legacy effect on subsequent mineralization and retention of rhizodeposits in paddy soils after harvest,the extent of which varied among the soil aggregates.

关键词： Rice rhizodeposits Isotope labeling aggregates Elevated carbon dioxide Nitrogen fertilizer

CCT2 is an aggrephagy receptor for clearance of solid protein aggregates

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四川生理科学杂志 2022年第2期44卷 292-292页

作者： Xinyu Ma State Key Laboratory of Membrane Biology Beijing China Department of Biochemistry and Department of Hepatobiliary and Pancreatic Surgery of the First Affiliated Hospital Zhejiang University School of Medicine Hangzhou China Tsinghua-Peking Center for Life Sciences Beijing 100084 China Cancer Research Laboratory FACS Core Facility University of California Berkeley CA 94720 USA School of Life Sciences Tsinghua University Beijing 100084 China School of Pharmaceutical Sciences Tsinghua University Beijing 100084 China

Protein aggregation is a hallmark of multiple human pathologies.Autophagy selectively degrades protein aggregates via aggrephagy.How selectivity is achieved has been elusive.Here,we identify the chaperonin subunit CCT2 as an autophagy receptor regulating the clearance of aggregation-prone proteins in the cell and the mouse brain.CCT2 associates with aggregation-prone proteins independent of cargo ubiquitination and interacts with autophagosome marker ATG8s through a non-classical VLIR motif.In addition,CCT2 regulates aggrephagy independently of the ubiquitin-binding receptors(P62,NBR1,and TAX1BP1)or chaperone-mediated autophagy.Unlike P62,NBR1,and TAX1BP1,which facilitate the clearance of protein condensates with liquidity,CCT2 specifically promotes the autophagic degradation of protein aggregates with little liquidity(solid aggregates).Furthermore,aggregation-prone protein accumulation induces the functional switch of CCT2 from a chaperone subunit to an autophagy receptor by promoting CCT2 monomer formation,which exposes the VLIR to ATG8s interaction and,therefore,enables the autophagic function.

关键词： aggregation solid aggregates

Solvothermal synthesis of nano-CeO_2 aggregates and its application as a high-efficient arsenic adsorbent

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Rare Metals 2019年第1期38卷 73-80页

作者： Jing-Hua Pang Ying Liu Jun Li Xiao-Jiao Yang College of Materials Science and Engineering Sichuan University

aggregates of cerium dioxide nanoparticles(nano-CeO_2) were successfully prepared via a facile solvothermal process in this study. The crystallographic information and morphological information of nano-CeO_2 were systematically studied by X-ray diffraction(XRD),transmission electron microscopy(TEM), laser particle size analyzer(LA) and specific surface area and pore size analyzer during the solvothermal process. Among all the obtained samples, the 18-h solvothermal-prepared nano-CeO_2 aggregates show the best crystallinity and the largest specific surface area of 110.92 m^2·g^(-1). Owing to the high activity derived from the high specific surface area of the aggregates, the application as arsenic(As) adsorption was also studied. The adsorption efficiency of arsenic by nano-CeO_2 aggregates was established as the function of adsorbent dose, then pH value and at last adsorption time.The results indicate that the nano-CeO_2 aggregates show a high efficiency in removing arsenic from low As concentration solution, from which the nano-CeO_2 adsorbent could be easily separated. In addition, the adsorption kinetics is best fitted to pseudo-second-order model(R^2 = 0.99999).

关键词： Nano-CeO2 Large surface aggregates Solvothermal Removal of arsenic

Development of a sample preparation approach to measure the size of nanoparticle aggregates by electron microscopy

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Particuology 2019年第4期17卷 49-57页

作者： Agnieszka Dudkiewicz Angela Lehner Qasim Chaudhry Kristian Molhave Guenter Allmaier Karen Tiede Alistair B.A. Boxall Peter Hofmann John Lewis The Food and Environment Research Agency Sand Hutton York Y041 1LZ UK Department of Environment The University of York Heslington York YO10 5DD UK National Centre for Food Manufacturing The University of Lincoln Holbeach PE12 7AG UK Research Group Bio- and Polymer Analysis Institute of Chemical Technologies and Analytics TU Wien (Vienna University of Technology) Getreidemarkt 9 A-1060 Vienna Austria University of Chester Parkgate Road Chester CH1 4BJ UK Department of Micro and Nanotechnology Technical University of Denmark DTU Bldg 345b Lyngby 2800 Denmark Research Centre for Global Food Security and Ecosystems University of Hohenheim Wollgrasweg 43 70155 Stuttgart Germany Department of Geoinformatics - Z.GIS University of Salzburg Schillerstr. 30 A-5020 Salzburg Austria

Electron microscopy (EM) is widely used for nanoparticle (NP) sizing. Following an initial assessment of two sample preparation protocols described in the current literature as"unperturbed", we found that neither could accurately measure the size of NPs featuring a broad size distribution, e.g., aggregates. Because many real-world NP samples consist of aggregates, this finding was of considerable concern. The data showed that the protocols introduced errors into the measurement by either inducing agglomeration artefacts or providing a skewed size distribution towards small particles (skewing artefact). The focus of this work was to develop and apply a mathematical refinement to correct the skewing artefact. This refinement provided a much improved agreement between EM and a reference methodology, when applied to the measurement of synthetic amorphous silica NPs. Further investigation, highlighted the influence of NP chemistry on the refinement. This study emphasised the urgent need for greater and more detailed consideration regarding the sample preparation of NP aggregates to routinely achieve accurate measurements by EM. This study also provided a novel refinement solution applicable to the size characterisation of silica and c让rate-coated gold NPs featuring broad size distributions. With further research, this approach could be extended to other NP types.

关键词： Nanoparticles aggregates Measurement Electron microscopy Sample preparation Artefacts

Mechanochemical Dispersion of Nanodiamond aggregates in Aqueous Media

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Journal of Materials Science & Technology 2005年第1期21卷 109-112页

作者： XiangyangXU YongweiZHU BaichunWANG ZhimingYU ShengzhongXIE R&DCenter ChangshaResearchInstituteofMiningandMetallurgyChangsha410012China SchoolofMaterialsScienceandEngineering CentralSouthUniversityChangsha410083China//R&DCenterChangshaResearchInstituteofMiningandMetallurgyChangsha410012China SchoolofMaterialsScienceandEngineering CentralSouthUniversityChangsha410083China

A technology of mechanochemical treatment (MCT) is introduced to modify nanodiamond (ND) surface aiming to obtaining a stable suspension with well-dispersed ND particles in aqueous medium. ND investigated in this paper is a purified product of nanometer-sized diamond synthesized by explosive detonation. As obvious aggregation and sediment were observed when the sample was added into deionized water, it is crucial to conduct deaggregation and dispersion investigations. Amid a series of mechanical treatments, i.e. grinding, stirring, ultrasonic and classification, some reagents are introduced to modify the newly created surface during aggregates comminution. For the co-effects of mechanical forces and surfactants, the mean size of particles was reduced and a stable system containing ND with narrow size distribution was prepared. Mechanism of surface reaction and modification are discussed, while AFM, Zetasizer3000HS, XRD, XPS and FTIR are utilized for the analysis. The functional chemical structure of ND particle surface and surface electrical property changed during the modification processes, and the dispersion character and stability of suspension can consequently be improved.

关键词： aggregates Deaggregation Dispersion Mechanochemical treatment Nanodiamond