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Distributions and risk assessment of heavy metals in solid waste in lead-zinc mining areas and across the soil, water body, sediment and agricultural product ecosystem in their surrounding areas

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China Geology 2025年第1期8卷 92-106页

作者： Zhi-qiang Wu hai-ying Li Liu-yan Lü Guo-jun Liang Ting-ting Wu Jiang-xia Zhu No.117 Geological Team Bureau of Geology and Mineral Exploration and Development of Guizhou ProvinceGuiyang 550023China Ecological Environment Monitoring Center of Guizhou Province Guiyang 550023China Guizhou Institute of Geological Survey Guiyang 550081China Environmental Engineering Assessment Center of Anshun City Anshun 561000China Environmental Emergency Center of Anshun City Anshun 561000China

To identify the root causes of heavy metal contamination in soils as well as prevent and control such contamination from its sources,this study explored the accumulation patterns and ecological risks of heavy metals like Cd and Pb in solid waste in mining areas and across the water body,sediment,soil and agricultural product ecosystem surrounding the mining *** on the residual solid waste samples in lead-zinc deposits in a certain area of Guizhou Province,along with samples of topsoils,irrigation water,river sediments,and crops from surrounding *** study analyzed the distributions of eight heavy metals,i.e.,Cd,As,Cr,Hg,Pb,Zn,Cu,and Ni,in the samples through field surveys and sample ***,this study assessed the contamination levels and ecological risks of heavy metals in soils,sediments,and agricultural products using methods such as the single-factor index,Nemerow composite index,and potential ecological risk *** results indicate that heavy metals in the solid waste samples all exhibited concentrations exceeding their risk screening values,with 60%greater than their risk intervention *** soils and sediments demonstrate slight and moderate comprehensive ecological risks of heavy *** single-factor potential ecological risks of heavy metals in both the soil and sediment samples decreased in the order of Hg,Cd,Pb,As,Cu,Zn,Cr,and Ni,suggesting the same sources of heavy metals in the soils and *** of the agricultural product samples exhibited over-limit concentrations of heavy metals dominated by Cd,Pb,Ni,and Cr,excluding Hg and *** agricultural product assessment using the Nemerow composite index reveals that 35%of the agricultural product samples reached the heavy metal contamination level,implying that the agricultural products from farmland around the solid waste dumps have been contaminated with heavy *** eight heavy metals in the soil,sediment,and agricultural product samples manifested hig

关键词： Lead-zinc mining area Solid waste Soil Water body Sediment Agricultural product Nemerow composite index Cd,Pb,Ni,Cr elements Heavy metal contamination Ecological risk assessment Coefficients of variation(CVs) Environmental restoration engineering

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Single-atom“surgery”on chiral all-dialkynyl-protected superatomic silver nanoclusters

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Science Bulletin 2025年第3期70卷 365-372页

作者： Chengkai Zhang Wei-Dan Si Wei-Dong Tian Wan-jun Xiao Zhi-Yong gao Zhi Wang Chen-Ho Tung Di Sun School of Chemistry and Chemical Engineering State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiang 453007China

The manipulation of single atom within the metallic kernel of nanoclusters has attracted considerable attention due to its potentials to elucidate kernel-based structure-property relationships at the single-atom ***,new-designed chiral bialkynyl ligands,have been chosen as protective agents to isolate two pairs of 8-electron superatomic silver nanoclusters,R/S-Ag39 and R/S-Ag40.X-ray diffraction analysis reveals that Ag39 and Ag40 with the same number of chiral ligands,possess a closely analogous silver skeleton but a single-atomic *** incorporation of an extra Ag40th atom into Ag40 evokes two significant changes of structure and property compared to Ag39:(i)a reduction in the symmetry of the entire nanocluster,resulting in an enhancement of kernel-related asymmetry g-factor;(ii)a regulation of the transitions(1P→1D and Ligand(π)→1D)of excited state,leading to a second near-infrared(NIR-II,1000-1700 nm)phosphorescent emission red-shift from 1088 to 1150 *** work not only provides vital insights into the relationship between structures and ground/excited states chiroptical activities at the single-atom level,but also presents bialkynyl as a promising stabilizing agent for building superatomic metal nanoclusters.

关键词： Single atom manipulation Chiral bialkynyl ligands Superatomic silver nanoclusters NIR-Il phosphorescence

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Possible coexistence of superconductivity and topological electronic states in 1T-RhSeTe

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Chinese Physics B 2025年第2期34卷 111-116页

作者： Tengdong Zhang Rui Fan Yan gao Yanling Wu Xiaodan Xu Dao-Xin Yao jun Li Hebei Key Laboratory of Microstructural Material Physics School of ScienceYanshan UniversityQinhuangdao 066004China State Key Laboratory of Optoelectronic Materials and Technologies Guangdong Provincial Key Laboratory of Magnetoelectric Physics and DevicesSchool of PhysicsSun Yat-Sen UniversityGuangzhou 510275China

Transition metal dichalcogenides(TMDs), exhibit a range of crystal structures and topological quantum states. The1T phase, in particular, shows promise for superconductivity driven by electron–phonon coupling(EPC), strain, pressure,and chemical doping. In this theoretical investigation, we explore 1T-Rh Se Te as a novel type of TMD superconductor with topological electronic states. The optimal doping structure and atomic arrangement of 1T-Rh Se Te are *** spectrum calculations validate the integrity of the constructed doping structure. The analysis of the electron–phonon coupling using the electron–phonon Wannier(EPW) method has confirmed the existence of a robust electron–phonon interaction in 1T-Rh Se Te, resulting in total EPC constant λ = 2.02, the logarithmic average frequency ω_(log)= 3.15 me V and T_c = 4.61 K, consistent with experimental measurements and indicative of its classification as a BCS *** band structure analysis revealed the presence of Dirac-like band crossing points. The topological non-trivial electronic structures of the 1T-Rh Se Te are confirmed via the evolution of Wannier charge centers(WCCs) and time-reversal symmetryprotected topological surface states(TSSs). These distinctive properties underscore 1T-Rh Se Te as a possible candidate for a topological superconductor, warranting further investigation into its potential implications and applications.

关键词： superconductivity topological electronic state transition metal dichalcogenides

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An in-depth understanding of the role and mechanisms of T cells in immune organ aging and age-related diseases

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Science China(Life Sciences) 2025年第2期68卷 328-353页

作者： Yudai Xu Zijian Wang Shumin Li jun Su Lijuan gao junwen Ou Zhanyi Lin Oscar junhong Luo Chanchan Xiao Guobing Chen Department of Microbiology and Immunology School of MedicineInstitute of Geriatric ImmunologySchool of MedicineJinan UniversityGuangzhou 510632China Key Laboratory of Viral Pathogenesis&Infection Prevention and Control(Jinan University) Ministry of EducationGuangzhou 510632China Guangdong-Hong Kong-Macao Great Bay Area Geroscience Joint Laboratory School of MedicineJinan UniversityGuangzhou 510632China First Affiliated Hospital Jinan UniversityGuangzhou 510630China Anti Aging Medical Center Clifford HospitalGuangzhou 511495China Guangdong Provincial People’s Hospital(Guangdong Academy of Medical Sciences) Southern Medical UniversityGuangzhou 510080China Department of Systems Biomedical Sciences School of MedicineJinan UniversityGuangzhou 510632China The Sixth Affiliated Hospital of Jinan University(Dongguan Eastern Central Hospital) Jinan UniversityDongguan 523000China Zhuhai Institute of Jinan University Jinan UniversityZhuhai 519070China

T cells play a critical and irreplaceable role in maintaining overall ***,their functions undergo alterations as individuals *** is of utmost importance to comprehend the specific characteristics of T-cell aging,as this knowledge is crucial for gaining deeper insights into the pathogenesis of aging-related diseases and developing effective therapeutic *** this review,we have thoroughly examined the existing studies on the characteristics of immune organ ***,we elucidated the changes and potential mechanisms that occur in T cells during the aging ***,we have discussed the latest research advancements pertaining to T-cell agingrelated *** findings provide a fresh perspective for the study of T cells in the context of aging.

关键词： T cell aging immune organ age-related diseases

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Network pharmacology and in vivo study:Unraveling the therapeutic mechanisms of Panax ginseng in potentially treating ulcerative colitis

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World Journal of Gastroenterology 2025年第9期31卷 83-99页

作者： Yan Qin Rui-Ya Zhang Yu Zhang Yi-Qing Zhao hai-Feng Hao jun-Ping Wang Department of Gastroenterology Shanxi Provincial People’s Hospital Affiliated to Shanxi Medical UniversityTaiyuan 030012Shanxi ProvinceChina Department of Urology The First Hospital of Shanxi Medical UniversityTaiyuan 030012Shanxi ProvinceChina

BACKGROUND Ulcerative colitis(UC),a chronic and challenging condition,necessitates the development of more effective treatments owing to the unsatisfactory efficacy and side effects associated with current *** Chinese medicine(TCM),known for its multi-stage and multi-targeted approach,has a long history in treating gastrointestinal diseases and offering a promising alternative UC *** ginseng(***),a commonly used remedy for UC in TCM,exemplifies this potential,although the specific components and mechanisms through which its therapeutic effects are exerted remain to be fully elucidated,highlighting the need for further research to unlock its full potential as a treatment *** To investigate the key constituents and biological pathways through which *** exerts therapeutic effects on *** Network pharmacology investigated the UC-alleviating mechanism of ***,including“active ingredient-target-disease”network analysis,and Gene Ontology and Kyoto Encyclopedia of Genes and Genomes enrichment ***(PD;active ingredient of ***)was tested in a mouse model of 3%dextran sulfate sodium-induced UC,with assessments of body weight,Disease Activity Index scores,and colon *** and intestinal barrier integrity were analyzed via hematoxylin-eosin and Alcian blue and periodic acid-Schiff staining,immunohistochemistry,real time-quantitative PCR,and western *** By integrating and analyzing the targets of *** and UC,15 critical hub genes were *** Encyclopedia of Genes and Genomes pathway analysis revealed the mechanisms involved to be linked to MAPK and PI3K-Akt *** the 10 main active ingredients identified as potentially effective,PD was most abundant and was validated in vivo to mitigate weight loss,reduce Disease Activity Index scores,and prevent colon *** also reduced inflammation and suppressed expression of pro-inflammatory cytokines and me

关键词： Ulcerative colitis Panax ginseng Network pharmacology Panaxadiol MAPK NF-κB AMPK NRF2

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物理气相输运法生长AlN六方微晶柱

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无机材料学报 2017年第2期32卷 215-218页

作者：王华杰刘学超孔海宽忻隽高攀卓世异施尔畏中国科学院上海硅酸盐研究所上海201800 中国科学院大学北京100049

采用物理气相输运法（Physical Vapor Transport, PVT）, 在1700 - 1850°C生长温度下制备出AlN六方微晶柱; 晶柱长度在1 cm左右, 宽度在200 -400 μm, 光学显微镜下观察为六棱柱形状并呈透明浅黄色光泽; 扫描电子显微镜和原子力显微镜... 详细信息

采用物理气相输运法（Physical Vapor Transport, PVT）, 在1700 - 1850°C生长温度下制备出AlN六方微晶柱; 晶柱长度在1 cm左右, 宽度在200 -400 μm, 光学显微镜下观察为六棱柱形状并呈透明浅黄色光泽; 扫描电子显微镜和原子力显微镜测试表明： AlN晶柱表面为整齐台阶状形貌, 台阶宽度为2- 4 μm, 高度在几个纳米; 拉曼光谱测试AlN晶柱具有良好结晶质量。PVT 法生长AlN六方微晶柱主要是在偏低温度下AlN晶体生长速率较慢, Al原子和N原子有足够时间迁移到能量较低位置结晶生长, 进而沿着〈0001〉方向形成柱状结构。AlN六方微晶柱是对一维半导体材料领域的补充, 通过对晶柱尺寸及杂质控制的进一步研究, 有望在微型光电器件领域表现出应用价值。

关键词： III-V族半导体氮化铝(AlN)晶体六方微米柱物理气相输运(PVT)

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Insights into microscopic oil occurrence characteristics in shales from the Paleogene Funing Formation in Subei Basin, China

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Petroleum Science 2025年第1期22卷 55-75页

作者： jun-Jie Wang Peng-Fei Zhang Shuang-Fang Lu Zi-Zhi Lin Wen-Biao Li jun-Jian Zhang Wei-Zheng gao Neng-Wu Zhou Guo-Hui Chen Ya-Jie Yin Han Wu Sanya Offshore Oil & Gas Research Institute of Northeast Petroleum University College of Earth Science and Engineering Shandong University of Science and Technology Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development Ministry of Education Northeast Petroleum University School of Geoscience China University of Petroleum (East China)

The microscopic occurrence characteristics primarily constrain the enrichment and mobility of shale *** study collected the lacustrine shales from the Palaeogene Funing Formation in the gaoyou Sag, Subei Basin. Conventional and multistage Rock-Eval, scanning electron microscopy, and nuclear magnetic resonance(NMR) T1-T2were performed to analyze the contents and occurrence characteristics of shale oil. Low-temperature nitrogen adsorption-desorption(LTNA/D) experiments were conducted on the shales before and after extraction. The relationships between shale oil occurrence with organic matter and pore structures were then discussed. Predominantly, the shale oil in the Funing Formation is found within fractures, with secondary occurrences in interparticle pores linked to brittle minerals and sizeable intraparticle pores associated with clay minerals. The selected shales can be categorized into two types based on the nitrogen isotherms. Type A shales are characterized by high contents of felsic and calcareous minerals but low clay minerals, with larger TOC and shale oil values. Conversely, Type B shales are marked by abundant clay minerals but diminished TOC and shale oil contents. The lower BET specific surface area(SSA), larger average pore diameter, and simpler pore surfaces and pore structures lead to the Type A shales being more conducive to shale oil enrichment and mobility. Shale oil content is predominantly governed by the abundance of organic matter, while an overabundance of organic matter typically equates to a reduced ratio of free oil and diminished fluidity. The BET SSA, volumes of pores less than 25 and 100 nm at extracted state all correlate negatively with total and adsorbed oil contents but display no correlation with free oil, while they have positive relationships with capillary-bound ***, pore water is mainly saturated in micropores(<25 nm) and minipores(25-100 nm), as well as adsorbed oil, while free oil, i.e., bound and movable

关键词： Occurrence characteristic Shale oil content Pore structure Low-temperature nitrogen adsorption-desorption gaoyou Sag

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The Mechanism of Heating Rate on the Secondary Recrystallization Evolution in Grain Oriented Silicon Steel

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 275-282页

作者： gao Qian LI jun WANG Xianhui CAO Laifu GONG Jian LI Bo Central Iron and Steel Research Institute Group Beijing 100081China Shougang Zhixin Electromagnetic Material R&D(Beijing)Co. Ltd.Beijing 101300China Beijing Shougang Co. Ltd.Qian’an 064404China

Grain-oriented silicon steels were prepared at different heating rates during high temperature annealing,in which the evolution of magnetic properties,grain orientations and precipitates were *** illustrate the Zener factor,the diameter and number density of precipitates of interrupted testing samples were statistically *** effect of precipitate ripening on the Goss texture and magnetic property was *** indicated that the trend of Zener factor was similar under different heating rates,first increasing and then decreasing,and that the precipitate maturing was greatly inhibited as the heating rate *** recrystallization was developed at the temperature of 1010℃when a heating rate of 5℃/h was used,resulting in Goss,Brass and{110}oriented grains growing abnormally and a magnetic induction intensity of ***,increasing the heating rate to 20℃/h would inhibit the development of undesirable oriented grains and obtain a sharp Goss ***,when the heating rate was extremely fast,such as 40℃/h,poor secondary recrystallization was developed with many island grains,corresponding to a decrease in magnetic induction intensity to 1.87 *** a suitable heating rate of 20℃/h,the sharpest Goss texture and the highest magnetic induction of 1.94 T with an onset secondary recrystallization temperature of 1020℃were found among the experimental variables in this *** heating rate affected the initial temperature of secondary recrystallization by controlling the maturation of precipitates,leading to the deviation and dispersion of Goss texture,thereby reducing the magnetic properties.

关键词： high temperature annealing heating rate secondary recrystallization grain oriented silicon steel

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Stable copper boron–imidazolate cage as Cu-riched enzyme for highly efficient electrocatalytic CO2 reduction to ethylene

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Science China Chemistry 2025年第3期 943-950页

作者： jun-Qiang Chen Qiao-Hong Li Qin-Long Hong Ping Shao hai-Xia Zhang Jian Zhang State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of Sciences

Single-atom catalyst has garnered widespread attention to mimic mature enzymes due to its well-defined atomic structure and coordination ***,since the carbon–carbon（C–C） coupling reactions require synergistic catalysis of multiple sites,single-atom catalysts suffer from insufficient active sites and unclear reaction *** the reaction intermediates in a precisely targeted pocket through careful metal–organic cage design is therefore ***,we prepare a tetrahedral [Cu6L4]-type boron–imidazolate cage integrating highly active Cu sites and optimized cavity,which exhibits enzyme like specific catalytic performance in electrochemical CO2reduction reaction（CO2RR） to enhance the selectivity of *** analyses and computational calculations suggest that the single Cu site together with neighboring boron–imidazolate ligands provides suitably synergistic effects that enable the energetically favorable formation of an*COCHO intermediate,a key step determining *** a result,the [Cu6L4]-type cage of BIC-145 achieves a Faradaic efficiency of 28% for C2H4maintaining an average current density of -3.54 m A cm-2over a 5-hour electrolysis *** work represents the first example for studying single-metal site catalysts with ultra-low coordination numbers through the rational design of metal–organic cages.

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Enantioselective synthesis of indenols via rhodium(III)-catalyze C–H activation/annulation of ketones with alkynes

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Science China Chemistry 2025年

作者： Bo-Bo Gou Wen-Jie Shen Yuan-jun gao Qing Gu Shu-Li You New Cornerstone Science Laboratory State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of Sciences

Molecular chirality is a cornerstone of modern chemistry and it has a profound impact on biological activity, chemical reactivity and physical property. Developing asymmetric synthesis methods to efficiently and precisely produce chiral molecules remains a challenging issue in organic chemistry. In recent years, transition-metal-catalyzed enantioselective C–H activation has emerged as an efficient strategy for the rapid access to valuable chiral compounds from readily available feedstocks in an atom-and step-economic manner. Here we report a rhodium(III)-catalyzed C–H activation/annulation of ketones with alkynes. This method features mild conditions, wide substrate scope, and perfect atom economy, affording a series of chiral tertiary indenols in excellent yields and enantioselectivity(up to 98% yield and 99% ee). Combined experimental and computational studies revealed the turnover-limiting step of the reaction and the origins of enantioselectivity and regioselectivity.

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