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Resolving the influence of nitrogen abundances on sediment organic matter in macrophyte-dominated lakes, using fluorescence spectroscopy

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Journal of Environmental Sciences 2015年第1期27卷 197-206页

作者： Xin Yao Shengrui Wang Lixin Jiao caihong yan Xiangcan Jin State Key Laboratory of Environmental Criteria and Risk Assessment State Environmental Protection Key Laboratory for Lake Pollution Control Research Center of Lake Eco-environment Chinese Research Academy of Environmental Sciences School of Environment and Planning Liaocheng University

A controlled experiment was designed to resolve the influence of nitrogen abundance on sediment organic matters in macrophyte-dominated lakes using fluorescence *** biomass showed coincident growth trends with time, but different variation rates with nitrogen treatment. All plant growth indexes with nitrogen addition（N, NH4Cl100, 200, 400 mg/kg, respectively） were lower than those of the control group. Four humiclike components, two autochthonous tryptophan-like components, and one autochthonous tyrosine-like component were identified using the parallel factor analysis model. The results suggested that the relative component changes of fluorescence in the colonized sediments were in direct relation to the change of root biomass with time. In the experiment, the root formation parameters of the plants studied were significantly affected by adding N in sediments, which may be related to the reason that the root growth was affected by N *** a low concentration of N to sediments can play a part in supplying nutrients to the plants. However, the intensive uptake of NH4^＋may result in an increase in the intracellular concentration of ammonia, which is highly toxic to the plant cells. Hence, our experiment results manifested that organic matter cycling in the macrophyte-dominated sediment was influenced by nitrogen enrichment through influencing vegetation and relevant microbial activity.

关键词： Colonized sediment Non-colonized sediment Nitrogen enrichment Submersed macrophyte Sediment organic matter Fluorescence feature

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两株马立克病毒的分离鉴定及其主要致病基因分析

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中国动物传染病学报 2024年第2期32卷 65-72页

作者：闫彩虹金文杰刘文博羊扬钱琨王志强彭大新扬州大学兽医学院江苏省动物重要疫病与人兽共患病防控协同创新中心扬州225009

为了解国内鸡群马立克病毒(MDV)流行毒株的分子特征,采用细胞培养法对马立克病疑似病鸡抗凝血进行MDV分离,间接荧光法鉴定MDV血清型,PCR扩增分离病毒的meq和pp38两个主要致病基因,所得序列与MDV参考毒株的序列进行比对分析。结果显示,... 详细信息

为了解国内鸡群马立克病毒(MDV)流行毒株的分子特征,采用细胞培养法对马立克病疑似病鸡抗凝血进行MDV分离,间接荧光法鉴定MDV血清型,PCR扩增分离病毒的meq和pp38两个主要致病基因,所得序列与MDV参考毒株的序列进行比对分析。结果显示,共分离鉴定出2株MDV I型毒株,分别命名为JS0316和JS0424。meq基因编码的氨基酸序列结果显示,2个MDV分离株缺乏弱毒疫苗株的特征(A71S、P194-),具有MDV强毒分离株的分子特征(D80Y、V115A、T139A、P176R和P217A)。同时,JS0316 Meq蛋白出现Q93R和V123A突变,pp38蛋白出现L98I和F240S突变,而JS0424 Meq蛋白出现P217T突变,pp38蛋白出现W67G和V210A突变。因此,2株MDV均具有国内流行强毒株的分子特征,同时存在新的基因突变。

关键词：马立克病毒分离鉴定 meq pp38 序列分析

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Synthesis and molecular recognition characteristics of a tetrapodal benzene cage

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Chinese Chemical Letters 2024年第8期35卷 240-244页

作者： caihong Mao yanfeng He Xiaohan Wang yan Cai Xiaobo Hu Key Laboratory of the Ministry of Education for Advanced Catalysis Materials College of Chemistry and Materials ScienceZhejiang Normal UniversityJinhua 321004China

In this contribution,we describe the preparation and recognition characteristics of a novel tetrapodal benzene cage(1).The cage can express a wide recognition range without losing selectivity for the object of appropriate size and functional *** key to obtaining the desired structural isomer of 1 is the synthesis and isolation of the o-bis(bromomethyl)benzene precursor(5).Three distinct guests,F^(−)(ex-tremely small size),d-lactate(appropriate size)and l-Asp(branched shape),were selected as examples to demonstrate the recognition characteristics of *** NMR titration studies,they all expressed good binding affinity(K>10^(5) L/mol)in competitive medium(10%DMSO/THF),indicating that 1 has a wide recognition *** highest binding constant was observed for d-lactate,revealing that 1 has good selectivity for d-lactate versus F^(−)and ***,the NMR titration study of F^(−)in DMSO indicates 1 can achieve different binding modes(1:1 and 2:1 guest-host)for small-sized guests,which allows for the further development of binary binding properties and thereafter applications in the field of catalysis.

关键词： Cage molecules Host-guest chemistry Multi-step organic synthesis d-Lactate recognition l-Asp recognition

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Development and Deformation Characteristics of Large Ancient Landslides in the Intensely Hazardous Xiongba-Sela Section of the Jinsha River, Eastern Tibetan Plateau, China

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Journal of Earth Science 2024年第3期35卷 980-997页

作者： Yiqiu yan Changbao Guo yanan Zhang Zhendong Qiu caihong Li Xue Li Institute of Geomechanics Chinese Academy of Geological SciencesBeijing 100081China Key Laboratory of Active Tectonics and Geological Safety Ministry of Natural ResourcesBeijing 100081China

The upstream Jinsha River,located in the eastern Tibetan Plateau,has been experiencing intense geological hazards characterized by a high density of ancient landslides,significant deformation and reactivation *** this study,remote sensing interpretation,field investigations,and Small Baseline Subset Interferometric Synthetic Aperture Radar(SBAS-InSAR)technologies have been *** a 17 km stretch of the Jinsha River,specifically in the Xiongba-Sela segment,16 large-scale ancient landslides were identified,9 of which are currently undergoing creeping ***,the Sela and Xiongba ancient landslides exhibit significant deformation,with a maximum deformation rate of-192 mm/yr,indicating a high level of sliding *** volume of the Sela ancient landslide is estimated to be 1.8×108 to 4.5×108 m3,and characterized by extensive fissures and long-term creeping *** SBAS-InSAR results revealed significant spatial variations in the deformation of the Sela ancient landslide,generally displaying two secondary zones of intense deformation,and landslide deformation exhibits nonlinear behavior with *** January 2016 and February 2022,Zone III1 on the southwest side of the Sela ancient landslide,experienced a maximum cumulative deformation of-857 mm,with a maximum deformation rate of-108 mm/*** III2,on the northeast side of the Sela ancient landslide,the maximum cumulative deformation was-456 mm,with a maximum deformation rate of-74 mm/yr;among these,the H2 and H4 secondary bodies on the south side of III1 are in the accelerative deformation stage and at the Warn warning *** propose that the large-scale flood and debris flow disasters triggered by the Baige landslide-dammed lake-dam broken disaster chain in Tibetan Plateau during October and November 2018 caused severe erosion at the foot of downstream *** far-field triggering effect accelerated the creep of the downstream ancient ***,the defo

关键词： Jinsha River SBAS-InSAR landslides surface deformation disasters.

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Fe-N-C core-shell catalysts with single low-spin Fe(Ⅱ)-N_(4)species for oxygen reduction reaction and high-performance proton exchange membrane fuel cells

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Journal of Energy Chemistry 2024年第6期93卷 538-546,I0013页

作者： yan Wan Linhui Yu Bingxin yang caihong Li Chen Fang Wei Guo Fang-Xing Xiao yangming Lin Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Institute of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamen 361021FujianChina CAS Key Laboratory of Urban Pollutant Conversion Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021FujianChina Fujian Institute of Research on the Structure of Matter Chinese Academy of SciencesFuzhou 350002FujianChina College of Materials Science and Engineering Fuzhou UniversityNew CampusMinhou 350108FujianChina College of Chemistry and Materials Science Fujian Normal UniversityFuzhou 350117FujianChina

Fe-N-doped carbon materials(Fe-N-C)are promising candidates for oxygen reduction reaction(ORR)relative to Pt-based catalysts in proton exchange membrane fuel cells(PEMFCs).However,the intrinsic contributions of Fe-N_(4)moiety with different chemical/spin states(e.g.D1,D2,D3)to ORR are unclear since various states coexist *** the present work,Fe-N-C core-shell nanocatalyst with single lowspin Fe(Ⅱ)-N_(4)species(D1)is synthesized and identified with ex-situ ultralow temperature Mossbauer spectroscopy(T=1.6 K)that could essentially differentiate various Fe-N_(4)states and invisible Fe-O *** quantifying with CO-pulse chemisorption,site density and turnover frequency of Fe-N-C catalysts reach 2.4×10^(-9)site g^(-1)and 23 e site~(-1)s^(-1)during the ORR,***-wave potential(0.915V_(RHE))of the Fe-N-C catalyst is more positive(approximately 54 mV)than that of Pt/***,we observe that the performance of PEMFCs on Fe-N-C almost achieves the 2025 target of the US Department of Energy by demonstrating a current density of 1.037 A cm^(-2)combined with the peak power density of 0,685 W cm^(-2),suggesting the critical role of Fe(Ⅱ)-N_(4)site(D1).After 500 h of running,PEMFCs still deliver a power density of 1.26 W cm^(-2)at 1.0 bar H_(2)-O_(2),An unexpected rate-determining step is figured out by isotopic labelling experiment and theoretical *** work not only offers valuable insights regarding the intrinsic contribution of Fe-N_(4)with a single spin state to alkaline/acidic ORR,but also provides great opportunities for developing high-performance stable PEMFCs.

关键词： Fuel cells Oxygen reduction reaction Non-platinum group metals(PGMs) Isotopic labelling Active site TOF

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The Effect of Case Management Model on the Application of Pancreatic Cancer Surgery Patients and the Recovery of Gastrointestinal Function

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Journal of Clinical and Nursing Research 2024年第7期8卷 241-247页

作者： Zhe yan caihong Li Department of Nursing Beijing Tsinghua Changgeng HospitalTsinghua UniversityBeijing 102218China

Objective:To evaluate the effect of the case management model on patients operated for pancreatic ***:90 pancreatic cancer surgery patients admitted to the hospital between January 2022 and June 2023 were selected and grouped by randomized numerical *** 45 cases in the observation group,case management mode was adopted,and for 45 cases in the intervention group,conventional nursing care was chosen to compare the indexes of gastrointestinal function ***:The recovery time of all gastrointestinal functions of the observation group was shorter than that of the intervention group;after nursing,the psychological state score of the observation group was lower than that of the intervention group,the self-efficacy score was higher than that of the intervention group and the rate of complications was lower than that of the intervention group(P<0.05).Conclusion:The case management model can promote the recovery of gastrointestinal function in patients with pancreatic cancer surgery and its nursing feasibility is high.

关键词： Case management Pancreatic cancer surgery Gastrointestinal function recovery

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Characterization and spatial analysis of coseismic landslides triggered by the Luding Ms 6.8 earthquake in the Xianshuihe fault zone, Southwest China

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Journal of Mountain Science 2024年第1期21卷 160-181页

作者： GUO Changbao LI caihong yanG Zhihua NI Jiawei ZHONG Ning WANG Meng yan Yiqiu SONG Deguang ZHANG yanan ZHANG Xianbing WU Ruian CAO Shichao SHAO Weiwei Institute of Geomechanics Chinese Academy of Geological SciencesBeijing 100081China Key Laboratory of Active Tectonics and Geological Safety Ministry of Natural ResourcesBeijing 100081China Research Center of Neotectonism and Crustal Stability China Geological SurveyBeijing 100081China School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China Sichuan Institute of Geological Survey Chengdu 610081China

On September 5, 2022, a magnitude Ms 6.8 earthquake occurred along the Moxi fault in the southern part of the Xianshuihe fault zone located in the southeastern margin of the Tibetan Plateau,resulting in severe damage and substantial economic loss. In this study, we established a coseismic landslide database triggered by Luding Ms 6.8 earthquake, which includes 4794 landslides with a total area of 46.79 km^(2). The coseismic landslides primarily consisted of medium and small-sized landslides, characterized by shallow surface sliding. Some exhibited characteristics of high-position initiation resulted in the obstruction or partial obstruction of rivers, leading to the formation of dammed lakes. Our research found that the coseismic landslides were predominantly observed on slopes ranging from 30° to 50°, occurring at between 1000 m and 2500 m, with slope aspects varying from 90° to 180°. Landslides were also highly developed in granitic bodies that had experienced structural fracturing and strong-tomoderate weathering. Coseismic landslides concentrated within a 6 km range on both sides of the Xianshuihe and Daduhe fault zones. The area and number of coseismic landslides exhibited a negative correlation with the distance to fault lines, road networks, and river systems, as they were influenced by fault activity, road excavation, and river erosion. The coseismic landslides were mainly distributed in the southeastern region of the epicenter, exhibiting relatively concentrated patterns within the IX-degree zones such as Moxi Town, Wandong River basin, Detuo Town to Wanggangping Township. Our research findings provide important data on the coseismic landslides triggered by the Luding Ms 6.8 earthquake and reveal the spatial distribution patterns of these landslides. These findings can serve as important references for risk mitigation, reconstruction planning, and regional earthquake disaster research in the earthquake-affected area.

关键词： Luding earthquake Coseismic landslides Remote sensing interpretation Spatial distribution Xianshuihe fault Earthquake fault

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云南省农村剩余劳动力转移“推力——拉力”分析

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特区经济 2010年第3期 205-206页

作者：闫彩红红河学院云南蒙自661100

农村剩余劳动力的转移取决于两种力量:推力和拉力。文章分析了云南省农村剩余劳动力转移的推力、拉力因素,认为推力、拉力没有能够协调并进,使农村剩余劳动力的转移面临决策困境,进而导致了农村剩余劳动力的转移效率不高。

关键词：农村剩余劳动力推力拉力

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代理冲突、内外薪酬差距与并购商誉

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审计与经济研究 2023年第4期38卷 53-62页

作者：陈耿严彩红重庆大学经济与工商管理学院重庆400030 重庆大学公司财务与会计治理创新研究院重庆400030 四川德阳经济技术开发区商务局四川德阳618000

以2012—2020年A股上市公司为研究样本,以商誉的准则规定为基础,从管理层代理冲突与内外薪酬差距角度研究商誉的形成机制、影响因素及经济后果。实证结果表明,管理层代理冲突越严重,企业通过并购形成的商誉规模越大。提高内部薪酬差距... 详细信息

以2012—2020年A股上市公司为研究样本,以商誉的准则规定为基础,从管理层代理冲突与内外薪酬差距角度研究商誉的形成机制、影响因素及经济后果。实证结果表明,管理层代理冲突越严重,企业通过并购形成的商誉规模越大。提高内部薪酬差距可以弱化代理冲突与并购商誉规模之间的正相关关系,发挥治理作用;而对于外部薪酬差距,正向差距不会产生明显影响,负向差距越大越会加剧代理冲突与商誉规模之间的正相关关系。进一步研究发现,代理冲突越严重的公司,其商誉越有可能在后续出现大额减值现象,并对公司绩效产生负面影响。研究结论有助于进一步从代理冲突及管理层薪酬结构的视角客观认识商誉在形成过程中受到的影响,帮助企业从优化内外薪酬差距的角度来约束商誉中非合理部分的形成,降低企业风险。

关键词：代理冲突并购商誉管理层薪酬薪酬差距公司绩效企业风险

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论社会主义发展市场经济的逻辑脉络

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商业时代 2011年第20期 4-5页

作者：闫彩红红河学院政治学与国际关系学院副教授云南蒙自661100

"社会主义也可以搞市场经济"思想是社会主义市场经济理论的前提和基础。"社会主义也可以搞市场经济"思想逻辑脉络清晰,从"贫穷不是社会主义,发展太慢也不是社会主义"出发,经过一系列艰难探索,得出"社会主义也可以搞市场经济"的结论,社... 详细信息

"社会主义也可以搞市场经济"思想是社会主义市场经济理论的前提和基础。"社会主义也可以搞市场经济"思想逻辑脉络清晰,从"贫穷不是社会主义,发展太慢也不是社会主义"出发,经过一系列艰难探索,得出"社会主义也可以搞市场经济"的结论,社会主义国家搞市场经济,最终目标是"发展生产力,实现共同富裕"。

关键词：社会主义市场经济逻辑脉络共同富裕

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