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Contemporary Approaches toα,β-Dehydroamino Acid Chemical Modifications

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Chemical Research in Chinese Universities 2021年第5期37卷 1044-1054页

作者： ZHANG Mengqian HE Peiyang li yanmei Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology Department of ChemistryTsinghua UniversityBeijing100084P.R.China Beijing Institute for Brain Disorders Beijing100069P.R.China Center for Synthetic and Systems Biology Tsinghua UniversityBeijing100084P.R.China

As one of the most common unnatural amino acids(uAAs),α,β-dehydroamino acids(α,β-dhAAs)can be found in various ribosomally synthesized and post-translationally modified peptides(RiPPs)and other naturally occurring *** recent years,novel reactions forα,β-dhAA modification continue to *** to their unique electrophilicity different from 20 natural amino acids,α,β-dhAAs.

关键词： translational continue acids

Rationally designed amyloid inhibitors based on amyloid-related structural studies

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Chinese Chemical Letters 2023年第2期34卷 7-17页

作者： Jinjian Hu Yufen Zhao yanmei li Department of Chemistry Key Lab of Bioorganic Phosphorus Chemistry&Chemical BiologyTsinghua UniversityBeijing 100084China Beijing Institute for Brain Disorders Beijing 100069China Center for Synthetic and Systems Biology Tsinghua UniversityBeijing 100084China Institute of Drug Discovery Technology Ningbo UniversityNingbo 315221China

Amyloid proteins correlate with a series of degenerative diseases. Targeting amyloid aggregation has remained a hot topic in therapeutic studies. Numerous inhibitors have been developed, but very few have been approved for marketing. Meanwhile, the growing knowledge of amyloid structural characteristics provides a basis for the rational design of inhibitors. Here we introduce the high-resolution structural findings of amyloid fibrils in recent years and discuss the reported strategies toward rationally designed inhibitors based on amyloid-related structural studies.

关键词： Amyloid Amyloid structure Degenerative disease Amyloid inhibitor Rational design

Review and prospect of NiCo_(2)O_(4)-based composite materials for supercapacitor electrodes

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Journal of Energy Chemistry 2019年第4期28卷 54-78页

作者： yanmei li Xiao Han Tingfeng Yi Yanbing He Xifei li School of Chemistry and Chemical Engineering Anhui University of Technology School of Resources and Materials Northeastern University at Qinhuangdao Engineering Laboratory for the Next Generation Power and Energy Storage Batteries Graduate School at Shenzhen Tsinghua University Institute of Advanced Electrochemical Energy Xi'an University of Technology

Supercapacitors known as typical electrochemical capacitors have been considered as one of the most promising candidates of energy storage systems owing to their advantages such as high-power density,long life span and lower production *** electrode materials play a crucial role on properties of ***,many researches have been focused on the development of novel electrode materials for high-performance ***_2O_4as supercapacitor electrode material has drawn more and more attentions in recent years due to its outstanding advantages,such as high theoretical capacity,low cost,natural abundance and easy of ***,the NiCo_2O_4always suffer from severe capacity deterioration because of the low electrical conductivity and small surface ***,it is necessary to systematically and comprehensively summarize the progress in understanding and modifying NiCo_2O_4-based materials from various *** this review,the structure and synthesis method of NiCo_2O_4-based materials are discussed in *** then,the major goal of this review is to highlight new progress in using proposed strategies to improve the cycling stability and rate capacity of NiCo_2O_4-based materials,including synthesis,control of special morphologies and design of composite ***,an insight into the future research and development of Ni Co_2O_4-based materials for supercapacitors is prospected.

关键词： NiCo_(2)O_(4) Electrochemical performance Synthesis Morphology Supercapacitors

Fast and abundant in vitro spontaneous haustorium formation in root hemiparasitic plant Pedicularis kansuensis Maxim. (Orobanchaceae)

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Plant Diversity 2018年第5期40卷 226-231页

作者： Lei Xiang yanmei li Xiaolin Sui Airong li Yunnan Key Laboratory for Wild Plant Resources Department of Economic Plants and Biotechnology Kunming Institute of Botany Chinese Academy of Sciences Kunming 650201 China University of Chinese Academy of Sciences 19A Yuquan Road Beijing 100049 China

Haustorium formation is the characteristic feature of all parasitic plants and a vital process for successful *** investigations on haustorium initiation and development are constricted to induced processes by host-derived signals or synthetic *** haustorium formation in the absence of host signals,a process representing an early stage in the evolution of parasitic plants,remains largely *** of fast and frequent formation of spontaneous haustoria greatly hinders full understanding of haustorium formation in root *** this study,seedlings of Pedicularis kansuensis Maxim.,a facultative root hemiparasitic species in Orobanchaceae observed to produce many spontaneous haustoria,were grown in autoclaved water agar in the absence of any known haustoriuminducing *** aimed to test the temporal and developmental pattern of spontaneous haustorium ***,effects of sucrose supply and root contact on spontaneous haustorium formation were *** haustoria were observed starting from six days after germination,much earlier than previously reported root hemiparasites.A majority of the spontaneous haustoria formed on lateral *** of seedlings with spontaneous haustoria was 28.8% when grown on water agar plates,with a mean of four haustoria per seedling two weeks after *** formation by seedlings grown in water agar amended with 2% sucrose was more than twice of those without sucrose *** grown seedlings were able to develop spontaneous haustoria at similar levels as those grown with another conspecific *** view of the fast and abundant formation of spontaneous haustoria,*** may be developed as an excellent experimental system in future investigations for unraveling endogenous regulation of haustorium initiation and development in root hemiparasitic plants.

关键词： Spontaneous haustoria Root hemiparasitic plants Orobanchaceae Pedicularis Sucrose amendment

15^(th) Chinese International Peptide Symposium

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Chinese Chemical Letters 2018年第7期29卷 999-1000页

作者： Xuechen li Lei liu yanmei li Department of Chemistry The University of Hong Kong Department of Chemistry Tsinghua University

As one of the most important and influential peptide conferences in the world,Chinese International Peptide Symposium(CPS)was founded in 1990 and has been held every two years for14 consecutive *** July 4thto 6th,2018,the 15th CPS will be held in Shenzhen and hosted by Tsinghua *** conference will focus on the topics of"Peptide:Technological Innovation and a Better life",covering the synthesis,structure and function of peptides and proteins,peptide-based drug discovery,

关键词： 15th Chinese International Peptide Symposium this special issue

Mesoporous NiCo_2O_4 nanoneedles@MnO_2 nanoparticles grown on nickel foam for electrode used in high-performance supercapacitors

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Journal of Energy Chemistry 2019年第4期28卷 167-177页

作者： yanmei li Jingjing Pan Jinzhu Wu Tingfeng Yi Ying Xie School of Chemistry and Chemical Engineering Anhui University of Technology School of Resources and Materials Northeastern University at Qinhuangdao Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education School of Chemistry and Materials Science Heilongjiang University

Mesoporous NiCo_2O_4@MnO_2 nanoneedle arrays as electrode materials for supercapacitor grown on a conductive nickel foam were prepared by a facile hydrothermal route. The interconnected mesoporous structure of the NiCo_2O_4 nanoneedle arrays provides a large specific surface area for charge *** electrochemically active MnO_2 nanoparticles covered on the surface of NiCo_2O_4 nanoneedle result in a favorable synergistic storage effect because of charge redistribution at the NiCo_2O_4|MnO_2 interface,which reduces the interfacial polarization and facilitates ion diffusion. The initial specific capacitance of NiCo_2O_4@MnO_2(S2) is 1001 F g^(-1) at current density of 15 A g^(-1). The capacity retention of S2 is about87.4% after 4000 cycles, and the specific capacitance of S2 electrode only decreases from 1001 F g^(-1) to736 F g^(-1) even after 10,000 cycles. The first-principles calculations show that a chemical bonding between the NiCo_2O_4 and MnO_2 is not only helpful for stabilizing the composites but also leads to a charge redistribution at the interface, which may lead to a smaller interfacial polarization and thus beneficial for the interfacial capacity. The excellent electrochemical performance of NiCo_2O_4@MnO_2 composites(S2)can be ascribed to the high surface area, unique architecture, MnO_2 nanoparticle modification, reduced charge transfer resistance and stable interface between NiCo_2O_4 and MnO_2. The simple material synthesis and architectural design strategy provides new insights in opportunities to exhibit promising potential for practical application in energy storage.

关键词： Supercapacitor First-principles calculations Electrochemical performance Synergistic effect NiCo2O4

Recyclable Fe_(3)O_(4)@Polydopamine(PDA) nanofluids for highly efficient solar evaporation

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Green Energy & Environment 2022年第1期7卷 35-42页

作者： Qingmiao Wang Yi Qin Feifei Jia Shaoxian Song yanmei li Hubei Key Laboratory of Mineral Resources Processing and Environment Wuhan University of TechnologyWuhanHubei Province430070China Department of Mines Metallurgy and Geology EngineeringUniversity of GuanajuatoGuanajuato36000Mexico School of Resources and Environmental Engineering Wuhan University of TechnologyWuhanHubei Province430070China

Volumetric solar evaporations by using light-absorbing nanoparticles suspended in liquids(nanofluids)as solar absorbers have been widely regarded as one of the promising solutions for clean water production because of its high efficiency and low capital cost compared to traditional solar distillation ***,previous solar evaporation systems usually required highly concentrated solar irradiation and high capital cost,limiting the practical application on a large ***,for the first time in this work,polydopamine(PDA)-capped nano Fe_(3)O_(4)(Fe_(3)O_(4)@PDA)nanofluids were used as solar absorbers in a volumetric system for solar *** introduction of organic PDA to nano Fe_(3)O_(4)highly contributed to the high light-absorbing capacity of over 85%in wide ranges of 200–2400 nm because of the existence of numerous carbon bonds and pi(π)bonds in *** a result,high evaporation efficiency of 69.93%under low irradiation of 1.0 kW m^(-2)was *** to other nanofluids,Fe_(3)O_(4)@PDA nanofluids also provided an advantage in high unit evaporation ***,Fe_(3)O_(4)@PDA nanofluids showed excellent reusability and recyclability owing to the preassembled nano Fe_(3)O_(4),which significantly reduced the material *** results demonstrated that the Fe_(3)O_(4)@PDA nanofluids held great promising application in highly efficient solar evaporation.

关键词： Fe_(3)O_(4)@Polydopamine Nanofluids Volumetric solar evaporation Recyclability

Hydrogen production by steam reforming of acetic acid and bio-oil using Ni/γ-Al2O3 catalysts

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International Journal of Agricultural and Biological Engineering 2015年第6期8卷 69-76页

作者： li yanmei Fu Peng Yi Weiming Bai Xueyuan School of Agricultural and Food Engineering Shandong University of TechnologyZiboShandong 255049China Shandong Research Center of Engineering and Technology for Clean Energy ZiboShandong 255049China

Hydrogen production from steam reforming of bio-oil and acetic acid using Ni/γ-Al2O3 catalyst was studied in a laboratory-scale fixed bed *** study selected different Ni loadings(16.8%and 30.5%)in Ni/γ-Al2O3 catalysts and reaction temperatures(500°C,600°C and 700°C)as variables to optimize the hydrogen yield and selectivity of gases *** were carried out in an isothermal *** catalysts were prepared on wet impregnation of aγ-Al2O3 which supported with two different Ni *** principal gases generated were H2,CO,CO2 and *** results from steam reforming of acetic acid showed that the yield and selectivity of hydrogen using the catalyst with 30.5%Ni were significantly higher than that with 16.8%*** results showed that the most favorable temperature for hydrogen production was 600°C,and the steam reforming of bio-oil using Ni/γ-Al2O3 catalyst with 30.5%Ni showed that the yields and selectivity of H2 and CO2 increased with the temperature increasing while CH4 and CO selectivity *** results showed that the most favorable temperature for hydrogen production from bio-oil using 30.5%Ni/γ-Al2O3 was 600°C,at which hydrogen yield was at its maximum of 65%.

关键词： hydrogen bio-oil Ni/γ-Al2O3 catalyst steam reforming acetic acid

Sources and Flows of Embodied CO_2 Emissions in Import and Export Trade of China

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Chinese Geographical Science 2014年第2期24卷 220-230页

作者： li yanmei FU Jiafeng MA Zhanyun YANG Bo Institute of Recycling Economy Beijing University of Technology Chinese Research Academy of Environmental Sciences Beijing Academy of Social Sciences

This paper uses the Global Trade Analysis Project(version 7)database to calculate embodied CO2emissions in bilateral trade between China and other countries(regions)based on input-output *** sources and flows of embodied CO2emissions in import and export trade of China are *** show that the flows of embodied CO2emissions in export trade are highly *** main flows to the United States(US)and Japan account for 1/4 and 1/7 of the total CO2emissions in export trade,*** flows of total exports and small differences in export structure are the main reasons for the highly concentrated export *** sources of embodied CO2emissions in import trade have relatively low *** Province of China,Hong Kong Special Administrative Region of China,US,Russia,Republic of Korea,and Japan account for around 7.72%–12.67%of the total embodied CO2emissions in import *** relative dispersion of import sources,the impact of the import structure,and the level of production technology in importing countries caused low concentration of CO2emissions in import ***,the embodied CO2emissions in the export trade of China are higher than those in import *** a result,production-based CO2emissions are higher than consumption-based *** difference of 8.96×108t of CO2,which comes mainly from the US,Japan,Germany,and the United Kingdom,accounts for 58.70%of the total *** suggestions,such as improving energy efficiency,alerting high carbon-intensive industries transfer,expanding the market for sharing risks,and prompting the accounting system of consumption-based CO2emissions,are proposed based on the results.

关键词： export trade import trade embodied CO2 emissions input-output