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The density of surface ligands regulates the luminescence of thiolated gold nanoclusters and their metal ion response

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Chinese Chemical Letters 2021年第8期32卷 2390-2394页

作者： jie Xu Juanmin li Wencheng Zhong Mengyao Wen Gleb Sukhorukov li Shang State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene(NPU)Xi'an 710072China NPU-QMUL Joint Research Institute of Advanced Materials and Structures(JRI-AMAS) Northwestern Polytechnical UniversityXi'an 710072China Materials Research Institute School of Engineering and Materials ScienceQueen Mary University of LondonLondon E14NSUnited Kingdom

The fascinating luminescence properties of gold nanoclusters(AuNCs) have drawn considerable research interests,and been widely harnessed for a wide range of ***,a fundamental understanding towards ligand density’s role in the luminescence properties of these ultrasmall AuNCs remains unclear *** this communication,through systematic investigation of surface chemistries of glutathione-protected Au NCs(GSH-Au NCs) with diffe rent density of GSH as well as other thiolates,it is discovered that the density of surface ligands can significantly regulate the luminescence properties of *** lifetime spectroscopy and X-ray photoelectron spectroscopy showed that AuNCs with a higher density of electron-rich ligands facilitate their luminescence ***,differences in the surface coverage of AuNCs can also affect their interactions with foreign species,as illustrated by significantly different fluorescence quenching capability of GSH-AuNCs with different ligand density towards Hg^(2+).This study provides new insight into the intriguing luminescence properties of metal NCs,which is hoped to stimulate further research on the design of metal NCs with strong luminescence and sensitive/specific responses for promising optoelectronic,sensing and imaging applications.

关键词： Gold nanoclusters Luminescence enhancement ligand density Thermal treatment Metal ion

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Two new species of the genus Nassarius(Gastropoda:Nassariidae) from the South China Sea

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Acta Oceanologica Sinica 2021年第9期40卷 90-93页

作者： Suping zhang Shuqian zhang Haitao li Laboratory of Marine Organism Taxonomy and Phylogeny Institute of OceanologyChinese Academy of SciencesQingdao 266071China South China Sea Environmental Monitoring Center Ministry of Natural ResourcesGuangzhou 510300China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Two species of Nassarius Duméril, 1805 from the South China Sea are described and illustrated. The specimens are in the Nassariidae collection of the Marine Biological Museum of Chinese Academy of Sciences, *** concavus sp. nov., from the sandy bottom at a depth of 180 m, resembles Nassarius glabrus zhang and zhang, 2014 in general shell morphology, but differs from the latter in having a smaller, more slender adult shell without axial ribs on the upper teleoconch whorls. Nassarius nanshaensis sp. nov., from the Nansha Islands at a depth of 56–147 m, is similar to Nassarius maxiutongi zhang, zhang and li, 2019 in the shell sculpture, but differs in having a more slender shell with a higher spire, and fewer cusps on the rachidian tooth(9–11 vs. 13–17).

关键词： Gastropoda Nassarius new species South China Sea Nansha Islands

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Controllable Ring-opening Polymerization ofδ-Valerolactone Catalyzed by Quinolinyl-Urea/MTBD Systems

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Chinese Journal of Polymer Science 2024年第8期42卷 1103-1110页

作者： Xin-Yu liu liang Zhu Su-Yun jie Bo-Geng li State Key Laboratory of Chemical Engineering College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310058China

Due to their excellent biocompatibility and biodegradability,aliphatic polyesters are widely used in the biomedical,packaging and agricultural fields,which are usually accessed by the ring-opening polymerization(ROP)of lactones and the catalysts particularly play an important *** a series of quinolinyl-urea catalysts have been synthesized via the reaction between isocyanate and aminoquinoline with an amino group at different substitution positions and *** combination with 7-methyl-1,5,7-triazabicyclo[4,4,0]dec-5-ene(MTBD)as a cocatalyst and benzyl alcohol(BnOH)as an initiator,1-(3,5-bis(trifluoromethyl)phenyl)-3-(quinolin-3-yl)urea(3-QU)was observed to be most active for the ROP ofδ-valerolactone(δ-VL).The polymerization conditions were optimized by varying the type of organic base,catalyst concentration and reaction *** changing the ratio of[M]_0/[I],linear polyvalerolactones(PVLs)with different molecular weights and narrow molecular weight distribution were *** kinetic and chain extension experiments were carried out to prove the"living"/controllable *** the NMR experiments were used to support the proposal of possible mechanism.

关键词： Quinolinyl-urea Ring-opening polymerization PVL

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MYPT1 Sustains Centromeric Cohesion and the Spindle-Assembly Checkpoint

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Journal of Genetics and Genomics 2013年第11期40卷 575-578页

作者： Jing li Xiaoqian liu Ji liao jie Tian Jue Wang Xin Wang jiezhong zhang Xingzhi Xu Beijing Key Laboratory of DNA Damage Response College of Life SciencesCapital Normal University

During mitosis, cohesins hold the sister chromatids together until anaphase when arm cohesins are removed （Peters et al., 2008; Yao and Dai, 2012）. The shugoshin （Sgo） proteins play pivotal roles during this stage. There is only one shu- goshin in the fly and budding yeasts, while there are two in other organisms （including fission yeasts）. The two mamma- lian shugoshins, Sgol and Sgo2, carry out distinct functions： Sgol mainly in mitosis, and Sgo2 mainly in meiosis and perturbed mitosis. Mitotic cyclin-dependent kinase 1 （CDKI） phosphorylates Sgol, and targets the Sgol-protein phospha- tase 2A （PP2A） complex to protect centromeric cohesin （Kitajima et al., 2006; Tang et al., 2006; liu et al., 2012）,

关键词： MYPT1 Sustains Centromeric Cohesion and the Spindle-Assembly Checkpoint RNAi PP

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Two new diterpene and sesquiterpene from Pteris dispar

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Chinese Chemical Letters 2011年第12期22卷 1451-1453页

作者： Zhan Ping Gou Nian Ci liang jie Hou li li Yan Tian Chang Yuan Wang Xun Cui Bao Jing zhang Xiao Chi Ma Guangdong Key Laboratory of Research and Development of Natural Drugs Guangdong Medical CollegeZhanjiang 524023China School of Pharmacy Dalian Medical UniversityDalian 116044China Department of Oriental Pharmacy Woosuk UniversityWanju-gunJeonbuk 565-701Republic of Korea

A new diterpene and a new sesquiterpene were isolated from Pteris dispar and identified on the basis of spectral data including 2D *** 1 and 2 showed potent cytotoxic activity against KB cell.

关键词： Pteris dispar ent-Kaurane Sesquiterpenoid

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Temperature-regulated typeⅡgrass carp reovirus establishes latent infection in Ctenopharyngodon idella brain

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Virologica Sinica 2023年第3期38卷 440-447页

作者： Rui Jiang jie zhang Zhiwei liao Wentao Zhu Hang Su Yongan zhang Jianguo Su College of Fisheries Hubei Hongshan LaboratoryHuazhong Agricultural UniversityWuhan430070China Laboratory for Marine Biology and Biotechnology Pilot National Laboratory for Marine Science and TechnologyQingdao266237China

Grass carp reovirus(GCRV)causes extensive infection and death in grass carp and black carp fingerlings,with a highly seasonal *** studies suggested that GCRV can become latent after primary *** this study,we investigated type II GCRV(GCRV-II)latency in asymptomatic grass carp with GCRV infection or exposure *** found that during latent infection,GCRV-II was detectable only in the brain of grass carp,unlike the multi-tissue distribution observed in natural ***-II only caused damage to the brain during latent infection,while in natural infection,brain,heart,and eye tissues had relatively higher viral *** also discovered viral inclusion bodies in infected fish ***,GCRV-II distribution in grass carp was notably affected by ambient temperature,with the virus targeting the brain only during low temperatures and multi-tissue distribution during high *** study provides insights into the mechanisms of GCRV-II latent infection and reactivation and contributes to the prevention and control of GCRV pandemics.

关键词： Grass carp Grass carp reovirus(GCRV) Latent infection Brain

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Interfacial phase formation of Al-Cu bimetal by solid-liquid casting method

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China Foundry 2017年第3期14卷 194-198页

作者： Ying Fu Yu-bo zhang Jin-chuan jie Kateryna Svynarenko Chang-hai liang Ting-ju li School of Materials Science and Engineering Dalian University of Technology Dalian 116024 Liaoning China Research Institute of Mechatronics & Automation Bohai University Jinzhou 121003 Liaoning China School of Chemical Engineering Dalian University of Technology Dalian 116024 Liaoning China

The solid-liquid method was used to prepare the continuous casting of copper cladding aluminium by liquid aluminum alloy and solid copper, and the interfacial phase formation of Al-Cu bimetal at different pouring temperatures(700, 750, 800 oC) was investigated by means of metallograph, scanning electron microscopy(SEM) and energy dispersive spectrometry(EDS) methods. The results showed that the pouring temperature of aluminum melt had an important influence on the element diffusion of Cu from the solid Cu to Al alloy melt and the reactions between Al and Cu, as well as the morphology of the Al-Cu interface. When the pouring temperature was 800 oC, there were abundant Al-Cu intermetallic compounds(IMCs) near the interface. However, a lower pouring temperature(700 oC) resulted in the formation of cavities which was detrimental to the bonding and mechanical properties. Under the conditions in this study, the good metallurgical bonding of Al-Cu was achieved at a pouring temperature of 750 oC.

关键词： Al-Cu clad materials interface solid-liquid method microstructure

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The X-ray diffraction study of epitaxial La_(0.67)Sr_(0.33)MnO_(3）single crystal thin film

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Chinese Science Bulletin 1997年第22期42卷 1932-1936页

作者： GAO jie XIONG Caoshui TANG Yeqing ZHU Hong PI li ZHU Jingsheng ZHOU Guien zhang Yuheng Structure Research Laboratory University of Science and Technologly of ChinaHefei 230026China Department of Physics Xinjiang UniversityUrumqi 830046China

THE colossal magnetoresistance (CMR) effects in doped perovskite-like oxide have stimulatedconsiderable attention to the study of fundamental physics and the application of new type ma-terials. It was reported that a ... 详细信息

关键词： colossal magnetoresistance La_(0.67)Sr_(0.33)MnO_(3) epitaxial thin film pole figure lattice match

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Improving tribological and corrosion resistance of Ti6Al4V alloy by hybrid microarc oxidation/enameling treatments

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Rare Metals 2018年第1期37卷 26-34页

作者： jie Jin Xiao-Han li Ji-Wen Wu Bai-Yang Lou College of Material Science and Engineering Zhejiang University of Technology

A promising duplex coating was prepared by microarc oxidation（MAO） and enameling processes onto polished Ti6A14V alloy. The TiO2 ceramic coating deposited by MAO was characterized and then combined with an enameling treatment in order to improve the tribological and corrosion resistance of Ti6A14V alloy. The morphology, phase composition, and hardness of MAO and MAO/enameling-coated Ti6A14V alloy were evaluated by scanning electron microscopy（SEM）, X-ray diffraction（XRD）, and Vickers microhardness tester, *** tribological performance was investigated using a ballon-disk tribometer. The corrosion resistance was studied using immersion tests and potentiodynamic *** tests show that the enamel coating on the MAOcoated surface causes a reduction in the friction *** tests demonstrate that the duplex coating is more effective in improving the corrosion resistance of Ti6A14V than the MAO coating especially at high temperature（80 ℃）. Potentiodynamic polarization curves reveal that the corrosion potential of the duplex coating increases by about 250 mV and the corrosion current density is slightly lower than that of the MAO coating. The duplex coating is superior to the stand-alone MAO coating in improving the tribological and corrosion behavior of Ti6A14V.

关键词： Ti6Al4V Microarc oxidation Enameling Tribological Corrosion

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Shallow water bathymetry based on a back propagation neural network and ensemble learning using multispectral satellite imagery

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Acta Oceanologica Sinica 2023年第5期42卷 154-165页

作者： Sensen Chu liang Cheng Jian Cheng Xuedong zhang jie zhang Jiabing Chen Jinming liu Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology Nanjing UniversityNanjing 210023China Collaborative Innovation Center of South China Sea Studies Nanjing UniversityNanjing 210093China School of Geography and Ocean Science Nanjing UniversityNanjing 210023China Jiangsu Center for Collaborative Innovation in Novel Software Technology and Industrialization Nanjing 210023China Zhejiang Institute of Hydraulics and Estuary Hangzhou 310020China Institute of Defense Engineering Academy of Military SciencesBeijing 100036China

The back propagation(BP)neural network method is widely used in bathymetry based on multispectral satellite ***,the classical BP neural network method faces a potential problem because it easily falls into a local minimum,leading to model training *** study confirmed that the local minimum problem of the BP neural network method exists in the bathymetry field and cannot be ***,to solve the local minimum problem of the BP neural network method,a bathymetry method based on a BP neural network and ensemble learning(BPEL)is ***,the remote sensing imagery and training sample were used as input datasets,and the BP method was used as the base learner to produce multiple water depth inversion ***,a new ensemble strategy,namely the minimum outlying degree method,was proposed and used to integrate the water depth inversion ***,an ensemble bathymetric map was *** Reef,northeastern Jiuzhang Atoll,and Pingtan coastal zone were selected as test cases to validate the proposed *** with the BP neural network method,the root-mean-square error and the average relative error of the BPEL method can reduce by 0.65–2.84 m and 16%–46%in the three test cases at *** results showed that the proposed BPEL method could solve the local minimum problem of the BP neural network method and obtain highly robust and accurate bathymetric maps.

关键词： bathymetry back propagation neural network ensemble learning local minimum problem multispectral satellite imagery

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