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磁性核壳胶囊局域中和胃酸用于活性益生菌的高效递送
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作者 李芷阳 邓晖 +1 位作者 蔡芯琪 陈卓 《物理化学学报》 SCIE CAS CSCD 北大核心 2024年第7期61-68,共8页
近年来基于益生菌的幽门螺旋杆菌感染治疗策略受到了越来越多的关注,然而益生菌在胃部中直接递送会受到胃酸环境的干扰,难以存活,无法有效抑制幽门螺旋杆菌。为了实现益生菌在胃部的高效递送,我们制备了具有核壳结构的益生菌胶囊。胶囊... 近年来基于益生菌的幽门螺旋杆菌感染治疗策略受到了越来越多的关注,然而益生菌在胃部中直接递送会受到胃酸环境的干扰,难以存活,无法有效抑制幽门螺旋杆菌。为了实现益生菌在胃部的高效递送,我们制备了具有核壳结构的益生菌胶囊。胶囊外壳由海藻酸钙(Alg)、碳酸钙(CaCO_(3))以及铁钴磁性石墨纳米囊FeCo@G组成,胶囊内核为益生菌(约氏乳杆菌,Laj)菌液。其中,CaCO_(3)用于局域中和胃酸以保护内核益生菌,而FeCo@G则赋予了胶囊良好的磁驱动性能。我们利用扫描电子显微镜以及细胞显微成像系统等手段考察了益生菌胶囊的形貌和包裹稳定性,结果显示,胶囊能稳定包裹益生菌并抵御模拟胃液(SGF)中盐酸的侵蚀,维持了益生菌活性,并对幽门螺旋杆菌(H.p)具有明显抑制作用。此外,我们进一步探究了Alg/CaCO_(3)/FeCo@G-Laj(ACFL)胶囊在模拟胃部环境内的磁导航运动性能,结果表明,在磁场条件下,ACFL胶囊在不同粘度的介质中均可以实现高效的磁驱动效应,证实了ACFL胶囊的益生菌靶向递送能力。综上,ACFL胶囊为幽门螺旋杆菌的治疗提供新的方法,同时也为胃酸不稳定药物的高效保护以及精准投递提供了新平台。 展开更多
关键词 益生菌 幽门螺旋杆菌 胃部药物投递 磁性石墨纳米囊 酸稳定性
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Tuning interfacial charge transfer for efficient visible-light-driven photodegradation and simultaneous H_(2)evolution 被引量:2
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作者 zhiyang li Yaogang Chen +7 位作者 Yinghe Zhang Wei Ai Qian Lei Tingjun Yao Dan Zhong Wenjie liu Wenbiao Jin Lei Yang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2024年第1期35-49,共15页
The edge-graphitized carbon nitride(C_(3)N_(4)-C g)was prepared by secondary pyrolysis to construct ZnO/C_(3)N_(4)-C g(ZCN)type-Ⅱheterojunction photocatalyst via a facile sonication dispersion method,which achieved∼... The edge-graphitized carbon nitride(C_(3)N_(4)-C g)was prepared by secondary pyrolysis to construct ZnO/C_(3)N_(4)-C g(ZCN)type-Ⅱheterojunction photocatalyst via a facile sonication dispersion method,which achieved∼7.04-fold and∼18.3-fold enhanced visible-light-driven photocatalytic performance for refrac-tory micropollutant removal and simultaneous hydrogen(H_(2))evolution respectively compared to con-ventional ZnO/g-C_(3)N_(4)Step-scheme heterojunction.The apparent quantum efficiency of the ZCN_(0.4)het-erojunction reaches 0.92%(λ=420 nm).Such excellent performance stems from that the edge-graphene moieties stitched onto the interface of heterojunction extend light absorption to the full visible spec-trum,meanwhile,the built-in electric field generated during Fermi level alignment accompanying fa-vorable band-bending structure provides an effective pathway for the rapid migration of photoinduced electrons via the edge graphene channel to improve interfacial charge separation efficiency.Interestingly,the midgap states introduced in ZCN heterojunction could temporarily retain photoexcited electrons to effectively inhibit the in situ carrier recombination for improved photocatalytic H_(2)evolution.Moreover,ZCN/peroxymonosulfate system exhibited excellent anti-interference performance against complex water bodies under visible illumination due to the synergistic effect between the co-existing anions and organic matter.Meanwhile,the eco-friendly nature of the ZCN/peroxymonosulfate system showed no biotoxicity of reaction filtrate on cell proliferation after treatment,which avoided secondary contamination.Consid-ering the outstanding performance in photocatalysis,the ZCN system exhibits broad potential for practical applications in water pollution control and green energy production. 展开更多
关键词 ZnO C_(3)N_(4)-C g HETEROJUNCTION PHOTODEGRADATION Hydrogen evolution
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Consensus statement on research and application of Chinese herbal medicine derived extracellular vesicles-like particles(2023 edition) 被引量:1
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作者 Qing Zhao Tong Wang +23 位作者 Hongbin Wang Peng Cao Chengyu Jiang Hongzhi Qiao lihua Peng Xingdong lin Yunyao Jiang Honglei Jin Huantian Zhang Shengpeng Wang Yang Wang Ying Wang Xi Chen Junbing Fan Bo li Geng li Bifeng liu zhiyang li Suhua Qi Mingzhen Zhang Jianjian Zheng Jiuyao Zhou Lei Zheng Kewei Zhao 《Chinese Herbal Medicines》 CAS 2024年第1期3-12,共10页
To promote the development of extracellular vesicles of herbal medicine especially the establishment of standardization,led by the National Expert Committee on Research and Application of Chinese Herbal Vesicles,resea... To promote the development of extracellular vesicles of herbal medicine especially the establishment of standardization,led by the National Expert Committee on Research and Application of Chinese Herbal Vesicles,research experts in the field of herbal medicine and extracellular vesicles were invited nationwide with the support of the Expert Committee on Research and Application of Chinese Herbal Vesicles,Professional Committee on Extracellular Vesicle Research and Application,Chinese Society of Research Hospitals and the Guangdong Engineering Research Center of Chinese Herbal Vesicles.Based on the collation of relevant literature,we have adopted the Delphi method,the consensus meeting method combined with the nominal group method to form a discussion draft of“Consensus statement on research and application of Chinese herbal medicine derived extracellular vesicles-like particles(2023)”.The first draft was discussed in online and offline meetings on October 12,14,November 2,2022 and April and May 2023 on the current status of research,nomenclature,isolation methods,quality standards and research applications of extracellular vesicles of Chinese herbal medicines,and 13 consensus opinions were finally formed.At the Third Academic Conference on Research and Application of Chinese Herbal Vesicles,held on May 26,2023,Kewei Zhao,convenor of the consensus,presented and read the consensus to the experts of the Expert Committee on Research and Application of Chinese Herbal Vesicles.The consensus highlights the characteristics and advantages of Chinese medicine,inherits the essence,and keeps the righteousness and innovation,aiming to provide a reference for colleagues engaged in research and application of Chinese herbal vesicles at home and abroad,decode the mystery behind Chinese herbal vesicles together,establish a safe,effective and controllable accurate Chinese herbal vesicle prevention and treatment system,and build a bridge for Chinese medicine to the world. 展开更多
关键词 Chinese herbal medicine extracellular vesicles research application CONSENSUS
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Non-covalent interaction of atomically dispersed dual-site catalysts featuring Co and Ni nascent pair sites for efficient electrocatalytic overall water splitting
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作者 Imran Khan Yaogang Chen +8 位作者 zhiyang li Wenjie liu Salman Khan Sami Ullah linlin liu Amir Zada Sharafat Ali Shabana Shaheen Lei Yang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2024年第11期210-225,共16页
The scarcity of highly effective and economical catalysts is a major impediment to the widespread adop-tion of electrochemical water splitting for the generation of hydrogen.MoS_(2),a low-cost candidate,suffers from i... The scarcity of highly effective and economical catalysts is a major impediment to the widespread adop-tion of electrochemical water splitting for the generation of hydrogen.MoS_(2),a low-cost candidate,suffers from inefficient catalytic activity.Nonetheless,a captivating strategy has emerged,which involves the en-gineering of heteroatom doping to enhance electrochemical proficiency.This investigation demonstrates a successful implementation of the strategy by combining ultrathin MoS_(2) nanosheets with Co and Ni dual single multi-atoms(DSMAs)grown directly on 2D N-doped carbon nanosheets(CoNi-MoS_(2)/NCNs)for the purpose of improving hydrogen evolution reaction(HER)and oxygen evolution reaction(OER).With the aid of a dual-atom doped bifunctional electrocatalyst,effective water splitting has been achieved across a broad pH range in electrolytes.The double doping of Co and Ni strengthens their interactions,thereby altering the electromagnetic composition of the host MoS_(2) and ultimately leading to improved electrocat-alytic activity.Additionally,the synergistic effect between NCNs and MoS_(2) nanosheets provided efficient electron transport channels for ions and an ample surface area with open voids for ion diffusion.Con-sequently,the CoNi-MoS_(2)/NCNs catalysts demonstrated exceptional stability and activity,producing low degree overpotentials of 180.5,124.9,and 196.4 mV for HER and 200,203,and 207 mV for OER in neu-tral,alkaline,and acidic mediums,respectively,while also exhibiting outstanding overall water-splitting performance,durability,and stability when used as an electrolyzer at universal pH. 展开更多
关键词 Multifunctional catalyst Water splitting Functionalized carbon nanosheets Interface engineering pH-universal electrocatalysis
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Local TSH/TSHR signaling promotes CD8^(+) T cell exhaustion and immune evasion in colorectal carcinoma
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作者 Sisi Zeng Huiling Hu +19 位作者 zhiyang li Qi Hu Rong Shen Mingzhou li Yunshi liang Zuokang Mao Yandong Zhang Wanqi Zhan Qin Zhu Feifei Wang Jianbiao Xiao Bohan Xu Guanglong liu Yanan Wang Bingsong li Shaowan Xu Zhaowen Zhang Ceng Zhang Zhizhang Wang li liang 《Cancer Communications》 SCIE 2024年第11期1287-1310,共24页
Dysfunction of CD8^(+)T cells in the tumor microenvironment(TME)contributes to tumor immune escape and immunotherapy tolerance.The effects of hormones such as leptin,steroid hormones,and glucocorticoids on T cell func... Dysfunction of CD8^(+)T cells in the tumor microenvironment(TME)contributes to tumor immune escape and immunotherapy tolerance.The effects of hormones such as leptin,steroid hormones,and glucocorticoids on T cell function have been reported previously.However,the mechanism underlying thyroid-stimulating hormone(TSH)/thyroid-stimulating hormone receptor(TSHR)signaling in CD8^(+)T cell exhaustion and tumor immune evasion remain poorly understood.This study was aimed at investigating the effects of TSH/TSHR signaling on the function of CD8^(+)T cells and immune evasion in colorectal cancer(CRC).Methods:TSHR expression levels in CD8^(+)T cells were assessed with immunofluorescence and flow cytometry.Functional investigations involved manipulation of TSHR expression in cellular and mouse models to study its role in CD8^(+)T cells.Mechanistic insights were mainly gained through RNAsequencing,Western blotting,chromatin immunoprecipitation and luciferase activity assay.Immunofluorescence,flow cytometry and Western blotting were used to investigate the source of TSH and TSHR in CRC tissues.Results:TSHR was highly expressed in cancer cells and CD8^(+)T cells in CRC tissues.TSH/TSHR signaling was identified as the intrinsic pathway promoting CD8^(+)T cell exhaustion.Conditional deletion of TSHR in CD8^(+)tumorinfiltrating lymphocytes(TILs)improved effector differentiation and suppressed the expression of immune checkpoint receptors such as programmed cell death 1(PD-1)and hepatitis A virus cellular receptor 2(HAVCR2 or TIM3)through the protein kinase A(PKA)/cAMP-response element binding protein(CREB)signaling pathway.CRC cells secreted TSHR via exosomes to increase the TSHR level in CD8^(+)T cells,resulting in immunosuppression in the TME.Myeloid-derived suppressor cells(MDSCs)was the main source of TSH within the TME.Low expression of TSHR in CRC was a predictor of immunotherapy response.Conclusions:The present findings highlighted the role of endogenous TSH/TSHR signaling in CD8^(+)T cell exhaustion and immune evasion in CRC.TSHR may be suitable as a predictive and therapeutic biomarker in CRC immunotherapy. 展开更多
关键词 Thyroid stimulating hormone Thyroid stimulating hormone receptor Colorectal carcinoma T cell exhaustion Immune evasion
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Unconventional Petroleum Sedimentology:A Key to Understanding Unconventional Hydrocarbon Accumulation 被引量:2
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作者 Caineng Zou Zhen Qiu +17 位作者 Jiaqiang Zhang zhiyang li Hengye Wei Bei liu Jianhua Zhao Tian Yang Shifa Zhu Huifei Tao Fengyuan Zhang Yuman Wang Qin Zhang Wen liu Hanlin liu Ziqing Feng Dan liu Jinliang Gao Rong liu Yifan li 《Engineering》 SCIE EI CAS 2022年第11期62-78,共17页
The commercial exploitation of unconventional petroleum resources(e.g.,shale oil/gas and tight oil/gas)has drastically changed the global energy structure within the past two decades.Sweet-spot intervals(areas),the mo... The commercial exploitation of unconventional petroleum resources(e.g.,shale oil/gas and tight oil/gas)has drastically changed the global energy structure within the past two decades.Sweet-spot intervals(areas),the most prolific unconventional hydrocarbon resources,generally consist of extraordinarily high organic matter(EHOM)deposits or closely associated sandstones/carbonate rocks.The formation of sweet-spot intervals(areas)is fundamentally controlled by their depositional and subsequent diagenetic settings,which result from the coupled sedimentation of global or regional geological events,such as tectonic activity,sea level(lake level)fluctuations,climate change,bottom water anoxia,volcanic activity,biotic mass extinction or radiation,and gravity flows during a certain geological period.Black shales with EHOM content and their associated high-quality reservoir rocks deposited by the coupling of major geological events provide not only a prerequisite for massive hydrocarbon generation but also abundant hydrocarbon storage space.The Ordovician-Silurian Wufeng-Longmaxi shale of the Sichuan Basin,Devonian Marcellus shale of the Appalachian Basin,Devonian-Carboniferous Bakken Formation of the Williston Basin,and Triassic Yanchang Formation of the Ordos Basin are four typical unconventional hydrocarbon systems selected as case studies herein.In each case,the formation of sweet-spot intervals for unconventional hydrocarbon resources was controlled by the coupled sedimentation of different global or regional geological events,collectively resulting in a favorable environment for the production,preservation,and accumulation of organic matter,as well as for the generation,migration,accumulation,and exploitation of hydrocarbons.Unconventional petroleum sedimentology,which focuses on coupled sedimentation during dramatic environmental changes driven by major geological events,is key to improve the understanding of the formation and distribution of sweet-spot intervals(areas)in unconventional petroleum systems. 展开更多
关键词 SEDIMENTOLOGY Black shales Fine-grained sediments Organic matter accumulation Extraordinarily high organic matter Unconventional petroleum
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On the Cooperation of Jiangmen City with Guangzhou Experimental Station,CATAS in Agricultural Development
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作者 Yongqing ZHENG zhiyang li +1 位作者 Qiongyan li Shouxing WEI 《Asian Agricultural Research》 2013年第11期49-52,共4页
Guangdong Province is one of the provinces in China with the best modern agricultural industry and the highest production efficiency.While Jiangmen City,one of the agriculture-based cities in Guangdong Province,has ma... Guangdong Province is one of the provinces in China with the best modern agricultural industry and the highest production efficiency.While Jiangmen City,one of the agriculture-based cities in Guangdong Province,has made active exploration in building a modern agricultural system.China has established cooperation with the four largest agricultural research institutes in China to offer technical support for the development of modern agriculture.In this paper,the status quo and existing problems of agricultural development in Jiangmen,Guangdong are briefly introduced.Then,the cooperation status and prospect of local government with the research institutes are discussed.Finally some suggestions are given on the agricultural development pattern in Jiangmen City. 展开更多
关键词 Jiangmen STATUS quo of AGRICULTURAL INDUSTRY Scien
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Research progress of severe acute respiratory syndrome coronavirus 2 on aerosol collection and detection
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作者 Xinyu Zhang Yuting Chen +9 位作者 Yueying Pan Xinye Ma Gui Hu Song li Yan Deng Zhu Chen Hui Chen Yanqi Wu Zhihong Jiang zhiyang li 《Chinese Chemical Letters》 SCIE CAS CSCD 2024年第1期108-115,共8页
The outbreak of severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)in late 2019 has negatively affected people's lives and productivity.Because the mode of transmission of SARS-CoV-2 is of great concern,th... The outbreak of severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)in late 2019 has negatively affected people's lives and productivity.Because the mode of transmission of SARS-CoV-2 is of great concern,this review discusses the sources of virus aerosols and possible transmission routes.First,we discuss virus aerosol collection methods,including natural sedimentation,solid impact,liquid impact,centrifugal,cyclone and electrostatic adsorption methods.Then,we review common virus aerosol detection methods,including virus culture,metabolic detection,nucleic acid-based detection and immunology-based detection methods.Finally,possible solutions for the detection of SARS-CoV-2 aerosols are introduced.Point-of-care testing has long been a focus of attention.In the near future,the development of an instrument that integrates sampling and output results will enable the real-time,automatic monitoring of patients. 展开更多
关键词 Virus aerosol Aerosol transmission Aerosol collection Aerosol detection Protective measure
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Ultrastable graphene isolated Au Ag nanoalloy for SERS biosensing and photothermal therapy of bacterial infection
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作者 Shengkai li zhiyang li +6 位作者 Qing Hao Shen Wang Yanxia Yang Jieqiong Xu Zhiwei Yin liang Zhang Zhuo Chen 《Chinese Chemical Letters》 SCIE CAS CSCD 2024年第3期198-203,共6页
Plasmonic metal nanomaterials with intrinsic surface–enhanced Raman scattering(SERS)and photothermal properties,especially AuAg nanoalloys with both the outstanding merits of Au and Ag nanocrystals,show huge applicat... Plasmonic metal nanomaterials with intrinsic surface–enhanced Raman scattering(SERS)and photothermal properties,especially AuAg nanoalloys with both the outstanding merits of Au and Ag nanocrystals,show huge application prospects in bacterial theranostics.However,the direct exposure of AuAg nanoalloys in external conditions probably cause undesirable reactions and poisonous metal ion leakage during SERS detection and photothermal antibacterial therapy process,which severely hinder bacterial theranostics applications.Herein,we report an ultrastable graphene–isolated AuAg nanoalloy(GAA)with AuAg core confined in few–layer graphitic shell as a versatile platform for bacterial detection and therapy.The encapsulation of graphene ensures the good stability of AuAg core,that its superior SERS and photothermal properties are therefore further guaranteed.GAA is used for SERS detection of two vital bacterial biomarkers(including corrosive cyanide and pyocyanin),exhibiting good SERS quantitative and multiplexing ability.GAA is further used for photothermal antibacterial therapy application,and ultrahigh antibacterial efficacies for both Gram–negative Escherichia coli and Gram–positive Staphylococcus aureus are achieved under 808 nm laser irradiation.This work proposes a valuable method to develop robust bacterial theranostic platform. 展开更多
关键词 Localized surface plasmon resonance Graphitic shell isolated AuAg nanoalloy(GAA) Surface–enhanced Raman scattering(SERS) Bacterial biomarker detection Photothermal antibacterial therapy
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Rh(Ⅱ)catalyzed efficient sigmatropic rearrangement reaction of pyridotriazoles and sulfides
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作者 Yuting Chen Guanghui Lv +4 位作者 zhiyang li Meiling Ye Tianle Huang li Hai Yong Wu 《Green Synthesis and Catalysis》 2024年第2期77-79,共3页
The[2,3]-and[1,2]-sigmatropic rearrangement reactions between pyridotriazoles and sulfides catalyzed by rhodium(II)were investigated.The utilization of pyridotriazoles as the carbene precursors in this kind of reactio... The[2,3]-and[1,2]-sigmatropic rearrangement reactions between pyridotriazoles and sulfides catalyzed by rhodium(II)were investigated.The utilization of pyridotriazoles as the carbene precursors in this kind of reaction efficiently constructed the C(sp3)-S and C(sp3)-Se bond with broad substrate scope and great functional group tolerance. 展开更多
关键词 Pyridotriazole SULFIDE [2 3]-Sigmatropic rearrangement [1 2]-Sigmatropic rearrangement Rhodium catalysis
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Simultaneous extraction of DNA and RNA from Escherichia coli BL 21 based on silica-coated magnetic nanoparticles 被引量:7
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作者 Jiuhai Wang Zeeshan Ali +8 位作者 Nianyue Wang Wenbiao liang Hongna liu Fu li Haowen Yang Lei He libo Nie Nongyue He zhiyang li 《Science China Chemistry》 SCIE EI CAS CSCD 2015年第11期1774-1778,共5页
The extraction of nucleic acid is recognized as one of the most essential steps in molecular biology for initiating other downstream applications such as sequencing, amplification, hybridization, and cloning. Many com... The extraction of nucleic acid is recognized as one of the most essential steps in molecular biology for initiating other downstream applications such as sequencing, amplification, hybridization, and cloning. Many commercial kits and methods are currently available that allow the extraction of only one type of nucleic acids-DNA or RNA. However, in parallel clinical detection of several diseases, a method for simultaneous extraction of both DNA and RNA from the same source is needed in such cases. In this study, a method for simultaneous extraction of DNA and RNA from bacteria based on magnetic nanoparticles(MNPs) was described. Lysis buffers were prepared to help the nucleic acid released and adsorbed to MNPs. Then, two washing buffers were used to remove the contamination of proteins and carbohydrates. The nucleic acids were finally eluted by Deoxyribonuclease(DNase) and Ribonucleases(RNase) free water. Different factors which might affect the purification of the nucleic acid were investigated, and the quantity and quality parameters of the nucleic acid were also recorded. The DNA and RNA extracted from bacteria were then respectively subjected to polymerase chain reaction(PCR) and reverse transcription PCR(RT-PCR) to further confirm its quality. The results indicated that our method can be successfully used to simultaneously extract DNA and RNA from bacteria. 展开更多
关键词 nucleic acids simultaneous extraction magnetic nanoparticles (MNPs) BACTERIA
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Current signal amplification strategies in aptamer-based electrochemical biosensor:A review 被引量:3
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作者 Lei He Rongrong Huang +8 位作者 Pengfeng Xiao Yuan liu lian Jin Hongna liu Song li Yan Deng Zhu Chen zhiyang li Nongyue He 《Chinese Chemical Letters》 SCIE CAS CSCD 2021年第5期1593-1602,共10页
Due to their high specificity and affinity towards various targets,along with other unique advantages such as stability and low cost,aptamers are widely applied in analytical techniques.A typical aptamerbased electroc... Due to their high specificity and affinity towards various targets,along with other unique advantages such as stability and low cost,aptamers are widely applied in analytical techniques.A typical aptamerbased electrochemical biosensor is composed of a aptamer as the biological recognition element and transducer converting the biologic interaction into electrical signals for the quantitative measurement of targets.Improvement of the sensitivity of a biosensor is significantly important in order to achieve the detection of biomolecules with low abundance,and different amplification strategies have been explored.The strategies either employ nanomaterials such as gold nanoparticles to con struct electrodes which can transfer the biological reactions more efficiently,or attempt to obtain enhanced signal through multi-labeled carriers or utilize enzyme mimics to catalyze redox cycling.This review discusses recent advances in signal amplification methods and their applications.Critical assessment of each method is also considered. 展开更多
关键词 ELECTROCHEMICAL APTASENSOR Signal amplification NANOMATERIALS DNA nanotechnology
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Rapid and label-free classification of pathogens based on light scattering,reduced power spectral features and support vector machine 被引量:1
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作者 Mubashir Hussain Zhen Chen +8 位作者 Mu Lv Jingyi Xu Xiaohan Dong Jingzhou Zhao Song li Yan Deng Nongyue He zhiyang li Bin liu 《Chinese Chemical Letters》 SCIE CAS CSCD 2020年第12期3163-3167,共5页
The rapid identification of pathogens is crucial in controlling the food quality and safety.The proposed system for the rapid and label-free identification of pathogens is based on the principle of laser scattering fr... The rapid identification of pathogens is crucial in controlling the food quality and safety.The proposed system for the rapid and label-free identification of pathogens is based on the principle of laser scattering from the bacterial microbes.The clinical prototype consists of three parts:the laser beam,photodetectors,and the data acquisition system.The bacterial testing sample was mixed with 10 mL distilled water and placed inside the machine chamber.When the bacterial microbes pass by the laser beam,the scattering of light occurs due to variation in size,shape,and morphology.Due to this reason,different types of pathogens show their unique light scattering patterns.The photo-detectors were arranged at the surroundings of the sample at different angles to collect the scattered light.The photodetectors convert the scattered light intensity into a voltage waveform.The waveform features were acquired by using the power spectral characteristics,and the dimensionality of extracted features was reduced by applying minimal-redundancy-maximal-relevance criterion(mRMR).A support vector machine(SVM)classifier was developed by training the selected power spectral features for the classification of three different bacterial microbes.The resulting average identification accuracies of E.faecalis,E.coli and S.aureus were 99%,87%,and 94%,respectively.The ove rall experimental results yield a higher accuracy of 93.6%,indicating that the proposed device has the potential for label-free identification of pathogens with simplicity,rapidity,and cost-effectiveness. 展开更多
关键词 Pathogens identification Laser light scattering Features reduction Support vector machines Waveform features extraction
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Spermine increases bactericidal activity of silver-nanoparticles against clinical methicillin-resistant Staphylococcus aureus 被引量:1
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作者 Chang liu Han Shen +9 位作者 Su Wang Xiaoli Cao Hongpan Xu Yanyan Xia Tingting Bai Yufeng liu lijun Peng Chuchu li Zhirui Guo zhiyang li 《Chinese Chemical Letters》 SCIE CAS CSCD 2018年第12期1824-1828,共5页
Methicillin-resistant Staphylococcus aureus(MRSA) has emerged worldwide as a major multidrugresistant pathogen that causes notable morbidity and mortality. Fast emerging of MRSA prevalence requires special attention f... Methicillin-resistant Staphylococcus aureus(MRSA) has emerged worldwide as a major multidrugresistant pathogen that causes notable morbidity and mortality. Fast emerging of MRSA prevalence requires special attention for strengthening the inventory of antimicrobial compounds. Silver nanoparticles(AgNPs) have been widely used to treat multi-drug resistant pathogens due to the unique antibacterial properties, meanwhile spermine has been proven to exert outstanding inhibition effect to S.aureus with not yet fully understood mechanisms. The aim of this study was to investigate the synergistic effect of AgNPs and spermine as well as to determine the antibacterial activity of their combination against MRSA strains. Several clinical MRSA isolates and ATCC BAA-1026 were used to determine minimum inhibitory concentration(MIC) and fractional inhibitory concentration indices(FICI) of AgNPs and spermine, and a synergistic effect was observed. This phenomenon was further confirmed by growth curve and time-killing assays, showed that spermine could be used as an adjuvant for AgNPs in the treatment of MRSA infections. 展开更多
关键词 SPERMINE Silver nanoparticles Staphylococcus aureus Synagistic effect ANTIMICROBIAL
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S-doped graphene quantum dots as nanophotocatalyst for visible light degradation
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作者 Biting Huang Jingbo He +5 位作者 Shiyue Bian Chenjuan Zhou zhiyang li Fengna Xi Jiyang liu Xiaoping Dong 《Chinese Chemical Letters》 SCIE CAS CSCD 2018年第11期1698-1701,共4页
Graphene quantum dots (GODs) recently emerge as the new and appealing nanophotocatalyst because of their low-cost, environmental compatibility and the ability to facilitate the charge migration and prolong the charg... Graphene quantum dots (GODs) recently emerge as the new and appealing nanophotocatalyst because of their low-cost, environmental compatibility and the ability to facilitate the charge migration and prolong the charge lifetimes. In this work, a visible photocatalyst of S-doped graphene quantum dots (S-GQDs) was prepared by a facile hydrothermal synthesis using 1,3,6-trinitropyrene and Na2S as precursors. The well crystallization and monodispersity as well as the chemical environment of S-GQDs were characterized by transmission electron microscopy, atom force microscopy and X-ray photoelectron spectrum. A superior photocatalytic performance of S-GQDs was demonstrated for degradation of basic fuchsin under visible light irradiation. Furthermore, the possible photocatalytic mechanism was proposed based on the trapping experiments of active species. 展开更多
关键词 Graphene quantum dots S-doped Nanophotocatalyst Visible light degradation Basic fuchsin
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Recent advancements in DNA nanotechnology-enabled extracellular vesicles detection and diagnosis:A mini review
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作者 Rongrong Huang Lei He +3 位作者 lian Jin zhiyang li Nongyue He Wenjun Miao 《Chinese Chemical Letters》 SCIE CAS CSCD 2023年第6期101-110,共10页
Extracellular vesicles(EVs)are cell-derived nanosized vesicles widely recognized for their critical roles in various pathophysiological processes.Molecular analysis of EVs is currently being considered an emerging too... Extracellular vesicles(EVs)are cell-derived nanosized vesicles widely recognized for their critical roles in various pathophysiological processes.Molecular analysis of EVs is currently being considered an emerging tool for diseases diagnosis.However,the small size and heterogeneity of EVs has staggered the EVs research for diseases diagnosis.DNA nanotechnology enables self-assembly of versatile DNA nanostructures and has shown enormous potential in assisting EVs biosensing.In this review,we briefly introduce the recent advances in DNA nanotechnology approaches for EVs detection.The approaches were categorized based on the dimension of DNA nanostructures.We provide critical evaluation of these approaches,and summarize the pros and cons of specific methods.Further,we discuss the challenges and future perspectives in this field. 展开更多
关键词 DNA nanotechnology Extracellular vesicles Lipid biopsy DNA-enabled biosensors Rolling circle amplification
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A flexible metal-organic framework with double interpenetration for highly selective CO_2 capture at room temperature 被引量:1
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作者 Bingcong Zhou Haowen Yang +4 位作者 Yan Deng Ming liu Bin liu Nongyue He zhiyang li 《Science China Chemistry》 SCIE EI CAS CSCD 2016年第8期1051-1058,共8页
MicroRNAs (miRNAs) are small non-coding RNAs that regulate gene expression at the post-transcriptional level, and their aberrant expression occurs during the development of malignant diseases. Recently, miRNAs have ... MicroRNAs (miRNAs) are small non-coding RNAs that regulate gene expression at the post-transcriptional level, and their aberrant expression occurs during the development of malignant diseases. Recently, miRNAs have been proposed as potential prognostic and predictive biomarkers for early diagnosis. However, a major obstacle in rapid miRNA analysis from real samples is the lack of ultrasensitive and quantitative techniques. In this regard, the use of chemiluminescence (CL) system offers a highly sensitive strategy for detecting miRNAs. In this article, an ultrasensitive approach has been established for the quantification ofmiRNAs, using magnetic beads (MBs) and alkaline phosphatase (AP)-based CL system. This technique depends on sandwich hybridization among MBs-labeled capture probes, target miRNAs and biotin-labeled reporter probes, conjugation of streptavidin-alkaline phosphatase (SA-AP) to biotin-labeled reporter probes, and CL detection of AP-linked targets. Detection of miR-21 with this technique demonstrated a high selectivity and an ultralow limit of detection (LOD) of 60 fM with an extraordinarily wide range of six orders of magnitudes. The quantitation could be achieved by direct detecting target miRNA in serum samples within a total time of 1.5 h and did not require reverse transcription and polymerase chain reaction (PCR) amplification. Therefore, this developed method shows great potential for early cancer diagnosis based on miRNAs as biomarkers. 展开更多
关键词 MicroRNA QUANTITATION magnetic bead CHEMILUMINESCENCE liver cancer
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Extracellular vesicles based electrochemical biosensors for detection of cancer cells:A review 被引量:1
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作者 Hui Xie Kaili Di +9 位作者 Rongrong Huang Adeel Khan Yanyan Xia Hongpan Xu Chang liu Tingting Tan Xinyu Tian Han Shen Nongyue He zhiyang li 《Chinese Chemical Letters》 SCIE CAS CSCD 2020年第7期1737-1745,共9页
Extracellular vesicles(EVs)derived from cancer cells are considered as ideal biomarker for liquid biopsy in cancer diagnosis,and are stable and abundant.Electrochemical methods for the detection of EVs are prefe rred ... Extracellular vesicles(EVs)derived from cancer cells are considered as ideal biomarker for liquid biopsy in cancer diagnosis,and are stable and abundant.Electrochemical methods for the detection of EVs are prefe rred over co nventional methods such as Western blotting and enzyme-linked immunosorbent assay for their high sensitivity and real-time detection.This article summaries studies proposing the electrochemical methods utilizing immunological and molecular methodologies for detecting EVs derived biomacromolecules such as miRNAs and transme mbrane protein for cancer diagnosis.Moreover,the electrochemical detection methods are compared and future prospects for the development of electrochemical methods for EVs detection are concluded. 展开更多
关键词 Cancerous Extracellular vesicles ELECTROCHEMICAL Biosensors DETECTION
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Microfluidic generation of barcodes with in situ synthesized perovskite quantum dot encapsulation
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作者 Feika Bian lingyu Sun +3 位作者 Yu Wang Dagan Zhang zhiyang li Yuanjin Zhao 《Science China Chemistry》 SCIE EI CSCD 2021年第9期1540-1546,共7页
Perovskite quantum dots(PQDs)are new class of optoelectronic materials,which have been widely studied for their extraordinary physical properties.Attempts to develop these materials are tending to make their fabricati... Perovskite quantum dots(PQDs)are new class of optoelectronic materials,which have been widely studied for their extraordinary physical properties.Attempts to develop these materials are tending to make their fabrication much controllable and extend their values in different areas.Here,we present a novel strategy for one-step in situ synthesis of PQD-encapsulated barcode particles with the assistance of microfluidic technique.By changing the halide ratio in perovskite precursor solutions that emulsified in microfluidic devices,a series of PQDs with different colors have been successfully fabricated,which made them ideal materials as barcodes.Because of the stable encapsulation of ethyleneglycol dimethacrylate(EGDMA)resin,the PQD-encapsulated barcode particles were with no cytotoxicity and could be anti-quenched.It was demonstrated for the first time that the PQD-encapsutated barcode particles by microfluidics were valuable for multiplex biomolecular encoding and assays.These features indicate that the PQD-encapsutated barcode particles by microfluidics are ideal for many practical applications and have a broad prospect in biomedical field. 展开更多
关键词 microfluidics droplet perovskite quantum dot BARCODE JANUS
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