Performance breakthrough of electrocatalysts highly relies on the regulation of internal structures and electronic states.In present work,for the first time,we successfully synthesized nitrogen doped FeS_(2) nanoparti...Performance breakthrough of electrocatalysts highly relies on the regulation of internal structures and electronic states.In present work,for the first time,we successfully synthesized nitrogen doped FeS_(2) nanoparticles(N-FeS_(2))as the electrocatalysts for hydrogen evolution reaction(HER).The band structure and electronic state of FeS_(2) are modulated by a nitrogen doping strategy,as confirmed by X-ray photoelectron spectroscopy(XPS),X-ray absorption spectroscopy(XAS)and density functional theory(DFT)calculations.Owing to the band structure and electronic state regulation as well as the weakening of H-S interaction,the designed N-FeS_(2) electrocatalyst exhibits superior catalytic performance with a low overpotential(~126 mV at 10 mA cm^(-2))and excellent activity stability under alkaline conditions,which is substantially improved as compared with that of the pure FeS_(2) counterpart.Our work demonstrates that the modulation of electron state and band structure of an electrocatalyst,which can provide a valuable guidance for designing excellent catalysts for hydrogen evolution reaction and beyond.展开更多
The identification of antemortem burns and postmortem burns is essential in forensic practice.In this study,microRNA(miRNA)microarray analysis was conducted to identify differentially expressed miRNAs in the skin of a...The identification of antemortem burns and postmortem burns is essential in forensic practice.In this study,microRNA(miRNA)microarray analysis was conducted to identify differentially expressed miRNAs in the skin of an experimental burn model.Microarray analysis revealed 24 differentially expressed miRNAs in antemortem burned mice skin,with 19 miRNAs significantly upregulated and 5 downregulated.Based on the intersection predicted using three databases(Targetscan,microRNA.org,and PITA),293 potential miRNA targets were identified.These dysregulated miRNAs and their predicted targets were further analyzed using the Gene Ontology and Kyoto Encyclopedia of Genes and Genomes databases.Several functional categories and signaling pathways were enriched,including the“fc epsilon ri signaling pathway,”“endometrial cancer,”and“mTOR signaling pathway.”Expression patterns of 10 differentially expressed miRNAs were verified by reverse transcription‑quantitative polymerase chain reaction in mice skins.The results agreed with the results of microarray analysis.These findings suggest that differentially expressed miRNAs revealed by microarray are potential markers for forensic molecular diagnosis of antemortem burns.展开更多
Visible-light-driven photochemical Cadogan-type cyclization has been discovered.The organic D-A type photosensitizer 4 CzIPN found to be an efficient mediator to transfer energy from photons to the transient intermedi...Visible-light-driven photochemical Cadogan-type cyclization has been discovered.The organic D-A type photosensitizer 4 CzIPN found to be an efficient mediator to transfer energy from photons to the transient intermediate that breaks the barriers of deoxygenation in Cadogan reaction and enables a mild metalfree access to carbazoles and related heterocycles.DFT calculation results indicate mildly endergonic formation of the intermediate complex of nitrobiarenes and PPh3,which corresponds with experimental findings regarding reaction temperature.The robust synthetic capacity of the photoredox Cadogan reaction systems has been demonstrated by the viable productivity of a broad range of carbazoles and related N-heterocycles with good tolerance of various functionalities.展开更多
基金supported by National Key R&D Program of China(2017YFA0403402,2017YFA0700104)the National Natural Science Foundation of China(Grant Nos.11875258 and U1732232)+2 种基金the DNL Cooperation Fund,CAS(DNL180201)the Fundamental Research Funds for the Central Universities(Nos.WK2060190081)Users with Excellence Program of Hefei Science Center CAS(Nos.2018HSC-UE003 and 2019HSC-UE004)。
文摘Performance breakthrough of electrocatalysts highly relies on the regulation of internal structures and electronic states.In present work,for the first time,we successfully synthesized nitrogen doped FeS_(2) nanoparticles(N-FeS_(2))as the electrocatalysts for hydrogen evolution reaction(HER).The band structure and electronic state of FeS_(2) are modulated by a nitrogen doping strategy,as confirmed by X-ray photoelectron spectroscopy(XPS),X-ray absorption spectroscopy(XAS)and density functional theory(DFT)calculations.Owing to the band structure and electronic state regulation as well as the weakening of H-S interaction,the designed N-FeS_(2) electrocatalyst exhibits superior catalytic performance with a low overpotential(~126 mV at 10 mA cm^(-2))and excellent activity stability under alkaline conditions,which is substantially improved as compared with that of the pure FeS_(2) counterpart.Our work demonstrates that the modulation of electron state and band structure of an electrocatalyst,which can provide a valuable guidance for designing excellent catalysts for hydrogen evolution reaction and beyond.
基金the National Natural Science Foundation of China(Grant No.81401556 and 81601641)the Natural Science Foundation of Guangdong Province(No.2014A030310504 and 2014A030310293)+1 种基金the Scientific Research Foundation for the Returned Overseas Chinese Scholars,State Education Ministry(No.2015-311)the Special Foundation of President of School of Public Health of Southern Medical University(Grant No.GW201619).
文摘The identification of antemortem burns and postmortem burns is essential in forensic practice.In this study,microRNA(miRNA)microarray analysis was conducted to identify differentially expressed miRNAs in the skin of an experimental burn model.Microarray analysis revealed 24 differentially expressed miRNAs in antemortem burned mice skin,with 19 miRNAs significantly upregulated and 5 downregulated.Based on the intersection predicted using three databases(Targetscan,microRNA.org,and PITA),293 potential miRNA targets were identified.These dysregulated miRNAs and their predicted targets were further analyzed using the Gene Ontology and Kyoto Encyclopedia of Genes and Genomes databases.Several functional categories and signaling pathways were enriched,including the“fc epsilon ri signaling pathway,”“endometrial cancer,”and“mTOR signaling pathway.”Expression patterns of 10 differentially expressed miRNAs were verified by reverse transcription‑quantitative polymerase chain reaction in mice skins.The results agreed with the results of microarray analysis.These findings suggest that differentially expressed miRNAs revealed by microarray are potential markers for forensic molecular diagnosis of antemortem burns.
基金supported by the National Natural Science Foundation of China (No.22071211)the Science and Technology Planning Project of Hunan Province (No.2019RS2039)+1 种基金Hunan Provincial Natural Science Foundation of China (No.2020JJ3032)the Collaborative Innovation Center of New Chemical Technologies for Environmental Benignity and Efficient Resource Utilization。
文摘Visible-light-driven photochemical Cadogan-type cyclization has been discovered.The organic D-A type photosensitizer 4 CzIPN found to be an efficient mediator to transfer energy from photons to the transient intermediate that breaks the barriers of deoxygenation in Cadogan reaction and enables a mild metalfree access to carbazoles and related heterocycles.DFT calculation results indicate mildly endergonic formation of the intermediate complex of nitrobiarenes and PPh3,which corresponds with experimental findings regarding reaction temperature.The robust synthetic capacity of the photoredox Cadogan reaction systems has been demonstrated by the viable productivity of a broad range of carbazoles and related N-heterocycles with good tolerance of various functionalities.
