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Deciphering dynamic surface of PtRu alloy nanocatalysts to revisit their synergistic effects during the electrooxidation

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Science China Chemistry 2024年第7期67卷 2224-2233页

作者： Xiao-Chong Li Bo Wang Zhou Yu Qiang Wan ju-Fang zheng Emmanuel Maisonhaute Xiao-Shun Zhou Ya-Hao Wang Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Institute of Physical ChemistryZhejiang Normal UniversityJinhua 321004China Laboratoire Interface et Systèmes Electrochimiques CNRS UMR 8235Sorbonne UniversitéF-75252 Paris cedex 5France

Correlating dynamic structural transformation of catalysts with the surface intermediate species under operating conditions is critical for updating the understanding of structure–performance ***,we probe the electrochemical potentialdependent surface structures and adsorbed intermediates on PtRu binary alloy nanocatalysts to revisit its synergistic mechanisms for CO electrooxidation enhanced ***-situ spectral characteristics by using modified shell-isolated nanoparticle-enhanced Raman spectroscopy,show that in acidic solution,when the potential is positively scanned from 0.1 V to 1.5 V relative to reversible hydrogen electrode(RHE),the surface of the alloy catalyst evolves from metallic PtRu to adsorbed oxygen gradually covering and accumulating on Ru sites(denoted as PtRuO_(x),x≤2),forming segregated RuO_(2),and finally forming a threedimensional oxide layer(denoted as 3D PtRuO_(4)).Moreover,molecular evidence associated with periodic density functional theory calculations reveals that electronic effects promote ruthenium to become more oxidizable and *** particular,we found here that ^(*)O and ^(*)OH at surface RuO_(x) sites are highly efficient CO oxidation active species in comparison to the same entities adsorbed on metallic Ru *** work sheds light on the complex surface dynamic process of practical Pt-based binary nanocatalysts and improves the understanding of synergistic mechanism for the development of fuel cell devices.

关键词： in-situ Raman spectroscopy surface evolution bifunctional mechanism PtRu electrooxidation

Endoplasmic reticulum stress and autophagy in cerebral ischemia/reperfusion injury:PERK as a potential target for intervention

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Neural Regeneration Research 2025年第5期20卷 1455-1466页

作者： ju zheng Yixin Li Ting Zhang Yanlin Fu Peiyan Long Xiao Gao zhengwei Wang Zhizhong Guan Xiaolan Qi Wei Hong Yan Xiao Key Laboratory of Endemic and Ethnic Diseases Ministry of Education&Key Laboratory of Medical Molecular Biology of Guizhou ProvinceGuizhou Medical UniversityGuiyangGuizhou ProvinceChina Guizhou Center for Disease Control and Prevention GuiyangGuizhou ProvinceChina Department of Histology and Embryology Guizhou Medical UniversityGuiyangGuizhou ProvinceChina Collaborative Innovation Center for Prevention and Control of Endemic and Ethnic Regional Diseases Co-constructed by the Province and Ministry GuiyangGuizhou ProvinceChina

Several studies have shown that activation of unfolded protein response and endoplasmic reticulum(ER)stress plays a crucial role in severe cerebral ischemia/reperfusion *** occurs within hours after cerebral ischemia,but the relationship between ER stress and autophagy remains *** this study,we established experimental models using oxygen-glucose deprivation/reoxygenation in PC12 cells and primary neurons to simulate cerebral ischemia/reperfusion *** found that prolongation of oxygen-glucose deprivation activated the ER stress pathway protein kinase-like endoplasmic reticulum kinase(PERK)/eukaryotic translation initiation factor 2 subunit alpha(e IF2α)-activating transcription factor 4(ATF4)-C/EBP homologous protein(CHOP),increased neuronal apoptosis,and induced ***,inhibition of ER stress using inhibitors or by si RNA knockdown of the PERK gene significantly attenuated excessive autophagy and neuronal apoptosis,indicating an interaction between autophagy and ER stress and suggesting PERK as an essential target for regulating *** autophagy with chloroquine exacerbated ER stress-induced apoptosis,indicating that normal levels of autophagy play a protective role in neuronal injury following cerebral ischemia/reperfusion *** from this study indicate that cerebral ischemia/reperfusion injury can trigger neuronal ER stress and promote autophagy,and suggest that PERK is a possible target for inhibiting excessive autophagy in cerebral ischemia/reperfusion injury.

关键词： apoptosis ATF4 autophagy C/EBP homologous protein cerebral ischemia/reperfusion injury eIF2α endoplasmic reticulum stress PERK

贵州省2022-2023年流感季A(H1N1)pdm09亚型流感病毒抗原性和血凝素基因特征

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中国疫苗和免疫 2024年第3期30卷 278-282页

作者：庄丽柯倩郑菊韦小瑜贵州省疾病预防控制中心贵州贵阳550004

目的了解贵州省A(H1N1)pdm09亚型流感病毒抗原性和血凝素(Hemagglutinin,HA)基因特征。方法选取贵州省流感监测点2022年10月至2023年3月A(H1N1)pdm09亚型流感病毒分离株,采用红细胞凝集抑制试验检测抗原性,测定HA全基因组序列,构建遗传... 详细信息

目的了解贵州省A(H1N1)pdm09亚型流感病毒抗原性和血凝素(Hemagglutinin,HA)基因特征。方法选取贵州省流感监测点2022年10月至2023年3月A(H1N1)pdm09亚型流感病毒分离株,采用红细胞凝集抑制试验检测抗原性,测定HA全基因组序列,构建遗传进化树,分析核苷酸同源性和氨基酸位点变异。结果共获得78株A(H1N1)pdm09亚型流感病毒,均鉴定为疫苗类似株。22株毒株获得HA全基因组序列,与疫苗株的核苷酸同源性为97.28%-99.14%;其中6B.1A.5a.2a、6B.1A.5a进化分支分别为19株、3株;19株发生Sb抗原决定簇的A186T和Q189E氨基酸替换并分布在1个抗原决定簇,3株发生Sa抗原决定簇的K156N和I161L氨基酸替换并分布在1个抗原决定簇。19株发生190位螺旋(184-191)A186T和Q189E以及220位环E224A氨基酸替换,3株发生220位环D222Y氨基酸替换,均发生在HA1区域。未发现糖基化位点变异。结论贵州省2022-2023年流感季A(H1N1)pdm09亚型流感病毒与疫苗株匹配性良好,但存在部分氨基酸位点变异。需加强流感病毒监测及其抗原性和基因序列分析,以利于流感防控策略制定和流感疫苗株筛选。

关键词： A(H1N1)pdm09亚型流感病毒抗原性血凝素基因特征

2020—2023年贵州省新型冠状病毒基因进化特征分析

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中国公共卫生 2024年第5期40卷 609-614页

作者：庄丽柯倩郑菊吴萍蒋维佳贵州省疾病预防控制中心实验中心病毒科贵阳550004

目的了解贵州省2020—2023年新型冠状病毒(SARS-CoV-2)基因组特征,明确其基因变异规律及关键氨基酸位点突变导致的易感性变化。方法收集贵州省2020—2023年SARS-CoV-2感染阳性患者口咽拭子和鼻咽拭子样本316份。使用高通量测序技术进行... 详细信息

目的了解贵州省2020—2023年新型冠状病毒(SARS-CoV-2)基因组特征,明确其基因变异规律及关键氨基酸位点突变导致的易感性变化。方法收集贵州省2020—2023年SARS-CoV-2感染阳性患者口咽拭子和鼻咽拭子样本316份。使用高通量测序技术进行病毒全基因组扩增和测序。通过Nextclade在线数据分析平台对下机数据进行分析,判定病毒型别与进化分支,分析其关键氨基酸位点的变异情况及遗传进化特征。结果成功获取259株新冠病毒全基因组序列,共计59种进化分支。前期(2020年1—8月)病毒进化程度较为有限,主要为原始新冠毒株(Pango分型为B.1);第2阶段(2020年9月—2021年12月)主要以德尔塔(Delta)变异株(3个进化分支)为主,包含36~39个氨基酸变异,其中S蛋白约8~10个氨基酸突变位点;第3阶段(2022年1月—2023年12月)主要以奥密克戎(Omicron)变异株(56个进化分支)为主,约包含47~66个氨基酸变异,其中S蛋白约28~42个氨基酸突变位点。整体占比前3位的分别为:奥密克戎XBB重组体及其亚分支、奥密克戎BA.5.2及其亚分支、奥密克戎BF.7变异株。结论2020—2023年贵州省SARS-CoV-2感染早期阶段发生的突变具有较高的血管紧张素转化酶2(ACE2)结合亲和力及部分免疫逃逸能力,后期发生的突变则表现出更高的免疫逃逸能力,导致全人群免疫鸿沟逐渐增加。

关键词：新型冠状病毒基因进化特征分析免疫逃逸能力贵州省

UHPLC-TOF-MS结合网络药理学及实验验证研究交泰丸治疗抑郁症的作用机制

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中国中药杂志 2024年第7期49卷 1896-1904页

作者：黄茜戴国梁杨欣怡曹阳居文政南京中医药大学附属医院临床药理科江苏南京210029

利用UHPLC-TOF-MS技术分析交泰丸在正常大鼠体内入血成分,通过网络药理学和动物实验研究交泰丸治疗抑郁症的作用机制。利用UHPLC-TOF-MS技术检测大鼠灌胃交泰丸后的入血成分,结合DisGeNET、SwissTargetPrediction等数据库筛选抑郁症与... 详细信息

利用UHPLC-TOF-MS技术分析交泰丸在正常大鼠体内入血成分,通过网络药理学和动物实验研究交泰丸治疗抑郁症的作用机制。利用UHPLC-TOF-MS技术检测大鼠灌胃交泰丸后的入血成分,结合DisGeNET、SwissTargetPrediction等数据库筛选抑郁症与交泰丸入血成分的交集靶点,构建蛋白-蛋白相互作用(protein-protein interaction,PPI)网络。将关键靶点导入DAVID平台进行基因本体论(Gene Ontology,GO)分析和京都基因与基因组百科全书(Kyoto Encyclopedia of Genes and Genomes,KEGG)通路注释,结合成分、靶点和通路,利用Cytoscape 3.9.1软件构建“成分-靶点-通路”网络,预测交泰丸治疗抑郁症的关键靶点及通路。建立大鼠慢性不可预知性温和应激(chronic unpredictable mild stress,CUMS)抑郁模型,进行行为学实验,ELISA法检测大鼠血清炎症因子和脑内神经递质水平,蛋白免疫印迹(Western blot)法检测大鼠海马组织中关键靶点表达。结果鉴定出交泰丸在正常大鼠体内入血成分共17个,10个为生物碱类化合物。入血成分与疾病共有交集靶点124个,根据PPI网络结果筛选出核心靶点52个,其中包括NLRP3和caspase-1等,KEGG富集结果显示主要涉及NOD样受体通路等15条典型通路。动物实验研究结果显示,交泰丸可显著改善CUMS抑郁模型大鼠的抑郁样行为,提高脑内神经递质5-羟色胺(5-hydroxytryptamine,5-HT)、多巴胺(dopamine,DA)及去甲肾上腺素(norepinephrine,NE)的水平,降低血清白细胞介素-1β(interlenkin-1β,IL-1β)、肿瘤坏死因子-α(tumor necrosis factor-α,TNF-α)及白细胞介素-6(interlenkin-6,IL-6)水平,下调海马区NLRP3和caspase-1蛋白表达水平,抑制NLRP3介导的NOD样受体信号通路。综上所述,交泰丸可能通过抑制NLRP3炎症小体,抑制NLRP3介导的NOD样受体通路,发挥抗抑郁的作用。

关键词：交泰丸抑郁症网络药理学 UHPLC-TOF-MS 炎症

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城市生命线安全运行监测系统设计

智能建筑与智慧城市 2024年第3期 156-158页

作者：万力郑驹合肥工业大学建筑设计院(集团)有限公司

文章介绍了城市生命线建设背景、运行监测系统架构及系统设计要求,并以天长市城市生命线工程(一期)供水安全监测项目为例,对城市生命线安全运行监测系统的设计做了详细解析。

关键词：城市生命线安全运行监测系统设计

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组态化智慧型养老模式探索及其系统架构设计

智能建筑与智慧城市 2024年第4期 5-8页

作者：万力郑驹合肥工业大学建筑设计院(集团)有限公司

文章介绍了组态化智慧型养老建设背景、建设意义及其运行模式,并对组态化智慧型养老系统架构及系统设计要求做了详细介绍。本文还对组态化智慧型养老系统应用及技术发展进行了预测。

关键词：智慧养老人工智能大数据物联网智慧安全智慧监控智慧服务

Diverse Roles of Immune Cells in Transplant Rejection and Immune Tolerance

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Engineering 2022年第3期8卷 44-56页

作者： Xiaojie Gan Jian Gu zheng ju Ling Lu Hepatobiliary Center The First Affiliated Hospital of Nanjing Medical University&Research Unit of Liver Transplantation and Transplant ImmunologyChinese Academy of Medical SciencesNanjing 210029China

Organ transplant rejection(OTR)is a complex immune reaction involving multiple cells,and it determines graft survival and patient *** present,most transplant recipients are administered a combination of immunosuppressive and biological agents to protect them from ***,immunosuppressive agents negatively impact the immune system of the patients,causing them to suffer from serious complications,such as chronic infection and malignant ***,a thorough understanding of the mechanisms involved in immune tolerance and immune rejection with regard to organ transplant(OT)is essential for developing better treatment options and improving patient *** article reviews the role of immune cells in OTR and organ transplant tolerance(OTT),including the novel cell therapies that are currently under clinical trials for transplant recipients.

关键词： Immune cells Innate immune cells Adaptive immune cells Organ transplant Immune tolerance

Upconversion Luminescence of SrTiO3：Er^3＋ Ultrafine Powders Produced by 785 nm Laser

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Chinese Journal of Chemical Physics 2008年第3期21卷 233-238页

作者： Hai Guo Yan-min Qiao ju-fang zheng Lei-hong Zhao Department of Physics Zhejiang Normal University Jinhua 321004 China Zhejiang Key Laboratory for Reactive Chemistry on 5olicl Surfaces Institute of Physical Chemistry Zhejiang Normal University Jinhua 321004 China

Er^3＋ doped SrTiO3 ultrafine powders were prepared by solid state reaction in a molten NaCl flux. The structural properties were characterized by X-ray diffraction, field emission scanning electron microscopy, and Fourier transform infrared spectroscopy. The Stokes emission spectra of Er^3＋ in SrTiO3：Er^3＋ ranging from green to near infrared region were investigated under 514.5 nm laser excitation. The green and red upconverted luminescence spectra of Er^3＋ were measured under excitation into the 419/2 level by 785 nm laser. The upconversion mechanisms were studied in detail through laser power dependence and Er^3＋ ion concentration dependence of upconverted emissions, and results show that excited state absorption and energy transfer process are the possible mechanisms for the upconversion. The upconversion properties indicate that SrTiO3：Er^3＋ may be used in upconversion phosphors.

关键词： SrTiO3 Upconversion luminescence Excited state absorption Energy transfer