检索结果-南通市图书馆

The effect of pH on the sorption of gold nanoparticles on illite

在线全文

学校读者我要写书评

暂无评论

Acta Geochimica 2020年第2期39卷 172-180页

作者： yuhong fu Quan Wan Zonghua Qin Xin Nie Wenbin Yu Shanshan Li School of Geographic and Environmental Sciences Guizhou Normal UniversityGuiyang 550025GuizhouChina State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081GuizhouChina CAS Center for Excellence in Comparative Planetology Hefei 230026AnhuiChina School of Chemistry and Materials Science Guizhou Normal UniversityGuiyang 550025.GuizhouChina

Sorption between nanoparticles(NPs)and minerals may critically affect the migration of associated elements as well as the environmental impact of *** illite is widely present in soil,sediment,and water,we have experimentally investigated the sorption behavior of citrate-coated gold nanoparticles(AuNPs)as model NPs on illite under different pH and mineral mass *** demonstrated that sorption of these negatively charged AuNPs strongly depended on the suspension *** pH above 8,which coincided with the apparent point of zero charge(pH 7.9)of our illite sample,only marginal sorption of AuNPs was *** pH 3-8,significant sorption of AuNPs on illite was found,with almost complete sorption occurring at more acidic conditions(pH 3-4).TEM observations revealed that sorption took place through the attachment AuNPs on illite *** pH 2,AuNPs mostly formed chain-like fused structures and precipitated out of the *** upon the above pH dependence,residual organic ligand content after sorption,and complementary sorption results with positively charged AuNPs,we conclude that the sorption process is mainly driven by the electrostatic attraction between negatively charged AuNPs and positively charged illite edges,with possible competitive involvement of citrate *** expect that our findings will improve our understanding of NP-mineral interaction and the environmental fate of NPs.

关键词： Gold nanoparticles Illite Sorption Charge Electrostatic interaction

Depth profiling of arsenian pyrite in Carlin-type ores through wet chemistry

在线全文

学校读者我要写书评

暂无评论

Acta Geochimica 2023年第2期42卷 256-265页

作者： Meizhi Yang Quan Wan Xin Nie Suxing Luo yuhong fu Ping Zeng Wenqi Luo State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China University of Chinese Academy of Sciences Beijing 100049China CAS Center for Excellence in Comparative Planetology Hefei 230026China Department of Chemistry and Chemical Engineering Zunyi Normal CollegeZunyi 563006China School of Geographic and Environmental Sciences Guizhou Normal UniversityGuiyang 550001China

Enrichment of As and Au at the overgrowth rims of arsenian pyrite is a distinctive feature of Carlin-type gold *** distribution of such key elements in high resolution is of fundamental importance yet often proves *** this study,repeated non-oxidative acid etching of ore samples from Shuiyindong gold deposit was applied to enable elemental depth profiling of goldbearing arsenian pyrite ***-OES and AAS were used to determine the dissolved Fe,As,and Au concentrations in each of the etching solutions,and XPS was carried out to exam the etched mineral *** contrast to conventional ion beam etching that may cause substantial sample damage,our acid etching method does not seem to significantly alter the composition and chemical state of the *** etched depths directly converted from the measured elemental concentrations can reproducibly reach a very high resolution of~1 nm,and can be conveniently controlled through varying the etching *** the Fe and As depth profiles consistently reflect the surface oxidation property of arsenian pyrite,the Au profile displaying an obvious upward trend reveals the ore fluid evolution at the late stage of *** on our experimental results,we demonstrate that our wet chemistry method is capable of effective depth profiling of gold ore and perhaps other geological samples,with advantages surpassing many instrumental techniques including negligible sample damage,nanoscale resolution as well as isotropic etching.

关键词： Wet chemistry Acid etching Depth profiling Carlin-type gold deposits Arsenian pyrite

Concentration determination of gold nanoparticles by flame atomic absorption spectrophotometry

在线全文

学校读者我要写书评

暂无评论

Acta Geochimica 2021年第4期40卷 498-506页

作者： yuhong fu Quan Wan Zonghua Qin Shanshan Li Sen Li Ji Wang Wei Zhang School of Geographic and Environmental Sciences Guizhou Normal UniversityGuiyang 550025GuizhouChina State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081GuizhouChina CAS Center for Excellence in Comparative Planetology Hefei 230026AnhuiChina School of Chemistry and Materials Science Guizhou Normal UniversityGuiyang 550025GuizhouChina Research Center of Karst Ecological Civilization Guizhou Normal UniversityGuiyang 550025China

While engineered nanoparticles are widely used and maybe eventually released into the environment,natural nanoparticles are also commonly found in the Earth *** may critically affect the geochemical migration of associated elements and pose potential threats to the ecological *** is necessary to establish an accurate and reliable method for measuring the concentration of *** is one of the most commonly used methods for the concentration determination of ***,till now,there has been no systematic report on how experimental variables affect AAS *** this study,we used gold nanoparticles(AuNPs) as an example and studied the influences of a list of factors on the concentration determination of AuNPs by AAS,including digestion method,ionization interference,acidic medium,background correction method,and organic *** demonstrate that all these factors may have varying degrees of influence on the measured gold *** the gold colloid is digested at room temperature for more than 8 h or at 60℃ for more than 2 h,and the system contains a low concentration of organic matter,AAS can accurately measure the AuNP concentration at *** deuterium lamp background deduction method is not recommended to use for samples with lower gold concentrations.

关键词： Gold nanoparticles Atomic absorption spectrophotometry Quantitative analysis Organic matter

Astrocytes contribute to toll-like receptor 2-mediated neurodegeneration and alpha-synuclein pathology in a human midbrain Parkinson’s model

在线全文

学校读者我要写书评

暂无评论

Translational Neurodegeneration 2024年第1期13卷 119-139页

作者： Fiona Weiss Laura Hughes yuhong fu Cedric Bardy Glenda M.Halliday Nicolas Dzamko School of Medical Sciences Faculty of Medicine and Health and the Brain and Mind CentreUniversity of SydneyCamperdownNSW 2050Australia Laboratory for Human Neurophysiology and Genetics South Australian Health and Medical Research Institute(SAHMRI)AdelaideSAAustralia

Background Parkinson’s disease(PD)is characterised by degeneration of ventral midbrain dopaminergic(DA)neurons and abnormal deposition ofα-synuclein(α-syn)in *** of the innate immune pathogen recognition receptor toll-like receptor 2(TLR2)is associated with exacerbation ofα-syn ***2 is increased on neurons in the PD brain,and its activation results in the accumulation and propagation ofα-syn through autophagy inhibition in *** addition to the aggregation and propagation of pathologicalα-syn,dysfunction of astrocytes may contribute to DA neuronal death and subsequent clinical progression of ***,the role of astrocytes in TLR2-mediated PD pathology is less explored but important to address,given that TLR2 is a potential therapeutic target for *** Induced pluripotent stem cells from three controls and three PD patients were differentiated into a midbrain model comprised of neurons(including DA neurons)and *** were treated with or without the TLR2 agonist Pam3CSK4,andα-syn pathology was seeded using pre-formed *** imaging was used to assess lysosomal function andα-syn pathology in the different cell types,as well as DA neuron health and astrocyte *** TLR2 activation acutely impaired the autophagy lysosomal pathway,and potentiatedα-syn pathology seeded by pre-formed fibrils in PD neurons and astrocytes,leading to degeneration and loss of DA *** astrocytes displayed impaired chaperone-mediated autophagy reducing their ability to clear accumulatedα-syn,and increases of A1 neurotoxic phenotypic proteins SerpinG1,complement C3,PSMB8 and ***,the phenotypic changes in astrocytes correlated with a specific loss of DA *** Taken together,these results support a role for astrocyte dysfunction inα-syn accumulation and DA neuronal loss following TLR2 activation in PD.

关键词： Parkinson’s disease Toll-like receptor 2 Alpha-synuclein Astrocyte Lysosome

Seismic design of variable cross-section damped steel support frame for post equipment

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2025年第1期24卷 155-167页

作者： Yang Zhenyu Ma yuhong Zhao Guifeng Feng Zhiwei fu Mingyang Earthquake Engineering Research&Test Center Guangzhou UniversityGuangzhou 510405China School of Civil Engineering Guangzhou UniversityGuangzhou 510620China Guangdong Provincial Key Laboratory of Earthquake Engineering and Applied Technology Guangzhou 510405China

High-voltage electrical post equipment is generally installed on steel supports,which amplifies the seismic inputs and degrades the seismic performance of *** study proposed a variable cross-section damped steel support frame(VCDFS)with viscous dampers to reduce seismic responses of both tall and low-rise electrical *** VCDFS contains a trapezoidal damper layer to generate rocking motions,enabling the diagonal viscous dampers to dissipate seismic inputs.A theoretical model of post equipment with VCDFS is established,and an optimal design procedure is *** analysis shows that the remaining static stiffness ratio λ_(k) is the key parameter that determines the effectiveness of the *** VCDFS reduces the average displacement and stress response of a post insulator by 39.4%and 44.6%,respectively,together with a significant decrease in the dynamic amplification ***,it is recommended to use the VCDFS instead of the conventional latticed-steel frame in earthquake zones.

关键词： electrical post equipment steel support frame passive control seismic performance upgrading

在线全文

学校读者我要写书评

暂无评论

清代雩祭礼制与皇帝祈雨活动

历史档案 2022年第4期35卷 126-132页

作者：傅育红中国第一历史档案馆复制处 100062

雩祭,亦称雩祀,古代为求雨而举行的祭祀。《春秋传》载“龙现而雩”。那么,何谓“龙现而雩”?《后汉书·礼仪志中》注引:“谓四月昏,龙星体现,万物始盛,待雨而大,故雩祭以求雨也。”中国古人将天上的众多恒星分为28群,称为二十八宿,认... 详细信息

雩祭,亦称雩祀,古代为求雨而举行的祭祀。《春秋传》载“龙现而雩”。那么,何谓“龙现而雩”?《后汉书·礼仪志中》注引:“谓四月昏,龙星体现,万物始盛,待雨而大,故雩祭以求雨也。”中国古人将天上的众多恒星分为28群,称为二十八宿,认为天上每一颗星体都对应着一位护佑神灵,它们常宿在固定的方位,有规律地显现在天空。龙星于每年四月间日落之后现于东方,此时大地万物也正值生长旺盛之期,急待更多的雨水浇灌,所以正当举行祭天求雨礼之时。据史料记载,古人举行雩祭之典分为“常雩”和“大雩”两种。常雩,“为每岁常行之礼”①,祭告天地神灵为百谷祈膏雨--每年孟夏之月(四月),“龙现”之后,卜日致祭,即使雩祭时不旱,亦为雩--这是定期举行之礼;若雩祭后仍不雨,或雨不足,再雩,此为因旱而雩。大雩,就是为亢旱而设之雩礼。孟夏常雩之后,旱甚,则大雩--大雩礼不得轻易举行。雩祭作为清代祭天(冬至祭天、孟春祈谷、孟夏常雩、旱甚大雩)隆重典礼之一,列入大清会典,并且一直延续到光绪三十二年(1906)②。

关键词：光绪三十二年大清会典二十八宿《春秋传》史料记载雩祭求雨常雩

N-terminusα-synuclein detection reveals new and more diverse aggregate morphologies in multiple system atrophy and Parkinson’s disease

在线全文

学校读者我要写书评

暂无评论

Translational Neurodegeneration 2024年第1期13卷 26-41页

作者： James A.Wiseman yuhong fu Richard L.M.Faull Clinton P.Turner Maurice A.Curtis Glenda M.Halliday Birger V.Dieriks Department of Anatomy and Medical Imaging University of Auckland85 Park RoadGraftonAuckland 1142New Zealand Centre for Brain Research University of AucklandAuckland 1023New Zealand Brain and Mind Centre&Faculty of Medicine and Health School of Medical Sciences The University of SydneySydneyNSW 2050Australia LabPlus Department of Anatomical PathologyTe Whatu OraAucklandNew Zealand Neuroscience Research Australia&Faculty of Medicine School of Medical Sciences University of New South WalesSydneyNSW 2052Australia

Background Parkinson’s disease(PD)and multiple system atrophy(MSA)are classified asα-synucleinopathies and are primarily differentiated by their clinical *** these diseases based on their specificα-synuclein(α-Syn)proteoform pathologies is crucial for accurate antemortem biomarker *** identifiedα-Syn pathologies in PD raise questions about whether MSA exhibits a similar *** prompted the need for a comparative study focusing onα-Syn epitope-specific immunoreactivities in both diseases,which could clarify the extent of pathological overlap and diversity,and guide more accurate biomarker *** We utilised a multiplex immunohistochemical approach to detect multiple structural domains ofα-Syn proteoforms across multiple regions prone to pathological accumulation in MSA(n=10)and PD(n=10).Comparison of epitope-specificα-Syn proteoforms was performed in the MSA medulla,inferior olivary nucleus,substantia nigra,hippocampus,and cerebellum,and in the PD olfactory bulb,medulla,substantia nigra,hippocampus,and entorhinal *** N-terminus and C-terminus antibodies detected significantly moreα-Syn pathology in MSA than antibodies for phosphorylated(pS129)α-Syn,which are classically used to detectα-***,C-terminus immunolabelling is more pronounced in MSA compared to ***,N-terminus immunolabelling consistently detected the highest percentage ofα-Syn across pathologically burdened regions of both diseases,which could be of biological *** expected,oligodendroglial involvement distinguished MSA from PD,but in contrast to PD,no substantial astrocytic or microglialα-Syn accumulation in MSA *** data confirm glial-specific changes between these diseases when immunolabelling the N-terminus *** comparison,N-terminus neuronalα-Syn was present in PD and MSA,with most MSA neurons lacking pS129α-Syn *** explains why characterisation of neuronal MSA pathologies is lacki

关键词： α-Synuclein Lewy body diseases Parkinson’s disease Multiple system atrophy N-terminus Epitope-specific Multiplex Truncational variants

胸脐皮瓣修复多发伤致四肢大面积软组织缺损的护理

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

江苏医药 2010年第14期36卷 1637-1639页

作者：傅育红无锡市手外科医院无锡骨科医院护理部 214061

目的探讨胸脐皮瓣修复多发伤致四肢大面积软组织缺损患者的护理措施。方法四肢大面积软组织缺损患者15例,围术期护理措施包括伤后注重骨折固定、控制伤口出血、肢体血供的观察及感染的控制、加强术后体位管理、预防并发症和指导早期... 详细信息

目的探讨胸脐皮瓣修复多发伤致四肢大面积软组织缺损患者的护理措施。方法四肢大面积软组织缺损患者15例,围术期护理措施包括伤后注重骨折固定、控制伤口出血、肢体血供的观察及感染的控制、加强术后体位管理、预防并发症和指导早期功能锻炼。结果 15例患者中,创面、骨折愈合,皮瓣成活14例,坏死1例。上肢屈肘功能恢复良好9例,下肢行走及负重功能恢复6例。结论加强基础护理、术后体位管理、观察皮瓣血供、预防并发症、肢体功能锻炼是是胸脐皮瓣手术成功的重要因素。

关键词：皮瓣移植护理

俄罗斯高中学校精英教育培养模式及启示--以柯尔莫哥洛夫寄宿学校为例

在线全文

学校读者我要写书评

暂无评论

外国中小学教育 2018年第10期 15-21页

作者：付玉红东北师范大学教育学部北华大学教育科学学院

精英教育是俄罗斯实施人才强国和科技强国战略的一个重要组成部分。莫斯科大学附属柯尔莫哥洛夫寄宿学校是俄罗斯以政府为主导科学家办学培养科技英才的典型代表。寄宿学校的产生发展、选拔招生、课程设置及培养过程都体现出这所普通高... 详细信息

精英教育是俄罗斯实施人才强国和科技强国战略的一个重要组成部分。莫斯科大学附属柯尔莫哥洛夫寄宿学校是俄罗斯以政府为主导科学家办学培养科技英才的典型代表。寄宿学校的产生发展、选拔招生、课程设置及培养过程都体现出这所普通高中实施精英教育的办学理念。对寄宿学校的分析研究可以为我国普通高中多样化发展提供一点启示。

关键词：寄宿学校莫斯科大学