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Clinical characteristics and outcomes of bacteremia in Staphylococcus aureus community-onset pneumonia among children

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Clinical characteristics and outcomes of bacteremia in Staph...

胶原酶生物学特征及胶原酶注射治疗椎间盘突出症的临床应用

2015年浙江省医学会儿科学分会学术年会暨儿内科疾病诊治新进展国家级继续教育学习班

作者： Wen SH Wu HJ Lin L zhang wx zhang HL Zhu LL Guo SZ Li CC Department of Pediatric Respiratory Medicine Yuying Children’s Hospital affiliated to Wenzhoumedical University

Objective Early recognition of bacteremia in Staphylococcus aureus community-onset pneumonia(COP)is important for clinical *** aim of our research was to investigate the clinical characteristics and outcomes differences between bacteremia and nonbacteremia in *** COP *** We conducted a retrospective study of younger than 14 years old children admitted to our hospital with ***

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中国组织工程研究与临床康复 2007年第26期11卷 5211-5214页

作者：张文祥倪家骧首都医科大学宣武医院疼痛诊疗科北京市100053

目的:充分认识胶原酶的生物学特征及其注射治疗对椎间盘的影响以及其在椎间盘突出症中的重要作用。资料来源:应用计算机检索CNKI期刊全文数据库医药卫生类2000-01/2007-02期间的文章,检索词:注射用胶原酶。同时检索Pubmed数据库2000-01/... 详细信息

目的:充分认识胶原酶的生物学特征及其注射治疗对椎间盘的影响以及其在椎间盘突出症中的重要作用。资料来源:应用计算机检索CNKI期刊全文数据库医药卫生类2000-01/2007-02期间的文章,检索词:注射用胶原酶。同时检索Pubmed数据库2000-01/2007-02期间的文章,检索词:collaganase AND disk。资料选择:对资料进行初审,选择从基础药理到临床应用密切相关的文献查找原文。然后选择在临床方面病例数较多的文献,特别把具有代表性的观点列举出来。资料提炼:共收集到相关中文文献72条,按上述标准纳入15条。英文文献30条,按上述标准纳入15条。资料综合:篇中有10篇侧重于胶原酶的药理及其对脊髓和神经影响的基础研究。其余20篇侧重于临床应用总结分析及推广。30结论:因胶原酶的生物学特征,胶原酶注射是目前治疗椎间盘突出的最有效方法之一,但其安全性以及对脊髓和神经的远期影响有待于进一步研究。

关键词：胶原酶椎间盘突出症综述文献生物制剂生物疗法

自身免疫性肝炎大鼠模型外周血淋巴细胞体外培养与褪黑素的影响

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中国组织工程研究与临床康复 2007年第28期11卷 5511-5514页

作者：丁体龙马勇袁福华张文学解放军第一二三医院南京军区肝病中心安徽省蚌埠市233015

目的:观察褪黑素对体外培养淋巴细胞增殖及促进细胞因子分泌的作用。方法:实验于2004-10/2006-10在解放军第一二三医院南京军区肝病中心实验室完成。①实验材料:Wistar大鼠,雄性,3月龄,体质量(230±20)g,购自上海斯莱克实验动物有限责... 详细信息

目的:观察褪黑素对体外培养淋巴细胞增殖及促进细胞因子分泌的作用。方法:实验于2004-10/2006-10在解放军第一二三医院南京军区肝病中心实验室完成。①实验材料:Wistar大鼠,雄性,3月龄,体质量(230±20)g,购自上海斯莱克实验动物有限责任公司。褪黑素:美国Sigma公司产品。②实验方法:采用弗氏完全佐剂加肝细胞特异性脂蛋白法建立自身免疫性肝炎大鼠模型。分别抽取正常大鼠及模型大鼠的外周血,实验室常规培养,并将其分为3组:褪黑素组培养基中加褪黑素使终浓度为2mg/L;促肝细胞生长素组培养基中加促肝细胞生长素使终浓度为2mg/L;空白对照组培养基中不加任何细胞分裂刺激剂。③实验评估:培养48h后,对外周血淋巴细胞进行常规计数并采用液体闪烁计数仪记录1min计数结果值。用于观察褪黑素与促肝细胞生长素促进外周血淋巴细胞增殖的效果。并检测培养上清液中的各细胞因子浓度,用于观察褪黑素与促肝细胞生长素促进外周血淋巴细胞分泌细胞因子的作用。结果:①褪黑素对正常大鼠外周血淋巴细胞有促进增殖作用,细胞数与1min计数值较空白对照组明显升高(P0.05),促肝细胞生长素组Th1和Th2细胞因子与空白对照组无明显差异(P>0.05)。④在褪黑素作用下,模型大鼠Th1细胞因子IL-2和IFN-γ水平较空白对照和促肝细胞生长素组明显升高(P0.05)。结论:褪黑素对自身免疫性肝炎大鼠外周血淋巴细胞有较强的刺激分裂作用。

关键词：褪黑素自身免疫性肝炎外周血淋巴细胞体外培养

Diatomic Pd catalyst with conjugated backbone for synergistic electrochemical CO_(2)reduction

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Nano Research 2024年第6期17卷 4850-4855页

作者： Wenxuan zhang Mengran zhang Hongjuan Wang Wen zhang Min zhang MOE International Joint Laboratory of Materials Microstructure Institute for New Energy Materials and Low Carbon TechnologiesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion School of Chemistry and Chemical EngineeringTianjin University of TechnologyTianjin 300384China

Double-site catalysts have attracted widespread attention in the field of electrocatalysis due to their high metal loading,adjustable active centres,and electronic valence ***,the development of bimetallic sites catalysts that coordinate with definite atoms is still in the exploratory ***,we designed and synthesized a bimetallic palladium complex(BPB-Pd_(2))with conjugated *** supported BPB-Pd_(2)was applied to electrochemical CO_(2)reduction reaction(CO_(2)RR)for the first *** as-obtained BPB-Pd_(2)gives an exceptional Faradaic efficiency of CO(FECO)of 94.4%at−0.80 V *** hydrogen electrode(RHE),which is significantly superior to monoatomic palladium catalyst(BPB-Pd1).The density functional theory(DFT)calculations revealed that the essential reason for the outstanding activity of BPB-Pd_(2)toward CO_(2)RR was that the electronic effect between diatomic palladium reduces the free energy change for CO_(2)RR ***,BPB-Pd_(2)exhibits moderate free energy change to form COOH*intermediate,which was beneficial for the generation of CO in CO_(2)RR.

关键词： synthesis electrocatalysis CO_(2)reduction bimetallic palladium complex synergistic catalysis

N-doped graphene quantum dot-decorated N-TiO2/P-doped porous hollow g-C_(3)N_(4) nanotube composite photocatalysts for antibiotic photodegradation and H2 production

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International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 165-178页

作者： Jingshu Yuan Yao zhang Xiaoyan zhang Junjie zhang Shen’gen zhang Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Xi’an Fanyi University Xi’an 710105China Shunde Graduate School of University of Science and Technology Beijing Foshan 528399China State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyMacao SAR 820000China

Exclusive responsiveness to ultraviolet light (~3.2 eV) and high photogenerated charge recombination rate are the two primary drawbacks of pure TiO_(2). We combined N-doped graphene quantum dots (N-GQDs), morphology regulation, and heterojunction construction strategies to synthesize N-GQD/N-doped TiO_(2)/P-doped porous hollow g-C_(3)N_(4) nanotube (PCN) composite photocatalysts (denoted as G-TPCN). The optimal sample (G-TPCN doped with 0.1wt% N-GQD, denoted as 0.1% G-TPCN) exhibits significantly enhanced photoabsorption, which is attributed to the change in bandgap caused by elemental doping (P and N), the improved light-harvesting resulting from the tube structure, and the upconversion effect of N-GQDs. In addition, the internal charge separation and transfer capability of0.1% G-TPCN are dramatically boosted, and its carrier concentration is 3.7, 2.3, and 1.9 times that of N-TiO_(2), PCN, and N-TiO_(2)/PCN(TPCN-1), respectively. This phenomenon is attributed to the formation of Z-scheme heterojunction between N-TiO_(2) and PCNs, the excellent electron conduction ability of N-GQDs, and the short transfer distance caused by the porous nanotube structure. Compared with those of N-TiO_(2), PCNs, and TPCN-1, the H2 production activity of 0.1%G-TPCN under visible light is enhanced by 12.4, 2.3, and 1.4times, respectively, and its ciprofloxacin (CIP) degradation rate is increased by 7.9, 5.7, and 2.9 times, respectively. The optimized performance benefits from excellent photoresponsiveness and improved carrier separation and migration efficiencies. Finally, the photocatalytic mechanism of 0.1% G-TPCN and five possible degradation pathways of CIP are proposed. This study clarifies the mechanism of multiple modification strategies to synergistically improve the photocatalytic performance of 0.1% G-TPCN and provides a potential strategy for rationally designing novel photocatalysts for environmental remediation and solar energy conversion.

关键词： N-doped TiO_(2) N-doped graphene quantum dots P-doped g-C_(3)N_(4) porous hollow nanotube heterojunction photocatalysis

Reversing free-electron transfer of sulfide cocatalyst for exceptional photocatalytic H_(2)evolution

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Journal of Materials Science & Technology 2024年第4期171卷 147-149页

作者： Yanfeng zhang Zhenyi zhang National Experimental Chemistry Teaching Center Hebei Key Laboratory of Inorganic Nano-materialsCollege of Chemistry and Materials ScienceHebei Normal UniversityShijiazhuang 050024China Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission Key Laboratory of Photosensitive Materials and Devices of Liaoning ProvinceSchool of Physics and Materials EngineeringDalian Minzu UniversityDalian 116600China

Recently,Yu and co-workers deeply explore the potential impact of free electron transfer between co-catalysts and photocatalyst carriers on H_(2)evolution efficiency of active sites over MoS_(2+x).They pro-pose an electron-reversal tactics to evade the unexpected electron transfer and synchronously regulate the above transfer in a beneficial orientation for weakening hydrogen adsorption on S ***,this highlight not only discusses and summarizes the essences of electron reversal and the optimized H ad-sorption/desorption mechanism,but also emphasizes the significance of femtosecond transient absorp-tion spectroscopy(fs-TAS)and in-situ irradiated X-ray photoelectron spectroscopy(ISI-XPS)for revealing charge transfer dynamics and *** anticipate that this highlight can disseminate a new per-spective on the roles of photocatalyst carriers in improving cocatalytic H_(2)-production kinetics.

关键词： Photocatalysis Cocatalyst Electron reversal Antibonding-orbital occupancy S–H bonds

相关信号转导分子在创伤性兔膝骨关节炎发病中的变化

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中国组织工程研究与临床康复 2007年第49期11卷 9886-9889页

作者：张文贤张晓刚李卫平吕江宏杨灵歌甘肃省中医院骨科甘肃省兰州市730050

目的:在创伤性兔膝骨关节炎的发病机制中关节软骨细胞凋亡、诱导型一氧化氮合酶、基质金属蛋白酶组织抑制因子3、尿激酶型纤溶酶原激活物及其受体蛋白均会发生一些变化,观察其相关特征,从而确立骨关节炎"细胞通讯"的病理机制。方法:实验... 详细信息

目的:在创伤性兔膝骨关节炎的发病机制中关节软骨细胞凋亡、诱导型一氧化氮合酶、基质金属蛋白酶组织抑制因子3、尿激酶型纤溶酶原激活物及其受体蛋白均会发生一些变化,观察其相关特征,从而确立骨关节炎"细胞通讯"的病理机制。方法:实验于2004-07/2006-07在兰州大学第一附属医院中心实验室及甘肃中医学院实验室完成。①实验动物:将36只健康青紫蓝家兔(雌雄各半)随机分成正常组、模型组各18只。②实验方法:模型组用硫喷妥钠30mg/kg腹腔麻醉,在无菌条件下取双侧膝关节内侧切口长约3cm,直视下探查关节腔无原发病变后,用眼科剪伸入切断前后交叉韧带、内侧副韧带、完整切除内侧半月板进行造模,正常组不作任何处理。③实验评估:运用流式细胞分析法、免疫组化法分别于6、8周两个时期进行DNA倍体含量、基质金属蛋白酶组织抑制因子3、尿激酶型纤溶酶原激活物及其受体蛋白、诱导型一氧化氮合酶蛋白阳性强度观察。结果:参加实验36只家兔,进入结果分析20只。①诱导型一氧化氮合酶蛋白表达:6周时各组间差异无显著性,8周时模型组损伤胶原化区与各组间差异显著(P<0.05)。②基质金属蛋白酶组织抑制因子3蛋白表达:6周时各组间比较差异有显著性,正常组6周和8周比较差异有显著性(P<0.05)。③细胞凋亡情况:8周时正常组与模型组DNA比率差异有显著性、但细胞凋亡均数差异无显著性。④尿激酶型纤溶酶原激活物及其受体蛋白表达:6,8周时各组间比较差异有显著性;正常组与模型组损伤胶原化区、正常组与模型组增殖肥厚区、正常组与模型组无损伤区;损伤胶原化区与增殖肥厚区、损伤胶原化区与无损伤区间差异有统计学意义(P<0.05);正常组和模型组6周和8周比较差异均有显著性(P<0.05)。结论:骨关节炎病理机制中存在破坏与修复相互拮抗平衡的分子"多轴心机制"。

关键词：骨关节炎细胞凋亡尿激酶型纤溶酶原激活物及其受体蛋白基质金属蛋白酶组织抑制因子3 诱导型一氧化氮合酶

Inter-well internal resonance analysis of rectangular asymmetric cross-ply bistable composite laminated cantilever shell under transverse foundation excitation

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Applied Mathematics and Mechanics(English Edition) 2024年第8期45卷 1353-1370页

作者： Lele REN Wei zhang Yufei zhang State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong UniversityShanghai 200240China Department of Mechanics Guangxi UniversityNanning 530004China Beijing Key Laboratory of Nonlinear Vibrations and Strength of Mechanical Structures College of Mechanical EngineeringBeijing University of TechnologyBeijing 100124China

The chaotic dynamic snap-through and complex nonlinear vibrations are investigated in a rectangular asymmetric cross-ply bistable composite laminated cantilever shell,in cases of 1:2 inter-well internal resonance and primary *** transverse foundation excitation is applied to the fixed end of the structure,and the other end is in a free *** first-order approximate multiple scales method is employed to perform the perturbation analysis on the dimensionless two-degree-of-freedom ordinary differential motion control *** four-dimensional averaged equations are derived in both polar and rectangular coordinate *** from the obtained frequency-amplitude and force-amplitude response curves,a detailed analysis is conducted to examine the impacts of excitation amplitude,damping coefficient,and tuning parameter on the nonlinear internal resonance characteristics of the *** nonlinear softening characteristic is exhibited in the upper stable-state,while the lower stable-state demonstrates the softening and linearity *** simulation is carried out using the fourth-order Runge-Kutta method,and a series of nonlinear response curves are *** the excitation amplitude further elucidates the global bifurcation and chaotic dynamic snap-through characteristics of the bistable cantilever shell.

关键词： bistable composite laminated cantilever shell inter-well internal resonance primary resonance chaotic dynamic snap-through complex nonlinear vibration

Oxygen reduction electrocatalysis:From conventional to single-atomic platinum-based catalysts for proton exchange membrane fuel cells

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Frontiers in Energy 2024年第2期18卷 206-222页

作者： Cheng YUAN Shiming zhang Jiujun zhang Institute for Sustainable Energy/College of Sciences Shanghai UniversityShanghai 200444China

Platinum(Pt)-based materials are still the most efficient and practical catalysts to drive the sluggish kinetics of cathodic oxygen reduction reaction(ORR)in proton exchange membrane fuel cells(PEMFCs).However,their catalysis and stability performance still need to be further improved in terms of corrosion of both carbon support and Pt catalyst particles as well as Pt loading *** on the developed synthetic strategies of alloying/nanostructuring Pt particles and modifying/innovating supports in developing conventional Pt-based catalysts,Pt single-atom catalysts(Pt SACs)as the recently burgeoning hot materials with a potential to achieve the maximum utilization of Pt are comprehensively reviewed in this *** design thoughts and synthesis of various isolated,alloyed,and nanoparticlecontained Pt SACs are *** single-atomic Pt coordinating with non-metals and alloying with metals as well as the metal-support interactions of Pt single-atoms with carbon/non-carbon supports are emphasized in terms of the ORR activity and stability of the *** advance further research and development of Pt SACs for viable implementation in PEMFCs,various technical challenges and several potential research directions are outlined.

关键词： oxygen reduction electrocatalysis Pt singleatom catalysts conventional Pt-based catalysts design thoughts and synthesis metal-support interactions