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Polydopamine-modified metal-organic frameworks nanoparticles enhance the corrosion resistance and bioactivity of polycaprolactone coating on high-purity magnesium

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Journal of Magnesium and Alloys 2024年第5期12卷 2070-2089页

作者： Qingyun Fu Shaojie He Junjie Yang Ziyu Su Ping Li Xincheng Yu Weihong Jin shulan xu Zhentao Yu Dingsheng Zha Center of Oral Implantology Stomatological HospitalSouthern Medical UniversityGuangzhouChina Panyu Hospital of Chinese Medicine Guangzhou 511400China Institute of Advanced Wear&Corrosion Resistant and Functional Materials Jinan UniversityGuangzhou 510632China First Affiliated Hospital of Jinan University Guangzhou 510630China

Biodegradable magnesium(Mg)and its alloys exhibit excellent biocompatibility and mechanical compatibility,demonstrating tremendous potential for applications in ***,the rapid degradation rate has limited their clinical ***(PCL)is commonly employed as a polymer coating to impede the rapid degradation of ***,its long-term anti-corrosion capability and bioactivity are *** address these issues,polydopamine(PDA)-modified zeolitic imidazolate framework-8(PZIF-8)bioactive nanoparticles are fabricated and incorporated into the PCL *** PZIF-8 particles,featuring catechol motifs,can enhance the compactness of the PCL coating,reduce its defects,and possess biomineralization ability,thereby effectively improving its anti-corrosive and bioactive ***,the active substances released from the degradation of the PZIF-8 particles such as Zn^(2+)and PDA are beneficial for *** corrosion tests indicate that the corrosion current density of PCL-treated sample decreases by more than one order of magnitude and the amount of H_(2)released decreases from 0.23±0.12 to 0.08±0.08 ml cm^(-2)after doping with the ***,the improved corrosion resistance and released PDA and Zn^(2+)from the coating can promote osteogenic differentiation by up-regulating the expression of alkaline phosphatase activity,related osteogenic genes,and *** addition,in vivo implantation experiments in rabbit femur defects further offer strong evidence that the doping of PZIF-8 nanoparticles accelerates bone reconstruction of the PCL *** summary,this work implies a new strategy to fabricate a PCL-based coating on Mg-based implants by introducing the PZIF-8 particles for orthopedic applications.

关键词： Polydopamine ZIF-8 High-purity magnesium Polycaprolactone coating Anticorrosion Bone regeneration

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Research perspective and prospective of additive manufacturing of biodegradable magnesium-based materials

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Journal of Magnesium and Alloys 2023年第5期11卷 1485-1504页

作者： Qingyun Fu Wenqi Liang Jiaxin Huang Weihong Jin Baisong Guo Ping Li shulan xu Paul K.Chu Zhentao Yu Center of Oral Implantology Stomatological HospitalSouthern Medical UniversityGuangzhou 510280China Institute of Advanced Wear&Corrosion Resistant and Functional Materials Jinan UniversityGuangzhou 510632China Department of Physics Department of Materials Science and Engineeringand Department of Biomedical EngineeringCity University of Hong KongTat Chee AvenueKowloonHong KongChina

Biodegradable metals such as magnesium(Mg)and its alloys have attracted extensive attention in biomedical research due to their excellent mechanical properties and ***,traditional casting,extrusion,and commercial processing have limitations in manufacturing components with a complex shape/structure,and these processes may produce defects such as cavities and gas pores which can degrade the properties and usefulness of the *** to conventional techniques,additive manufacturing(AM)can be used to precisely control the geometry of workpieces made of different Mg-based materials with multiple geometric scales and produce desirable medical products for orthopedics,dentistry,and other ***,a detailed and thorough understanding of the raw materials,manufacturing processes,properties,and applications is required to foster the production of commercial Mg-based biomedical components by *** review summarizes recent advances and important issues pertaining to AM of Mg-based biomedical products and discusses future development and application trends.

关键词： Magnesium-based materials Additive manufacturing Wires and powders Biomedical metallic materials Medical devices

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数字化种植导板手术的精确性:非手术因素分析及对策的专家共识

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口腔疾病防治 2024年第5期32卷 321-329页

作者：徐淑兰李平杨烁李少冰卢海宾朱安棣黄立舒王劲茗徐世同王丽萍汤春波周延民周磊南方医科大学口腔医院(口腔医学院)口腔种植中心广东广州510280 澳门威尔口腔医疗中心中国澳门999078 中山大学光华口腔医院口腔种植科广东广州510000 广州瑞泰口腔医院广东广州510000 广州医科大学附属口腔医院口腔种植科广东广州510000 南京医科大学附属口腔医院口腔种植中心江苏南京210029 吉林大学口腔医院口腔种植中心吉林长春130021 泰康拜博医疗集团有限公司广东广州510000

计算机辅助静态导板引导种植手术的标准化流程包括术前检查、数据采集、计算机辅助设计、计算机辅助制作以及种植导板引导手术。其间每一环节产生的误差都可能导致误差的叠加效应,从而影响种植体植入的准确性。然而,临床医师往往关注于... 详细信息

计算机辅助静态导板引导种植手术的标准化流程包括术前检查、数据采集、计算机辅助设计、计算机辅助制作以及种植导板引导手术。其间每一环节产生的误差都可能导致误差的叠加效应,从而影响种植体植入的准确性。然而,临床医师往往关注于外科手术中的误差因素,却忽略了术前阶段的不规范操作导致种植手术产生不可逆转的误差。本文结合国内专家的临床实践与国内外研究进展,从种植导板手术术前检查、数据采集、导板设计、导板制作等方面,对种植导板手术的误差来源进行总结,并制定解决误差的策略,形成专家共识。①术前因素考量:术前应该根据患者口腔情况选择合适的种植导板类型,必要时选用固位螺钉辅助支持式导板;②规范数据采集流程:尽量采用锥形束CT与口外扫描法进行数据采集,建议选择小视野进行CBCT拍摄,同时保持患者头部固定,对于口内带有金属修复体的患者采用配准标记导板,并且合理控制口外扫描的环境温度与光照;③优化计算机辅助设计:建议选用手柄引导的种植系统与封闭式金属套筒,并通过标记物重叠的方式进行图像配准,另外,适当地设计固位螺钉、延伸导板的支持结构、增加导板引导段长度都是减少误差的可行方法;④改进计算机辅助制作:根据不同的打印技术设置最佳的打印参数,选择合适的打印后处理与灭菌方法也是至关重要的。

关键词：数字化种植种植导板手术非手术因素准确性患者因素数据采集导板设计导板制作

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Synthesis of crystalline g-C_(3)N_(4) with rock/molten salts for efficient photocatalysis and piezocatalysis

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Green Energy & Environment 2024年第5期9卷 890-898页

作者： Tingting xu Jung Hur Ping Niu shulan Wang Sangwook Lee Sang-Eun Chun Li Li Department of Chemistry College of ScienceNortheastern UniversityShenyang110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819China School of Metallurgy Northeastern UniversityShenyang110819China School of Materials Science and Engineering Kyungpook National UniversityDaegu41566Republic of Korea School of Industrial Technology Advances Kyungpook National UniversityDaegu41566Republic of Korea

Graphitic carbon nitride(g-C_(3)N_(4))is emerging as a promising visible-light photocatalyst while the low crystallinity with sluggish charge separation/migration dynamics signiﬁcantly restricts its practical ***,synthesizing highly crystalline g-C_(3)N_(4) with sufﬁcient surface activities still remains ***,different from using alkali molten salts which is commonly reported,we propose an approach for synthesis of highly crystalline g-C_(3)N_(4) with FeCl3/KCl rock/molten mixed *** rock salt can serve as the structure-directing template while molten salt provides the required liquid medium for ***,the synthesized photocatalyst showed further enhanced crystallinity and improved surface area along with high p/p*excitation compared with crystalline C_(3)N_(4) prepared from conventional molten-salt *** catalytically advantageous features lead to its superior photocatalytic and piezocatalytic activities with a high reactivity for overall water splitting that is not commonly reported for C_(3)N_(4).This work provides an effective strategy for structural optimization of organic semiconductor based materials and may inspire new ideas for the design of advanced photocatalysts.

关键词： High crystallinity Carbon nitride Photocatalysis Piezocatalysis Overall water splitting

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埃塞俄比亚“大学服务计划”的历史考察

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全球教育展望 2008年第10期37卷 79-83页

作者：陈明昆徐淑兰浙江师范大学非洲研究院

埃塞俄比亚早期的大学被赋予了厚重的社会责任,在办学目标上具有明显的"农村导向性"。在上世纪六、七十年代,埃塞大学校园里开展了一场影响深远的"大学服务计划"。计划要求在校大学生必须有一学年的时间深入到农村社区开展为民服务。该... 详细信息

埃塞俄比亚早期的大学被赋予了厚重的社会责任,在办学目标上具有明显的"农村导向性"。在上世纪六、七十年代,埃塞大学校园里开展了一场影响深远的"大学服务计划"。计划要求在校大学生必须有一学年的时间深入到农村社区开展为民服务。该计划在组织管理、目标任务、服务期限上十分明确,服务内容与学生的专业学习相联系,对社会进步是一种促进,对学校、学生本身是一种锻炼。该计划实施的社会效应远远超过发起者的预期,甚至引起过世界关注。虽然由于政治原因,该计划最终不得不草草收场,但大学的这种责任和精神却受到传扬。

关键词：期望责任大学服务计划农村

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934颗上颌中切牙牙根位置锥形束CT解剖分型初探

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中华口腔医学杂志 2017年第11期52卷 656-660页

作者：王朝周磊徐多玲徐淑兰南方医科大学口腔医院种植中心广州510280 南方医科大学口腔医院口腔科广州510280

目的通过锥形束CT分析上颌中切牙牙根位置、唇腭侧骨壁厚度及性别差异,为即刻种植手术提供参考.方法收集2009年1月至2014年12月于南方医科大学口腔医院种植中心就诊、需行锥行束CT检查的934例患者934颗上颌中切牙的锥形束CT数据,根据... 详细信息

目的通过锥形束CT分析上颌中切牙牙根位置、唇腭侧骨壁厚度及性别差异,为即刻种植手术提供参考.方法收集2009年1月至2014年12月于南方医科大学口腔医院种植中心就诊、需行锥行束CT检查的934例患者934颗上颌中切牙的锥形束CT数据,根据牙根在牙槽骨内矢状位置分为偏唇类、中间类、偏腭类.再将偏唇类进一步细分为Ⅰ、Ⅱ、Ⅲ3个亚类,测量釉质牙骨质界根方4 mm、根中处、根尖处的唇腭侧骨壁厚度.结果上颌中切牙牙根偏唇类占95.4%（891/934）.偏唇类中Ⅰ亚类占47.5%（423/891）,Ⅱ亚类占44.2%（394/891）,Ⅲ亚类占8.3%（74/891）.在釉质牙骨质界根方4 mm和根中处,Ⅲ亚类唇侧骨壁最大（分别为0.86和0.95 mm）;Ⅱ亚类腭侧骨壁最大（分别为1.65和2.37 mm）.根尖处Ⅰ亚类唇侧骨壁最大（1.89 mm）,Ⅲ亚类腭侧骨壁最大（7.83 mm）.结论本组研究对象大部分上颌中切牙牙根偏唇侧,其中约一半患者唇侧骨壁较充足,适合行即刻种植.

关键词：锥束计算机体层摄影术切牙牙根牙槽窝

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Riverine sulfate sources and behaviors in arid environment,Northwest China:Constraints from sulfur and oxygen isotopes

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Journal of Environmental Sciences 2024年第3期137卷 716-731页

作者： Yifu xu Wenjing Liu Bing xu Zhifang xu Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China

The fate of riverine sulfate ion (SO_(4)^(2-)) and its environmental effects in arid environment are difficult to evaluate due to its complicated sources and strongly coupled behaviors with water cycle which is significantly modified by *** understand the sulfur cycle in aquatic systems in arid environment,the chemical and sulfur and oxygen isotopic compositions (δ^(34)S_(SO4)and δ^(18)O_(SO4)) of major rivers around the Badain Jaran Desert,northwestern China,were *** rivers had averaged SO_(4)^(2-)content at 1336μmol/L,over 10times higher than the global *** δ^(34)S_(SO4)and δ^(18)O_(SO4)values ranged from-5.3‰to+11.8‰and+1.6‰to+12.8‰,*** end-member analysis and the inverse model showed that riverine sulfate was mainly derived from evaporites dissolution (0-87%),sulfide oxidation (13%-100%) and precipitation (0-33%),indicating heterogeneity in sulfur sources and behaviors along the river drainage with the lithology variations and climate *** isotopic tools combining with hydro-chemistry compositions could be applied to reveal sulfur cycle in arid *** on the calculation,sulfide oxidation plays the primary role in the headwater and upstream in the Qilian-Mountains area,where sulfide is widely *** the proportion of evaporites dissolution contributing to riverine sulfate is much higher in downstream in a drier ***,less precipitation and higher temperature can lead to more intensive evaporation,affecting the process of sulfide oxidation and enhancing the rates of evaporites dissolution and sulfate precipitation in the basin.

关键词： Sulfur and oxygen isotopes Source apportionment Inverse model Arid environment Inland rivers Northwestern China

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Laboratory evaluation of high-friction thin overlays for pavement preservation

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Frontiers of Structural and Civil Engineering 2024年第6期18卷 936-948页

作者： Ouming xu Rentao xu Lintong JIN School of Highway Chang’an UniversityXi’an 710064China School of Materials Science and Engineering Chang’an UniversityXi’an 710061China

Traditional asphalt concrete(AC)and stone matrix asphalt(SMA),which are used as thin asphalt overlays,are common maintenance strategies to enhancing ride quality,skid resistance,and ***,several studies have used a novel asphalt mixture known as a high-friction thin overlay(HFTO)to improve surface ***,it remains uncertain whether the laboratory properties of HFTO differ significantly from those of conventional *** study aims to evaluate the laboratory properties of HFTO mixtures and compare them with those of AC and *** mixtures with nominal maximum size of 9.5 mm were produced in the laboratory,and performance tests were conducted,including wheel tracking test,low temperature flexural creep test,moisture susceptibility test,Cantabro Abrasion Test,Marshall Test,sand patch test,British pendulum test,and indoor tire-rollingdown *** results showed that the HFTO exhibited a lower tire/pavement noise than the AC and ***,HFTO had superior high-temperature stability,larger macro texture,and higher skid resistance in comparison to those of AC,but lower than those of ***,HFTO mixtures may be considered a suitable replacement for traditional AC mixtures in regions where skid resistance and noise reduction are concerns.

关键词： road engineering pavement maintenance high friction thin overlay performance skid resistance tire/pavement noise

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急性脑卒中所致吞咽困难的康复治疗

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中国煤炭工业医学杂志 2009年第6期12卷 940-941页

作者：许树兰河南省新乡市第二人民医院神经内科 453002

脑卒中是造成吞咽困难的常见病因,吞咽困难与随之而来的误吸是急性脑卒中严重的并发症.吞咽困难易导致不良预后,如肺炎、脱水、营养不良等各种并发症,甚至死亡.

关键词：脑卒中吞咽困难康复治疗

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摩罗丹联合盐酸伊托必利分散片治疗慢性萎缩性胃炎的临床疗效

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现代养生 2023年第20期23卷 1545-1547页

作者：徐淑兰盛泽医院消化内科

目的分析摩罗丹联合盐酸伊托必利分散片治疗慢性萎缩性胃炎的临床疗效。方法选取江苏盛泽医院2020年3月-2022年3月期间收治的慢性萎缩性胃炎患者154例，根据组间基础资料均衡可比原则，随机数字表法分为两组，每组各77例。对照组患者... 详细信息

目的分析摩罗丹联合盐酸伊托必利分散片治疗慢性萎缩性胃炎的临床疗效。方法选取江苏盛泽医院2020年3月-2022年3月期间收治的慢性萎缩性胃炎患者154例，根据组间基础资料均衡可比原则，随机数字表法分为两组，每组各77例。对照组患者采用常规西药盐酸伊托必利分散片治疗，观察组患者在对照组基础上增加摩罗丹治疗，对比两组患者治疗后胃胀、胃痛、嗳气、纳呆及嘈杂等症状评分情况，综合比较其临床疗效。结果治疗前，两组患者胃胀、胃痛、嗳气、纳呆、嘈杂等临床症状评分差异均无统计学意义（P>0.05）;治疗后，两组患者上述临床症状评分均明显降低，并且观察组患者均低于对照组，组间差异有统计学意义（P<0.05）。观察组患者治疗6个月后总有效率（90.91%）明显高于对照组（67.53%），差异有统计学意义（P<0.05）。结论摩罗丹联合盐酸伊托必利分散片治疗慢性萎缩性胃炎能明显改善患者胃胀、胃痛、嗳气、纳呆及嘈杂等临床症状，对提高患者的预后疗效具有明显优势。

关键词：慢性萎缩性胃炎摩罗丹盐酸伊托必利分散片

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