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Effect of Electron Beam Irradiation on Thermal and Mechanical Properties of Polyamide Copolymer/Multiwall Carbon Nanotube Composites

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Journal of Shanghai Jiaotong university(Science) 2019年第1期24卷 12-18页

作者：崔成文陈禹廷张勇 School of Chemistry and Chemical Engineering State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong University

Ternary polyamide(tPA) copolymer is susceptible to degradation when it is irradiated by electron beam(e-beam), and effective methods to avoid degradation and increase gel content are highly desirable for crosslinking.Carboxylated multiwall carbon nanotube(MWCNT) is modified by hydroxyethyl acrylate(HEA) in this paper and used as a co-agent for the e-beam irradiation crosslinking of tPA copolymer. HEA modified MWCNT can function as an effective co-agent for the e-beam irradiation crosslinking of tPA copolymer to increase the gel content and improve the mechanical properties of tPA copolymer. Under an irradiation of 160 kGy, addition of 2 parts per hundred(phr) HEA modified MWCNT into tPA copolymer can increase the gel content of tPA copolymer from about 20% to 40%(mass ratio) and increase the tensile strength from 45 to 59 MPa. The irradiation also affects the glass transition temperature of tPA copolymer by increasing the gel content. The results show that HEA modified MWCNT can act as a nucleating agent to increase the crystallization temperature, melting temperature and crystallinity of tPA copolymer.

关键词： electron beam(e-beam) irradiation ternary polyamide(tPA) copolymer multiwall carbon nanotube(MWCNT) mechanical properties thermal properties

基于Bi_(1.5)Sb_(0.5)Te_(1.8)Se_(1.2)材料的光栅型紫外线吸收器

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激光与光电子学进展 2022年第5期59卷 280-287页

作者：张敬薛文瑞张晨陈宇婷李昌勇山西大学物理电子工程学院山西太原030006 山西大学激光光谱研究所量子光学与光量子器件国家重点实验室山西太原030006 山西大学极端光学协同创新中心山西太原030006

基于Bi_(1.5)Sb_(0.5)Te_(1.8)Se_(1.2)材料,设计了一种光栅型紫外线吸收器。采用有限元方法,对该吸收器的吸收特性与结构参数、入射角度及工作波长的依赖关系进行了详细的分析。该吸收器的吸收机制是磁激元共振效应。通过调节结构参数... 详细信息

基于Bi_(1.5)Sb_(0.5)Te_(1.8)Se_(1.2)材料,设计了一种光栅型紫外线吸收器。采用有限元方法,对该吸收器的吸收特性与结构参数、入射角度及工作波长的依赖关系进行了详细的分析。该吸收器的吸收机制是磁激元共振效应。通过调节结构参数、入射角度及工作波长,可以调节该吸收器的吸收特性。采用优化参数条件下,在200~400 nm的波段范围内,在0~75°的入射角度范围内,吸收率可以达到80%以上。该工作为紫外线吸收器的设计、制作和在紫外检测与防护、生物传感和紫外光催化等领域的应用提供了理论基础。

关键词：吸收器光栅紫外光 Bi_(1.5)Sb_(0.5)Te_(1.8)Se_(1.2) 磁激元

低剂量阿帕替尼逆转肉瘤化疗耐药及其安全性的临床研究

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中华医学杂志 2022年第31期102卷 2435-2440页

作者：叶挺袁思越范丽冯莅雯陈雨婷陈静华中科技大学同济医学院附属协和医院肿瘤中心武汉430022

目的探索抗血管生成小分子靶向药物阿帕替尼是否能逆转晚期肉瘤的化疗耐药及安全性。方法回顾性收集2018年5月至2021年11月就诊于华中科技大学同济医学院附属协和医院肿瘤中心,化疗后进展随后接受原化疗方案联合低剂量阿帕替尼治疗的晚... 详细信息

目的探索抗血管生成小分子靶向药物阿帕替尼是否能逆转晚期肉瘤的化疗耐药及安全性。方法回顾性收集2018年5月至2021年11月就诊于华中科技大学同济医学院附属协和医院肿瘤中心,化疗后进展随后接受原化疗方案联合低剂量阿帕替尼治疗的晚期肉瘤患者的资料,评估该方案的疗效及安全性。主要观察终点为疾病无进展生存期(PFS),次要观察终点为客观缓解率(ORR)、疾病控制率(DCR)、总生存时间(OS)和不良反应(AE)。共分为骨肉瘤、软组织肉瘤和未分化小圆细胞肉瘤3组,并按联合治疗的最佳疗效、原化疗线数、原化疗最佳疗效和原化疗PFS等因素进行分层分析,以初步探索联合治疗的获益情况。结果共计30例患者被纳入本研究,其中男20例,女10例,年龄(25.6±14.7)岁。包括骨肉瘤9例,软组织肉瘤11例,未分化小圆细胞肉瘤10例。无患者达到完全缓解,8例(26.7%)患者达到部分缓解,19例(63.3%)达到疾病稳定,总体ORR为26.7%(8/30),DCR为90.0%(27/30)。总体中位PFS为4.1个月,中位OS为13.1个月。三种不同亚型的肉瘤中,骨肉瘤的ORR达到44.4%(4/9),中位PFS为4.1个月,中位OS尚未达到;未分化小圆细胞肉瘤的ORR达到40.0%(4/10),中位PFS为6.4个月,中位OS为10.9个月;软组织肉瘤无客观缓解患者,中位PFS为3.5个月,中位OS为7.3个月。获得客观缓解的患者相对于疾病稳定的患者有更好的PFS(12.8比3.8个月,P=0.015),原化疗PFS≥6个月的患者有更好的PFS获益(12.7比2.7个月,P<0.001)。但原化疗线数、原化疗最佳疗效对本联合方案的PFS均无影响。安全性方面,阿帕替尼的相关毒性均不超过2级,4级化疗相关不良反应主要为血液学毒性,其中有2例患者因粒细胞缺乏伴发热中断治疗。结论低剂量阿帕替尼逆转骨肉瘤和未分化小圆细胞肉瘤的化疗耐药有一定疗效,总体安全性可接受。

关键词：肉瘤化疗耐药阿帕替尼随访研究

CHCHD2 Thr61Ile mutation impairs F1F0-ATPase assembly in in vitro and in vivo models of Parkinson's disease

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Neural Regeneration Research 2024年第1期19卷 196-204页

作者： Xiang chen Yuwan Lin Zhiling Zhang yuting Tang Panghai Ye Wei Dai Wenlong Zhang Hanqun Liu Guoyou Peng Shuxuan Huang Jiewen Qiu Wenyuan Guo Xiaoqin Zhu Zhuohua Wu Yaoyun Kuang Pingyi Xu Miaomiao Zhou Department of Neurology The First Affiliated Hospital of Guangzhou Medical UniversityGuangzhouGuangdong ProvinceChina Department of Neurology The People’s Hospital of Guangxi Zhuang Autonomous RegionNanningGuangxi Zhuang Autonomous RegionChina School of Basic Medical Sciences Guangzhou Medical UniversityGuangzhouGuangdong ProvinceChina Department of Neurology Shanghai General HospitalShanghai Jiao Tong University School of MedicineShanghaiChina

Mitochondrial dysfunction is a significant pathological alte ration that occurs in Parkinson's disease(PD),and the Thr61lle(T61I)mutation in coiled-coil helix coiled-coil helix domain containing 2(CHCHD2),a crucial mitochondrial protein,has been reported to cause Parkinson's disease.FIFO-ATPase participates in the synthesis of cellular adenosine triphosphate(ATP)and plays a central role in mitochondrial energy metabolism.However,the specific roles of wild-type(WT)CHCHD2 and T611-mutant CHCHD2 in regulating F1FO-ATPase activity in Parkinson's disease,as well as whether CHCHD2 or CHCHD2 T61I affects mitochondrial function through regulating F1FO-ATPase activity,remain unclea r.Therefore,in this study,we expressed WT CHCHD2 and T61l-mutant CHCHD2 in an MPP^(+)-induced SH-SY5Y cell model of PD.We found that CHCHD2 protected mitochondria from developing MPP^(+)-induced dysfunction.Under normal conditions,ove rexpression of WT CHCHD2 promoted F1FO-ATPase assembly,while T61I-mutant CHCHD2 appeared to have lost the ability to regulate F1FO-ATPase assembly.In addition,mass spectrometry and immunoprecipitation showed that there was an interaction between CHCHD2 and F1FO-ATPase.Three weeks after transfection with AAV-CHCHD2 T61I,we intraperitoneally injected 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine into mice to establish an animal model of chronic Parkinson's disease and found that exogenous expression of the mutant protein worsened the behavioral deficits and dopaminergic neurodegeneration seen in this model.These findings suggest that WT CHCHD2 can alleviate mitochondrial dysfunction in PD by maintaining F1F0-ATPase structure and function.

关键词： ATP synthase(F1F0-ATPase) coiled-coil helix coiled-coil helix domain containing 2 dopaminergic neuron mitochondrial dysfunction neurodegeneration oligomycin sensitivity-conferring protein Parkinson's disease T61I mutation tyrosine hydroxylase

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罕见肥大细胞白血病两例临床分析

中国医学科学院学报 2022年第6期44卷 1117-1122页

作者：刘彦权殷悦陈玉婷杨慧唐焕文广东医科大学附属东莞第一医院血液内科东莞市环境医学重点实验室广东东莞523808 福建医科大学附属协和医院血液病研究所福州350001

肥大细胞白血病(MCL)是临床极为罕见的白血病类型,具有高度异质性,需通过骨髓常规及病理、流式免疫分型、细胞遗传学以及分子生物学检测等手段综合予以诊断及鉴别,由于MCL预后极差,目前尚无公认且明确有效的治疗方案。本文通过回顾性研... 详细信息

肥大细胞白血病(MCL)是临床极为罕见的白血病类型,具有高度异质性,需通过骨髓常规及病理、流式免疫分型、细胞遗传学以及分子生物学检测等手段综合予以诊断及鉴别,由于MCL预后极差,目前尚无公认且明确有效的治疗方案。本文通过回顾性研究2例MCL患者的临床资料,系统性分析和探讨MCL的临床特征、诊疗及预后情况,以期提高对罕见MCL的认识,并为MCL的临床诊疗及基础研究提供新的借鉴与参考。

关键词：肥大细胞白血病诊断鉴别诊断治疗预后

Atomically Dispersed Ruthenium Catalysts with Open Hollow Structure for Lithium-Oxygen Batteries

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Nano-Micro Letters 2024年第2期16卷 154-164页

作者： Xin chen Yu Zhang Chang chen Huinan Li Yuran Lin Ke Yu Caiyun Nan chen chen Beijing Advanced Innovation Center for Materials Genome Engineering Institute of Solid State ChemistryUniversity of Science and Technology BeijingBeijing 100083People’s Republic of China Engineering Research Center of Advanced Rare Earth Materials Department of ChemistryTsinghua UniversityBeijing 100084People’s Republic of China Beijing Key Laboratory of Energy Conversion and Storage Materials Institution College of ChemistryBeijing Normal UniversityBeijing 100875People’s Republic of China

Lithium–oxygen battery with ultrahigh theoretical energy density is considered a highly competitive next-generation energy storage device,but its practical application is severely hindered by issues such as difficult decomposition of discharge products at present.Here,we have developed N-doped carbon anchored atomically dispersed Ru sites cathode catalyst with open hollow structure(h-RuNC)for Lithium–oxygen battery.On one hand,the abundance of atomically dispersed Ru sites can effectively catalyze the formation and decomposition of discharge products,thereby greatly enhancing the redox kinetics.On the other hand,the open hollow structure not only enhances the mass activity of atomically dispersed Ru sites but also improves the diffusion efficiency of catalytic molecules.Therefore,the excellent activity from atomically dispersed Ru sites and the enhanced diffusion from open hollow structure respectively improve the redox kinetics and cycling stability,ultimately achieving a high-performance lithium–oxygen battery.

关键词： Atomically dispersed Open hollow structure Discharge product Lithium Oxygen battery

Advances in the application of hydrogel-based scaffolds for tendon repair

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Genes & Diseases 2024年第4期11卷 296-313页

作者： Renqiang chen Fanglin chen Kenian chen Jian Xu Department of Orthopedics The First Affiliated HospitalZhejiang University School of MedicineHangzhouZhejiang 310003China Department of Orthopedics The Fourth Affiliated Hospital of Guangxi Medical UniversityLiuzhou Guangxi 545005China

Tendon injuries often lead to joint dysfunction due to the limited self-regeneration capacity of tendons.Repairing tendons is a major challenge for surgeons and imposes a signif-icant financial burden on society.Therefore,there is an urgent need to develop effective stra-tegies for repairing injured tendons.Tendon tissue engineering using hydrogels has emerged as a promising approach that has attracted considerable interest.Hydrogels possess excellent biocompatibility and biodegradability,enabling them to create an extracellular matrix-like growth environment for cells.They can also serve as a carrier for cells or other substances to accelerate tendon repair.In the past decade,numerous studies have made significant prog-ress in the preparation of hydrogel scaffolds for tendon healing.This review aims to provide an overview of recent research on the materials of hydrogel-based scaffolds used for tendon tis-sue engineering and discusses the delivery systems based on them.

关键词： Application Hydrogel-based Repairscaffolds Review Tendon injury Tissue engineering

Photodegradation of xylene isomers:Kinetics,mechanism,secondary pollutant formation potential and health risk evaluation

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Journal of Environmental Sciences 2024年第2期136卷 658-669页

作者： Xiaoyan chen Weikun Zhu Sufen Feng Jiangyao chen Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control Guangdong Technology Research Center for Photocatalytic Technology Integration and Equipment EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and HealthSchool of Environmental Science and EngineeringGuangdong University of TechnologyGuangzhou 510006China

Photodegradation technology has been widely applied in the purification of industrial aromatic hydrocarbons.However,whether this technology efficiently removes the pollutants to prevent secondary pollution and health risk is still unclear.Here,the photodegradation processes of three xylenes were compared under designed reaction atmospheres and light sources.Xe lamp showed poor photodegradation ability toward xylenes,no matter in N_(2) or N_(2)+O_(2)system,while much higher photodegradation performance of xylenes were obtained under ultraviolet(UV)and vacuum ultraviolet(VUV)irradiation,especially in N_(2)+O_(2)+VUV system,where 97.9%of m-xylene,99.0%of o-xylene or 87.5%of p-xylene with the initial concentration of 860 mg/m^(3) was removed within 240 min.The xylenes underwent three processes of photo-isomerization,photodecomposition and photo-oxidation to produce intermediates of aromatics,alkanes and carbonyls.Among them,the photo-isomerization products showed the highest concentration percentage(e.g.,≥50%in o-xylene system),confirming that photo-isomerization reaction was the dominated photodegradation process of xylenes.Moreover,these isomerized products not only contributed about 97%and91%to the formation potential of O3(OFP)and secondary organic aerosols(SOAFP),but also displayed obvious non-carcinogenic risk,although one of photodecomposition product—benzene showed the highest occupational exposure risk.Therefore,the secondary pollution and health risks of photodegradation products of xylenes were non-ignorable,although the OFP,SOAFP and health risks of the generated products reduced at least 4.5 times in comparison with that of the degraded xylenes.The findings are helpful for the appropriate application of this technology in the purification of industrial organic waste gas.

关键词： Isomer aromatics Photodegradation Ozone formation Secondary organic aerosols Health risk

Efficacy of borneol-gypsum in skin regeneration and pain control in toxic epidermal necrolysis:A case report

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World Journal of Clinical Cases 2024年第7期12卷 1290-1295页

作者： Lu-Wei Yang Li-Juan Zhang Bin-Bin Zhou Xin-Yu Lin Yu-Ting chen Xiao-Yu Qin Hui-Ying Tian Li-Li Ma Ying Sun Lin-Di Jiang Department of Rheumatology Zhongshan Hospital(Xiamen)Fudan UniversityXiamen 361100Fujian ProvinceChina Department of Dermatology Zhongshan Hospital(Xiamen)Fudan UniversityXiamen 361100Fujian ProvinceChina Department of Ophthalmology Zhongshan Hospital(Xiamen)Fudan UniversityXiamen 361100Fujian ProvinceChina Department of Nursing Zhongshan Hospital(Xiamen)Fudan UniversityXiamen 361100Fujian ProvinceChina Department of Rheumatology Zhongshan HospitalFudan UniversityShanghai 200030China

BACKGROUND Toxic epidermal necrolysis(TEN)is a life-threatening dermatological emergency mainly induced by drug hypersensitivity reactions.Standard management includes discontinuation of culprit drug and application of immunomodulatory therapy.However,mortality remains high due to complications like septic shock and multiorgan failures.Innovative approaches for skin care are crucial.This report introduces borneol-gypsum,a traditional Chinese drug but a novel dressing serving as an adjuvant of TEN therapy,might significantly improve skin conditions and patient outcomes in TEN.CASE SUMMARY A 38-year-old woman diagnosed with eosinophilic granulomatosis with polyangiitis experienced gangrenous complications and motor nerve involvement.After initial treatment of high-dose corticosteroids and cyclophosphamide,symptom of foot drop improved,absolute eosinophil counts decreased,while limb pain sustained.Duloxetine was added to alleviate her symptom.Subsequently,TEN developed.Additional topical application of borneol-gypsum dressing not only protected the skin lesions from infection but also significantly eased localized pain.This approach demonstrated its merit in TEN management by promoting skin healing and potentially reducing infection risks.CONCLUSION Borneol-gypsum dressing is a promising adjuvant that could significantly improve TEN management,skin regeneration,and patient comfort.

关键词： Toxic epidermal necrolysis Eosinophilic granulomatosis with polyangiitis Duloxetine Borneol Gypsum Case report