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霉酚酸脂对免疫复合物型大鼠肾炎模型的保护作用

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毒理学杂志 2016年第3期30卷 196-199,204页

作者：张丽丽张城达陈智勤陈浩陈云祥浙江省医学科学院安全性评价研究中心浙江杭州310013

目的研究霉酚酸脂(mycophenolate mofetil,MMF)对免疫复合物所致肾脏损伤的保护作用及机制。方法30只清洁级SD大鼠,雌雄各半,随机分为3组,每组10只。采用阳离子化牛血清白蛋白(C-BSA)建立免疫复合物型大鼠肾炎模型。从预免疫开始,给予MM... 详细信息

目的研究霉酚酸脂(mycophenolate mofetil,MMF)对免疫复合物所致肾脏损伤的保护作用及机制。方法30只清洁级SD大鼠,雌雄各半,随机分为3组,每组10只。采用阳离子化牛血清白蛋白(C-BSA)建立免疫复合物型大鼠肾炎模型。从预免疫开始,给予MMF 60 mg/(kg·d),连续给药8周,实验期间,观察大鼠的体重、精神状况,24 h尿蛋白测定。实验结束麻醉采血进行生化血液学检测,保留肾脏组织进行组织病理学检查,采用免疫组化方法检测肾脏组织中Ig G、C3的沉积。结果 MMF组大鼠从第4周起平均体重轻于相应时间的正常对照组大鼠平均体重(P<0.01或P<0.05),但体重减轻的程度比模型组有所降低。MMF组各个时间点的尿蛋白水平虽比正常对照组增加,但与模型组相比均显著降低(P<0.01)。与模型组比较,MMF组能显著降低CHO和BUN,升高Alb(P<0.05)。病理学检查发现MMF组可改善肾小球与肾小管的病理损伤。免疫荧光半定量分析可见模型组肾脏的Ig G、C3沉积显著高于MMF组。结论 MMF能减轻免疫复合物所致的肾脏损伤,可能与其能抑制肾脏系膜细胞及系膜基质增生有关,其机制还有待进一步研究。

关键词：霉酚酸脂免疫复合物型肾炎保护作用

Cerebral fat embolism following autologous fat injection in facial reconstruction:A case report

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World Journal of Clinical Cases 2025年第2期13卷 50-58页

作者： Xiu-Ying Chen Fa Shen Chang cheng Yu-Han Wang Wen-Chao cheng De-zhi Yuan Wen Huang Department of Neurology Chongqing Emergency Medical CenterChongqing University Central HospitalChongqing 400000China Department of Neurology Xinqiao HospitalThe Army Medical University(Third Military Medical University)Chongqing 400000China

BACKGROUND Autologous fat injection in facial reconstruction is a common cosmetic *** cerebral fat embolism(CFE)as a complication is rare,it carries serious health *** SUMMARY We present a case of a 29-year-old female patient who developed acute CFE following facial fat filling *** the surgery,the patient experienced symptoms including headache,nausea,vomiting,and difficulty breathing,which was followed by neurological symptoms such as slurred speech and left-sided *** physical examination and auxiliary investigations,including blood tests,head and neck computed tomography angiography,and cranial magnetic resonance diffusion-weighted imaging,were performed upon *** clinical diagnosis was acute cerebral embolism following facial fat filling *** included measures to improve cerebral circulation,dehydration for intracranial pressure reduction,nutritional support,and rehabilitation therapy for left limb *** patient showed a significant improvement in symptoms after 2 weeks of *** recovered left limb muscle strength to grade 5,had clear speech,and experienced complete relief of *** Our case highlights the potential occurrence of severe complications in patients undergoing fat injection in facial *** prevent these complications,plastic surgeons should enhance their professional knowledge and skills.

关键词： Cerebral fat embolism Mechanical thrombectomy Thrombolysis Steroid therapy Symptomatic treatment Case report

氮氧自由基研究 ⅩⅢ.哌啶氮氧自由基与半胱氨酸在碱性水溶液中的反应动力学和机理

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化学学报 1985年第11期43卷 1086-1091页

作者：刘有成江致勤张发兰州大学化学系兰州大学化学系兰州

哌啶氮氧自由基与半胱氨酸在碱性水溶液中反应,生成胱氨酸和相应哌啶羟胺。用紫外光谱法测得反应动力学为二级,k=0.1～1.0M-1·h-1,反应活化能Ea=68.2 kJ·mol-1,活化熵⊿S≠=-28 e.u.,反应速率受介质pH影响较小,反应可能经历环状过渡态... 详细信息

哌啶氮氧自由基与半胱氨酸在碱性水溶液中反应,生成胱氨酸和相应哌啶羟胺。用紫外光谱法测得反应动力学为二级,k=0.1～1.0M-1·h-1,反应活化能Ea=68.2 kJ·mol-1,活化熵⊿S≠=-28 e.u.,反应速率受介质pH影响较小,反应可能经历环状过渡态,并发生单电子转穆反应。准一级动力学方法进一步证明,在介质pH8.6～11.6范围内,反应活化焓和活化熵的变化符合等功力学关系,表明反应机理在所研究的pH范围内一致。 TLC和紫外光谱研究表明,哌啶氮氧自由基在碱性和中性水溶液中稳定存在,在酸性水溶液中发生自衰变反应。

关键词：氮氧自由基反应动力学哌啶碱性水溶液中性水溶液反应机理反应速率过渡态活化焓活化熵

Deciphering fungal metabolon coupling tandem inverse-electrondemand Diels-Alder reaction and semipinacol rearrangement for the biosynthesis of spiro polycyclic alkaloids

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Science China Chemistry 2025年第1期68卷 288-296页

作者： Shuai Liu Wen-Qiang Xu Ying-Tong Di Man-cheng Tang Ding-Kang Chen Ming-Ming Cao Yao-Wen Chang Hong-Yu Tang Chun-Mao Yuan Jun-Bo Yang zhi-Li Zuo Han Guo Zi-Fei Xu Ying Zeng Yun-Dong Wu Xiao-Jiang Hao Key Laboratory of Phytochemistry and Natural Medicines (Chinese Academy of Sciences) Kunming Institute of Botany Chinese Academy of Sciences University of Chinese Academy of Sciences Lab of Computational Chemistry and Drug Design State Key Laboratory of Chemical Oncogenomics Peking University Shenzhen Graduate School Shenzhen Bay Laboratory State Key Laboratory of Microbial Metabolism School of Life Sciences & Biotechnology Shanghai Jiao Tong University State Key Laboratory of Functions and Applications of Medicinal Plants Guizhou Medical University Molecular Biology Experimental Center Germplasm Bank of Wild Species in Southwest China Kunming Institute of Botany Chinese Academy of Sciences Yunnan Key Laboratory for Wild Plant Resources Kunming Institute of Botany Chinese Academy of Sciences Research Unit of Chemical Biology of Natural Anti-Virus Products Chinese Academy of Medical Sciences

In the intricate process of natural product biosynthesis, a metabolon can enhance metabolic flux by associating sequential enzymes. A fungal metabolon, comprising of flavin-dependent monooxygenase Spe F and P450 monooxygenase Spe G, is identified in the biosynthesis of spiro polycyclic alkaloids(+)-notoamide B and its diastereomer(+)-versicolamide B. Using notoamide E as a substance, Spe F/Spe G metabolon can control the stereoselectivity of its 2,3-epoxidation, followed by hydrogen atom ion at C-17 to generate reactive epoxide tau-m A with dienyl iminium unit. Subsequently,(+)-notoamide B and(+)-versicolamide B are produced via tandem nonenzymatic inverse-electron-demand Diels-Alder reaction and semipinacol rearrangement. This provides the first example of metabolon in the biosynthesis of spiro-prenylated indole alkaloids.

关键词： metabolon Diels-Alder reaction semipinacol rearrangement biosynthesis notoamides spiro polycyclic alkaloids

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掺杂对单层石墨烯纳米梁振动频率的影响

原子与分子物理学报 2025年第3期42卷 67-71页

作者：王志钦王静新疆大学物理科学与技术学院乌鲁木齐830017

石墨烯优异的力学和电学等性能,使其成为纳米机电谐振器的理想材料.通过分子动力学模拟方法研究了掺杂元素和掺杂浓度对单层石墨烯纳米梁振动特性的影响.研究结果表明,单层石墨烯纳米梁的振动频率随纳米梁长度的增加而减小,硼(B)掺杂、... 详细信息

石墨烯优异的力学和电学等性能,使其成为纳米机电谐振器的理想材料.通过分子动力学模拟方法研究了掺杂元素和掺杂浓度对单层石墨烯纳米梁振动特性的影响.研究结果表明,单层石墨烯纳米梁的振动频率随纳米梁长度的增加而减小,硼(B)掺杂、硼-硼(B-B)掺杂、铍(Be)掺杂和铍-铍(Be-Be)掺杂均会导致单层石墨烯纳米梁的振动频率降低.此外,随着硼(B)/铍(Be)掺杂浓度的增加,单层石墨烯纳米梁的振动频率逐渐降低.且随着掺杂浓度的增加,硼(B)掺杂石墨烯纳米梁的振动频率和铍(Be)掺杂石墨烯纳米梁的振动频率的差异逐渐增大.这对石墨烯纳米机械谐振器、振荡器等纳米器件的设计具有一定的理论指导意义.

关键词：石墨烯振动频率分子动力学

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Application of ionic liquids as a catalyst in the synthesis of polyvinyl butyral(PVB) polymer

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Chinese Chemical Letters 2016年第1期27卷 145-148页

作者： Xi-Xi qin zhi-Lin cheng College of Chemistry and Chemical Engineering Yangzhou University

Polyvinyl butyral（PVB） polymer was successfully synthesized using ionic liquid（IL） catalyst. The synthesis of PVB was achieved by acetalization of polyvinyl alcohol（PVA） and butyraldehyde（BA） in the presence of [HMIM]~＋HSO_4^-IL catalyst. The FT-IR,~1H NMR, DSC, GPC and SEM characterizations were used to analyze the structure and properties of PVB. The effects of the concentration of PVA in water and the number of reuse cycles on the acetalization degree were investigated. The results indicated that the maximum acetalization degree of PVB obtained using [HMIM]~＋HSO_4^-IL catalyst was up to 72%. The comparison of the commercial PVB and the PVB obtained using [HMIM]~＋HSO_4^-IL catalyst showed that the self-made PVB has a larger molecular weight, higher viscosity, and higher acetalization degree than the commercial PVB.

关键词： Ionic liquids Catalyst PVB Acetalization degree

Study on friction performance of graphene-based semi-solid grease

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Chinese Chemical Letters 2014年第9期25卷 1305-1307页

作者： zhi-Lin cheng Xi-Xi qin College of Chemistry and Chemical Engineering Yangzhou University

The graphene-based semi-solid grease with low friction coefficient was prepared by highly dispersed mixing method. The friction testing result showed that the friction coefficient of the graphene oxidebased semi-solid grease reduced from ca. 0.105 of graphite-based one to ca. 0.075, approximately 30% decreasing. Further, the graphene-based semi-solid grease shows the more outstandingly lubricating property, and the friction coefficient approximately drops to the range of between 0.04 and 0.06. By comparing with the graphite-based grease, the friction coefficient decreases about 40%-60% and the wear reduced over 50%.

关键词： Graphene Friction Wear Grease

Updating conventional soil maps by mining soil–environment relationships from individual soil polygons

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Journal of Integrative Agriculture 2019年第2期18卷 265-278页

作者： cheng Wei ZHU A-xing qin cheng-zhi QI Feng State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101P.R.China University of Chinese Academy of Sciences Beijing 100049P.R.China Key Laboratory of Virtual Geographic Environment Ministry of EducationNanjing Normal UniversityNanjing 210023P.R.China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing 210023P.R.China Department of Geography University of Wisconsin-MadisonMadison 53706USA School of Environmental and Sustainability Sciences Kean UniversityUnion 07083USA

Conventional soil maps contain valuable knowledge on soil–environment *** knowledge can be extracted for use when updating conventional soil maps with improved environmental *** methods take all polygons of the same map unit on a map as a whole to extract the soil–environment *** approach ignores the difference in the environmental conditions represented by individual soil polygons of the same map *** paper proposes a method of mining soil–environment relationships from individual soil polygons to update conventional soil *** proposed method consists of three major ***,the soil–environment relationships represented by each individual polygon on a conventional soil map are extracted in the form of frequency distribution curves for the involved environmental ***,for each environmental covariate,these frequency distribution curves from individual polygons of the same soil map unit are synthesized to form the overall soil–environment relationship for that soil map unit across the mapped *** lastly,the extracted soil–environment relationships are applied to updating the conventional soil map with new,improved environmental data by adopting a soil land inference model(SoLIM)*** study applied the proposed method to updating a conventional soil map of the Raffelson watershed in La Crosse County,Wisconsin,United *** result from the proposed method was compared with that from the previous method of taking all polygons within the same soil map unit on a map as a *** results with independent soil samples showed that the proposed method exhibited better performance and produced higher accuracy.

关键词： update conventional soil map soil–environment relationships knowledge extraction individual soil polygons

Primary parenchymal squamous cell carcinoma of the kidney:A case report

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World Journal of Clinical Cases 2025年第4期13卷 34-40页

作者： zhi-Hui Zheng Bo Shao Chao-Min Xu Ke Wang Jia-Zhu Wen Li-Kang Luo Jia-cheng Guan Department of Ultrasound The Second People’s Hospital of QuzhouQuzhou 324000Zhejiang ProvinceChina Department of Radiology Shulan(Quzhou)HospitalQuzhou 324000Zhejiang ProvinceChina Department of Radiology The Second People’s Hospital of QuzhouQuzhou 324000Zhejiang ProvinceChina Department of Pathology The Second people’s Hospital of QuzhouQuzhou 324000Zhejiang ProvinceChina

BACKGROUND Primary squamous cell carcinoma(SCC)of the renal parenchyma is extremely rare,with only nine cases *** SUMMARY This study reports a 51-year-old man with primary SCC of the renal *** patient was admitted with recurrent dull pain and discomfort in the right lumbar region,which had worsened over 2 weeks,accompanied by painful gross *** antigen(SCCA)levels were elevated,and imaging revealed a renal mass with associated *** patient underwent laparoscopic unilateral nephrectomy and lymph node *** pathology confirmed highly differentiated SCC with necrosis in the right renal parenchyma,with negative renal pelvis and *** pathological stage was *** months after surgery,the tumor recurred with involvement of the liver,right psoas major muscle,and inferior vena *** patient refused chemotherapy and succumbed to the disease 6 months postoperatively due to disease *** We report a case of primary SCC of the renal parenchyma,a rare renal *** clinical symptoms,laboratory tests,and imaging findings are nonspecific,making accurate and timely diagnosis *** to the literature,for patients with renal calculi accompanied by a renal mass,elevated serum SCCA levels,and magnetic resonance imaging showing cystic or cystic-solid masses within the kidney with pseudocapsules and heterogeneous mild enhancement,the possibility of this disease should be considered.

关键词： Renal tumor Renal parenchyma Squamous cell carcinoma Renal calculi Computed tomography Case report