目的使用饮食诱导肥胖(DIO)大鼠模型,探索间歇性缺氧-复氧(IHR)对肥胖大鼠体质量、食水摄入量、循环代谢因子和中枢瘦素注射反应的影响。方法通过12周高脂饮食(HFD)喂养建立DIO大鼠模型,将其随机分为3组并继续HFD喂养:常氧组(NM,n=15)...目的使用饮食诱导肥胖(DIO)大鼠模型,探索间歇性缺氧-复氧(IHR)对肥胖大鼠体质量、食水摄入量、循环代谢因子和中枢瘦素注射反应的影响。方法通过12周高脂饮食(HFD)喂养建立DIO大鼠模型,将其随机分为3组并继续HFD喂养:常氧组(NM,n=15)、间歇性缺氧组(IH:6%O2,30周期/h,8 h/d,4周,n=15),IHR组(缺氧2周后复氧2周,n=15)。记录大鼠体质量、饮食饮水情况,检测循环瘦素、IL-6、Ang-II含量。IHR干预结束后,大鼠接受4μg瘦素侧脑室注射,1 h后处死取材下丘脑及肝脏。通过免疫组化观察下丘脑POMC、FRA-1、FRA-2表达,Western blotting检测下丘脑POMC、pSTAT3、LepR表达,RT-PCR检测下丘脑和肝脏中LepR mRNA含量,对比各组大鼠下丘脑瘦素受体(LepR)及下游通路蛋白的变化。结果IH暴露导致DIO大鼠体质量(P=0.001)和摄食量(P=0.001)增加,全身炎症因子升高(瘦素P=0.004;IL-6 P=0.008;Ang-II P<0.001)。IH抑制下丘脑食欲抑制肽POMC表达(P<0.001 vs NM组),降低反映瘦素反应性神经元活性的FRA-1表达(P<0.001 vs NM组),抑制对瘦素响应的pSTAT3表达(瘦素+vs瘦素-,P=0.241),降低对外源性瘦素给药的反应性(P<0.001 vs NM组),并下调下丘脑和肝脏LepR mRNA含量(P<0.001 vs NM组)。经过2周的复氧治疗后,IH加剧的体质量增加和代谢紊乱能够得到改善,下丘脑瘦素反应性也有所提高。结论IH可能通过下调LepR表达损害下丘脑瘦素信号传导,从而促进肥胖大鼠增重,这可以通过复氧治疗得到改善。展开更多
目的:探讨新型冠状病毒感染(COVID-19)相关皮肤病学的研究现状、前沿热点及未来趋势。方法:数据取自Web of Science,检索主题:(dermatology OR dermatologist OR skin OR cutaneous OR cutis) AND (COVID-19 OR 2019-nCoV OR SARS-CoV-...目的:探讨新型冠状病毒感染(COVID-19)相关皮肤病学的研究现状、前沿热点及未来趋势。方法:数据取自Web of Science,检索主题:(dermatology OR dermatologist OR skin OR cutaneous OR cutis) AND (COVID-19 OR 2019-nCoV OR SARS-CoV-2),利用CiteSpace对数据进行分析和网络可视化制图。结果:纳入文献4 185篇,被引频次总和37 840次,平均每篇文章被引9次,涉及203位作者、198所研究机构及120个国家。其中论著2 949篇(70.5%),高频关键词涉及皮肤表现个人防护设备、压力性损伤、手卫生、病毒感染、传播、特应性皮炎、湿疹、免疫反应、重症多形红斑型药疹及皮肤肿瘤等。结论:COVID-19和皮肤病学文献计量学分析有助于了解COVID-19大流行期间皮肤病学相关研究的数据特点,其中COVID-19相关皮肤病表现、个人防护措施引起的相关皮肤问题、COVID-19预防及治疗制剂引起的皮肤疾病等是热点研究。该文的分析及总结为未来的相关研究提供一个总体的研究视角和方向。展开更多
Located on the northeast margin of the Qiangtang terrane between the Jinshajiang suture zone and Bangonghu-Nujiang suture zone,the Dongmozhazhua and Mohailaheng Pb-Zn deposits in the Yushu area of Qinghai Province are...Located on the northeast margin of the Qiangtang terrane between the Jinshajiang suture zone and Bangonghu-Nujiang suture zone,the Dongmozhazhua and Mohailaheng Pb-Zn deposits in the Yushu area of Qinghai Province are representative Pb-Zn deposits of the Pb-Zn-Cu polymetallic mineralization belt in the northern part of the Nujiang-Lancangjiang-Jinshajiang area,which are in the front belt of the Yushu thrust nappe system.The formed environments of these two deposits are different from those of sediment-hosted base metal deposits elsewhere in the world.The authors hold that they were formed during the Indian-Asian continental collision and developed within the fold-thrust belt combined with thrust and strike-slip-related Cenozoic basins in the interior of the collisional zone.Studying on the metallogenic epochs of these two deposits is helpful to the understanding of ore-forming regularity of the regional Pb-Zn-Cu mineralization belt and also to the search for new deposits in this region.The age of the Dongmozhazhua deposit has been determined by the Rb-Sr isochron method for sphalerite residues,whereas the age of the Mohailaheng deposit has been determined by the Rb-Sr isochron method for sphalerite residues and the Sm-Nd isochron method for fluorite.The age of the Dongmozhazhua deposit is 35.0-±0.0 Ma （（87Sr/86Sr）0=0.708807） for sphalerite residues.The age of the Mohailaheng deposit is 32.2±0.4 Ma （（87Sr/86Sr）o=0.708514） for sphalerite residues and 31.8±0.3 Ma （（143Nd/144Nd）o=0.512362） for fluorite with an average of 32.0 Ma.Together with the regional geological setting during mineralization,a possible tectonic model for metallogeny of the Dongmozhazhua and Mohailaheng Pb-Zn deposits has been established.These two ages are close to the ages of the Pb-Zn deposits in the Lanping and Tuotuohe basins,indicating that it is possible that the narrow 1000-kilometer-long belt controlled by a thrust nappe system on the eastern and northern margins of the Tibetan plateau could be a giant Pb-Zn mineralized belt.展开更多
采用非线性有限元法对中拱和中垂工况条件下碳纤维增强聚合物(Carbon Fiber Reinforced Polymer,CFRP)修复的浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)点蚀船体梁极限强度进行仿真分析。对比FPSO的完整船...采用非线性有限元法对中拱和中垂工况条件下碳纤维增强聚合物(Carbon Fiber Reinforced Polymer,CFRP)修复的浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)点蚀船体梁极限强度进行仿真分析。对比FPSO的完整船体梁、点蚀船体梁和CFRP修复的点蚀船体梁的中拱极限弯矩和中垂极限弯矩,分析CFRP对FPSO点蚀船体梁的修复效果,并分析胶层失效规律。结果表明,CFRP可为船舶的高效修复提供一种新的方式。展开更多
目的检测尖锐湿疣(condyloma acuminate,CA)患者血清中辅助性T淋巴细胞(helper T cell,Th细胞)相关细胞因子的表达水平,探讨其在CA发病机制中可能的作用,揭示CA患者全身的免疫状态。方法分别采集40例CA患者和20名健康对照者外周血,采用...目的检测尖锐湿疣(condyloma acuminate,CA)患者血清中辅助性T淋巴细胞(helper T cell,Th细胞)相关细胞因子的表达水平,探讨其在CA发病机制中可能的作用,揭示CA患者全身的免疫状态。方法分别采集40例CA患者和20名健康对照者外周血,采用高通量抗体芯片技术检测CA患者及健康对照者外周血血清中Th细胞相关细胞因子表达水平。结果CA患者外周血血清中Th1型细胞因子干扰素(IFN)-γ、白细胞介素(IL)-2、肿瘤坏死因子(TNF)-α表达水平分别为(5.11±3.44)pg/ml、(4.44±2.53)pg/ml、(30.16±7.38)pg/ml,较健康对照组(9.5±3.77)pg/ml、(8.26±3.26)pg/ml、(37.06±12.16)pg/ml降低;Th2型细胞因子IL-4表达水平为(4.18±2.29)pg/ml,较健康对照组(2.07±1.10)pg/ml升高;Treg型细胞因子IL-10、转化生长因子(TGF)-β表达水平分别为(2.03±1.01)pg/ml、(904.67±317.91)pg/ml,较健康对照组(1.26±0.71)pg/ml、(648.96±180.34)pg/ml升高;Th17型细胞因子IL-17及IL-23表达水平分别为(1.39±0.23)pg/ml、(172.98±42.56)pg/ml,较健康对照组(1.62±0.44)pg/ml、(204.23±48.88)pg/ml降低;以上差异均有统计学意义(均P<0.05)。结论Th1/Th2、Th17/Treg型细胞因子交互作用失衡很可能是CA重要的免疫学发病机制之一。CA患者存在全身性的细胞免疫功能紊乱。展开更多
文摘目的使用饮食诱导肥胖(DIO)大鼠模型,探索间歇性缺氧-复氧(IHR)对肥胖大鼠体质量、食水摄入量、循环代谢因子和中枢瘦素注射反应的影响。方法通过12周高脂饮食(HFD)喂养建立DIO大鼠模型,将其随机分为3组并继续HFD喂养:常氧组(NM,n=15)、间歇性缺氧组(IH:6%O2,30周期/h,8 h/d,4周,n=15),IHR组(缺氧2周后复氧2周,n=15)。记录大鼠体质量、饮食饮水情况,检测循环瘦素、IL-6、Ang-II含量。IHR干预结束后,大鼠接受4μg瘦素侧脑室注射,1 h后处死取材下丘脑及肝脏。通过免疫组化观察下丘脑POMC、FRA-1、FRA-2表达,Western blotting检测下丘脑POMC、pSTAT3、LepR表达,RT-PCR检测下丘脑和肝脏中LepR mRNA含量,对比各组大鼠下丘脑瘦素受体(LepR)及下游通路蛋白的变化。结果IH暴露导致DIO大鼠体质量(P=0.001)和摄食量(P=0.001)增加,全身炎症因子升高(瘦素P=0.004;IL-6 P=0.008;Ang-II P<0.001)。IH抑制下丘脑食欲抑制肽POMC表达(P<0.001 vs NM组),降低反映瘦素反应性神经元活性的FRA-1表达(P<0.001 vs NM组),抑制对瘦素响应的pSTAT3表达(瘦素+vs瘦素-,P=0.241),降低对外源性瘦素给药的反应性(P<0.001 vs NM组),并下调下丘脑和肝脏LepR mRNA含量(P<0.001 vs NM组)。经过2周的复氧治疗后,IH加剧的体质量增加和代谢紊乱能够得到改善,下丘脑瘦素反应性也有所提高。结论IH可能通过下调LepR表达损害下丘脑瘦素信号传导,从而促进肥胖大鼠增重,这可以通过复氧治疗得到改善。
文摘目的:探讨新型冠状病毒感染(COVID-19)相关皮肤病学的研究现状、前沿热点及未来趋势。方法:数据取自Web of Science,检索主题:(dermatology OR dermatologist OR skin OR cutaneous OR cutis) AND (COVID-19 OR 2019-nCoV OR SARS-CoV-2),利用CiteSpace对数据进行分析和网络可视化制图。结果:纳入文献4 185篇,被引频次总和37 840次,平均每篇文章被引9次,涉及203位作者、198所研究机构及120个国家。其中论著2 949篇(70.5%),高频关键词涉及皮肤表现个人防护设备、压力性损伤、手卫生、病毒感染、传播、特应性皮炎、湿疹、免疫反应、重症多形红斑型药疹及皮肤肿瘤等。结论:COVID-19和皮肤病学文献计量学分析有助于了解COVID-19大流行期间皮肤病学相关研究的数据特点,其中COVID-19相关皮肤病表现、个人防护措施引起的相关皮肤问题、COVID-19预防及治疗制剂引起的皮肤疾病等是热点研究。该文的分析及总结为未来的相关研究提供一个总体的研究视角和方向。
文摘Located on the northeast margin of the Qiangtang terrane between the Jinshajiang suture zone and Bangonghu-Nujiang suture zone,the Dongmozhazhua and Mohailaheng Pb-Zn deposits in the Yushu area of Qinghai Province are representative Pb-Zn deposits of the Pb-Zn-Cu polymetallic mineralization belt in the northern part of the Nujiang-Lancangjiang-Jinshajiang area,which are in the front belt of the Yushu thrust nappe system.The formed environments of these two deposits are different from those of sediment-hosted base metal deposits elsewhere in the world.The authors hold that they were formed during the Indian-Asian continental collision and developed within the fold-thrust belt combined with thrust and strike-slip-related Cenozoic basins in the interior of the collisional zone.Studying on the metallogenic epochs of these two deposits is helpful to the understanding of ore-forming regularity of the regional Pb-Zn-Cu mineralization belt and also to the search for new deposits in this region.The age of the Dongmozhazhua deposit has been determined by the Rb-Sr isochron method for sphalerite residues,whereas the age of the Mohailaheng deposit has been determined by the Rb-Sr isochron method for sphalerite residues and the Sm-Nd isochron method for fluorite.The age of the Dongmozhazhua deposit is 35.0-±0.0 Ma （（87Sr/86Sr）0=0.708807） for sphalerite residues.The age of the Mohailaheng deposit is 32.2±0.4 Ma （（87Sr/86Sr）o=0.708514） for sphalerite residues and 31.8±0.3 Ma （（143Nd/144Nd）o=0.512362） for fluorite with an average of 32.0 Ma.Together with the regional geological setting during mineralization,a possible tectonic model for metallogeny of the Dongmozhazhua and Mohailaheng Pb-Zn deposits has been established.These two ages are close to the ages of the Pb-Zn deposits in the Lanping and Tuotuohe basins,indicating that it is possible that the narrow 1000-kilometer-long belt controlled by a thrust nappe system on the eastern and northern margins of the Tibetan plateau could be a giant Pb-Zn mineralized belt.
文摘采用非线性有限元法对中拱和中垂工况条件下碳纤维增强聚合物(Carbon Fiber Reinforced Polymer,CFRP)修复的浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)点蚀船体梁极限强度进行仿真分析。对比FPSO的完整船体梁、点蚀船体梁和CFRP修复的点蚀船体梁的中拱极限弯矩和中垂极限弯矩,分析CFRP对FPSO点蚀船体梁的修复效果,并分析胶层失效规律。结果表明,CFRP可为船舶的高效修复提供一种新的方式。
文摘目的检测尖锐湿疣(condyloma acuminate,CA)患者血清中辅助性T淋巴细胞(helper T cell,Th细胞)相关细胞因子的表达水平,探讨其在CA发病机制中可能的作用,揭示CA患者全身的免疫状态。方法分别采集40例CA患者和20名健康对照者外周血,采用高通量抗体芯片技术检测CA患者及健康对照者外周血血清中Th细胞相关细胞因子表达水平。结果CA患者外周血血清中Th1型细胞因子干扰素(IFN)-γ、白细胞介素(IL)-2、肿瘤坏死因子(TNF)-α表达水平分别为(5.11±3.44)pg/ml、(4.44±2.53)pg/ml、(30.16±7.38)pg/ml,较健康对照组(9.5±3.77)pg/ml、(8.26±3.26)pg/ml、(37.06±12.16)pg/ml降低;Th2型细胞因子IL-4表达水平为(4.18±2.29)pg/ml,较健康对照组(2.07±1.10)pg/ml升高;Treg型细胞因子IL-10、转化生长因子(TGF)-β表达水平分别为(2.03±1.01)pg/ml、(904.67±317.91)pg/ml,较健康对照组(1.26±0.71)pg/ml、(648.96±180.34)pg/ml升高;Th17型细胞因子IL-17及IL-23表达水平分别为(1.39±0.23)pg/ml、(172.98±42.56)pg/ml,较健康对照组(1.62±0.44)pg/ml、(204.23±48.88)pg/ml降低;以上差异均有统计学意义(均P<0.05)。结论Th1/Th2、Th17/Treg型细胞因子交互作用失衡很可能是CA重要的免疫学发病机制之一。CA患者存在全身性的细胞免疫功能紊乱。
