Affected by climate warming and anthropogenic disturbances, the thermo-mechanical stability of warm and ice-rich frozen ground along the Qinghai-Tibet engineering corridor(QTEC) is continuously decreased, which may de...Affected by climate warming and anthropogenic disturbances, the thermo-mechanical stability of warm and ice-rich frozen ground along the Qinghai-Tibet engineering corridor(QTEC) is continuously decreased, which may delay the construction of major projects in the future. In this study, based on chemical stabilization of warm and icerich frozen ground, the soil-cement column(SCC) for ground improvement was recommended to reinforce the foundations in warm and ice-rich permafrost regions. To explore the validity of countermeasures mentioned above, both the original foundation and the composite foundation consisting of SCC with soil temperature of -1.0℃ were prepared in the laboratory, and then the plate loading tests were carried out. The laboratory investigations indicated that the bearing capacity of composite foundation consisting of SCC was higher than that of original foundation, and the total deformation of original foundation was greater than that of composite foundation, meaning that overall stability of foundation with warm and ice-rich frozen soil can be improved by SCC installation. Meanwhile, a numerical model considering the interface interaction between frozen soil and SCC was established for interpretating the bearing mechanism of composite foundation. The numerical investigations revealed that the SCC within composite foundation was responsible for the more applied load, and the applied load can be delivered to deeper zone in depth due to the SCC installation, which was favorable for improving the bearing characteristic of composite foundation. The investigations provide the valuable guideline for the choice of engineering supporting techniques to major projects within the QTEC.展开更多
目的:采用网络药理学方法研究肉苁蓉治疗骨质疏松的作用机制。方法:通过检索中药系统药理学分析平台(TCMSP)获取肉苁蓉的活性成分,采用反向分子对接服务器DRAR-CPI及相关数据库GeneCards、OMIM筛选肉苁蓉活性成分治疗骨质疏松的作用靶标...目的:采用网络药理学方法研究肉苁蓉治疗骨质疏松的作用机制。方法:通过检索中药系统药理学分析平台(TCMSP)获取肉苁蓉的活性成分,采用反向分子对接服务器DRAR-CPI及相关数据库GeneCards、OMIM筛选肉苁蓉活性成分治疗骨质疏松的作用靶标;采用软件Cytoscape构建肉苁蓉的"成分-靶标"网络,结合数据库String和Cytoscape绘制靶标间相互作用关系;通过服务器Systems Dock WebSite将靶标与活性成分进行分子对接评估二者间的结合活性以进行验证;最后再利用数据库DAVID对靶标基因进行基因本体分类富集分析与京都基因与基因组百科全书通路富集分析。结果:从肉苁蓉中筛选出的活性成分有13个,主要为毛蕊花糖苷、益母草碱、京尼平酸等;活性成分作用的潜在靶标有43个,主要有成骨分化特异性转录分子2(RUNX2)、血管内皮生长因子(VEGF)、白细胞介素6(IL-6)、骨生长蛋白因子(BGP)、肿瘤坏死因子(TNF)等;靶标作用涉及的信号通路有多条,主要为WNT(Wingless/Integrated)、VEGF、TNF等。结论:本研究初步探讨并验证了肉苁蓉治疗骨质疏松的主要靶标和通路,为后续进一步研究其作用机制奠定了基础。展开更多
目的采用网络药理学方法分析补肾益心片治疗高血压的作用机制,为其临床与应用提供参考。方法检索中药系统药理学数据库分析平台(TCMSP)获取补肾益心片活性成分,运用DRAR-CPI服务器、GeneCards和OMIM等数据库筛选活性成分治疗高血压的作...目的采用网络药理学方法分析补肾益心片治疗高血压的作用机制,为其临床与应用提供参考。方法检索中药系统药理学数据库分析平台(TCMSP)获取补肾益心片活性成分,运用DRAR-CPI服务器、GeneCards和OMIM等数据库筛选活性成分治疗高血压的作用靶点。采用Cytoscape3.6.0软件构建补肾益心片活性成分-高血压靶点网络。结合String数据库和Cytoscape的NetworkAnalyzer分析蛋白相互作用关系。采用Systems Dock Web Site进行活性成分与靶点分子对接。并进行GO分析、KEGG通路富集分析。结果筛选出补肾益心片活性成分30个,作用于62个靶点,主要通过调节肾素-血管紧张素系统、Toll样受体信号通路、PI3K-AKT信号通路和Jak-STAT信号通路等发挥治疗高血压的作用。结论本研究初步揭示了补肾益心片治疗高血压的多成分、多靶点作用机制,可为后续研究提供参考。展开更多
基金supported by the National Natural Science Foundation of China (No. 41471062, No. 41971085, No. 41971086)。
文摘Affected by climate warming and anthropogenic disturbances, the thermo-mechanical stability of warm and ice-rich frozen ground along the Qinghai-Tibet engineering corridor(QTEC) is continuously decreased, which may delay the construction of major projects in the future. In this study, based on chemical stabilization of warm and icerich frozen ground, the soil-cement column(SCC) for ground improvement was recommended to reinforce the foundations in warm and ice-rich permafrost regions. To explore the validity of countermeasures mentioned above, both the original foundation and the composite foundation consisting of SCC with soil temperature of -1.0℃ were prepared in the laboratory, and then the plate loading tests were carried out. The laboratory investigations indicated that the bearing capacity of composite foundation consisting of SCC was higher than that of original foundation, and the total deformation of original foundation was greater than that of composite foundation, meaning that overall stability of foundation with warm and ice-rich frozen soil can be improved by SCC installation. Meanwhile, a numerical model considering the interface interaction between frozen soil and SCC was established for interpretating the bearing mechanism of composite foundation. The numerical investigations revealed that the SCC within composite foundation was responsible for the more applied load, and the applied load can be delivered to deeper zone in depth due to the SCC installation, which was favorable for improving the bearing characteristic of composite foundation. The investigations provide the valuable guideline for the choice of engineering supporting techniques to major projects within the QTEC.
文摘目的:采用网络药理学方法研究肉苁蓉治疗骨质疏松的作用机制。方法:通过检索中药系统药理学分析平台(TCMSP)获取肉苁蓉的活性成分,采用反向分子对接服务器DRAR-CPI及相关数据库GeneCards、OMIM筛选肉苁蓉活性成分治疗骨质疏松的作用靶标;采用软件Cytoscape构建肉苁蓉的"成分-靶标"网络,结合数据库String和Cytoscape绘制靶标间相互作用关系;通过服务器Systems Dock WebSite将靶标与活性成分进行分子对接评估二者间的结合活性以进行验证;最后再利用数据库DAVID对靶标基因进行基因本体分类富集分析与京都基因与基因组百科全书通路富集分析。结果:从肉苁蓉中筛选出的活性成分有13个,主要为毛蕊花糖苷、益母草碱、京尼平酸等;活性成分作用的潜在靶标有43个,主要有成骨分化特异性转录分子2(RUNX2)、血管内皮生长因子(VEGF)、白细胞介素6(IL-6)、骨生长蛋白因子(BGP)、肿瘤坏死因子(TNF)等;靶标作用涉及的信号通路有多条,主要为WNT(Wingless/Integrated)、VEGF、TNF等。结论:本研究初步探讨并验证了肉苁蓉治疗骨质疏松的主要靶标和通路,为后续进一步研究其作用机制奠定了基础。
文摘目的采用网络药理学方法分析补肾益心片治疗高血压的作用机制,为其临床与应用提供参考。方法检索中药系统药理学数据库分析平台(TCMSP)获取补肾益心片活性成分,运用DRAR-CPI服务器、GeneCards和OMIM等数据库筛选活性成分治疗高血压的作用靶点。采用Cytoscape3.6.0软件构建补肾益心片活性成分-高血压靶点网络。结合String数据库和Cytoscape的NetworkAnalyzer分析蛋白相互作用关系。采用Systems Dock Web Site进行活性成分与靶点分子对接。并进行GO分析、KEGG通路富集分析。结果筛选出补肾益心片活性成分30个,作用于62个靶点,主要通过调节肾素-血管紧张素系统、Toll样受体信号通路、PI3K-AKT信号通路和Jak-STAT信号通路等发挥治疗高血压的作用。结论本研究初步揭示了补肾益心片治疗高血压的多成分、多靶点作用机制,可为后续研究提供参考。