Based on Peltier effect,Bi_(2)Te_(3)-based alloy is widely used in commercial solid-state refrigeration at room temperature.The mainstream strategies for enhancing room-temperature thermoelectric performance in Bi_(2)...Based on Peltier effect,Bi_(2)Te_(3)-based alloy is widely used in commercial solid-state refrigeration at room temperature.The mainstream strategies for enhancing room-temperature thermoelectric performance in Bi_(2)Te_(3)focus on band and microstructure engineering.However,a clear understanding of the modulation of band structure and scattering through such engineering remains still challenging,because the minority carriers compensate partially the overall transport properties for the narrow-gap Bi_(2)Te_(3)at room temperature(known as the bipolar effect).The purpose of this work is to model the transport properties near and far away from the bipolar effect region for Bi_(2)Te_(3)-based thermoelectric material by a two-band model taking contributions of both majority and minority carriers into account.This is endowed by shifting the Fermi level from the conduction band to the valence band during the modeling.A large amount of data of Bi_(2)Te_(3)-based materials is collected from various studies for the comparison between experimental and predicted properties.The fundamental parameters,such as the density of states effective masses and deformation potential coefficients,of Bi_(2)Te_(3)-based materials are quantified.The analysis can help find out the impact factors(e.g.the mobility ratio between conduction and valence bands)for the improvement of thermoelectric properties for Bi_(2)Te_(3)-based alloys.This work provides a convenient tool for analyzing and predicting the transport performance even in the presence of bipolar effect,which can facilitate the development of the narrow-gap thermoelectric semiconductors.展开更多
目的基于网络药理学和体外细胞实验探究柚皮苷治疗动脉粥样硬化的作用机制。方法利用P ub Che m和Phar m m apper在线分析平台获取柚皮苷的作用靶点,在Genecards、Phar m Gkb、TTD、Disgenet和Drugbank数据库中获取动脉粥样硬化疾病相...目的基于网络药理学和体外细胞实验探究柚皮苷治疗动脉粥样硬化的作用机制。方法利用P ub Che m和Phar m m apper在线分析平台获取柚皮苷的作用靶点,在Genecards、Phar m Gkb、TTD、Disgenet和Drugbank数据库中获取动脉粥样硬化疾病相关靶点。构建蛋白质-蛋白质相互作用网络筛选核心靶点,通过基因本体(gene ontology,GO)功能分析和京都基因与基因组百科全书(Kyoto encyclopedia of genes and genomes,KEGG)富集分析筛选出主要作用靶点和相关通路,利用分子对接技术确定柚皮苷与核心靶点相互作用的分子基础。通过人脐静脉内皮细胞(human umbilical vein endothelial cells,HUVEC)进行体外实验验证相关预测结果。结果共筛选出柚皮苷潜在作用靶点220个,动脉粥样硬化疾病相关靶点5253个,共同作用靶点94个。GO功能注释共得到281个条目,其中生物学过程215个,细胞组分25个,分子功能41个;K EG G富集共得到36条与动脉粥样硬化治疗有关的通路。分子对接结果证明柚皮苷与5个核心靶点之间具有良好的结合能力。细胞实验结果表明,柚皮苷能够降低HUVEC的迁移和粘附能力。结论柚皮苷可能是通过血管内皮生长因子-2、基质金属蛋白酶-2和神经源性位点Notch同源蛋白1等关键靶点调节脂质与动脉粥样硬化、癌症蛋白多糖和MAPK等信号通路参与调节内皮细胞功能、血管生成、细胞增殖和凋亡等生物学过程发挥抗动脉粥样硬化作用。展开更多
Since I was a kid,I have dreamed of becoming a qualified soldier in the future.I want to be involved in the cause of national military,so I did not hesitate to enter the national defense class in Yuci No.2 Middle Scho...Since I was a kid,I have dreamed of becoming a qualified soldier in the future.I want to be involved in the cause of national military,so I did not hesitate to enter the national defense class in Yuci No.2 Middle School to prepare for my dream.After entering the national defense class,I have gained a lot.展开更多
基金National Natural Science Foundation of China(T2125008,92263108,92163203,52102292,52003198)Shanghai Rising-Star Program(23QA1409300)Innovation Program of Shanghai Municipal Education Commission(2021-01-07-00-07-E00096)。
文摘Based on Peltier effect,Bi_(2)Te_(3)-based alloy is widely used in commercial solid-state refrigeration at room temperature.The mainstream strategies for enhancing room-temperature thermoelectric performance in Bi_(2)Te_(3)focus on band and microstructure engineering.However,a clear understanding of the modulation of band structure and scattering through such engineering remains still challenging,because the minority carriers compensate partially the overall transport properties for the narrow-gap Bi_(2)Te_(3)at room temperature(known as the bipolar effect).The purpose of this work is to model the transport properties near and far away from the bipolar effect region for Bi_(2)Te_(3)-based thermoelectric material by a two-band model taking contributions of both majority and minority carriers into account.This is endowed by shifting the Fermi level from the conduction band to the valence band during the modeling.A large amount of data of Bi_(2)Te_(3)-based materials is collected from various studies for the comparison between experimental and predicted properties.The fundamental parameters,such as the density of states effective masses and deformation potential coefficients,of Bi_(2)Te_(3)-based materials are quantified.The analysis can help find out the impact factors(e.g.the mobility ratio between conduction and valence bands)for the improvement of thermoelectric properties for Bi_(2)Te_(3)-based alloys.This work provides a convenient tool for analyzing and predicting the transport performance even in the presence of bipolar effect,which can facilitate the development of the narrow-gap thermoelectric semiconductors.
文摘目的基于网络药理学和体外细胞实验探究柚皮苷治疗动脉粥样硬化的作用机制。方法利用P ub Che m和Phar m m apper在线分析平台获取柚皮苷的作用靶点,在Genecards、Phar m Gkb、TTD、Disgenet和Drugbank数据库中获取动脉粥样硬化疾病相关靶点。构建蛋白质-蛋白质相互作用网络筛选核心靶点,通过基因本体(gene ontology,GO)功能分析和京都基因与基因组百科全书(Kyoto encyclopedia of genes and genomes,KEGG)富集分析筛选出主要作用靶点和相关通路,利用分子对接技术确定柚皮苷与核心靶点相互作用的分子基础。通过人脐静脉内皮细胞(human umbilical vein endothelial cells,HUVEC)进行体外实验验证相关预测结果。结果共筛选出柚皮苷潜在作用靶点220个,动脉粥样硬化疾病相关靶点5253个,共同作用靶点94个。GO功能注释共得到281个条目,其中生物学过程215个,细胞组分25个,分子功能41个;K EG G富集共得到36条与动脉粥样硬化治疗有关的通路。分子对接结果证明柚皮苷与5个核心靶点之间具有良好的结合能力。细胞实验结果表明,柚皮苷能够降低HUVEC的迁移和粘附能力。结论柚皮苷可能是通过血管内皮生长因子-2、基质金属蛋白酶-2和神经源性位点Notch同源蛋白1等关键靶点调节脂质与动脉粥样硬化、癌症蛋白多糖和MAPK等信号通路参与调节内皮细胞功能、血管生成、细胞增殖和凋亡等生物学过程发挥抗动脉粥样硬化作用。
文摘Since I was a kid,I have dreamed of becoming a qualified soldier in the future.I want to be involved in the cause of national military,so I did not hesitate to enter the national defense class in Yuci No.2 Middle School to prepare for my dream.After entering the national defense class,I have gained a lot.
