The micaceous weathered granitic soil(WGS)is frequently encountered in civil engineering worldwide,unfortunately little information is available regarding how mica affects the physico-mechanical behaviors of WGS.This ...The micaceous weathered granitic soil(WGS)is frequently encountered in civil engineering worldwide,unfortunately little information is available regarding how mica affects the physico-mechanical behaviors of WGS.This study prepares reconstituted WGS with different mica contents by removing natural mica in theWGS,and then mixes it with commercial mica powders.The geotechnical behavior as well as the microstructures of the mixtures are characterized.The addition of mica enables the physical indices of WGS to be specific combinations of coarser gradation and high permeability but high Atterberg limits.However,high mica content in WGS was found to be associated with undesirable mechanical properties,including increased compressibility,disintegration,and swelling potential,as well as poor compactability and low effective frictional angle.Microstructural analysis indicates that the influence of mica on the responses of mixtures originates from the intrinsic nature of mica as well as the particle packing being formed withinWGS.Mica exists in the mixture as stacks of plates that form a spongy structure with high compressibility and swelling potential.Pores among the plates give the soil high water retention and high Atterberg limits.Large pores are also generated by soil particles with bridging packing,which enhances the permeability and water-soil interactions upon immersion.This study provides a microlevel understanding of how mica dominates the behavior of WGS and provides new insights into the effective stabilization and improvement of micaceous soils.展开更多
目的:直接测序法及外显子3 DNA片段克隆测序定确认MICA新的等位基因MICA*002:04。方法:用组特异性引物分别扩增MICA基因,采用Sequence Base Typing(SBT)法分型技术及PCR片段克隆测序法对MICA多态性基因的外显子2、3、4、5进行双向测序...目的:直接测序法及外显子3 DNA片段克隆测序定确认MICA新的等位基因MICA*002:04。方法:用组特异性引物分别扩增MICA基因,采用Sequence Base Typing(SBT)法分型技术及PCR片段克隆测序法对MICA多态性基因的外显子2、3、4、5进行双向测序。结果:发现1个与MICA*002:01序列相近的新等位基因,在外显子3上有1个碱基位置与国际通用MICA数据库不相符。该基因与MICA*002:01相比在外显子3的碱基位置486出现突变(C→A),密码子位置20由GCC→GCA,相应编码氨基酸是同义突变。结论:DNA测序结果表明该基因序列为新的MICA等位基因,已提交GenBank,于2010年9月被世界卫生组织HLA因子命名委员会正式命名为MICA*002:04。展开更多
MICAtronics, based on the functional oxide/mica heterostructures, has recently attracted much attention due to its potential applications in transparent, flexible electronics and devices. However, the weak van der Waa...MICAtronics, based on the functional oxide/mica heterostructures, has recently attracted much attention due to its potential applications in transparent, flexible electronics and devices. However, the weak van der Waals interaction decreases the tolerable lattice mismatch and thus limits the species of function oxides that are able to be epitaxially grown on mica. We successfully fabricate relatively high-quality epitaxial anatase TiO2 thin films on mica substrates. Structural analyses reveal that the carefully chosen growth temperature(650℃) and suitable crystalline phase(anatase phase) of TiO2 are the key issues for this van der Waals epitaxy. Moreover, as a buffer layer, the TiO2 layer successfully suppresses the decomposition of BiFeO3 and the difficulty of epitaxial growth of BiFeO3 is decreased. Therefore, relatively high-quality anatase TiO2 is proved to be an effective buffer layer for fabricating more functional oxides on mica.展开更多
目的观察乳腺肿瘤细胞膜MHCⅠ链相关分子A(MHC class I chain-related gene A,MICA)及血清中可溶性MICA表达,探讨MICA在NK细胞杀伤乳腺癌中的作用。方法流式细胞术检测膜型MICA(mMICA)及NK细胞表面NKG2D表达,观察膜型MICA、可溶性MICA(s...目的观察乳腺肿瘤细胞膜MHCⅠ链相关分子A(MHC class I chain-related gene A,MICA)及血清中可溶性MICA表达,探讨MICA在NK细胞杀伤乳腺癌中的作用。方法流式细胞术检测膜型MICA(mMICA)及NK细胞表面NKG2D表达,观察膜型MICA、可溶性MICA(sMICA)对NKG2D表达的影响;免疫组织化学检测膜型MICA及可溶性MICA的表达及分布;抗体封闭法观察膜型MICA与NKG2D相互作用。结果乳腺细胞膜型MICA在正常组织不表达,在良性肿瘤表达量为(38.5±7.5)%,恶性肿瘤表达量为(53.2±5.6)%。可溶性MICA含量在健康成年人为阴性,在乳腺良性肿瘤患者血清中含量(76.8±22.3)pg/mL,在恶性肿瘤患者中含量(205.36±71.27)pg/mL。经NKG2D或MICA抗体封闭后,NK细胞的杀瘤活性显著减弱。含可溶性MICA的血清可明显下调NKG2D的表达。结论大部分乳腺肿瘤细胞膜都有MICA的表达,可作为乳腺肿瘤相关性抗原。膜型MICA与NKG2D的相互识别在介导NK细胞抗乳腺癌中起重要作用,而可溶性MICA通过下调NKG2D表达介导肿瘤免疫逃逸。展开更多
基金The financial supports of the National Natural Science Foundation of China(Grant No.42177148)the opening fund of State Key Laboratory of Geohazard Prevention and Geo-environment Protection(Grant No.SKLGP 2023K011)Postdoctoral Research Project of Guangzhou(Grant No.20220402)are gratefully thanked.
文摘The micaceous weathered granitic soil(WGS)is frequently encountered in civil engineering worldwide,unfortunately little information is available regarding how mica affects the physico-mechanical behaviors of WGS.This study prepares reconstituted WGS with different mica contents by removing natural mica in theWGS,and then mixes it with commercial mica powders.The geotechnical behavior as well as the microstructures of the mixtures are characterized.The addition of mica enables the physical indices of WGS to be specific combinations of coarser gradation and high permeability but high Atterberg limits.However,high mica content in WGS was found to be associated with undesirable mechanical properties,including increased compressibility,disintegration,and swelling potential,as well as poor compactability and low effective frictional angle.Microstructural analysis indicates that the influence of mica on the responses of mixtures originates from the intrinsic nature of mica as well as the particle packing being formed withinWGS.Mica exists in the mixture as stacks of plates that form a spongy structure with high compressibility and swelling potential.Pores among the plates give the soil high water retention and high Atterberg limits.Large pores are also generated by soil particles with bridging packing,which enhances the permeability and water-soil interactions upon immersion.This study provides a microlevel understanding of how mica dominates the behavior of WGS and provides new insights into the effective stabilization and improvement of micaceous soils.
文摘目的:直接测序法及外显子3 DNA片段克隆测序定确认MICA新的等位基因MICA*002:04。方法:用组特异性引物分别扩增MICA基因,采用Sequence Base Typing(SBT)法分型技术及PCR片段克隆测序法对MICA多态性基因的外显子2、3、4、5进行双向测序。结果:发现1个与MICA*002:01序列相近的新等位基因,在外显子3上有1个碱基位置与国际通用MICA数据库不相符。该基因与MICA*002:01相比在外显子3的碱基位置486出现突变(C→A),密码子位置20由GCC→GCA,相应编码氨基酸是同义突变。结论:DNA测序结果表明该基因序列为新的MICA等位基因,已提交GenBank,于2010年9月被世界卫生组织HLA因子命名委员会正式命名为MICA*002:04。
基金Supported by the National Key Research and Development Program of China under Grant No 2016YFA0300102the National Natural Science Foundation of China under Grant Nos 11675179,11434009 and 11374010the Fundamental Research Funds for the Central Universities under Grant No WK2340000065
文摘MICAtronics, based on the functional oxide/mica heterostructures, has recently attracted much attention due to its potential applications in transparent, flexible electronics and devices. However, the weak van der Waals interaction decreases the tolerable lattice mismatch and thus limits the species of function oxides that are able to be epitaxially grown on mica. We successfully fabricate relatively high-quality epitaxial anatase TiO2 thin films on mica substrates. Structural analyses reveal that the carefully chosen growth temperature(650℃) and suitable crystalline phase(anatase phase) of TiO2 are the key issues for this van der Waals epitaxy. Moreover, as a buffer layer, the TiO2 layer successfully suppresses the decomposition of BiFeO3 and the difficulty of epitaxial growth of BiFeO3 is decreased. Therefore, relatively high-quality anatase TiO2 is proved to be an effective buffer layer for fabricating more functional oxides on mica.
文摘目的观察乳腺肿瘤细胞膜MHCⅠ链相关分子A(MHC class I chain-related gene A,MICA)及血清中可溶性MICA表达,探讨MICA在NK细胞杀伤乳腺癌中的作用。方法流式细胞术检测膜型MICA(mMICA)及NK细胞表面NKG2D表达,观察膜型MICA、可溶性MICA(sMICA)对NKG2D表达的影响;免疫组织化学检测膜型MICA及可溶性MICA的表达及分布;抗体封闭法观察膜型MICA与NKG2D相互作用。结果乳腺细胞膜型MICA在正常组织不表达,在良性肿瘤表达量为(38.5±7.5)%,恶性肿瘤表达量为(53.2±5.6)%。可溶性MICA含量在健康成年人为阴性,在乳腺良性肿瘤患者血清中含量(76.8±22.3)pg/mL,在恶性肿瘤患者中含量(205.36±71.27)pg/mL。经NKG2D或MICA抗体封闭后,NK细胞的杀瘤活性显著减弱。含可溶性MICA的血清可明显下调NKG2D的表达。结论大部分乳腺肿瘤细胞膜都有MICA的表达,可作为乳腺肿瘤相关性抗原。膜型MICA与NKG2D的相互识别在介导NK细胞抗乳腺癌中起重要作用,而可溶性MICA通过下调NKG2D表达介导肿瘤免疫逃逸。
