The studied sample is a metallic glass in Fe-Si-B system. It is developed with the nominal composition of Fe735-Cu1-Ta3-Si13.5-B9 by single-roller melt spinning technique in air. The dielectric constant and loss facto...The studied sample is a metallic glass in Fe-Si-B system. It is developed with the nominal composition of Fe735-Cu1-Ta3-Si13.5-B9 by single-roller melt spinning technique in air. The dielectric constant and loss factor have been measured both for as cast and annealed samples using Agilent Impedance analyzer. They are found to decrease with frequency up to 10 MHz and remain constant afterwards. The decrease of dielectric constant and loss factor with frequency is due to ceasing of orientational polarizability. Their constancy is owing to presence of only electronic contribution to its polarizability above 10 MHz. Three distinct regions （1-4 MHz, 4-10 MHz and 10 MHz-1 GHz） also noticed from its frequency dependence, which might make it useful in switching and sensor devices. The temperature dependence of dielectric constant and loss factor maintain inverse relationship： （1） dielectric constant increases, and （2） loss factor decreases with annealing temperature for structural relaxation due to thermal agitation.展开更多
目的:通过检测三阴性乳腺癌(triple-negative breast cancer,TNBC)组织中肿瘤相关中性粒细胞(tumor-associated neutrophils,TANs)浸润密度及程序性死亡配体-1(PD-L1)的表达情况来分析二者的相关性,并探究其临床意义。方法:选取141例我...目的:通过检测三阴性乳腺癌(triple-negative breast cancer,TNBC)组织中肿瘤相关中性粒细胞(tumor-associated neutrophils,TANs)浸润密度及程序性死亡配体-1(PD-L1)的表达情况来分析二者的相关性,并探究其临床意义。方法:选取141例我院三阴性乳腺癌患者组织标本,使用抗体CD66b作为TANs的标记物,通过免疫组织化学法检测TNBC肿瘤组织内TANs浸润和PD-L1表达的情况。采用Pearson积差相关或Spearman等级相关分别分析TANs浸润密度和PD-L1表达与临床病理特征的相关性,以及TNBC肿瘤组织内TANs浸润密度与PD-L1阳性表达之间的相关性;采用Kaplan-Meier曲线对TNBC患者进行生存分析。结果:TANs高浸润密度与高Ki67增殖指数、高组织学分级以及淋巴结转移均呈正相关(P<0.05)。PD-L1表达与高Ki67增殖指数及高组织学分级均呈正相关(P<0.05)。TNBC中TANs的浸润密度与PD-L1阳性表达呈正相关(P<0.05)。生存分析显示,TANs浸润密度和PD-L1表达均与TNBC患者的无进展生存期呈负相关(P<0.05)。结论:TNBC肿瘤组织内TANs浸润密度和PD-L1表达与多项临床病理特征以及不良预后密切相关,这提示TANs及PD-L1可作为TNBC预后评估的重要指标,并为探索TNBC免疫治疗潜在靶点提供研究依据。展开更多
从草苁蓉75%乙醇提取物中分离得到了2个单萜苷类化合物,结合其理化性质,并通过1DNMR(1 H NMR,13 C NMR)及1 H-1 H COSY、HSQC、HMBC、NOESY等多种波谱学方法进行结构鉴定,鉴定2个化合物分别为β-D-glucopyranose 1-(3,7-dimethyl-2-tran...从草苁蓉75%乙醇提取物中分离得到了2个单萜苷类化合物,结合其理化性质,并通过1DNMR(1 H NMR,13 C NMR)及1 H-1 H COSY、HSQC、HMBC、NOESY等多种波谱学方法进行结构鉴定,鉴定2个化合物分别为β-D-glucopyranose 1-(3,7-dimethyl-2-trans-6-octa-dienoate)(化合物1)和6,7-dihydrofoliamenthoic acid diglucoside(化合物2),其中化合物1为新化合物,化合物2为第1次从列当科植物中获得.展开更多
文摘The studied sample is a metallic glass in Fe-Si-B system. It is developed with the nominal composition of Fe735-Cu1-Ta3-Si13.5-B9 by single-roller melt spinning technique in air. The dielectric constant and loss factor have been measured both for as cast and annealed samples using Agilent Impedance analyzer. They are found to decrease with frequency up to 10 MHz and remain constant afterwards. The decrease of dielectric constant and loss factor with frequency is due to ceasing of orientational polarizability. Their constancy is owing to presence of only electronic contribution to its polarizability above 10 MHz. Three distinct regions （1-4 MHz, 4-10 MHz and 10 MHz-1 GHz） also noticed from its frequency dependence, which might make it useful in switching and sensor devices. The temperature dependence of dielectric constant and loss factor maintain inverse relationship： （1） dielectric constant increases, and （2） loss factor decreases with annealing temperature for structural relaxation due to thermal agitation.
文摘目的:通过检测三阴性乳腺癌(triple-negative breast cancer,TNBC)组织中肿瘤相关中性粒细胞(tumor-associated neutrophils,TANs)浸润密度及程序性死亡配体-1(PD-L1)的表达情况来分析二者的相关性,并探究其临床意义。方法:选取141例我院三阴性乳腺癌患者组织标本,使用抗体CD66b作为TANs的标记物,通过免疫组织化学法检测TNBC肿瘤组织内TANs浸润和PD-L1表达的情况。采用Pearson积差相关或Spearman等级相关分别分析TANs浸润密度和PD-L1表达与临床病理特征的相关性,以及TNBC肿瘤组织内TANs浸润密度与PD-L1阳性表达之间的相关性;采用Kaplan-Meier曲线对TNBC患者进行生存分析。结果:TANs高浸润密度与高Ki67增殖指数、高组织学分级以及淋巴结转移均呈正相关(P<0.05)。PD-L1表达与高Ki67增殖指数及高组织学分级均呈正相关(P<0.05)。TNBC中TANs的浸润密度与PD-L1阳性表达呈正相关(P<0.05)。生存分析显示,TANs浸润密度和PD-L1表达均与TNBC患者的无进展生存期呈负相关(P<0.05)。结论:TNBC肿瘤组织内TANs浸润密度和PD-L1表达与多项临床病理特征以及不良预后密切相关,这提示TANs及PD-L1可作为TNBC预后评估的重要指标,并为探索TNBC免疫治疗潜在靶点提供研究依据。
文摘从草苁蓉75%乙醇提取物中分离得到了2个单萜苷类化合物,结合其理化性质,并通过1DNMR(1 H NMR,13 C NMR)及1 H-1 H COSY、HSQC、HMBC、NOESY等多种波谱学方法进行结构鉴定,鉴定2个化合物分别为β-D-glucopyranose 1-(3,7-dimethyl-2-trans-6-octa-dienoate)(化合物1)和6,7-dihydrofoliamenthoic acid diglucoside(化合物2),其中化合物1为新化合物,化合物2为第1次从列当科植物中获得.
