建立薄膜梯度扩散(diffusive gradients in thin-films,DGT)富集-石墨炉原子吸收光谱(graphite?furnace?atomic?absorption?spectrometry,GFAAS)法测定自来水中痕量Cd(Ⅱ)的新方法。先以聚天冬氨酸溶液为结合相的DGT装置富集自来水中Cd(...建立薄膜梯度扩散(diffusive gradients in thin-films,DGT)富集-石墨炉原子吸收光谱(graphite?furnace?atomic?absorption?spectrometry,GFAAS)法测定自来水中痕量Cd(Ⅱ)的新方法。先以聚天冬氨酸溶液为结合相的DGT装置富集自来水中Cd(Ⅱ),再使用GFAAS测定DGT结合相中Cd(Ⅱ)的含量,最后依据DGT方程计算自来水中Cd(Ⅱ)质量浓度。DGT-GFAAS法测得配制水中Cd(Ⅱ)的回收率为96.2%~101.7%;测得自来水中Cd(Ⅱ)质量浓度为0.21~0.35 mg/L,加标回收率为95.4%~107.0%,相对标准偏差为3.7%~7.4%;DGT-GFAAS法对自来水中Cd(Ⅱ)的检出限为0.002 5μg/L(采样48 h),可应用于饮用水中痕量Cd(Ⅱ)的定量测量。展开更多
目的实时观测SAHA和TRAIL联合使用后对乳腺癌雌激素受体阳性细胞MCF-7生长的影响。方法实时无标记动态细胞分析系统(real time cell analysis,RTCA)动态监测各种处理因素对乳腺癌MCF-7细胞生长状况的影响并通过Biostation^(TM)活细胞工...目的实时观测SAHA和TRAIL联合使用后对乳腺癌雌激素受体阳性细胞MCF-7生长的影响。方法实时无标记动态细胞分析系统(real time cell analysis,RTCA)动态监测各种处理因素对乳腺癌MCF-7细胞生长状况的影响并通过Biostation^(TM)活细胞工作站实时收集各种处理因素对乳腺癌MCF-7细胞增殖干预的形态学证据。结果xCELLigence RTCA实时无标记动态细胞分析系统显示,随着TRAIL的加入,SAHA对MCF-7细胞的抑制作用明显增强。SAHA和TRAIL的联合用药可能提高了SAHA对MCF-7细胞的敏感性。实时活细胞工作站成像实验进一步证明SAHA和TRAIL联合用药对MCF-7乳腺癌细胞的抑制作用强于SAHA或TRAIL单独用药。结论SAHA和TRAIL的联合使用对MCF-7细胞的生长具有协同抑制作用。展开更多
2-Bromo-4-methylphenol was synthesized from 4-methylphenol by oxidative bromination at the low temperature,with a yield of 93%.The product was characterized by IR and （）1H NMR spectroscopy.The optimum conditions of ...2-Bromo-4-methylphenol was synthesized from 4-methylphenol by oxidative bromination at the low temperature,with a yield of 93%.The product was characterized by IR and （）1H NMR spectroscopy.The optimum conditions of the reaction were:reaction temperature was-5～-10℃,the mol ratio of C7H8O:H2O2 was 1:0.85,reaction time was 4h and agitation rate was 1000 r/min.展开更多
文摘目的实时观测SAHA和TRAIL联合使用后对乳腺癌雌激素受体阳性细胞MCF-7生长的影响。方法实时无标记动态细胞分析系统(real time cell analysis,RTCA)动态监测各种处理因素对乳腺癌MCF-7细胞生长状况的影响并通过Biostation^(TM)活细胞工作站实时收集各种处理因素对乳腺癌MCF-7细胞增殖干预的形态学证据。结果xCELLigence RTCA实时无标记动态细胞分析系统显示,随着TRAIL的加入,SAHA对MCF-7细胞的抑制作用明显增强。SAHA和TRAIL的联合用药可能提高了SAHA对MCF-7细胞的敏感性。实时活细胞工作站成像实验进一步证明SAHA和TRAIL联合用药对MCF-7乳腺癌细胞的抑制作用强于SAHA或TRAIL单独用药。结论SAHA和TRAIL的联合使用对MCF-7细胞的生长具有协同抑制作用。
文摘2-Bromo-4-methylphenol was synthesized from 4-methylphenol by oxidative bromination at the low temperature,with a yield of 93%.The product was characterized by IR and （）1H NMR spectroscopy.The optimum conditions of the reaction were:reaction temperature was-5～-10℃,the mol ratio of C7H8O:H2O2 was 1:0.85,reaction time was 4h and agitation rate was 1000 r/min.
