目的研究肝癌组织细胞样本于-80℃超低温保存条件下的质量控制,探讨肝癌组织细胞样本在超低温保存中的时效性。方法随机抽取超低温新鲜冻存(24 h内)、保存3个月、6个月和1年不同时长的肝癌和对应的癌旁组织细胞各12对,HE染色评估标本取...目的研究肝癌组织细胞样本于-80℃超低温保存条件下的质量控制,探讨肝癌组织细胞样本在超低温保存中的时效性。方法随机抽取超低温新鲜冻存(24 h内)、保存3个月、6个月和1年不同时长的肝癌和对应的癌旁组织细胞各12对,HE染色评估标本取材的准确性,采用Promega自动提取核酸仪提取肝脏细胞RNA,利用Agilent 2100生物分析仪进行RIN值及28S/18S比值分析。对新鲜冻存、保存3个月、6个月以及1年的组织细胞样本的RIN值和28S/18S比值进行组间非配对t检验。结果 HE染色镜下观察发现切片组织细胞中肿瘤细胞比例达到80﹪以上,为生物样本库的合格样本。生物分析仪检测结果显示超低温新鲜冻存、保存3个月、6个月和1年的癌和癌旁组织细胞的RIN均值均>7.0,平均28S/18S比值均>1.5,组间非配对t检验显示,保存1年的肝癌组织细胞相比于新鲜冻存(7.442±0.674 vs 8.617±0.769,P=0.001)、保存3个月(7.442±0.674 vs 8.275±0.617,P=0.005)和6个月(7.442±0.674 vs 8.175±0.970,P=0.043)的组织细胞RIN值显著下降,提示存在一定程度的RNA降解,而其余各组之间差异均无统计学意义(P均>0.05)。结论在超低温条件下新鲜冻存、保存3个月、6个月的肝癌及癌旁组织细胞,其质量均可以获得有效保证,而保存1年的肝癌组织细胞的RNA虽然存在一定程度的降解,但能够满足后续临床科研的要求。展开更多
On SrTiO3 single crystal substrate,by using the pulsed electron deposition tech-nique,the high-quality electron doped Nd1.85Ce0.15CuO4?δ superconducting film was successfully fabricated. After careful study on the R-...On SrTiO3 single crystal substrate,by using the pulsed electron deposition tech-nique,the high-quality electron doped Nd1.85Ce0.15CuO4?δ superconducting film was successfully fabricated. After careful study on the R-T curves of the obtained sam-ples deposited with different substrate temperatures,thicknesses,annealing methods and pulse frequencies,the effects of them on the superconductivity of the films were found,and the reasons were also analyzed. Additionally,by using the same model of the pulsed laser deposition technique,the relation between the target-to-substrate distance and the deposition pressure was drawn out as a quantitative one.展开更多
文摘目的研究肝癌组织细胞样本于-80℃超低温保存条件下的质量控制,探讨肝癌组织细胞样本在超低温保存中的时效性。方法随机抽取超低温新鲜冻存(24 h内)、保存3个月、6个月和1年不同时长的肝癌和对应的癌旁组织细胞各12对,HE染色评估标本取材的准确性,采用Promega自动提取核酸仪提取肝脏细胞RNA,利用Agilent 2100生物分析仪进行RIN值及28S/18S比值分析。对新鲜冻存、保存3个月、6个月以及1年的组织细胞样本的RIN值和28S/18S比值进行组间非配对t检验。结果 HE染色镜下观察发现切片组织细胞中肿瘤细胞比例达到80﹪以上,为生物样本库的合格样本。生物分析仪检测结果显示超低温新鲜冻存、保存3个月、6个月和1年的癌和癌旁组织细胞的RIN均值均>7.0,平均28S/18S比值均>1.5,组间非配对t检验显示,保存1年的肝癌组织细胞相比于新鲜冻存(7.442±0.674 vs 8.617±0.769,P=0.001)、保存3个月(7.442±0.674 vs 8.275±0.617,P=0.005)和6个月(7.442±0.674 vs 8.175±0.970,P=0.043)的组织细胞RIN值显著下降,提示存在一定程度的RNA降解,而其余各组之间差异均无统计学意义(P均>0.05)。结论在超低温条件下新鲜冻存、保存3个月、6个月的肝癌及癌旁组织细胞,其质量均可以获得有效保证,而保存1年的肝癌组织细胞的RNA虽然存在一定程度的降解,但能够满足后续临床科研的要求。
基金Supported by the Key Project of Zhejiang Provincial Natural Science Foundation(Grant No.Z605131)the‘100 Talents Project’of Chinese Academy of Sciences,the Creative Research Group of National Natural Science Foundation of China(Grant No.60321001)the National Natural Science Foundation of China(Grant No.60571029)
文摘On SrTiO3 single crystal substrate,by using the pulsed electron deposition tech-nique,the high-quality electron doped Nd1.85Ce0.15CuO4?δ superconducting film was successfully fabricated. After careful study on the R-T curves of the obtained sam-ples deposited with different substrate temperatures,thicknesses,annealing methods and pulse frequencies,the effects of them on the superconductivity of the films were found,and the reasons were also analyzed. Additionally,by using the same model of the pulsed laser deposition technique,the relation between the target-to-substrate distance and the deposition pressure was drawn out as a quantitative one.
