基于RNA杂交的马铃薯纺锤块茎类病毒检测芯片

报道了一种检测植物类病毒RNA的新方法——RNA杂交芯片技术, 即将cDNA芯片技术与RNA斑点杂交技术相结合, 将马铃薯样品的总RNA直接固定在玻片上, 用荧光标记制备检测马铃薯纺锤块茎类病毒(PSTVd)的特异探针, 探针与芯片杂交后分析杂交信号以确定相应的样品有无PSTVd侵染. 参照膜杂交的方法, 确定了RNA芯片的制备条件, 并用以检测了马铃薯样品的PSTVd侵染情况, 检测结果与RT-PCR结果相符, 阳性产物经克隆测序证实为PSTVd.     

碳化硅纳米管的制备及表征

Silicon carbide nanotubes (SiCNTs) were prepared by chemical vapor deposition (CVD). Methyltrichlorosilane (MTS) was selected as the SiC gaseous source and, ferrocence and thiophene as the catalyst and the cocatalyst, respectively. The influences of pyrolysis temperature, the content of catalyst and the cocatalyst, and the mole ratio between H₂ and MTS, on the shape of the pyrolysis products were investigated, respectively. The products were characterized by SEM, EDX, XRD and HRTEM, respectively. Novel type of multi-walled SiCNTs, with 30～80 nm and 15～20 nm outer and inner diameters, respectively, were observed.     

DNA microarray synthesis by using PDMS molecular stamp (Ⅱ)——Oligonucleotide on-chip synthesis using PDMS stamp

Based on the standard phosphoramidites chemistry protocol, two oligonucleotides synthetic routes were studied by contact stamping reactants to a modified glass slide. Route A was a contact coupling reaction, in which a nucleoside monomer was transferred and coupled to reactive groups (OH) on a substrate by spreading the nucleoside activated with tetrazole on a polydimethylsiloxane (PDMS) stamp. Route B was a contact detritylation, in which one nucleoside was fixed on the desired synthesis regions where dimethoxytrityl (DMT) protecting groups on the 5'-hydroxyl of the support-bound nucleoside were removed by stamping trichloroacetic acid (TCA) distributed on features on a PDMS stamp. Experiments showed that the synthetic yield and the reaction speed of route A were higher than those of route B. It was shown that 20 mer oligonucleo-tide arrays immobilized on the glass slide were successfully synthesized using the PDMS stamps, and the coupling efficiency showed no difference between the PDMS stamping and the co     

分子印章法DNA芯片的合成──Ⅱ.接触压印反应在片合成寡核苷酸

研究了分子印章法ＤＮＡ芯片在片合成技术中的压印化学合成过程,提出了压印偶联反应和压印脱二对甲氧基三苯基阳离子（ＤＭＴ）反应合成寡核苷酸的２种方案,并对其合成产率的差异进行了比较．由于单次压印偶联反应比压印脱ＤＭＴ反应合成效率高且所需时间短,故选择压印偶联反应来合成寡核苷酸及其阵列并对其工艺进行了优化．实验表明压印偶联反应的合成效率高,从第６个核苷开始偶联效率接近１００％;压印 ２次比压印 １次的偶联效率高且更均匀;压印 ３次及３次以上除更均匀外对偶联效率的改善不明显;玻璃载片经多次压印后对偶联反应的影响不大．用压印偶联反应的方法成功合成出 ２０ ｍｅｒ的寡核苷酸探针．     

从邻苯二酚合成3,4-亚甲二氧基苯甲醇

胡椒醇;从邻苯二酚合成3;4-亚甲二氧基苯甲醇