质粒

The coding region of Bar gene, the left border of Ds element, the coding region of GUS gene

粒p13B，用于分离水稻基因启动子。以此质粒用农杆菌介导的方法转化粳稻品种中花11 的

When pH is below 1 0, DNA denaturalization of pEGFPC3 was prominent and there was hardly protection by β-cyclodextrin.

结果 pH 1 0的酸液对pEGFPC3质粒DNA的变性作用最强，pH 1 5～ 2 5的酸液对其有部分变性作用，pH 1 5～ 2 。5范围内β-环状糊精对质粒DNA具有较为明显的保护作用，对于pH 1 0的情况仍不足提供相应的保护。

Hairy roots were induced from tobacco leaves with Agrobacterium rhizogenes LBA1334 harboring agropin type PRil855 and binary vector PIG121HM carrying a kanamycin resistant gene nptll and GUS gene and the good hairy root clones were selected. The root with many root hairs and branches grew vigorously toward all the direction on MS medium without plant hormone and on kanamyain containing medium (km:30mg/L). The structure of the hairy root tip is different from that of ordinary root. Witch was not typical root cap maybe the main cause of losing the geotropism of hairy root. Plantlet regenerated from hairy root when cultured on Ms medium without plant hormone. The nicotine content of the hairy root was little higher than that in the natural roots.

本研究通过发根农杆菌工程菌LBA1334(含有野生型pRi1855质粒和pIG121HM双元载体质粒，编码NPTⅡ基因和GUS基因)转化烟草沙姆逊，获得了具有卡那霉素抗性烟草发状根，并筛选出良好的单克隆株系，该发状根具有典型的发状根特性(多根毛、多分支、在无激素培养基上快速生长)，通过根尖压片分析，烟草发状根不具备典型的根冠；发状根中烟碱含量1.61％稍高于与天然栽培品种母体根的含量(1.5％左右)，发状根向培养液中释放烟碱，释放量最多时占总烟碱量的81.1％；在无激素的培养基上获得了再生植株。

The blocking mechanism takes advantage of the fact that a small sequence of this CRISPR locus matches staphylococcal conjugative plasmids, including those that confer antibiotic resistance in MRSA strains.

这一位点的阻断机理是利用了以下事实：CRISPR位点上的一小段序列与金黄葡菌中包括引起抗生素抗性质粒在内的结合质粒中的序列互补。

2Ai. In addition, cell extracts from E. coli JM109(DE3) cells harbouring the recombinant plasmid pAM28 were able to decarboxylate the histidine present in the reaction to histamine, whereas extracts prepared from control cells containing the vector plasmid alone did not.

此外，从大肠杆菌细胞提取物大肠杆菌JM109中（DE3）中细胞重组质粒pAM28窝藏能够decarboxylate在本组氨酸为组胺反应，从控制细胞制备含有载体质粒提取物，而仅仅没有。

The N gene ORF was then subcloned into pET-30a vector and the recombinant plasmid was transformed into E.coli BL21 (DE3) and induced with IPTG. The protein expression was determined by SDS-PAGE. The expressed protein had a molecular weight of 54.4 Ku that existed as inclusion body. Thin-layer scanning showed that the expression product accounted for 30.5% of the total bacterial proteins. The recombinant protein possessed native biological activity and could react with anti-PEDV hyperimmune serum in Western blot.

以阳性质粒为模板，用分别含有BamH Ⅰ和Xho Ⅰ酶切位点的上、下游引物扩增得到ORF，其PCR产物经BamH Ⅰ和Xho Ⅰ双酶切后定向克隆到pET-30a载体，构建的重组质粒命名为pET-30a-PN；将pET-30a-PN转化到大肠杆菌BL21 (DF3)中，在IPTG诱导下进行表达；SDS-PAGE结果表明表达出与预期大小相符的约54.4 Ku的重组蛋白，重组蛋白以包涵体形式存在；薄层扫描结果表明表达产物占菌体总蛋白的30.5%；Western blot分析表明表达的重组蛋白能与抗PEDV高免血清反应，说明该重组蛋白具有免疫学活性。

A transposon mutagenesis system applicable for Xanthomonas campestrispv.campestrishas been developed by transferring the transposonTn5gusA5,which contains the gus reporter gene,to the broad host rangvector pLAFR1 and taking the advantage of incompatibility between pLAFR1and pPH1JI plasmids.Five different types of exopolysaccharidedeficient mutants related respectively to eight different mutated sites wereisolated by applying the system to mutagenize the Xcc wild type strain.

本研究将含gus报告基因的转座子Tn5gusA5转座到广谱宿主载体质粒pLAFR1后，利用pLAFR1与pPH1JI质粒的不相容性，建立了一套适合于甘蓝黑腐病菌的转座子诱变体系，应用该体系诱变甘蓝黑腐病菌野生型菌株，成功地分离到5种不同类型、分别涉及8个不同突变位点的胞外多糖突变体。

The BDDcFⅧ gene was ligated behind PUB and 20H1 promotors to create lentiviral vectors pTK161 and pTK162. Meantime lentiviral vectors pTK161' and pTK162' were produced by cloning a green fluorescent protein into pTK151 and pTK152, which was driven by PUB and 2OH1 promotors respectively. Vector supernatant were prepared by using transfer calcium phosphate mediated-cotransfection of 293T cells. The virus vector,△NRF packaging-plasmid, and VSV-G envelope-plasmid was assayed by titers and cFⅧ activity in cell culture supernatant after infection into 293T cells.

用构建携带cFⅧ基因的慢病毒载体pTK161和pTK162（含20HI启动子），同时构建含绿色荧光蛋白的慢病毒载体pTK161'和pTK162'（含2OH1启动子）的方法，分别与包装质粒△NRF、包膜蛋白质粒VSV-G共转染293T包装细胞，将包装好的病毒颗粒再感染293T细胞，检测病毒滴度和培养细胞上清中cFⅧ活性。

To produce large quantities of plasmid, an efficient large-scale purification process needs to be developed.

由于目前市场上对质粒的需求量很大，因此有必要开发大规模的质粒制备技术。

Results The results showed that the pDNA was completely degraded within 1 minute in 5U/μl of deoxyribonuclease solution at 37℃. While the chitosan with MW more than 200000 showed favourable protective effect on DNA.

结果 在人体温度(37℃)下，浓度5U/μl的DNase Ⅰ在1min内即可降解没有保护的质粒DNA，而相对分子质量为200000以上的壳聚糖对质粒具有良好的保护作用。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！