查询词典 DNA

The fusion DNA fragments of ag85b-mpb64 and ag85b-mpb64-esat-6 were obtained by PCR andSOE technique. Various DNA vaccines were constructed with the pcDNA3.1: fusion of two genes, and of three genes, bivalent combinations and trivalent combinations(pCA+pCM+pCE6). BALB/c mice were vaccinated with this DNA vaccines.The mice injected withBCG were positive control and the mice injected with pCDNA3.1 and PBS were negative control.The mice were immunized 3 times with 2-wk intervals. The animals in group BCG were only inoculatedsubcutaneously with 1×10~6 CFU BCG at initial vaccination. The serum IgG titers and IgG isotype weredetermined using iELISA coated with M. bovis PPD and rMAE protein expressed and depurated inprokaryotic expression system every week.

同样，利用PCR和SOE技术，获得牛分枝杆菌mpb64-ag85b和mpb64-ag85b-esat-6融合基因，以pCDNA3.1为载体构建了牛分枝杆菌多价组合和多基因融合DNA疫苗：二基因融合(pCDNA3.1-MPB64-Ag85B，简称pCMA)和三基因融合(pCDNA3.1-MPB64-Ag85B-ESAT-6，简称pCMAE)DNA疫苗；二价组合和三价组合(pCA+pCM+pCE6)DNA疫苗，免疫BALB／c小鼠，以牛分枝杆菌BCG免疫组为阳性对照，以pCDNA3.1及PBS免疫组为阴性对照，共免疫3次，每次间隔2周，BCG组仅初免时皮下免疫1次。1免后每周，以原核表达纯化的重组MPB64-Ag85B-ESAT-6蛋白和牛分枝杆菌PPD为包被抗原，以间接ELISA方法检测血清IgG水平及lgG亚类。

This greater stability results in higher thermal melting temperature values than is observed for DNA–DNA or DNA–RNA duplexes.

这种稳定性使它的热熔化温度值比DNA-DNA 和 DNA-RNA 双链要高。

Glutinosa and Solarium lycopersicum,while Tomato yellow leaf curl China virus and its DNAβinduces distinctive vein thickening and enations as well as leaf curling.To investigate the genetic determinants of the phenotypic differences, we inoculated Nicotiana spp.with infectious clones of TbCSV/DNAβand TYLCCNV/DNAβpseudorecombinants and showed that symptoms co-segregated with the DNAβcomponent.

烟草曲茎病毒(Tobacco curly shoot virus，TbCSV)/DNAβ在烟草和番茄上能引起曲叶症状，而中国番茄黄化曲叶病毒(Tomato yellow leaf curl China virus，TYLCCNV)/DNAβ除引起曲叶外还引起寄主的脉突和耳突症状。

RESULTS The results indicated that PCF could significantly increase the viability of thymocytes and enhance the activities of SOD, GSH-Px, CAT in cells. PCF decreased the amounts of ROS and the rate of apoptosis in cells. PCF inhibited the morpholog alteration of the thymocytes irradiated by UVB and maintained the ultrastructure of cells in normal. PCF attenuated UVB caused DNA fragmentation in thymocytes. While combined ERKs inhibitor yielded typical DNA fragmentation, co-treatment of thymocytes with PCF and JNKs and p38 kinase inhibitors completely blocked UVB-induced DNA fragmentation.

结果 PCF能显著提高UVB辐射后小鼠胸腺淋巴细胞的活性；提高胞浆中SOD、GSH-px、CAT的活性，降低ROS含量及细胞凋亡率；抑制UVB辐射所致的胸腺淋巴细胞凋亡的形态学改变，维持细胞的正常超微结构；抑制UVB所致的胸腺淋巴细胞DNA片段的出现；预先应用ERK抑制剂使DNA片段增加，给予JNK和P38抑制剂后协同PCF使DNA片段带减少。

In vivo footprinting is a method of studying DNA-protein interaction. It can reflect the authentic status of DNA-protein in vivo, and can also detect the change of DNA conformation. The introduction of Ligation-Mediated PCR greatly improves the sensitivity and specificity of in vivo footprinting study, and has facilitated the executation of in vivo footprinting in the regulation of eucaryotic gene expression.

体内足迹法是一种研究DNA-蛋白质相互作用的方法，它能真实反映体内蛋白-DNA相互作用的情况，而且可以检测体内的DNA构象的变化，连接介导的聚合酶链反应(Ligation-Mediatedpolymerase chain Reaction，LM-PCR)的发明，使得体内足迹研究的敏感性和特异性大大提高，有力地促进了体内足迹技术在真核基因表达调控研究方面的应用。

This kind of configuration suits the multi-nucleotide chain's purine pyrimidine alternate area. in 1989, the American scientists with scanning tunnel electron microscope law visual observation double helix DNA double helix DNA ︰ in 1952, Austrian lineage US biology chemist Zha Qiefu (E.chargaff,1905-) have determined in DNA 4 kind of basic group content, the discovery gland fat ling and thymine quantity are equal, the bird fat ling and cytosine quantity is equal.

这种构型适合多核苷酸链的嘌呤嘧啶交替区。1989年，美国科学家用扫描隧道电镜法直接观察到双螺旋DNA 双螺旋DNA︰1952年，奥地利裔美国生物化学家查伽夫（E.chargaff，1905—）测定了DNA中4种碱基的含量，发现其中腺膘呤与胸腺嘧啶的数量相等，鸟膘呤与胞嘧啶的数量相等。

Results 371 bp DNA fragment was amplified from 24 different species. The sensitivity could be improved to 10-12 g. No signal was observed when human DNA,funguses and viruses were used as templates. 22 blood samples and 4 cerebrospinal fluid samples, being positive with culture, were positive by using PCR. The gramnegative and grampositive probes hybridized to clinic samples and different species, as predicted by Gram stain characteristics.

结果 对24株不同标准菌株进行PCR扩增，均出现371 bp长度的DNA片段，敏感性试验可检测出10-12 g的细菌DNA，与人类基因组DNA、真菌及病毒无交叉反应；22例血培养阳性标本及4例脑脊液培养阳性标本均扩增出371 bp长度DNA条带，反相杂交法区分革兰阳性/阴性细菌与培养结果相符。

In plants and animals, gene expression can be altered by changes not to DNA itself but rather chemical modifications either to DNA or to histones that interact with DNA.

在植物和动物中，基因表达能够通过非DNA自身，而是通过与DNA相互作用的DNA或组蛋白的化学修饰的变化来改变基因表达。

The interaction of two tetraaza nickel complexes in planar structures with DNA was investigated. It has been found that 〓 binds to DNA more strongly than 〓. The reason is that the open macrocycle of 〓 is more flexible to accommodate DNA with lesser obstacles.

对平面结构的镍配合物与DNA的作用机制进行了研究，发现开环结构的配合物〓比配合物〓容易使配体发生一定程度的扭曲，使之与DNA键合时所受到的空间阻力较小，因此与DNA的结合则较强。

The effects of phenolic acid compounds in vegetables and fruits on metabolicactivation of BaP in rats,as well as 〓 and TCA induced lipid peroxidation inmouse and Salmonella typhimurium TA104 cells were investigated using DNAadducts as a biomarker to assess DNA damage induced by xenobiotic carcinogens.BaP was used to study the genotoxic carcinogenesis,while 〓 and TCA were usedto study the non-genotoxic carcinogenesis.The possible protection mechanisms ofphenolic acid compounds on DNA damage were studied.

本研究根据化学致癌过程的遗传毒性和非遗传毒性机理，以DNA加合物作为机体接触外来化学物而导致DNA损伤的生物学标志物，通过观察酚酸类化合物对大鼠体内BaP活化代谢以及〓和TCA诱导小鼠肝微粒体脂质过氧化的影响，及酚酸类化合物对BaP和TCA诱导的沙门氏菌TA100和TA104形成DNA加合物的影响，探讨蔬菜、水果中酚酸类化合物对外来化学物诱导的DNA损伤的保护机制。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。