查询词典 DNA

The functions and interactions of DNA methylation regulating factors, the establishment, mantainace and removement mechanisms of DNA methylations are reviewed in this paper.

DNA转葡糖基酶有去甲基化活性从而减轻基因沉默。文章综述了以上植物DNA甲基化调控因子的生物学功能及其之间的相互作用和近年来的研究进展，以更好的理解DNA甲基化的建立、保持和去除的机制。

In this work,local ordered structures of spermidine DNA complexes prepared from different DNA concentrations have been examined by using atomic force microscopy.

观察生物体内DNA凝聚参与物—亚精胺对DNA的凝缩作用将有利于深入理解DNA在体内的紧密存储机制。

Then, a subsequential study was carried out as an application of DNA origami: molecular electronic circuit constructed by DNA origami combining with DNA metallization.

接着，本文就DNA折纸术的一个发展方向进行了更深入的研究：和DNA金属化相结合构造分子电子器件。

In the study, a set of near isogenic lines of CMS-S, S-Mo17Rf3Rf3 and S-Mo17rf3rf3, were adopted, and TdT-mediated dUTP nick-end labeling, in situ immunolocalization of cytochrome c and DNA ladder assay were employed to study the programmed cell death process on cytology and DNA level. The microscope observation evidenced that tapetal cells of fertile anthers kept intact until microspores, and then were disintegrated on later developmental stage.

S型细胞质雄性不育系的一对近等基因系S-Mo17Rf3Rf3 和S-Mo17rf3rf3为材料，采用TdT介导的dUTP DNA末端标记、细胞色素C免疫原位杂交和DNA寡聚核小体片段电泳等方法，分别在细胞学水平和DNA水平上研究了玉米CMS-S小孢子败育的细胞程序性死亡过程。

The regulation of DNA relaxation by Topo I is essential for DNA replication, transcription, and recombination events.

用来调节DNA 松懈的第一型DNA拓扑异构酶对於DNA的复制、转录和重组是不可或缺的一角。

A series PCR amplification for differential control strains and DNA samples diluted gradient (1:10) have been used to evaluate the specificity and sensitivity of PCR assay established.Results 1. Detection of GAS by PCR assay: The 345bp specific fragment of speB gene were amplified in all the tested GAS strains including three strains of scarlet fever, whereas it was detected in none of the differential control strains. The lowest limit of detection was 6.5pg genome DNA of GAS strain. 2. Detection of corynebacterium diphtheria by PCR assay: The318bp specific fragment of toxB gene were amplified in all the tested toxigenic corynebacterium diphtheria strains, whereas it was detected in none of the differential control strains. The lowest limit of detection is 850fg/μl genome DNA of corynebacterium diphtheria strain. 3. Detection of Lp by PCR assay: The 340bp specific fragments of mip gene were amplified in all the tested Lp strains, whereas it was detected in none of the differential control strains including three strains of non-pneumophila.

结果：1、用PCR方法检测A组链球菌：以A组链球菌致热性外毒素基因speB为靶序列，设计的扩增引物对全部对照菌株的扩增结果为阴性，而全部A组链球菌参考株均能扩增出特异的345bp片段，其中包括三株猩红热链球菌，检测敏感性为6.5pg／μl DNA.2、用PCR方法检测白喉杆菌：以白喉外毒素基因toxB为靶序列，设计的扩增引物对全部白喉杆菌参考株均能扩增出特异的318bp片段，而全部对照株的扩增结果为阴性，检测敏感性为850fg／μl DNA.3、用PCR方法检测嗜肺军团菌：以嗜肺军团菌巨噬细胞感染增强子基因mip为靶基因，设计的引物对嗜肺军团菌14个血清型参考株均扩增出特异的340bp片段，而鉴别对照株包括三株非嗜肺军团菌均未扩增出任何片段。

The protection of AF－1 was observed with the measurement of transudatory rate of LDH ,the breaking rate of DNA and contents of LPO and SOD,Results:The intotoxincation of glutamate was decreased by AF－1 which reduced the transudatory rate of LDH,the breaking rate of DNA and the content of LPO,and increased the content of SOD in culture significantly.

通过测定乳酸脱氢酶漏出率、DNA断裂率、超氧化物歧化酶和脂质过氧化物，观察AF－1药物的保护作用。结果：高浓度的谷氨酸可增加培养神经细胞的LDH释放率和DNA断裂率，并诱导自由基产生。AF－1明显降低谷氨酸的神经细胞毒性，使LDH释放率及DNA断裂率明显降低，LPO含量明显下降，SOD含量明显升高。

Methods The genomic DNA extracted from the 2 trematodes was amplified with random amplified polymorphic DNA and then was carried on agarose gel electrophoresis.

应用随机扩增多态性DNA（Random amplified polymorphic DNA，RAPD）技术对斯氏肺吸虫和华支睾吸虫的基因组多态DNA进行扩增，扩增产物经琼脂糖凝胶电泳后分析结果。

In order to isolar high quality DNA from Trichosanthes kirilowii Maxim leaves enriching polysaccharides and polyphenols, the effects of DNA extraction were studied with four different methods including CTAB regular method, CTAB subarea method, SDS regular method, Low pH extraction medium with high salts.

为了从富含多糖和多酚等次生代谢物质的栝楼叶片中分离出高质量的基因组DNA，以栝楼叶片为材料，对4种不同的DNA提取方法(CRAB常规法、CTAB区室法、SDS常规法、高盐低pH法)进行了试验研究，并首次采用CTAB区室法提取栝楼基因组DNA。

Methods SOS/umu assay and the ethidium bromide flurescence assay and the single cell gel electrophoresis assay were applied respectively to detect the DNA damage and DNA cross - links and DNA single strand breaks after exposure to the particle extracts of air pollutants in TSCDG.

方法应用SOS/umu试验，大鼠肺Ⅱ型细胞的DNA交联试验和单细胞凝胶电泳试验，检测危险品货运站空气污染物对DNA的损伤情况。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。