查询词典 DNA

Fractal is a subdiscipline of nonlinear area, researches on fractal characteristics of the deoxyribonucleic acid sequence may reveal some secret hidden in the DNA sequence during the process of biological evolution. Chaos Game Representation was proposed as a scale-independent representation for genomic sequences by Jeffrey in 1990. This technique, based on iteration function system, represents the word distribution statistics in DNA sequence as the fractal graphic. Therefore, we can get the distribution of sequence through analysis of fractal theory.

分形是非线性领域的一门分支学科，关于脱氧核糖核酸序列分形特征的研究，可以揭示生物在进化过程中隐藏在DNA序列中的某些秘密。1990年Jeffrey提出了基因组序列的与尺度无关的混沌游戏表示法，这是基于迭代函数系统的一种方法，它将DNA序列中一定长度字的分布规律表现为图形的分形特征，进而通过分形分析就可获取序列的分布规律，从而也成为DNA序列分析的一种统计方法。

Results The positive rate of HBV DNA was the highest in patients with chronic hepatitis or symptomless HBV carriers,it was significant higher than that in patients with cirrhosis and acute hepatitis;the highest rate of HBV DNA was present in patients wit...

结果 各病型 HBV DNA阳性率以慢性肝炎和无症状携带者最高，与急性肝炎肝硬变组比较差异显著；HBe Ag阳性病例中 HBV DNA阳性率以无症状携带者、急性肝炎、慢性肝炎组最高，与慢性肝炎、肝硬变组比较差异显著；在抗-HBe阳性病例中，HBV DNA阳性率以慢性肝炎、肝硬变组为高，与急肝、无症状携带者比较差异非常显著。

DNA fingerprinting for Taraxacum mongolicum and its adulterants of six species of Compositae was demonstrated with random primed polymerase chain reaction including arbitrarily primed PCR and random amplified polymorphic DNA.

采用分子生物技术包括任意引物聚合酶链式反应和随意引物扩增的多态性DNA方法扩增蒲公英及其6种土公英混淆品的基因组DNA，获得清晰可靠的DNA指纹图谱。

The results show that the DNA extraction method based on Sambrooks method is relatively simple and easy to obtain high quality genomic DNA from freshwater unionid species.

结果表明，基于Sambrook的方法改进的DNA提取方法不仅步骤简单，而且提取的基因组DNA分子大、质量高，适合淡水蚌类基因组DNA的大规模提取。

The results show that the DNA extraction method based on Sambrook's method is relatively simple and easy to obtain high quality genomic DNA from freshwater unionid species.

结果表明，基于Sambrook的方法改进的DNA提取方法不仅步骤简单，而且提取的基因组DNA分子大、质量高，适合淡水蚌类基因组DNA的大规模提取。

But Robert Sweet, the presiding judge, disagreed, at least as far as the BRCA genes are concerned. After weighing up Myriad's arguments, he ruled:"It is concluded that DNA's existence in an 'isolated' form alters neither this fundamental quality of DNA as it exists in the body nor the information it encodes. Therefore, the patents at issues directed to 'isolated DNA' containing sequences found in nature are unsustainable as a matter of law and are deemed unpatentable subject matter."

但首席法官Robert Sweet的答案却是"否"，至少是在考虑BRCA基因一案后给出了这个答案，仔细掂量了Myraid公司的陈词后，他裁定说"我们得出结论：DNA结构是'脱离个体'的存在物，它既不能在人体内改变其基本特征，也不能改变它所编码的信息，因此，这个正在审议中的专利所指的"脱离个体，独立的DNA"，它包含序列信息，是在大自然中所发现的，把它当作一个法律问题来看是不成立的，应当作为一个不可申请专利的条目"。

The method is to use glutamate with certain concentration to induce DNA injury of PC12 cell line and observe the effect of agmatine on DNA fragment and mitochondrial function simultaneously.

在用一定浓度的谷氨酸诱导PC12细胞DNA断裂的同时，观察胍基丁胺对其DNA断裂和线粒体功能的影响，发现胍基丁胺能明显减轻谷氨酸诱导PC12细胞DNA断裂并能改善线粒体功能。

Four adduct compounds are found for the former, and three are found for the latter. This indicates the DNA adduct formation capabilities both of 2-chloro benzamide and the photoproduct sample. Meanwhile the result of Ames experiments of them is positive. Thus we should pay more attention to important meaning of these results since the compound, which can produce adducts with DNA, may possibly be tumorigen or even carcinogen and mutagen.

结果表明，前者与DNA反应形成四个可辨认的加合物斑点，后者与DNA反应形成三个可辨认的加合物斑点，能与DNA加合的物质为潜在的&三致&物质，同时，二者的Ames试验结果显阳性这应当引起人们对灭幼脲环境安全性的重视。

The quantitive value of DNA was 1.82% and 1.92% respectively in nonembryonic cells and the embryonic; during bicellular stage, quadracellular stage and multicellular stage, content of DNA increase slowly, and reach the peak at pear-shap ed embryonic stage keep high level at mature embryonic stage.

非胚性细胞与胚性细胞期的量化值分别为1.82%和1.91%；在二细胞胚、四细胞胚、多细胞胚时期DNA缓慢增长，随着胚性愈伤组织的发育，DNA的含量在梨形胚时期达到高峰；成熟胚的DNA含量虽有所下降，但仍维持较高水平。

The quantitive value of DNA was 1.82%and 1.92%respectively in nonembryonic cells and the embryonic; during bicellular stage, quadracellular stage and multicellular stage, content of DNA increase slowly, and reach the peak at pear-shaped embryonic stage keep high level at mature embryonic stage.

非胚性细胞与胚性细胞期的量化值分别为1.82%和1.91%；在二细胞胚、四细胞胚、多细胞胚时期DNA缓慢增长，随着胚性愈伤组织的发育，DNA的含量在梨形胚时期达到高峰；成熟胚的DNA含量虽有所下降，但仍维持较高水平。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。