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sd region
相关语句
  sd区域
     The base elements (2base,3base,4base and 6base element) in SD sequences of Escherichia coli are analyzed and the base elements which occur with very high or very low relative frequency are listed. We find that these elements in SD region are strongly biased; The relation between the relative frequency of these elements and gene expression level are analyzed.
     统计了大肠杆菌基因中构成SD区域的碱基片段,给出了SD区域中相对使用频率高的和低的2碱基、3碱基、4碱基和6碱基片断.我们发现,构成SD序列的碱基片段有很强的偏好性;
短句来源
     the base modes of GGA category in code starting region are rare modes, but these modes are optimum in SD region.
     编码开始区域里GGA类的稀有片段恰恰是SD区域最偏好的碱基片段 ;
短句来源
     the base modes of GGA category in code-starting region are rare modes, but are predominant in SD region;
     编码开始区域里GGA类的稀有片段恰恰是SD区域最偏好的碱基片段 ;
短句来源
  “sd region”译为未确定词的双语例句
     In site -3 of coding start sequences, D1(-3) and D2(-3) have a distinct peak value for yeast and Drosophila. In the SD region of E.
     酵母和果蝇基因起始密码子上游 -3位点D1( -3)和D2( -3)有一明显峰值 ;
短句来源
     A Statistics on the Bases in SD Regionof Escherichia coli Genes
     大肠杆菌SD序列碱基片段的统计分析
短句来源
     The matrixes that form the probabilities of the bases (single base,neighbor 2 base,3 base) in SD region (in region of -1 to -25 sites before ATG codon) for E. coli DNA sequences are given. The values of M(l) reflected conservative character and correlation character are calculated.
     提出用矩阵形式表示一组核酸序列的方法.以大肠杆菌SD序列(在起始密码子ATG前-1~-25位点的25个碱基范围内)为例给出了表示各位点单碱基、相邻双碱基、相邻三碱基出现的矩阵形式,并计算了体现序列的保守性、关联性的M(l)值,发现大肠杆菌SD序列保守性,相邻双碱基、三碱基关联性与基因表达水平成正相关关系
短句来源
     coli in different expression level were investigated for SD region. The conservative and correlative properties of the bases of the specific sequences between E. coli and Yeast genes were studied comparatively, and the eigenvalues of the corresponding matrix were calculated.
     着重研究了不同表达水平的大肠杆菌(Escherichiacoli,E.coli)的SD序列(Shine -Dalgarnoregion,SD)以及大肠杆菌(E.coli)和酵母菌(Yeast)基因起始、终止密码子邻近区域核酸序列的碱基关联性与保守性。
短句来源
     Methods “Stepwise” polymerase chain reaction (PCR) was used to alter the 5′ terminal cDNA sequence of IFN α1C in three different grades of base mutation. In this way, the free energy (△G) of the secondary structure in translational initiation region(TIR) was decreased gradually. An expression plasmid (pBVE) was constructed to contain the “translational enhancer” cDNA sequence by modifying pBV220 upstream of the SD region.
     方法 采用“步移式”聚合酶链反应 (PCR) ,对IFN α1C基因 5′端核苷酸序列进行三种不同程度的碱基突变 ,使IFN α1C在pBV2 2 0载体中形成的翻译起始区域 (TIR)的二级结构自由能 (△G)逐渐降低 ,同时 ,采用PCR技术 ,将翻译增强子cDNA序列引入pBV2 2 0中的SD序列上游 ,构建一种新型载体pBVE。
短句来源
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  相似匹配句对
     SD Analysis of Postal Development for Western Region in China
     我国西部邮政发展的SD分析
短句来源
     Study of Region Road Traffic System with GIS and SD Method
     基于GIS和SD方法区域道路运输系统的研究
短句来源
     Culture Region
     文化区
短句来源
     linear region;
     在频率域内,变化过程大致可划分为三个区域:I.线性区;
短句来源
     ±SD).
     ±SD)。
短句来源
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  sd region
Eradication of the SD region in the absence of a downstream box abolished the translation activity.
      
The effect on translation of downstream box sequences optimized for binding to Mycobacterium smegmatis and Escherichia coli 16S rRNA in the absence of a Shine--Dalgarno (SD) region was investigated.
      
The spatial proximity of the IF3Cbinding site to the anti-SD region suggests a connection between them.
      
The relationship of different genes to this diagonal is then expressed as being inside or outside the 1 SD region around the diagonal.
      


he dynamics of liquid-liquid phase separation of two polymer blends ofpolystyrene/poly (vinyl methe ether) (PS/PVME ) and chlorinatedpolyethylene/ ethylene - vinyl acetate co polymer (CPE / EVA ) was studied bytime-resolved rheometrics meChanical spherometer in spinodal decomposi non (SD) regions. It was found that in the early stage of SD, the dynamicmodulus (G' ) and the dynamic viscosity (n' ) increased with time after the initiation of the isothermal phase mparation; in the intermediate...

he dynamics of liquid-liquid phase separation of two polymer blends ofpolystyrene/poly (vinyl methe ether) (PS/PVME ) and chlorinatedpolyethylene/ ethylene - vinyl acetate co polymer (CPE / EVA ) was studied bytime-resolved rheometrics meChanical spherometer in spinodal decomposi non (SD) regions. It was found that in the early stage of SD, the dynamicmodulus (G' ) and the dynamic viscosity (n' ) increased with time after the initiation of the isothermal phase mparation; in the intermediate and later stage, G'and n' decreased as the phaseseparation proceed. This behavior was analyzedand explained in the context of Dot-- Edwards model by considering the faCtors ofphase-size increasing, phase bursting and rotating under the shear motion. At thesame time, the concept of Dickie's effeCtive volume was introduce to manifest thisphenomenon. However, blends of CPE/EVA (25/75, wt/wt) andPS/PVME (90/ 10, wt/wt), the dynamic viscosity increased slightly in the latersarge, it "eds further more detailed studies.

本文从流变学角度研究了氯化聚乙烯(CPE)/、乙烯-醋酸乙烯酯(EVA)共聚物及聚苯乙烯(PS)/聚乙烯基甲基醚(PVME)两共混物不稳相分离的动力学过程.发现在相分离早期,共混物的粘度和贮能模量增加,中期及后期,两者逐渐变小.从Doi-Edwards模型出发.考虑到剪切引起的分子形变伴随的流体力学相互作用的变化及其作用下,相互的增长、破裂、旋转等因素,引入Dickie有效体积的概念,分析、解释了上述实验现象.但对PS/pvme(90/10,Wt%)HCPE/EVA(25/75,Wt%)两共混物在相分离后期,粘度有所增长的实验事实,还需深入细致的研究.

Using the self consistent information cluster method,we select 73 very high expressed genes and 100 very low expressed genes from 1 373 E.coli genes and analyze their base distribution of -1 to -21 sites before ATG codon.We find that the base distribution at -1 to -21 sites (including SD region) are correlated to the gene expresseion levels,the distance from ATG to the center of SD region (Shine-Dalgarno region) which corresponding to the position of maximum P (G) and the position of...

Using the self consistent information cluster method,we select 73 very high expressed genes and 100 very low expressed genes from 1 373 E.coli genes and analyze their base distribution of -1 to -21 sites before ATG codon.We find that the base distribution at -1 to -21 sites (including SD region) are correlated to the gene expresseion levels,the distance from ATG to the center of SD region (Shine-Dalgarno region) which corresponding to the position of maximum P (G) and the position of minimum P (T) is increased from 8 bases for very low expressed genes to 10 bases for very high expressed genes. In addition,for very high expressed genes,the probability of base T and base C in site -1 are different from very low expressed genes.

依据基因表达水平的理论预测方法从1373个大肠杆菌基因中选出了73个甚高表达基因和100个甚低表达基因.研究了这两类基因编码区起始密码子ATG前-1到-21位点(包含SD序列)的碱基构成与基因表达水平的关系.结果表明,SD序列中的富嘌呤区(约在-7到-12位点)G和T的概率分布曲线中心到ATG的距离(记为LH)与基因表达水平有明显的关系.甚高表达基因LH约为10,甚低表达基因的LH约为8;另外在-1位点处,高低表达基因的T或C出现的概率有明显的差异

The base elements (2base,3base,4base and 6base element) in SD sequences of Escherichia coli are analyzed and the base elements which occur with very high or very low relative frequency are listed.We find that these elements in SD region are strongly biased;The relation between the relative frequency of these elements and gene expression level are analyzed.We find that the frequencies of some elements ae proportional to gene expression level and others are inversely proportional to gene expression...

The base elements (2base,3base,4base and 6base element) in SD sequences of Escherichia coli are analyzed and the base elements which occur with very high or very low relative frequency are listed.We find that these elements in SD region are strongly biased;The relation between the relative frequency of these elements and gene expression level are analyzed.We find that the frequencies of some elements ae proportional to gene expression level and others are inversely proportional to gene expression level.This shows that SD sequences of E.coli correlate with the gene expression.

统计了大肠杆菌基因中构成SD区域的碱基片段,给出了SD区域中相对使用频率高的和低的2碱基、3碱基、4碱基和6碱基片断.我们发现,构成SD序列的碱基片段有很强的偏好性;另外我们还研究了这几类碱基片段与基因表达水平的关系,发现碱基片段出现的相对频率有些与基因表达水平成正比,有些与基因表达水平成反比,还有一些与基因表达水平无关,这说明SD区域与基因的表达水平是有关系的

 
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