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Cognition disturbance and allolalia were the chief clinical manifestations. The imageology showed that the impairment involved occipital lobe and temporal lobe most. 17 cases presented red-ragged-fibres and parking lot-like ultrastructure in 3 cases. Brain biopsy showed layerage structure. There were 15 of them carried mtDNA A3243G mutation. Conclusions MELAS Syndrome usually involved central nerve system and skeletal muscle.

主要临床表现为认知功能障碍及言语障碍，头颅影像学检查示枕叶、颞叶脑回受累为主。18例行肌肉病理检查显示17例存在破碎样红纤维，3例行肌肉电镜检查发现线粒体堆积呈停车场样排列，3例脑活检示病变皮层组织呈分层样改变，15例发现mtDNA A3243G点突变。

To disease resistance, SP3 (from H1) had stronger ability to resist leaf mold. 4.The characters obtained by space mutation were easier to be stable. The results showed that, the differences of the flowering dates of 1st inflorescence, the positions of 1st inflorescence, number of leaves between 1st and 2nd inflorescences in the colony were decreased with the development of generations. Most of these heritable characters could be stable in SP3 and a few could be stable in SP4, 2~3 generations earlier than that of traditional breeding (The characters were stable in 6 generations.).

试验结果表明，植株的第一花序开花期、植株的第一花序节位、第一至第二花序间隔叶数及产量的株间变异（变幅、标准差和变异系数），随着世代的递增而降低，大部分株系的变异性状从SP3后就稳定遗传，少数株系的变异性状从SP4后才稳定遗传，比一般常规育种的6个世代开始稳定，可提早2～3个世代，经地面定向选择能较快选出综合性状优良的目标株系。

In this study, relationships between mutation of p53 gene and hepatocarcinogenesis were analyzed by using LEC rat.

本研究的目的是利用LEC鼠自然发癌的模型，研究原发性肝癌p53基因的变异情况。

In our test, the mutation in S1 gene seemed notthe major reasons responsible for IBV tropism switch. 3: Relationship between HA activity and cross-species infection of IBV After treated with lecithinase C, the strains M41, H52, H120 and Gray, but notHolte, Connecticut and M52-19, could haemagglutinate 0.5% chicken erythrocytes.

唾液酸糖蛋白在IBV跨种感染过程中的作用某些冠状病毒可以利用细胞表面的唾液酸糖蛋白作为进入细胞的受体，而神经氨酸酶可以降解细胞表面的唾液酸糖蛋白，这样就会降低病毒感染的几率。

Objective:Our aim was to study the relationship between factor v Leiden mutation and Chinese Budd-Chiari syndrome.

目的：探讨国人布-加综合征与凝血第Ⅴ因子Leiden突变的相关性。

Methods The factor Ⅴ Leiden mutation was analyzed in 75 healthy and 118 ICVD patients using PCR-RFLP analysis.

应用聚合酶链反应和限制性片段长度多态性分析方法对国人 118例ICVD患者及 75名健康者进行FⅤLeiden突变检测，86例ICVD患者检测aCL ，2 7例进行抗活化蛋白C检测。

Objective To study the prevalence of FⅤ Leiden mutation and its relationship to anticardiolipin antibodies and ischemic cerebrovascular disease.

目的 探讨国人凝血因子Ⅴ外显子 10中一个固定的错义突变(FⅤLeiden突变)发生率及其与抗心磷脂抗体和缺血性脑血管病的关系。

silkworm is a model species of Lepidoptera, which genome has been sequenced, has proven to be an excellent experimental system for the study of genetics and mutation.

家蚕作为鳞翅目昆虫的模式生物，是研究遗传和变异的极好的模型。

The codon coding Leu is the site of high frequent mutation in α1- AT gene.

编码亮氨酸的密码子是突变发生的高频位点。

In contrast to FLT3/ITD mutation, point mutations were not associated with leukocytosis or low complete remission rate.

FLT3/ITD有独特的临床特征：在M3、M5亚型中比例较高；多出现于染色体核型正常和t（15；17）的AML患者；外周血白细胞高；化疗完全缓解率低。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。