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进化时期
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  evolution stage
     Southern hybridizationsof rice chloroplast and nuclear DNA with the two subcloned segments from pRRD9,pRRD9R and pRRD9L, revealed that psbA gene sequence was transferred from chloroplastto the nuclear genome in rice at a certain evolution stage. Significant differences occurredbetween the two segments in the ev0lution of rice variation.
     用pRRD9亚克隆片段pRRD9R和片段pRRD9L对水稻的叶绿体和核DNA进行Southern杂交分析,揭示了psbA基因同源片段在某个进化时期由叶绿体基因组转移到水稻核基因组,而且两者在水稻进化过程中的变异程度存在明显的差异。
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  “进化时期”译为未确定词的双语例句
     Results shows that immunization pressure on H3A1 sequences is not constant in different period, likelihood test results indicate that pressure increased with time, and reach the climaxafter 1995. Positive selected sites also various between clusters, 28 codons, while most of them were associated with the antibody-combining sites, were identified as positive selection site on the tree trunk in different time.
     结果表明人流感病毒H3抗原所承受的选择压力是逐渐增大的,并且在1995年后达到高峰。 在被筛选出的28个正向位点中,绝大多数都只是在流感病毒的某一段进化时期内承受着正向选择压力。
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  相似匹配句对
     On Evolution of Nature Value
     自然价值的进化
短句来源
     On the Evolution of the Spider Web
     蛛网的进化
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     Holocene is most closely related to human evolution and human civilization.
     全新世是与人类进化、人类文明形成最密切的时期
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     PLEISTOCENE DISTRIBUTIONAL AND EVOLUTIONARY HISTORY OF THE GENUS SAIGA GRAY, 1843 (MAMMALIA, ARTIODACTYLA, BOVIDAE) IN THE PALAEARCTIC
     古北区Saiga属(偶蹄目,牛科)在更新世时期的地理分布和进化历史
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     Gradual adjustment period;
     逐步调整时期
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  evolution stage
The model can be used in choosing a steel for and predicting the residual operating life of the equipment for the evolution stage of the continuous production of aromatic diamine.
      
It was the production of another stress field existing in another crustobody evolution stage and growth age.
      
The first part is the self-organizing evolution stage, which based on the mutual inhibition mechanisms of bristle differentiation and the problem's heuristic information.
      
The water environment has entered a new evolution stage in which it is intensely disturbed by the mankind's activities.
      
No natural gas pool of industrial importance could be formed at the low-evolution stage of organic matter.
      
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Early hominids have long been considered to have evolved in response to a directional shift from forested to open habitats (e.g., woodland, savanna grassland,glaciated terrain). Long-term paleoenvironmental records during the span of hominid evolution, however, contradict the idea of a simple directional trend followed by open-habitat stability. Rather, evidence from deep ocean cores, paleovegetation, and paleolakes all suggest a high degree and erratic pace of environmental fluctuation. The degree of fluctuation...

Early hominids have long been considered to have evolved in response to a directional shift from forested to open habitats (e.g., woodland, savanna grassland,glaciated terrain). Long-term paleoenvironmental records during the span of hominid evolution, however, contradict the idea of a simple directional trend followed by open-habitat stability. Rather, evidence from deep ocean cores, paleovegetation, and paleolakes all suggest a high degree and erratic pace of environmental fluctuation. The degree of fluctuation was higher during the period of hominid evolution than any earlier time during the Cenozoic. Thus adaptation to disparity, or to the conflicting demands posed by natural selection, may provide a better explanation of hominid evoluReceived April 27, 1995Submitted for the special publication commemorating the 65th Anniversary of the IVPP, Academia Sinica, China. tion than adaptation to a single directional trend or stable environment. An example from the Pleistocene of southern Kenya illustrates how species survival and change may have been affected by environmental variability.

长时期以来.早期人类进化被认为是对于从森林到开旷的栖息地(如林地、稀树草原、冰川地区)的定向变动的反应.但是人类进化时期中的长期古环境纪录却与这种简单的定向趋势加上继之而来的稳定的开旷栖息地的观念相矛盾.而深海岩芯、古植物和古湖泊的证据全都暗示着高度的和步伐不规则的环境波动.在人类进化时期的环境波动的程度比新生代的任何较早的时期为大.对自然选择提出的互相冲突的要求的适应可以提供比对简单定向趋势或稳定环境的适应更好的解释.南肯尼亚更新世的一个例子显示,环境变异可以如何影响物种的持续和变化.

Six species of pika were investigated using mitochondrial DNA (mt DNA) restriction site analysis. The phylogenetic tree was constructed using PAUP with O. erythrotis designated as an outgroup. Perhaps, the most intriguing results of this study is that the molecular tree gives us a different picture of the phylogeny compared with the former morphological studies. Previously, O. cansus and O. thibetana , shrubland burrowing species; O. curzonize and O. daurica , meadow steppe burrowing...

Six species of pika were investigated using mitochondrial DNA (mt DNA) restriction site analysis. The phylogenetic tree was constructed using PAUP with O. erythrotis designated as an outgroup. Perhaps, the most intriguing results of this study is that the molecular tree gives us a different picture of the phylogeny compared with the former morphological studies. Previously, O. cansus and O. thibetana , shrubland burrowing species; O. curzonize and O. daurica , meadow steppe burrowing species have been treated as two pairs of sibling species. Within each pair, the forms have similar morphologies and equivalent ecology. However, with the present study, each pair member is found on a different branch of the tree, which indicates that those forms came from different maternal lineages. Perhaps, the morphological similarities is caused by the convergent evolution. Divergence time, estimated from genetic distances, suggests a period of rapid radiation of genus Ochotona , perhaps during the late Pliocene. These calculations seem to correspond roughly to the tectonic events and environment changes through time, and appear to be substantiated by the fossil record.

通过对6种鼠兔限制性内切酶图谱的分析,发现传统的形态学研究公认的两对近缘物种,即高原鼠兔与达乌尔鼠兔及甘肃鼠兔与藏鼠兔实际上来自两个不同的母系群。该结果提示这4种鼠兔两两间彼此形态的相似性可能因趋同进化所致。通过遗传距离计算的各物种分化的时间表明,鼠兔在晚上新世可能有一个快速进化时期。这与在地史上发生的相应的地质事件相吻合。

Sequence comparison showed the high homology between rice repetitive DNAsequence pRRD9 and chloroplast gene psbA encoding QB protein. Southern hybridizationsof rice chloroplast and nuclear DNA with the two subcloned segments from pRRD9,pRRD9R and pRRD9L, revealed that psbA gene sequence was transferred from chloroplastto the nuclear genome in rice at a certain evolution stage. Significant differences occurredbetween the two segments in the ev0lution of rice variation. Southern analysis of wild andcultivated...

Sequence comparison showed the high homology between rice repetitive DNAsequence pRRD9 and chloroplast gene psbA encoding QB protein. Southern hybridizationsof rice chloroplast and nuclear DNA with the two subcloned segments from pRRD9,pRRD9R and pRRD9L, revealed that psbA gene sequence was transferred from chloroplastto the nuclear genome in rice at a certain evolution stage. Significant differences occurredbetween the two segments in the ev0lution of rice variation. Southern analysis of wild andcultivated rices with the segments showed that the cultivated Asian rice had closer relativeof the wild rice with AA genome type. In addition, specific hybridization patterns werealso detected in some wild rices. These findings suggest that pRRD9 may be a goodmolecular probe for the study of the evolution of rice.

序列比较说明,重复DNA顺序pRRD9与水稻叶绿体基因组中编码QB蛋白的psbA基因存在高度的同源。用pRRD9亚克隆片段pRRD9R和片段pRRD9L对水稻的叶绿体和核DNA进行Southern杂交分析,揭示了psbA基因同源片段在某个进化时期由叶绿体基因组转移到水稻核基因组,而且两者在水稻进化过程中的变异程度存在明显的差异。利用它们对野生稻和栽培稻总DNA的Southern杂交分析,显示亚洲栽培稻与AA基因组型的野生稻有较近的亲缘关系,以及在部分野生稻产生特异的杂交带谱,说明它可以作为一种分子探针来研究水稻的进化问题。

 
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