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isolation mechanism
相关语句
  隔离机制
     KERNEL MODULES ISOLATION MECHANISM BASED ON SEGMENTATION PROTECTION
     基于分段保护的内核模块隔离机制
短句来源
     Under multi-user environment, the parallel control and processing mechaniems in Oracle8i refer to transaction isolation mechanism, locking mechanism and lock releasing mechanism.
     在多用户环境下,Oracle8i数据库的后台并发控制与处理机制涉及事务隔离机制、封锁机制及强制锁释放等处理方法。
短句来源
     From the perspective of enterprises' resources and competence,through demonstrating the relationship between enterprise's sustained competitive advantage and causal ambiguity,the article puts forward that the casual ambiguity in unique resources,tacit knowledge,core competence,the process of decision-making and social capital makes the success enterprises hard to imitate,and then take them a hard isolation mechanism and sustained competitive advantages.
     本文从企业资源和企业能力的角度,通过阐释企业持续竞争优势与因果模糊之间的关系,认为正是由于独特性资源、核心竞争力、默认知识、决策过程和企业社会资本所具有的因果模糊,使成功的企业难以被模仿,进而构筑了牢固的隔离机制,使企业的竞争优势得以保持。
短句来源
     The detail work is as follows:First, using density-regulating mechanism, individual diversity retaining strategy and immune memory function and introducing the niche isolation mechanism, the improved immune genetic algorithm based on the adaptive selection probability of concentration and fitness is proposed.
     首先,利用生物免疫原理中的浓度调节机制和个体多样性保持策略以及免疫记忆功能,并引入了小生境隔离机制,提出了基于浓度和适应度的自适应式选择策略的改进的免疫遗传算法。
短句来源
     In order to avoid deleterious interferences between subsystems with different criticality,a kind of high dependability temporal isolation mechanism based on two level scheduling approach is brought forward.
     为防止不同关键度子系统间的有害干扰 ,提出了基于两级结构化调度方法的时间隔离机制 .
短句来源
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  隔离机理
     Isolation Mechanism of Supersensitization of Cyanine Dyes J- Aggregates
     J-聚集态染料超增感作用隔离机理
短句来源
  “isolation mechanism”译为未确定词的双语例句
     Firstly, based on the bionics of the woodpecker's brain vibration isolation mechanism, the bionic structure of MMVIP are designed.
     首先,在分析啄木鸟头部独特生物构造和隔振机理的基础上,运用仿生学原理设计了微制造隔振平台结构;
短句来源
     It is concluded that the basis for the isolation mechanism of supersensitization is a specific adsorption of organic compounds on (Ag, Au)S- centers.
     “隔离”是基于有机物在 (Ag,Au)S中心上的独特吸附。
短句来源
     Synthesizing the results of the research of power transmission of SMR model, the vibration isolation mechanism and the structure of a woodpecker's head and bionic mechanism, we desgn the Micro-Manufacturing platform.
     综合了SMR模型的的功率流传递特性研究和啄木鸟头部的隔振机理和生理结构的研究,再结合仿生学的原理设计了微制造隔振平台。
短句来源
     The fundamental differences of the isolation mechanism from well known Gilman′ s reduction mechanism allows to realize superadditive supersensitization effect by the use of compositions of organic substances with a various structures.
     “隔离”机理不同于熟知的 Gilman“还原”机理,根据本机理可通过不同结构有机物的组合应用使超增感作用获得超加和效应。
短句来源
     By means of the analysis on parallel vibration isolation mechanism of positive and negative stiffness, a new typed parallel nonlinear ultra-low frequency horizontal vibration isolation system with positive and inverse pendulums was developed.
     通过对正负刚度并联隔振机理的分析,研制了新型正倒摆并联非线性超低频水平隔振系统。
短句来源
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  isolation mechanism
We suggest that species with similar scents have allopatric distributions due to the absence of a pollinator isolation mechanism.
      
As this type of pollination represents a very effective pregamic isolation mechanism, these four taxa ofOphrys fusca agg., at least in southern Spain, behave and should be regarded as genuine species.
      
The species-specific, few-component volatile signals are thought to function as a reproductive isolation mechanism between the two sympatric species.
      
Hybrid sterility is the major reproductive isolation mechanism.
      
Hybrid sterility is a common postzygotic reproductive isolation mechanism that appears in the early stages of speciation of various organisms.
      
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There are two subspecies of migratory locusts in China. One is Locusta migratoria manilensis Meyen, distributing in the east and south-east area, and the other Locusta migratoria migratoria L. in north-west area. The basic chromosome numbers of these two subspecies are all 2n=22+X in male. They both have individuals with supernumerary chromosomes. The behavior of these chromosomes in spermatogenesis has been described.We obtained several hybrid individuals from a cross, Locusta migratoria migratoria L.♀×Locusta...

There are two subspecies of migratory locusts in China. One is Locusta migratoria manilensis Meyen, distributing in the east and south-east area, and the other Locusta migratoria migratoria L. in north-west area. The basic chromosome numbers of these two subspecies are all 2n=22+X in male. They both have individuals with supernumerary chromosomes. The behavior of these chromosomes in spermatogenesis has been described.We obtained several hybrid individuals from a cross, Locusta migratoria migratoria L.♀×Locusta migratoria manilensis Meyen. The hybrid meiosis has been studied in detail. It is found that it is quite normal with exception of forming occasionally chromatin bridges in anaphase ⅠandⅡ. Several male hybrids, which have been studied cytologically, possess supernumerary chromosomes in addition to normal chromosome complement. These individuals are apparently resulted from an union of gametes with supernumerary chromosomes. The behavior of these supernumerary chromosomes in hybrids during meiosis is similar to that of their parents.In the hybrid, chromatin bridges accompanied with fragments formed by one of the large bivalents have been found in first and second meiotic divisions. These suggest that there is an inversion in one of the large homologous chromosomes of the parental individuals.The isolation mechanism in these two subspecies has been discussed. And we suggest that geographical isolation is one of the most important factors.

我国的飞蝗在分类学上分为两个亚种,即Locusta migratoria manilensis Meyen和L.m.migratoria L.。这两个亚种的染色体基数均为2n=22+X((?))。在这两个亚种的许多个体中常有超数染色体存在。这些超数染色体在成熟分裂过程中的行为已加以描述。 两个飞蝗亚种的杂种可以在实验室条件下获得。杂种精巢的成熟分裂曾进行观察分析,其分裂过程大多正常进行。杂种个体亦含有超数染色体,这是由于含有超数染色体的配子结合的结果,所以证明至少一部分含有超数染色体的配子是有机能的。杂种的超数染色体在成熟分裂時的行为与亲本的相似。 根据我们所观察的几个杂种个体的成熟分裂,在杂种的染色体结构差別中可能有一逆位区存在。由于逆位双价体发生交換,可以在后期Ⅰ看到形成染色质桥和断片或断片,在后期Ⅱ形成染色质桥等图象。 认为这两个亚种隔离机制中起主要作用的因子之一可能是地理隔离。

The variability of biological populations is an attribute of all organic groups. During the 20's to 40's of this century, many important research ventures were aimed only to understand the intricated pattern of variability within plant species and populations. In the recent two decades, one of the important fields of study of evolutionary biology has been trans- ferred to the effects of ecological factors, both environmental and biotic, upon individual, population and species, and the practical implications...

The variability of biological populations is an attribute of all organic groups. During the 20's to 40's of this century, many important research ventures were aimed only to understand the intricated pattern of variability within plant species and populations. In the recent two decades, one of the important fields of study of evolutionary biology has been trans- ferred to the effects of ecological factors, both environmental and biotic, upon individual, population and species, and the practical implications of these effects in ecology, taxonomy and evolution. The problems of describing and classifying of infraspecific variation as both are nowadays one of the most challenging, and potentially one of most rewarding areas for further study. Plasticity and tolerance, which are frequently adaptive and of evolutionary and ecological importance, and which have traditionally received little attention from taxonomists, are widespread in flowering plants. But most of the plant species have limited plasticity, and populations of various localities of a single species often have different genotypes. These genotypes are results of complex interactions of genetical and ecological factors over a long period of time. Whether infraspecific variation is ecotypic or clinal depends upon the transitonal pattern-abrupt or gradual-between different climatic zones or conditions. But edaphic and biotic factors sometimes participate in racial differentiation. Variation within population or species does, not always result in external morphological differentiation. In many cases, the variation is physiological or biochemical. The microgeographical races, which can tolerate soils with high concentrations of lead, copper or zinc, are maintained by strong disruptive selection due to sharp changes in environmental conditions instead of intrinsic isolation mechanisms. Morphologically diverse populations may therefore maintain their identity over very short distances, provided environmental conditions change sharply in space. Polymorphism is probably correlated with natural selection. The main infra-specific categories of ICBN-subspecies, variety and forma, neither meet the needs for describing ecological diversity and intricated variability within species, nor correspond to the actual conditions of natural infraspecific groups. There is less agreement about the application of these categories and the taxoaomic treatment of plastic modifications. For a stable system of nomenclature, the taxoaomic recognition of plastic variation seems impracticable. The present author suggests that plant taxonomists should pay more attention to the discription and nomenclature for infraspecific variation and to employ more effective techniques for investigating such variation.

生物群体的变异性是有机体所有类群的一个属性。在本世纪的二十年代至四十年代,植物进化研究的一个重要的目的是了解种内和群体内存在的复杂的变异式样。近一、二十年来,进化生物学研究工作的一个重要的方面已转移到生态因素对个体、群体和种在环境和生物两方面的效应以及这些效应在生态学、分类学和进化中实际的含义上来。种内变异的描述和分类已成为当前最有挑战性的问题和最值得探索的领域之一。可塑性和耐受性在有花植物中普遍存在。但对大多数种来说,可塑性是有限的:一个具有较大分布区的种的不同地区的群体往往具有不同的基因型,而这些基因型是遗传和生态两个因素之间长时期复杂的相互作用的产物。种内变异是生态型性质还是梯度变异性质取决于自然界不同气候带或气候条件之间是急剧过渡还是逐渐过渡。但土壤和生物因素有时也参与宗的分化。群体和种内的变异不一定都有外部形态的变化,而是在多数情况下表现为生理和生化的差异。适应于富含铝、铜或锌等重金属盐的土壤的小地理宗是由足够强大的歧化选择而不是由内在的隔离机制来维持。多态现象,即群体内不同遗传变异体的频率变化,可能与自然选择有关。现有的主要种下分类等级——亚种、变种和变型,不仅不能满足描述种内生态多样性和复杂的变...

生物群体的变异性是有机体所有类群的一个属性。在本世纪的二十年代至四十年代,植物进化研究的一个重要的目的是了解种内和群体内存在的复杂的变异式样。近一、二十年来,进化生物学研究工作的一个重要的方面已转移到生态因素对个体、群体和种在环境和生物两方面的效应以及这些效应在生态学、分类学和进化中实际的含义上来。种内变异的描述和分类已成为当前最有挑战性的问题和最值得探索的领域之一。可塑性和耐受性在有花植物中普遍存在。但对大多数种来说,可塑性是有限的:一个具有较大分布区的种的不同地区的群体往往具有不同的基因型,而这些基因型是遗传和生态两个因素之间长时期复杂的相互作用的产物。种内变异是生态型性质还是梯度变异性质取决于自然界不同气候带或气候条件之间是急剧过渡还是逐渐过渡。但土壤和生物因素有时也参与宗的分化。群体和种内的变异不一定都有外部形态的变化,而是在多数情况下表现为生理和生化的差异。适应于富含铝、铜或锌等重金属盐的土壤的小地理宗是由足够强大的歧化选择而不是由内在的隔离机制来维持。多态现象,即群体内不同遗传变异体的频率变化,可能与自然选择有关。现有的主要种下分类等级——亚种、变种和变型,不仅不能满足描述种内生态多样性和复杂的变异式样的

This paper deals with hybrid F_1 fertility between Northeast sika deer and red deer. Observation from karyotype, G-banding pattern, C-banding pattern and Ag-NORs of hybrid F_1 showed that chromosomes of F_1 parents were high homologous except one Robertsonian translocation. When spermatocyte synaptonemal complex demonstrated F_1 meiosis, homologous chromosomes could pair very well and formed thirty-one normal autusomal bivalents, one acrocentric/metacentric trivaient and an XY pair. Trivalent Cis-configuration...

This paper deals with hybrid F_1 fertility between Northeast sika deer and red deer. Observation from karyotype, G-banding pattern, C-banding pattern and Ag-NORs of hybrid F_1 showed that chromosomes of F_1 parents were high homologous except one Robertsonian translocation. When spermatocyte synaptonemal complex demonstrated F_1 meiosis, homologous chromosomes could pair very well and formed thirty-one normal autusomal bivalents, one acrocentric/metacentric trivaient and an XY pair. Trivalent Cis-configuration advantaged that homologous chromosomes could segregate to doughter cells averagely and reproduced balanced gametes. Testis section confirmed that F_1 reproductive glands developed well. Therefore, bisexual F_1 can reproduce. There was unconsummate isolation mechanism between F_1 parents. The two species of deer belong to the same Mendelian population.

本文对东北梅花鹿与东北马鹿的F_1代杂种鹿的能育性进行了研究。从F_1的染色体组型、G带、C带和Ag-NOR_s 的观察表明,F_1双亲鹿的染色体高度同源,差异只涉及一个罗伯逊易位;精母细胞联会复合体显示出F_1减数分裂时,同源染色体能很好的配对,形成31个完整的常染色体联会复合体,1个端着丝粒染色体/中着丝粒染色体的三价体和XY双价体。三价体的顺式构型有利于同源染色体能平均分配到子细胞中而产生平衡配子;睾丸组织切片证实了F_1的生殖腺生长发育正常。所以,F_1两性皆育。说明其亲本鹿之间隔离机制不完善,这两和鹿应属同一个孟德尔群体。

 
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