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natural genetic
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  自然遗传
     It is important for traditional tree breeding to utilize the existing natural genetic variation of tree species, the target traits were improved by selection.
     常规林木育种最重要的途径是利用树种现有的自然遗传变异以及利用育种手段创造遗传变异 ,通过选择获得优良品种 ,使目的性状在遗传上得到改良。
短句来源
     Natural Genetic Algorithm and Its Performance Analysis
     自然遗传算法及其性能分析
短句来源
     Based on the essence of the natural genetic mechanism,mind evolutionary algorithm is improved.
     依据自然遗传机制的本质,从分形的角度出发,通过引入自相似度量因子对思维进化算法作了改进。
短句来源
     Intercelluar Natural Genetic Transformation of Genetically Engineered Microorganisms
     遗传工程微生物细胞间发生的自然遗传转化
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     Genetic Algorithms (GA) is a random optimization method based on natural selection theory and natural genetic mechanics.
     遗传算法(GA)是一种基于自然选择原理和自然遗传机制的随机优化方法。
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  “natural genetic”译为未确定词的双语例句
     This article discusses the specialities of the developing TCM Genetics,the genetic experiments on Chinese Medicine's Pharmacology,the genetic observation of natural genetic XIANG and the completion of the history of TCM Genetics.
     本文对将兴起的中医遗传学关于中药药理遗传实验,自然整体性状遗传观察,行为遗传“象”的宏观表征以及弥补中国遗传学史空白等特色研究领域进行了论述。
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     Moreover, the transformation frequency was related to Ca 2+ concentration and a proper time was required for accomplishing natural genetic transformation.
     在一定范围内 ,大肠杆菌的转化频率与环境中的 Ca2 + 浓度成正相关 ,并且这种准自然条件下的转化需要一定的时间 .
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     Methods:Antisense oligodeoxyribonucleotide targeted to gtfB sequence 709~726 bp(PS-ODN1) and 3 479~3 497 bp(PS-ODN2) were synthesized. Natural genetic transformation of S.mutans with PS-ODN1 and PS-ODN2 was respectively performed.
     方法:合成针对gtfB709~726 bp及3 479~3 497 bp的反义脱氧寡核苷酸并进行硫化。
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     Genetic algorithms are global search algorithms based on natural selection and natural genetic mechanism.
     遗传算法是一种基于自然选择和自然遗传学机理的全局搜索学习算法。
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     By employing the plate transformation method, the study on Bacillus subtilis cell-to-cell natural genetic transformation was carried out The results showed that the bacteria cultured in the both LB and MM media could actively excrete transforming DNA at exponential growth stage.
     以平板转化法研究了枯草杆菌在液体基本培养基 (MM)及LB中培养时通过DNA释放和感受态建立进行的细胞间自然转化 .
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  相似匹配句对
     The genetic
     用等电聚焦免疫固定技术调查成都地区汉族群体Bf的遗传多态性。
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     Natural.
     Natural(天然等同)相近。
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     Genetic Indicators for Natural Gases
     天然气成因类型及判别标志
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     Natural Genetic Algorithm and Its Performance Analysis
     自然遗传算法及其性能分析
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     The genetic distance of L d .
     分离株分别聚为两类 ,两者遗传距离较远 ;
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  natural genetic
To investigate natural genetic diversity of this enzyme a nested PCR reaction was developed to obtain NS3 protease sequence data directly from patient strains.
      
Genetic algorithms (GAs) are stochastic adaptive algorithms whose search method is based on simulation of natural genetic inheritance and Darwinian striving for survival.
      
Natural genetic engineering of plant cells: the molecular biology of crown gall and hairy root disease
      
Natural genetic modification has commerical attractions where the processes can be exempted from regulation.
      
Bacillus thuringiensis: ecology, the significance of natural genetic modification, and regulation
      
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The present paper deals with the results of a comprehensive experiment on seed; lings of masson pine (Pinus massoniana Lamb.) which is the most important timber species in Fujian Province. In order to study and exploit its natural genetic resource, some selected samples from different provenances (within its natural range), stands (in Fujian Province) and families (in a stand covering 75 mu) were compared so that the most economical breeding program could be found out. The results indicated that...

The present paper deals with the results of a comprehensive experiment on seed; lings of masson pine (Pinus massoniana Lamb.) which is the most important timber species in Fujian Province. In order to study and exploit its natural genetic resource, some selected samples from different provenances (within its natural range), stands (in Fujian Province) and families (in a stand covering 75 mu) were compared so that the most economical breeding program could be found out. The results indicated that for all the measured phenological and morphological characteristics, provenance resu^ Ited in the highest degree of variation. Selecting suitable southern provenance plants for reproduction would obtain greater increment in the seedling stage. But they are by nature some populations in response to continuous ecological factors. Variations of plants among different stands showed a random pattern which indicated that the desirable stand would be within a short distance. As compared with plants from different stands, plants from different half-sib families could give greater variations in height growth, though their ecological characteristics were rather consistent. This suggests that when stands are to be selected, plus trees should also be simultaneously selected in order to establish clone seed orchards after progeny testing. Greater increment would be obtained from selections between half-sib families in addition to selections between different stands than from the latter alone. Variations among plants from stands at different elevation could provide more benefit than from among populations in the vicinity,

马尾松是福建省最重要的用材树种。本文对马尾松的群体和个体的遗传变异进行分析研究, 目的在于发掘当地树种的遗传资源,科学地制定马尾松的遗传改良程序,以及为当前林业生产中种子调拨和建立采种基地等工作提供依据。 1979年,共采集种子样本73份,包括全国不同产地、省内不同林分,同一林分不同家系和不同海拔高度的林分。1980年,于洋口,官庄林场作苗期比较。观测项目有种子大小,重量、发育程度、苗木高度,地径。封顶率和其它性状。根据试验结果,本文对各种变异类型做出了评价,并对福建省内马尾松的遗传改良程序提出初步意见。

Some interspecific fusants which successfully was obtained between protoplasts of P. sajor-caju and P. rhodophyllus by electrofusion with BAEKON 2 000 Advanced Gene Transfer System (BAEKON, INE USA). P. sajor-caju and P. rhodophyllus were dikaryons strains with natural genetic markers and used as original parents. The basidiospores of their auxotrophic mutants were used as parent strains. Only fusant(F57) has produced fruit bodies. Based on the characterization of morphology, physiology, Biochemistry and...

Some interspecific fusants which successfully was obtained between protoplasts of P. sajor-caju and P. rhodophyllus by electrofusion with BAEKON 2 000 Advanced Gene Transfer System (BAEKON, INE USA). P. sajor-caju and P. rhodophyllus were dikaryons strains with natural genetic markers and used as original parents. The basidiospores of their auxotrophic mutants were used as parent strains. Only fusant(F57) has produced fruit bodies. Based on the characterization of morphology, physiology, Biochemistry and genetics of fusant, F57,and comparision with their parents F57 is a new interspecific hybrid strain.

以有自然标记的双核凤尾菇(Pleurotus sajor-caju)和桃红平菇(P.rhodophyllus)为出发菌株,以它们携带营养缺陷型标记的单孢菌株为直接亲本,采用BAEKON 2000基因转移仪进行侧耳属种间原生质体电融合,成功地获得若干株融合体,其中有一株编号为F57的融合体已培育出子实体。比较了融合体F57与亲本的形态、生理、生化和遗传等性状,结果证实,融合体F57是一株新的种间杂种菌株。

Gene transfer methods are developing quickly recently, but each method has its limitations. We introduce a new gene transfer technique in this paper, which is simple, effective, and easy to operate,but does not get enough attention from scientists. This technique is used to transform plants by in jecting exogenous DNA to stigma, style, ovary, young fruit or meristem of the recipient, or soaking the recipient's seeds in exogenous DNA solution. Lots of heritable variations were found in many characters of many...

Gene transfer methods are developing quickly recently, but each method has its limitations. We introduce a new gene transfer technique in this paper, which is simple, effective, and easy to operate,but does not get enough attention from scientists. This technique is used to transform plants by in jecting exogenous DNA to stigma, style, ovary, young fruit or meristem of the recipient, or soaking the recipient's seeds in exogenous DNA solution. Lots of heritable variations were found in many characters of many crops. It may be used to create new germplasms or realize gene exchange between different species, genera, or families, even between animals and plants. A brief discussion was given to the mechanism of exogenous DNA introduction, integration into and expression in the recipient. We also discussed the merits and limitations of the technique.Currently there are two successful approaches that can be used to transform paints genetically,but each method has its limitations that are delaying the application of the techniques to certain commercially important crops. The first technique exploits a natural genetic engineer, Agrobacterium tumefaciens, which contains a tumor-inducing (Ti) plasmid that transfers a DNA segment (the T-DNA) from the plasmid to the nuclear genome of infected plants (or in vitro to plant tissue). The method is restricted to dicotyledenous plants; monocotyledenous plants are usually not susceptible to agrobacterial infection. The second technique involves direct transfer of DNA to plant protoplast, prepared by enzymatic digestion of cell walls, for example by chemically stimulated uptake using polyethylene glycol or a high voltage pulse, generating transient 'holes' in the protoplast membrane. This technique depends on a tissue culture system that allows regeneration of mature plants from protoplasts. But so far it is impossible to achieve plant regeneration from protoplasts in many crops. Both techniques use dominant selectable markers (for example, kanamycin resistance) to select for the transformed tissue or plant which can then be screened for expression of co-transferred but unselected genes (Lichenstein, 1987).Now there is a new successful method which can transform various crops, regardless of dicots or monocots, cereals or legumes. It doesn't need Agrobacterium tumefaciens and plasmid, doesn't depend on the tissue culture system that allows regeneration of mature plants from protoplasts.Comple and advance equipments are not necessary. It is very simple, but very effective. Next is a review about the technique, its application in several crops, the mechanism of transformation, and its merits and limitations.

TransgenicCropsbyDirectTreatmentofExogenousDNAwithoutAgrobacteriumtumefaciensPlasmidandTissueCulture¥ZhangGuodong(NortheastAg...

 
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