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多着丝点
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  “多着丝点”译为未确定词的双语例句
     It is the main factor of F1 generation with higher sterility than P generation that the radiation damage of chromosome can be inherited and strongly expressed in F1 generation. Because of the dominant lethal mutation of F1 generation leading to high rate of death, there was less chromosomal aberration in F2 generation.
     的辐射损伤可传递到后代,F_1代变异率为83.6%,变异类型主要为“断片”、“桥”,“多着丝点体”等,而且易位染色体数目较多,从而导致F_1高度不育。
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     Mean- while,the polycentric chromosome derived from the fusion of several chromosomes and chias- mata of somatic chromosomes were clearly observed in callus cells,indicating that crossover and translocation occured in somaclones.
     特别在愈伤组织细胞中观察到多条染色体融合成多着丝点染色体和体细胞的染色体交叉,说明无性系中发生了染色体的交换和易位。
短句来源
     The chromosome number of Asian Corn Borer was n=31.Irradiation induced a lot of aberrations in chromosome structure in P generation and it inherited to F1 generation.
     结果表明,亚洲玉米螟的正常染色体为n=31,属多着丝点染色体。
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  相似匹配句对
     Multiple target Tracking
     目标跟踪
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     TRACKING OF MULTIPLE TARGETS
     目标跟踪
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     CERTROMERES AND THEIR EVOLUTION
     着丝点及其进化
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     The chromosome number of Asian Corn Borer was n=31.Irradiation induced a lot of aberrations in chromosome structure in P generation and it inherited to F1 generation.
     结果表明,亚洲玉米螟的正常染色体为n=31,属着丝点染色体。
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The chromosomal aberration, its genetic effect and the structurally abnormal sperms Peach Fruit Borer ( PFB ) irradiated with substerilizing dose were described in this paper.The numbers of chromosome of PFB were n=31.The longest chromosome was 4.43±0.49 μ.The shortest one was 1.54±0.15μTotal chromosome lengh was 96.37±10.7.5μ.The variation rate of the chromosome was 83.6% in F1 generation including, several kind of aberration,such as fragments,chains, bridges etc.The main chromosomal rearrangement was reciprocal...

The chromosomal aberration, its genetic effect and the structurally abnormal sperms Peach Fruit Borer ( PFB ) irradiated with substerilizing dose were described in this paper.The numbers of chromosome of PFB were n=31.The longest chromosome was 4.43±0.49 μ.The shortest one was 1.54±0.15μTotal chromosome lengh was 96.37±10.7.5μ.The variation rate of the chromosome was 83.6% in F1 generation including, several kind of aberration,such as fragments,chains, bridges etc.The main chromosomal rearrangement was reciprocal transloca-tion involving many chromosomes. It is the main factor of F1 generation with higher sterility than P generation that the radiation damage of chromosome can be inherited and strongly expressed in F1 generation. Because of the dominant lethal mutation of F1 generation leading to high rate of death, there was less chromosomal aberration in F2 generation. The variation rate was 12.5%.Another kind of aberration-micronucleus was observed in P, F1 and F2 generation.It agreed with the result of chromosomal analysis.The spermatozoal structure of PFB was similar to that of other lepi-dopterous species.Irradiation of newly emergence adults resulted in rupture of sperm, damage of axoneme configuration, change of number of axoneme and mitochondrialderivative. These genetic abnormalities of ultrastructure of sperm were inherited more intensely in F1 progeny, produced from the cross of P male adults with the irradiated females

本文研究了亚不育剂量对桃小食心虫Carposina nipponensis(Wals.)染色体的影响及其遗传效应,并对其精子结构变异进行了超微观察。结果表明,正常桃小食心虫染色体结构为漫散着丝点,其数目n=31。最长染色体为4.43±0.49μ,最短为1.54±0.15μ,总长度为96.39±10.75μ,长度变异范围S%=34.76。亚不育剂量(25kR)诱导的染色体变异结果表明,亲代(F。)的辐射损伤可传递到后代,F_1代变异率为83.6%,变异类型主要为“断片”、“桥”,“多着丝点体”等,而且易位染色体数目较多,从而导致F_1高度不育。F_2代畸变率降低,易位染色体数目也较少,育性得到部分恢复。亚不育剂量辐照能使桃小食心虫产生微核。微核测定法可作为衡量桃小食心虫细胞辐射变异的简易指标。 桃小食心虫精子的超微结构与鳞翅目其它昆虫相似,轴丝构型为(9)十9十2。亚不育剂量能使精子产生破裂、空泡、微核,轴丝构型异常,轴丝和线粒体衍生体数目及形态发生变化等,并在F_1代得到加强。

Calli were induced from the young leaves and mature embryos of seven wheat-wheatgrass alien additional lines,and somaclones were established from the calli.A large number of plantlets were obtained and survived after transplantation. The medium WG used for tissue culture of wheat-wheatgrass alien addition lines was set up in the experiment.The methods induced callus with two kinds of media were used.The first medium WG_2 supplemented with 4mg/l 2,4-D and ling/l NAA was used for callus for- mation.The second...

Calli were induced from the young leaves and mature embryos of seven wheat-wheatgrass alien additional lines,and somaclones were established from the calli.A large number of plantlets were obtained and survived after transplantation. The medium WG used for tissue culture of wheat-wheatgrass alien addition lines was set up in the experiment.The methods induced callus with two kinds of media were used.The first medium WG_2 supplemented with 4mg/l 2,4-D and ling/l NAA was used for callus for- mation.The second medium was WG_2 with 2mg/l 2,4-D,0.5mg/l NAA and 0.25mg/l KT. Differentiation medium used was WG_3 with 0.5mg/l KT,ling/l NAA and 100mg/l adenylic acid. The examination of the chromosomes in regenerated plants indicated that the chromoso- mal number variation was remarkable.The plants maintaining 2n=44 were only 34.4% of the total regenerated plants,and the plants with the chromosomal number returned to 2n=42 ma- de a relatively greater part of the variational plants regenerated.About half of the regenera- ted plants showed morphological variations.The crossover,translocation and other chromo- somal structural changes were found in PMCs of the variational plants regenerated.Mean- while,the polycentric chromosome derived from the fusion of several chromosomes and chias- mata of somatic chromosomes were clearly observed in callus cells,indicating that crossover and translocation occured in somaclones.

从7种小冰麦异附加系的幼叶和成熟胚诱导出愈伤组织,建立了体细胞无性系,获得大量试管苗,并移栽成活。实验设计了适于小冰麦异附加系组织培养的 WG 培养基。愈伤组织诱导采用二次诱导方法。第一诱导培养基为 WG_2附加4mg/1 2,4-D、1mg/1 NAA。第二诱导培养基为 WG_2附加2m//1 2,4-D、0.5mg/1 NAA,和0.25mg/1KT。分化培养基为 WG_3附加0.5mg/1 KT、1mg/1 NAA 和100mg/1 Ad。再生植株的染色体检查表明,异附加系无性系的染色体数变异明显。保持2n=44的再生植株只有34.4%,而且变异植株中回复到2n=42的植株较多。再生植株中约有1/2发生了形态变异。在变异植株的花粉母细胞中观察到染色体的交换、易位等结构变化。特别在愈伤组织细胞中观察到多条染色体融合成多着丝点染色体和体细胞的染色体交叉,说明无性系中发生了染色体的交换和易位。

This paper deals with studies on the pupal development, morphology of the reproductive system, genesis of the germ cells and impact of radiation on the structure of egg and sperm of the Chinese citrus fly (CCF), Dacus citri. The development of somatic cells completed in the late pupal stage, while eggs were in the germarial cyst of the female pupae and many sperms formed in the males. Exposure of matured pupae to 9 Krad gamma-ray did not affect the adult activity and mating capability but induced full sterility....

This paper deals with studies on the pupal development, morphology of the reproductive system, genesis of the germ cells and impact of radiation on the structure of egg and sperm of the Chinese citrus fly (CCF), Dacus citri. The development of somatic cells completed in the late pupal stage, while eggs were in the germarial cyst of the female pupae and many sperms formed in the males. Exposure of matured pupae to 9 Krad gamma-ray did not affect the adult activity and mating capability but induced full sterility. It is suggested that the late pupal stage is the optimum irradiating period and 9 Krad is an appropriate irradiating sterile dosage. It was found that the number of chromosomes of CCF was 2n=12. The total length of chromosome was 56.2 um, and the deviation of chromosomal length was from 6.52 to 1.10 um. The Karyotype was not symmetric. Content of DNA in salivary gland and larval intestinal cells of CCF declined 24 hr. after irradiation but recovered gradually.

本文研究了柑桔大实蝇蛹的发育,生殖系统和生殖细胞的发生及辐射对卵子、精子及其超微结构的影响。后期蛹体细胞分化发育完成时,卵子尚处于卵原囊期,雄虫已形成大量成熟精子。用9krad照射后期蛹,不影响成虫的活动和交尾竞争能力,但可导致大实蝇不育。大实蝇染色体数目为2n=12,总长度56.2μm,长度变异范围6.52~1.10μm,属中等非对称核型。辐照后引起染色体断裂而导致缺损、多着丝点环等畸变,使细胞分裂受阻引起不育。唾腺及肠细胞辐照以后24小时DNA含量明显下降,但能逐步修复。

 
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