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染色单体桥
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  chromatid bridge
     The lagging chromosome, chromatid bridge and multivalent were observed in meiosis of pollen mother cell of amphidio-ploid.
     这些双二倍体花粉母细胞的染色体,在减数分裂中,也均出现落后染色体和染色单体桥,以及较多的多价体。
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  “染色单体桥”译为未确定词的双语例句
     These facts just referred to, as it appears to us, with other abnormalities of meiotic behaviour in these three species, such as presence of chromatid bridges and preferential segregation, and with the lower fertility found in them, afford the evidence in favour of suggesting that the species having 2N = 24 among the existing Pinaceae would be probably the polyploids which had originated evolutionally from the extinct species having 2N=12.
     结合三种植物减数分裂过程中出现的其它一些行为异常,如出现染色单体桥和提前分离的现象,以及三种植物的生育能力较低等等; 我们认为现存松科的这些2n=24的物种可能是来自2n=12的早已灭绝的同缘或近缘的物种。
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  相似匹配句对
     bridge
    
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     The Bridge
    
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     The lagging chromosome, chromatid bridge and multivalent were observed in meiosis of pollen mother cell of amphidio-ploid.
     这些双二倍体花粉母细胞的染色体,在减数分裂中,也均出现落后染色体和染色单体,以及较多的多价体。
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  chromatid bridge
The resultant chromatid bridge resulted in a double-stand break.
      
Chromatid bridge formation varied from 13.1 to 10.25% in the first and second anaphases respectively.
      
Deorientation of centromeres, a dicentric chromosome may produce a two-chromatid bridge in mitotic anaphase, thereby a chromo some-type BFB cycle.
      
This loop produces a chromatid bridge the first mitotic anaphase.
      


In studying meiotic activities in the microsporocytes of Pinus bungeana, Pinus tabulaeformis, and Picea meyeri of Pinaceae, it has been established that all these three species have 2N = 24; and that the secondary pairing of chromosomes during diakinesis and the multipolar division beginning from metaphase I were evident. These facts just referred to, as it appears to us, with other abnormalities of meiotic behaviour in these three species, such as presence of chromatid bridges and preferential segregation,...

In studying meiotic activities in the microsporocytes of Pinus bungeana, Pinus tabulaeformis, and Picea meyeri of Pinaceae, it has been established that all these three species have 2N = 24; and that the secondary pairing of chromosomes during diakinesis and the multipolar division beginning from metaphase I were evident. These facts just referred to, as it appears to us, with other abnormalities of meiotic behaviour in these three species, such as presence of chromatid bridges and preferential segregation, and with the lower fertility found in them, afford the evidence in favour of suggesting that the species having 2N = 24 among the existing Pinaceae would be probably the polyploids which had originated evolutionally from the extinct species having 2N=12.

对白皮松(Pinus bungeana)、油松(Pinus tabulaeformis)、白杆(Picea meyeri)三种松科(Pinaceae)植物小孢子母细胞减数分裂过程的观察,确定了这三种植物的染色体数目为2n=24。发现这三种植物在第一次减数分裂的终变期中都出现染色体的次级配对现象,中期都出现多极分裂现象;结合三种植物减数分裂过程中出现的其它一些行为异常,如出现染色单体桥和提前分离的现象,以及三种植物的生育能力较低等等;我们认为现存松科的这些2n=24的物种可能是来自2n=12的早已灭绝的同缘或近缘的物种。

The present paper deals with the process of meiotic divition of pollen mother cells, microsporogenesis and development of male gametophyte of Pinus yunnanensis Franch. It is observed that nonsynchronous phenomenon in meiotic division of PMCs, some development abnormal microspore, chromatid bridge and chromosome segment in anaphase Ⅰ and some cell nuclear division direction is abnormal in male gametophyte development. It is similar with another report that chromosome number is 2n=24 in Pinus yunnanensis Franch....

The present paper deals with the process of meiotic divition of pollen mother cells, microsporogenesis and development of male gametophyte of Pinus yunnanensis Franch. It is observed that nonsynchronous phenomenon in meiotic division of PMCs, some development abnormal microspore, chromatid bridge and chromosome segment in anaphase Ⅰ and some cell nuclear division direction is abnormal in male gametophyte development. It is similar with another report that chromosome number is 2n=24 in Pinus yunnanensis Franch.

本文详述了云南松花粉母细胞的减数分裂、小孢子发生及雄配子体形成过程。在研究中发现:花粉母细胞在减数分裂中有明显的不同步现象;有少数发育畸形的小孢子;在减数分裂后期Ⅰ有染色单体桥及染色体片断出现;雄配子体发育过程中核分裂的方向异常;染色体数目2n=24与其它报道一致。

By means of young embryo culture, F1 plants of the interspecific cross between Lycoper-sico esculentum (five cultivars) and L. peruvianum (Strain 8 of variety PI 128657) were obtained. The analysis of chromosome behavior in miosis and frequency of bivalent chiasma at diakinesis of pollen mother cells of F1 hybrid plants, and the affinity extent were reported in this paper.The test results showed that chromosome behavior of pollen mother cells of 6 parents in meiosis was normal. The chromosome configuration was...

By means of young embryo culture, F1 plants of the interspecific cross between Lycoper-sico esculentum (five cultivars) and L. peruvianum (Strain 8 of variety PI 128657) were obtained. The analysis of chromosome behavior in miosis and frequency of bivalent chiasma at diakinesis of pollen mother cells of F1 hybrid plants, and the affinity extent were reported in this paper.The test results showed that chromosome behavior of pollen mother cells of 6 parents in meiosis was normal. The chromosome configuration was 12 bivalents at meptaphase I. Most of them were ring bivalent, and a few of them were rod bivalent. There was no univalent at metaphase 1. The meiosis behavior was all normal at anaphas Ⅰ and Ⅱ. The micronuclei were not observed in tetrad stage. Number of ring and rod bivalent was different at diakinesis and metaphase I of 6 parents. It is possible that the affinity extent of different parent igenetypes exists no coordination in genetics.At meiosis, chromosome behavior of pollen mother cells of most F1 hybrid plants in five combinations was normal. Chromosome configuration usually was 12 bivalents, but the chromosome pairing was not stable. There were a number of univalents and chromatid bridge. Micronuclei were observed in the tetrad stage. In addition, the pollen mother cells of amphidi-ploid appeared in all F1 hybrid plants of five combinations. The lagging chromosome, chromatid bridge and multivalent were observed in meiosis of pollen mother cell of amphidio-ploid. There were micronuclei and tetraspores of various types in the tetrad stage.

本文报道了栽培番茄(Lycopcrsico esculentum)“北京早红”等5个品种分别与野生型秘鲁番茄(L.peruvianum) PI128657中8号株系杂交,离体胚培养,得F_1杂种植株。对花粉母细胞在减数分裂中染色体行为和终变期二价体交叉点的频率,以及亲和性程度等进行了分析。 结果表明:6个亲本植株花粉母细胞减数分裂染色体的行为是正常的,中期Ⅰ为12个二价体。其中环状二价体占多数,棒状二价体敦较少。中期Ⅰ没有单价体。后期Ⅰ和Ⅱ均正常。四分体阶段无微核出现。但各亲本在终变期和中期Ⅰ的环状二价体和棒状二价体的数有一定的差异。这可能与不同亲本基因型的亲和性程度和在遗传学上的不协调有关。 5个组合的大多数F_1杂种花粉母细胞减数分裂中染色体行为基本正常。12个二价体占多数。但染色体配对不稳定,有较多的单价体,染色单体桥。四分体阶段有微核。此外,在5个组合的F_1杂种植株中,均出现双二倍体花粉母细胞。这些双二倍体花粉母细胞的染色体,在减数分裂中,也均出现落后染色体和染色单体桥,以及较多的多价体。四分体阶段有微核和不同类型的四分孢子群。

 
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