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切除频率
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  excision frequency
     RFLP (restriction fragment length polymorphism) analysis showed that the transposon is 3 cM (centiMorgan) away from the S locus and retains high transpositional activity with a germinal excision frequency of 20%.
     限制性酶切片段长度多态性 (RFLP)的分析证明该转座子距S位点约 3cM (centiMorgan) ,并且保持了较高的转位活性 ,其配子切除频率高达 2 0 %。
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  相似匹配句对
     FREQUENCY
     生死频率
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     ON FREQUENCIES
     频率
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     ③ resection of the cystic wall;
     ③囊肿切除;
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     Removal of the retained cervical stump
     宫颈残端切除
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  excision frequency
Growth on artificial media increased the somatic excision frequency, and the long-term selection procedure channelled somatic transposition events into the germline.
      
This resulted in an overall germinal excision frequency in the progeny of longterm selected plants of 15%, as confirmed by Southern blotting, with 63% of the plants bearing excision events having detectable reinsertions of the Ac element.
      
This compares with a germinal excision frequency of approximately 1% when no long-term selection is employed.
      
By increasing the direct repeat length from 9 bp to 18 and 27 bp, the precise excision frequency was raised by 3 and 4 orders of magnitude, respectively.
      
In addition, irrespective of the direct repeat length, the presence of flanking inverted repeats enhanced the excision frequency by 3 orders of magnitude.
      
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In order to perform mutational studies on genes from the self_incompatibility ( S ) locus, an S locus_ directed transposon tagging system was established in Antirrhinum . Cultivated lines of Antirrhinum majus contain many molecularly well_characterized transposons, but are self compatible due to the presence of a nonfunctional S locus ( Sc ). In this study, an active transposon ( Tam 5) from the Cycloidea (Cyc ) locus controlling flower asymmetry in A. majus was introduced to...

In order to perform mutational studies on genes from the self_incompatibility ( S ) locus, an S locus_ directed transposon tagging system was established in Antirrhinum . Cultivated lines of Antirrhinum majus contain many molecularly well_characterized transposons, but are self compatible due to the presence of a nonfunctional S locus ( Sc ). In this study, an active transposon ( Tam 5) from the Cycloidea (Cyc ) locus controlling flower asymmetry in A. majus was introduced to a position tightly linked to the functional S locus from self incompatible interspecific hybrids ( A. majus×hispanicum ) through genetic recombination. RFLP (restriction fragment length polymorphism) analysis showed that the transposon is 3 cM (centiMorgan) away from the S locus and retains high transpositional activity with a germinal excision frequency of 20%. Possible implications of the linkage between the S locus and genes controlling floral phenotypes were discussed. An active transposon tightly linked to the S locus constructed here will facilitate the generation of insertional mutants of the S locus encoded genes and may lead to dissecting their precise roles during self_incompatible reactions.

栽培金鱼草 (AntirrhinummajusL .)中有许多分子生物学上研究得较为透彻的DNA转座子 ,但是它们的S位点已经失去了功能 (Sc)位点 ,故而为自交亲和。为了利用这些转座子进行S位点选择性的转座子标定实验 ,将一个来自栽培金鱼草花型基因Cyc的活跃转座子Tam5通过遗传重组的方法引入到与自交不亲和金鱼草种间杂种(A .majus×hispanicum)S位点紧密连锁的位置。限制性酶切片段长度多态性 (RFLP)的分析证明该转座子距S位点约 3cM (centiMorgan) ,并且保持了较高的转位活性 ,其配子切除频率高达 2 0 %。同时 ,还讨论了花型和自交不亲和性基因连锁的可能的生物学意义。所建立的S位点选择性的转座子标定体系为详细研究金鱼草S核酸酶基因及其不同结构域在自交不亲和反应中的作用提供了新的技术平台。

A new method of optimizing the Underfrequency load shedding (UFLS) has been developed in the paper. The main idea is that on the basis of the on-line measurement of the load frequency regulation factor, the load with smaller frequency regulation factor is cut off earlier than those with larger frequency regulation factor, therefore the power from sources will be much decreased and the power balance will be achieved more quickly in the transient process. The realization method and digital simulation of the proposed...

A new method of optimizing the Underfrequency load shedding (UFLS) has been developed in the paper. The main idea is that on the basis of the on-line measurement of the load frequency regulation factor, the load with smaller frequency regulation factor is cut off earlier than those with larger frequency regulation factor, therefore the power from sources will be much decreased and the power balance will be achieved more quickly in the transient process. The realization method and digital simulation of the proposed scheme have been presented t.

低频减载是电力系统抑制频率下降、维持系统频率稳定的有效方法。该文针对目前低频减载方案中忽略了负荷频率特性的不足,提出了一种新的计及负荷频率特性的低频减载方案,该方案充分利用了频率下降时,负荷自身吸收的功率也下降的特点,优先切除频率调节系数小的线路,此举有利于系统频率的快速恢复和系统稳定,文中对方案的实现进行了详细的介绍,并采用单机系统进行了数字仿真,仿真结果验证了该方案的合理性。

 
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