遺傳位置效應 的英文怎麼說
中文拼音 [yízhuànwèizhìxiàoyīng]
遺傳位置效應
英文
genetic position effect- 遺 : 遺動詞[書面語] (贈與) offer as a gift; make a present of sth : 遺之千金 present sb with a gener...
- 傳 : 傳名詞1 (解釋經文的著作) commentaries on classics 2 (傳記) biography 3 (敘述歷史故事的作品)...
- 位 : Ⅰ名詞1 (所在或所佔的地方) place; location 2 (職位; 地位) position; post; status 3 (特指皇帝...
- 置 : 動詞1. (擱; 放) place; put; lay 2. (設立; 布置) set up; establish; arrange; fix up 3. (購置) buy; purchase
- 效 : Ⅰ名詞(效果; 功用) effect; efficiency; result Ⅱ動詞1 (仿效) imitate; follow the example of 2 ...
- 應 : 應動詞1 (回答) answer; respond to; echo 2 (滿足要求) comply with; grant 3 (順應; 適應) suit...
- 遺傳 : [生物學] heredity; hereditary; inheritance; inherit
- 效應 : [物理學] effect; action; influence
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Chloroplast genetic engineering, a new technology that could overcome many problems associated with nuclear genetic engineering, is of growing interest for bioproduction of valuable materials. it has several advantages including the extraordinarily high level of transgene expression and environmental safety, the favorable environment for prokaryote gene expression, the absence of " position effect " and gene silencing
葉綠體基因工程是隨著植物遺傳轉化技術發展剛剛興起的生物技術,具有超量表達外源基因,為原核基因提供適宜表達環境,消除「位置效應」和基因沉默,環境安全性好等優點,較更適合用於植物生物反應器方面的研究。Though the technique of nuclejc transformation in plants has been developed and used widely, some problems in genetic information have not been resolved. for example, because the nucleic genome is so big and complicated that the integration sites and copies of foreign gene can not be controlled accurately, the expression of transferred genes is inefficient as a result of gene silencing or position effect. in nucleic transformation, furthermore, the transfer of multigene is difficult, and only after the prokaryotic genes undergo modification are they expressed in high plants
植物的細胞核轉化技術已發展成熟並得到廣泛應用,但核基因組的遺傳轉化仍存在一系列至今尚未解決的問題:例如由於核基因組大,背景復雜,外源基因的整合位點和整合的拷貝數難以人為控制,造成鄭州大學2003年博士學位論文杜氏鹽藻( dunaliellasalina )葉綠體轉化研究外源基因表達效率低,容易出現基因失活、基因沉默、位置效應等現象;同時轉入多個基因時操作步驟過于復雜,所表達的原核基因必須經過修飾改造,環境安全難以保證等。Besides, it is not fit with the precise adjustment and is difficult to conform the place. a new adaptive genetic algorithm with bp algorithm to optimize weight is backed up. the algorithm which combines the merits of the global convergence of genetic algorithm with fast local researching of bp algorithm not only intensifies the gradual convergence and evolution ability but also advance the speed of convergence, precision of training and generalization
針對傳統遺傳演算法的搜索過程帶有一定的盲目性,其收斂特性不穩定且收斂速度緩慢,特別是在系統規模較大時,優化效果的明顯改善往往需要相當長的時間,而且不適合候選解的精調,難以確定解的確切位置,提出一種新型自適應性遺傳演算法,並在此基礎上,用bp演算法優化前向神經網路權值,綜合了兩種演算法的優點,即遺傳演算法的全局收斂性和bp演算法局部搜索的快速性,強化了遺傳演算法的漸進收斂和進化能力,全面改善了演算法的收斂性,提高了收斂速度及訓練精度,也擴展了泛化能力。
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