natural mutation 中文意思是什麼
natural mutation
解釋
自然突變-
The contents of this studies include : 1 ) according to the researches on the correlation between the function and structure of the cmiv from bombyx - moxi before by others, especially by lixinlal in naigin normal university of china, we have designed and sythesized the mutation i of the gene of cmiv that was different from the natural cmiv about 50 % in amino sequence, using the favorable condon of the ecoli. after cheked the result of synthesis by sequence, we have cloned the gene into 3 " of the gene of thioredoxin in the thio - fusion expression vector ( ptxfus ), and the fusion protein of thio - cmiv was highly expressed in soluble form
本研究的內容包括：一、在前人對抗菌肽cmiv研究的基礎上，對n端和c端進行氨基酸保守變換，設計和合成了該基因，充分使用大腸桿菌偏愛的密碼子，並將該基因5端與硫氧還蛋白基因3端融合，通過ptxfus表達載體獲得較高可溶性表達（在15 sds - page膠上可見明顯的表達蛋白帶） 。 -
3 ) foa ( fluoroorotic acid ) treatment with the dominant negative mutants showed that the dominant negative effects of mutants were caused by the presence of the gpi17 vector, not by another mutation located somewhere in the genome and in a gene involved in the natural resistance against copper
3 ） foa （ 5 -氟-乳清酸）處理突變體細胞表明，得到的顯性負性突變體不是細胞中銅抗性基因突變的產物，其確為gpi17突變引起。 -
Studies on the mutation breeding of penicillium sp in the non - natural environment
非自然環境中選育青黴菌菌種的研究 -
Mutation of maize natural hybrid and germ plasm material selection by ray irradiation
射線輻照天然雜種玉米的誘變作用及其在選育種質材料中的應用 -
Based on natural selection, it executes three same and simple genetic operators : selection, crossover and mutation. under the leading of fitness value, it makes an efficient searching in complex spaces until acquiring the best result
它基於自然選擇的原理，通過循環執行相同的、簡單的選擇、雜交和變異三種遺傳操作，並在適應度函數值的引導下對復雜的解空間進行有效地搜索，直到獲得最優的解。 -
Neutral mutation - - evolution at the molecular level is primarily determined by mutational input and random genetic drift, rather than by natural selection
天然突變- -演化過程中在分子的層次上主要是經由隨機的基因流而決定，並非藉由天擇所影響。 -
At first, in order to prevent the premature convergence of genetic algorithm effectively, the author brings forward a novel dyadic floating - point supplementary mutation operator. then, simulating the natural evolution, the author presents a novel topology, unoriented - connected topology, for parallel genetic algorithm. in the end, an interval decomposed optimization method is brought forward for ipga, which can improve the optimization performance of the algorithm
為提高演算法的性能，作者對遺傳演算法進行三種改進：首先，為克服遺傳演算法早熟收斂，作者提出一種新的二元浮點補碼變異運算元；其次，模擬生物自然進化模式，為并行遺傳演算法提出了一個新的并行拓撲結構- - - -無定向拓撲連接；最後，作者提出一種區間分解優化思想，來提高對最優解的搜索能力。 -
In this study, systems of rapid propagation of the cultivars such as d. zingiberensis, d. panthaica and d. composite were setup to find the best way to meet the need of producing, and to establish the base of introduction, breeding and cultivar improvement of foreign dioscorea with high diosgenin ; in addition, there are two strategies to obtain polyploids combining with chromosome engineering : screeding natural mutations and mutation breeding were carred out on d. zmgiberensis. exploratively studies were done on rapid propagation of the three dioscorea plants. the result showed : explants of d. pathaica obtained the appreciate propagation efficency on ms + ba1. 0mg / l + naa0. 1mg / l, ms basic medium containing 6. 0mg - 1 ba, l. 0mg - 1 kt and sucrose at 30gl - 1 or 60g1 - 1 was the appreciate medium for microtuberization
三種薯蕷屬植物離體再生體系培養條件的探索試驗結果表明：黃山藥外植體適宜的增殖培養基為ms + ba1 . 0mg / l + naa0 . 1mg / l ，微型塊莖誘導為ms + ba6 . 0mg / l + kt1 . 0mg / l + 3蔗糖，高濃度的蔗糖含量（ 6 ）能提高微型薯蕷的誘導率，但對其誘導起關鍵作用的還是ba的濃度；菊葉薯蕷增殖效果較好的培養基為ms + ba1 . 0mg / l ，以ms培養基為誘導微型薯蕷的最佳選擇，誘導率可達50 ；盾葉薯蕷最適宜的增殖培養基為ms + ba2 . 0mg / l ，在誘導微型薯蕷的實驗中發現，當ba濃度為6 . 0mg / l和8 . 0mg / l時， 15d左右節間處膨大形成綠色圓球狀小塊，但繼續培養其上則開始分化芽。 -
This article used natural number encode, and did feasibility analysis. in connection with premature in genetic algorithm, this article adopted self - adapting adjustment crossover and mutation probability methods, and did simulation
本文採用自然數編碼的方式，並分析了可行性；針對演算法優化中出現的「早熟」現象，提出了採用自適應交叉、變異概率法，並進行了模擬。 -
Genetic algorithm ( ga ) is a kind of highly paralel, stochastic, global probability search algorithm based on the evolutionism such as natural selection, genetic crossover and gene mutation
遺傳演算法是一種基於自然選擇、遺傳雜效和基因變異等生物進化機制的高度并行、隨機、全局性概率搜索演算法。 -
It mimics darwinian natural selection, making " fitness " as determined by a formula applied to an individual the chief selector of individuals for survival and procreation, together with mutation
它模擬達爾文的自然選擇，還有變異，把「適應性」 （正如適用於個體的公式所決定的那樣）作為主要因素選擇生存繁衍和變異的個體。 -
Genetic algorithms mimic darwinian natural selection, where " fitness " selects individuals for survival, breeding, and, hence, adaptive mutation
遺傳演算法模仿達爾文的自然選擇，其中「適應性」選擇進行生存、繁殖以及由此而來的適應性變異的個體。 -
The mutation, contrast and heterogeneity of ecological interface between oasis and desert ecosystem increased. rare natural or non - regional mosaic of patch show obvious sensitivity to spatial scale, the change ratios of theirs area and perimeter are greater than large patch
同時通過測度敏感性檢驗，表明在尺度變換中，稀少的自然或隱域性斑塊鑲嵌體對空間尺度敏感性大，面積、周長等變化率大於大斑塊，隨尺度中度干擾則合併成較大的斑塊，隨尺度強烈干擾或隔離加強后最先消失。 -
Sequence analysis showed that, this fragment has a homology of 99 % to the previously reported choe from rhodococcus equi. after cloning and subcloning and three identical fragments were obtained from three independent pcr, lacking three continual bases ( ttc, encoding the pheamino acid ) compared with choe, thus it can be assumed that the new fragment, designated as choew, and choe belong to the same gene family, even it might be the natural mutation of choe
對片段進行克隆、亞克隆之後測序分析，發現與已克隆的來源於馬紅球菌的膽固醇氧化酶基因cboe有99的同源性；並且三次獨立的pcr均得到相同的片段，所克隆的基因序列與choe相比，連續缺失三個堿基（ ttc ） ，即相應的氨基酸序列缺失一個氨基酸（ phe ） ，因此判斷所克隆的基因片段與choe屬同一基因家族或原有基因的天然突變體，命名為choew 。 -
Natural properties of mutation, growth, and symmetry are drawn parallel to global social issues of cultural hybridization and development
把自然性的基因突變，發展和保持平衡與文化雜交和發展的全球性社會問題作一個比較。 -
Genetic algorithm is a global optimization search method, which is based on biological evolutionary mechanisms such as natural selection, heredity and mutation
摘要遺傳演算法是一種基於自然選擇和遺傳變異等生物進化機制的全局優化搜索演算法。 -
Now next step we have to think about the ten years treatment, ten years mutation rate is 10 percent, then 90 % percent can use a drug for 10 years, then you might change the so - called natural cause of diseases
但是我們要考慮的是10年長期的服藥，如果10年的變異率是10 % ，仍然在這10年裡面，我們90 %的藥物療效是用來抑制病毒復制，而且效果好，可以延緩俗稱的自然肝病病程進展。 -
Any random mutation in an intron that proved beneficial to the host organism would have been retained by natural selection
插入子內任何偶然的突變，只要對宿主有利，就會在天擇的篩選下保留。 -
A solution applying genetic algorithm to multiple sequence alignment was presentd after multiple sequence alignment research actuality was analysized. in this solution, some genetic strategies was designed for multiple sequence alignment problem. for example, coding, initial population, fitness function and the operations of natural selection, crossover and mutation
基於多序列比對研究現狀的分析，提出一種基於遺傳演算法的多序列比對解決方法，設計並實現了序列比對問題的遺傳編碼，初始群體生成方式，適應度函數計算以及選擇、交叉和變異三種重要遺傳操作的方式。 -
An optimizing method based on biological evolution - genetic algorithm is proposed to the problem of the construction process planning analysis. adapting the successful experience of path optimization problem, improved genetic operators are adopted : the sequence of numbers, which is arranged by the removal order of members, is assumed to represent a chromosome by natural code ; transforming baseline information of this problem into immune operators ; combining rank - based model with elitist model ; designing special crossover and mutation operators. the mathematical model for computer and special programs are provided in this paper
借鑒遺傳演算法在求解路徑優化問題上的成功經驗，應用了改進的遺傳運算元：採用自然數對結構去除構件進行編碼，將所求問題的基本信息轉換成免疫運算元，採用穩態最優保存策略和排序選擇方法相結合進行選擇，採用適用於本問題研究的特殊的交叉運算元和變異運算元，從而來討論在桁架結構施工路徑優化問題中使用遺傳演算法的可能性。
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