selection by mutation 中文意思是什麼

selection by mutation 解釋
誘變育種
  • selection : n. 1. 選擇；挑選；選拔。2. 拔萃；選擇物；精選物[品]；文選。3. 【無線電】分離，（自動電話）撥號。4. 【生物學】選擇，淘汰。
  • by : adv 1 在側，在旁，在附近。2 （擱）在一邊，（放）到旁邊，（存）在一旁；收著。3 （由旁邊）經過，過...
  • mutation : n. 1. 變化,變異,更換；【生物學】突變；突變種；【語言學】母音變化；【音樂】（提琴的）變換把位；變聲；【法律】讓受。2. （人世的）浮沉,盛衰。
  1. Almost every morsel of our food is genetically modified - admittedly by artificial selection not artificial mutation, but the end result is the same

    我們吃的幾乎每一口食物都是轉基因的? ?通過人工選擇而不是人工突變，但是最終結果是相似的。
  2. Niger with phytase activity about 2250 u / ml which selected by protoplast - uv mutation was used as original, prepared it into fungu - suspend - liquid, through uv mutation, daub on the filter - substract. pre - primary - selection was according to the lucency - circle, primary - selection was one fungus inoculate one flask to ferment, secondary - selection was using several high phytase activity fungus through one fungus inoculate 2 - 3 flasks to ferment. then one or two high phytase activity fungus of the secondary selection were used in the next mutation cycle

    首先用粗略制備的原生質體經紫外誘變篩選到一株酶活為2250u ml的實驗出發菌；制備成菌懸液，紫外燈下照射誘變，紅光下塗抹篩選平板，恆溫培養2 3d ；按透明圈大小進行預初篩，挑選徑圈比大的菌落接斜面，恆溫培養3d ；按一株一瓶的方式進行初篩；從中選取酶活較大的3 5株，按一株2 3瓶的方式進行復篩；挑取酶活大且穩定的1 2株進入下一代誘變篩選。
  3. 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
  4. 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。
  5. Better segmentation effect can be attained by coding gray levels of pixels as eigenvector, taking advantage of histogram entropy principles function as fitness function, adopting ranking selection operation, making use of arithmetic crossover and mutation at a certain probability, combining with clustering analysis to initialize clustering center of the population to segment cells image with genetic algorithm

    以像素的灰度值為特徵向量進行編碼，利用直方圖熵法準則函數作為適應度函數，採用基於排名的選擇操作，以一定的概率進行算術交叉和變異，並結合聚類分析設定種群的聚類中心對細胞圖像進行遺傳聚類分割。
  6. 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。
  7. This paper, firstly, expatiates the content and sense about optimal design of water supply networks, briefly introduces all optimal methods which have been advanced, analyzes these methods and points out their limitation, summarizes the factors which influence the results in optimal design of water supply networks ; secondly, it introduces the principle of genetic algorithms ( ga ). it takes yearly expenditure converting value as target function and sets up the ga model on optimal design of water supply networks based on sga by means of taking some effective measures on selection operator, crossover operator, mutation operator and some parameters setting ; finally, the ga model is verified by its application on engineering project

    本文首先闡述了給水管網優化設計的內容和意義，簡要介紹了已有的優化方法，分析比較了各種優化方法並指出其存在的不足，歸納總結了影響給水管網優化設計結果的各種因素；接著，介紹了遺傳演算法的基本原理，然後在標準遺傳演算法的基礎上，通過對選擇運算元、交叉運算元、變異運算元以及部分參數的設置採取改進措施，並以年費用折算值為目標函數，建立了給水管網優化設計的遺傳演算法模型；最後，通過工程實例驗證了該模型具有一定的理論和應用價值。
  8. 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。
  9. This paper, firstly, expatiates the content and sense about optimal design of water supply networks, briefly introduces all optimal methods which have been advanced, analyzes these methods and points out their limitation, summarizes the factors which influence the results in optimal design of water supply networks ; secondly, it introduces the principle of genetic algorithms. it takes yearly expenditure converting value as target function and sets up the genetic algorithms model on optimal design of water supply networks based on simple genetic algorithms by means of taking some effective measures on selection oper ator, crossover operator, mutation operator and some parameters setting ; finally, the genetic algorithms model is verified by its application on engineering project

    簡要介紹了已有的優化方法，分析比較了各種優化方法並指出其存在的不足，歸納總結了影響給水管網優化設計結果的各種因素；接著，介紹了遺傳演算法的基本原理，然後在標準遺傳演算法的基礎上，通過對選擇運算元、交叉運算元、變異運算元以及部分參數的設置採取改進措施，並以年費用折算值為目標函數，建立了給水管網優化設計的遺傳演算法模型；最後，通過工程實例驗證了該模型具有一定的理論和應用價值。
  10. When the genetic algorithm is implemented it is usually done in a manner that involves the following cycle : evaluate the fitness of all of the individuals in the population. create a new population by performing operations such as selection, crossover and mutation on the individuals whose fitness has just been measured. discard the old population and iterate using the new population

    遺傳演算法是通過下面簡要步驟的循環最終獲得優化問題的解的：隨機生成一定數目的個體構成初始群體，計算群體中每個個體的適應度，使用遺傳操作即選擇、交叉、變異運算元產生新一代群體然後代替上?代群體并迭代執行。
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