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zcp1211小窝

已采纳

happy,pleasure,glad

e2eti英文论坛

338 评论(8)

miumiu大酱

对。Ti是在根瘤土壤杆菌细胞中存在的一种染色体外自主复制的环形双链DNA分子。它控制根瘤的形成,可作为基因工程的载体。Ti是英文肿瘤诱发(tumor-inducing)的缩略式。

Ti质粒 Ti plasmid 为植物根癌土壤杆菌(Agrobactertium tumef-aciens)菌株中存在的质粒,其特定部位与植物核内DNA组合来表达信息,使植物细胞肿瘤化。即此质粒既有在细菌中表达的基因,又有在高等植物中表达的基因,这是很独特的。该质粒其大为90-150×106道尔顿,其与植物DNA结合的部分(称为 T-DNA)约15×106道尔顿。在此处有支配肿瘤化及维持肿瘤状态和产生opine的基因。在T-DNA以外的区域,存在着对质粒的传递性、opine的透过和分解等(在细菌中表达的性状)的基因。通过opine所诱导的接合,可被传递于土壤杆菌属(Agrobacterium)和根瘤菌属(Rhizobium)细菌。另外对于T-DNA部分从细菌细胞移于植物细胞的机制并不清楚。已知有四个类群,根据opine的种类而分别称为章鱼〔肉〕碱型、胭脂碱(nopaline)型、农杆碱(Agropine)型和琥珀碱(Succinamopine)型。

255 评论(10)

天堂的阶梯

1-10 one two three four five six seven eight nine ten 11-20 eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen twenty 21-29 twenty-one twenty-two twenty-three twenty-four.... 30-39 thirty thirty-one thirty-two .... 40-49 forty forty-one forty-two forty-three.... 50-59 fifty fifty-one fifty-two fifty-three..... 60-69 sixty sixty-one sixty-two sixty-three..... 70-79 seventy seventy-one seventy-two ..... 80-89 eighty eighty-one eighty-two eighty-three.... 90-99 ninety ninety-one ninety-two ninety-three... 100 one hundred

130 评论(15)

黄小琼琼

一、merry英 ['meri] 美 ['meri] adj. 愉快的;欢乐的;<口>微醉的示例:There is a merry smile on her face.她脸上露出愉快的微笑。二、joyfulness英 ['dʒɔɪflnəs] 美 ['dʒɔɪflnəs] n. 欢喜;高兴;快乐示例:Those who have worked with you will miss your joyfulness.与你共过事的人会想念你的快乐。三、joviality英 [ˌdʒəʊvi'æləti] 美 [ˌdʒəʊvi'æləti] n. 快乐;高兴;愉悦示例:Certainly, this cry-and-laugh monstrosity also contains the whole stimulation and joviality in a defensive game.当然,这一令人泣笑皆否的怪异,也由此包含了一种对抗性游戏的全部刺激与愉悦。四、happy 英 [ˈhæpi] 美 [ˈhæpi] adj.感到(或显得)快乐的;高兴的;给予(或带来)快乐的;使人高兴的;幸福的;表示祝愿示例:We are happy to announce the engagement of our daughter.我们高兴地宣布,我们的女儿已订婚。五、cheerful 英 [ˈtʃɪəfl] 美 [ˈtʃɪrfl] adj.快乐的;高兴的;兴高采烈的;令人愉快的示例:You're not your usual cheerful self today.你今天不像往常那么快快乐乐的。

110 评论(12)

MM头Selina

1. one:[wʌn]2. two: [tu:] 3. three :[θri:]4. four:[fɔ:] 5. five [faiv] 6. six [siks] 7. seven:['sevn]8. eight:[eit]9. nine [nain] 10.ten [ten] 11.eleven :[i'levn] 12.twelve :[twelv]13.thirteen :['θə:ti:n] 14.fourteen :['fɔ:'ti:n]15.fifteen :['fif'ti:n]16.sixteen :['siks'ti:n]17 seveteen :[,sevn'ti:n]18 eighteen:['ei'ti:n] 19.nineteen :['nain'ti:n]20~29.twenty ['twenti] twenty-one twenty-two twenty-three twenty-four twenty-five twenty-six twenty-seven twenty-eight twenty-nine 30~39.thirty:['θə:ti]thirty-one thirty-two thirty-three thirty-four thirty-five thirty-six thirty-seven thirty-eight thirty-eight thirty-nine 40~49.forty:['fɔ:ti]forty-one forty-two forty-three forty-four forty-five forty-six forty-seven forty-eight forty-nine 50fifty:['fifti]

165 评论(12)

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