b-chromosome 中文意思是什麼
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In addition to avermectins, s. avermitilis produces oligomycin, a strongly toxic compound. gene deletion vector pxl05 was used to disrupt oligomycin polyketide synthase ( pks ) encoding genes ( olma ) in streptomyces avermitilis cz8 - 73, the producer of anthelmintic avermectins b and the cell growth inhibitor oligomycin. olma gene cluster in the chromosome was displaced by deletion allele on the plasmid via double crossover
本研究以產阿維菌素b和寡黴素的阿維鏈黴菌cz8 - 73為出發菌株，構建了基因缺失載體pxl05 ，並將其轉入cz8 - 73中，通過缺失載體和染色體之間的同源雙交換，對染色體上長達90kb的寡黴素聚酮合酶（ pks ）基因簇（ olma ）進行了缺失。 -
However, only three species of the cephalochordate including b. lanceolatum, b. floridae, and b. belcheri, have so far been studied for their chromosome numbers, and the karyotypic analysis and banding study of amphioxus chromosomes remains largely untouched
Floridae 、 b belcheri三種文昌魚染色體數目。有關文昌魚染色體核型和帶型的研究尚未見任何報道，文昌魚染色體核型和帶型的研究將為比較基因組學和細胞遺傳學研究提供珍貴的背景資料。 -
This showed that the diploid chromosome number ( 2n ) of amphioxus b. belcheri tsingtauense was 36. the chromosomes were extremely small, ranging from 1. 4 to 3. 7 um in length. the first pair of the 36 chromosomes of b. belcheri tsingtauense was subtelocentric and the other 17 pairs telocentric. neither metacentric nor submetacentric chromosomes nor satellites were observed
在36條染色體中，除第一對染色體屬亞端部著絲粒染色體（ st ）外，其餘均為端部著絲粒染色體（ t ） ，未見中部著絲粒染色體（ m ）和亞中部著絲粒染色體（ sm ）及隨體。 -
Studies on karyotypes wihin clones indicated that all the karyotypes belonged to stebbins ' 3b type. there are different karyotype formulas, polymorphsim of satellite chromosome, variations of chromosomal structure and b - chromosome in clones. chromosomal mutation is important factor of chromosomal structure variations within clones
無性系內核型研究表明：各無性系的核型類型都屬于st吮七us的m型、核型公式不完全川同、隨體染色體具多忐性，染色體存在結構變異，研究認為造成無性系內核型變異的重要原因是染色體突變。 -
3 ) the results of studying on the chromosomal mutation and mitosis of the wheat irradiated by uv - b indicated that the rate of mitosis was inhabited by uv - b radiation ( 10. 08 kj ? m " 2 ? d " 1 ) in wheat cells, and some types of chromosome aberration were induced
（ 3 ）對染色體及細胞分裂的研究結果表明，增強uv - b輻射能抑制小麥細胞的有絲分裂率，產生落後染色體、染色體橋、游離染色體、核變形等畸變。 -
Under the condition of the enhanced ultraviolet - b radiation, the phenomenon of abnormal mitosis was first discovered, such as the three - bundle > four - bundle and six - bundle division of the chromosome when the cell is in anaphase
並在uv - b誘導的小麥根尖細胞中，首次發現染色體在有絲分裂的後期到末期，分成3束、 4束和6束等異常分裂新類型。 -
Further study showed that aii protein was a kind of non - secreted protein, and aii gene was located on the chromosome of b. thuringiensis or b. cereus
研究中還發現，蘇雲金芽胞桿菌aii蛋白是一種非分泌型蛋白。 -
As cyclin b is the mark protein representing the process of prophase, we infered that cytochalasin b destroyed the polymerization of the nuclear actin and directly affected the process of prophase. nuclear actin played an important role in the process of the chromosome construction
因為cyclinb是有絲分裂前期進程的標志性蛋白，所以我們認為細胞鬆弛素b破壞細胞核內肌動蛋白聚合后，直接影響了有絲分裂前期的進程，進而悅明核內肌動蛋白在有絲分裂前期染色體構建過程中起著重要作用。 -
And the two pah ' s of pcr primers that bind to the adapter and the sequence of f fragment close by tn5 respectively were also designed. the genomic dna of b8 was isolated, digested with bamh i, and ligated to the adapter. using the two pairs of the primers, two rounds of pcr were performed hi turn and a fragment of 239bp was amplified successfully. lt was proved by cloning and sequencing that 18bp of the fragment is the sequence opposite to f fragment on the left of tn5 insertion site in b8f, the other is part of the 728 bp of f fragment. this result makes it possible to continue to carry out chromosome walking, to clone and sequence the whole genes of b fragment and f fragment, and to reveal the antagonistic molecular mechanism of b8
試驗研究設計併合成了由40和44個堿基的寡聚脫氧核苷酸組成的染色體爬行接頭，在接頭序列和測定的f片段近tn5的序列上，設計了2對染色體爬行用的pcr引物，從b8菌株中提取基因組dna ， bamhi酶切，與染色體爬行接頭連接，依次用2對引物進行pcr ，擴增出239bp產物，經克隆、測序，發現其中18bp為擴增的相應于f片段在b8f菌株tn5插入位點對面的序列，其餘則為f片段728bp序列的一部分，為進一步進行染色體爬行，克隆和測定整個b和f基因，揭示陽菌株的拮抗分子機制提供了技術資料貯備。
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