| 研究生: |
范文郎 Wen-Lang Fan |
|---|---|
| 論文名稱: |
細菌基因體隨機性的統計分析 Statistical analysis ofrandomness of bacterial genomes |
| 指導教授: |
李弘謙
Hoong-Chien Lee |
| 口試委員: | |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 物理學系 Department of Physics |
| 畢業學年度: | 92 |
| 語文別: | 中文 |
| 論文頁數: | 50 |
| 中文關鍵詞: | 細菌基因體 、指數分佈 、基因成長 、字串間隔 、準複製體 |
| 外文關鍵詞: | bacterial genomes, exponential distribution, quasireplicas, genome growth |
| 相關次數: | 點閱:12 下載:0 |
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生物體的遺傳與系統功能的資訊以特殊的編排方式儲存在DNA 列中,而人們很早就發現所有已定序完成的細菌全基因體中,字串出現頻率與隨機序列大不相同。隨機序列的字串應為隨機出現,故字串間隔自然呈指數分佈,實驗驗證亦然。細菌全基因體是高度不隨機的序列,經我們實驗證明,全基因體中幾乎所有字串間隔也都是指數分佈。這表示全基因體雖然非隨機序列,但她每一個字串卻幾乎都
是隨機無關聯的出現。這給了我們一個重要的全基因體形成的訊息。而謝-李為了要解釋全基因體字串出現頻率分佈的譜寬,提出了一種全基因體的生長模型,這種模型的主要機制,是基因體以最高度的隨機片段複製生成。在這種機制下生長的序列,其短字串在序列中幾乎是不關聯的隨機出現,所以可以預測它們的間隔呈指數分佈。這與細
菌全基因體中性質相同。
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