…DNA consisting of two strands that are not completely complementary is called a heteroduplex, and the non-complementary parts can be detected by an electron microscope. When a thread is tightly twisted, it wraps around itself to form a superhelical structure, and the same thing happens with DNA. In fact, most circular DNA extracted from cells has a superhelical structure. In this case, the direction of the twist is usually the direction that unwinds the double helix. … *Some of the terminology that refers to "circular DNA" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…完全に相補的ではない2本鎖から成るDNAは,ヘテロデュプレックスheteroduplexと呼ばれるが,その相補的でない部分を電子顕微鏡などで検出することができる。 糸を強く撚(よ)ると,糸は自分自身の周りに巻きついて超らせん構造を形成するが,DNAでも同様のことが起こり,現に細胞から抽出した環状DNAはほとんどが超らせん構造をとっている。この場合,撚りの方向は通常,二重らせんをほどく向きである。… ※「環状 DNA」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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