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腾讯网
2d
DNA结构,不只有双螺旋
实际上,DNA除了双螺旋结构,还可以形成其他的非B型DNA结构(图一B-G),包括左手双螺旋的Z DNA(B)、鸟嘌呤富集区域形成的G-四链体(G-quadruplex)(C)、DNA串联重复错配形成的Slipped ...
13d
on MSN
庞贝古城的新DNA证据挑战了人们长期以来对古罗马的看法
新的DNA庞贝古城人体铸模证据显示,关于居民关系和出身的传统假设往往是不正确的,相反,这些证据显示了植根于地中海东部的多样化人口。公元 79 年,意大利南部的索玛-维苏威火山系统爆发,吞没了罗马城镇庞贝及其居民。 这场灾难性事件使整个地区被火山灰覆盖,许多尸体和建筑都被保存在火山灰下。庞贝古城的人体铸模。 图片来源:庞贝考古公园现在,从著名的尸体铸模中收集到的古老 DNA 改变了自 1700 年代 ...
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