Scientists have written what they believe is the world's smallest periodic table - on a strand of human hair.
科学家在人的一根头发上刻出了他们相信是世界上最小的元素周期表。
The researchers don't read every single base on a strand of DNA, but they look for distinctive patterns of repetition of a single, very short sequence.
虽然研究员不辨认一股DNA链的每一个单独的碱基,但是他们寻找一个单独的非常短的序列的重复的特殊模式。
There's some variation depending on hair colour but for an average adult the strand count is 100,000, so losing 100 a day is not too bad.
不同的发色会有不同的变化,但是对于一个普通的成年人来说,头发的数量是10万根,所以每天失去100根也不是太糟糕。
"Welcome to the Bead Bar,Orlando Florida. My name is Sonia and on this segment for Expert Village we are going to show you how to do a multiple strand necklace.
VOA: special.2009.05.18
You then denature again, each one of these strands gets separated, primers bind, turn on the polymerase, a new strand is made.
然后你可以再次使产物链变性,使各链解旋,再结合引物,激活聚合酶,再生成新链
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