who told you that there are only 3 billion combinations of DNA sequences... invalid to start with. There are about 3 billion base pairs in a given person, naturally there...
...。火力發電 27618MW。合計 裝機容量 37372 MW。 發電量 ( billion Watt hour):水力發電 7831 BWh。核能發電 37971 BWh。地熱...
...新聞,資料來源如下: http://news.bbc.co.uk/1/hi/world/676064.stm One billion of them have no access to safe water at all...
..., a professor of paleobiology at UCLA, described 3.5 billion -year-old specimens from Western Australia as ...
...多少皮克戴奧辛的量。 ppt(part per trillion):指兆分之一的戴奧辛含量。 ppb(part per billion ):指十億分之一的戴奧辛含量。 pg/kg-bw:指成人每公斤體重(bodyweight)含多少皮克...
...000 001 0,000 000 000 000 000 000 000 001septillion sextillion quintillion quadrillion trillion billion million thousand hundred ten tenth hundredth thousandth ...
...傾力於人類基因序列解碼工作,原訂工作時間是1995年到2005年,結果人類30億 (3 billion ) 個鹼基序列的解碼工作,已於2000年完成。人類基因序列解碼工作完成後,正式...
25℃=273+25=298K=25*(9/5)+32=77度F ppm是Parts Per Million的簡寫,ppb是Parts Per Billion 的簡寫, 1ppm=1/10^6,1ppb=1/10^9, 所以1ppm=0.0001%=1000ppb