【英语时差8,16】泥土的味道
时间：2019-02-23 作者：英语课 分类：英语时差8，16
- 1 【英语时差8,16】泥土的味道
A lot of people love that fresh-dirt smell. The surprising thing, though, is that it isn’t coming from the dirt itself. Microbiologists have traced the pleasant odor to an organic chemical called “geosmin.” A microbial geneticist named Keith Chater at the John Innes Center in England has traced geosmin down to a common bacterium 2 called Streptomyces coelicolor. He even found out exactly which gene 1 in the little critters causes them to produce geosmin. Interestingly enough, there are unconfirmed reports that animals are attracted to fresh dirt in the desert, and go there looking for water. As they nose around the dirt, they pick up plenty of S. coelicolor, which then hitch 3 a ride from one oasis 4 to the next. If it’s true, then the bacteria in general may create the odor in order to attract animals. The animals find water, the bacteria are spread, and everyone is happy.
- A single gene may have many effects.单一基因可能具有很多种效应。
- The targeting of gene therapy has been paid close attention.其中基因治疗的靶向性是值得密切关注的问题之一。
- The bacterium possibly goes in the human body by the mouth.细菌可能通过口进入人体。
- A bacterium is identified as the cause for his duodenal ulcer.一种细菌被断定为造成他十二指肠溃疡的根源。
- They had an eighty-mile journey and decided to hitch hike.他们要走80英里的路程，最后决定搭便车。
- All the candidates are able to answer the questions without any hitch.所有报考者都能对答如流。