题型:阅读理解 题类:常考题 难易度:普通
宁夏石嘴山市第三中学2016-2017学年高一下学期期末考试英语试卷
As we know, DNA testing is very useful for crime fighting. But now crime fighters could have a new tool at hand. Researchers have developed a cutting-edge (前沿的) technique to identify human hair. Their test is quicker than DNA analysis techniques currently used by the police.
DNA testing is commonly used for identification because DNA is unique to each individual. However, environmental and chemical processes can degrade(降解) DNA, limiting its usefulness over time. Protein (蛋白质) in hair, on the other hand, is more stable than DNA but can also have variations (变异体) that may be unique to the individual.
“Our analysis process can be used universally, ”says Ms. Huang, “One of our samples even included dyed hair and the test was 100 per cent accurate. The test was able to distinguish East Asians, Caucasians and South Asians.”
Dr. Beauchemin says she has got in touch with law enforcement agencies about using the new technology. She is also planning to collect more hair samples and continue her research with a goal of finding where exactly in the world hair sample is from, to look for more races and determine specific age.
“We are in a very similar place with protein-based identification to where DNA testing was during the early days of development,” said chemist Brad Hart. “This method will be a game-changer, and while we've made a lot of progress toward improving it, there are steps to go before this new technique is able to reach its full potential.”
Emerald Coast Science Center Field Trips
Bring your group or class to explore our hands-on Science Center now which provides wonderful learning opportunities for students all along the Emerald Coast!
Hands-on funEvery field trip includes a Makerspace activity and a 30-minute close encounter with our animals under the guidance of an educator.Lessons for all ages Lessons can be changed to suit the needs of most grade levels and include knowledge of different areas. But remember: such lessons charge an additional fee and must be planned in advance. For a list of the types of field trip lessons we currently offer, please click here to download our Education Program Guide. | Pricing information●$12 per student;1 free guardian every 10 students, additional guardians $6 each; teachers are always free. ●Minimum fee of $120 per field trip. ●Same-day field trips are limited to up to 105 students. ●The group for field trips that does not arrive within 30 minutes past their scheduled arrival time will be charged a $100 service fee to accommodate scheduling issues. ●No Show/No Call bookings are charged a $100 cancellation fee. ●Okaloosa County only: Up to 6 free economically disadvantaged students per booking. |
To book a field trip, please call Lisa at 850-664-1261. Please choose your preferred date and two alternate dates you would like to book before calling. We will email you a confirmation of your booking.
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