VOA标准英语2013--High-Tech Images Show How Viruses Infect Cells
时间：2018-12-16 作者：英语课 分类：VOA标准英语2013年(一月)
High-Tech 1 Images Show How Viruses Infect Cells
At the University of Texas Medical School at Houston, Jun Liu uses a powerful electron microscope to examine E. coli bacteria and the tiny T-7 virus that infects them.
Liu says until now, scientists could only speculate on how this virus injected its genetic 2 material into another cell, because it happens in an instant.
“Before they inject in, they do not have a channel. After they inject in, they actually degrade the channel, so you never have a chance to see it,” Liu said.
But in a collaborative study with other University of Texas colleagues, Liu used the electron microscope to examine quick-frozen solutions full of bacteria and viruses.
“Because when you freeze it, it is kind of like a snapshot that captures some intermediate stage. This is one of the highlights of this study, because we captured this intermediate stage that nobody had seen before,” Liu said.
This sophisticated technology was applied 3 to a particular virus in this study, but what the researchers found could be useful in studying other viruses in the future, viruses that cause many diseases, such as influenza 4, or AIDS.
That is the hope of study participant Ian Molineux, professor of biology at the University of Texas main campus in Austin, who prepared the virus samples used in the study.
“If we can find a way of blocking any of multiple steps towards the final internalization of the genetic material, it provides the potential for finding more anti-viral drugs,” Molineux said.
An animation 5, produced for Science magazine by the American Association for the Advancement 6 of Science, shows how the virus puts out tendrils to, in effect, “walk” on the cell surface.
"Then it stops moving and all the legs come down and get fixed 7 on the cell surface, and the infection begins to initiate," Molineux said.
Molineux says the collaborative effort with Liu and others paid off, with each member of the team bringing his own area of expertise 8 into play.
“We have a very strong collaboration 9. We are looking at other viruses now,” Molineux said.
He says each advance in understanding how viruses function brings researchers closer to finding ways to defeat them - and save lives.
- The economy is in the upswing which makes high-tech services in more demand too.经济在蓬勃发展，这就使对高科技服务的需求量也在加大。
- The quest of a cure for disease with high-tech has never ceased. 人们希望运用高科技治疗疾病的追求从未停止过。
- It's very difficult to treat genetic diseases.遗传性疾病治疗起来很困难。
- Each daughter cell can receive a full complement of the genetic information.每个子细胞可以收到遗传信息的一个完全补偿物。
- She plans to take a course in applied linguistics.她打算学习应用语言学课程。
- This cream is best applied to the face at night.这种乳霜最好晚上擦脸用。
- They took steps to prevent the spread of influenza.他们采取措施
- Influenza is an infectious disease.流感是一种传染病。
- They are full of animation as they talked about their childhood.当他们谈及童年的往事时都非常兴奋。
- The animation of China made a great progress.中国的卡通片制作取得很大发展。
- His new contribution to the advancement of physiology was well appreciated.他对生理学发展的新贡献获得高度赞赏。
- The aim of a university should be the advancement of learning.大学的目标应是促进学术。
- Have you two fixed on a date for the wedding yet?你们俩选定婚期了吗？
- Once the aim is fixed,we should not change it arbitrarily.目标一旦确定，我们就不应该随意改变。
- We were amazed at his expertise on the ski slopes.他斜坡滑雪的技能使我们赞叹不已。
- You really have the technical expertise in a new breakthrough.让你真正在专业技术上有一个全新的突破。
- The two companies are working in close collaboration each other.这两家公司密切合作。
- He was shot for collaboration with the enemy.他因通敌而被枪毙了。