2007年VOA标准英语-US Scientists Make Important Discovery in Battl
时间：2019-01-06 作者：英语课 分类：2007年VOA标准英语（九月）
Washington
14 September 2007
University scientists in the United States have taken what they say is an important step in the effort to end malaria 1. At Johns Hopkins Malaria Research Institute, scholars recently identified a sugar in mosquitoes that helps explain, for the first time, the mechanism 2 of the malaria parasite 3 invasion. The finding could be a key element for a vaccine 4 development in the fight against malaria. Producer Zulima Palacio spoke 5 with the authors of the research and files this report. Carol Pearson narrates 6 it.
Malaria is spread by mosquitoes
"I am removing the males only, because the males are not important to our research work. Males do not blood feed, they feed on sugar only," says researcher Rhoel Ramos Ding-lasan. He is dissecting 7 the type of mosquito that transmits the malaria parasite that kills about three million people each year around the world. Experts report the understanding and control of the malaria parasite is one of the most serious scientific challenges of all time.
This week, scientists at the Johns Hopkins Malaria Research Institute announced they identified a sugar in mosquitoes that the malaria-causing parasite [Plasmodium falciparum] needs. The sugar is essential in the parasite's movement within the midgut section of a mosquito's body.
"This is the mosquito gut 8, filled with blood," demonstrates Professor Marcelo Jacobs-Lorena, the senior author of the research. He says that by stopping the production of that sugar, the parasite dies. "The second step, which was a definite proof, was to -- by genetic 10 means -- interrupt sugar production. So we infected those impaired 11 mosquitoes with the parasite and we found that, indeed, the parasite was unable to traverse the midgut."
But the scientists say it is difficult to treat the mosquitoes in nature. They suggest a human vaccination 12 with antibodies that would block sugar production in the mosquito. When a mosquito feeds on human blood, it would ingest the antibody.
The new finding brings scientists one-step closer to developing effective malaria vaccines 13.
Jacobs-Lorena adds,"The best hope we have is that we have a combination of transmission blocking vaccine that the antibody works in the mosquito stage, combined with infection blocking, so that people are protected."
Now 20 years into his work, Jacobs-Lorena says it will take 10 to 15 more years to find practical applications. Still, he says this new study -- along with research on mosquito gene 9 modication -- puts scientists closer every day to eradicate 14 malaria.
- He had frequent attacks of malaria.他常患疟疾。
- Malaria is a kind of serious malady.疟疾是一种严重的疾病。
- The bones and muscles are parts of the mechanism of the body.骨骼和肌肉是人体的组成部件。
- The mechanism of the machine is very complicated.这台机器的结构是非常复杂的。
- The lazy man was a parasite on his family.那懒汉是家里的寄生虫。
- I don't want to be a parasite.I must earn my own way in life.我不想做寄生虫，我要自己养活自己。
- The polio vaccine has saved millions of lives.脊髓灰质炎疫苗挽救了数以百万计的生命。
- She takes a vaccine against influenza every fall.她每年秋季接种流感疫苗。
- They sourced the spoke nuts from our company.他们的轮辐螺帽是从我们公司获得的。
- The spokes of a wheel are the bars that connect the outer ring to the centre.辐条是轮子上连接外圈与中心的条棒。
- It narrates the unconstitutional acts of James II. 它历数了詹姆斯二世的违法行为。 来自辞典例句
- Chapter three narrates the economy activity which Jew return the Occident. 第三章讲述了犹太人重返西欧后的经济活动。 来自互联网
- Another group was dissecting a new film showing locally. 另外一批人正在剖析城里上演的一部新电影。 来自辞典例句
- Probe into Dissecting Refraction Method Statics Processing under Complicated Surface Conditions. 不同地表条件下土壤侵蚀的坡度效应。 来自互联网
- It is not always necessary to gut the fish prior to freezing.冷冻鱼之前并不总是需要先把内脏掏空。
- My immediate gut feeling was to refuse.我本能的直接反应是拒绝。
- 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。
- 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。
- Much reading has impaired his vision. 大量读书损害了他的视力。 来自《现代汉英综合大词典》
- His hearing is somewhat impaired. 他的听觉已受到一定程度的损害。 来自《现代汉英综合大词典》
- Vaccination is a preventive against smallpox.种痘是预防天花的方法。
- Doctors suggest getting a tetanus vaccination every ten years.医生建议每十年注射一次破伤风疫苗。
- His team are at the forefront of scientific research into vaccines. 他的小组处于疫苗科研的最前沿。
- The vaccines were kept cool in refrigerators. 疫苗放在冰箱中冷藏。