官方APP下载:英语全能特训(微信小程序版,支持苹果手机、安卓手机)
创办于2003年
UNSV记不住?那就记中文谐音“忧安思危”吧!
  Slow and Steady Wins the Race!
UNSV英语学习频道 - Slow and steady wins the race!
公众微信服务号
英语全能特训(微信公众服务号)
UNSV英语学习频道淘宝网店
客服短信:18913948480
客服邮箱:web@unsv.com
初级VIP会员
全站英语学习资料下载。
¥98元/12个月

AGRICULTURE REPORT - Growing Rice and a Cholera Vaccine at the Same Time

阅读次数:


VIP会员专享下载:(非VIP会员无权下载!如果想下载,但还不是VIP会员,请点此订购
下载方式:使用鼠标右键(注意是鼠标右键!)点击下面的MP3音频/MP4视频链接,然后选择“另存为…”。
MP3节目录音 MP3节目录音  PDF节目文稿 PDF节目文稿 
文章正文
同步字幕

This is the VOA Special English Agriculture Report.

Someday, rice plants might not only provide food but also a way to prevent cholera and other diseases.

Cholera is a bacterial infection of the intestines. Today it is found mostly in Africa, Asia and Latin America. Current vaccines to protect against cholera must be kept in cold storage. The need for refrigeration limits use in poor countries.

But research in Japan may lead to rice plants that contain a cholera vaccine that does not need to be kept cold. So far, the research has been carried out only on mice. The Proceedings of the National Academy of Sciences in the United States published the study earlier this month.

Hiroshi Kiyono of the University of Tokyo and his team experimented with genetic material from the bacterium responsible for cholera. They placed it into the Kitaake rice plant.

Mice ate the genetically changed rice seeds as a powder. The report says the vaccine was not destroyed by stomach acid; instead, the animals developed antibodies against the cholera toxin. The scientists say the vaccine remained active even after being stored at room temperature for more than a year and a half.

People would take the vaccine as a drug that contains the powder.

Cholera is usually spread through water or food, in places where conditions are dirty and drinking water supplies are unsafe. Cholera infections are often mild. But some people develop severe cases. The World Health Organization says half of them will die if they are not treated.

The researchers say the experimental cholera vaccine produced reactions in the immune system and in areas of mucosal tissue. Mucosal surfaces include the mouth, nose and reproductive organs. Cholera as well as viruses like those that cause influenza and AIDS infect these areas.

The scientists have great hopes for rice-based vaccines as a way to protect large populations against mucosal infections. There would be no need for injection, since the vaccine would be taken by mouth.

Yet scientists have tried for some time to make plant-based vaccines. Researchers in the United States have developed one for Newcastle disease in chickens, but so far there are no products for humans. At the same time, scientists have to deal with concerns about genetically engineered plants accidentally mixing with food crops.

And that's the VOA Special English Agriculture Report, written by Jerilyn Watson.

网友的学习评论(0条):
版权所有©2003-2019 南京通享科技有限公司,保留所有权利。未经书面许可,严禁转载本站内容,违者追究法律责任。 互联网经营ICP证:苏B2-20120186
网站备案:苏ICP备05000269号-1中国工业和信息化部网站备案查询
广播台