日韩精品久久一区二区三区_亚洲色图p_亚洲综合在线最大成人_国产中出在线观看_日韩免费_亚洲综合在线一区

您現(xiàn)在的位置: > Language Tips > Audio & Video > Special Speed News  
 





  Scientists clone pigs to make omega-3 fatty acids
[ 2006-04-07 09:32 ]

I’m Faith Lapidus with the VOA Special English Agriculture Report.

Scientists say they have developed pigs that produce omega-three fatty acids . These fatty acids are believed to help fight heart disease. But it could be some time before these experimental pigs go to market.

The animals are clones, genetic copies of each other. The Food and Drug Administration has never approved a cloned animal for use as food. Still, some people believe Americans might someday buy the new pork if they see it as heart-healthy.

Professor Jing Kang at Harvard Medical School took the first step in the work that led to the cloned pigs. His research suggests that no mammal naturally produces omega-three fatty acids. So Doctor Kang genetically engineered mice with a gene that can create them from another fatty acid.

He took the gene from a kind of small worm that scientists have studied for years. Doctor Kang published his findings with two other researchers in 2004.

This research led the way for Randall Prather at the University of Missouri to clone pigs that can do the same thing. Pigs have been cloned before, but not for a purpose like this. Last month, Nature Biotechnology published a report describing how the experiment was done. Seventeen scientists took part in the study.

Fatty acids are the building materials of fat. Omega-three fatty acids are believed to reduce the risk of heart disease. They are also thought to reduce levels of harmful cholesterol in the blood.

The human body can make most kinds of fat by itself out of sugars. But it cannot make omega-three or omega-six fatty acids. These must come from foods or dietary supplements.

But it is still not clear how soon genetically engineered animals might be approved for Americans to eat. Some people would have no concerns about eating meat produced through biotechnology. Others, though, say they see the idea as a step too far removed from nature.

This new research is aimed at producing pigs with a healthier form of fat.

Fat gives flavor. But in the United States, pork producers have cut the fat, hoping to appeal to people worried about heart disease. Twenty years ago the industry launched a marketing campaign comparing pork to chicken. It called pork "the other white meat."

Now the National Pork Board has a new marketing campaign. The aim is to get Americans to think of pork as a way to add a little excitement to dinner. The message: "Don't be blah."

This VOA Special English Agriculture Report was written by Mario Ritter. I'm Faith Lapidus. 


fatty acid : 脂肪酸

 
 
 




主站蜘蛛池模板: 亚洲一区国产二区 | 久久999视频 | 蜜臀在线视频 | 欧美一级永久免费毛片在线 | 乱码中文字幕人成在线 | 黄色网址免费入口 | 欧美午夜免费观看福利片 | 国产精品成人在线观看 | 精品一区二区三区免费视频 | 日韩字幕无线乱码 | 久久久久综合 | 欧美精品九九99久久在观看 | 日本无码成人片在线观看波多 | 亚洲一区中文字幕在线观看 | 欧美日韩综合一区 | 播五月婷婷 | 成人毛片视频免费 | 日韩不卡免费视频 | 看一下毛片 | 蜜桃视频在线播放 | 奇米影视第四色在线 | 91短视频免费 | 国产一区二区久久精品 | 国产一区二区三区在线 | 哪里可以看免费的av | 亚洲国产欧美久久香综合 | 精品美女| 国产大片在线观看 | 国产亚洲一级精品久久 | 99午夜高清在线视频在观看 | 国语一级毛片 | 久久综合婷婷香五月 | 国产欧美精品午夜在线播放 | 亚洲一区二区三区在线视频 | 精品国产欧美一区二区 | 欧美日韩综合视频 | 日本一区二区精品视频 | 中文字幕久久精品 | 国产原创视频在线 | 午夜影院操 | 在线 丝袜 欧美 日韩 制服 |