久久亚洲国产成人影院-久久亚洲国产的中文-久久亚洲国产高清-久久亚洲国产精品-亚洲图片偷拍自拍-亚洲图色视频

您現在的位置: > Language Tips > Audio & Video > Special Speed News  
 





 
Genetic map points way to an improved honey bee
[ 2006-11-30 09:20 ]

This is the VOA Special English Agriculture Report.

Scientists now have a genetic map of the world's most important insect -- important to the food supply. The results showing the order, or sequence, of 98 percent of the honey bee genome created a buzz of excitement. Understanding how a honey bee is designed should help scientists produce stronger bees.

Honey bees are the world's major source of pollination for food, fiber and oilseed crops. Bees gather nectar from flowers; the liquid gives them food and material to make honey. As they land, their bodies pick up and drop off fine particles of pollen. Most flowering plants need pollination to reproduce.

But Kevin Hackett, an official at the United States Department of Agriculture, noted that the world's honey bee population is decreasing. He called the sequencing of its genome a powerful tool for fighting back against the causes.

One cause is the varroa mite which can kill young bees even before they leave their eggs. Another is the tracheal mite which nests in the breathing tube of adult bees.

Some people think that insect poisons have also played a part in reducing bee populations.

Experts say honey bees are responsible for as much as 20,000 million dollars worth of food production in the United States alone. But scientists have estimated that the bee population in the United States fell by 50 percent over the past half-century.

The main results of the Honey Bee Genome Sequencing Project Consortium appeared in the journal Nature. This international team is led by human-genome researchers at Baylor College of Medicine in Houston, Texas. Related reports appeared in other publications.

Like humans, bees have genes that give them a sense of day and night. Scientists believe this helps honey bees gather food.

Bees find flowers by smell. Bees have more genes for a sense of smell than other insects whose genes have been mapped. But one of the project scientists noted they have fewer genes for taste. He thinks this might help them avoid pesticides and plant diseases to find food.

The genetic research suggests that honey bees came from Africa. Their brains have similar genetic parts as the fruit fly. But fruit flies like to be alone. Scientists are interested in how, over millions of years, honey bees developed the complex social order in which they live.

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


pollination : 授粉

nectar : 花蜜


點擊進入更多VOA慢速


(來源:VOA  英語點津姍姍編輯)

 
 
相關文章 Related Stories
 
Cheese culture grows in Vermont Saving historic barns
         
 
 
 
 
 
         

 

 

 
 

48小時內最熱門

     

本頻道最新推薦

     
  Genetic map points way to an improved honey bee
  Laughter linked to health, happiness
  很“爵士”:至高無上的愛
  《絕望主婦》1(精講之二)
  NATO prepares for 2008 expansion

論壇熱貼

     
  福娃英文名更改,為何事先不考慮好?
  男扮女裝,女扮男裝?
  請教高人:關于社保方面的詞匯
  評頭論足之妙語連篇
  常用英語口語1000句
  翻譯:老鄉見老鄉,兩眼淚汪汪




主站蜘蛛池模板: 欧美人成人亚洲专区中文字幕 | 亚洲国产成人精品一区91 | 成年人在线视频免费观看 | 欧美巨大video粗暴 | 欧美亚洲在线 | 最新欧美精品一区二区三区不卡 | 在线视频观看国产 | 日韩免费a级在线观看 | 国产成人在线网址 | 免费国产成人高清无线看软件 | 成人欧美一区二区三区在线观看 | 99久久99久久久99精品齐 | 久久久久88色偷偷免费 | 国产欧美一区二区三区沐欲 | 97在线视频免费播放 | 精品国产成a人在线观看 | 99久久精品国产一区二区三区 | 99久久免费国产香蕉麻豆 | 女子张开腿让男人桶视频 | 免费国产不卡午夜福在线观看 | 国产高清美女一级a毛片久久 | 久久久这里只有精品加勒比 | 男人天堂视频在线观看 | 色综久久 | 99久在线精品99re6视频 | 俄罗斯黄色一级片 | 亚洲国产激情在线一区 | 免费国产黄网站在线观看视频 | 日韩一级片免费在线观看 | 欧美中文一区 | 日本国产一区二区三区 | 在线a人片免费观看国产 | 202z欧美成人 | 一级片中文字幕 | 和老外3p爽粗大免费视频 | 99精品国产在热久久 | 久久九九视频 | 一级毛片aaaaaa视频免费看 | 性欧美videos俄罗斯 | 日本亚洲免费 | 在线视频一二三区 |