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

 
  | Home | News| Living in China| SMS | About us | Contact us|
   
 Language Tips > 2002
Updated: 2002-12-02 01:00

Scientists Doubt Imminent Birth of Human Clone (2002/12/02)
克隆人明年一月問世?特立獨(dú)行科學(xué)家遭質(zhì)疑 (2002/12/02)
Dr. Severino Antinori

Will 2003 be the year of the first human clone? An Italian fertility expert says a patient will give birth to a cloned baby early next year but experts, including one who helped create Dolly the sheep, are skeptical.

Dr. Severino Antinori told a news conference in Rome on Tuesday that the cloned baby is due in January.

The maverick doctor gained fame nearly a decade ago when he helped a 62-year-old women give birth following fertility treatment with a donated egg, but he has revealed few details about his latest project. All he would say was that the cloned fetus was healthy and weighed roughly 6 pounds.

Other experts in the field have grave doubts.

Cloning experts doubt Antinori or his unknown colleagues have the expertise to clone a human. Although sheep, mice and pigs have been cloned, scientists have not yet produced a carbon copy of any primate.

Antinori did not produce any evidence so scientists do not know if he has achieved anything or if he is just seeking publicity.

Dolly the sheep was cloned using a technique called nuclear transfer. The nucleus of an egg cell was removed and replaced with the nucleus from a cell of the animal to be cloned.

It is a skilled and risky technique. Only a small percentage of clones result in pregnancies and there is a high percentage of miscarriages and deformities.

Even animal clones that look healthy may have genetic abnormalities or be predisposed to a decreased life span because the cells used in the cloning process acquire DNA damage as they age.

Antinori has not given any clues about how the human embryo was cloned nor who the progenitor, the person who has been cloned, is. "We will wait and we will see what the DNA studies show if a baby is born," one of the experts said. "I just hope it will not have abnormalities."

(Agencies)

人類第一個(gè)克隆人會(huì)在2003年誕生嗎?意大利一位人類生育學(xué)專家日前宣布,他的一位實(shí)驗(yàn)對(duì)象將于明年年初生下第一個(gè)克隆人。然而,許多科學(xué)家,甚至包括克隆羊"多莉"之父在內(nèi),都對(duì)此表示懷疑。

11月26日,塞韋里諾·安蒂諾里在羅馬召開新聞發(fā)布會(huì),宣布第一個(gè)克隆人將于明年1月份誕生。

十年前,這位特立獨(dú)行的科學(xué)家就已經(jīng)名揚(yáng)天下了,當(dāng)年他用一枚別人捐助的卵子使一位62歲的婦女受孕并順利生產(chǎn)。但他拒絕為這次的克隆人項(xiàng)目透露更多的細(xì)節(jié)。只是說,這個(gè)克隆胚胎現(xiàn)在狀態(tài)很好,非常健康,目前體重大約是6磅。

對(duì)此,同在這一領(lǐng)域的其他專家紛紛表示懷疑。

克隆專家們對(duì)安蒂諾里及他那些不知名助手們在克隆人類方面的專業(yè)知識(shí)深表懷疑。盡管人們已經(jīng)成功地克隆出了綿羊、老鼠和豬,但科學(xué)家們至今還沒有成功地對(duì)靈長類生物進(jìn)行過克隆。

安蒂諾里沒有透露任何證據(jù)支持自己的言論,因此其他科學(xué)家們不知道他是真的在克隆技術(shù)上有所突破還是僅僅在嘩眾取寵而已。

克隆羊"多莉"的問世是應(yīng)用了一項(xiàng)稱為細(xì)胞核轉(zhuǎn)移的技術(shù)。就是將卵細(xì)胞的細(xì)胞核去除,然后用預(yù)備克隆的動(dòng)物的細(xì)胞核取而代之。

這是一種技術(shù)含量很高風(fēng)險(xiǎn)也極大的方法。能夠讓實(shí)驗(yàn)對(duì)象懷孕的幾率非常小,而且懷孕后流產(chǎn)和畸形胎兒的幾率也相當(dāng)高。

即使看起來很健康的克隆生物也會(huì)攜帶畸形病變的基因,而且他們的壽命通常會(huì)比正常生物的要短,因?yàn)榭寺∵^程中的細(xì)胞隨著年齡的增長,DNA會(huì)逐漸遭到破壞。

安蒂諾里并沒有描述他在克隆人過程中的胚胎轉(zhuǎn)移技術(shù),也沒有提及被克隆者的身份。一位同一領(lǐng)域的專家說:"如果孩子真的生下來,究竟DNA會(huì)呈什么狀態(tài),我們將拭目以待。只希望不會(huì)出現(xiàn)畸形或變異。"

(中國日報(bào)網(wǎng)站譯)

 
Go to Other Sections
Story Tools
Font Large Small
E-mail This story
Print Friendly Format
Comment On This Story
Save This Story
 
Latest Stories
· The hidden pleasures of Athens
雅典——一座隱藏著快樂的城市
· Romania primps up faraway churches to lure tourists
羅馬尼亞老教堂沉睡百年 旅游資源急待開發(fā)
more
 
Copyright by chinadaily.com.cn. All rights reserved

版權(quán)聲明:未經(jīng)中國日報(bào)網(wǎng)站許可,任何人不得復(fù)制本欄目內(nèi)容。轉(zhuǎn)載請注明出處。
None of this material may be used for any commercial or public use. Reproduction in whole or in part without permission is prohibited.
 

 

主站蜘蛛池模板: 婷婷六月天激情 | 成人精品视频一区二区三区尤物 | 康熙大帝1994蔺达诺版 | 亚洲成a人在线观看 | 一区二区三区日韩在线观看 | 国产黄色三级 | 欧美大香线蕉线伊人久久 | 日本韩国一区二区三区 | 91精品久久久久久久久久 | 精品视频在线免费观看 | 亚洲精品婷婷无码成人A片在线 | 日本草草影院 | 精品国产视频 | 午夜精品视频在线观看 | 国产区在线观看 | av永久免费 | 国产成人在线一区二区 | 91看片在线看片 | 精品欧美乱码久久久久久 | 午夜免费电影网 | 美女被网站大全在线视频 | 欧美成人久久一级c片免费 91在线免费视频 | 亚洲国产精品网站 | 日本一区二区在线视频 | 男女真实有遮挡xx00动态图 | 99精品视频在线在线视频观看 | 2015小明看日韩成人免费视频 | 九九综合 | 亚洲天堂影院 | 国产精品小黄鸭一区二区三区 | 一级毛片男女做受 | 国产亚洲精品久久久久久久网站 | 欧美一区二区三区播放 | 桃花综合 | 亚洲图片欧洲电影 | 奇米影音四色 | 日韩在线欧美 | 91精品久久久久久综合五月天 | 2019天天干天天操 | 欧美成人26uuu欧美毛片 | 国产福利在线观看永久免费 |