<tt id="6hsgl"><pre id="6hsgl"><pre id="6hsgl"></pre></pre></tt>
          <nav id="6hsgl"><th id="6hsgl"></th></nav>
          国产免费网站看v片元遮挡,一亚洲一区二区中文字幕,波多野结衣一区二区免费视频,天天色综网,久久综合给合久久狠狠狠,男人的天堂av一二三区,午夜福利看片在线观看,亚洲中文字幕在线无码一区二区
           
            | Home | News| Living in China| MMS | 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?特立獨行科學家遭質疑 (2002/12/02)

          Scientists Doubt Imminent Birth of Human Clone
          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)

          人類第一個克隆人會在2003年誕生嗎?意大利一位人類生育學專家日前宣布,他的一位實驗對象將于明年年初生下第一個克隆人。然而,許多科學家,甚至包括克隆羊"多莉"之父在內,都對此表示懷疑。

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

          十年前,這位特立獨行的科學家就已經名揚天下了,當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。但他拒絕為這次的克隆人項目透露更多的細節。只是說,這個克隆胚胎現在狀態很好,非常健康,目Scientists Doubt Imminent Birth of Human Clone前體重大約是6磅。

          對此,同在這一領域的其他專家紛紛表示懷疑。

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

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

          克隆羊"多莉"的問世是應用了一項稱為細胞核轉移的技術。就是將卵細胞的細胞核去除,然后用預備克隆的動物的細胞核取而代之。

          這是一種技術含量很高風險也極大的方法。能夠讓實驗對象懷孕的幾率非常小,而且懷孕后流產和畸形胎兒的幾率也相當高。

          即使看起來很健康的克隆生物也會攜帶畸形病變的基因,而且他們的壽命通常會比正常生物的要短,因為克隆過程中的細胞隨著年齡的增長,DNA會逐漸遭到破壞。

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

          (中國日報網站譯)

           
          Go to Other Sections
          Related Stories
          · Beer flows from house taps in Norway
          水龍頭里出啤酒 挪威婦女感覺"身在天堂"
          · Woman sells ad rights to pregnancy on eBay
          拿人體打廣告 孕婦肚子拍賣廣告權
          · Clocks in UK's armory against problem gambling
          英國放開賭博業 時鐘被"邀"防賭癮
          more
           
          Copyright by chinadaily.com.cn. All rights reserved

          版權聲明:未經中國日報網站許可,任何人不得復制本欄目內容。如需轉載請與本網站聯系。
          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: 别揉我奶头~嗯~啊~的视频 | 国产成人一区二区三区免费视频| 国产老熟女视频一区二区| 国产成人高清在线观看视频| 亚洲色欲色欲在线大片| 国精偷拍一区二区三区| 久久99国产视频| 亚洲一级特黄大片在线观看| 大地资源高清免费观看| 久久人体视频| 最新永久免费AV无码网站| 亚洲欧洲日产国码二区在线| 韩国无码AV片午夜福利| 免费人妻精品一区二| 四虎在线播放亚洲成人| 亚洲AV无码一区二区三区在线播放| 国产成人久久精品一区二区| 亚洲av无码专区在线亚| 亚洲综合色区另类av| 久久久亚洲欧洲日产国码aⅴ| 亚洲第一狼人天堂网伊人| jizzjizz欧美69巨大| 香蕉久久夜色精品国产成人| 亚洲香蕉av一区二区蜜桃| 四虎成人精品在永久免费| 欧美人与zoxxxx另类| 欧洲美熟女乱又伦免费视频| 美女视频黄频大全视频| 少妇自慰流白口浆21p| 亚洲 日韩 国产 制服 在线| 久久香蕉国产线看观看怡红院妓院| 国产旡码高清一区二区三区| 一级片麻豆| 图片区小说区av区| 亚洲色欲色欱WWW在线| 国产精品美女网站| 成人看片欧美一区二区| 夜夜添无码试看一区二区三区| 天天躁日日躁狠狠躁2018| 综合色久七七综合尤物| 久久久久久99精品热久久 |