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中文:高中生物教学论文:濒危动物复生有望 前不久,美国科学家利用克隆技术培育的濒临绝种动物诞生,可惜的是这只名叫“诺亚”的亚洲野牛宝宝,出生两天后便因感染痢疾而死亡。科学家估计,经过人类的猎杀及本身居住环境的恶化,全世界的亚洲野牛大约仅剩下3.6万头。虽然“诺亚”已经死亡,但研究人员声称,这是以克隆技术挽救濒临绝种动物的一次重大胜利。这项技术正为濒临绝种或绝种不久的野生动物开辟出重生复活之路。 “诺亚”是第一只借助其他物种的子宫来孕育,并顺利通过胚胎发育阶段而产下的动物。另外五只植入克隆亚洲野牛胚胎的母牛,都在植入后自动流产。试验表明,跨物种克隆是可行的。验尸结果发现,“诺亚”的死并非因为它是克隆牛或运用跨物种生育技术而导致的,因痢疾常见于农场动物身上,致死率可达百分之百。为了创造出“诺亚”,科学家从死亡野牛身上取得一枚细胞,植入母乳牛的卵细胞内,并移去卵细胞的DNA,以确保生下的小牛是纯亚洲野牛,而非野牛和乳牛的混种。 不过,也有部分科学家,对以克隆技术挽救濒绝动物的作法表示质疑。爱荷华大学生物伦理学项目负责人加里。康斯达克说,这些动物就是因为无法在目前的环境生存,才会濒临绝种,如果环境没改善,把它们克隆出来,只是要它们来这世间受苦。 2000年1月,母山羊“西莉亚”在西班牙北部崎岖的高原闲逛时,不幸被倒下的大树压死。“西莉亚”的死备受瞩目,因为它是世界上最后一只厚毛巨角布卡多山羊。西班牙政府曾大力保护布卡多山羊,但终究功败垂成,最后一只布卡多公羊在1991年死亡。西班牙和美国研究人员携手合作,打算利用“西莉亚”留下的细胞,克隆出布卡多山羊。若计划成功,则可成为细胞克隆绝种动物的范例。 但是,世界野生动物基金会的喀伦。巴拉可娜提出意见说,这项(西莉亚)计划根本是科学怪人在拼凑怪兽,我看不出它有任何价值。因为动物不会因数量减少而濒临绝种,症结在于栖息地消失或盗猎,除非人们重视这些原因,否则靠克隆不能解决问题。 在澳大利亚波诺隆公园野生动物中心的入口附近摆有1小张动物毛皮,旁边的说明显示这是袋狼的毛皮。但事实上澳大利亚早已看不到这种动物的踪迹了,袋狼由于人类滥杀而在70年前就绝迹了。澳大利亚的生物学家决定利用自标本取得的DNA样本,进行生物克隆计划。他们已经找到这种动物的细胞去氧核糖核酸(DNA),目前正进行生物克隆计划。这只6个月大的袋狼标本自1866年起就浸泡在酒精溶液中保存,科学家们已经完成从这标本中取得心脏、肝、肌肉和骨髓的取样,开始研究这种动物的基因密码。一旦研究人员还原受损的标本基因密码,就会将基因的蓝图植入袋狼的近亲袋獾或袋食蚁兽的卵子中进行培育。 虽然目前世界许多地方都有克隆绝种动物的计划,但澳大利亚的袋狼克隆计划是第一个能够取得良好品质DNA样本的研究计划。翻译:High school biology teaching paper: endangered animals rebirth is expected 从这开始是的: Recently, American scientists using cloning cultivation of endangered species born, it is a pity that only named "Noah" Asian buffalo baby, two days after birth and death e to infection dysentery and. Scientists estimate that, after hunting and itself living the deterioration of the environment, the world had only about the Asian bison 3.6 million. Although "Noah" had died, but the researchers claim that it is cloning technology save endangered species of a major victory. The technique is is endangered or extinct soon wildlife hewed rebirth of the resurrection road."Noah" is the first with other species to pregnant uterine and smoothly through the embryonic development stage and gave birth to the animals. Another five Asian buffalo embryo implanted cloning heifer, are implanted automatically after the abortion. Experiment shows that cross species cloning is feasible. Autopsy results found that "Noah" death is not because it is a cattle or use cross species reproctie technologies, from diarrhea caused by the common in farm animals and deadly rate can amount to 100 percent. In order to create "Noah," the scientists from death has a medal for buffalo body cells implanted inside the egg, milk cow and remove egg DNA to ensure that gave birth to the Dallas mavericks are pure Asian bison, rather than buffalo and mixture of cows.However, there are some scientists, to save the endangered animal cloning technology rejects the practice questioned. University of Iowa bioethics project principal Gary. KangSi wardak, said the animal is because you are not in the current environment survive, will become extinct, if environment don't improve, they cloned, just want to them to this world suffering.In January, 2000, female goat "Celia" in northern Spain rugged plateau netherwhelp, unfortunately was crushed under the fallen trees. "Celia" death high-profile, because it is the world's last a thick MaoJu Angle cloth card more goats. The Spanish government was a strong protection cloth card many goats, but ultimately choke, and finally a cloth card more ram in 1991 death. Spain and U.S. researchers cooperate, going to use "Celia" cells left behind, cloned cloth card more goats. If the plan is successful, then can become cells cloned animal now extinct paradigm.However, the world wildlife fund in Khartoum Aaron. Barak can na comments, said the (Celia) program is fundamentally science freak frankenstein monsters in together, I don't see it any value. Because the animal won't because the decrease in the number and endangered habitats disappear or, lies in the poaching, unless people to pay attention to these reasons, or by cloning does not solve the problem.In Australia bono lung park wildlife center entrance near place one zhang animal skins, the instructions next to the show is this bag Wolf fur. But in fact Australia already see the animal's trail, bag Wolf because human killing and in 70 years ago was extinct. Australia's biologist decided to use DNA samples obtained from the specimen, biological cloning plan. They have found that animal cells to oxygen ribonucleic acid (DNA), were now being biological cloning plan. This only 6 months since 1866 bag Wolf specimen has soaked in alcohol solution preservation, scientists have completed from this specimen obtained in the heart, liver, muscle and bone marrow sampling began studying this animal genes password. When researchers rective damaged specimens of genetic code, will the blueprint of gene implanted bag Wolf Cousins of the devils or bag anteater eggs breeding.Although at present many parts of the world have cloned animal now extinct plans, but Australia's bag Wolf cloning plan is the first one can get good quality of DNA samples from research plan.Im sorry... I can't make it... sorry~~~