首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Jonas Frisen had his eureka moment in 1997. Back then, scientists suspected that there was a special type of cell in the brain t
Jonas Frisen had his eureka moment in 1997. Back then, scientists suspected that there was a special type of cell in the brain t
admin
2010-07-19
88
问题
Jonas Frisen had his eureka moment in 1997. Back then, scientists suspected that there was a special type of cell in the brain that had the power to give rise to new brain cells. If they could harness these so-called neural stem cells to regenerate damaged brain tissue, they might someday find a cure for such brain diseases as Alzheimer’s and Parkinson’s. But first they had to figure out where neural stem cells were and what they looked like. Frisen, then a freshly minted Ph. D. at the Karolinska Institute in Stockholm, was peering through his microscope at some tissue taken from a rat’s injured spinal cord when he saw cells that appeared to have been enervated by the injury, as though they were busy making repairs. Frisen thought these might be the neural stem cells scientists had been looking for. It took him six years of painstaking research to make sure.
Frisen is quick to emphasize that his research is basic and that treatments are years off. But the findings so far hint at extraordinary potential. Two years ago he identified neural stem cells in the adult humanbrain. And he’s now researching the mechanisms by which these ceils grow into different types of brain cells. Rather than growing brain tissue in a petri dish and implanting it in, say, the forebrain of a Parkinson’s patient, doctors might someday stimulate the spontaneous growth of new neural ceils merely by administering a drug. "It sounds like science fiction," Frisen says, "but we can already do it in mice." In 2007 he will publish the results of his recent experiments, lie’s isolated a protein in the mouse brain that inhibits the generation of nerve cells. Using other chemicals, he’s been able to block the action of this inhibitor, which in turn leads to the production of new brain cells.
Frisen honed his analytical mind at the dinner table in Goteborg, in southwest Sweden. His mother was a mathematics professor and his father was an ophthalmologist. Frisen went to medical school intending to be a brain surgeon or perhaps a psychiatrist, but ended up spending all his free time in the lab. In 1998 he got seed money from a Swedish venture capitalist to set up his own company, NeuroNova, to commercialize his work. A private foundation tried to lure him to Texas, but Swedish businessman Marcus Storch persuaded him to stay by funding a IS-year professorship at Karolinska, covering his salary and the running costs of his 15-person lab. "Jonas Frisen stood out from all candidates by far," says Storch, who*Ic Tobias Foundation sponsors stem-cell research. "He is something of a king in Sweden." Two years ago two more venture capitalists helped the company expand by hiring a CEO and setting up a separate lab.
Since most researchers are interested in stem cells taken from embryos, the practice has attracted considerable controversy in the past few years. Frisen has benefited indirectly from research restrictions in the United States, which have driven funds and brain-power to Singapore, the United Kingdom and Sweden. The Bush Administration currently forbids U. S. -funded work on all but 78 approved stem-cell cultures, many of which are located outside the country. In just one sign of the times, the U. S. -based Juvenile Diabetes Research Foundation recently announced grants totaling $ 20 million for stem cell research--the largest award yet given to the field by a medical charity--to research institutes in Sweden and elsewhere, but not in the United States.
Since Frisen doesn’t work with embryonic stem cells, he’s unwittingly become a champion of the radical right, which argues that scientists ought to concentrate solely on adult stem cells. He happens to disagree. "It would be overoptimistic or outright stupid." he says. "To really understand adult cells, we need to master how embryonic stem cells work." But what really gets Frisen going is when people ask him when they can expect a drug for Parkinson’s and other diseases. "I say, five decades, just to get the number thing out of the way," he quips. "I’m not going to oversell this." When pressed, he admits that clinical trials might begin in five years. That would be a eureka moment worth waiting for.
As to the stem-cell research, the Bush Administration’s attitude is one of ______.
选项
A、skepticism.
B、disapproval.
C、ambivalence.
D、prudence.
答案
B
解析
态度题。由题干中的the Bush Administration定位至第四段。第三句指出布什政府现在禁止干细胞培养项目,即使同意的一些项目也是在国外进行的。可见,布什政府对体细胞研究持否定态度,故[B]为答案。[C]意为“举棋不定”,与文意不符,排除。[D]意为“审慎的”,程度不够,排除。
转载请注明原文地址:https://kaotiyun.com/show/PrlO777K
0
专业英语八级
相关试题推荐
Shebrokeoffwithalittleshudder.ItwasarelieftoFramtonNuttelwhentheauntbustledintotheroomwithawhirlofapolo
InBritain,popularnewspapersarealsocalled______.
Specialwordsusedintechnicaldiscussion______.Inrecentyears,therehasbeenamarkedincreaseinthenumberoftechnical
Ifyouhaveeverdreamedofslippingintothecomfortingsoftnessofacashmeresweateryoushouldfollowtheexampleofthehab
TheGreatWallofChinaWallsandwallbuildinghaveplayedaveryimportantroleinChineseculture.Thesepeople,fromthe
Thewritersuggeststhatthereisnosenseinbuyingthelatestvolume______.Throughoutthepassage,thewriter’stonetoward
TheUnitedStateshasamajorracialproblemonitshands.True,Britainisfacingasimilarproblem,butforthetimebeingit
1 Itakeitthatthepurposeofanylanguagecourseistodevelopinlearnerstheabilitytoengageincommunicativebehaviour
Howiscommunicationactuallyachieved.’?Itdepends,ofcourse,eitheronacommonlanguageoronknownconventions,oratleas
科学就是探求真理。在探求真理的过程中,人们对客观规律的认识要经过艰苦曲折的过程。常常有这样的情形:由于研究的角度不同,掌握资料的差异,认识方法的不同,廉洁会出现“横看成岭侧成峰,远近高低各不同”的情况以至引起学术上的争论。因此,有作为的科学工作者都把反对的
随机试题
张某从邻居男孩伟伟手中骗得房门钥匙一把,即作了模压并仿制后还了钥匙。一日张某拿着仿制的钥匙去伟伟家企图开门行窃,因钥匙仿制不准,未能成功,准备回家加工后继续作案,此时被人抓获。张某的行为属于()
通常情况下,高速缓存(Cache)容量越大、级数越多,CPU的执行效率越高。()
下列各项中,不属于蒙特卡洛模拟法步骤的是()。
为了测定某一光栅的光栅常数,用波长λ=632.8nm的单色平行光垂直照射光栅,已知第一级明条纹出现在30。的方向上,则此光栅的光栅常数为()。
计量器具经检定机构鉴定后,计量器具已经过检定,计量检定机构出具()。
F列各项中,应采坩红字更正法更正的有()。
按照《企业会计准则一建造合同》的规定,下列说法中正确的有()。
撰写教育研究成果,要注重观点和材料的一致性,主要问题在于()。
涂尔干主张教育要为国家培养合格的公民,这是典型的()的教育目的观。
Wemaylookattheworldaroundus,butsomehowwemanagenottoseeituntilwhateverwe’vebecomeusedtosuddenlydisappears.
最新回复
(
0
)