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
Jonas Frisen had’ his eureka moment in 1997. Back then, scientists suspected that there was a special type of cell in the brain
admin
2011-02-11
4
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 human brain. And he’s now researching the mechanisms by which these cells 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 cells 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. He’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 15-year professorship at Karolinska, eovering his salary and the running costs of his 15-person lab. "Jonas Frisen stood out from all candidates by far," says Storch, whose 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 fight, which argues that scientists ought to concentrate solely on adult stem ceils. 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.
According to the’ passage, what does the author think of Frisen’s findings?
选项
A、They enable cells to make repairs.
B、They are elementary achievements.
C、They have a limited application prospect.
D、They imply and show great potential.
答案
D
解析
细节题。由题干中的findings定位至第二段。第二句指出:But the findings so far hint at extraordinary potential,此处没有引述Frisen本人或他人的观点,D符合文意,故为答案。这里提到Frisen的发现具有极大的潜力,C中的limited与extraordinary矛盾,排除。首句提到:Frisen is quick to emphasize that his research is basic,这是Frisen的观点,并非作者观点,排除B。A是针对首段倒数第三句中的as though they were busy making repairs设计的干扰项,这里是Frisen对其观察到的现象的描述,并非作者观点,排除A。
转载请注明原文地址:https://jikaoti.com/ti/ugpYFFFM
0
专业英语八级
相关试题推荐
CharacteristicsofaBureaucracyPeopleusuallyholdnegativeopiniontowardsbureaucracy,butaccordingtoMaxWeber,burea
Foryears,Europeanshavebeenusing"smartcards"topaytheirwaythroughtheday.Theyusetheminshopsandrestaurants,plu
Ihavenostatisticsonthis,butconversationwithfriendsanddozensofperson-on-the-streetinterviewsIsawandheardlastm
Why,youmaywonder,shouldspidersbeourfriends?Becausetheyprotectsomanyinsects,andinsectsinclude【M1】______someof
Ateamofinternationalresearchershasfoundnewevidencethatanendangeredsubspeciesofchimpanzeeisthesourceoftheviru
HumanitiesDisciplinesInmanypeople’seyes,thehumanitiesdisciplinesseemtobedyingout.However,actually,students
BythetimeIbeganteachingintheearly1970s,everyonealreadyseemedtobeinbusinessforhimself,lookingforthebestdea
Contrasttoresearchers’expectations,dysfunctionalfamilyrelationshipsandpoor
Priorto1905,spaceandtimewerecomfortableabsolutes.Over250yearsofpracticalexperienceandexperimentationhadfirmly
A、BecauseheescapedwithoutinjuryfromthesecondtoweroftheWorldTradeCenter.B、Becausehewasseriouslyinjuredduringt
随机试题
下列叙述错误的是
稳定蛋白质分子中仪一螺旋的化学键是
当坡度小于3%时,卷材的铺设方向宜()屋脊铺贴。
在下列( )情形下,人民法院应裁定终结执行。
占有、使用国有资产的单位( )应当进行产权界定。
天津市宁河县东棘坨镇史庄中心小学教师张熙玲,因拒绝拆迁被当地教育主管部门责令停课,甚至面临不同意拆迁,就调到偏远山区的威胁。试依据相关法律法规说明宁河县教育局侵犯了教师的哪项权利?
串是一种特殊的线性表,下列不能体现其特殊性的有()。
POP3邮件传递过程可以分为三个阶段,它们是()。
请在【答题】菜单下选择【进入考生文件夹】命令,并按照题目要求完成下面的操作。注意:以下的文件必须保存在考生文件夹下。文慧是新东方学校的人力资源培训讲师,负责对新入职的教师进行入职培训,其PowerPoint演示文稿的制作水平广受好评。最近,她应北京节水
DothefollowingstatementsagreewiththeinformationgiveninReadingPassage2?Inboxes19-23onyouranswersheet,writeTR
最新回复
(
0
)