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
72
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.
On which of the following aspects does Frisen disagree with some radicals?
选项
A、Whether research should be done on embryonic stem cells.
B、Whether research should be done on adult stem cells.
C、When should people expect a drug for Parkinson’s.
D、When should clinical trials of stem-cells research begin.
答案
A
解析
细节题。根据题干中的radical及题目顺序定位至末段。首句指出一些右翼激进分子的观点:scientists ought to concentrate solely on adult stem cells。在第二句提到“He happens to disagree”之后,指出Frisen的观点:To really understand adult cells,we need to master how embryonic stem cells work.可见Frisen认为两种细胞的研究都重要,即他们的分歧在embryonic stem cells,故[A]为答案。
转载请注明原文地址:https://kaotiyun.com/show/WrlO777K
0
专业英语八级
相关试题推荐
Alotofpeoplebelievethattelevisionhasaharmfuleffectonchildren.Afewyearsago,thesamecriticismsweremadeofthe
Shebrokeoffwithalittleshudder.ItwasarelieftoFramtonNuttelwhentheauntbustledintotheroomwithawhirlofapolo
The3rdgenerationofprogramminglanguagesharesallthefollowingcharacteristicsEXCETPWhichprogramminglanguageisdesign
FromthepassageweknowthatNegroes______.Accordingtothepassagewhatisunknowntomanypeopleisthat
Themeaningofwordsmaychangewithtime,"deer"isaexampleof______.
Cultureshockisapainfulexperiencewegothroughwhenweencountermanynewthingsinanothercountryandwe【1】______insom
A、AgreaterpartofBurma.B、Xiannin,BeijingandShanghai.C、SouthKoreaandmanyothercountriesofEurope.D、MiddleEastand
1 Whilethemissionofpublicschoolshasexpandedbeyondeducationtoincludesocialsupportandextra-curricularactivities,
Ofalltheareasoflearningthemostimportantisthedevelopmentofattitudes.Emotionalreactionsaswellaslogicalthought
WhenIwasabout11,Iinheritedmyolderbrother’spaperroute.Itwasagoodjob,thoughitmeanswakingupatthecrackofd
随机试题
女性,30岁,患风心病二尖瓣狭窄合并关闭不全,心悸、气短、下肢浮肿,每日口服地高辛0.25mg、双氢克尿噻25mg,1个月后感恶心、呕吐,心电图示:窦性心律,心率68次/分,室性期前收缩二联律,治疗应
德沃金理论的中心是批判
患者,男,62岁。因患糖尿病9年而长期接受胰岛素治疗,尿糖基本控制在(+~++)。昨晚因多食后,今上午尿糖定性试验为(+++),自行增加了胰岛素计量,1小时后突然感到心悸、饥饿、出冷汗,随即昏迷。患者送来医院后,为明确诊断,你认为应立即进行的检查是
饮水消毒的主要目的是( )
生态影响型项目工程分析的基本内容包括()。
票据贴现属于银行的()业务。
(2009年考试真题)根据我国证券交易所的相关规定,买卖、申购、赎回ETF的基金份额时应遵守()。
下列各项中,不能作为登记银行存款日记账凭证的是()。
学习程度需达到(),学习效果才最佳。
Iwouldgreatly______yourkindnessifyoucoulddomethatfavor.
最新回复
(
0
)