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
考研
Athletes who cheat by injecting themselves with stored supplies of their own blood might soon be caught out. A revealing trail o
Athletes who cheat by injecting themselves with stored supplies of their own blood might soon be caught out. A revealing trail o
admin
2017-04-13
48
问题
Athletes who cheat by injecting themselves with stored supplies of their own blood might soon be caught out. A revealing trail of debris could give the game away.
Most "blood dopers" cheat by injecting themselves with the blood-boosting hormone erythropoietin(EPO), but there have been tests to detect EPO since 2000. Another way to dope blood is to periodically extract some of your own, store it and re-inject it before competitions. Some professional cyclists are alleged to have done this as part of a doping scandal that emerged in Spain in 2006, called Operacion Puerto. At least one cyclist is still fighting to clear his name.
Re-injecting stored blood boosts the oxygen supply to muscles. The practice has so far eluded detection but now there might be a way catch out the cheats.
During storage, red blood cells start to fall apart, generating debris such as the fragments of cell membranes(a cell membrane is the outside envelop of a living cell). Olaf Schumacher of the University of Freiburg in Germany and his colleagues have shown that when stored blood is re-injected, the recipient’s white blood cells prepare to get rid of this sudden tide of debris. They say that these changes on blood cell ’debris’ could betray sportsmen and make cheats detectable. "It’s like someone dumping rubbish in your blood," he says. "When all the rubbish comes at once, there’s lots of activity."
Schumacher’s team took blood from six non-athletes, stored it for 35 days then re-infused it, taking further blood samples three and four days afterwards. When they analyzed the white blood cells in these samples, genes needed for identifying and disposing of ailing and damaged cells were much more active than usual.
The gene changes led to the appearance of new proteins on the surface of the white blood cells which could potentially be picked up by antibodies, Schumacher says. He also suggests that antibodies could be created to detect the changes to the surface of red blood cells as well. Schumacher couldn’t say whether such tests would be ready in time for the 2012 Olympics in London. David Cowan, director of the UK Drug Control Centre at King’s College London, says: "The paper is promising, but more work is needed to establish a test that meets the rigorous standards required by sport so as not to falsely accuse an athlete." Schumacher says that one key goal is to make sure these changes only occur due to doping, rather than illness, for example.
According to Paragraph 4, which of the following is true about the debris?
选项
A、The white blood cells are ready to get rid of it all the time.
B、It is the product of red blood cells during blood storage.
C、It could help sports cheats avoid detection.
D、It is fragments of cell membranes.
答案
B
解析
判断推理题。第四段第一句提到,在血液储存的过程中,红血球细胞开始分裂,产生出诸如细胞膜碎片之类的残骸。B项符合原文。
转载请注明原文地址:https://kaotiyun.com/show/V1bZ777K
0
考研英语一
相关试题推荐
You’venowhearditsomanytimes,youcanprobablyrepeatitinyoursleep.PresidentObamawillnodoubtmakethepointpublic
You’venowhearditsomanytimes,youcanprobablyrepeatitinyoursleep.PresidentObamawillnodoubtmakethepointpublic
WildBillDonovanwouldhavelovedtheInternet.TheAmericanspymasterwhobuilttheOfficeofStrategicServicesinWorldWar
Oneofthereallystartlingthingsabouttoday’sdecisionontheAffordableCareActisthatthewholebroccoliissue.Onemight
Oneofthereallystartlingthingsabouttoday’sdecisionontheAffordableCareActisthatthewholebroccoliissue.Onemight
Youcannotplaceavalueoneducation.Knowledgeisthefoodofthesoul,Platosupposedlyremarked.Greatliterature"irrigates
Americanstodaydon’tplaceaveryhighvalueonintellect.Ourheroesareathletes,entertainers,andentrepreneurs,notschola
Someinternationalstudentsarecomingtoyouruniversity.WritethemanemailinthenameoftheStudents’Unionto1.exte
TherewasagreatdealtobetroubledbyinareportbytheInternationalCommitteeoftheRedCrossdocumentingthekindsofto
Severalweeksago.threeofthecountry’smostrespectedinstitutionsofhigherlearning,Harvard,Princeton,andtheUniversity
随机试题
(2011年4月)(2010年4月)中国共产党全国代表会议调整和增选中央委员及候补中央委员的数额,不得超过党的全国代表大会选出的中央委员及候补委员各自总数的__________。
肺热咳嗽,甚则气急欲喘,皮肤蒸热,日晡尤甚,舌红苔黄,脉细数者,治疗宜用()(2006年第55题)
患者女,53岁。耳道溢液伴耳痛1个月余。体检发现外耳道肉芽样新生物,质脆易出血,颈深上淋巴结肿大。CT提示外耳道骨质有破坏。患者所患疾病最有可能的是
与妊娠期龈炎的发生密切相关的是
根据《合同法》,下列关于格式条款合同的说法中,正确的是()。
远期外汇交易是在外汇买卖时,双方先签订合约,规定交易货币的种类、数额及适用的汇率和交割时问,并于将来约定的时间进行交割的外汇交易。它最常见的期限是()
阎某是某国有企业的厂长,张某是该厂某车间主任,在上任1年多的时间内阎某先后接受他人送来的贿赂10万多元,并在自己任职的企业内为他人提供包括安排工作在内的尽可能的便利。其中有5万多元是通过张某介绍来的人送的,阎某将其中2万元送给张某作酬劳费。张某后来赌钱欠别
PepysandhiswifeJanehadaskedsomefriendstodinneronSunday,September2nd,1666.TheywereupverylateontheSaturdaye
Bigcitestodayareconfrontedwithveryseriousproblems.Transportisa【C1】______difficulty:someplannersbelievein【C2】_____
Itisdifficulttoconceivehow,evenforthosepeoplewelldisposedtorulethemselves,theattempttoachievehappinessshould
最新回复
(
0
)