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
2015-06-24
64
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 todetect EPOsince 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.
Which kind of "blood dopers" is least likely to be detected in the past?
选项
A、People who inject themselves with EPO.
B、People who extract and re-inject some of their own blood.
C、People who took part in cycling competition in Spain in 2006.
D、People who are careful enough to avoid detection.
答案
B
解析
事实细节题,考查是非细节。第三段第二句讲到,长久以来,这种做法(re-injecting stored blood)一直无法被检查出来,B项符合文意。A项为两种作假方法中容易被检测出的一种;C、D两项在文中并未提及。
转载请注明原文地址:https://kaotiyun.com/show/Q574777K
0
考研英语一
相关试题推荐
AmericanScientistsTrytoDevelopArtificialBloodVesselwiththeSkinCellScientistshavegrownbloodvesselsforkidney
NetworkSafetyAHousecommitteeisreopeningitsinvestigationofInternetservicesthatletcomputerusersdistributemusi
Despitetheeverydayuseofelectricalappliancesandtechnicaldevices,onlyaminorityofpeoplelivingtodayhasdeeperinsig
Despitetheeverydayuseofelectricalappliancesandtechnicaldevices,onlyaminorityofpeoplelivingtodayhasdeeperinsig
Somegreatmeninsistthateducationshouldheconfinedtosomeparticularandnarrowend,andshouldissueinsomedefinitewor
Thedebateabouthowideas,opinions,andbehaviorsradiatewithingroupsofpeoplegoesbackdecades.Accordingtotheso-calle
Comparedwithothermodesoftransport,traintechnologymightseemtobeprogressingasslowlyasasuburbancommuterservicer
Forallhisvauntedtalents,FederalReserveChairmanAlanGreenspanhasneverhadmuchofareputationasaneconomicforecaste
Oneofthemosteminentofpsychologists,ClarkHull,claimedthattheessenceofreasoningliesintheputtingtogetheroftwo
Doanimalshaverights?Thisishowthequestionisusuallyput.Itsoundslikeauseful,groundclearingwaytostart.(46)Actu
随机试题
下列哪一项符合药物信息服务的质量要求()
男,72岁。下肢瘫痪,近期发现其骶尾部呈紫红色,皮下有硬结和水疱,该临床表现是褥疮的
患者男性,因高血压,在路上行走突然晕倒,经CT检查发现为高血压脑出血,急诊行开颅手术,术后送人神经外科病房,神志不清,脏器功能紊乱,给予监护。这样的患者采取的最佳护理方式是
下列施工质量控制点中,从关键操作与施工方法的角度进行重点控制的是()。
2015年1月,甲煤矿公司开采原煤100万吨,将其中50万吨移送加工生产选煤,销售洗煤30万吨,不含税销售收入1200万元,洗煤折算率为75%。销售原煤40万吨,不含税销售收入1000万元,原煤资源税税率6%。2015年1月甲煤炭公司应纳资源税为(
导游人员最为重要的心理品质是()。
医院某护士,对3床的农民称呼为“3号,……”,而对于高干病房的患者,称呼为“爷爷,……”,这个护士违反的原则是()。
我国第一部志人小说是()。
软件生命周期是指()。
To:ChristopherReedFrom:LaurenButlerRe:PrinterDearMr.Reed,Iamreturningmyprintertoyourcompany’scustomerservi
最新回复
(
0
)