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
33
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.
What would be the best title for the text?
选项
A、Blood Cell "Debris" could Snare Sports Cheats
B、A New Type of Blood Doping
C、Several Measures Taken to Detect Blood Dopers
D、Antibodies are Created to Detect Blood Dopers
答案
A
解析
主旨大意题。全文主要讲的是利用血液“残骸”检测运动员的作弊行为。A项点明了主题,包含了关键词。B项“新型血液注射方式”不符合文章主题;C项中的several measures过于宽泛;D项中将antibodies与debris混为一谈。
转载请注明原文地址:https://jikaoti.com/ti/qcFRFFFM
0
考研英语一
相关试题推荐
TheRapidDevelopmentofAdvancedPlacementCourseintheAmericanUniversityisVeryWorryingAsurveyof
GreenPaperEveninthiselectronicera,papercontinuestoplayacompleteroleinourdailylives.Americansdependonabo
Scientistsaresupposedtochangetheirminds.【F1】Havingadoptedtheirviewsonscientificquestionsbasedonanobjectiveevalu
Intalksaboutreducingthenation’sexplodinghealthcarecosts,theword"rationing"strikesfearintotheheartsofbothpati
Intalksaboutreducingthenation’sexplodinghealthcarecosts,theword"rationing"strikesfearintotheheartsofbothpati
Comparedwithothermodesoftransport,traintechnologymightseemtobeprogressingasslowlyasasuburbancommuterservicer
Theworldisundergoingtremendouschanges.Theriseofglobalization,bothaneconomicandculturaltrendthathassweptthroug
Oneofthemosteminentofpsychologists,ClarkHull,claimedthattheessenceofreasoningliesintheputtingtogetheroftwo
WecanlearnfromthefirstparagraphthatINS______.Besidesdealingwithbordersecurity,INSalso______.
Conventionaldisplayadsaresimplywasteful,saysJakobNielsenofGroupM,alargemediabuyer.Sayacompanywantstoreachyo
随机试题
急性龈乳头炎的病因不包括
A.TCRB.BCRC.FCRD.C3bRE.C4bRT淋巴细胞抗原识别受体
甲运输公司与乙客户签订运输合同时提供了一份格式合同,该格式合同规定运输费用为每车150元,对方按照此格式合同订约后,在履行中发生争议,甲认为运费是按车次计算,不是按车的载重计算,每车运费150元是不论车的大小的,只要是甲提供的运输车辆就行。乙则认为运输费用
下列工程项目管理组织机构中,结构简单、隶属关系明确,便于统一指挥,决策迅速的是()。
施工放样的原则是()。
下列有关风险回避的说法中,正确的有()。
1992年,一些海外旅游者来我国参加三项专线旅游,内容分别是“古典园林之旅”、“民族风情之旅”和“品尝名酒之旅”。请在下列地点中为每条专线选出四个相关的地点,每个地点中写出一个与专线内容相关的著名游览景点或少数民族名称或一种名酒的产地和酒名。地点:北京、苏
在关系S(S#,SN,D#)和D(D#,CN,NM)中,S的主键是S#,D的主键是D#,则D#在S中称为【】。
SQL通常不提供下列哪一种操作?
下列关于时钟的叙述中,哪一条是不正确的?()A)时钟中断可以屏蔽B)时钟是操作系统运行的必要机制C)时钟可以分成硬件时钟和软件时钟D)利用时钟中断可以实现进程的轮转运行
最新回复
(
0
)