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
A meager diet may give you health and long life, but it’s not much fun—and it might not even be necessary. We may be able to han
A meager diet may give you health and long life, but it’s not much fun—and it might not even be necessary. We may be able to han
admin
2011-01-10
52
问题
A meager diet may give you health and long life, but it’s not much fun—and it might not even be necessary. We may be able to hang on to most of that youthful vigor even if we don’t start to diet until old age.
Stephen Spindler and his colleagues from the University of California at Riverside have found that some of an elderly mouse’s liver genes can be made to behave as they did when the mouse was young simply by limiting its food for four weeks. The genetic rejuvenation won’t reverse other damage caused by time for the mouse, but could help its liver metabolize drugs or get rid of toxins.
Spindler’s team fed three mice a normal diet for their whole lives, and fed another three on half-rations. Three more mice were switched from the normal diet to half-feed for a month when they were 34 months old—equivalent to about 70 human years.
The researchers checked the activity of 11,000 genes from the mouse livers, and found that 46 changed with age in the normally fed mice. The changes were associated with things like inflammation and free radical production—probably bad news for mouse health. In the mice that had dieted all their lives, 27 of those 46 genes continued to behave like young genes. But the most surprising finding was that the mice that only started dieting in old age also benefited from 70 percent of these gene changes.
"This is the first indication that these effects kick in pretty quickly," says Huber Warner from the National Institute on Aging near Washington, D.C..
No one yet knows if calorie restriction works in people as it does in mice, but Spindler is hopeful. "There’s attracting and tempting evidence out there that it will work," he says.
If it does work in people, there might be good reasons for rejuvenating the liver. As we get older, our bodies are less efficient at metabolizing drugs, for example. A brief period of time of dieting, says Spindler, could be enough to make sure a drug is effective.
But Spindler isn’t sure the trade-off is worth it. "The mice get less disease, they live longer, but they’re hungry," he says. "Even seeing what a diet does, it’s still hard to go to a restaurant and say: ’I can only eat half of that’."
Spindler hopes we soon won’t need to diet at all. His company, Life Span Genetics in California, is looking for drugs that have the effects of calorie restriction.
In the experiment, the most interesting finding that the researchers got is ______.
选项
A、that elderly mice can benefit much from dieting
B、that 27 of those 46 old genes of mice continued to behave like young genes
C、that calorie restriction plan also works in people
D、that dieting can make drug effective
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/jUcO777K
本试题收录于:
NAETI中级口译笔试题库外语翻译证书(NAETI)分类
0
NAETI中级口译笔试
外语翻译证书(NAETI)
相关试题推荐
Japanandthenewlyindustrializedcountriesarepassinglabor-intensivesectsasgarment-makingovertolessdevelopednations
TheprincipaldutyoftheUnitedNationsistosafeguardthepaceoftheworld.
IntheUnitedStatesandinmanyothercountriesaroundtheworld,therearefourmainwaysforpeopletobe【C1】______aboutdeve
IntheUnitedStatesandinmanyothercountriesaroundtheworld,therearefourmainwaysforpeopletobe【C1】______aboutdeve
Themayorclaimedthatheresignedbecauseofahealthcrisis,butsomebodylearnedthroughthegrapevinethathewasafraidof
尊敬的各位嘉宾,女士们,先生们,朋友们:我代表中国政府,对莅临会议的东盟国家领导人和各位嘉宾表示热烈的欢迎!中国与东盟各国政府高度重视发展友好关系和互利合作。自2004年首次举办中国—东盟博览会和商务与投资峰会以来,双方积极推进中国—东盟自由贸易
地球大气层正在转暖,这种迹象日趋明显,这向人们提出了一个重大问题,即地球变暖在多大程度上应归咎于人类活动,又在多大程度上是自然原因造成的?气候变化科学家们正在寻求答案。经过对全球气候变化的全方位定期科学评估,科学家们断定全球气候受到了“显而易见的人为影响”
随机试题
A.慢性肾功能不全B.肾前性急性肾功能不全C.痛风D.尿路感染E.急性肾小球肾炎(肾功能正常)
对角膜透明性起重要作用的因素有
手部创伤止血时止血带应缚于
患者,女,30岁。平索性情急躁,每因情绪激动诱发痫证发作.发则昏仆不省人事,伴有四肢抽动,口吐涎沫,口苦咽干,尿赤便干,舌红,苔黄腻,脉弦滑数。其辨证为
甲乙约定,甲以分期付款的方式购买乙的一处房产,乙的下列做法中错误的是:()。
某企业拟投资建设的新项目有关情况如下。项目计算期:建设期2年,生产期10年。投资估算和资金使用计划:工程费用(含建筑工程费、设备购置费及安装工程费)为10000万元,工程建设其他费用为1900万元,基本预备费费率为8%,建设期内年平均物价上
皮亚杰的研究表明,感知运动阶段的一个显著标志是儿童渐渐获得()。(2014.湖北)
当你熟悉塑料袋装东西的功能后,就不容易想到或发现它在紧急情况下可以当“小便袋”使用。这种心理现象叫做________。
中国共产党的根本宗旨和一切工作的根本出发点是()。
LookattheinformationonthefollowingpageabouttheuseofvehiclesintheUniversitygrounds.Inboxes1—5onyouranswer
最新回复
(
0
)