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
22
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.
Why does the author mention an elderly mouse in paragraph 2?
选项
A、To describe the influence of old age on mice.
B、To illustrate the effect of a meager diet on mice.
C、To tell us how mice’s liver genes behave.
D、To inform us of the process of metabolizing drugs.
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/NUcO777K
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
Furnituremakersusegluetoholdjointstogetherandsometimestoreinforceit.
Doctoroften______uneasinessinthepeopletheydealwith.
IntheUnitedStatesandinmanyothercountriesaroundtheworld,therearefourmainwaysforpeopletobe【C1】______aboutdeve
Lifeinsurance,beforeavailableonlytoyoung,healthypersons,cannowbeobtainedforoldpeople,andevenforpets.
Lifeinsurance,beforeavailableonlytoyoung,healthypersons,cannowbeobtainedforoldpeopleandevenforpets.
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
主席先生,中国代表团很高兴与其它代表团相聚日内瓦,共同审议信息社会世界峰会的有关筹备事宜。首先,请允许我代表中国代表团衷心祝贺你当选峰会筹备委员会主席。//我希望,在你的领导下,峰会的筹备工作能在本次会议上有一个良好的开端和基础。中国代表团将与你
下面你将听到一段有关扩大开放与鼓励外商投资的讲话。
随机试题
王某大学毕业后到某通讯集团公司工作,双方订立劳动合同约定:公司对王某进行为期半年的通讯技术专业培训。王某在培训后3年之内不能离开公司,如违反则需支付公司违约金2万元。到公司报到后,公司对王某进行了培训,并因此支付了专项培训费用总计1万5千元。经培训,王某已
下列哪项不是“天癸”臻熟的条件
房地产会计主要是指房地产开发企业的一种专业会计,它是应用会计学的基本理论和基本方法,以货币为主要计量单位。()
关于施工成本管理组织机构设置的要求,正确的有()。
根据《证券经纪人管理暂行规定》规定,证券经纪人不得有下列()行为。Ⅰ.替客户办理账户开立、注销、转移Ⅱ.与客户约定分享投资收益Ⅲ.向客户传递由证券公司统一提供的证券类金融产品宣传推介材料及有关信息Ⅳ.为客户之间的融资提供中介、担
甲商场出售一批皮包,单价为3880元,商场在制作价格标签时,误将3880元写成了388元。唐某来逛商场觉得价格便宜,决定买一个。商场售货员孔某第一天上班,对商品不熟悉,就将该包以388元卖给了唐某。后商场发现了此事,要求唐某退货或补足价款。唐某拒绝,引起纠
一个好的估计量应具备的特点是()
(1)打开考生文件夹下的数据库文件“大学管理”,修改并执行程序four.prg。程序four.prg的功能是:①建立一个“工资表”(各字段的类型和宽度与“教师表”的对应字段相同),其中职工号为关键字。②插入一条“职工号”、“姓名”和“
在百花盛开,蜜源丰富的季节(1),我们姐妹们愉快地忙着采蜜。在花开得少,蜜源缺乏的季节,我们就(2)一些昆虫身上和一些叶子的蜜腺上吸取蜜汁,以(3)花蜜的不足。如果在我们采蜜回来的路上天气(4)变坏,我们就一边飞一边爬,坚持把蜜送回家中,我们才
Theterm"qualityoflife"isdifficulttodefine.It【C1】______averywidescopesuchaslivingenvironment,health,employment,
最新回复
(
0
)