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
医学
Scientists have developed a slimming drug that successfully suppresses appetite and results in a dramatic loss of weight without
Scientists have developed a slimming drug that successfully suppresses appetite and results in a dramatic loss of weight without
admin
2013-11-30
44
问题
Scientists have developed a slimming drug that successfully suppresses appetite and results in a dramatic loss of weight without any apparent ill effects. The drug interferes with appetite control and prevents the build-up of fatty tissue. More importantly, the drug appears to prevent a serious decline in metabolic rate-causing tiredness and lethargy—which is typically associated with living on a starvation diet. As a result, mice taking the drug lost 45 percent more weight than mice fed the same amount of food, which compensate for the lack of food by becoming more sluggish.
The scientists, from the Johns Hopkins University in Baltimore, said that C 75 is likely to produce a similar effect on humans because appetite control in the brain is thought to be based largely on the same chemical pathways as those in mice. " We are not claiming to have found the fabled weight-loss drug. What we have found, using C 75, is a major path way in the brain that the body uses naturally in regulating appetite at least in mice," said Francis Kuhajda, a pathologist and senior team member. "We badly need effective drugs for weight loss. Obesity is a huge problem. We’re hoping to explore the possibilities of this new pathway," he said.
Discovering a biochemical pathway in the brain that controls appetite raises new prospects for developing slimming aids. Research on leptin, a hormone produced in fatty tissue for controlling fat deposits, has so far failed to produce the expected slimming drug break-through. The latest study, published in the journal Science, showed that even moderate doses of C 75 produced a significant loss of appetite, which returned to normal after a few months.
The scientists believe that C 75, which they produced synthetically in the laboratory, binds to an enzyme called fatty acid sythase, which is involved in storing excess food intake as fat. Inhibiting the enzyme causes a build-up of a chemical in the liver which acts as a precursor to fat deposition. This precursor is thought to have an indirect effect on the brain, causing appetite suppression.
Normally, when animals fast, a hormone called neuropeptide Y increases sharply in the appetite control centers of the brain, stimulating the desire for food. However, when animals are given C 75, levels of this hormone fall, leading to a loss of interest in food. Dr Kuhajda said discovering that C 75 has no effect on metabolic rate is one of the most significant findings of the study. "If you try to lose weight by starving, your metabolism slows down after a few days," he said. " It’ s a survival mechanism that sabotages many diets. We see this in fasting mice. Yet metabolic rate in the C 75-treated mice doesn’t slow at all. " Further animals studies will be needed before C 75 could be tested on humans.
The scientists from the Johns Hopkins University said that C 75, the slimming drug proved effective in mice, is likely to work on humans because______.
选项
A、the chemical pathway responsible for appetite control in human is believed to be the same as that in mice
B、it is a major pathway in the brain which is activated to regulate appetite
C、it is especially effective in the battle against obesity
D、its effect has also been proved by human studies
答案
A
解析
文章第二段开头便表明了人们可使用C 75来减肥的原因,即“because appetite controlin the brain…as those in mice”,这正是选项A所表达的意思。
转载请注明原文地址:https://jikaoti.com/ti/oDNDFFFM
本试题收录于:
医学博士外语题库考研分类
0
医学博士外语
考研
相关试题推荐
对早期食管癌,简单易行的确诊方法是
Shewasoftenobliviousofthepotentialconsequencesofheraction.
Englishspeakerspickuppitchintherighthemispheresoftheirbrains,butspeakersofcertainotherlanguagesperceiveiton
A、Shedoesn’tknowMarywell.B、Nancyisthebestnurse.C、LindaknowsMary.D、NancyisnotasgoodasLinda.D女士同意Linda是最好的护士之
A、Tomakeacalltothehospital.B、Togototheman’shouseimmediately.C、Toexpectthedoctor’scall.D、Totakeamessage.
A、Heisofferingapieceofadvice.B、Heisexaminingapatient.C、Heisattendinghisdaughter.D、Heistakingapatient’shis
A、Hedoesn’thaveextramoneytospend.B、Heneverbuysthingsoverthephone.C、Hedoesn’tneedtheprovidedservice.D、Hedoes
Youarebusyfillingouttheapplicationformforapositionyoureallyneed;let’sassumeyouonceactuallycompletedacouple
MostpeoplewhodevelopLymedisease,atick-borneinfectionthat’sendemicinpartoftheNortheastandMidwest,areeasilycur
Fearisoftena【C1】________emotion.Whenyoubecomefrightened,manyphysicalchangesoccurwithinyourbody.Yourheartbeatand
随机试题
克服组织变革阻力的方法不包括()
设函数f(x)=是连续函数,试求a,b的值.
甲家盖房,邻居乙、丙前来帮忙。施工中,丙因失误从高处摔下受伤,乙不小心撞伤小孩丁。下列哪些表述是正确的?()(14年司考.卷三.多66)
下列各项中,不属于流转税的是()。
下列关于水平型利率期限结构说法中,正确的是()
青年教师职业道德包括()。
如图所示,在AABC中,AB=AC,AB=8,BC=12,分别以AB、AC为直径作半圆,则图中阴影部分的面积为().
结合材料,同答问题:材料1在五千年的历史长河中,作为民族精神的核心,爱国主义始终是中华民族团结统一的精神纽带,始终是凝聚力和向心力的基本源泉,始终是推动中国社会发展进步的巨大力量。这种精神,寄托着对民族命运的拳拳之心,倾注了对中华大地的
设X=10,语句?VARTYPE("X")的输出结果是
ThelargestuniversityinCanadais______
最新回复
(
0
)