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
【B1】 【B9】
【B1】 【B9】
admin
2009-09-12
4
问题
【B1】
【B9】
Scientists have developed a new cancer drug. So far, they have tested it only on laboratory animals. The drag is designed to invade and kill cancer cells but not healthy ceils.
First, the drag enters the cancer and destroys the supply of blood. Then it releases poison to destroy the cancer cells.
Researchers at the Massachusetts Institute of Technology in Cambridge carried out the study. The results appeared in Nature magazine. A school news release called the drug an "anti-cancer smart bomb."
Ram Sasisekharan is a professor at M.I.T. He says his team had to solve three problems. They had to find a way to destroy the blood vessels, then to prevent the growth of new ones. But they also needed the blood vessels to supply chemicals to destroy the cancer.
So, the researchers designed a two-part "nanocell". The cell is measured in nanometers, or one thousand millionth of a meter.The particle used was two hundred nanometers--much, much smaller than a human hair.
The scientists say it was small enough to pass through the blood vessels of the cancer, but it was too big to enter normal blood vessels. The surface of the nanocells also helped them to avoid natural defenses.
The scientists designed the cell as a balloon inside a balloon. They loaded the outer part with a drug that caused the blood vessels to fall in on themselves. That cut off the blood supply and trapped the nanocell inside the cancer. Then, the nanocell slowly released chemotherapy drags to kill the cancer cells.
The team says the treatment shrank the cancer and avoided healthy cells better than other treatments.
选项
答案
The particle used was two hundred nanometers--much, much smaller than a human hair.
解析
转载请注明原文地址:https://kaotiyun.com/show/Xu37777K
0
大学英语四级
相关试题推荐
Anewstudy,publishedintheinternationalscientificjournalNature,revealedthatanestimatedhalfamillioncubickilometer
A、Theyhavenosteeringwheelsorpedals.B、Theyhavebeenaskedtostopfordrivingtoofast.C、Theyhaveneverbeeninvolvedi
A、Posture.B、Eyecontact.C、Gestures.D、Interaction.D
A、Hewillstudysociology.B、Hestudiedsociology.C、HewillhelpthewomanwithherresearchD、Hethinkssociologyistechnical
A、It’stheonlytherapyshegoesthrough.B、Itchangesthewayherbrainworks.C、Itmakesherfeelalwaysyoungandactive.D、I
A、Itisthecentreoftheworld.B、Itisnoteasytoreach.C、Ithasnoroomforlies.D、Itisbrightlikethesun.C
A、Twelve-gradestudents.B、Studentswhosefathersarefarmers.C、Studentslearningagriculture.D、Studentswhohavelearnedmath
A、Itisaninborntrait.B、Itcanbedeveloped.C、Itdependsonintelligence.D、Itiseasytoacquire.B
A、BecauseSamhassomeknowledgeofthelaw.B、BecauseSamhassolvedasimilarproblem.C、BecauseSamknowsMs.Connors.D、Beca
A、Peoplecanhardlyenhancetheirintelligence.B、Peoplearebecomingsmarterastheyage.C、Allpeoplewerebornwiththesame
随机试题
在广告主题中把企业、商标与产品进行有机整合,才有助于树立起企业的整体形象,这是指确定广告主题应注意()。
女,36岁,闭经3个月就医。妇检:子宫大小正常。附件未及异常,孕激素试验阴性,雌一孕序贯治疗后有月经来潮,测LH、FSH均升高。可能的诊断是
根据担保物权的分类,下列各项中,属于法定担保物权的是()。
教师的人格特征对学生的发展起着决定作用,是素质教育的基础。()
对爱国主义与拥护祖国统一的一致性理解正确的有()
[*]
Inrecentdecades,scientistshavebecomeincreasinglyawareoftheparttheobserver【C1】______inthescientificprocess.Inthe
设集合A={{1,2,3},{4,5},{6,7,8}},则下式为真的是(19),设A:{1,2},B={a,L,c},C={c,d},则Ax(B∩C)=(20)。
下面关于Linux内核的有关叙述中,错误的是()。
要将“选课成绩”表中学生的成绩取整,可以使用
最新回复
(
0
)