时间:2019-01-16 作者:英语课 分类:2016年NPR美国国家公共电台11月


英语课

'Minibrains' Could Help Drug Discovery For Zika And For Alzheimer's


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Some tiny brains are making big news this week at the world's largest neuroscience meeting. Minibrains are these lab-created clusters of living human brain cells that mimic 2 some of the functions of actual, fully 3 developed brains. As NPR's Jon Hamilton reports, they are helping 4 scientists answer questions about everything from early brain development to infection with the Zika virus.


JON HAMILTON, BYLINE 5: Unlike real brains, minibrains are made in laboratories - labs like this one at Johns Hopkins University in Baltimore. Hongjun Song, the scientist in charge, takes me to a small, windowless room with a powerful air filtration system. He opens an incubator the size of a dorm fridge and points inside.


HONGJUN SONG: So this is the device we've developed.


HAMILTON: The device is only a bit larger than a cell phone, but Song says it's a complete minibrain factory. The lower half looks like a miniature muffin pan with a dozen separate compartments 6.


SONG: Yeah, we can grow up to five to 10 minibrain in each one.


HAMILTON: These minibrains aren't just random 7 clumps 8 of human brain cells. They contain many of the structures and connections found in real brains. And figuring out how to grow them has taken a lot of work. About three years ago, scientists in Europe showed how to coax 9 brain cells into specializing and organizing much the way a developing brain does. The Hopkins team has streamlined and improved the process. Guo-Li Ming, a professor at Hopkins, says each minibrain is just big enough to see with the naked eye.


GUO-LI MING: It's basically, like, a ball of cells clustering together. But if you open it up, you really see something very similar to the early embryonic 10 brain.


HAMILTON: It's not just that they look like embryonic brains. They also grow the way a brain does in the womb. And that led to a big discovery with a minibrain just a few months ago. It involved the Zika virus, which was suspected of derailing brain development in early pregnancy 11. Ming says she and Hongjun Song, who are married, thought their minibrains might offer a way to figure out what was happening. And by chance, the couple knew a researcher at Florida State University who was studying the Zika virus.


MING: So Hongjun called him right away, saying, well, we have the perfect system to work. Do you have the Zika? And he said yes.


HAMILTON: That call led to experiments in minibrains that showed how the infection was attacking certain critical brain cells. The Hopkins team described this research Sunday during a press conference at the Society for Neuroscience meeting in San Diego. Elsewhere at the meeting, scientists are presenting minibrain research on a range of other diseases and disorders 12, including brain cancer and Down syndrome 13. Thomas Hartung from Hopkins Bloomberg School of Public Health says minibrains may offer a better way for drug companies to test new products.


THOMAS HARTUNG: One company after the other failed on things like stroke, multiple sclerosis, but also new degenerative diseases, like Alzheimer's and Parkinson's.


HAMILTON: Those drugs worked on animals but failed with people. Hartung says that's because animal brains aren't like human brains.


HARTUNG: We need human systems to tell us about humans, and that's why this is such a big step forward.


HAMILTON: One potential obstacle for minibrain research is public acceptance. Hartung says when people hear about scientists growing brains in a lab, they sometimes imagine a fully functioning organ. And in some ways, he says, the clusters are like real brains.


HARTUNG: These cells are communicating. These neurons are talking to each other. You could say it's a primitive 14 type of thinking.


HAMILTON: But Hartung says these brains contain thousands of cells, not billions like a real brain. And even if they could get bigger, they wouldn't be conscious.


HARTUNG: This has nothing to do with consciousness. This has nothing to do with any type of information which is digested here by these cells because they have no input 15.


HAMILTON: So they don't have anything to think about. Jon Hamilton, NPR News.



n.浏览者
  • View edits in a web browser.在浏览器中看编辑的效果。
  • I think my browser has a list of shareware links.我想在浏览器中会有一系列的共享软件链接。
v.模仿,戏弄;n.模仿他人言行的人
  • A parrot can mimic a person's voice.鹦鹉能学人的声音。
  • He used to mimic speech peculiarities of another.他过去总是模仿别人讲话的特点。
adv.完全地,全部地,彻底地;充分地
  • The doctor asked me to breathe in,then to breathe out fully.医生让我先吸气,然后全部呼出。
  • They soon became fully integrated into the local community.他们很快就完全融入了当地人的圈子。
n.食物的一份&adj.帮助人的,辅助的
  • The poor children regularly pony up for a second helping of my hamburger. 那些可怜的孩子们总是要求我把我的汉堡包再给他们一份。
  • By doing this, they may at times be helping to restore competition. 这样一来, 他在某些时候,有助于竞争的加强。
n.署名;v.署名
  • His byline was absent as well.他的署名也不见了。
  • We wish to thank the author of this article which carries no byline.我们要感谢这篇文章的那位没有署名的作者。
n.间隔( compartment的名词复数 );(列车车厢的)隔间;(家具或设备等的)分隔间;隔层
  • Your pencil box has several compartments. 你的铅笔盒有好几个格。 来自《简明英汉词典》
  • The first-class compartments are in front. 头等车室在前头。 来自《简明英汉词典》
adj.随机的;任意的;n.偶然的(或随便的)行动
  • The list is arranged in a random order.名单排列不分先后。
  • On random inspection the meat was found to be bad.经抽查,发现肉变质了。
n.(树、灌木、植物等的)丛、簇( clump的名词复数 );(土、泥等)团;块;笨重的脚步声v.(树、灌木、植物等的)丛、簇( clump的第三人称单数 );(土、泥等)团;块;笨重的脚步声
  • These plants quickly form dense clumps. 这些植物很快形成了浓密的树丛。 来自《简明英汉词典》
  • The bulbs were over. All that remained of them were clumps of brown leaves. 这些鳞茎死了,剩下的只是一丛丛的黃叶子。 来自《简明英汉词典》
v.哄诱,劝诱,用诱哄得到,诱取
  • I had to coax the information out of him.我得用好话套出他掌握的情况。
  • He tried to coax the secret from me.他试图哄骗我说出秘方。
adj.胚胎的
  • It is still in an embryonic stage.它还处于萌芽阶段。
  • The plan,as yet,only exists in embryonic form.这个计划迄今为止还只是在酝酿之中。
n.怀孕,怀孕期
  • Early pregnancy is often accompanied by nausea.怀孕早期常有恶心的现象。
  • Smoking during pregnancy increases the risk of miscarriage.怀孕期吸烟会增加流产的危险。
n.混乱( disorder的名词复数 );凌乱;骚乱;(身心、机能)失调
  • Reports of anorexia and other eating disorders are on the increase. 据报告,厌食症和其他饮食方面的功能紊乱发生率正在不断增长。 来自《简明英汉词典》
  • The announcement led to violent civil disorders. 这项宣布引起剧烈的骚乱。 来自《简明英汉词典》
n.综合病症;并存特性
  • The Institute says that an unidentified virus is to blame for the syndrome. 该研究所表示,引起这种综合症的是一种尚未确认的病毒。
  • Results indicated that 11 fetuses had Down syndrome. 结果表明有11个胎儿患有唐氏综合征。
adj.原始的;简单的;n.原(始)人,原始事物
  • It is a primitive instinct to flee a place of danger.逃离危险的地方是一种原始本能。
  • His book describes the march of the civilization of a primitive society.他的著作描述了一个原始社会的开化过程。
n.输入(物);投入;vt.把(数据等)输入计算机
  • I will forever be grateful for his considerable input.我将永远感激他的大量投入。
  • All this information had to be input onto the computer.所有这些信息都必须输入计算机。
学英语单词
.ttf files
abreauvoir
affix a seal
arborine
autopilot engage and trim indicator
bad copy
battery terminal
block macromolecule
body hoop
bottom gradient electrode system
bulb nose
c-legs
calcaneocuboid articulation
carrier solvent
chinny reckon
Co-ferol
Cohengua, R.
control register instruction
core maximum heat flux (density)
Cortadren
cotton trousers
coupled valve
cursarary
differential earnings from land
diluent modifier
double out
drop-in commercial
ecological climatology
El Orégano
expense not allocated
fermented tea
fertility of soil
frustillatim
fuel refuse-derived
graviditas tuboabdominalis
heading (hdg)
heating systems
hierarchy model
His bark is worse than his bite.
hoglike
hold-over
I/O mode
Ilheus encephalitis
indian chocolates
invoicings
Johnson, Jack
Karvezide
keep one's eye on
khairulins
kick starter spring
krasorskii's method
Kronig's method
lane cake
leptospira tarassovi
lifeline pistol
literary youth
lulita
mean deviations
mediamax
microwave power module
nested sink
noninterchangeable
NSOC
Nupasal
oleostrut
on line service provider
order of reactor
patio doors
perecs
polyphase converter
pound the pavement
proceeding with
program clarity
proper energy
rate of strain tensor
reducing acid radical
regional unconformity
remote operated
rheostatic type automatic power factor regulator
Rosenmmuller's gland
Rzhevsky
sanitary napkin
sea damage for seller's account
self-balancing type
sepr.
servo
set a clock
simple proposition
slicklines
snip-snap
social density
sphero-cylindrical lenticular
St Anthony
staphyloma
telecommunication networks
territorial division of labor
Themistian
turn volume
water trumpet
Wedge Mountain
zizanin
Zyryanskoye