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
考研
In a state-of-the-art clean room, a scientist clad in a full-body containment suit, a hair net and blue gloves is preparing some
In a state-of-the-art clean room, a scientist clad in a full-body containment suit, a hair net and blue gloves is preparing some
admin
2022-03-27
45
问题
In a state-of-the-art clean room, a scientist clad in a full-body containment suit, a hair net and blue gloves is preparing some printing cartridges—filled not with ink but a viscous milky liquid. Next to her sits a computer connected to a machine that resembles a large ice-cream dispenser, except that each of its two nozzles is made of a syringe with a long needle. Once the scientist clicks on the "run program" button, the needles squeeze not a vanilla or chocolate flavoured treat, but a paste of living cells.
Forty minutes later, the task is finished. Depending on the choice of bioink and printing pattern, the result could have been any number of three-dimensional biological structures. In this case, it is a strand of living lung tissue about 4cm in length and containing about 50m cells.
Since its start in 2007, researchers at San Diego-based Organovo have experimented with printing a wide variety of tissues, including bits of lung, kidney and heart muscle. Now the world’s first publicly traded 3D bioprinting company is gearing up for production. In January samples of its first product—slivers of human liver tissue—were delivered to an outside laboratory for testing. These are printed in sets of 24 and take about 30 minutes to produce, says Keith Murphy, the firm’s chief executive. Later this year Organovo aims to begin commercial sales.
Each set consists of a plate with 24 wells containing a piece of liver tissue 3 mm square and 0. 5mm deep. Although prices have not been fixed, a set of tissues like this can sell for $2,000 or more for laboratory use. It might seem expensive, but it could save pharmaceutical companies a lot of money. This is because Organovo’s research indicates that the slivers of liver respond to drugs in many ways like a fully grown human liver would. If this is confirmed by outside testing, researchers could use the printed tissues to test the toxicity of new drugs before deciding whether to embark on expensive clinical trials with patients.
The invention of 3D printing in the 1980s provided a technology now used to manufacture everything from aircraft parts to prosthetic limbs. But the promise of 3D bioprinting is even larger; to create human tissues—layer by layer—for research, drug development and testing, and ultimately as replacement organs, such as a kidney or pancreas, for patients desperately in need of a transplant. Bioprinted organs could be made from patients’ own cells and thus would not be rejected by their immune systems. They could also be manufactured on demand.
At present only a handful of companies are trying to commercialize the production of bioprinted tissues. But Thomas Boland, an early pioneer in the field, says that plenty of others are interested and estimates that about 80 teams at research institutions around the world are now trying to print small pieces of tissues as varied as skin, cartilage, blood vessels, liver, lung and heart. " It’s a wonderful technology to build three-dimensional biological structures," says Gabor Forgacs, who co-founded Organovo in 2007 and was the company’s scientific mastermind.
选项
答案
F
解析
根据Thomas Boland定位到最后一段第二句:But Thomas Boland,an early pioneer in the field,says that plenty of others are interested and estimates that about 80 teams at research institutions around the world are now trying to print small pieces of tissues as varied as skin,cartilage,blood vessels,liver,lung and heart. 与该句内容相近的选项是F项reckoned that bioprinting appealed to a majority of companies“认为生物打印会吸引许多公司”,该项与plenty of others are interested“许多公司对此感兴趣”一句是同义替换,故F为本题答案。
转载请注明原文地址:https://kaotiyun.com/show/5Qi4777K
0
考研英语二
相关试题推荐
Nowadays,wehavetechnologythat’simprovedsothatwecanbringpeoplebacktolife.Infact,therearedrugsbeingdeveloped
Bysayingthatacountry’sagriculturalsurplusesoften"complicate"itseconomy,theauthormeans______.Itcanbeinferredt
Excitement,fatigue,andanxietycanallbedetectedfromsomeone’sblinks,accordingtopsychologistJohnStern(21)Washington
Excitement,fatigue,andanxietycanallbedetectedfromsomeone’sblinks,accordingtopsychologistJohnStern(21)Washington
Theoppositionpartydemandsthatthosecabinetmemberswhoareinvolvedintherecentscandalshould______.
ReadthefollowingtextandanswerquestionsbymarkingTifthestateistrueorFifthestateisnottrue.Tippingisas
Workingatnonstandardtimes—evenings,nights,orweekends—istakingitstollonAmericanfamilies.One-fifthofallemployedAm
SupposeyouarethemarketingmanagerofABCCompany.YouwanttoinviteProf.Whitetodeliveraspeechforthebanquetthatcl
Thebattletopreventoratleastslowglobalwarminghasintensifiedinthepastyearasscientistshavelearnedmoreaboutthe
Neuroscientistshavelongunderstoodthatthebraincanrewireitselfinresponsetoexperience—aphenomenonknownasneuroplast
随机试题
对于氮、硫含量较高的原料,可通过加氢精制的方法进行脱硫脱氮预处理。()
A.苍白无华B.色素沉着C.面如满月D.面容臃肿E.丑陋容貌库欣综合征
属于次级胆汁酸的是
对砌筑不严密的砖缝,应打入()塞紧。
对某一土样,在一定的击实功作用下,只有()。
资料1中外合资沈阳贝沈钢帘线有限公司(2101232999)使用自有资金,委托上海新元五矿贸易公司(3105913429)持2100-2003-WZ-00717号自动进口许可证(代码:7)进口镀黄铜钢丝(法定计量单位为千克)。货物到港后,报关代理
下列属于银行总成本的支出有()。
作为地陪,在确定叫早时间时应与()商量。
在探讨某种教学方法对儿童运算能力影响的研究中,运算能力是
矩阵相似的充分必要条件为().
最新回复
(
0
)