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
For the first time, stem cells purified from fat have been used to heal an injury in a living animal. Michael Longaker of Stanfo
For the first time, stem cells purified from fat have been used to heal an injury in a living animal. Michael Longaker of Stanfo
admin
2012-11-11
112
问题
For the first time, stem cells purified from fat have been used to heal an injury in a living animal. Michael Longaker of Stanford University in California and his team showed in mouse experiments that so-called adipose derived adult stromal (ADAS) cells purified from a rodent’s belly fat could be coaxed to heal a skull fracture too large to mend by itself.
The power of ADAS cells to transform into bone, cartilage and even neurons has been studied for years in test tubes. But Jeffrey Gimble, who studies human ADAS cells at Louisiana State University in Baton Rouge says Longaker’s report is an important step forward. "Actually repairing a defect in an animal model had never been done. This is an excellent study." If the same technique works in humans, these cells could be coaxed to mend broken bones and correct other defects in tens of thousands of surgical procedures each year in which bone grafts and prosthetics are now necessary.
Longaker’s group tested the ability of ADAS cells to heal four-millimetre-long fractures surgically-induced in the skulls of mice. In 12 weeks, the cells filled 70 to 90 per cent of the defects, while untreated animals had only unorganized bone formation in less than 10 per cent of the fractures. No extreme genetic manipulation or treatment of the cells was necessary. ADAS cells began manufacturing bone when they were simply laid onto a biodegradable polymer that contained apatite, a compound that naturally occurs in bone. Furthermore, the ADAS cells performed as well as bone marrow stromal cells, which would seem to be more natural architects of bone. It remains to be seen whether human ADAS cells will build bone as effectively. But researchers are excited about the prospects. Human bone marrow stromal cells are already being used in clinical trials as sources of skeleton-building material, but the ADAS cells may have some significant advantages.
Longaker reports that ADAS cells grow seven times faster than the bone marrow cells in the laboratory. And it is relatively easy to harvest more than a litre of fat tissue, even from patients who are not obese. Bone marrow is much less plentiful and must be removed in a painful surgical procedure. Of course liposuction itself is not a pleasant operation. But according to the American Society of Plastic Surgeons, more than 300,000 people volunteered to have the procedure in 2003 simply for cosmetic reasons. "If the procedure was the first step to healing broken bones or replacing other tissue its popularity could only grow," says Gimble. "Just think of that."
As to ADAS cells, which of the following is NOT localized in laboratory?
选项
A、They are easy to operate.
B、Their abstraction causes no pains.
C、They grow fast.
D、Their yields are larg
答案
B
解析
这是一道细节题。文章最后一段指出:ADAS细胞的生长速度比实验室里骨髓细胞快7倍,而且也相对容易收集,即使是从不肥胖的病人身上收集也不难。这说明,ADAS细胞可以在实验室之外提取。B说“提取ADAS细胞不会引起疼痛”,这与文章的意思符合。文中说的是不需要对这些细胞进行过度的基因控制或处理,并不是说容易控制,所以A不对;文章最后一段是说ADAS细胞的生长速度比实验室里骨髓细胞快7倍,并没有说它们是在何处生长的,所以C不对;文中没有提到D。
转载请注明原文地址:https://kaotiyun.com/show/4Ne4777K
0
考研英语二
相关试题推荐
Heseemedimmune______suchemotionsasjealousy,vanity,bitterness,angerandresentment.
ReadthefollowingtextandanswerquestionsbymarkingTifthestateistrueorFifthestateisnottrue.Tippingisas
Itlookedjustlikeanotheraircraftfromtheoutside.Thepilottoldhisyoungpassengersthatitwasbuiltin1964.Butappear
Itlookedjustlikeanotheraircraftfromtheoutside.Thepilottoldhisyoungpassengersthatitwasbuiltin1964.Butappear
WilltheEuropeanUnionmakeit?Thequestionwouldhavesoundedstrangenotlongago.Noweventheproject’sgreatestcheerlead
Whateverhappenedtothedeathofnewspaper?Ayearagotheendseemednear.Therecessionthreatenedtoremovetheadvertising
Thegreatrecessionmaybeover,butthiseraofhighjoblessnessisprobablybeginning.Beforeitends,itwilllikelychanget
Readthefollowingtextandanswerquestionsbyfindinginformationfromtherightcolumnthatcorrespondstoeachofthemarked
Readthefollowingtextandanswerquestionsbyfindinginformationfromtherightcolumnthatcorrespondstoeachofthemarked
In1999,thepriceofoilhoveredaround$16abarrel.By2008,ithad【1】the$100abarrelmark.Thereasonsforthesurge【2】fro
随机试题
天主教管理一个教省的负责人称为()。
隐语是一种()
患者痫病反复发作不愈、神疲乏力、面色苍白、体瘦、纳呆、大便溏薄、舌质淡、苔白腻、脉沉弱。治宜选用
关于法的本质的说法正确的是()。
砂土和砂质粉土常见的构造有()。
根据《建设工程安全生产管理条例》的规定,施工单位应当在施工组织设计中编制安全技术措施和施工现场临时用电方案,对下列达到一定规模的危险性较大的分部分项工程()编制专项施工方案,并附具安全验算结果,经施工单位技术负责人、总监理工程师签字后实施,由专职
国际货物集装箱运输中,装箱单是详细记载每箱货物的具体资料,又是向海关申报的必要单证,它的英文缩写是()
车间共有50名工人。年底进行考核,有12人业务能力为优,10人政治表现为优,没有一项考核成绩为优的有34人。车间要向上级单位推荐2名两项考核均为优的工人作为先进个人的候选人,问有多少种推荐方案?
中国精神是中华民族的灵魂,是中华民族在五千多年的历史长河中能够生生不息、薪火相传、顽强坚韧、百折不挠、勇往直前的精神特质、精神内核。实现中国梦必须弘扬中国精神,这是因为
SELECT命令中,设置条件短语的关键词是
最新回复
(
0
)