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
Two techniques have recently been developed to simplify research and reduce the number of nonhuman primates needed in studies of
Two techniques have recently been developed to simplify research and reduce the number of nonhuman primates needed in studies of
admin
2013-01-25
39
问题
Two techniques have recently been developed to simplify research and reduce the number of nonhuman primates needed in studies of certain complex hormonal reactions. One technique involves the culturing of primate pituitary cells and the cells of certain human turnouts. In the other, animal oviduct tissue is transplanted under the skin of laboratory primates. Both culturing techniques complement existing methods of studying intact animals.
With an in vitro culturing technique, researchers are deciphering how biochemical agents regulate the secretion of prolactin, the pituitary hormone that promotes milk production. The cultured cells survive for as long as a month, and they do not require serum, a commonly used culture ingredient that can influence cellular function and confound study results. One primate pituitary gland may yield enough cells for as many as 72 culture dishes, which otherwise would require as many animals.
The other technique allows scientists to monitor cellular differentiation in the reproductive tracts of female monkeys. While falling short of the long-sought goal of developing an in vitro model of the female reproductive system, the next-best alternative was achieved. The method involves transplanting oviduct tissue to an easily accessible site under the skin, where the grafted cells behave exactly as if they were in their normal environment. In about 80 percent of the grafts, blood vessels in surrounding abdominal skin grow into and begin nourishing the oviduct tissue. Otherwise, the tissue is largely isolated, walled off by the surrounding skin. A cyst forms that shrinks and swells in tandem with stages of the menstrual cycle. With about 80 percent of the grafts re-establishing themselves in the new site, a single monkey may bear as many as 20 miniature oviducts that are easily accessible for study. Because samples are removed with a simple procedure requiring only local anaesthesia, scientists can track changes in oviduct cells over short intervals. In contrast, repeated analysis of cellular changes within the oviduct itself would require abdominal surgery every time a sample was taken--a procedure that the animals could not tolerate.
Scientists are using the grafting technique to study chlamydia infections, a leading cause of infertility among women. By infecting oviduct tissues transplanted into the abdominal skin of rhesus monkeys, researchers hope to determine how the bacteria cause pelvic inflammatory disease and lesions that obstruct the oviduct. Such research could eventually lead to the development of antibodies to the infectious agent and a strategy for producing a chlamydia vaccine.
This passage deals primarily with ______.
选项
A、reproductive organs of nonhuman primates
B、diseases of the pituitary glands
C、in vitro studies of pituitary hormones
D、techniques for studying hormonal reactions
答案
D
解析
本文主要论述研究激素反应的两种方法。第一段首句可以看作是全文的主题句,它概括了全文的主要内容,即讨论两种新的研究方法。
转载请注明原文地址:https://kaotiyun.com/show/2L1O777K
0
考博英语
相关试题推荐
A、countB、reflectC、dependD、commentBcount意为“考虑”,但常用于count…as…的结构中;reflect意为“思考,回顾”;depend意为“依靠,信任”;comment意为“评论,发表意见”。联系上下旬可知,
Thefarmersweremoreanxiousforrainthanthepeopleinthecitybecausetheyhadmoreat____.
WhenaScottishresearchteamstartledtheworldbyrevealingthreemonthsagothatithadclonedanadultsheep,PresidentClin
ForumfortheFuture,workingwithTescoandUnilever,reckonthatby2022whatwebuy,howwebuyitandwhofromwillhavechange
Thepatients_____symptomstogetappointmentsquickerandaskdoctorstohidethetruthfrominsurancecompanies.
Anyearthquakethattakesplaceinanyareaiscertainlyregardedasakindofa_______event
Itisnotforbiddentodreamofbuildingabetterworld,whichisbyandlargewhatthesocialsciencestrytohelpustodo.Ho
Frenchareelegantpeople.Theyareartistsineverydaylife,havingaverygoodtasteineverything.Theydon’tlikeAmericant
HenryDavidThoreauusedtoramblethroughthewoodsbeforehewrotehismostfamousbookWalden(1854).
随机试题
我国经营素食的名店有()。
心境
Agenerationgaphasbecomeaseriousproblem,especiallybetweenparentsandchildren.Ireada(n)【B1】______aboutitinthenew
患者,女性,49岁,间断上腹部饱胀、恶心1年。患者1年前无明显诱因出现恶心、上腹饱胀感,自行服用胃药(具体不详)治疗后症状好转。2个月前患者上述症状再次发作,查体:上腹部轻微压痛,无反跳痛。胃镜、腹部B超检查未见明显异常。诊断:功能性消化不良。医嘱:枸橼酸
海水侵蚀作用的动力,包括()等三个方面。
背景材料:某路桥公司承包了某高速公路标段路面工程的施工任务,在施工过程中,沥青混凝土摊铺机连续发生机械设备事故,导致该标段没有按合同规定的日期完成施工任务。问题:发生机械设备事故后,应按怎样的程序进行处理?
小王出差回来报销差旅费2700元,原借3000元,交回多余现金300元。应编制()。
近视:眼镜
写一篇靳秀忠的事迹材料。(400字)文中的“自主权”指什么?
“芳林新叶催陈叶,流水前波让后波。”“千门万户瞳瞳日,总把新桃换旧符。”这两句诗所蕴含的哲学道理是
最新回复
(
0
)