首页
登录
职称英语
Two techniques have recently been developed to simplify research and reduce th
Two techniques have recently been developed to simplify research and reduce th
游客
2023-12-15
18
管理
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 (垂体) cells and the cells of certain human tumors. In the other, animal oviduct (输卵管) tissue is transplanted under the skin of laboratory primates. Both culturing techniques complement existing methods of studying intact (完整的) animals.
With an in vitro culturing technique, researchers are deciphering how biochemical agents regulate the secretion of prolactin (催乳激素), the pituitary hormone that promotes milk production. The cultured cells survive for as long as a month, and they do not require serum (血清), 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 (囊胞) forms that shrinks and swells in tandem(一前一后的串联) with stages of the menstrual cycle. With about 80 percent of the grafts reestablishing 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 anesthesia, 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 (衣原体) infections, a leading cause of infertility among women. By infecting oviduct tissues transplanted into the abdominal skin of rhesus (罗猴) monkeys, researchers hope to determine how the bacteria cause pelvic inflammatory disease and lesions (损害) 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. [br] According to the passage, Chlamydia causes infertility in women by ______.
选项
A、causing tissue changes which block the oviduct
B、shrinking and swelling tissues in conjunction with the menstrual cycle
C、allowing skin tissue to encyst reproductive tissue
D、necessitating abdominal surgery to remove damaged tissue
答案
A
解析
这也是一道细节题。文中的最后一段论述了题目的内容,这里作者讲了the infection causes lesions which obstruct the oviduct。这在A选项中得到了很好的总结。B与C都是错的。它们的内容在文中是提到了,但它们都是答非所问。它们讲到了如何进行研究却没有提及妇女患不育症的原因。D可能是仅次于A的最好答案。它讲到了tissue damage,但文中并没有谈及切除损害组织手术的必要性。或许我们可以推想这是一种合适的医疗手段,但这种手段并未在文中特别提及。
转载请注明原文地址:https://tihaiku.com/zcyy/3276761.html
相关试题推荐
Criticismofresearchlaysasignificantfoundationforfutureinvestigative
Criticismofresearchlaysasignificantfoundationforfutureinvestigative
Criticismofresearchlaysasignificantfoundationforfutureinvestigative
HowMarketLeadersKeepTheirEdgeResearchfindsthatthere
HowMarketLeadersKeepTheirEdgeResearchfindsthatthere
HowMarketLeadersKeepTheirEdgeResearchfindsthatthere
HowMarketLeadersKeepTheirEdgeResearchfindsthatthere
AsoneofthedevelopedcountriesinAsia,Japanhasbeensoughthegemonyin
AsoneofthedevelopedcountriesinAsia,Japanhasbeensoughthegemonyin
AsoneofthedevelopedcountriesinAsia,Japanhasbeensoughthegemonyin
随机试题
烟气的危害性有多种,()不属于烟气的危害性。A.毒害性 B.减光性 C
对安全事故隐患整改要区别不同的事故隐患类型,按照()的“三定”原则制定相应
下列既属六腑,又属奇恒之腑的是()。A.脑B.脉C.三焦D.胆E.骨
A.棘阿米巴可致B.广州管圆线虫可致C.溶组织内阿米巴可致D.弓形虫可致E.耐格
接地引下线无()和断裂,与设备、接地网接触良好,防腐处理完好。松脱$;$锈
【二次回路】11、断路器合闸时,断路器合闸回路会自保持,切断合闸自保持回路的是(
城市生命的源泉,社会、经济发展的基础是()A.矿产资源 B.土地资源 C
根据凯恩斯消费理论的三个假设,如果消费和收入之间存在线性关系,则边际消费倾向为(
下列主体可以成为有限合伙企业中普通合伙人的是()。A.上市公司 B.公益
在建设项目的设计阶段,进行限额设计目标设置的关键环节是()A、合理划分各专业、各
最新回复
(
0
)