试题与答案

简述抗球蛋白试验的原理。

题型:问答题 简答题

题目:

简述抗球蛋白试验的原理。

答案:

参考答案:

红细胞表面包被了IgG抗体分子或补体分子C3、C4的片段,但不能产生凝集现象。IgG抗体和补体都是人球蛋白,以此免疫动物,或用杂交瘤(hybridoma)技术可以得到抗球蛋白,这类抗体的特异性是针对IgG分子的Fc段或补体C3、C4的片段,可以和包被在红细胞上的抗体分子和补体分子作用,使红细胞发生凝集,抗球蛋白分子起着搭桥的作用。红细胞包被的抗体还可以是IgA或IgM,这必须用相应的抗IgA和抗IgM才能检出。

抗球蛋白试验可分直接法和间接法。直接法是检测体内被抗体或(和)补体致敏的红细胞,如自身免疫性溶血性贫血和新生儿溶血病的诊断等;间接法是检测红细胞在体外致敏的方法,亦即检测血清中有无游离的不完全抗体,可用于检测孕妇Rh抗体和鉴定Rh血型等。

试题推荐
题型:完形填空

第二节:完形填空(.共20小题每小题1分,满分20分)   

阅读下下面短文,从后各题所给的,四个选项(A、B、C、D)中,选出最隹选项。

I was walking downa.darkly lit street late one,evening when I heard ambiguous screams coming from behind bushes.Alarmed,I  36  to listen, and panicked  37  I realized that what l WaS hearing were the,definite sounds.of  a  38  :heavy noise, and tearing of cloth.

A woman was beingattacked. Should I get  39   ?1 was frightened for my own   40 , and blamed myself for having  41  decided to take a new route home that night.Shouldn't I justrunto the nearest phone and call the  42  ?

Although it seemed an etemity(漫长),the deliberations in my head had  43  only sec-onds, but already the girl's cries were growing   44  I knew I had to act fast. How  45  I  walk away from this? No,Ifmally determined,  I  could not tum my back on the  46  of  this Unknown woman, even if it meant  47   my ownlife.

I am not a brave man, nor amI athletic.I don't know where I found the moral  48     and physical strength- but once I had finally determined to help the girl,I became strangely    49  I ran behind the bushes and pulled.the attacker  50   the woman. Grasping, wefell to the ground, where we wrestled for a few mrnutes until the manjumped up and escaped.

Breathing hard,I stood upright and   51  the  girl, who stayed down behind a tree, sob-bing.In the darkness,I could barely see her outline, but I could certainly  52  her trem-bling shock.Not wanting to frighten her further,I  53  spoke to her from a distance. "The man ran away. You're safe now.’’There was a long pause and then I heard the words, said in  wonder, in  54 ."Dad, is that you?" And then, from behind the tree, out  55  my  youngest daughter, Katherine.

36.A.broke down   B.slowed down   C.calmed down  D.tumed down

37.A.when        B.until        C.before         D.though

38.A.quarrel        B.conversation  C.struggle        D.dispute

39.A.involved      B.informed     C.conquered    D.deserted

40.A.property      B.safety          C.appearance    D.presence

41.A.quickly        B.bravely        C.suddenly      D.cleverly

42.A.friend          B.neighbour    C.folk         D.police

43.A.abandoned          B.covered       C.held        D.taken

44.A.louder         B.clearer         C.weaker        D.heavier

45.A.should         B.could       C.would          D.must

46.A.fate         B.face         C.moment       D.spot

47.A.saving         B.risking         C.losing          D.devoting

48.A.lesson          B.spirit       C.story       D.courage

49.A.behaved       B.performed    C.transformed   D.Expressed

50.A.off          B.down         C.from       D.over

51.A.attended      B.appreciated  C.negotiated     D.approached

52.A.sense       B.feel         C.observe        D.hear

53.A.after all       B.at first         C.as well         D.asa result

54.A.surprise       B.disappointment C.sorrbw         D.amazement

55.A.cried       B.looked         C.stepped        D.showed

查看答案
微信公众账号搜索答案