A minor or isolated reaction can become chronic with repeated exposure to an allergen, or when other cells involved in the immune system, the t cells, come into play.
一开始轻微并单一的反应也可能因为反复接触同一过敏原，或者其它的细胞比如T细胞的参与反应而变成慢性症状。
Often, the psychological problem is not isolated, it is likely to be a chain reaction of a certain event.
通常情况下，心理问题不是孤立存在，很可能是某个事件的连锁反应。
Neither polymethylmethacrylate nor polymethylmethacrylate-grafted copolymer could be isolated by the reaction of polystyrene methylene lithium prepared in ether solution with methyl methacrylate.
在乙醚溶液制得的聚苯乙烯次甲基锂与甲基丙烯酸甲酯反应不能分离出聚甲基丙烯酸甲酯及它的接枝共聚物。
In addition, 6 pure cultures isolated from dead fish dead infected artificially were inspected through agglutination test, special agglutinative reaction appeared also.
同时，对从人工感染死亡牙鲆分离的6株纯培养菌以凝集试验进行了检验，亦显示特异凝集反应。
The reaction can be repeated on the isolated solids to increase the purity of ferric oxide in the solids.
反应可以在分离的固体上重复以增加固体中氧化铁的纯度。
The amidocarbonylation reaction conditions were optimized and 66.4% isolated yield of racemic N-acetylleucine were obtained.
文中对酰胺羰基化反应条件进行了优化，分离得到消旋N-乙酰基亮氨酸产率为66.4%。
Biochemical reaction, coagglutination test, metabolism inhibition test, polymerase chain reaction (PCR) assay, and DNA sequencing were employed to identify the isolated microorganisms.
阳性培养物用生化反应、协同凝集试验、代谢抑制试验、聚合酶链反应和DNA序列测定等方法进行鉴定。
We isolated ECs from human AVM and aneurysm and then confirmed their EC origin by polymerase chain reaction and immunocytochemistry with endothelial markers.
我们将人脑动脉瘤和动静脉血管畸形中的内皮细胞分离出来，并用内皮标志物结合多聚酶链反应和免疫组化等方法确认其内皮来源性。
A prototype enzyme catalyzing such a reaction has recently been isolated from the venom of the funnel web spider.
催化这种反应的一种原型酶最近已经从漏斗网蜘蛛的毒液中被分离。
Objectives: To study the reaction of the isolated working hearts of rats when the coronary pressure is changed.
目的：研究离体作功心脏对其冠脉压强变化的反应。
This system also can catalyze the reaction of benzene with alkyl chloride, in which only the desired diphenylmethane is isolated in good yield (5 equiv. ).
催化烷基氯和苯的反应，其中二氯甲烷和苯反应得到5倍量的单一产物二苯甲烷。
This system also can catalyze the reaction of benzene with alkyl chloride, in which only the desired diphenylmethane is isolated in good yield (5 equiv. ).
催化烷基氯和苯的反应，其中二氯甲烷和苯反应得到5倍量的单一产物二苯甲烷。
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