onitrobenzyl (ONB). When they catch the light, ONB groups fall off the polymer, leading to its breakdown. But ONB is only a soso NIR absorber, and it could be poisonous to cells when it separates from the polymer.
So Almutairi and her colleagues reported creating a new material for capsules that's even better. This one consists of a long chain of compounds called cresol groups linked in a polymer. Cresol contains reactive (易反应的) components that make it highly unstable in its polymeric form, a feature Almutairi and her colleagues use to their advantage. After polymerizing the cresols, they cap each reactive component with a lightabsorbing compound called Bhc. When the Bhcs absorb NIR light, the reactive groups are exposed and break the long polymer into two short chains. Shining additional light continues this breakdown, potentially releasing any drugs in the capsule. What's more, Almutairi says, Bhc is 10 times better at absorbing NIR than is ONB and is not poisonous to cells.
1. According to the passage, which of the following could be the best trigger?
A. Temperature change.
B. NIR light.
C. Acidity change.
D. UV light.
2. Why is ONB unsatisfactory?
A. It breaks down when it absorbs NIR light.
B. It falls off the polymer and triggers drug release.
C. It has not come onto the market up till now.
【2016届湖南长沙市高考英语二轮阅读理解训练(63)(含答案)】相关文章:
★ 重庆市2014高考英语阅读理解一轮(精品)训练题(18)附答案
★ 【课堂新坐标】2017届高考英语(通用版)二轮复习书面表达专题训练:Ⅱ卷强化增分练 训练3(含解析)
★ 贵州省贵阳市2014高考英语(新人教版)一轮阅读训练(20)附答案
★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (58)
★ 河南省三门峡市2014高考英语一轮(暑假)基础训练(5)附答案
★ 【课堂新坐标】2017届高考英语(通用版)二轮复习书面表达专题训练:训练6 议论文+记叙文(含解析)
★ 湖南省岳阳市2014高考英语一轮单项选择训练题(9)及答案
★ 河南省三门峡市2014高考英语一轮(暑假)基础训练(4)附答案
★ 2017年高考英语二轮复习精品资料:专题15 完形填空(押题专练)(原卷版)
最新
2017-04-24
2017-04-24
2017-04-24
2017-04-24
2017-04-21
2017-04-21