Bringing Nanotechnology to Health Care for the Poor
Nanotechnology uses matter at the level of molecules and atoms. Researchers are finding different uses for particles with a length of one nanometer, or one-billionth of a meter. These include things like beauty products and dirt-resistant clothing. But one area where many experts believe nanotechnology holds great promise is medicine.
Last week, speakers at a program in Washington discussed using nanotechnology to improve health care in developing countries. The program took place at the Woodrow Wilson International Center for Scholars. Peter Singer at the University of Toronto says a nanotechnology called quantum dots could be used to confirm cases of malaria. He says it could offer a better way than the traditional process of looking at a person's blood under a microscope.
In poor countries, this process is often not followed. As a result, sick people may get treated for malaria even if they do not have it. Such misuse of medicines can lead to drug resistance. Quantum dots are particles that give off light when activated. Researchers are studying ways to program them to identify diseases by lighting up in the presence of a targeted molecule.
Experts say nanotechnology shows promise not just for diagnosing diseases, but also for treating them. Piotr Grodzinski of the National Institutes of Health talked about how nanotechnology could make drugs more effective. He talked about cancer drugs already developed with nanotechnology. He says if a drug can target a cancer locally in the body, then much less of it might be needed, and that means lower side effects.
Andrew Maynard is chief scientist for the Project on Emerging Nanotechnologies at the Woodrow Wilson Center. He noted that Brazil, India, China and South Africa are currently doing nanotechnology research that could help poor countries. But he also noted that there is some risk in using nano-materials. He says nanometer-sized particles behave differently in the body and the environment compared to larger particles. Experts say more investment in research is needed to better understand these risks.
Which of the following uses of nanotechnology is NOT mentioned in the passage?
A.To make beauty products and dirt-resistant clothing.
B.To produce better and lighter building materials.
C.To help more accurately diagnose diseases.
D.To help more effectively treat diseases.
第2题
A.启闭机械、电气设备、电源(或动力设备)是否完好
B. 闸门的悬吊装置是否牢固可靠
C. 闸门的位置是否正常,是否在原位,有无倾斜
D. 启闭机械运行是否正常
第3题
A.启闭机械、电气设备、电源(或动力设备)是否完好
B.闸门的悬吊装置是否牢固可靠
C.闸门的位置是否正常,是否在原位,有无倾斜
D.启闭机械运行是否正常
第4题
A. 在闸门启闭过程中,观察滚轮是否转动。其运转是否灵活,直接影响着闸门的运行。
B. 在闸门提出水面后,用手拨动滚轮,观察其是否转动灵活。若水闸主、侧滚轮发生失灵,长期变滚动为滑动,磨阻力加大,闸门启闭机械超负荷运行,造成设备损伤。
C. 闸门启闭时有无异常响声
D. 工作完毕,应及时做好记录
第5题
B.在闸门提出水面后,用手拨动滚轮,观察其是否转动灵活。若水闸主、侧滚轮发生失灵,长期变滚动为滑动,磨阻力加大,闸门启闭机械超负荷运行,造成设备损伤。
C.闸门启闭时有无异常响声
D.工作完毕,应及时做好记录
第7题
A.闸门部分开启时,应检查闸门是否有振动现象
B. 闸门的悬吊装置是否牢固可靠
C. 闸门的位置是否正常,是否在原位,有无倾斜
D. 启闭机械运行是否正常
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