人浏览 目前经过哈勃太空望远镜所拍摄图片分析所得出的结论是来自星团的炽热气体是在水母星系群后面 A recently discovered breed of galaxies really caught astronomers'attention...> 英语听力 > 英语新闻 > 科学美国人英语科学新闻
Out of control drivers aren't the only thing city cyclists have to worry about. New research suggests that cyclists are at increased risk of lung damage because of soot.
A study compared people who walk or bike to work, to see how much black carbon they were exposed to. And cyclists had more soot in their lungs than walkers.
The research was presented at the European Respiratory Society's Annual Congress in Amsterdam on Sunday.
Researchers at the London School of Medicine collected sputum samples from healthy non-smokers who walk or bike to see how much black carbon was in airway macrophages—a type of white blood cell that takes in foreign material. The analysis found that cyclists had 2.3 times more soot in their airway cells.
Cyclists take in more black carbon because they breathe faster and deeper than walkers. And they're on the road, closer to exhaust fumes than sidewalk pedestrians are.
The ongoing study will address more questions about benefits and risks of healthy modes of transportation. But for now, I'd steer clear of high traffic areas.
这项研究发表在近期的《国家科学院学报》上. If the lab results hold up out in the world, the silk safeguard could save billions of dollars, and millions of lives. 如果实验结果被全世界所...
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人浏览 研究人员随后发现他们能够根据之前步伐中的骨盆运动,精确地预测每一脚的落点 How many times has this happened to you? You start to fall, but then catch yourself and ...