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This is Scientific American's 60-Second Science. I'm Christopher Intagliata. Got a minute?
Birds and sea turtles can migrate thousands of miles, by reading the Earth's magnetic cues. But we too might have magnetic sensing abilities—in our eyes. So says a study in the journal Nature Communications.
Previous studies suggest long-distance migrators—and even fruit flies—pick up magnetic fields with the help of a light-sensitive protein called "cryptochrome." We produce cryptochrome too—without it, our circadian clocks would break. Human cryptochrome doesn't require light to function, though—and it doesn't seem to give us a phenomenal sensitivity to magnetic fields. But can it do more than keep the circadian clock ticking?
To find out, researchers took out fruit flies' usual cryptochrome gene1 and inserted the human version. And the transgenic flies had no problem navigating2 a magnetic maze3 when exposed to light—indicating the human protein can still serve as a light-sensitive magnetic sensor4.
We happen to have a lot of cryptochrome in our retinas—ideally situated5 to receive light. Which suggests we might be able to see magnetic fields in some way. On the other hand, evolution might have just given cryptochrome a new job in new organisms. So don't throw away your GPS.
Thanks for the minute. For Scientific American's 60-Second Science, I'm Christopher Intagliata.
1 gene | |
n.遗传因子,基因 | |
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2 navigating | |
v.给(船舶、飞机等)引航,导航( navigate的现在分词 );(从海上、空中等)横越;横渡;飞跃 | |
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3 maze | |
n.迷宫,八阵图,混乱,迷惑 | |
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4 sensor | |
n.传感器,探测设备,感觉器(官) | |
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5 situated | |
adj.坐落在...的,处于某种境地的 | |
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