Birds and sea turtles can migrate thousands of miles, by reading the Earths magnetic cues. But we too might have magnetic sensing abilitiesin our eyes. So says a study in the journal Nature Communications. [Lauren Foley, Robert Gegear and Steven Reppert, Human Cryptochrome Exhibits Light-Dependent Magnetosensitivity]
Previous studies suggest long-distance migratorsand even fruit fliespick up magnetic fields with the help of a light-sensitive protein called cryptochrome. We produce cryptochrome toowithout it, our circadian clocks would break. Human cryptochrome doesnt require light to function, thoughand it doesnt seem to give us a phenomenal sensitivity to magnetic fields. But can it do more than keep the circadian clock ticking?考试大考试大成就你的梦想
To find out, researchers took out fruit flies usual cryptochrome gene and inserted the human version. And the transgenic flies had no problem navigating a magnetic maze when exposed to lightindicating the human protein can still serve as a light-sensitive magnetic sensor.
We happen to have a lot of cryptochrome in our retinasideally situated 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 dont throw away your GPS.
职称英语阅读理解综合类考试练习(5)
职称英语《综合类》考试阅读理解练习以及答案(5)
职称英语《综合类》考试阅读理解必备练习(5)
职称英语《综合类》考试阅读理解必备练习(3)
2015职称英语考试理工类B级阅读理解练习(3)
职称英语《综合类》考试阅读理解练习以及答案(4)
2015职称英语考试理工类B级阅读理解练习(4)
2015职称英语考试理工类B级阅读理解练习(5)
职称英语《综合类》考试阅读理解必备练习(2)
2015职称英语考试理工类AB级阅读判断(5)
职称英语《综合类》考试阅读理解必备练习(1)
2015职称英语考试理工类AB级阅读判断(4)
阅读理解职称英语综合类必备练习(5)
2015职称英语理工类英语阅读理解(2)
2015职称英语考试理工类阅读理解复习(1)
2015职称英语考试理工类阅读理解(2)
2015职称英语考试理工类基础练习之阅读理解(2)
2015职称英语A级考试阅读理解综合类专项练习(4)
2015职称英语考试理工类阅读理解专项练习题(4)
2015职称英语考试理工类AB级阅读判断(3)
职称英语《综合类》考试阅读理解必备练习(4)
2015职称英语考试阅读理解综合类经典练习(4)
2015职称英语考试理工类B级阅读理解练习(2)
2015年职称英语A级阅读理解综合类精选练习题(3)
2015职称英语理工类英语阅读理解(5)
2015职称英语A级考试阅读理解综合类专项练习(2)
2015职称英语考试理工类阅读理解(4)
2015职称英语理工类阅读理解试题练习(3)
2015职称英语考试阅读理解综合类经典练习(1)
2015职称英语A级考试阅读理解综合类专项练习(1)
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |