十万个为什么·科学阅读30篇（4）
24 / 30
正在确认阅读权限…
How Do Magnetotactic Bacteria Navigate Using Earth’s Magnetic Field?
趋磁细菌如何利用地球磁场导航？
-
Magnetotactic bacteria live in oxygen-poor mud at pond and ocean bottoms.
-
They build chains of magnetic iron crystals called magnetosomes inside their cells.
-
These crystals align like tiny compass needles, orienting the whole bacterium north-south.
-
In the Northern Hemisphere, they swim downward along magnetic field lines toward safer sediments.
-
In the Southern Hemisphere, their polarity flips so they still move downward geographically.
-
This navigation helps them avoid toxic oxygen-rich surface waters quickly and efficiently.
-
Researchers use electron microscopes to image magnetosome arrangement in single cells.
-
Synthetic versions of these nanoparticles now guide drug delivery in human medicine.
-
Their simple biology solves a complex physics problem without nerves or brains.
-
Studying them reveals how life harnesses planetary forces at microscopic scales.