This magnetite basically helps them to orient in the right direction.

这种磁铁基本上可以帮助它们以正确的方向定向。

The turtles have particles of magnetite, a magnetic mineral, in their brains.

海龟的大脑中有磁铁，这是一种磁性物。

Like peanuts, magnetite is more dense and should sit at the bottom.

像花生一样，磁铁的密度更大，所以应底部。

Sure enough, groups of magnetite grains had materialised on the treated squares, shepherded into place by the bacterial protein.

果然，" 棋盘" 上的固定蛋白质区域产生了成群的磁铁，并由细菌蛋白质控制在相应置。

The magnetite likely plays a role in orienting sea turtles to Earth's magnetic poles, similar to a compass.

磁铁可能在将海龟定向到地球磁极方面起作用，类似指南针。

The first theory is that animals have tiny magnetite particles in their bodies that act as magnetic receptors.

第一个理论是，动物体内有微小的磁铁，作为磁感受器发挥作用。

Which, again, are magnetite. Over here are iron oxide.

又是磁铁。这里是氧化铁。

The very first magnets that anyone knew about were natural magnets called lodestone or magnetite.

人们所知道的第一个磁铁是天然磁铁，称为磁石或磁铁。

Third, it just doesn't make sense that bacteria on Mars would produce magnetite.

第三，火星上的细菌会产生磁铁是没有意义的。

A lot of homing pigeons also have what is called magnetite in their beaks and magnetoreceptors in their nervous system or brains.

很多信鸽的喙中也有所谓的磁铁，神经系统或大脑中有磁感受器。

Earth bacteria have the magnetite grains because they allow them to follow the Earth's strong magnetic field.

地球细菌具有磁铁， 因为它们使它们能够跟随地球的强磁场。

It's much too weak to follow, which means that magnetite grains would be completely useless to Martian bacteria.

它太弱了，无法追踪，这意味着磁铁对火星细菌来说完全没有用处。

These dots are points in time when we have data from magnetite for different chunks of crust, and there are big gaps.

这些点是我们在地壳的不同块状物中从磁铁获得数据的时间点，而且存在很大的空白。

But there's actually a more precise way to tell that Africa was once near the South Pole, and once again, it's magnetite.

实际上， 有一种更精确的方法可以证明非洲曾靠近南极，那就是磁铁。

The same process could also explain why volcano scientists find that the mineral magnetite rises to higher layers in Earth's crust than would be expected.

同样的过程也可以解释为什么火山科学家发现物磁铁在地壳中能上升到比预期更高的层。

For a start, the grains of magnetite are not strong enough magnets to make a useful memory, and the size of each domain (20 microns across) is huge by modern computing standards.

首先对可用的存储器来说，那些磁铁的磁性还不够强大，并且每个区域的尺寸（20微米的跨度）对现在计算机标准来说太大了。

Magnetic fields pass invisibly through the entire body so researchers don't know exactly where these magnetite particles or cryptochromes would be attached to particular cells and so mistakes are made all the time.

磁场无形地穿过整个身体，所以研究人员不知道这些磁铁或隐色体会准确地附着在特定的细胞上，所以导致犯错。

The researchers took their inspiration from Magnetospirillum magneticum, a bacterium that is sensitive to the Earth's magnetic field thanks to the presence within its cells of flecks of magnetite, a form of iron oxide.

研究人员从趋磁细菌上获得了灵感，由细菌内部存在铁氧化物磁性，所以对地球磁场非常敏感。