Sentences with phrase «magnetite grains»

So - called magnetotactic bacteria create a chain of magnetite grains to help orient themselves in their search for nutrients.

It's improbable that Martian microbes deposited magnetite grains directly in the rock, so Thomas - Keprta and her colleagues have to argue that the magnetite formed outside of the rock and washed in.

However, the magnetite grains found in the carbonate globules of ALH84001 have very few of these sorts of substitutions.

Within the smallest magnetite grains are regions that have their own individual magnetizations and work like a tape recorder.

Not exact matches

The meteorite is full of grains of an iron oxide mineral called magnetite, each grain a mere 20 to 120 nanometers across.

When the scientists examined the cells in the growing communities closely, they found nanoparticles of magnetite on the surface of cells and, in some cases, grains of the iron mineral connecting microbial pairs.

He and Kent used a bandsaw to trim the samples into sugar cube - size blocks and inserted them into a magnetometer, which measured the polarity of tiny grains of the minerals hematite and magnetite contained in the sediment.

Microscopic grains inside magnetite are capable of storing information about the planet's magnetic field, including the direction and intensity, from the time the minerals cooled and solidified.

In 2001, she and her colleagues showed that many of the same properties in biologically - derived magnetite are reproduced in the grains from ALH84001.

In the end, she helped the team characterize the biomorphic features, as well as unusual grains of the mineral magnetite found in the meteorite.