Thermoremanent magnetization ( TRM ) is acquired during cooling through the Curie temperature of the magnetic minerals and is the best source of information on the past Earth's field.
22.
Scientists at the Johnson Space Center in Houston say that a crystalized magnetic mineral, called magnetite, found in a Martian meteorite is similar to crystals formed on Earth by bacteria.
23.
The most significant new evidence is that the rock contains crystals of magnetite _ a magnetic mineral produced by many terrestrial bacteria _ that have a shape only found in magnetite produced by living organisms.
24.
This finding, though unexpected, was not entirely surprising because it was known that basalt the iron-rich, volcanic rock making up the ocean floor contains a strongly magnetic mineral ( magnetite ) and can locally distort compass readings.
25.
Magnetotactic bacterial cells have been used to determine south magnetic poles in meteorites and rocks containing fine-grained magnetic minerals and for the separation of cells after the introduction of magnetotactic bacterial cells into granulocytes and monocytes by phagocytosis.
26.
The sensitivity of magnetotactic bacteria to the Earth's magnetic field arises from the fact these bacteria precipitate chains of crystals of magnetic minerals within their cells; to date, all magnetotactic bacteria are reported to precipitate either magnetite or greigite.
27.
In their more refined analysis of magnetic minerals in the cave sediments, Pares and Dr . Alfredo Perez-Gonzalez found evidence of the last major reversal of Earth's magnetic field, the time it flip-flopped from pointing south to pointing toward geographic north.
28.
In a study appearing Tuesday in the Proceedings of the National Academy of Sciences, researchers at the Johnson Space Center in Houston say a crystalized magnetic mineral called magnetite, found in a Martian meteorite, is similar to crystals formed on Earth by bacteria.
29.
The non-magnetic product from the LIMS is sized at 150 micron on a dry Derrick screen before free-flowing to a multi-stage high gradient disc electromagnetic separator ( VOG HIMS ), with the goal of separating tungsten from non-magnetic minerals such as cassiterite and silicate.
30.
In 2000 she began designing fabric and wallpaper for Sahco Hesslein, becoming the first woman and the first American to design for the renowned German textile manufacturer . " Quarry, " made out of super-thin layers of actual rock; and " Magnetism, " a wallpaper coated in magnetic minerals.
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