Sentences with word «magnetite»

And the presence of magnetite in birds» beaks had led some researchers to believe that this structure was key to birds» homing abilities.

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There are two main theoretical models, one based on small magnetite particles that may reorient in an external magnetic field and the other based on the idea that upon photo excitation a certain type of molecules in the eye of a bird support a radical pair formed by two electrons which evolve under the joint action of the Zeeman interaction with the external magnetic field and the hyperfine interaction with the supporting molecule.

The remarkable behaviour of platinum atoms on magnetite surfaces could lead to better catalysts.

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Microscopic views of individual magnetite crystals found in martian meteorite ALH 84001.

Sometimes several metal atoms on magnetite form small clusters.

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

The conclusion was that Martian microbes once used magnetite for the same purpose as terrestrial ones do.

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

Tarduno's new results are based on the record of magnetic field strength fixed within magnetite found within zircon crystals collected from the Jack Hills of Western Australia.

China - based Citic Group has flagged a $ US1.4 billion to $ US1.8 billion impairment at its Sino Iron magnetite project in the Pilbara as a result of the falling value of iron ore.

The Earth's magnetic field leaves its signature on volcanic rocks and certain sedimentary rocks rich in such iron - bearing minerals as magnetite.

It is generally agreed that Mars's colour is the result of a black form of iron called magnetite oxidising into the reddish - orange form called haematite.

They discerned a u-shaped chain of magnetite within a fluid - filled sac resembling a vacuole of a cell.

This micromagnetic model shows the three - dimensional vortex structure of magnetite nanocrystals.

Two additional colors are available for 2018, including Magnetite Gray Metallic and Crimson Red Pearl.

The directional information is stored in microscopic grains inside magnetite - a naturally occurring magnetic iron oxide.

Further south, concentrations of magnetite give the Empire Mine tailings pond its bluish appearance.

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

But in 2003 two papers noted that there are other ways to make magnetite crystals, such as slamming a rock from space onto the Martian surface.

In other species, including humans and homing pigeons, these cells have always been found to contain magnetite, a form of iron oxide.

But he concedes that scientists have not yet looked at enough biologically produced magnetites to completely rule out the possibility.

The problem, says Michael Nesson of Oregon State University in Corvallis and two colleagues at the California Institute of Technology in Pasadena, is that the cell cultures will all have been contaminated with magnetite, a magnetic form of iron oxide that is present in small quantities practically everywhere — in the air in household dust, even on the surface of laboratory glassware.

A joint venture between Viento Group and indigenous - owned Kimberley Pipelines has been awarded a $ 9.8 million pipeline construction works contract for the first stage of Fortescue Metals Group's North Star magnetite project in the Pilbara..

Fortescue Metals Group has signed a joint venture agreement with a subsidiary of China - based Shanghai Baosteel Group Corporation, to explore and potentially develop a one billion tonne magnetite deposit in the Pilbara.

But earlier this month, a team of scientists showed that the iron in birds» beaks isn't magnetite — it's balls of another, less magnetic, form of iron accumulated in white blood cells that are cleaning toxins out of the animals» bodies.

When magnetite particles are exposed to an EMF, they start to vibrate.

«It is only in a small part of naturally occurring magnetite that magnetic structures known for being very stable with respect to temperature fluctuations are found,» explains Dr. Trevor Almeida of Imperial College London.

Having shown that chemically modified magnetite (Fe2CrO4) meets the basic criteria required for an air stable, visible light photocatalyst, the investigators plan to carry out experiments in which they will transfer freshly grown Fe2CrO4 surfaces to a photoelectrochemical cell under a dry nitrogen atmosphere to avoid picking up surface carbon contamination.

PERTH - based Mineralogy Pty Ltd has entered into an agreement with Austeel Pty Ltd to provide access to 740 million tonnes of magnetite ore on attractive commercial terms.

Not only to you have to keep an eye on your Yen, though — there's also Magnetite, a type of substance that keeps demons alive.

Radar Iron is to become a major shareholder in a Northern Queensland magnetite project in a move it hopes will enable progression of its Western Australian projects.

The state budget assumes iron ore prices will average about $ US47.70 a tonne in the coming financial year, substantially higher that what most forecasters have been tipping, and also includes a $ 41 million royalty concession for magnetite producers.

As miners deal with the reality of a prolonged slump in the iron ore price, Fortescue Metals Group is quietly going about the business of building the state's third magnetite mine and processing plant.

Iron ore miner Gindalbie Metals has extended its finance facility for its Karara magnetite project in the Mid West by three years and an additional $ US400 million ($ 428 million).

Reminds me of your previous insightful analysis of Haematite vrs Magnetite iron ore projects - seems like a light year ago now, how things have changed!

Formosa fully funded the $ US340 million first stage of the project, which delivered a pilot plant capable of producing 1.5 million tonnes of magnetite concentrate in 2015.

«Windjana has more magnetite than previous samples we've analyzed,» said David Blake, principal investigator for Curiosity's Chemistry and Mineralogy (CheMin) instrument at NASA's Ames Research Center, Moffett Field, California.

«We do not believe it is too incautious to restate our original hypothesis that such magnetites constitute strong evidence of early life on Mars,» said lead author Kathie Thomas - Keprta at the time.

The fluid proposed by Ji - Ping Huang of Fudan University in Shanghai, China, and colleagues, contains tiny magnetite balls coated with a layer of silver, possibly with an additional polymer coating to keep them from clumping.

On other surfaces, pair formation would be favoured, but magnetite does not allow that,» says Roland Bliem.

At first glance, magnetite appears to be a rather inconspicuous grey mineral.

Other researchers, however warn that Nesson and his colleagues do not yet have any hard evidence showing that magnetite contamination produces the effects that they claim.

But researchers have until now failed to find enough magnetite in honeybees to explain their strong response to the Earth's magnetic field.

Debate on how birds sense geomagnetic fields has largely revolved around magnetite particles found in various parts of their heads.

The researchers used the new nano - scale technique of Transmission Kikuchi Diffraction to discover rims of the iron oxide mineral magnetite just a few ten thousandths of a millimetre thick around sulphide minerals inside the diamonds.

This crystal growth pattern, known as an axial screw dislocation, is rare in terrestrial magnetites and is totally unknown in those produced by living organisms, says McSween.

«I know of no biogenic mechanism for growing whiskers, and I don't know of any biogenic magnetite that contains screw dislocations,» agrees Peter Buseck, a geochemist at Arizona State University in Tempe.

FIG-mg18783801.GIF The screened sewage flows to a tank where it is mixed with powdered magnetite, along with aluminium sulphate to weaken the forces that stabilise the suspension of sewage particles.