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Researchers find magnetite nanoparticles similar to those from traffic pollution in brain; possible link with Alzheimer’s

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biogenic), most of the observed particles were spherical, with diameters up to 150 nm, some with fused surfaces, all characteristic of high-temperature formation—such as from vehicle (particularly diesel) engines or open fires. Unlike angular magnetite particles that are believed to form naturally within the brain (i.e., India study.

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