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55名無しさん@おーぷん :2018/01/14(日)23:32:52 ID:???

Magnetite biomineralization in the human brain
.J L Kirschvink, A Kobayashi-Kirschvink, and B J Woodford

Abstract - Although the mineral magnetite (Fe3O4) is precipitated biochemically by bacteria, protists, and a variety of animals, it has not been documented previously in human tissue.

要旨 - 鉱物マグネタイト(Fe3O4)は、細菌、原生動物、および様々な動物によって生化学的に沈降するが、以前はヒトの組織には報告されていない。

Using an ultrasensitive superconducting magnetometer in a clean-lab environment, we have detected the presence of ferromagnetic material in a variety of tissues from the human brain.


Magnetic particle extracts from solubilized brain tissues examined with high-resolution transmission electron microscopy, electron diffraction,
and elemental analyses identify minerals in the magnetite-maghemite family, with many of the crystal morphologies and structures resembling strongly those precipitated by magnetotactic bacteria and fish.

高分解能透過電子顕微鏡、電子線回折、および元素分析を用いて可溶化された脳組織から得られた磁気粒子抽出物はマグネタイト - マグヘマイトファミリーのミネラルを同定し、

These magnetic and high-resolution transmission electron microscopy measurements imply the presence of a minimum of 5 million single-domain crystals per gram for most tissues in the brain and greater
than 100 million crystals per gram for pia and dura.


Magnetic property data indicate the crystals are in clumps of between 50 and 100 particles.


Biogenic magnetite in the human brain may account for high-field saturation effects observed in the T1 and T2 values of magnetic resonance imaging and,
perhaps, for a variety of biological effects of low-frequency magnetic fields.

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