Would the Human Brain Be Able to Erect Specific Effects Due to the Magnetic Field Component of an Uhf Field via Magnetite Nanoparticles?

Abstract

Abstract-In 2016 a study reported observing a concentration of magnetite nanocrystals in human brains, with four orders of magnitude larger than previously thought. In the context of magnetite's role and function inside the human brain not being properly understood, this development prompts a question concerning the impact that a significant magnetic near-field component, in the hundreds of MHz range, might have on power loss in tissues having ferrimagnetic properties. This article highlights the importance of thorough research on possible thermal and non-thermal effects that could be caused by the magnetic field component to which one could be exposed while using certain communication devices near or in front of the head. Furthermore, this article provides preliminary estimations of magnetic contribution to the specific absorption rate (SAR) of energy deposition in tissues, using two approaches -one based on existing research concerning magnetic hyperthermia, and the other one based on a simulation model that takes into account the magnetic properties of tissues. By simulating the propagation of a 440 MHz wave in a "magnetic" (as opposed to pure dielectric) brain, we observed changes of the SAR values, and, more importantly, superficial hot spots appeared at the surface of small magnetite particles, distributed in the homogenous brain.

Modulation of Calcium Signaling and Metabolic Pathways in Endothelial Cells with Magnetic Fields

“…BMNs in animals and human are chemically pure magnetite or maghemite and was found to be organized into magnetically interacting clusters and linear membrane-bound chains [38,[67][68][69] as well as BMNs in magnetotactic bacteria. For example, human brain contains the intracellular magnetite crystals forming chains and are bound to the cell membrane, and have a saturation magnetization Ms = 4.5×10 5 A/m [70]; there are up to 80 magnetite crystals in a chain in the human brain according to [71]. The chains of BMN are found experimentally in capillary walls that are formed by a single layer of endothelial cells [38].…”

Magnetite Particle Presence in the Human Brain: A Computational Dosimetric Study to Emphasize the Need of a Complete Assessment of the Electromagnetic Power Deposition at 3.5 GHz

“…The Larmor precession of the spin creates a resonant frequency in the magnetic material property, defined by ferromagnetic resonance. Equation (2) shows that torques are due to the magnetic field acting on magnetic moments. So the LLG equation requires knowledge of the magnetic field, which can be obtained by solving the Maxwell equations.…”

“…Magnetic nanoparticles in human tissues, and more specifically in the brain, have been scarcely investigated for their electromagnetic wave absorption at Ultra-High Frequencies (UHF) [1,2]. The presence of biogenic magnetite (Fe 3 O 4 ) nanocrystals in the human brain was discovered in 1992, while the concentration of 0.2-12µg magnetite in each 1g of dry cerebral tissue was identified in 2009 [3].…”

Simulation Research on Magnetoacoustic Concentration Tomography With Magnetic Induction Based on Uniaxial Anisotropy of Magnetic Nanoparticles

“…However, due to contributions such as magnetocrystalline, shape, and surface, MNPs exhibited anisotropy, and the anisotropy displayed a first order-dominant uniaxial characteristic [21]. The magnetization of MNPs was affected by many factors [22][23][24][25][26], among which the uniaxial anisotropy of MNPs directly led to the change of the static magnetization curve [27]. In the numerical calculation, magnetic force, acoustic source, and acoustic pressure were all solved based on the static magnetization curve.…”