magnetite in human tissues a mechanism for the biological

magnetite in human tissues a mechanism for the biological

Magnetite in human tissues: A mechanism for the biological ...

Magnetite in human tissues: A mechanism for the biological effects of weak ELF magnetic fields

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Magnetite in human tissues: A mechanism for the biological ...

Jan 01, 1992  Due to the apparent lack of a biophysical mechanism, the question of whether weak, low-frequency magnetic fields are able to influence living organisms has long been one of the most controversial subjects in any field of science. However, two

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Magnetite in human tissues: A mechanism for the biological ...

BibTeX @ARTICLE{Kirschvink92magnetitein, author = {Joseph L. Kirschvink and Atsuko Kobayashi-kirschvink and Juan C. Diaz and Steven J. Kirschvink}, title = {Magnetite in human tissues: A mechanism for the biological effects of weak ELF magnetic fields}, journal =

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Identification and significance of magnetite in human tissues.

Jul 01, 1986  Magnetite in human tissues: a mechanism for the biological effects of weak ELF magnetic fields. Kirschvink JL, Kobayashi-Kirschvink A, Diaz-Ricci JC, Kirschvink SJ. Bioelectromagnetics, Suppl 1:101-113, 01 Jan 1992 Cited by: 35 articles PMID: 1285705. Review

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Magnetite in the Human Brain - THE SEDONA EFFECT:

Abstract = The presence of trace amounts of biogenic magnetite (Fe3O4) in animal and human tissues and the observation that ferromagnetic particles are ubiquitous in laboratory materials (including tissue culture media) provide a physical mechanism through which microwave radiation might produce or appear to produce biological effects.

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Magnetite in the human body: Biogenic vs. anthropogenic

Oct 25, 2016  Magnetite is an iron-oxide mineral that occurs naturally on Earth. Because it is also an important component of many anthropogenic materials (e.g., coal fly ash) and synthetic products (e.g., black toner powders), magnetite can be released to the environment through human activities (1). In PNAS, Maher et al. (2) describe the abundant presence in the human brain of magnetite

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Magnetite in the human body: Biogenic vs. anthropogenic PNAS

Oct 25, 2016  Biogenic, chemically pure magnetite crystals occur in the bodies of a wide range of organisms within the kingdoms of the Monera, Protista, and Animalia (e.g., magnetotactic microbes, insects, molluscs, fish, birds, mammals) ().In these organisms, magnetite forms the basis for one type of biophysical mechanism of magnetic field detection, which facilitates orientation and navigation (5, 6).

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Interactions of Electromagnetic Waves with Biological Tissue

– Most of the cells and tissues that will be studied are non-magnetic – For these types of materials, is considered to be equivalent to 0, the permeability of free space – It is, therefore, much less critical to our analysis of EM interaction with biological tissue than permittivity and conductivity

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Dielectric Properties of Biological Materials

changing following relatively recent reports of the presence of magnetite in human nervous tissue (see, e.g., Dobson and Grassi, 1996), which suggest that magnetite may provide a mechanism for direct interaction of external magnetic fields with the human central nervous system. The role of these strongly magnetic materials in organisms is

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How Magnetic Fields May Affect Biological Tissue MIT ...

Apr 09, 2009  How do magnetic fields affect biological tissue? An entire field of science called bioelectromagnetics has grown up to study this problem and yet

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BIOLOGICAL EFFECTS OF MAGNETIC FIELDS

magnetic permeability, depends on the medium and in the case of biological tissues is assumed to be equal to the value of the permeability of free space 0 = 4 x 10-7 (T•m/A-1). The magnetic flux density B may be defined in terms of the Lorentz force F acting on a charge q that moves in a magnetic field with a velocity v [1]: F q v B ( ) (1)

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A ferromagnetic model for the action of electric and ...

Apr 01, 2014  In our work on human tissues , we reported the presence of ∼4 ng/g of magnetite in the cortex and cerebellum (with a factor of 10× larger in the meninges), values similar to that measured with superconducting magnetometry in a variety of other animal tissues . With these measured Vertebrate cell concentrations, this yields minimum estimates ...

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Magnetic Crystals, Guides for Animals, Found in Humans ...

May 12, 1992  Magnetite interacts over a million times more strongly with external magnetic fields than any other biological material, Dr. Kirschvink said, including the iron in red blood cells.

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Magnetite - Wikipedia

Magnetite is a mineral and one of the main iron ores, with the chemical formula Fe 3 O 4.It is one of the oxides of iron, and is ferrimagnetic; it is attracted to a magnet and can be magnetized to become a permanent magnet itself. It is the most magnetic of all the naturally occurring minerals on Earth. Naturally magnetized pieces of magnetite, called lodestone, will attract small pieces of ...

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REVIEWS OF TOPICAL PROBLEMS: Effects of weak magnetic ...

Magnetite in human tissues: a mechanism for the biological effects of weak ELF magnetic fields. J. Kirschvink , A. Kobayashi-Kirschvink , J. Díaz-Ricci , S. Kirschvink Biology, Medicine

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Does anyone know the magnetic permeability of biological ...

Dec 08, 2001  The relative permeability of human tissues is very close to that of free-space. Deviations from unity are very small so any scattering due to magnetic properties of tissues will be small too.

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Effects of Electromagnetic Fields on Organs and Tissues ...

The effects of radiation on nervous tissues have been a subject of active investigation since changes in animal behavior and nerve electrical properties were first reported in the Soviet Union during the 1950s and 1960s. 1 RF radiation is reported to affect isolated nerve preparations, the central nervous system, brain chemistry and histology, and the blood-brain barrier.

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Microwave absorption by magnetite: a possible mechanism ...

Jan 01, 1996  The presence of trace amounts of biogenic magnetite (Fe3O4) in animal and human tissues and the observation that ferromagnetic particles are ubiquitous in laboratory materials (including tissue culture media) provide a physical mechanism through which microwave radiation might produce or appear to produce biological effects. Magnetite is an ...

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Microwave absorption by magnetite: A possible mechanism ...

The presence of trace amounts of biogenic magnetite (Fe 3 O 4) in animal and human tissues and the observation that ferromagnetic particles are ubiquitous in laboratory materials (including tissue culture media) provide a physical mechanism through which microwave radiation might produce or appear to produce biological effects.Magnetite is an excellent absorber of microwave radiation at ...

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Interaction mechanisms and biological effects of static ...

Jun 01, 1994  @article{osti_10109531, title = {Interaction mechanisms and biological effects of static magnetic fields}, author = {Tenforde, T S}, abstractNote = {Mechanisms through which static magnetic fields interact with living systems are described and illustrated by selected experimental observations. These mechanisms include electrodynamic interactions with moving, ionic charges (blood flow and

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Mechanisms of tissue-iron relaxivity: nuclear magnetic ...

Nonexponential relaxation was evident at short refocusing intervals with R2 and amplitude behavior suggestive of magnetic susceptibility-based compartmentalization rather than anatomic subdivisions. NMR relaxometry of human liver biopsy specimens yields unique insights into the mechanisms of tissue-iron relaxivity.

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Questions and Answers about Biological Effects and ...

This process can produce molecular changes that can lead to damage in biological tissue, including effects on DNA, the genetic material. This process requires interaction with ... since the mechanisms of interaction with the human body are quite different. ... source. In the far field, the electric and magnetic fields are related to each other ...

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Microwave absorption by magnetite: A possible mechanism ...

The presence of trace amounts of biogenic magnetite (Fe 3 O 4) in animal and human tissues and the observation that ferromagnetic particles are ubiquitous in laboratory materials (including tissue culture media) provide a physical mechanism through which microwave radiation might produce or appear to produce biological effects.Magnetite is an excellent absorber of microwave radiation at ...

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A review of normal tissue hydrogen NMR relaxation times ...

The longitudinal (T1) and transverse (T2) hydrogen (1H) nuclear magnetic resonance (NMR) relaxation times of normal human and animal tissue in the frequency range 1-100 MHz are compiled and reviewed as a function of tissue type, NMR frequency, temperature, species, in vivo versus in vitro status, time after excision, and age.

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Interaction Mechanisms - GreenFacts

Stochastic resonance mechanism Biogenic magnetite mechanism. Induced currents mechanism. A basic physical interaction mechanism of ELF magnetic fields and living organisms. It is well-established that external ELF magnetic fields induce electric fields and currents in biological tissues.

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Dielectric Properties of Biological Materials

changing following relatively recent reports of the presence of magnetite in human nervous tissue (see, e.g., Dobson and Grassi, 1996), which suggest that magnetite may provide a mechanism for direct interaction of external magnetic fields with the human central nervous system. The role of these strongly magnetic materials in organisms is

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New evidence for a human magnetic sense that lets your ...

Mar 18, 2019  New evidence for a human magnetic sense that lets your brain detect the Earth’s magnetic field ... including within tissues of the human brain. ... reflecting a biological mechanism

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Physical Mechanisms for Biological Effects of Low Field ...

Jul 22, 2007  Introduction. Biological effects of high intensity ELF electric fields, such as muscle stimulation and - at still higher intensities - cell damage by electroporation and heating, are reasonably well (although not completely) understood.

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Biological effects of exposure to magnetic resonance ...

Apr 22, 2004  The literature on biological effects of magnetic and electromagnetic fields commonly utilized in magnetic resonance imaging systems is surveyed here. After an introduction on the basic principles of magnetic resonance imaging and the electric and magnetic properties of biological tissues, the basic phenomena to understand the bio-effects are described in classical terms.

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Diffusion Magnetic Resonance Imaging: What Water Tells Us ...

Jul 23, 2015  In biological tissues, the molecular displacement distribution deviates from a Gaussian law, and, thus, the diffusion effect on the MRI signal is no longer adequately described by Einstein’s equation . Consequently, the diffusion coefficient derived from diffusion-weighted images is no longer the free diffusion coefficient of water.

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Biological Effects of Magnetic Resonance Imaging ...

Jan 10, 2016  Magnetic Resonance Imaging Energy Fields. Although MRI is considered safe, radiobiologists will be busy for many years working to stretch their ability to detect human responses to the energy fields used. It is certain that the delayed determination that x-ray exposure can cause cancer and leukemia will not be repeated with MRI, because the energy fields are nonionizing.

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Magnetite pollution nanoparticles in the human brain PNAS

Sep 27, 2016  Abstract. Biologically formed nanoparticles of the strongly magnetic mineral, magnetite, were first detected in the human brain over 20 y ago [Kirschvink JL, Kobayashi-Kirschvink A, Woodford BJ (1992) Proc Natl Acad Sci USA 89(16):7683–7687]. Magnetite can have potentially large impacts on the brain due to its unique combination of redox activity, surface charge, and strongly magnetic

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Oxidative mechanisms of biological activity of low ...

RFR in human germ cells have been published (Agarwal et al., 2009; De Iuliis et al., 2009). All abovementioned studies dealt with the effects of low-intensity RFR. This means that the intensity of radiation was far below observable thermal effects in biological tissues, and far below safety limits of the International Commissions on

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Biological effects of RF/ MW radiations on human

Thermal mechanisms arise from the deposition of power in the biological systems. The duration of exposure can influence the rate of cooling of the tissue by blood flow, and other factors. The local heating effects in tissue can become significant or even damaging. These include a variety

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