Long-term memory in brain magnetite

Banaclocha, Marcos Arturo Martínez; Bókkon, István; Banaclocha, Helios Martínez

doi:10.1016/j.mehy.2009.09.024

Cited by 34 publications

(4 citation statements)

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“…Considering that magnetite in the human brain was found mostly on the brain surface and regions associated with memory, it has been proposed that magnetite plays a key role in perception, transduction and storage of information at the neocortical level. 89…”

Section: Magnetite Biomineralizationmentioning

confidence: 99%

Bioinspired synthesis of magnetite nanoparticles

2016

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Magnetite (Fe3O4) is a widespread magnetic iron oxide encountered in many biological and geological systems, and also in many technological applications. The magnetic properties of magnetite crystals depend strongly on the size and shape of its crystals. Hence, engineering magnetite nanoparticles with specific shapes and sizes allows tuning their properties to specific applications in a wide variety of fields, including catalysis, magnetic storage, targeted drug delivery, cancer diagnostics and magnetic resonance imaging (MRI). However, synthesis of magnetite with a specific size, shape and a narrow crystal size distribution is notoriously difficult without using high temperatures and non-aqueous media. Nevertheless, living organisms such as chitons and magnetotactic bacteria are able to form magnetite crystals with well controlled sizes and shapes under ambient conditions and in aqueous media. In these biomineralization processes the organisms use a twofold strategy to control magnetite formation: the mineral is formed from a poorly crystalline precursor phase, and nucleation and growth are controlled through the interaction of the mineral with biomolecular templates and additives. Taking inspiration from this biological strategy is a promising route to achieve control over the kinetics of magnetite crystallization under ambient conditions and in aqueous media. In this review we first summarize the main characteristics of magnetite and what is known about the mechanisms of magnetite biomineralization. We then describe the most common routes to synthesize magnetite and subsequently will introduce recent efforts in bioinspired magnetite synthesis. We describe how the use of poorly ordered, more soluble precursors such as ferrihydrite (FeH) or white rust (Fe(OH)2) can be employed to control the solution supersaturation, setting the conditions for continued growth. Further, we show how the use of various organic additives such as proteins, peptides and polymers allows for either the promotion or inhibition of magnetite nucleation and growth processes. At last we discuss how the formation of magnetite-based organic-inorganic hybrids leads to new functional nanomaterials.

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Section: Magnetite Biomineralizationmentioning

confidence: 99%

Bioinspired synthesis of magnetite nanoparticles

2016

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“…Some authors have hypothesized that the magnetic fields that are generated by neural activity could be used to store information [ 128 , 129 , 130 , 131 ], such as memory and variables that are related to cognition. For such a system to function properly, it would likely require some intrinsic mechanisms to negate outside influences that are variable (i.e., electromagnetic fields) or accommodate those that are somewhat static (i.e., the GMF of the Earth and local conditions).…”

Section: Additional Risks Of Space Flight Into Deep Space and Living ...mentioning

confidence: 99%

Homo sapiens—A Species Not Designed for Space Flight: Health Risks in Low Earth Orbit and Beyond, Including Potential Risks When Traveling beyond the Geomagnetic Field of Earth

Hart

2023

Life

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Homo sapiens and their predecessors evolved in the context of the boundary conditions of Earth, including a 1 g gravity and a geomagnetic field (GMF). These variables, plus others, led to complex organisms that evolved under a defined set of conditions and define how humans will respond to space flight, a circumstance that could not have been anticipated by evolution. Over the past ~60 years, space flight and living in low Earth orbit (LEO) have revealed that astronauts are impacted to varying degrees by such new environments. In addition, it has been noted that astronauts are quite heterogeneous in their response patterns, indicating that such variation is either silent if one remained on Earth, or the heterogeneity unknowingly contributes to disease development during aging or in response to insults. With the planned mission to deep space, humans will now be exposed to further risks from radiation when traveling beyond the influence of the GMF, as well as other potential risks that are associated with the actual loss of the GMF on the astronauts, their microbiomes, and growing food sources. Experimental studies with model systems have revealed that hypogravity conditions can influence a variety biological and physiological systems, and thus the loss of the GMF may have unanticipated consequences to astronauts’ systems, such as those that are electrical in nature (i.e., the cardiovascular system and central neural systems). As astronauts have been shown to be heterogeneous in their responses to LEO, they may require personalized countermeasures, while others may not be good candidates for deep-space missions if effective countermeasures cannot be developed for long-duration missions. This review will discuss several of the physiological and neural systems that are affected and how the emerging variables may influence astronaut health and functioning.

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“…Aucune publication ne laisse présager que cette magnétite puisse servir à la magnétoréception. En revanche, il a été proposé qu'elle puisse intervenir dans la mémoire à long terme (Banaclocha, Bókkon, and Banaclocha 2010). Il faut souligner que la magnétite est associée aux plaques séniles caractéristiques de la maladie d'Alzheimer (Dobson 2004).…”

Section: Les Cryptochromesunclassified

Comments on Martin Pall, “Millimeter (MM) wave and microwave frequency radiation produce deeply penetrating effects: the biology and the physics”, Rev Environ Health 2021;37:247–58.

Foster

Balzano

2021

Reviews on Environmental Health

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Avis de l'Anses Saisine n° « 2011-SA-0150 » En complément des documents ainsi recensés, des contributions écrites ont été sollicitées auprès de médecins et sociologues, sur des aspects précis concernant l'expertise. De plus, des études ont fait l'objet de contrats de recherche et développement (CRD) avec le Centre scientifique et technique du bâtiment (CSTB) et l'unité mixte de recherche épidémiologique et de surveillance transport-travail-environnement (UMRESTTE, Ifsttar et Université Claude Bernard Lyon 1), afin d'obtenir de nouvelles données.En outre, compte tenu de la complexité du sujet, des limites méthodologiques de nombreux articles scientifiques, de l'absence d'études portant sur certaines questions, ainsi que des controverses qui résultent parfois de ces difficultés, le groupe de travail s'est également intéressé aux expériences de terrain. Il s'est ainsi penché, à travers une vingtaine d'auditions, sur les témoignages de différentes parties prenantes (médecins hospitaliers et médecins généralistes, associations et collectifs de citoyens, élus, chercheurs, etc.). Ces témoignages ont nourri les réflexions du groupe de travail et parfois proposé des hypothèses explicatives de l'EHS, qui ont ensuite été analysées au cours de l'expertise. Déroulement de l'expertiseEntre juillet 2014 et octobre 2017, le groupe de travail s'est réuni 29 fois en séances plénières afin, notamment, de procéder aux auditions, à l'analyse des articles et d'étudier et débattre de la plausibilité des différentes hypothèses avancées pour expliquer l'origine des troubles.La qualité des publications scientifiques (études cliniques et études épidémiologiques principalement) a été évaluée en s'appuyant sur différents critères (rigueur du protocole, caractérisation des expositions, etc.), quels que soient leurs résultats et conclusions.Les travaux d'expertise ont été présentés au CES à plusieurs reprises entre septembre 2014 et novembre 2017, tant sur les aspects méthodologiques que scientifiques. Les commentaires du CES ont été pris en compte par le groupe de travail tout au long de l'expertise.Celle-ci a été réalisée dans le respect de la norme NF X 50-110 « Qualité en expertise -Prescriptions générales de compétence pour une expertise (Mai 2003) ». Consultation publiqueConsidérant l'importance, la complexité et la sensibilité du sujet, l'Agence a souhaité porter le rapport « Hypersensibilité électromagnétique ou intolérance environnementale idiopathique attribuée aux champs électromagnétiques » dans un état pré-définitif, c'est-à-dire sans conclusion ni recommandation, à la connaissance des membres de la communauté scientifique et des parties prenantes intéressées au cours d'une consultation publique.Celle-ci a été ouverte du 27 juillet au 15 octobre 2016. Elle était destinée à recueillir des données et commentaires scientifiques susceptibles d'être pris en compte dans l'élaboration finale du rapport d'expertise. Au total, plus de 500 commentaires ont été déposés par l'intermédiaire d'un formulaire en ligne disponible sur le site inter...

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Long-term memory in brain magnetite

Cited by 34 publications

References 34 publications

Bioinspired synthesis of magnetite nanoparticles

Bioinspired synthesis of magnetite nanoparticles

Homo sapiens—A Species Not Designed for Space Flight: Health Risks in Low Earth Orbit and Beyond, Including Potential Risks When Traveling beyond the Geomagnetic Field of Earth

Comments on Martin Pall, “Millimeter (MM) wave and microwave frequency radiation produce deeply penetrating effects: the biology and the physics”, Rev Environ Health 2021;37:247–58.

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