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Biomagnetism

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https://www.readbyqxmd.com/read/29075623/new-frontiers-in-heart-rate-variability-and-social-coherence-research-techniques-technologies-and-implications-for-improving-group-dynamics-and-outcomes
#1
Rollin McCraty
Concepts embraced by the term coherence have been identified as central to fields such as quantum physics, physiology, and social science. There are different types of coherence, although the term always implies a harmonious relationship, correlations and connections between the various parts of a system. A specific measure derived from heart rate variability (HRV) provides a measure of physiological coherence. Another type of coherence, social coherence, relates to the harmonious alignment between couples or pairs, family units, small groups, or larger organizations in which a network of relationships exists among individuals who share common interests and objectives...
2017: Frontiers in Public Health
https://www.readbyqxmd.com/read/29067141/biomagnetic-pair-therapy-and-typhoid-fever-a-pilot-study
#2
Bryan L Frank
Objective: This pilot study examined the laboratory responses of patients with laboratory-documented typhoid fever who were treated with Biomagnetic Pair Therapy (BPT; medical biomagnetism), a specific application of pairs of magnets for various ailments that are infectious and otherwise. Materials and Methods: This study was an assessment of patients' response to treatment with only BPT for Salmonella typhi infections (typhoid fever) using standard conventional laboratory techniques. The research was conducted in an outpatient village clinic in Kenya...
October 1, 2017: Medical Acupuncture
https://www.readbyqxmd.com/read/29060889/single-trial-detection-of-event-related-fields-in-meg-from-the-presentation-of-happy-faces-results-of-the-biomag-2016-data-challenge
#3
H Cecotti, A Barachant, J R King, J Sanchez Bornot, G Prasad
The recognition of brain evoked responses at the single-trial level is a challenging task. Typical non-invasive brain-computer interfaces based on event-related brain responses use eletroencephalograhy. In this study, we consider brain signals recorded with magnetoencephalography (MEG), and we expect to take advantage of the high spatial and temporal resolution for the detection of targets in a series of images. This study was used for the data analysis competition held in the 20th International Conference on Biomagnetism (Biomag) 2016, wherein the goal was to provide a method for single-trial detection of even-related fields corresponding to the presentation of happy faces during the rapid presentation of images of faces with six different facial expressions (anger, disgust, fear, neutrality, sadness, and happiness)...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28820740/subspace-based-interference-removal-methods-for-a-multichannel-biomagnetic-sensor-array
#4
Kensuke Sekihara, Srikantan S Nagarajan
OBJECTIVE: In biomagnetic signal processing, the theory of the signal subspace has been applied to removing interfering magnetic fields, and a representative algorithm is the signal space projection algorithm, in which the signal/interference subspace is defined in the spatial domain as the span of signal/interference-source lead field vectors. This paper extends the notion of this conventional (spatial domain) signal subspace by introducing a new definition of signal subspace in the time domain...
October 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28715606/enzymatic-mechanisms-of-biological-magnetic-sensitivity
#5
Ulyana G Letuta, Vitaly L Berdinskiy, Chikako Udagawa, Yoshifumi Tanimoto
Primary biological magnetoreceptors in living organisms is one of the main research problems in magnetobiology. Intracellular enzymatic reactions accompanied by electron transfer have been shown to be receptors of magnetic fields, and spin-dependent ion-radical processes can be a universal mechanism of biological magnetosensitivity. Magnetic interactions in intermediate ion-radical pairs, such as Zeeman and hyperfine (HFI) interactions, in accordance with proposed strict quantum mechanical theory, can determine magnetic-field dependencies of reactions that produce biologically important molecules needed for cell growth...
July 17, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28660724/forced-and-self-rotation-of-magnetic-nanorods-assembly-at-the-cell-membrane-a-biomagnetic-torsion-pendulum
#6
François Mazuel, Samuel Mathieu, Riccardo Di Corato, Jean-Claude Bacri, Thierry Meylheuc, Teresa Pellegrino, Myriam Reffay, Claire Wilhelm
In order to provide insight into how anisotropic nano-objects interact with living cell membranes, and possibly self-assemble, magnetic nanorods with an average size of around 100 nm × 1 µm are designed by assembling iron oxide nanocubes within a polymeric matrix under a magnetic field. The nano-bio interface at the cell membrane under the influence of a rotating magnetic field is then explored. A complex structuration of the nanorods intertwined with the membranes is observed. Unexpectedly, after a magnetic rotating stimulation, the resulting macrorods are able to rotate freely for multiple rotations, revealing the creation of a biomagnetic torsion pendulum...
June 29, 2017: Small
https://www.readbyqxmd.com/read/28629096/synthesis-of-magnetic-nanoparticles-and-their-dispersions-with-special-reference-to-applications-in-biomedicine-and-biotechnology
#7
REVIEW
R V Mehta
Biomedical and biotechnological applications of magnetic nanoparticles and their dispersions in liquids are found to be potentially useful. An exponential growth in publications of papers, reviews and patents has been observed. Possibilities of their indiscriminate use on individual as well as environmental health hazards are also investigated. Still, there appears to be a good scope for further research work in the field. Even a small improvement either in preparation method or development of novel nanoparticles may prove to be beneficial in longer run...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28556421/gastrointestinal-disorders-after-immunosuppression-an-experimental-model-to-evaluate-the-influence-of-monotherapy-on-motility-parameters
#8
Denize Jussara Rupolo Dall'Agnol, Luciana Aparecida Corá, Maria do Carmo Borges Teixeira, Maysa Bruno de Lima, Loyane Almeida Gama, José Ricardo de Arruda Miranda, Madileine Francely Américo
What is the central question of this study? The aim was to propose an animal model for investigating the effects of immunosuppressive monotherapy on gastrointestinal motility using a non-invasive biomagnetic technique. What is main finding and its importance? In our experimental study, immunosuppressive drugs currently in use accelerated gastric emptying whilst increasing the frequency and amplitude of gastric contractions after treatment, except for Mycophenolate and azathioprine. Alternating current biosusceptometry is a useful tool to evaluate side-effects of drugs on the gastrointestinal tract, which will help in understanding the symptoms and improving clinical management of patients...
May 26, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28541679/biomagnetic-monitoring-of-atmospheric-pollution-a-review-of-magnetic-signatures-from-biological-sensors
#9
Jelle Hofman, Barbara A Maher, Adrian R Muxworthy, Karen Wuyts, Ana Castanheiro, Roeland Samson
Biomagnetic monitoring of atmospheric pollution is a growing application in the field of environmental magnetism. Particulate matter (PM) in atmospheric pollution contains readily measurable concentrations of magnetic minerals. Biological surfaces, exposed to atmospheric pollution, accumulate magnetic particles over time, providing a record of location-specific, time-integrated air quality information. This review summarizes current knowledge of biological material ("sensors") used for biomagnetic monitoring purposes...
June 9, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28426984/biomagnetic-monitoring-and-element-content-of-lichen-transplants-in-a-mixed-land-use-area-of-ne-italy
#10
Danijela Kodnik, Aldo Winkler, Fabio Candotto Carniel, Mauro Tretiach
The aim of this study was to verify whether it is possible to discriminate between the different pollution sources present in a mixed land use area of NE Italy on the basis of the magnetic properties and the element content of lichen transplants. Thalli of Pseudevernia furfuracea were collected in a pristine area of the South-Eastern Alps and exposed for 2months in 40 sites located at the knots of a 700m step grid covering ca. 40km(2) of a mosaic of agricultural, forested, industrial and urban areas. In this way, the samples could be analyzed after a defined period of time, and compared to pre-exposure conditions...
October 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/27941986/numerical-investigation-of-oxygenated-and-deoxygenated-blood-flow-through-a-tapered-stenosed-arteries-in-magnetic-field
#11
M Y Abdollahzadeh Jamalabadi, Amin Ali Akbari Bidokhti, Hamid Khak Rah, Siavash Vaezi, Payam Hooshmand
Current paper is focused on transient modeling of blood flow through a tapered stenosed arteries surrounded a by solenoid under the presence of heat transfer. The oxygenated and deoxygenated blood are considered here by the Newtonian and Non-Newtonian fluid (power law and Carreau-Yasuda) models. The governing equations of bio magnetic fluid flow for an incompressible, laminar, homogeneous, non-Newtonian are solved by finite volume method with SIMPLE algorithm for structured grid. Both magnetization and electric current source terms are well thought-out in momentum and energy equations...
2016: PloS One
https://www.readbyqxmd.com/read/27897245/engineering-genetically-encoded-mineralization-and-magnetism-via-directed-evolution
#12
Xueliang Liu, Paola A Lopez, Tobias W Giessen, Michael Giles, Jeffrey C Way, Pamela A Silver
Genetically encoding the synthesis of functional nanomaterials such as magnetic nanoparticles enables sensitive and non-invasive biological sensing and control. Via directed evolution of the natural iron-sequestering ferritin protein, we discovered key mutations that lead to significantly enhanced cellular magnetism, resulting in increased physical attraction of ferritin-expressing cells to magnets and increased contrast for cellular magnetic resonance imaging (MRI). The magnetic mutants further demonstrate increased iron biomineralization measured by a novel fluorescent genetic sensor for intracellular free iron...
November 29, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27889653/remote-detected-low-field-mri-using-an-optically-pumped-atomic-magnetometer-combined-with-a-liquid-cooled-pre-polarization-coil
#13
Ingo Hilschenz, Yosuke Ito, Hiroaki Natsukawa, Takenori Oida, Tetsuya Yamamoto, Tetsuo Kobayashi
Superconducting quantum interference devices are widely used in basic and clinical biomagnetic measurements such as low-field magnetic resonance imaging and magnetoencephalography primarily because they exhibit high sensitivity at low frequencies and have a wide bandwidth. The main disadvantage of these devices is that they require cryogenic coolants, which are rather expensive and not easily available. Meanwhile, with the advances in laser technology in the past few years, optically pumped atomic magnetometers (OPAMs) have been shown to be a good alternative as they can have adequate noise levels and are several millimeters in size, which makes them significantly easier to use...
January 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/27825890/magnetic-impedance-biosensor-a-review
#14
REVIEW
Tao Wang, Yong Zhou, Chong Lei, Jun Luo, Shaorong Xie, Huayan Pu
Though the magnetoimpedance effect was discovered two decades ago, the biomedical applications of the magnetoimpedance sensor are still in their infancy. In this review, the authors summarized the magnetoimpedance effect in soft ferromagnetic wires, ribbons and thin films for biosensing applications. Recent progress and achievements of the magnetoimpedance-based biosensing applications including the detection of magnetic Ferrofluid, magnetic beads, magnetic nanoparticles, magnetically labeled bioanalytes and biomagnetic fields of living systems were reviewed...
April 15, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27768972/micellar-nanocomplexes-for-biomagnetic-delivery-of-intracellular-proteins-to-dictate-axon-formation-during-neuronal-development
#15
Giulia Suarato, Seong-Il Lee, Weiyi Li, Sneha Rao, Tanvir Khan, Yizhi Meng, Maya Shelly
During mammalian embryonic development, neurons polarize to create distinct cellular compartments of axon and dendrite that inherently differ in form and function, providing the foundation for directional signaling in the nervous system. Polarization results from spatio-temporal segregation of specific proteins' activities to discrete regions of the neuron to dictate axonal vs. dendritic fate. We aim to manipulate axon formation by directed subcellular localization of crucial intracellular protein function...
January 2017: Biomaterials
https://www.readbyqxmd.com/read/27754358/a-high-sensitivity-tunable-two-beam-fiber-coupled-high-density-magnetometer-with-laser-heating
#16
Igor Savukov, Malcolm G Boshier
Atomic magnetometers (AM) are finding many applications in biomagnetism, national security, industry, and science. Fiber-coupled (FC) designs promise to make them compact and flexible for operation. Most FC designs are based on a single-beam configuration or electrical heating. Here, we demonstrate a two-beam FC AM with laser heating that has 5 fT/Hz(1/2) sensitivity at low frequency (50 Hz), which is higher than that of other fiber-coupled magnetometers and can be improved to the sub-femtotesla level. This magnetometer is widely tunable from DC to very high frequencies (as high as 100 MHz; the only issue might be the application of a suitable uniform and stable bias field) with a sensitivity under 10 fT/Hz(1/2) and can be used for magneto-encephalography (MEG), magneto-cardiography (MCG), underground communication, ultra-low MRI/NMR, NQR detection, and other applications...
October 13, 2016: Sensors
https://www.readbyqxmd.com/read/27539165/the-natural-history-of-fetal-long-qt-syndrome
#17
Bettina F Cuneo, Janette F Strasburger, Ronald T Wakai
INTRODUCTION: Fetal magnetocardiography (fMCG), the magnetic analog of ECG, has provided invaluable insight into the mechanisms of fetal arrhythmias. In the past 15years, we have evaluated over 300 fetuses with arrhythmia by fMCG. We review the unique characteristics and natural history of the long QT syndrome (LQTS) rhythms. METHODS: We reviewed the fMCGs of subjects referred with suspected LQTS based on either a positive family history or echo diagnosis of the LQTS rhythms (sinus bradycardia, ventricular tachycardia, or 2:1 AV conduction) to the Biomagnetism laboratory in the Department of Medical Physics, UW-Madison...
November 2016: Journal of Electrocardiology
https://www.readbyqxmd.com/read/27509836/mri-based-quantitative-susceptibility-mapping-qsm-and-r2-mapping-of-liver-iron-overload-comparison-with-squid-based-biomagnetic-liver-susceptometry
#18
Samir D Sharma, Roland Fischer, Bjoern P Schoennagel, Peter Nielsen, Hendrik Kooijman, Jin Yamamura, Gerhard Adam, Peter Bannas, Diego Hernando, Scott B Reeder
PURPOSE: We aimed to determine the agreement between quantitative susceptibility mapping (QSM)-based biomagnetic liver susceptometry (BLS) and confounder-corrected R2* mapping with superconducting quantum interference device (SQUID)-based biomagnetic liver susceptometry in patients with liver iron overload. METHODS: Data were acquired from two healthy controls and 22 patients undergoing MRI and SQUID-BLS as part of routine monitoring for iron overload. Magnetic resonance imaging was performed on a 3T system using a three-dimensional multi-echo gradient-echo acquisition...
July 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27465206/a-room-temperature-ultrasensitive-magnetoelectric-susceptometer-for-quantitative-tissue-iron-detection
#19
Hao Xi, Xiaoshi Qian, Meng-Chien Lu, Lei Mei, Sebastian Rupprecht, Qing X Yang, Q M Zhang
Iron is a trace mineral that plays a vital role in the human body. However, absorbing and accumulating excessive iron in body organs (iron overload) can damage or even destroy an organ. Even after many decades of research, progress on the development of noninvasive and low-cost tissue iron detection methods is very limited. Here we report a recent advance in a room-temperature ultrasensitive biomagnetic susceptometer for quantitative tissue iron detection. The biomagnetic susceptometer exploits recent advances in the magnetoelectric (ME) composite sensors that exhibit an ultrahigh AC magnetic sensitivity under the presence of a strong DC magnetic field...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27416588/selection-of-reference-channels-based-on-mutual-information-for-frequency-dependent-subtraction-method-applied-to-fetal-biomagnetic-signals
#20
D Escalona-Vargas, E R Siegel, P Murphy, C L Lowery, H Eswaran
OBJECTIVE: We propose a method that uses minimal redundancy and maximal relevance (mRMR) based on mutual information as criteria to automatically select references for the frequency-dependent subtraction (SUBTR) method to attenuate maternal (mMCG) and fetal (fMCG) magnetocardiograms of fetal magnetoencephalography recordings. METHODS: mRMR is calculated between all channels and mMCG/fMCG target channels and the most promising sensors are used as references to perform SUBTR...
May 2017: IEEE Transactions on Bio-medical Engineering
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