Abstract:
:We suggest an experimental comparison of two directions for applying the time-varying magnetic fields which have been found to speed spontaneous regeneration of injured peripheral nerves and in attempts to repair spinal cord injuries. Time-varying magnetic fields induce currents in a plane perpendicular to the magnetic field direction. The lower conductivity of the spinal cord's sheath (dura matter) or of the myelin sheath of peripheral nerves would seem to confine the induced electric fields and currents to the spinal cord or nerve itself. The proposed comparison could allow choosing between two possible modes of action of the fields: (1) Magnetically-induced electric fields or currents may be encouraging ion flow or otherwise helping enzyme, channel or other interactions at the cell membrane, as is thought to be the case in field stimulation of healing in bone. This mechanism should be independent of field direction. (2) Work in developing organisms and with fields applied to nerve cells in vitro has shown that neurite growth is guided parallel to both endogenous and external electric fields. This mechanism would be effective when induced electric fields are parallel, but not when they are perpendicular to the nerve. Any experimental test should seek to produce as close as possible to the same induced current intensity with both field directions. Possible confounding factors, as well as breakdowns in the assumptions of the simple model presented here, would have to be considered. This proposal was motivated by a recent report in which the authors listed a changed field direction as one of several possible reasons for an unsuccessful experiment.
journal_name
Bioelectromagneticsjournal_title
Bioelectromagneticsauthors
Greenebaum B,Sisken BFdoi
10.1002/bem.20331subject
Has Abstractpub_date
2007-09-01 00:00:00pages
488-92issue
6eissn
0197-8462issn
1521-186Xjournal_volume
28pub_type
杂志文章abstract::In this study, we aimed to clarify the effects of chronically applied static magnetic field (200 Gauss) on specific ATPase activities and bioelectrical and biomechanical responses in isolated rat diaphragm muscle. The mean activities of Na(+)-K+ ATPase and Ca2+ ATPase determined from the diaphragm homogenates were sig...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.2250160302
更新日期:1995-01-01 00:00:00
abstract::An automated blood sampling system was developed for use with tethered baboons (Papio cynocephalus) during concurrent exposure to 60 Hz 30 kV/m electric fields and 0.1 mT (1.0 G) magnetic fields. The system was controlled by a FORTH-based microcomputer, which operated a pump, a fraction collector, and two pinch valves...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.2250160710
更新日期:1995-01-01 00:00:00
abstract::Magnetic fields (60 Hz) of 1.5 and 80 microT caused a significant reduction in the weight of Drosophila melanogaster. Moreover, fruit flies in an 80 microT field showed lower developmental stability than either those in a 0 or 1.5 microT field. Developmental instability was measured by fluctuating asymmetry and freque...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:
更新日期:2000-09-01 00:00:00
abstract::Possible effects of 1439 MHz electromagnetic near field (EMF) exposure on the blood-brain barrier (BBB) were investigated using immature (4 weeks old) and young (10 weeks old) rats, equivalent in age to the time when the BBB development is completed and the young adult, respectively. Alteration of BBB related genes, s...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20138
更新日期:2005-10-01 00:00:00
abstract::Adair [Bioelectromagnetics 14:1-4, 1993] writes that "the effects of 60 Hz magnetic fields of 5 microT (50 mG) or less on biological structures holding magnetite (Fe3O4) are shown to be much smaller than those from thermal agitation; hence such interactions cannot be expected to be biologically significant." This conc...
journal_title:Bioelectromagnetics
pub_type: 评论,杂志文章
doi:10.1002/bem.2250150308
更新日期:1994-01-01 00:00:00
abstract::This study examines childhood cancer risk in relation to certain factors likely to indicate magnetic field exposure from ground currents in the home. Substantial ground currents are most often found in homes having conductive plumbing, in which an uninterrupted metallic path in the water pipes and water main connects ...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.2250160204
更新日期:1995-01-01 00:00:00
abstract::Radiofrequency (5.28 MHz) electromagnetic radiation and low-temperature plasma were applied as short-term (2-15 min) seed treatments to two perennial woody plant species, including Smirnov's rhododendron (Rhododendron smirnowii Trautv.) and black mulberry (Morus nigra L.). Potential effects were evaluated using germin...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.22003
更新日期:2016-12-01 00:00:00
abstract::We have exposed cultured bone cells to a pulsed electromagnetic field (PEMF) for different times to find the minimal exposure time necessary to stimulate an increase of DNA synthesis. We used two different human osteosarcoma cell lines, TE-85 and MG-63, and human normal osteoblast cell (NHOC) obtained from surgical bo...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/(sici)1521-186x(1999)20:3<177::aid-bem4>3.
更新日期:1999-01-01 00:00:00
abstract::In an hypothesis-generating case-control study of amyotrophic lateral sclerosis, lifetime occupational histories were obtained. The patients (n = 28) were clinic based. The occupational exposure of interest in this report is electromagnetic fields (EMFs). This is the first and so far the only exposure analyzed in this...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/(sici)1521-186x(1997)18:1<28::aid-bem6>3.0
更新日期:1997-01-01 00:00:00
abstract::As a result of ischaemia/reperfusion, massive generation of reactive oxygen species occurs, followed by decreased activity of antioxidant enzymes. Extremely low frequency electromagnetic fields (ELF-EMF) can modulate oxidative stress, but there are no clinical antioxidant studies in brain stroke patients. The aim of o...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.22055
更新日期:2017-07-01 00:00:00
abstract::Digital cellular telephones using the GSM (Global System for Mobile Communication) transmit information in bursts of microwaves. This pulsed transmitting mode causes the battery current and currents in the electronics of the apparatus to be pulsed. These pulsed currents produce corresponding pulsed magnetic fields nea...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:
更新日期:1997-01-01 00:00:00
abstract::The potential ability of radiofrequency electromagnetic radiation (RFR) in the microwave range to induce mutagenesis, chromosomal aberrations, and sister chromatid exchanges in mammalian cells is being explored in our laboratories. In addition, we have also been examining the ability of simultaneous exposure to RFR an...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.2250110206
更新日期:1990-01-01 00:00:00
abstract::We investigated the thermal distribution and cardiovascular effects produced by sustained exposure of rats to 94 GHz radio-frequency electromagnetic radiation (RFR). Sixteen ketamine-anesthetized Sprague-Dawley rats were exposed individually at a power density of 75 mW/cm2 under far-field conditions in E orientation. ...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:
更新日期:1999-01-01 00:00:00
abstract::Radio-frequency electromagnetic radiation (RFR) at 915 and 147 MHz, when sinusoidally amplitude modulated (AM) at 16 Hz, has been shown to enhance release of calcium ions from neuroblastoma cells in culture. The dose-response relation is unusual, consisting of two power-density "windows" in which enhanced efflux occur...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.2250130407
更新日期:1992-01-01 00:00:00
abstract::We developed a new computer wire coding method and then applied it to investigate the suggestion that control selection bias might explain the observed association between wire codes and childhood cancer made in the study conducted by Savitz et al. in the Denver area. The computer wire coding method used a geographic ...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:
更新日期:2000-07-01 00:00:00
abstract::We have previously demonstrated that exposure of Chinese hamster lung (CHL) cells to 50 Hz magnetic fields (MFs) and/or 12-O-tetradecanoylphorbol-3-acetate (TPA)-inhibited gap junctional intercellular communication (GJIC). To explore and compare the mechanisms of GJIC inhibition induced by extremely low frequency (ELF...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.10070
更新日期:2003-02-01 00:00:00
abstract::Pregnant squirrel monkeys were exposed to 2450-MHz (CW) microwaves at an equivalent power density of 10 mW/cm2 (SAR 3.4 mW/g) for three hours daily in a cavity-cage module. The exposure began when pregnancy was determined by a hormonal method, and continued through of offspring's first 9.5 months. After irradiation, t...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.2250020305
更新日期:1981-01-01 00:00:00
abstract::Recent work has demonstrated that the reflection coefficient of human skin in the frequency range from 95 to 110 GHz (W band) mirrors the temporal relaxation of stress induced by physical exercise. In this work, we extend these findings to show that in the event of a subtle trigger to stress, such as mental activity, ...
journal_title:Bioelectromagnetics
pub_type: 临床试验,杂志文章
doi:10.1002/bem.21698
更新日期:2012-07-01 00:00:00
abstract::The MobilEe-study was the first cross-sectional population-based study to investigate possible health effects of mobile communication networks on children using personal dosimetry. Exposure was assessed every second resulting in 86,400 measurements over 24 h for each participant. Therefore, a functional approach to an...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20477
更新日期:2009-05-01 00:00:00
abstract::The constant exposure of modern society to extremely low frequency magnetic fields (ELF-MF) has raised considerable concerns about the potential risks to male reproduction. However, the epidemiological and experimental data remain contradictory and inconclusive. In the present study, we investigated the effects of 50 ...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.21816
更新日期:2014-01-01 00:00:00
abstract::This study was undertaken to investigate whether power frequency magnetic fields can affect the kinetics of cell cycle progression in exposed human cells. To achieve this, cultures of normal human fibroblasts were synchronised in the G(0) phase of the cell cycle and exposed to 50 Hz magnetic fields at a range of flux ...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:
更新日期:1999-10-01 00:00:00
abstract::Recent interest in the transient magnetic field events produced by electrical switching events in residential and occupational environments has been kindled by the possibility that these fields may explain observed associations between childhood cancer and wire codes. This paper reports the results of a study in which...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/(sici)1521-186x(200004)21:3<197::aid-bem7>
更新日期:2000-04-01 00:00:00
abstract::The objective was to study the risk of cytogenetic damage among high voltage laboratory workers exposed to electromagnetic fields and mineral oil. This is a cross sectional study of 24 exposed and 24 matched controls in a Norwegian transformer factory. The exposure group included employees in the high voltage laborato...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.33
更新日期:2001-04-01 00:00:00
abstract::In May 2011, the International Agency on Cancer in Research (IARC) issued an official statement concluding that cell phone usage was "possibly carcinogenic to humans." There have been considerable doubts that non-experts and experts alike fully understood what IARC's categorization actually meant, as "possibly carcino...
journal_title:Bioelectromagnetics
pub_type: 信件
doi:10.1002/bem.21851
更新日期:2014-07-01 00:00:00
abstract::We previously found that flowering of Arabidopsis was suppressed by near-null magnetic field, which was related to the modification of cryptochrome. To disclose the physiological mechanism of this effect, we detected gibberellin (GA) levels and expressions of GA biosynthetic and signaling genes in wild type Arabidopsi...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.22004
更新日期:2017-01-01 00:00:00
abstract::Through the use of the non-invasive vibrating probe technique for detecting extracellular ionic currents developed in 1974 [Jaffe and Nuccitelli: J Cell Biol 63:614-628, 1974], embryonic currents have been detected in a wide range of animal systems (recently reviewed in [Nuccitelli, Noninvasive Techniques in Cell Biol...
journal_title:Bioelectromagnetics
pub_type: 杂志文章,评审
doi:10.1002/bem.2250130714
更新日期:1992-01-01 00:00:00
abstract::This study examined whether 60 Hz magnetic field (MF) exposure alters intracellular calcium levels ([Ca(2+)](i)) in isolated bovine adrenal chromaffin cells, a classic model of neural responses. [Ca(2+)](i) was monitored by fluorescence video imaging of cells loaded with the calcium indicator fluo-4 during exposures t...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.10045
更新日期:2002-12-01 00:00:00
abstract::There are public concerns regarding possible carcinogenic or cancer-promoting effects of radiofrequency electromagnetic fields (RF-EMFs) because of the extensive use of wireless mobile phones and other telecommunication devices in daily life. However, so far it is unclear if non-thermal exposure of single EMF exposure...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20655
更新日期:2011-09-01 00:00:00
abstract::An experimental arrangement is described that maximized the dosimetric information that can be obtained during in vitro studies with ELF magnetic fields. The arrangement enables researchers to distinguish between a purely magnetic-field effect and one that also involves the electric fields and currents induced by the ...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.2250110306
更新日期:1990-01-01 00:00:00
abstract::Electric fields, which were equivalent to those generated by medical devices, were applied to cultured neuroblastoma cells (mouse and human) to test for morphological damage and to establish damage thresholds. Each of two methods of applying fields permitted flow of electrical current and minimized exposure of cells t...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.2250120505
更新日期:1991-01-01 00:00:00