Abstract:
:The effect of 1 Hz, 30 mT pulsed magnetic fields on young adult rat femoral metaphyseal bone thickness was assessed. Ten same litter, female Wistar rats were studied; five of them underwent 30 min magnetic stimulation sessions for 20 consecutive days. The anterior and posterior cortical, as well as trabecular bone transverse thicknesses were measured. The results obtained under clear field microscopy in stimulated and control histological cuts were (in microm) 398 +/- 32 versus 260 +/- 22 (P = 0.002), 380 +/- 68 versus 252 +/- 21 (P = 0.03), and 168 +/- 11 versus 112 +/- 11 (P = 0.002), respectively. The transcranial magnetic stimulation system, approved for human therapy, generates pulsed electromagnetic fields, which induce a significant thickness increase in cortical and trabecular in vivo stimulated bone tissues. This is the first time this effect in healthy animals is shown.
journal_name
Bioelectromagneticsjournal_title
Bioelectromagneticsauthors
Márquez-Gamiño S,Sotelo F,Sosa M,Caudillo C,Holguín G,Ramos M,Mesa F,Bernal J,Córdova Tdoi
10.1002/bem.20396subject
Has Abstractpub_date
2008-07-01 00:00:00pages
406-9issue
5eissn
0197-8462issn
1521-186Xjournal_volume
29pub_type
杂志文章abstract::Conductive nanoparticles may enhance tissue heating during radiofrequency (RF) irradiation. Specific absorption rate (SAR) is known to rise with the electrical conductivity of tissue. However, no studies to date have measured the relationship between complex permittivity and nanoparticle concentration in tissue-like s...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20595
更新日期:2010-12-01 00:00:00
abstract::The fundamental intramolecular frequency of a globular protein can be obtained from the measurements of acoustic velocities of bulk protein matter. This lowest frequency for common size molecules is shown to be above several hundred GHz. All modes below this frequency would then be intermolecular modes or bulk modes o...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20013
更新日期:2004-09-01 00:00:00
abstract::In the clinic, although several pharmacological agents or surgical procedures are used to treat diabetes and diabetes-induced neuropathic pain, their success has been limited. Therefore, development of different alternatives in treatments is very important. The purpose of this study was to determine the efficacy of pu...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20524
更新日期:2010-01-01 00:00:00
abstract::The aim of the present study was to identify the effects of a static magnetic field (SMF) on rat brain structures that control autonomic functions, specifically heart rate and heart rhythmicity. The experiments were carried out on 44 male Wistar rats under ketamine-xylazine anesthesia. SMF was induced using samarium-c...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.10186
更新日期:2004-04-01 00:00:00
abstract::Reports that low-intensity microwave radiation induces heat-shock reporter gene expression in the nematode, Caenorhabditis elegans, have recently been reinterpreted as a subtle thermal effect caused by slight heating. This study used a microwave exposure system (1.0 GHz, 0.5 W power input; SAR 0.9-3 mW kg(-1) for 6-we...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20515
更新日期:2009-12-01 00:00:00
abstract::The extent of electromagnetic interference (EMI) from 16.7-Hz alternate current power lines in the human surface electrocardiogram (ECG) was evaluated. Results showed a direct linear correlation between mean EMI and magnetic induction of 5.8-21 microT on a railroad platform (electric field: 270 V/m). EMI inside a rail...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20319
更新日期:2007-07-01 00:00:00
abstract::The main purpose of this study is to investigate potential responses of skin cells to millimeter wave (MMW) radiation increasingly used in the wireless technologies. Primary human skin cells were exposed for 1, 6, or 24 h to 60.4 GHz with an average incident power density of 1.8 mW/cm(2) and an average specific absorp...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20693
更新日期:2012-02-01 00:00:00
abstract::Sixty-Hz magnetic field exposures were measured for 45 adult residents of Maine. Thirty of the subjects resided near rights-of-way (ROWs) with either 345- and 115-kV transmission lines, or ROWs with only 115-kV transmission lines; fifteen resided far from any transmission lines. Personal exposure data for a single 24-...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.2250130106
更新日期:1992-01-01 00:00:00
abstract::In cancer therapy, magnetic drug targeting is considered as an effective treatment to reduce chemotherapy's side effects. The accurate design and shaping of magnetic fields are crucial for healthy cells to be immune from chemotherapeutics. In this paper, arbitrary 2-dimensional spatial patterns of magnetic fields from...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.22107
更新日期:2018-05-01 00:00:00
abstract::In this work we tested viability, proliferation, and vulnerability of neural cells, after continuous radiofrequency (RF) electromagnetic fields exposure (global system for mobile telecommunications (GSM) modulated 900 MHz signal at a specific absorption rate (SAR) of 1 W/kg and maximum duration 144 h) generated by tra...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20507
更新日期:2009-10-01 00:00:00
abstract::Since 1994, our research has demonstrated how thermophysiological responses are mobilized in human volunteers exposed to three radio frequencies, 100, 450, and 2450 MHz. A significant gap in this frequency range is now filled by the present study, conducted at 220 MHz. Thermoregulatory responses of heat loss and heat ...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20105
更新日期:2005-09-01 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::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::An elementary model consisting of one charged particle in a viscous medium exposed to weak ac-dc low-frequency magnetic fields is analyzed to identify and explain the fundamental characteristics of the physical mechanisms that result in a resonance response, which is similar to the familiar cyclotron resonance. The mo...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.2250090402
更新日期:1988-01-01 00:00:00
abstract::We studied the effect produced on the development and functional activity of skeletal muscle cells from newborn Wistar rats in primary culture by weak static magnetic fields (WSMF; 60-400 µT) with a high capacity of penetrating the biological media. To reduce the impact of external magnetic fields, cells were cultured...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.21876
更新日期:2014-12-01 00:00:00
abstract::To investigate the ability of prokaryotic microorganisms to activate strategies in adapting themselves to the environmental stress induced by exposure to extremely low frequency electromagnetic fields (ELF-EMF), cultures of Escherichia coli ATCC 700926 exposed at 50 Hz EMF (0.1, 0.5, 1.0 mT), and the respective sham-e...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20391
更新日期:2008-05-01 00:00:00
abstract::Ejaculated, density purified, human spermatozoa were exposed to pulsed 900 MHz GSM mobile phone radiation at two specific absorption rate levels (SAR 2.0 and 5.7 W/kg) and compared with controls over time. Change in sperm mitochondrial membrane potential was analysed using flow cytometry. Sperm motility was determined...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20390
更新日期:2008-05-01 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::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::Non-thermal plasmas can be generated by electric discharges in gases. These plasmas are reactive media, capable of superficial treatment of various materials. A novel non-thermal atmospheric plasma source (plasma needle) has been developed and tested. Plasma appears at the end of a metal pin as a submillimetre glow. W...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20005
更新日期:2004-07-01 00:00:00
abstract::A system is described that uses an oscillating magnetic field to produce power-frequency electric fields with strengths in excess of those produced in an animal or human standing under a high-voltage electric-power transmission line. In contrast to other types of exposure systems capable of generating fields of this s...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.2250050202
更新日期:1984-01-01 00:00:00
abstract::This study reports the continuous 8-h monitoring of data on extremely low-frequency magnetic fields (ELF-MF) relating to 14 children and 35 teachers in 11 elementary schools in Northern Taiwan. It was anticipated that the subjects in two of these campuses would have elevated exposure to ELF-MF as a result of their clo...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20431
更新日期:2008-10-01 00:00:00
abstract::The clinical and preclinical use of high-field intensity (HF, 3 T and above) magnetic resonance imaging (MRI) scanners have significantly increased in the past few years. However, potential health risks are implied in the MRI and especially HF MRI environment due to high-static magnetic fields, fast gradient magnetic ...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20664
更新日期:2011-10-01 00:00:00
abstract::Measurements have been made of vector current densities induced by vertical, uniform, 60-Hz electric fields in the torsos of homogeneous models of swine and rats. The observed data were a strong function of the five grounding configurations invested: all four feet grounded, only front feet grounded, only rear feet gro...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.2250090102
更新日期:1988-01-01 00:00:00
abstract::There is growing public concern that radio frequency electromagnetic fields may have adverse biological effects. In the present study eight healthy male students were tested to see whether or not radio frequency electromagnetic fields as used in modern digital wireless telecommunication (GSM standard) have noticeable ...
journal_title:Bioelectromagnetics
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1002/bem.51
更新日期:2001-05-01 00:00:00
abstract::Effects of magnetic fields (MFs) on the activities of antioxidant enzymes of suspension-cultured tobacco cells were investigated. Compared with the control cells, exposure of the cells to static MF with the magnitudes of 10 and 30 mT for 5 days, 5 h each day, increased the activity of superoxide dismutase (SOD). In co...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20262
更新日期:2007-01-01 00:00:00
abstract::The aim of this study was to determine a current density threshold for exciting the motor cortex area of the brain. The current density threshold for excitation of nerve fibres (20 microm in diameter) found in the literature is approximately 1 A/m(2) at frequencies lower than 1 kHz. In consideration of a safety factor...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.10036
更新日期:2002-09-01 00:00:00
abstract::We study the effect of microwaves at 2,450 MHz on protein unfolding using surface plasmon resonance sensing. Our experimental method makes use of the fact that unfolding proteins tend to bind to chaperones on their unfolding pathway and this attachment is readily monitored by surface plasmon resonance. We use the prot...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20382
更新日期:2008-05-01 00:00:00
abstract::The objective of the study was to investigate the influence of humidity on analyzing electric field exposure using extremely low frequency (ELF) electric field measurements. The study included 322 measurements in a climate room. We used two commercial three-axis meters, EFA-3 and EFA-300, and employed two measurement ...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.21776
更新日期:2013-07-01 00:00:00
abstract::Human glioma MO54 cells were used to investigate whether radio frequency (RF) field exposure could activate stress response genes. Cells were exposed to continuous wave 1950 MHz or sham conditions for up to 2 h. Specific absorption rates (SARs) were 1, 2, and 10 W/kg. For the cell growth experiment, cell numbers were ...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20077
更新日期:2005-05-01 00:00:00