Abstract:
:We sought to determine whether a 6-week exposure to a 50-Hz rotating magnetic field influences melatonin synthesis by 11-18 week-old Wistar-King male rats. Rats were exposed continuously to a rotating magnetic field at 1, 5, 50, or 250 microT (spatial vector rms) for 6 weeks, except for twice-weekly breaks of about 2 h for cleaning of cages and feeding. The rats were housed in exposure and sham-exposure facilities, which were located in the same room, under a 12:12 light-dark photoperiod (lights on at 06:00 h). The room was constantly illuminated by 4 small, dim red lights (< 0.07 lux in dark period). Levels of plasma and pineal gland melatonin were determined by radioimmunoassay. A significant decrease of melatonin was observed between the control group and groups exposed to a magnetic field at a flux density in excess of 1 microT during the night time, but no statistical differences were found among the exposed groups. These results indicate that subchronic exposure of albino rats to a 50-Hz rotating magnetic field influences melatonin production and secretion by the pineal gland.
journal_name
Bioelectromagneticsjournal_title
Bioelectromagneticsauthors
Kato M,Honma K,Shigemitsu T,Shiga Ydoi
10.1002/bem.2250140203subject
Has Abstractpub_date
1993-01-01 00:00:00pages
97-106issue
2eissn
0197-8462issn
1521-186Xjournal_volume
14pub_type
杂志文章abstract::The wide and growing use of cellular phones has raised questions about the possible health risks associated with radio frequency (RF) electromagnetic fields. It would be helpful for epidemiologists as well as cellular phone users to obtain the relative exposure levels, because the RF exposure level is very difficult t...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20203
更新日期:2006-09-01 00:00:00
abstract::In a previous investigation we reported that exposure to a moderate (300 mT) static magnetic field (SMF) causes transient DNA damage and promotes mitochondrial biogenesis in human umbilical vein endothelial cells (HUVECs). To better understand the response of HUVECs to the 300 mT SMF, a high-quality subtracted cDNA li...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20686
更新日期:2012-01-01 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
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::Exposures to radiofrequency (RF) energy above 6 GHz are characterized by shallow energy penetration, typically limited to the skin, but the subsequent increase in skin temperature is largely determined by heat transport in subcutaneous layers. A detailed analysis of the energy reflection, absorption, and power density...
journal_title:Bioelectromagnetics
pub_type: 杂志文章,评审
doi:10.1002/bem.22110
更新日期:2018-04-01 00:00:00
abstract::The influence of a pulsed magnetic field (PMF; sawtooth with 45-microseconds linear rise time and 5-microseconds decay time, peak strength of 15 microT, and frequency 20000 pps) [corrected] on the embryogenesis of CBA/S mice was investigated in five experiments based on a total of 707 exposed and 543 unexposed primigr...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.2250140303
更新日期:1993-01-01 00:00:00
abstract::The aim of this study was to elucidate the possible effects of short-term exposure to a 1439-MHz electromagnetic field (EMF) employing time division multiple access (TDMA), which is the basis of the Japanese Personal Digital Cellular system, on estrogenic activity in rats. Sixty-four ovariectomized female Sprague-Dawl...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20593
更新日期:2010-10-01 00:00:00
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journal_title:Bioelectromagnetics
pub_type: 杂志文章,评审
doi:10.1002/bem.2250100304
更新日期:1989-01-01 00:00:00
abstract::The effect of magnetized physiological solution (MPS) on isolated, perfused snail heart muscle contractility, (45)Ca uptake and intracellular level of cAMP, and cGMP was studied. The existence of the relaxing effect of MPS on heart muscle at room temperature (22 degrees C) and its absence in cold medium (4 degrees C) ...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20145
更新日期:2005-12-01 00:00:00
abstract::There is extensive literature on possible effects of extremely low-frequency magnetic fields (ELF-MFs) on human cognitive functions. However, due to methodological deficits (e.g., low statistical power, small sample sizes) findings have been inconsistent. In the current study we try to overcome these problems by carry...
journal_title:Bioelectromagnetics
pub_type: 杂志文章,meta分析
doi:10.1002/bem.20543
更新日期:2010-04-01 00:00:00
abstract::The effects of millimeter waves (MW) on human keratinocytes were studied in vitro using the HaCaT keratinocyte cell line. MW-induced modulation of keratinocyte function was studied in proliferation, adhesion, chemotaxis, and interleukin-1beta (IL-1beta) production assays. Spontaneous proliferation, adhesion to tissue ...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.62
更新日期:2001-07-01 00:00:00
abstract::This paper investigates the influence of pulsed magnetic fields (PMFs) on amplitude of evoked, compound action potential (CAP) recorded from the segments of sciatic nerve in vitro. PMFs were applied for 30 min at frequency of 0.16 Hz and intensity of 15 mT. In confirmation of our previous reports, PMF exposure enhance...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.21917
更新日期:2015-07-01 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 present analysis was stimulated by previous findings on the possible influence of natural ultralow-frequency (ULF; 0.001-10 Hz) geomagnetic field variations on the cardiovascular system and indications of an effect of man-made ULF magnetic fields on the rate of myocardial infarction. In the present study, we consi...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/(SICI)1521-186X(1996)17:6<436::AID-BEM2>3.
更新日期:1996-01-01 00:00:00
abstract::The temporal variation of a static electric field inside an animal cage was investigated with a newly developed small, simple field meter. The field inside the cage was found to be highly dependent on the surface conductivity of the dielectric material. As the surface of the cage became dirty because of animal occupan...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.2250020410
更新日期:1981-01-01 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::The present study investigates the effects of a weak (+/-200 microT(pk)), pulsed, extremely low frequency magnetic field (ELF MF) upon the human electroencephalogram (EEG). We have previously determined that exposure to pulsed ELF MFs can affect the EEG, notably the alpha frequency (8-13 Hz) over the occipital-parieta...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20434
更新日期:2009-01-01 00:00:00
abstract::Data are presented on ankle-specific SARs and foot currents as a function of strengths of radio-frequency electromagnetic fields encountered by operators of dielectric heaters. The determination of foot currents was based on near-field exposures in which reactive coupling dominates, and which can result in substantial...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.2250130204
更新日期:1992-01-01 00:00:00
abstract::Accumulating evidence does not yet confirm the effect of power line frequency magnetic field (MF) on human health and fertility. We recently reported that, at continuous 60 Hz MF exposure in mice, the dose given as magnetic flux density (tesla; T) and duration of exposure was related to induce testicular germ cell apo...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.22146
更新日期:2018-10-01 00:00:00
abstract::Vertigo-like sensations or apparent perception of movement are reported by some subjects and operators in and around high field whole body magnetic resonance body scanners. Induced currents (which modulate the firing rate of the vestibular hair cell), magneto-hydrodynamics (MDH), and tissue magnetic susceptibility dif...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20316
更新日期:2007-07-01 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::The effects of mm-waves 60.22-62.22 GHz and 75 GHz on A-type K+ currents and the effects of 61.22 GHz on Ca2+ currents of Lymnaea neurons were investigated using a whole-cell voltage-clamp technique. The open end of a rectangular waveguide covered with a thin Teflon film served as a radiator. Specific absorption rates...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:
更新日期:1999-01-01 00:00:00
abstract::Occupational exposure to the high static magnetic fields (SMFs) during magnetic resonance imaging (MRI) examinations raises concerns of adverse health effects. In this study, personal exposure monitoring of the magnetic fields during routine examinations in two 3 T MRI systems was carried out. A three-axis Hall magnet...
journal_title:Bioelectromagnetics
pub_type: 杂志文章,多中心研究
doi:10.1002/bem.21817
更新日期:2014-01-01 00:00:00
abstract::The use of prosthetic implants is increasing both in the United States and around the world and there is a concomitant rise in cases of biofilm-based, persistent infections that are quite serious and virtually impervious to antibiotic treatment. The development of alternate therapies that do not involve long term use ...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20529
更新日期:2010-01-01 00:00:00
abstract::The level of exposure of laboratory animals to 60-Hz electric fields is commonly specified in terms of the unperturbed field strength present before the introduction of experimental subjects and their cages. In the research reported in this paper, rats were housed in two parallel rows in 12.4 cm x 25.1 cm x 10.2 cm hi...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.2250020105
更新日期:1981-01-01 00:00:00
abstract::This study compares stationary home measurements with a personal exposure monitor of 60 Hz magnetic fields in a group of 18 people living near a 735 kV line and 17 people living far away from the line. Most of them were white collar workers who worked during the day. They wore a personal Positron meter for 24 h, while...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/(sici)1521-186x(199909)20:6<331::aid-bem1>
更新日期:1999-09-01 00:00:00
abstract::Effects of short, extremely high power microwave pulses (EHPP) on neuronal network function were explored by electrophysiological techniques in the isolated rat hippocampal slice model. Population spikes (PS) in the CA1 area were evoked by repeated stimulation (1 per 30 s) of the Schaffer collateral pathway. A brief t...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.10079
更新日期:2003-04-01 00:00:00
abstract::In-vitro studies of biological effects of electromagnetic fields are often conducted with cultured cells either in suspension or grown in a monolayer. In the former case, the exposed medium can be assumed to be homogeneous; however, eventually the cells settle to the bottom of the container forming a two layer system ...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.2250140106
更新日期:1993-01-01 00:00:00
abstract::Nanosecond electric pulse (nsEP) exposure generates an array of physiological effects. The extent of these effects is impacted by whether the nsEP is a unipolar (UP) or bipolar (BP) exposure. A 600 ns pulse can generate 71% more YO-PRO-1 uptake compared to a 600 ns + 600 ns pulse exposure. This observation is termed "...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.22134
更新日期:2018-09-01 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