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 occurs, separated by power-density regions in which no effect is observed. To explore the physiological importance of these findings, we have examined the impact of RFR exposure on a membrane-bound enzyme, acetylcholinesterase (AChE), which is intimately involved with the acetylcholine (ACh) neurotransmitter system. Neuroblastoma cells (NG108), exposed for 30 min to 147-MHz radiation, AM at 16 Hz, demonstrated enhanced AChE activity, as assayed by a procedure using 14C-labeled ACh. Enhanced activity was observed within a time window between 7.0 and 7.5 h after the cells were plated and only when the exposure occurred at power densities identified in a previous report as being effective for altering the release of calcium ions. Thus RFR affects both calcium-ion release and AChE activity in nervous system-derived cells in culture in a common dose-dependent manner.
journal_name
Bioelectromagneticsjournal_title
Bioelectromagneticsauthors
Dutta SK,Das K,Ghosh B,Blackman CFdoi
10.1002/bem.2250130407subject
Has Abstractpub_date
1992-01-01 00:00:00pages
317-22issue
4eissn
0197-8462issn
1521-186Xjournal_volume
13pub_type
杂志文章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::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::Drosophila larvae reared inside a micro-metal box with an internal field strength 0.004 microT, were treated with a magnetic field of 50 Hz, 8 microT. for 20 min. Control experienced 0.004 microT. Cellular transcript levels were assessed using slot blots and quantified using a Phosphorimager. Blots were hybridised usi...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:
更新日期:1999-01-01 00:00:00
abstract::Research conducted over the past 5 years has addressed the hypothesis that the reported association between residential magnetic fields and childhood leukemia may be explained by exposure to contact current. The use of multi-grounded neutrals in electrical distribution and residential electrical wiring systems in the ...
journal_title:Bioelectromagnetics
pub_type: 杂志文章,评审
doi:10.1002/bem.20126
更新日期:2005-01-01 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::We present a simple readout device that fills the void produced by the gradual disappearance of the Vitck model 101 Electrothermia Monitor. The new device uses commercially available probes that are similar to Bowman's (IEEE Trans Microwave Theory Tech MTT-24:43-45, 1976) original design. As described, the device cove...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.2250100210
更新日期:1989-01-01 00:00:00
abstract::Composition and content of lipids were studied in leaves of red perilla plants (Perilla nankinensis [Lour.] Decne.) grown in weak permanent horizontal magnetic field (PMF) of 500 µT flux density under controlled illumination, temperature, and humidity in the phytothron chamber. Control plants were grown under similar ...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.21957
更新日期:2016-02-01 00:00:00
abstract::We have shown that 50 Hz sinusoidal magnetic fields within the 5-10 microTesla (microT) rms range cause an intensity-dependent reduction in nerve growth factor (NGF) stimulation of neurite outgrowth (NO) in PC-12 cells. Here we report on the frequency dependence of this response over the 15-70 Hz range at 5 Hz interva...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.2250160607
更新日期:1995-01-01 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::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::Using a crossover experimental design, we evaluated our earlier findings that exposure to a 30 kV/m, 60 Hz electric field for 12 hours per day, 7 days per week for 6 weeks produced significant changes in the performance rates of social behaviors among young adult male baboons. In the crossover experiment, the former c...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.2250130506
更新日期:1992-01-01 00:00:00
abstract::We describe devices designed for magnetic field exposures in which field amplitude and gradients are controlled simultaneously. Dosimetry based on field continuation of high resolution magnetic field scans and numerical models is compared with validation measurements. The dosimetry variables we consider are based on t...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20098
更新日期:2005-05-01 00:00:00
abstract::Both eyes of anesthetized cynomolgus monkeys (Macaca fascicularis) were irradiated with 2.45-GHz microwaves, either pulsed or continuous wave. In vivo corneal endothelial abnormalities were observed by specular microscopy and confirmed through histologic techniques after a 16- to 48-hour postexposure period. Pulsed mi...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.2250060209
更新日期:1985-01-01 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::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::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::This study examined the time dependence effects of exposure to radiofrequency radiation (RFR) emitted by standard GSM cellular phones on the cognitive functions of humans. A total of 48 healthy right-handed male subjects performed a spatial working memory task (that required either a left-hand or a right-hand response...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20458
更新日期:2009-04-01 00:00:00
abstract::A 275-MHz exposure system, consisting of a circular waveguide irradiator and a transparent plastic animal cage, has been developed to accommodate rhesus monkeys weighing up to 15 kg. The vertically oriented waveguide is composed primarily of stainless steel and is fitted with an inner cage fabricated from a tubular se...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.2250050109
更新日期:1984-01-01 00:00:00
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::Mice were exposed in the far field in an anechoic chamber to 2,880-MHz pulsed microwaves 3 to 7.5 h daily, 5 days/week for 60 to 360 h. Three experiments were performed at average power densities of 5 mW/cm2 and six at 10 mW/cm2, corresponding to averaged specific absorption rates (SARs) of 2.25 and 4.50 mW/g, respect...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.2250040409
更新日期:1983-01-01 00:00:00
abstract::Extremely-low-frequency (ELF) and very-low-frequency (VLF) magnetic fields as emitted by monochrome and multichrome video display units (VDUs) were measured for their frequency domains. The rms magnetic-flux densities (MFDs) were measured as a function of distance from all six sides of VDUs of four types. The MFDs at ...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.2250120106
更新日期:1991-01-01 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::Little is known about the influence of magnetic fields on growth of primitive eukaryotes such as the ciliate Paramecium. The latter are known to exhibit interesting characteristics such as electrotaxis, gravitaxis, and membrane excitability not commonly encountered in higher organisms. This preliminary study reports t...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20172
更新日期:2006-01-01 00:00:00
abstract::Rat PC12 pheochromocytoma cells have been treated with nerve growth factor and then exposed to athermal levels of a packet-modulated radiofrequency field at 836.55 MHz. This signal was produced by a prototype time-domain multiple-access (TDMA) transmitter that conforms to the North American digital cellular telephone ...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/(sici)1521-186x(1997)18:3<223::aid-bem4>3.
更新日期:1997-01-01 00:00:00
abstract::Calcium (45Ca2+) efflux from preloaded synaptosomes was studied with a continuous perfusion technique and the rate constants of a two-phase efflux process calculated. When 16-Hz sinusoidally amplitude modulated 450-MHz microwave field (maximal incident intensity 0.5 mW/cm2, modulation depth 75%) was applied during the...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.2250030303
更新日期:1982-01-01 00:00:00
abstract::The goal of the research reported here is to narrow the range of uncertainty about peripheral nerve stimulation (PNS) thresholds associated with whole body magnetic field exposures at 50/60 Hz. This involved combining PNS thresholds measured in human subjects exposed to pulsed magnetic gradient fields with calculation...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.20106
更新日期:2005-09-01 00:00:00
abstract::This study was a meta-analysis to examine whether electrical stimulation has specific effects in the healing of musculoskeletal repair process and in the diminution of symptoms with bone and joint disorders. Using MEDLINE (1966-1999) and EMBASE (1985-1999) a search for articles was carried out with four medical subjec...
journal_title:Bioelectromagnetics
pub_type: 杂志文章,meta分析
doi:10.1002/bem.106
更新日期:2002-02-01 00:00:00
abstract::The objective of this study was to develop a model for testing various hypotheses concerning possible mechanisms whereby electromagnetic fields might induce suppression of nighttime melatonin production in rodents. A published method for digesting freshly obtained pineal glands to the single cell level was modified, y...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:
更新日期:1998-01-01 00:00:00
abstract::Serial longitudinal and transverse sections were prepared from roots of Cucumis sativus and Cucurbita maxima that had been exposed/sham-exposed to 60-Hz electric fields for 0-2 days. Field exposures were selected to produce a 10-20% or a 70-80% growth inhibition in whole roots of both species. Cortical cell length and...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.2250080108
更新日期:1987-01-01 00:00:00
abstract::A novel exposure system for double-blind human electromagnetic provocation studies has been developed that satisfies the precision, control of fields and potential artifacts, and provides the flexibility to investigate the response of hypotheses-driven electromagnetic field exposure schemes on brain function, ranging ...
journal_title:Bioelectromagnetics
pub_type: 杂志文章
doi:10.1002/bem.21710
更新日期:2012-09-01 00:00:00