Browse 6,486 peer-reviewed studies on electromagnetic field health effects from 4 research libraries.
Showing 1,633 studies in Cellular Effects
Pereira C, Edwards M · 2000
The study aimed to examine parotid nodular fasciitis in a mobile phone user. The authors report the first case of nodular fasciitis affecting the deep lobe of the parotid gland in a 39-year-old male telephone engineer.
Mezhevikina LM, Khramov RN, Lepikhov KA · 2000
Researchers cultured two-cell mouse embryos in vitro and exposed them to electromagnetic irradiation in the millimeter range. After 30 min of exposure, the embryos acquired the ability to develop on their own and could reach the stage of blastocyst in 150 microliters of Whitten cultural medium without serum or growth factors. The authors proposed that millimeter range electromagnetic waves activate metabolic processes and specifically the synthesis of factors controlling early embryonic development in culture.
Lourencini da Silva R et al. · 2000
Researchers exposed SnCl2-treated pBR322 plasmids to EMF and analyzed conformational changes using agarose gel electrophoresis. EMF exposure increased DNA scission, seen as relaxed plasmids. Plasmids pre-exposed to EMF were less able to transform E. coli. The authors concluded that EMF in the presence of a transition metal can cause DNA damage.
Leshin VV · 2000
Researchers aimed to investigate changes in neurocytes of the central nervous system under general UHF field exposure with local protection applied. Experiments on white rats studied the influence of UHF field on the cortical sensomotor area under general exposure or with the head shielded. The changes in the central nervous system caused by UHF field were not completely prevented by the shield, which the authors attributed to pathologic reflex impulses from body receptors.
Laurence JA, French PW, Lindner RA, Mckenzie DR · 2000
The aim was to investigate mechanisms for the effects of pulsed microwave radiation on protein conformation. The researchers modeled heat diffusion and showed that pulsed exposure can cause transient temperature excursions outside the normal range even when athermal. They propose that the power window phenomenon may be caused by incomplete triggering of the heat shock response.
Kalns J, Ryan KL, Mason PA, Bruno JG, Gooden R, Kiel JL. · 2000
Gapeev AB, Chemeris NK · 2000
Researchers used a mathematical model to analyze how modulated extremely high frequency electromagnetic radiation affects intracellular calcium concentration in neutrophils. The model showed that the calcium rise depends on both the frequency and phase of the modulating signal relative to chemical stimulation. A rise above 50% of the initial calcium level occurred at about 1 Hz and phase range 0.3-2.5 radians, but only when modulating signal intensity exceeded a threshold and chemical stimulus intensity was high. Added noise changed the phase-frequency characteristics and created multiple response bands with higher Q-factors. The model results matched earlier experimental data showing effects only with extracellular calcium and high calcium ionophore A23187 concentrations.
Del Signore A, Boscolo P, Kouri S, Di Martino G, Giuliano G · 2000
Researchers studied immune responses to electromagnetic fields in atopic and non-atopic women with traffic exposure. Women were divided into groups A, B, C, and D based on atopy and electromagnetic field exposure. Atopic women had reduced in vitro lymphocyte proliferation when stimulated with PHA. Women exposed to electromagnetic fields had lower NK cell levels and lower interferon-gamma production. Atopic women exposed to electromagnetic fields had higher serum IgE than other groups.
Chiabrera A, Bianco B, Moggia E, Kaufman JJ, · 2000
The aim of the study was to observe Zeeman-Stark modeling of the RF EMF interaction with ligand binding. The model accounts for ion collision losses, endogenous forces, metabolic non-equilibrium, and thermal noise. The model predicts that ligand binding probability may be affected by low-intensity exogenous EMF when the receptor's potential energy well matches the radiofrequency photon energy. The authors state that the results point toward electromagnetic control of biochemical processes and the need for a new database of safety standards.
Brezitskaia HV, Timchenko OI · 2000
The study aimed to observe the mechanism of cytogenetic effect of electromagnetic radiation and the role of oxidation homeostasis. Changes in oxidation homeostasis preceded development of cytogenetic effects and could be their reason.
Apollonio F, D'Inzeo G, Tarricone L. · 2000
The study presents an evaluation of microwave field effects on the acetylcholine receptor channel based on energy issues. Observation of biochemical parameters demonstrated that microwave fields cause conformational changes in the receptor site. An energetic mapping of acetylcholine conformational changes was achieved, clearing ground for future molecular simulations. The channel was considered a stochastic automaton flipping randomly between states, and the incident field modifies transitions among the states.
Romano-Spica V, Mucci N, Ursini CL, Ianni A, Bhat NK · 2000
Researchers analyzed gene expression in hemopoietic and testicular cell types after exposure to 50 MHz radiofrequency radiation modulated at 16 Hz. They observed overexpression of ets1 mRNA in Jurkat T-lymphoblastoid and Leydig TM3 cell lines only when the 16 Hz modulation was present. A putative candidate gene was also repressed after EMF exposure.
Peinnequin A et al. · 2000
Pashovkina MS, Akoev IG · 2000
Researchers studied the activity of alkaline phosphatase during exposure to pulse-modulated microwave radiation. The carrier frequency was 2375 MHz with modulation pulse rates of 10-390 Hz, on-off time ratio 2, and specific absorption rates of 8 and 0.8 microW/cm2. At a modulation frequency of 70 Hz, alkaline phosphatase activity increased 1.8-2.0 times. Exposure times were 1 and 3 minutes under continuous temperature control.
Olchowik G, Maj JG · 2000
Researchers investigated the influence of microwave irradiation on gamma-glutamyl transpeptidase activity induced by hydrocortisone in rat liver. Rats received hydrocortisone at 20 mg/kg for 60 days and were exposed to microwave radiation at 53.57 GHz with power densities of 10 mW/cm2 and 1 mW/cm2 during and after treatment. The results indicate that microwave radiation may block the hydrocortisone-induced effect on GGT activity, and this blocking effect depends on the power density of the millimetre microwaves.
Harvey C, French PW · 2000
Researchers exposed a human mast cell line, HMC-1, to continuous wave microwave radiation at 864.3 MHz at an average specific absorption rate of 7 W/kg. Cells were given three exposures each of 20-min duration daily for 7 days. Expression of three genes out of 588 screened was affected, including the proto-oncogene c-kit, the transcription factor Nucleoside diphosphate kinase B, and the apoptosis-associated gene DAD-1. No significant effect on morphology or on F-actin distribution was detected.
Gos P, Eicher B, Kohli J, Heyer WD · 2000
Researchers exposed actively growing and resting yeast cells to 900 MHz fields at specific absorption rates of 0.13 and 1.3 W/kg. Assays measured forward mutation rates at CAN1, petite clone formation, intrachromosomal deletion formation, and intragenic recombination in the ADE2 gene. Fields were also tested in combination with the alkylating agent methyl methansulfonate to assess whether they could enhance genotoxic damage. Fluctuation tests failed to detect any significant effect on any of these measures, in the absence or presence of methyl methansulfonate.
de Pomerai D et al. · 2000
Researchers exposed nematode worms (C. elegans) overnight to 750-MHz microwaves at a SAR of 0.001 W/kg and measured levels of heat-shock proteins (HSPs). The worms showed an increase in HSPs following that exposure. The authors argued that the effect on HSPs was non-thermal and suggested that 'current exposure limits for microwave equipment may need to be reconsidered.'
Noda Y, Mori A, Liburdy RP, Packer L · 2000
Researchers investigated the effect of pulsed magnetic fields on nitric oxide synthase (NOS) activity in the rat brain. A significant increase in NOS activity was observed in the cerebellum at 111.2±2.0% (P<0.05) for a 1 Gauss (0.1 mT) pulsed DC field, across five separate experiments. Neither AC nor static DC field treatment showed any significant change in NOS activity. In the hippocampus, cortex, medulla oblongata, hypothalamus, striatum, and midbrain, only a slight change or no effect was observed.
Zotti-Martelli L, Peccatori M, Scarpato R, Migliore L · 2000
Researchers exposed human peripheral blood lymphocytes in vitro to electromagnetic fields at two frequencies, 2.45 and 7.7 GHz, at power densities of 10, 20, and 30 mW/cm2 for 15, 30, and 60 minutes. At a power density of 30 mW/cm2 and after exposures of 30 and 60 minutes, both frequencies led to an induction of micronuclei compared to control cultures. The researchers concluded that microwaves are able to cause cytogenetic damage in human lymphocytes mainly for both high power density and long exposure time.
Unknown authors · 1999
Researchers investigated the effect of 50 Hz magnetic fields on the cytosolic calcium oscillator in Jurkat E6.1 cells at field strengths from 0 to 0.40 mT root mean square. The total spectral power of the cytosolic Ca2+ oscillator was reduced by magnetic field exposure and the effect increased in a dose-response manner. This reduction was also observed in the 0-10 mHz subinterval of the oscillation spectrum, while higher frequency subintervals showed no significant change.
Vijayalaxmi et al. · 1999
Peripheral blood and bone marrow smears were examined for micronuclei in polychromatic erythrocytes at 18 and 24 hours after exposure. No statistically significant differences were found in micronuclei frequency or percentage of polychromatic erythrocytes between exposed mice and controls.
Linz et al. · 1999
Researchers tested the effects of radio frequency fields at 180, 900, and 1800 MHz on the electrical properties of isolated ventricular myocytes from guinea pigs and rats. The fields were applied using rectangular waveguides or a TEM cell at specific absorption rates up to 880 mW/kg, with 900 and 1800 MHz signals pulsed to the GSM standard. None of the tested electrophysiological parameters, including membrane potential, action potential, L-type calcium current, and potassium currents, were significantly changed by RF exposure. Lowering the temperature from 36°C to 24°C reduced current amplitude by almost 50% and shifted voltage dependence by about 5 mV, but RF exposure at the lower temperature still did not affect L-type calcium current.
Li et al. · 1999
Researchers exposed human fibroblast cells to 837 MHz continuous microwaves for 2 hours at SAR levels of 0.9 or 9.0 W/kg. TP53 protein levels were measured by Western blot at 2, 8, 24, and 48 hours after exposure. No significant changes in TP53 protein expression were found in exposed cells compared to sham or untreated cells at any time point. No morphological alterations were observed in microwave-treated cells compared to sham-treated cells.
Goswami PC et al. · 1999
Researchers exposed C3H 10T 1/2 mouse embryo fibroblasts to 835.62 MHz FMCW or 847.74 MHz CDMA microwaves at an average SAR of 0.6 W/kg and measured proto-oncogene expression. The exposures did not alter proto-oncogene expression kinetics after serum stimulation, nor did they change Jun and Myc mRNA levels or AP1, AP2, and NF-kappaB DNA-binding activity during the transition to plateau phase. However, 835.62 MHz FMCW exposure increased Fos mRNA about 2-fold in exponential and plateau-phase cells, and 847.74 MHz CDMA exposure increased it 1.4-fold.