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Showing 8 results for Electromagnetic Field
M. Jadidi, Dr. S.m.p. Firoozabadi, A. Rashidy-Pour, B. Bolouri, Y. Fathollahi,
Volume 5, Issue 3 (12-2007)
Abstract
Introduction: Over the last decade, exposure to non-ionizing electromagnetic waves due to base station antenna has increased. This in vivo study was planned for evaluating the effects of whole-body exposure to 950 MHz field of GSM mobile phone system on rat dentate gyrus long-term potentiation. Materials and Methods: 24 naive male Wistar rats (3 month old, 225|¡|25 g) were randomly divided in the three groups (sham-exposed, GSM and continuous field exposed). The exposure program was planned for 10 sessions at 3 days. Animals were exposed to electromagnetic field for 45 minutes in a circular plastic chamber (mean power density=0.835 mW/cm2). Immediately after end exposure, anesthesia was induced for long term potentiation (LTP) induction. Field potentials were recorded and analyzed using the population spike amplitude and EPSP slope for 60- min. Results: There were no significant differences in population spike amplitude, EPSP slope and EPSP slope maintenance among the three groups. Conclusion: This study provides no evidence indicating that long-term potentiation can be affected by the whole-body exposure to low-power density of 950 MHz field of GSM mobile phone system.
S.a. Falahati, M. Anvari, M.a. Khalili,
Volume 9, Issue 3 (12-2011)
Abstract
Background: In previous investigations, it has
been clarified that electromagnetic fields (ELF) can
cause some changes in cellular behavior. The aim of
this prospective study was to investigate the effect of
magnetic field (MF) on human sperm parameters of
motility, morphology, and viability. Materials and
Methods: Semen samples were collected from 12
fertile men, and were allowed to liquefy for 15-30
min. Each sample was then divided into two aliquots.
The experimental samples were placed in the ELF,
while the control one was left intact. The applied
fields were pulsed with distance of 6 m/ sec and
effective intensity of 1mT and different frequencies of
10, 25 and 45 Hz at different time intervals. The
constant field intensity was 1mT in all experiments.
Results: In frequency of 10Hz, an increase in quick
motility of sperm (1.8 times) occurred after 4h
however, slow motility was decreased by 40% after
2h. Also, the quick motility increased by 1.6 times in
frequency 25 Hz after 4 h, while the MF had no effect
on other sperm parameters. MF had no effect on any
of sperm parameters in frequency of 40 Hz in 4 h.
The stimulation ratio on the sperm viability was only
significant at frequency of 10 Hz after 2 h after
incubation. The sperm morphology was not
influenced in any of the fields. Conclusion: This study
reports the existence of certain frequency windows
for the resonance of the effects of the MF on human
spermatozoa. Rapid motility was significantly affected
by the exposure of spermatozoa to MF, but sperm
structural parameter had remained intact. Iran. J.
Radiat. Res., 2011 9(3): 195-200
E. Kazemi, Dr. S.m.j. Mortazavi, A. Ali Ghanbari, H. Mozdarani, S. Sharif-Zadeh, Z. Mostafavi-Pour, F. Zal, S. Haghdoost,
Volume 13, Issue 3 (7-2015)
Abstract
Background: Induction of cellular response after exposure to electromagnetic fields is limited to coherent fields. An incoherent noise field is supposed to suppress the bioeffects of regular RF electromagnetic fields. The purpose of this study was to investigate the effect of GSM mobile phone-induced radiofrequency (RF) on the induction of oxidative stress in SP2/0 cell line. Materials and Methods: This study was also an attempt to assess whether these RF-induced effects can be blocked by superposing the RF radiation and an incoherent magnetic noise. Three groups of cultured cells were used in this study. The cells in the first group were only exposed to RF radiation emitted from a mobile phone simulator. The second group was only exposed to an incoherent noise field and the third group was simultaneously exposed to RF radiation and incoherent noise field. The exposure duration in all groups was 2 hours. The level of ROS production in the cells was quantified by the CM-H2DCFDA fluorescence probe, using flow cytometry technique. Results: Although our results showed increased ROS production after exposure to 900 MHz RF radiation, superposition of 900 MHz RF and the incoherent noise fields did not lead to increased levels of ROS in any experiment. However, the differences between RF exposure group and superposition of RF and noise exposure group were not statistically significant. Conclusion: Altogether our results cannot support the neutralizing effect of noise theory but may confirm the concept that just the coherent fields can be bioeffective while the incoherent noise fields cannot cause any biological effects.
R. Mahmoudi, Dr. S.m.j. Mortazavi, S. Safari, M. Nikseresht, H. Mozdarani, M. Jafari, A. Zamani, M. Haghani, M. Davari, A. Tabatabaie,
Volume 13, Issue 4 (10-2015)
Abstract
Background: Wi-Fi allows electronic devices such as laptops to exchange data or connect to a network resource. The main goal of this study was to assess the bioeffects of short term exposure to 2.4 GHz microwave radiation emitted from a common Wi-Fi router on sperm quality. Materials and Methods: Male Wistar rats were divided into 7 groups; I, sham exposed 4 h/day for 7days at 30 cm from the router. II, exposed for 2 h/day for 7days at 30 cm and sacrificed after 53 days. The exposure protocols for groups III to VII were 2h – 30 cm, 2h – 60 cm, 4 h – 30 cm, 4 h- 60 cm, 4 h – 30 cm (no data exchange) respectively. Rats in all the groups except group II, were sacrificed immediately after exposure and basic parameters of testicles weight, sperm motility, morphology, count, and DNA fragmentation were studied. Non-parametric tests were used to detect statistically significant differences between different groups. Results: Findings of this study showed statistically significant differences between the relative frequency of progressive and rapid progressive sperms in sham exposed rats compared to those of exposure groups. The testicles weight, DNA fragmentation of sperms and the frequency of sperms with normal morphology were not affected by Wi-Fi radiation. However, statistically significant differences between sperm count of the sham exposed rats compared to those of exposure group were observed. Conclusion: Exposure to microwave radiation emitted from Wi-Fi routers affects sperm parameters such as count and motility which are among the key parameters determining the chance of conceiving.
Ph.d., F.m. Gur, A. Ikinci Keles, H.s. Erol, C. Guven, E. Taskin, H. Kaya, H.e. Gur, E. Odaci, M.b. Halici, S. Timurkaan,
Volume 19, Issue 1 (1-2021)
Abstract
Background: Mobile phones as an electronic device which are emitting radiofrequency-electromagnetic field (RF-EMF). In this study was intend to determine the contingent effects of cell phone induced RF-EMF on testicular tissue in adolescence. Materials and Methods: Rats in the RF-EMF group were exposed to 900 MHz RF-EMF, while sham and control rats were not. After the completion of the test steps, the testicular tissues which were rapidly removed from the body of sacrificed rats were examined by using histopathological and biochemical methods. Testicular tissues cut to 5 µm thickness undergo routine histological procedures. Thus, histopathological evaluation will be completed. Malondialdehyde (MDA), glutathione (GSH), catalase (CAT) and superoxide dismutase (SOD) levels in testicular tissues were measured by biochemical methods to determine whether oxidative stress occurred or not. Results: Histopathologic findings were not observed in any of the studied groups. There was also no difference between the groups in terms of localization of androgen and estrogen receptors. The incidence of apoptotic index and TUNEL-positive cells was similar in all three groups. In the RF-EMF group, although the levels of MDA and CAT were significantly higher, GSH levels were lower than the other groups. There was no essential difference between the groups in terms of SOD level. Conclusions: The obtained results of this study showed that exposed to 900 MHz RF-EMF in adolescents caused oxidative stress in the testes, but testicular damage which is caused to oxidative stress is remained too low to be detected by histopathological methods in this study.
H. Yucel, N.o. Dundar, D.k. Doguc, C. Uguz, O. Celik, F. Tutku Aksoy, M. Nazıroglu, S. Comlekci, B. Dundar,
Volume 20, Issue 4 (10-2022)
Abstract
Background: Electromagnetic fields may primarily affect cognitive functions. It has not been elucidated how electromagnetic radiation affects the brain, particularly in the young age group. We aimed to examine the cognitive function, expression of N-methyl-D-aspartate receptors (NMDA), and EEG alterations in weaned rats exposed to a 2.45 GHz electromagnetic field. Materials and Methods: Twenty-one weaned (21 days old) male Wistar Albino rats were divided into two groups as experimental group (n=12) and control group (n=9). Animals in the experimental group were exposed to a 2.45 GHz electromagnetic field for one hour a day for more than 28 days. At the end of this period, rats were subjected to training and learning test using Morris Water Maze. After obtaining EEG records, hippocampi were removed. 2A and 2B subunits of NMDA receptors were studied in hippocampal homogenates using the Western Blot method. Results: There were no statistically significant differences between the two groups in measures of latency to target quadrant, time spent in the target quadrant, and average swim speed as compared in Morris water maze. However, the time to arrive at the visible platform was significantly longer in experimental animals. There were no statistically significant differences in expression of 2A and 2B subunits of NMDA receptors between the two groups. Evaluation of EEG records revealed that spike frequency was significantly higher and time to first spike was significantly shorter in the experimental group. Conclusion: These results indicated that a 2.45 GHz electromagnetic field might negatively affect EEG, motivation, and attention, particularly in the young age group.
T. Jadidi, N. Asadian, Ph.d., M. Jadidi, M. Safari, H.r. Sameni, V. Semnani,
Volume 21, Issue 1 (1-2023)
Abstract
Background: Some growth factors and electromagnetic fields (EMFs) are capable to differentiate bone marrow mesenchymal stem cells (BMMSCs) into neural cells. EMF may induce BMMSCs to differentiate into dopaminergic (DA) neurons. Our aim was to analyze the influence of EMF on BMMSCs in the treatment of rat models of Parkinson's disease. Materials and Methods: BMMSCs were extracted from the rat’s hind limbs and incubated in a cell-cultured CO2 incubator. After the third passage, the BMMSCs were exposed to sinusoidal and square waveform EMF (400 µT, 75 Hz, 1 h/day - 1 week or 7 h/1 day) and injected into the substantia nigra region of Parkinson rats. Results: The results confirmed an increased number of TH+ neurons, a reduction of activated astrocytes, and an improvement in locomotor activity (Pole test) of sinusoidal EMF groups. Conclusion: We presented a low-frequency sinusoidal EMF that increased BMMSCs’ differentiation into DA neurons. The results indicated that injection of BMMSC exposed to sinusoidal 75 Hz EMF may increase TH+ cells in SNpc and motor coordination activity in the rat model of Parkinson's disease.
I.p. Karaman, O. Coskun, N. Senol, M. Sahin, S. Comlekci,
Volume 22, Issue 3 (7-2024)
Abstract
Background: The goal of this study was to analyze the prophylactic effects of quercetin (Qu) against testes damage induced by 2600 MHz electromagnetic field (EMF) in rats. Materials and Methods: Thirty-two male rats (Wistar-Albino) were indiscriminately separated into four groups which were named: Control, Sham-exposed, EMF-exposed (EMF, 1 h day−1 for 30 days), and EMF + Qu (100 mg/kg/daily) groups. After 30 days, the rats were sacrificed, testicular tissues were taken, and routine procedures were performed for histological and immunohistochemical evaluations. Results: When the testicular tissue of the control group was evaluated histopathologically, it was concluded that structures such as Leydig cells and seminiferous tubules were in normal condition and there was no change. No bleeding or inflammation was observed in the general structure of testicular tissues. Irregularities in spermatogenic cell configuration and shedding in the seminiferous epithelium were observed in the EMF and EMF + Qu groups. Findings close to our control group were detected in the sham-exposed and EMF + Qu groups. In addition, tumor necrosis factor-α (TNF-α) immune reactions in were EMF+ Qu group was decreased compared to the EMF group. Conclusion: In histopathological and immunohistochemical evaluation, it has been proven that EMF causes damage to testicular tissue. However, Qu demonstrated partial ameliorative effects on the pathological findings of the current study.
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