جستجوی مقالات مرتبط با کلیدواژه "radio waves" در نشریات گروه "پزشکی"

We aimed to evaluate the impact of radiofrequency electromagnetic waves (RF-EMW) with wavelengths equivalent to mobile phones on semen parameters and expression levels of spermatogenesis-related genes in rats.

A total of 20 male adult Wistar rats weighing approximately 180 g were randomly allocated to two study groups in this controlled, parallel-design study. The case group was exposed to RF-EMW. The gene’s expression was assessed by real-time PCR for five target genes: ZBTB16, SCP3, ACR, ITGA6, and PRM1.

The DNA fragmentation index (DFI) assessment reveals a significant difference between the cases and the control group. There was a two-fold increase in ACR gene expression than in the RF-EMW exposure group. The contradictory result was seen in the other four genes, which showed that gene expression decreased to about 0.3 for PRM1 and SCP3, 0.5 for ITGA6, and 0.7 for ZBTB16. Sperm motility was not significantly different between the two groups, but morphology in the case group revealed higher abnormalities than in the control group.

We recommend reducing exposure time to radiofrequency waves, and keeping cell phones away from our bodies as far as possible is safer. Additional studies are required to support our data.

Radiofrequency electromagnetic radiation (RF-EMR) from mobile phones was reported to cause neurological damage. Hispolon pyrazole (HP) and hispolon monomethyl ether pyrazole (HMEP) were tested for their RF-EMR protection in rats.

Juvenile Wistar albino rats were exposed to the mobile phone generating 2400 MHz radiation with a maximum power output of 2 W/kg (Specific absorption rate 1.6 W/kg) for 90 days at a rate of 2 hours/day, treated with HP and HMEP at 20 and 40 mg/kg body weight. The elevated plus maze (EMT) test was used for anxiety and exploration evaluation, the forced swim test (FST) for depression, the Morris water maze test and Y-maze test for learning and memory. The oxidative stress markers like glutathione, superoxide dismutase (SOD), catalase (CAT), and malonaldehyde (MDA), and the neurotransmitters such as gamma-aminobutyric acid, glutamate, dopamine, and acetylcholinesterase along with histopathology in the cortex, striatum, and hippocampus were evaluated to establish the mechanism of the neuronal alterations of HP and HMEP against RF-EMR-induced damage.

In the current investigation, HP at a higher dose of 40 mg/kg and HMEP at both doses significantly reduced the oxidative stress generated by RF-EMR from mobile phones and altered neurobehavioral, neurotransmitter, and histological alterations.

Based on the findings, HP and HMEP at a dose of 40 mg/kg are protective agents against long-term, continuous mobile phone use and can be regarded viable therapeutic agents.

Due to the growing use of communication instruments such as cell phones and wireless devices, there is growing public concern about possible harmful effects, especially in sensitive groups such as pregnant women. This study aimed to investigate the oxidative stress induced by exposure to 900 MHz mobile phone radiation and the effect of vitamin C intake on reducing possible changes in pregnant mice.

Twenty-one pregnant mice were divided into three groups (control, mobile radiation-exposed, and mobile radiation plus with vitamin C intake co-exposed (200 mg /kg)). The mice in exposure groups were exposed to 900 MHz, 2 watts, and a power density of 0.045 μw /cm2 mobile radiation for eight hours/day for ten consecutive days. After five days of rest, MDA (Malondialdehyde), 8-OHdG (8-hydroxy-2' -deoxyguanosine), and TAC (Total Antioxidant Capacity) levels were measured in the blood of animals. The results were analyzed by SPSS.22.0 software.

The results showed that exposure to mobile radiation increased MDA (P=0.002), and 8-OHdG (P=0.001) significantly and decreased Total Antioxidant Capacity in the exposed groups (P=0.001). Taking vitamin C inhibited the significant increase in MDA and 8-OHdG levels in exposed groups.

Although exposure to mobile radiation can cause oxidative stress in the blood of pregnant mice, vitamin C as an antioxidant can prevent it.

 Extremely low frequency electromagnetic fields (ELF-EMF) are commonly present in daily life all over the world. This study was designed to investigate the effects of the different exposure intensity of the low frequency electromagnetic fields on the liver tissue.

 Adult male Wistar rats (n = 30) were randomly allocated in one of the experimental groups including; group A, exposure to 0.5 millitesla (mT) for 2-week (n = 5); group B, exposure to 0.5 mT for 4-week (n = 5); group C, control without radiation (n = 5); group D, exposure to 1 mT for 2-week (n = 5); group E, exposure to 1 mT for 4-week (n = 5); and group F, sham group (n = 5). At the end of the experiment, their liver tissue was dissected and clinically assessed by a pathologist.

 Our results show that for 1 month of exposure at 1 mT, focal hepatocitolysis and mild to moderate portal inflammation is visible and for 2 weeks exposure at this flux density, apoptosis and hepatocyte inflammation has occurred. However, for the groups exposed to 0.5 mT, 1 month exposure has caused hepatocyte focal inflammation, parenchymal hepatocitolysis, and focal apoptosis while, the exposure for 2 weeks did not affect the liver tissue.

 Exposure to ELF-EMF at the occupational limit cannot lead to irreversible changes and its effects on cells are enough below moderate changes. At the flux density of 1 mT, effects are moderate and irreversible and they are spread in larger areas than the lower flux density of 0.5 mT. Exposure time correlates with the level of stress on the cells; therefore, for a halftime exposure at occupational level, there exist no changes relative to the control group while for the fulltime exposure, some adverse effects were visible.

People who use home blood glucose monitors may use their mobile phones in the close vicinity of medical devices. This study is aimed at investigating the effect of the signal strength of 900 MHz GSM mobile phones on the accuracy of home blood glucose monitors. Sixty non-diabetic volunteer individuals aged 21 - 28 years participated in this study. Blood samples were analyzed for glucose level by using a common blood glucose monitoring system. Each blood sample was analyzed twice, within ten minutes in presence and absence of electromagnetic fields generated by a common GSM mobile phone during ringing. Blood samples were divided into 3 groups of 20 samples each. Group 1: exposure to mobile phone radiation with weak signal strength. Group2: exposure to mobile phone radiation with strong signal strength. Group3: exposure to a switched–on mobile phone with no signal strength. The magnitude of the changes in the first, second and third group between glucose levels of two measurements (׀ΔC׀) were 7. 4±3. 9 mg/dl, 10. 2±4. 5 mg/dl, 8. 7±8. 4 mg/dl respectively. The difference in the magnitude of the changes between the 1st and the 3rd groups was not statistically significant. Furthermore, the difference in the magnitude of the changes between the 2nd and the 3rd groups was not statistically significant. Findings of this study showed that the signal strength of 900 MHz GSM mobile phones cannot play a significant role in changing the accuracy of home blood glucose monitors.

The most common used methods for water disinfection were chemicals like chlorine, ozonation, ultraviolet radiation, membrane processes, etc. Water disinfection using irradiation techniques is new in water treatment industry which has been developed recently. The aim of the present study was to investigate radio frequency (RF) efficiency for the inactivation of total coliform (TC), fecal coliform, and heterotrophic bacterial count of water pellets. Tap water samples were taken from School of Public Health, Tehran University of Medical Sciences and irradiated using hydropad device, steam KLEAR model S-38 (1.2 W and frequency of 120-200 kHz). Microbial concentration was measured in cycles 1, 5, 10, 15, 20, 25, 30, 35, and 40 in 1 and 2 h contact time. Indicator bacteria were counted using plate count method and multiple fermentation tube technique. According to the microbial results, after 40 cycles and without chlorine residual, TC, fecal coliform, and heterotrophic bacteria were reduced by 86, 90, and 85%, while after 15 cycles and 0.8 mg/L chlorine residual, removal rate was 89, 91, and 89%, respectively. Furthermore, it was observed that after 2 h of contact time, TCs, fecal coliforms, and heterotrophic plate count were reduced by 78.2, 80, and 60%, respectively. Although RF efficiency in water disinfection has not been studied, our findings suggested its possible use due to more than 75% efficiency. From the standpoint of practical use, more studies should be done, especially to find a fine synergist agent, determining power, frequency, and suitable contact time and also the method should be modified.