Unknown authors · 2009
Pregnant rats were exposed to 900 megahertz electromagnetic fields during gestation days 1-19. Offspring were sacrificed at the end of the 4th week and pyramidal cell numbers in the cornu ammonis were estimated using the optical fractionator technique. Exposure significantly reduced the total pyramidal cell number in the cornu ammonis (P < 0.001).
Dasdag S, Akdag MZ, Ulukaya E, Uzunlar AK, Ocak AR · 2009
The study used 31 Wistar Albino adult male rats, with the exposed group having their heads placed in a carousel and exposed to 900 MHz microwave radiation for 2 hours per day, 7 days a week, for 10 months. The apoptosis score in exposed rats was significantly lower than in both the sham group and the cage control group. Total antioxidant capacity and catalase were higher in the exposed group than in the sham group, while the oxidative stress index showed no significant difference between those groups. The protein p53 was not significantly changed by the exposure.
Dasdag S, Akdag MZ, Ulukaya E, Uzunlar AK, Ocak AR. · 2009
Turkish researchers exposed rats to cell phone radiation (900 MHz) for 2 hours daily over 10 months to study brain cell death and oxidative stress. Surprisingly, they found that radiation exposure actually reduced brain cell death (apoptosis) and increased antioxidant activity compared to unexposed rats. This unexpected protective effect challenges assumptions about cell phone radiation's impact on brain tissue.
Di Loreto S et al. · 2009
Researchers investigated the effects of exposures to two different 50 Hz sinusoidal ELF magnetic field intensities, 0.1 and 1 mT, on maturing rat cortical neurons. Exposure positively affected cell viability and reduced apoptotic death, with no significant effects on the main antioxidative defences. Linear regression analysis suggested a positive correlation between reduced glutathione and ROS levels in 1 mT magnetic-field-exposed cells. The researchers also observed brain-derived neurotrophic factor over-expression and interleukin 1β-dependent regulation of pro-survival signaling pathways following exposure.
Belyaev IY, Markovà E, Hillert L, Malmgren LO, Persson BR. · 2009
The study investigated microwaves from UMTS and GSM mobile phones on human lymphocytes. UMTS microwaves inhibited the formation of DNA repair foci in lymphocytes from both hypersensitive and healthy individuals. The inhibition persisted for up to 72 h after exposure, longer than the stress response to heat shock. Effects of GSM microwaves depended on carrier frequency. No significant differences were found between hypersensitive and healthy groups, except for specific responses to UMTS and GSM-915 MHz microwaves.
Sharma VP, Singh HP, Kohli RK, Batish DR. · 2009
Researchers exposed mung bean (Vigna radiata) seeds to cell phone EMF radiation at a power density of 8.55 microW cm(-2) in the 900 MHz band for durations of 1/2, 1, 2, and 4 hours. Cell phone EMF radiation significantly inhibited germination at exposures of 2 hours or more, and inhibited radicle and plumule growth at 1 hour or more, in a time-dependent manner. The radiation enhanced MDA content, increased hydrogen peroxide accumulation, and raised root oxidizability, indicating oxidative stress and cellular damage. The study concluded that cell phone EMF radiation inhibits root growth by inducing oxidative stress despite increased activities of antioxidant enzymes.
Sharma VP, Singh HP, Kohli RK, Batish DR · 2009
Researchers exposed mung bean sprouts to 900 MHz cell phone radiation and found it significantly stunted root growth and seed germination within just one to two hours. The radiation caused oxidative stress, demonstrating that radio frequency signals can disrupt basic biological processes in living organisms.
Unknown authors · 2009
They analyzed 53BP1 foci marking DNA repair sites using laser confocal microscopy. Microwaves inhibited 53BP1 focus formation in both human primary fibroblasts and mesenchymal stem cells, with the same GSM (915 MHz) and UMTS (1947.4 MHz) frequencies effective across all cell types. Exposure at 905 MHz did not inhibit foci in differentiated cells but showed some effects in stem cells, and stem cells did not adapt to chronic exposure over 2 weeks unlike fibroblasts.
Unknown authors · 2009
Researchers exposed human stem cells and mature cells to cell phone radiation at frequencies used by GSM (915 MHz) and UMTS (1947.4 MHz) networks. They found that radiation disrupted DNA repair processes more severely in stem cells than in mature cells, with stem cells showing impaired formation of proteins needed to fix DNA breaks. This matters because stem cells are particularly important for cancer development, and the study suggests they may be more vulnerable to cell phone radiation damage.
Sannino A et al. · 2009
Lymphocytes were collected at 72 hours to measure micronuclei frequency in cytokinesis-blocked binucleated cells. Four donors exhibited a significant reduction in micronuclei after RF pre-exposure, indicating an adaptive response. One donor showed no significant difference in micronuclei between pre-exposed and unexposed cells, indicating a non-responder. The data indicated heterogeneity in the induction of an adaptive response between individuals exposed to RF radiation.
Unknown authors · 2009
Researchers found that an ultralow-frequency, extremely weak alternating magnetic field component showed marked antitumor activity when combined with a static magnetic field. The alternating field parameters that produced this effect were frequencies of 1, 4.4, or 16.5 Hz at intensities of 300, 100, or 150–300 nT, combined with a collinear static field of 42 µT. In mice with tumors, tumor tissue was practically absent after exposure to the weak magnetic fields, while control animals showed tumor invasion into surrounding tissues. In animals without tumors, no pathological deviations were observed after exposure to the weak magnetic field, suggesting the field was not toxic to healthy organisms.
Unknown authors · 2009
Researchers exposed mice with Ehrlich ascites carcinoma to extremely weak magnetic fields (as low as 100-300 nT at frequencies of 1, 4.4, and 16.5 Hz) combined with a static field of 42 µT. The treatment dramatically inhibited tumor growth, with tumor tissue practically absent in treated mice while control mice showed extensive cancer spread. Healthy mice showed no adverse effects from the same magnetic field exposure.
Reba Goodman et al. · 2009
Researchers used regenerating planaria Dugesia dorotocethala as a model to determine whether an intermittent modulated extremely low frequency electromagnetic field produces elevated levels of hsp70 and stimulates intracellular pathways known to be involved in injury and repair. Individual head and tail portions from the same worm were exposed to a 60 Hertz 80 milliGauss ELF-EMF for 1 h twice daily for 15 days post-transection. ELF-EMF exposure caused a significant increase in regeneration for both heads and tails, and exposed tails developed eyes at day seven post-transection, while sham control tails showed the first appearance of eyes 48 h later. Exposed animals also showed an elevation in hsp70 protein, an activation of an ERK cascade, and an increase in SRF-SRE binding.
Daniels WM, Pitout IL, Afullo TJ, Mabandla MV · 2009
Researchers studied the effect of electromagnetic radiation in the mobile phone range on the behaviour of the rat. Behavioural, histological and biochemical tests were performed on exposed and unexposed male and female rats to examine learning and memory, emotional states and corticosterone levels. No significant differences were found in spatial memory or brain morphology between groups, but some exposed animals showed decreased locomotor activity, increased grooming and a tendency of increased basal corticosterone levels. The researchers suggested that EMR exposure may lead to abnormal brain functioning.
Gajski G, Garaj-Vrhovac V. · 2009
Researchers exposed rat blood cells to 915-MHz microwave radiation (the same frequency used in some mobile phones) for 4 hours and found it caused DNA damage. However, when they pre-treated the cells with bee venom, it significantly reduced this DNA damage, suggesting bee venom has protective properties against microwave radiation effects.
Sommer et al. · 2009
Male and female C57BL mice were exposed lifelong to UMTS fields at 1966 MHz with SARs of 0, 0.08, 0.4, and 1.3 W/kg. Development and fertility were tracked over four generations using histological, physiological, reproductive, and behavioral measures. No harmful effects on fertility or development were observed. Pup numbers and development were unaffected by exposure. Some data suggested effects on food consumption without a clear dose-response relationship.
Furubayashi T et al. · 2009
Researchers conducted a double-blind, cross-over study with 11 women reporting mobile phone related symptoms and 43 control women. Participants were exposed to 2.14 GHz W-CDMA fields at 10 V/m for 30 minutes under continuous, intermittent, and sham conditions. The symptom group did not detect real exposure better than controls but reported more discomfort during both real and sham exposure, with no differences in psychological, cognitive, or autonomic measures.
Furubayashi T et al. · 2009
Researchers exposed 54 women (including 11 with self-reported electromagnetic hypersensitivity) to cell tower radiation at 10 V/m for 30 minutes in a controlled lab setting. Neither group could detect when they were actually being exposed to EMF, and both groups showed identical biological responses whether exposed to real or fake radiation. The study found no evidence that people with electromagnetic hypersensitivity react differently to cell tower emissions than healthy controls.
Mousavy SJ et al. · 2009
Researchers investigated the effect of mobile phone RF (910 MHz and 940 MHz) on the structure and function of HbA. Oxygen affinity was measured using sodium dithionite with a UV-vis spectrophotometer, and structural changes were studied by circular dichroism and fluorescence spectroscopy. The results indicated that mobile phone EMFs altered oxygen affinity and tertiary structure of HbA. Furthermore, the decrease of oxygen affinity of HbA corresponded to the EMFs intensity and time of exposure.
Naziroğlu M, Gümral N. · 2009
Researchers divided thirty rats into five groups to study the effects of 2.45 GHz electromagnetic radiation on the brain's antioxidant system and EEG records. Exposed rats received 2.45 GHz electromagnetic radiation for 60 minutes per day for 28 days, after which EEG records and brain cortex samples were collected. Brain cortex concentrations of vitamin A, vitamin C, and vitamin E were lower in the exposed group than in controls, though these concentrations were increased by selenium and L-carnitine supplementation. L-carnitine appeared to have a more protective effect on vitamin concentrations than selenium.
Naziroğlu M, Gümral N. · 2009
Researchers exposed rats to 2.45 GHz radiation (the same frequency used in WiFi and microwaves) for one hour daily over 28 days and found it depleted protective antioxidant vitamins in brain tissue. When rats were given selenium or L-carnitine supplements, these nutrients helped protect against the radiation-induced vitamin depletion. This suggests that WiFi-frequency radiation creates oxidative stress in the brain that may be partially countered by certain antioxidant supplements.
Naziroğlu M, Gümral N · 2009
Turkish researchers exposed rats to WiFi-frequency radiation (2.45 GHz) for one hour daily over 28 days and found it depleted key brain antioxidants including vitamins A, C, and E. When rats were given selenium or L-carnitine supplements during exposure, these protective nutrients were largely restored, with L-carnitine showing stronger protective effects. This suggests that wireless device radiation creates oxidative stress in brain tissue, but certain antioxidants may help counteract this damage.
Cook CM, Saucier DM, Thomas AW, Prato FS. · 2009
Researchers exposed 32 human subjects to two different pulsed magnetic field sequences that differed in presentation rate, to examine effects on the alpha frequency of the human EEG. Alpha activity was lowered over occipital-parietal regions during Sequence 1 exposure, while alpha activity over the same regions was higher after Sequence 2 exposure. These effects occurred after approximately 5 minutes of pulsed magnetic field exposure.
Wiholm C et al. · 2009
Researchers studied the effects of a 2 1/2 h RF exposure at 884 MHz on spatial memory and learning using a double-blind repeated measures design. The exposure was designed to mimic that experienced during a real-life mobile phone conversation, with an average peak spatial specific absorption rate of 1.4 W/kg. Results showed a significant RF exposure by group effect on distance traveled during the trials, with the symptomatic group improving their performance during RF exposure while there was no such effect in the non-symptomatic group.
Wiholm C et al. · 2009
Researchers exposed participants to mobile phone radiation at 1.4 W/kg (similar to real phone use) for 2.5 hours while they performed spatial memory tasks on a computer. Surprisingly, people who reported symptoms from phone use actually performed better during radiation exposure, while those without symptoms showed no change. This unexpected finding challenges assumptions about how phone radiation affects brain function.
