Speit G, Schütz P, Hoffmann H. · 2007
German researchers attempted to replicate the controversial REFLEX study findings that showed cell phone radiation (1800 MHz) could damage DNA in human cells. Using identical equipment, cells, and exposure conditions, they found no DNA damage whatsoever. This directly contradicted the original REFLEX results that had suggested radiofrequency radiation at levels similar to cell phones could be genotoxic (DNA-damaging).
Guney M, Ozguner F, Oral B, Karahan N, Mungan T. · 2007
Rats were randomly assigned to four groups of eight each, including a control, a sham, a 900 MHz EMR exposure group, and an EMR plus vitamins E and C group, and the EMR groups received 30 minutes per day for 30 days. EMR exposure increased endometrial nitric oxide and malondialdehyde levels and decreased superoxide dismutase, catalase, and glutathione peroxidase activities, while combined vitamins E and C reversed these changes. The EMR group showed diffuse severe apoptosis in endometrial epithelial, glandular, and stromal cells and diffuse eosinophilic leucocyte and lymphocyte infiltration, which were significantly reduced by vitamins E and C.
Unknown authors · 2007
Researchers measured radiofrequency fields from wireless local area networks using Wi-Fi technology against background RF fields in the frequency range 75 MHz to 3 GHz. They conducted 356 measurements at 55 sites including residences, commercial spaces, healthcare and educational institutions, and other public spaces in the U.S., France, Germany, and Sweden. Measurements were taken under conditions that would result in the higher end of exposures, including close to Wi-Fi access points and at a distance of approximately 1 m from a laptop uploading and downloading large files. In all cases, measured Wi-Fi signal levels were very far below international exposure limits (IEEE C95.1-2005 and ICNIRP) and in nearly all cases far below other RF signals in the same environments.
Vecchio F et al. · 2007
Ten subjects underwent two EEG recordings separated by one week in a crossover double-blind paradigm. The mobile phone was held on the left side of the head by a modified helmet. Each session lasted 45 minutes with real GSM exposure in one session and sham in the other. GSM stimulation modulated interhemispheric frontal and temporal coherence at alpha2 and alpha3 bands compared to sham.
Joubert V, Leveque P, Cueille M, Bourthoumieu S, Yardin C. · 2007
French researchers exposed rat brain neurons to cell phone radiation (900 MHz GSM) for 24 hours at levels similar to phone use (0.25 W/kg SAR) to see if it would cause cell death (apoptosis). Using three different testing methods, they found no increase in neuron death compared to unexposed control cells. This suggests that short-term cell phone radiation exposure may not directly kill brain cells under these laboratory conditions.
Krause CM, Pesonen M, Haarala Björnberg C, Hämäläinen H. · 2007
Finnish researchers exposed 72 men to 902 MHz mobile phone radiation while they performed memory tasks, measuring brain wave patterns through EEG. The study found only modest, inconsistent effects on brain oscillations in the alpha frequency range, with no impact on actual memory performance. The researchers concluded that any brain wave changes from phone radiation appear to be subtle, variable, and difficult to replicate consistently.
Brillaud E, Piotrowski A, de Seze R. · 2007
French researchers exposed rats to cell phone radiation (900MHz GSM signal) for just 15 minutes and then examined their brains over the following 10 days. They found significant increases in glial cell activity (brain cells that support and protect neurons) in multiple brain regions, peaking 2-3 days after exposure. This glial response indicates the brain was reacting to the radiation exposure as if responding to injury or stress.
Haarala C et al. · 2007
Researchers studied the effects of continuous wave and pulsed wave electromagnetic fields on cognitive function in 36 healthy male subjects. Subjects performed cognitive tasks during exposure to continuous wave, pulsed wave, and sham fields, with left- and right-sided exposure in a double-blind design. No effects were found between EMF conditions, hemisphere exposures, or between the control and experimental groups.
Ribeiro EP, Rhoden EL, Horn MM, Rhoden C, Lima LP, Toniolo L · 2007
Researchers randomly divided 16 male Wistar rats into experimental and control groups; the experimental group was exposed to GSM radiofrequency (1,835–1,850 MHz) for 1 hour daily over 11 weeks. They measured rectal temperature, testicular and epididymal weight, lipid peroxidation, serum testosterone, sperm count, and histopathological endpoints. No statistically significant differences were found between exposed and control groups in any measured endpoint.
Dimbylow P. · 2007
Researchers used finite-difference time-domain calculations to estimate SAR from 20 MHz to 3 GHz in hybrid voxel-mathematical models of the pregnant female. Mathematical models of the developing foetus at 8-, 13-, 26- and 38-week gestation were converted into voxels and combined with the reference adult female model, NAOMI at a resolution of 2 mm. The study calculated the electric field values needed to produce the ICNIRP public exposure restriction of 2 W kg(-1) when averaged over 10 g of the foetus.
Oberto G et al. · 2007
Researchers conducted an 18-month carcinogenicity study in Pim1 transgenic mice exposed to pulsed 900 MHz RF radiation at whole-body SAR levels of 0.5, 1.4, or 4.0 W/kg. A total of 500 mice, 50 per sex per group, were exposed, sham-exposed, or used as cage controls, and the study was conducted blind. The study found no effect of the RF radiation on tumor incidence at any site and did not confirm the earlier report of increased lymphomas in Repacholi et al.
Parazzini M et al. · 2007
Researchers exposed 26 healthy young volunteers to 900 MHz GSM phone radiation and sham exposure in separate double-blind sessions. A rest-to-stand protocol assessed autonomic nervous system function during rest and after sympathetic activation. No statistically significant effect of EMF exposure was found on the main RR mean or most other heart rate variability parameters. A weak interaction between some time and frequency domain HRV parameters and RF exposure was observed around the sympathetic response to standing.
Parazzini M et al. · 2007
Italian researchers exposed 26 healthy young adults to cell phone radiation at 900 MHz (2 watts) while measuring heart rate variability, which reflects how well the autonomic nervous system regulates heart rhythm. The study found no statistically significant effects on heart rate patterns during either rest or physical stress, though some minor changes were detected in a few measurements. This suggests that short-term cell phone exposure at typical power levels doesn't meaningfully disrupt the body's automatic control of heart function.
Zeni et al. · 2007
Researchers investigated whether 900 MHz RF radiation could induce reactive oxygen species in murine L929 fibrosarcoma cells, with or without co-exposure to MX, a potent environmental carcinogen produced during chlorination of drinking water. Both continuous-wave and GSM mobile phone signals were applied for 10 or 30 min at specific absorption rates of 0.3 and 1 W/kg. The study found no indication that RF-field exposure, alone or combined with MX, induced reactive oxygen species formation, while MX alone caused a statistically significant increase in reactive oxygen species for all the treatment durations investigated.
Zeni O et al. · 2007
Researchers exposed mouse cells to 900 MHz cell phone radiation for up to 30 minutes to test whether it creates harmful reactive oxygen species that damage cells. The study found no increase in these damaging molecules from RF exposure alone, suggesting this frequency may not cause oxidative cellular stress.
Panagopoulos DJ et al. · 2007
Researchers used Drosophila melanogaster reproductive capacity to compare the biological activity of GSM 900 MHz and DCS 1800 MHz radiation. Both radiation types significantly reduced reproductive capacity in a non-thermal manner. GSM 900 MHz radiation appeared more bioactive than DCS 1800 MHz, a difference attributed mostly to field intensity and less to carrier frequency.
Stefanics G et al. · 2007
Each participant underwent a 10-minute exposure to 900 MHz pulsed EMF from a commercial Nokia 6310 mobile phone. Fifteen participants received genuine EMF exposure and fifteen received sham exposure in a double-blind, counterbalanced order. No significant differences were found in the latency of ABR waves I, III, and V before and after either genuine or sham exposure. The authors suggest that, in their experimental conditions, a single 10-minute exposure to 900 MHz EMF from a commercial mobile phone does not produce measurable immediate effects on the latency of auditory brainstem waves I, III and V.
Stefanics G et al. · 2007
Researchers exposed 30 healthy young adults to 10 minutes of 900 MHz radiation from a Nokia cell phone and measured their auditory brainstem response (ABR), which tracks how sound signals travel from the ear to the brain. They found no immediate changes in ABR timing compared to sham exposure. This suggests short-term cell phone use doesn't immediately disrupt the basic hearing pathway in the brainstem.
Unknown authors · 2007
Researchers exposed murine L929 fibroblasts, rat C6 glioblastoma cells, human SH-SY5Y neuroblastoma cells, and rat primary astrocytes to 872 MHz RF radiation. Cells were exposed for 2, 8, or 24 hours to continuous wave or GSM-modulated signals at specific absorption rates of 1.5, 2.5, or 6.0 W/kg. ODC activity in rat primary astrocytes decreased significantly at 1.5 and 6.0 W/kg with both signal types. Secondary cell lines showed generally no change in ODC activity.
Unknown authors · 2007
Finnish researchers exposed brain cells to 872 MHz radiofrequency radiation (similar to cell phone frequencies) and found that a key enzyme called ornithine decarboxylase was significantly reduced in primary astrocytes (natural brain cells). Importantly, this effect didn't occur in laboratory-grown cell lines, suggesting that natural brain cells may be more vulnerable to RF radiation than artificial cell cultures used in many studies.
Hirose H et al. · 2007
Researchers performed an in vitro study of low-level RF fields from IMT-2000 base stations to test if modulated signals cause hsp27 phosphorylation and overexpression. No significant differences in phosphorylated hsp27 at serine 82 or in hsp gene expression were found between exposed and sham-exposed groups.
Hirose H et al. · 2007
Japanese researchers exposed human brain and lung cells to radiofrequency radiation at levels similar to cell tower emissions (2.1 GHz) for up to 48 hours. They found no changes in heat shock proteins (cellular stress markers that increase when cells are damaged) even at exposure levels 10 times higher than public safety limits. This suggests that cell tower-level RF radiation does not trigger detectable cellular stress responses in laboratory conditions.
Unknown authors · 2007
The paper discusses the phenomenon, mechanism, power requirement, pressure amplitude, and auditory thresholds of microwave hearing. Microwave pulse hearing involves electromagnetic waves from hundreds of MHz to tens of GHz, unlike normal hearing which uses sound pressure waves. The microwave auditory effect does not come from direct interaction with auditory nerves but from a thermoelastic wave launched by pulse absorption in soft tissues. This thermoelastic wave travels by bone conduction to the inner ear and activates cochlear receptors like normal hearing. The paper emphasizes human exposures to wireless communication fields and MRI coils.
Unknown authors · 2007
This 2007 study explains how humans and animals can actually hear microwave pulses, a phenomenon where electromagnetic waves create audible sounds inside the head. The research shows that pulsed microwaves heat tissue, creating pressure waves that travel through bone to the inner ear, where they're perceived as clicking or buzzing sounds. This finding has important implications for understanding exposure to wireless devices and MRI equipment.
Platano D et al. · 2007
Researchers studied the non-thermal effects of radiofrequency electromagnetic fields on barium currents through voltage-gated calcium channels in primary cultures of rat cortical neurons using the patch-clamp technique. Neurons were exposed for one to three periods of 90 seconds to 900 MHz continuous wave or GSM-modulated signals during whole-cell recording at specific absorption rates of 2 W/kg for both modulation types. Single or multiple acute exposures to either continuous wave or GSM-modulated 900 MHz fields did not significantly alter the current amplitude or the current-voltage relationship through voltage-gated calcium channels.
