Malyapa RS et al. · 1997
Researchers exposed lab-grown cells to microwave radiation at 2450 MHz (the same frequency used in microwave ovens and older WiFi) for up to 24 hours to see if it would damage DNA. Using a highly sensitive test called the comet assay, they found no DNA damage at either exposure level tested. This contradicted earlier studies that suggested microwave radiation could break DNA strands in brain cells.
Ivaschuk OI et al. · 1997
Researchers exposed rat nerve cells to cell phone radiation at 836.55 MHz (the frequency used by early digital cell phones) to see if it would affect the activity of genes called c-fos and c-jun, which help control cell growth and responses to stress. They found mostly no effects, except for a 38% decrease in c-jun gene activity at the highest exposure level of 9 mW/cm². This suggests that cell phone radiation may have subtle effects on nerve cell gene expression, but only at relatively high exposure levels.
Stagg RB, Thomas WJ, Jones RA, Adey WR · 1997
Researchers exposed brain cells (both normal and cancerous glioma cells) to cell phone-like radiofrequency radiation at 836.55 MHz for 24 hours to see if it would promote tumor growth by affecting DNA synthesis. While they found small increases in DNA activity in some cancer cell experiments, this didn't translate to actual increased cell growth or proliferation in either normal or cancerous cells.
Vijayalaxmi et al. · 1997
Researchers exposed cancer-prone mice to 2450 MHz radiofrequency radiation (the same frequency used in microwave ovens and some WiFi) for 20 hours daily over 18 months to test whether it causes DNA damage. They measured micronuclei - tiny fragments that indicate genetic damage - in blood and bone marrow cells. The study found no significant difference in DNA damage between exposed and unexposed mice, suggesting this level of RF exposure did not cause detectable genetic harm.
Unknown authors · 1997
Researchers in Taiwan studied 3,427 cancer cases to examine whether living near power lines increases cancer risk. They found that people exposed to magnetic fields above 0.2 microtesla had a 40% higher risk of leukemia, and those living within 50 meters of transmission lines faced double the leukemia risk. No increased risk was found for brain tumors or breast cancer.
Litovitz et al. · 1997
Researchers exposed cells to microwave radiation from cell phones and found it increased activity of an enzyme called ornithine decarboxylase, which is linked to cell growth and potentially cancer. However, when they added low-frequency electromagnetic 'noise' during the exposure, it completely blocked these cellular effects. This suggests that certain types of electromagnetic interference might actually protect cells from microwave damage.
Unknown authors · 1997
Finnish researchers studied 12,063 people living near high-voltage power lines and found that while general depression levels weren't affected, those living within 100 meters of transmission lines had a 4.7-fold increased risk of severe depression. The study tracked participants for 20 years and used standardized depression assessments.
Gos, P, Eicher, B, Kohli, J, Heyer, WD · 1997
Researchers exposed yeast cells (Saccharomyces cerevisiae) to extremely high frequency electromagnetic fields around 41.7 GHz at very low power levels to see if the radiation affected how quickly the cells divided. After careful testing with proper controls, they found no significant differences in cell division rates between exposed and unexposed yeast. This contradicts some earlier studies that claimed to find biological effects from similar EMF exposures.
Donnellan M, McKenzie DR, French PW · 1997
Researchers exposed immune cells called mast cells to 835 MHz radiofrequency radiation (similar to cell phone frequencies) for 20 minutes three times daily over a week. The exposed cells showed increased DNA synthesis, altered cell shape, and enhanced release of inflammatory substances compared to unexposed cells. These cellular changes persisted for at least a week after the radiation exposure ended, suggesting the effects may trigger lasting biological responses.
Donnellan M, McKenzie DR, French PW. · 1997
Researchers exposed immune cells called mast cells to cell phone radiation at 835 MHz for 20 minutes, three times daily for a week. They found that starting on day four, the cells began growing faster, changed shape, and became more reactive to chemical triggers. What's particularly concerning is that these changes persisted for at least a week after the radiation exposure ended, suggesting the effects may be long-lasting.
Jensh RP · 1997
Pregnant rats exposed to microwave radiation at cell phone and microwave oven frequencies showed concerning effects in offspring. The highest frequency (6000 MHz) caused delayed development, reduced birth weight, and altered brain function, suggesting certain microwave frequencies may affect developing brains.
Unknown authors · 1997
FDA researchers exposed human T-lymphocyte immune cells to 60 Hz magnetic fields at 0.15 mT (1,500 times stronger than typical household levels) to test whether power line frequencies affect cellular calcium signaling. The study found no changes in intracellular calcium responses under both optimal and stressed cell conditions. However, researchers noted this doesn't rule out effects on other calcium-dependent processes deeper in the cellular pathway.
Unknown authors · 1997
Researchers studied 540 adults living near high-voltage power lines, measuring magnetic field exposure in their homes and testing their psychological health. They found that higher magnetic field exposure was linked to worse performance on coding tests and increased psychiatric symptoms, even after accounting for other factors.
Unknown authors · 1997
Researchers exposed rat tracheal cells to gamma radiation alone or combined with 50 Hz electromagnetic fields at 100 microtesla. While EMF alone caused no DNA damage, cells exposed to both gamma radiation and EMF showed significantly more genetic damage than radiation alone. This suggests power frequency fields may amplify cancer-causing effects of other radiation sources.
Vijayalaxmi, Mohan, N, Meltz, ML, Wittler, MA, · 1997
Researchers exposed human blood cells to microwave radiation at 2450 MHz (the same frequency used in microwave ovens and WiFi) for 90 minutes to see if it would damage DNA or affect cell growth. They found no genetic damage, chromosome breaks, or changes in how fast the cells multiplied compared to unexposed cells. This suggests that short-term exposure to this type of radiation at these power levels may not immediately harm human blood cells.
Vollrath L, Spessert R, Kratzsch T, Keiner M, Hollmann H · 1997
German researchers exposed rats and hamsters to 900 MHz radio frequency fields (similar to early cell phones) for up to 6 hours to see if it would affect their pineal glands, which produce the sleep hormone melatonin. They found no changes in melatonin production or pineal gland structure at any exposure level tested. This suggests that short-term RF exposure at these levels doesn't disrupt the body's natural sleep-wake cycle regulation.
Unknown authors · 1997
Researchers exposed human blood cells to 2450 MHz radiofrequency radiation (microwave oven frequency) for 90 minutes and found no genetic damage or changes in cell division. The study tested both continuous and intermittent exposure patterns at power levels similar to some industrial microwave applications.
Vorobyov VV, Galchenko AA, Kukushkin NI, Akoev IG · 1997
Russian scientists exposed rats to weak cell phone-like radiation (945 MHz) for 10 minutes and found immediate changes in brain wave patterns between left and right brain hemispheres within 20 seconds. This suggests microwave radiation can directly interfere with normal brain electrical activity.
Salford LG, Brun A, Persson BRR · 1997
Researchers injected brain tumor cells into 154 pairs of rats, then exposed half to 915 MHz microwaves (the frequency used by early cell phones) for 7 hours daily over 2-3 weeks while keeping the other half as controls. They found no difference in tumor growth between exposed and unexposed rats, suggesting that microwave exposure did not accelerate existing brain tumors in this particular experimental setup.
Nakamura H, Seto T, Nagase H, Yoshida M, Dan S, Ogino K. · 1997
Japanese researchers exposed pregnant and non-pregnant rats to microwave radiation at 2450 MHz (the same frequency used by microwave ovens and WiFi) for 90 minutes at 10 mW/cm². They found that pregnant rats showed significant immune system suppression, with reduced natural killer cell activity in the spleen, while non-pregnant rats showed no immune changes. The study reveals that pregnancy makes organisms more vulnerable to microwave radiation effects.
Klug S, Hetscher M, Giles S, Kohlsmann S, Kramer K, · 1997
German researchers exposed developing rat embryos to radio frequency electromagnetic fields at various power levels for up to 36 hours to test whether EMF exposure during critical development stages causes birth defects or growth problems. The study found no significant effects on embryo development, growth, or cellular structure across all tested exposure levels, including levels far exceeding typical telecommunication device emissions. This suggests that RF fields at these intensities may not pose developmental risks during embryonic growth.
Lai H, Carino MA, Singh NP · 1997
Researchers exposed rats to microwave radiation at 2.45 GHz for 2 hours and found significant DNA double strand breaks in brain cells. When they gave rats naltrexone (a drug that blocks the body's natural opioids), it partially prevented the DNA damage. This suggests that microwave radiation triggers the body's opioid system, which then contributes to genetic damage in brain tissue.
Lai, H, Carino, MA, Singh, NP, · 1997
Researchers exposed rats to 2.45 GHz microwave radiation (the same frequency used in WiFi and microwave ovens) for 2 hours and found it caused DNA double strand breaks in brain cells. When they gave the rats naltrexone, a drug that blocks the body's natural opioids, it partially prevented this DNA damage. This suggests the body's own opioid system plays a role in how microwave radiation damages DNA in brain cells.
Unknown authors · 1997
This 1997 meta-analysis examined multiple studies on leukemia risk for people living near high-voltage power lines (49 kV and above). Researchers found a 30% increased leukemia risk for magnetic field exposures at 2 milligauss or higher, with risk increasing at higher exposure levels. The analysis included both adults and children living within 50 meters of transmission lines.
Ryan KL, Walters TJ, Tehrany MR, Lovelace JD, Jauchem JR · 1997
Researchers exposed rats of different ages to 35 GHz microwave radiation until death to study whether age affects how the body responds to microwave heating. They found that young, middle-aged, and older rats all showed identical patterns of rising body temperature and heart rate during exposure, with no age-related differences in survival time. This suggests that age doesn't change how mammals respond to intense microwave heating.
