finds no genotoxic effects from 900 MHz fields
Swiss study has failed to find any genotoxic
effects of RF fields on cells of the yeast Saccharomyces cerevisiae.
The authors used 900 MHz fields that closely matched the Global
System for Mobile Communication (GSM). Specific absorption rates
were 0.13 and 1.3 W/kg. Several different tests were performed,
and there was no evidence of increased mutation rates or genomic
Gos P, Eicher B, Kohli J, Heyer W-D. No mutagenic or recombinogenic
effects of mobile phone fields at 900 MHz detected in the yeast
Saccharomyces cerevisiae. Bioelectromagnetics 2000;21:515-523.
eye damage in monkeys from microwaves.
recent study examined the effects of 1.25 GHz high peak power microwaves
in Rhesus monkeys. The animals were exposed for 4 hours per day
and 3 days per week for 3 weeks. The authors examined the retina
of the monkeys using photographs, blood vessel dye studies, measurement
of electrical changes in the retina, and microscopical examination
of the eye tissues. Several microwave powers were used. The authors
stated that "retinal injury is very unlikely at 4W/kg. Functional
changes that occur at higher R-SAR are probably reversible".
Lu S-T, Mathur SP, Stuck B, Zwick H, et al. Effects of high peak
power microwaves on the retina of the Rhesus monkey. Bioelectromagnetics
study examines symptoms associated with cell phone use
and colleagues have published a paper on a 1995 study of mobile
phone users in Norway and Sweden. Of those who completed a questionnaire
asking about symptoms associated with mobile phone use, 31% in Norway
and 13% in Sweden reported experiencing at least one symptom. The
authors point out that this does not necessarily imply a causal
relationship between phone use and the symptom.
more details, see "Research
Oftedal G, Wilen J, Sandstrom M, Mild KH. Symptoms experienced in
connection with mobile phone use. Occup Med 2000;50:237-245.
Swiss study on EMF and EEG changes
"What's New" of February, 2000, we discussed a study from
the University of Zurich that showed that exposure to EMF during
sleep altered sleep onset latency and also EEG patterns (see also
"Health - Brain Function, Borbely et al.). The same group now
reports that exposure
to EMF before sleep affects EEG
patterns during subsequent sleep. A commentary in the same issue
of NeuroReport emphasises that the mechanisms for these changes
remain unclear, and that it has not been established that there
are any long-term effects on human brain function from EMF exposure.
more details, see "Research
- Clinical -EEG".
Huber R, Graf T, Cote KA, Wittman L, et al. Exposure to pulsed high-frequency
electromagnetic field during waking affects human sleep EEG. NeuroReport
M. Exposure to electromagnetic fields by using cellular telephones
and its influence on the brain. NeuroReport 11:3321-3325.