study on cell phones and cancer
month we reported that a Swedish study showed no association between
use of cell phones and brain cancer. Now a Danish study, also part
of the large-scale INTERPHONE study, has reported similar findings.
The authors studied 252 people with glioma
and 175 with meningioma,
and compared their cell phone use with control persons who did not
have the disease. They found no association between phone use and
an increased risk of brain tumour.
more, see "Research - Epidemiology".
Christensen HC, Schuz J, Kosteljanetz M, Skovgaard Poulsen H, et
Cellular telephones and risk for brain tumours: A population-based,
incident case-control study. Neurology 64:1189-1195.
study shows no effect of long-term EMF on animal cancer
studies have shown no effect of electromagnetic field (EMF) exposure
on cancer development in animals. The latest study, by Sommer and
colleagues, used a strain of mice susceptible to a type of lymphoma.
The mice were exposed for 24 hours per day, 7 days a week, for almost
a year, at a whole-body SAR of 0.4 W/kg. There was no effect on
survival rate in the exposed group, compared with a sham exposed,
although both groups had a very high mortality rate from lymphoma,
and it may have been difficult to show a difference.
more, see "Research - Toxicological
Experiments - cancer studies".
Sommer AM, Streckert J, Bitz AK, Hansen VW, et al. (2004): No effects
of GSM-modulated 900 MHz electromagnetic fields on survival rate
and spontaneous development of lymphoma in female AKR/J mice. BMC
Cancer 2004;4:77. Published online November 11, 2004.
of EMFs on plant growth
have been only a few investigations on the effect of radiofrequency
radiation (RFR) on plant growth. A recent study examined the effect
of fields at frequencies of 400, 900, and 1900 MHz, at different
field strengths, on duckweed (Lemna minor). The authors found that
plant growth was decreased in several different situations.
Tkalec M, Malaric K, Pevalek-Kozlina B (2005): Influence of 400,
900, and 1900 MHz electromagnetic fields on Lemna minor growth and
peroxidase activity. Bioelectromagnetics 26:185-193.
produce stress-like response in lymphocytes
and colleagues investigated the response of lymphocytes from healthy
subjects and from persons reporting hypersensitivity to EMFs. They
found that the EMFs did not produce cell death, but did show other
changes that were similar to those seen with the stress response.
The lymphocytes from the healthy and hypersensitive donors showed
more, see "Research -Toxicological
Experiments - Others - apoptosis".
Belyaev IY, Hillert L, Protopopova M, Tamm C, et al. 915 MHz microwaves
and 50 Hz magnetic field affect chromatin conformation and 53 BPI
foci in human lymphocytes from hypersensitive and healthy persons.
and improved design of the TEM cell
1997 Penafiel and colleagues published a paper describing an increase
in ornithine decarboxylase (ODC) activity in mouse fibroblasts after
exposure to pulsed radiofrequency fields from a TDMA system operating
at 835 MHz. ODC activity is increased in the unregulated growth
of tumour cells. In view of the importance of this study, the WHO
recommended its replication, and this is planned as part of European
Project PERFORM B.
and colleagues have reevaluated the TEM cell system, which is an
integral part of Penafiel's experiment. They found that the results
they obtained for SAR and temperature measurements did not correspond
with those of Penafiel and colleagues. Nikoloski et al. recommended
several design changes in the TEM cell that led to consistent results
for SAR values and temperature control.
Nikoloski N, Frohlich J, Samaras T, Schuderer J, Kuster N (2005):
Reevaluation and improved design of the TEM cell in vitro exposure
unit for replication studies. Bioelectromagnetics 26:215-224.
Experiments test the effect of the precautionary
authors of a recent publication define the " precautionary
principle" as one that "recommends that action should
be taken to prevent serious potential harm, regardless of scientific
uncertainty as to the likelihood, magnitude, or cause of that harm".
This subject has been discussed in "What's
New" in November '01, April '02,
and August '03. Wiedemann and Schutz
carried out two experiments that "indicate that precautionary
measures may trigger concerns, amplify EMF-related risk perceptions,
and lower trust in public health protection".
Wiedemann PM, Schutz H. The precautionary principle and risk perception:
experimental studies in the EMF area. Environ Health Perspect 2005;113:402-5.