to replicate Lai and Singh's reports of DNA damage
Drs. Lai and
Singh (1995, 1996) reported that 2450 MHz microwaves induced DNA
damage (single- and double-strand breaks) in the brain cells of
exposed rats. Researchers from Dr Roti Roti's laboratory in Washington
University, St Louis, Missouri, have published results from two
recent studies that are in contrast to those by Drs. Lai and Singh.
In the first
paper, Lagroye and colleagues did in vitro experiments to try to
determine whether the results obtained by Lai and Singh, but not
by others, could be related to a particular step in the assay the
Lai and Singh used. They found no difference in the results whether
or not this step was included - and no evidence of DNA damage from
the radiofrequency radiation (RFR).
In the second
study rats were exposed to the microwaves in the same way that Lai
and Singh had done. Lagroye and colleagues examined the rats' brain
cells for signs of DNA damage, using the assay described by Lai
and Singh - but in an ancillary experiment they also used various
modifications of this assay. Again, there was no evidence of DNA
damage from the RFR, no matter which assay method was employed.
Lagroye I, Hook GJ, Wettring BA, Baty JD, et al. Measurements of
alkali-labile DNA damage and protein-DNA crosslinks after 2450 MHz
microwave and low-dose gamma irradiation in vitro. Radiat Res 2004
Anane R, Wettring BA, Moros EG, et al. Measurements of DNA damage
after acute exposure to pulsed-wave 2450 MHz microwaves in rat brain
cells by two alkaline comet assay methods. Int J Radiat Biol 2004
of EEG studies
James Lin, in
the latest of a series of articles in Radio Science Bulletin on
radiofrequency radiation safety and health, examines the electroencephalogram
(EEG) and mobile phone radiation. He reviews the basic physiology
of the nervous system, discusses the various EEG patterns that can
be seen, and outlines some of the studies that have been done in
subjects exposed to radiofrequency radiation from cell phones. The
article can be found at www.ursi.org
Lin JC. Human electroencephalograms (EEG) and mobile phone radiation.
Radio Science Bulletin 2004;308:52-54.
of a review of health risks of EM fields
R Habash and
colleagues have published a review of the health risks of electromagnetic
fields. The review is in two parts. The first deals with electric
and magnetic fields, and the second with radio frequency radiation.
The authors state in their summary:
the existing evidence for a causal relationship between RFR and
adverse health effects is limited. Additional research is needed
to clarify possible associations between RFR and biological effects
noted in some studies. Particular attention should be paid to
long-term, low-level exposure to RFR".
Habash is at
the McLaughlin Centre for Population Health Risk at the University
Habash RWY, Brodsky LM, Leiss W, Krewski D, Repacholi M. Health
risks of electromagnetic fields. Part II: Evaluation and assessment
of radio frequency radiation. Crit Rev Biomed Eng 2003;31:197-254.
recommends adoption of international guidelines in UK
Radiation Protection Board has recommended that the UK adopt the
guidelines of the International Commission on Non-Ionizing Radiation
Protection (ICNIRP) for limiting exposure to electromagnetic fields
(EMFs) between 0-300 GHz. In 1993 NRPB published exposure guidelines
that recommended the same limitations for those with occupational
exposure to EMFs and for members of the general public. They now
are recommending the two-tier system of ICNIRP, in which there are
one set of guidelines for occupational exposure and a more restrictive
set for the general public.
The report can
be read at http://www.nrpb.org/publications/documents_of_nrpb/abstracts/absd15-2.htm