More studies examine the blood-brain barrier
recent studies have explored the effect of radiofrequency radiation
(RFR) on the blood-brain barrier (BBB). Nylund and Leszczynski exposed
human endothelial cells
to 900 MHz RFR for 1 hour, and reported that this altered the amount
of proteins that are used in the supporting structure of cells.
They hypothesize that this could have an effect on the BBB.
Kuribayashi and colleagues, however, could not find any evidence
of disruption of the blood-brain barrier in young rats after exposure
to RFR at 1439 MHz frequency for 90 minute a day, six days per week,
for 1 or 2 weeks.
and colleagues previously reported that RFR exposure increased sucrose
permeability after exposure of cell cultures to a GSM 1800 field
(Schirmacher, 2000). In the present experiment they altered the
cell cultures and improved tightness of the blood-brain barrier,
so that "barrier properties ...come very close to the low in
vivo permeability". They could not find any evidence of increased
permeability of the BBB. In another report the same group of authors
tested the BBB with a UTMS signal, and again could not find any
evidence of increased permeability.
more, see "Research - Toxicological
Experiments - brain function".
Nylund R, Leszczynski D (2004): Proteomics analysis of human endothelial
cell line EA.hy926 after exposure to GSM 900 radiation. Proteomics
M, Wang J, Fujiwara O, Doi Y, et al. (2005): Lack of effects of
1439 MHz electromagnetic near field exposure on the blood-brain
barrier in immature and young rats. Bioelectromagnetics, 26:578-588.
H, Ringelstein EB, Stogbauer F (2005a): Electromagnetic fields (GSM
1800) do not alter blood-brain barrier permeability to sucrose in
models in vitro with high barrier tightness. Bioelectromagnetics
H, Streckert J, Bitz A, Goeke J, et al. (2005b): Effects of universal
mobile telecommunications system (UTMS) electromagnetic fields on
the blood-brain barrier in vitro. Radiation Research 164:259-269.
RFR exposure does not contribute to ear warmth
during a phone call
Some cell phone users have complained warmth in the region of the
ear during a call.
Straume (2005) found that the temperature increases to the external
ear that occur during a cell phone call are due to the insulation
effect of the phone and the electrical power dissipation. Radiofrequency
exposure did not contribute significantly to the temperature increase.
more, see "Research- Clinical
- experiments - others - temperature control".
Straume A, Oftedal G, Johnsson A (2005): Skin temperature increase
caused by a mobile phone: A methodological infrared camera study.
Correspondence on the radial arm maze studies
a recent issue of "Bioelectromagnetics", there are responses
by Jauchem and by Cassel to a letter from Lai that criticized attempts
to replicate his 1994 study on the effects of electromagnetic fields
on rats' performance in a radial arm maze. Lai offers a further
Jauchem JR. Letter to the Editor concerning Lai's letter on "Radial
arm maze performance of rats following repeated low level microwave
radiation exposure" (Bioelectromagnetics 25:49-57 (2004)).
Cassel J-C. Letter to the Editor concerning "Radial arm maze
performance of rats following repeated low level microwave radiation
exposure", by Cobb et al. (BEMS, 2004, 25:49-57) and "Letter
to the Editor" by Lai (BEMS, 2005, 26:81). Bioelectromagnetics,
Lai H. Response to Jauchem and Cassels. Bioelectromagnetics 2005;26:528.