Research:
Lund U. Study on Blood-Brain-Barrier
Effects of EMF Exposure:

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Posted:
26 October 1999

---------- Forwarded message ----------
Date: Fri, 24 Sep 1999 18:21:20 -0500 (CDT)
From: "Roy L. Beavers" <rbeavers@llion.org>
To: emfguru <rbeavers@llion.org>
Subject: Lund U. study on blood-brain-barrier effects of
EMF exposure...(fwd)

......Our man in Sweden has forwarded the following. It provides many more details on the Lund University study.....

Roy Beavers (EMFguru)......
roy@emfguru.com.......

---------- Forwarded message ----------
Date: 24 Sep 99 23:52:43 MET DST

To: Roy Beavers <rbeavers@llion.org>
Subject: more info on the Lund study

Hi. Some of the reseach by the team from The University of Lund have been published in:

Wireless Networks 3 (1997) 6
Exposure Hazards and Health Protection in Personal Communication Services
Guest Editors: Paolo Bernardi and James C. Lin



The link to this issue is:
http://www.baltzer.nl/winet/contents/3-6.html

Paolo Bernardi and James C. Lin Editorial: Exposure Hazards and Health Protection in Personal Communication Services 435-437

James C. Lin Biological aspects of mobile communication fields 439-453 Bertil R.R. Persson, Leif G. Salford and Arne Brun Blood-brain barrier permeability in rats exposed to electromagnetic fields used in wireless communication 455-461

Leif G. Salford, Arne Brun and Bertil R.R. Persson Brain tumour development in rats exposed to electromagnetic fields used in wireless cellular communication 463-469

Henry Lai, Monserrat Carino and Narendra Singh Naltrexone blocks RFR-induced DNA double strand breaks in rat brain cells 471-476

B. Bianco, A. Chiabrera, E. Moggia and T. Tommasi Enhancement of the interaction between low-intensity R.F. e.m. fields and ligand binding due to cell basal metabolism 477-487

Gert Frølund Pedersen Amplitude modulated RF fields stemming from a GSM/DCS-1800 phone 489-498

Graziano Cerri, Roberto De Leo and Giacomo Rosellini Evaluation of electromagnetic power deposition in a spherical multilayer head in the near field of a linear antenna 499-510

P. Bernardi, M. Cavagnaro and S. Pisa Assessment of the potential risk for humans exposed to millimeter-wave wireless LANs: the power absorbed in the eye 511-517


Below is the abstract of the report that was (part of) the basis for the newpaper article in "Svenska Dagbladet". The full report is available in PDF for subscribers, librarians, etc. You probably know someone who could download and print it out for you.


Blood-brain barrier permeability in rats exposed to electromagnetic fields used in wireless communication

Bertil R.R. Persson Leif G. Salford Arne Brun

Lund University, S-221 85 Lund, Sweden

Biological effects of radio frequency electromagnetic fields (EMF) on the blood-brain barrier (BBB) have been studied in Fischer 344 rats of both sexes.

The rats were not anaesthetised during the exposure. All animals were sacrificed by perfusion--fixation of the brains under chloralhydrate anaesthesia after the exposure. The brains were perfused with saline for 3--4 minutes, and thereafter perfusion fixed with 4% formaldehyde for 5--6 minutes. Whole coronal sections of the brains were dehydrated and embedded in paraffin and sectioned at 5 µm. Albumin and fibrinogen were demonstrated immunohistochemically and classified as normal versus pathological leakage.

In the present investigation we exposed male and female Fischer 344 rats in a Transverse Electromagnetic Transmission line chamber to microwaves of 915 MHz as continuous wave (CW) and pulse-modulated with different pulse power and at various time intervals.

The CW-pulse power varied from 0.001 W to 10 W and the exposure time from 2 min to 960 min. In each experiment we exposed 4--6 rats with 2--4 controls randomly placed in excited and non-excited TEM-cells respectively.

We have in total investigated 630 exposed rats at various modulation frequencies and 372 controls. The frequency of pathological rats is significantly increased (p<0.0001) from 62/372 (ratio: 0.17± 0.02) for control rats to 244/630 (ratio: 0.39± 0.03) in all exposed rats.

Grouping the exposed animals according to the level of specific absorbed energy (J/kg) give significant difference in all levels above 1.5 J/kg. The exposure was 915 MHz microwaves either pulse modulated (PW) at 217 Hz with 0.57 ms pulse width, at 50 Hz with 6.6 ms pulse width or continuous wave (CW).

The frequency of pathological rats (0.17) among controls in the various groups is not significantly different. The frequency of pathological rats was 170/481 (0.35± 0.03) among rats exposed to pulse modulated (PW) and 74/149 (0.50±0.07) among rats exposed to continuous wave exposure (CW).

These results are both highly significantly different to their corresponding controls (p<0.0001) and the frequency of pathological rats after exposure to pulsed radiation (PW) is significantly less (p<0.002) than after exposure to continuous radiation (CW).


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