New doubts raised over mobile phone safety - Telegraph
Extract:
"Just five minutes of exposure to mobile phone emissions can trigger changes that occur during cancer development, according to new research.
Scientists found mobile signals can activate cell division – central to the growth of tumours - even at very low power levels.
Government guidance that mobile phone use is safe is based on the mainstream scientific assumption that electromagnetic radiation from devices such as mobiles could only cause health hazards as a result of heating.
The new research, highlighted in this week’s New Scientist, supports the position of some researchers who argue handsets can trigger potentially harmful changes to cells irrespective of temperature changes.
However other scientists said cell division is a natural process that occurs constantly in the body and does not usually signify health hazards.
Graham Philips, of the campaign group Powerwatch, said: "Current safety guidelines assume health effects from mobiles can only occur when significant heating of body tissue occurs.
"This study shows biological changes in response to low level mobile phone radiation - something that could potentially have implications for health.
"Further research is required, however guidance based purely on thermal effects is clearly out of date."
Prof Rony Seger, a cancer researcher at the Weizmann Institute of Science in Rehovot, Israel, and colleagues exposed rat and human cells to electromagnetic radiation at a similar frequency to that emitted by mobiles. The power of the signal was around 1/10th of that from a mobile.
After just five minutes the researchers identified the production of extracellular signal-regulated kinases (ERK1/2) – natural chemicals that stimulate cell division and growth.
Cancers develop when the body is unable to prevent excessive growth and division of cells in the wrong place.
Prof Seger said: "The real significance of our findings is that cells are not inert to non-thermal mobile phone radiation."
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Wednesday, 29 August 2007
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