Wednesday, April 27, 2011

How Bacteria Could Generate Radio waves

Can bacteria generate radio waves?

On the face of it, this seems an unlikely proposition. Natural sources of radio waves include lightning, stars and pulsars while artificial sources include radar, mobile phones and computers. This is a diverse list. So it's hard to see what these things might have in common with bacteria that could be responsible for making radio waves.

But today, Allan Widom at Northeastern University in Boston and a few pals, say they've worked out how it could be done.

They point out that many types of bacterial DNA take the form of circular loops. So they've modelled the behaviour of free electrons moving around such a small loop, pointing out that, as quantum objects, the electrons can take certain energy levels.

Widom and co calculate that the transition frequencies between these energy levels correspond to radio signals broadcast at 0.5, 1 and 1.5 kilohertz. And they point out that exactly this kind of signal has been measured in E Coli bacteria.

Let's make one thing clear: this is a controversial area of science. The measurements of bacterial radio waves were published in 2009 by Luc Montagnier, who won the Nobel Prize for medicine in 2008 for the discovery of HIV. However, Montagnier is a controversial figure and it's fair to say that his claims are not accepted by most mainstream biologists.

However, one of the criticisms of the work was that there is no known mechanism by which bacteria can generate radio waves. That criticism may now no longer hold.

That means Widom and co may be able to kickstart more work in this area. It is well known that bacterial and other types of cells use electromagnetic waves at higher frequencies to communicate as well as to send and store energy. If cells can also generate radio waves, there's no reason to think they wouldn't exploit this avenue too.

via How Bacteria Could Generate Radio waves - Technology Review.

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