[ RadSafe ] DNA can be damaged by very low-energy radiation
parthasarathy k s
ksparth at yahoo.co.uk
Fri Mar 14 04:11:08 CDT 2014
Dear Dr.Roy Herren,
This EurekAlert news release is issued by Tata Institute Of Fundamental Research(TIFR), Mumbai. TIFR is considered to be the cradle of all nuclear energy developments in India.
I am unable to understand why the researchers did not publish the results in a peer journal before making it public. Am I missing something here?. Their discovery seems to be novel.The general impression is that such low energy photons are not energetic enough to create double strand breaks.
On Friday, 14 March 2014, 13:21, ROY HERREN <royherren2005 at yahoo.com> wrote:
PUBLIC RELEASE DATE:14-Mar-2014 Contact: Deepak Mathur
atmol1 at tifr.res.in
Tata Institute of Fundamental Research
DNA can be damaged by very low-energy radiation
How safe are 'eye-safe' lasers?
"Very low-energy radiation also damages DNA: how safe are "eye-safe" lasers?"
Damage to DNA by high energy radiation constitutes the most lethal
damage occurring at the cellular level. Surprisingly, very low-energy
interactions - with OH radicals, for instance - can also induce DNA
damage, including double strand breaks. It is known that single strand
breaks in the DNA backbone are amenable to repair but most double strand breaks are irreparable. The propensity with which slow OH radicals
damage DNA depends on their rotational energy: rotationally "hot" OH
is more proficient in causing double breaks. These novel findings are
from experiments conducted on DNA in a physiological environment.
Intense femtosecond laser pulses are propagated through water (in which
DNA plasmids are suspended), creating plasma channels within water,
generation, in situ, of electrons and OH radicals. It is shown that use
of long laser wavelength light (1350 nm and 2200 nm) ensures only
OH-induced damage to DNA is accessed. It is noteworthy that industry
presently characterizes as "eye-safe" lasers that emit at wavelengths
longer than 1300 nm.
But it is such wavelengths that are proficient at inducing damage to DNA: how safe is "eye-safe" when DNA in the eye can be readily
AAAS and EurekAlert! are not responsible
for the accuracy of news releases posted to EurekAlert! by contributing
institutions or for the use of any information through the EurekAlert!
Copyright ©2014 by AAAS, the science society.
You are currently subscribed to the RadSafe mailing list
Before posting a message to RadSafe be sure to have read and understood the RadSafe rules. These can be found at: http://health.phys.iit.edu/radsaferules.html
For information on how to subscribe or unsubscribe and other settings visit: http://health.phys.iit.edu
More information about the RadSafe