[DIYbio] Re: Radio opaque biomolecule?

On Mon, Jan 2, 2012 at 1:41 PM, Simon Quellen Field <sfield@scitoys.com> wrote
> There are lots of interesting papers dealing with radio frequency effects in
> biological materials.
>

This looks interesting, anyone have access?:
http://journals.lww.com/health-physics/Abstract/2008/10000/Quantitative_Evaluations_of_Mechanisms_of.1.aspx

Health Physics:
October 2008 - Volume 95 - Issue 4 - pp 365-396
doi: 10.1097/01.HP.0000319903.20660.37
Review Article
Quantitative Evaluations of Mechanisms of Radiofrequency Interactions
With Biological Molecules and Processes
Sheppard, Asher R.*; Swicord, Mays L.†; Balzano, Quirino‡

Abstract
The complexity of interactions of electromagnetic fields up to 1012 Hz
with the ions, atoms, and molecules of biological systems has given
rise to a large number of established and proposed biophysical
mechanisms applicable over a wide range of time and distance scales,
field amplitudes, frequencies, and waveforms. This review focuses on
the physical principles that guide quantitative assessment of
mechanisms applicable for exposures at or below the level of
endogenous electric fields associated with development, wound healing,
and excitation of muscles and the nervous system (generally, 1 to 102
V m-1), with emphasis on conditions where temperature increases are
insignificant (←1 K). Experiment and theory demonstrate possible
demodulation at membrane barriers for frequencies ≤10 MHz, but not at
higher frequencies. Although signal levels somewhat below system noise
can be detected, signal-to-noise ratios substantially less than 0.1
cannot be overcome by cooperativity, signal averaging, coherent
detection, or by nonlinear dynamical systems. Sensory systems and
possible effects on biological magnetite suggest paradigms for extreme
sensitivity at lower frequencies, but there are no known
radiofrequency (RF) analogues. At the molecular level, vibrational
modes are so overdamped by water molecules that excitation of
molecular modes below the far infrared cannot occur. Two RF mechanisms
plausibly may affect biological matter under common exposure
conditions. For frequencies below approximately 150 MHz, shifts in the
rate of chemical reactions can be mediated by radical pairs and, at
all frequencies, dielectric and resistive heating can raise
temperature and increase the entropy of the affected biological
system.

--
Nathan McCorkle
Rochester Institute of Technology
College of Science, Biotechnology/Bioinformatics

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