Determination of Bound Water in Biological Tissue and Energy Dissipated in Bound Water by Low Level Microwaves.
Final scientific rept. 1977-1983,
QUEEN ELIZABETH COLL LONDON (ENGLAND) DEPT OF PHYSICS
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The dielectric behaviour of water and aqueous solutions of myoglobin, DNA and human serum low-density lipoprotein LDL has been investigated over a wide frequency range. By combining the measured complex permittivity of pure water at frequencies up to 70GHz with literature values in the far infrared it is shown that the dielectric behaviour of water may be characterised by a small subsidiary dispersion centered around 600GHz, in addition to the well known microwave dispersion. The value of the infinite frequency permittivity in respect of this principal dispersion region was found to be 5.74 or - 0.31 at 20 C. Aqueous solutions of various forms of DNA were investigated between 2-18GHz but no dielectric behaviour was observed which could not be explained by classical dielectric theory. The interpretation of the dielectric measurements on aqueous solutions of myoglobin and LDL shows that both types of molecule, despite the large disparity in their size, attract a layer of irrotationally bound water of average width 1-2 molecules.