PMID: 6169346Jan 1, 1980Paper

Millimeter wave absorption spectra of biological samples

Bioelectromagnetics
O P GandhiL Bush

Abstract

A solid-state computer-controlled system has been used to make swept-frequency measurements of absorption of biological specimens from 26.5 to 90.0 GHz. A wide range of samples was used, including solutions of DNA and RNA, and suspensions of BHK-21/C13 cells, Candida albicans, C krusei, and Escherichia coli. Sharp spectra reported by other workers were not observed. The strong absorbance of water (10--30 dB/mm) caused the absorbance of all aqueous preparations that we examined to have a water-like dependence on frequency. Reduction of incident power (to below 1.0 microW), elimination of modulation, and control of temperature to assure cell viability were not found to significantly alter the water-dominated absorbance. Frozen samples of BHK-21/C13 cells tested at dry ice and liquid nitrogen temperatures were found to have average insertion loss reduced to 0.2 dB/cm but still showed no reproducible peaks that could be attributed to absorption spectra. It is concluded that the special resonances reported by others are likely to be in error.

References

Apr 1, 1979·Journal of Clinical Pathology·Y M HoC T Huang
Nov 1, 1975·Proceedings of the National Academy of Sciences of the United States of America·H Fröhlich
Jan 1, 1974·Oncology·M E StammS L Warren
Jun 21, 1969·Nature·S J Webb, A D Booth
Oct 1, 1971·Science·S J Webb, A D Booth

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Citations

May 8, 2000·Bioelectromagnetics·S I Alekseev, M C Ziskin
Apr 12, 2001·Bioelectromagnetics·S I Alekseev, M C Ziskin
Jun 26, 2001·Bioelectromagnetics·I SzaboM C Ziskin
Sep 30, 1999·Molecular Biotechnology·D M Morgan
Apr 20, 2010·International Journal of Radiation Biology·Irena CohenAmir Abramovich
Mar 18, 2021·Journal of Exposure Science & Environmental Epidemiology·Ken KaripidisAndrew Wood

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