"Resonances" in the dielectric absorption of DNA?

Foster, Kenneth R.; Epstein, Benjamin R.; Gealt, Michael A.

doi:10.1016/s0006-3495(87)83231-9

Cited by 47 publications

(17 citation statements)

References 15 publications

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“…After some initial reports that frequency specific absorption in plasmids of DNA could occur [Swicord and Davis, 1982;Edwards et al, 1984Edwards et al, , 1985, follow-up investigations revealed that this was not the case [Foster et al, 1987;Gabriel et al, 1987]. This is an important observation, since without evidence of a direct and unique absorption mechanism that could result in redistribution in some manner of the absorbed energy in the molecule, the alternative is that some type of direct bond breakage was occurring.…”

Section: Direct Damage Due To Absorption Of the Rf By Dna In Solutionmentioning

confidence: 98%

Radiofrequency exposure and mammalian cell toxicity, genotoxicity, and transformation

Meltz

2003

Bioelectromagnetics

106

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The published in vitro literature relevant to the issue of the possible induction of toxicity, genotoxicity, and transformation of mammalian cells due to radiofrequency field (RF) exposure is examined. In some instances, information about related in vivo studies is presented. The review is from the perspective of technical merit and also biological consistency, especially with regard to those publications reporting a positive effect. The weight of evidence available indicates that, for a variety of frequencies and modulations with both short and long exposure times, at exposure levels that do not (or in some instances do) heat the biological sample such that there is a measurable increase in temperature, RF exposure does not induce (a) DNA strand breaks, (b) chromosome aberrations, (c) sister chromatid exchanges (SCEs), (d) DNA repair synthesis, (e) phenotypic mutation, or (f) transformation (cancer-like changes). While there is limited experimental evidence that RF exposure induces micronuclei formation, there is abundant evidence that it does not. There is some evidence that RF exposure does not induce DNA excision repair, suggesting the absence of base damage. There is also evidence that RF exposure does not inhibit excision repair after the induction of thymine dimers by UVexposure, as well as evidence that indicates that RF is not a co-carcinogen or a tumor promoter. The article is in part a tutorial, so that the reader can consider similarities and discrepancies between reports of RF-induced effects relative to one another. Bioelectromagnetics Supplement 6:S196-S213,

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Section: Direct Damage Due To Absorption Of the Rf By Dna In Solutionmentioning

confidence: 98%

Radiofrequency exposure and mammalian cell toxicity, genotoxicity, and transformation

Meltz

2003

Bioelectromagnetics

106

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“…Furthermore, athermal mechanisms are proposed for rectification by cell membranes (Pickard and Rosenbaum, 1978), which has been observed in plant cells at frequencies below 10 MHz; vibrational resonance in DNA molecules (Edwards, 1984); and structural transformations from random to coiled configurations in polymeric proteins. Careful measurements recently performed in various laboratories have not confirmed the earlier claims of resonance in DNA molecules (Foster, 1987;Gabril, 1987). In addition, the RF hearing phenomena may be considered athermal or microthermal since the temperature rise is very small (as low as 10…”

Section: Introductionmentioning

confidence: 95%

Low level microwave exposure decreases the number of male germ cells and affect vital organs of Sprague Dawley rats

Usikalu¹,

Aweda²,

Babatunde³

et al. 2010

AJSIR

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The effects of 2.45 GHz microwave (MW) radiation on the vital tissues of Sprague Dawley rats were investigated. The various tissues assessed through histopathological assay were liver, kidney, heart, testis, ovary, fallopian tube, prostate, seminal vesicle and epididymis. The animals were exposed to various level of Specific Absorption Rate (SAR) which were 0 (control), 0.48, 0.95, 1.43, 1.91 and 2.39 W/kg using the microwave generator, model ER660E, Serial No MX704CCR from Toshiba UK Ltd for maximum period of ten minutes. From the results it was observed that the kidney and ovary were the most affected tissues in the female animals exposed to 2.45 GHz MW radiation when compared to the control. Hyperchromasia was observed in the ovary of the animals exposed to MW radiation. Vascular/glomerular congestion, interstitial spaces hemorrhage and tubular cells cloudiness was observed in the kidney. In the male animals, the testis and liver were the most affected organs when compared with control. There was reduction in the number of germ cells and cell disorganization observed from the testis of exposed group. The degree of reduction in the number of the germ cells varies with SARs, highest reduction was observed in the group V exposed to 2.39 W/kg which suggest that MW radiation has the potential to affects male fertility adversely. Oodema, cloudiness, glomeruli congestion was observed in the liver. There is no significant proof that the microwave radiation at this study frequency produces pathologic effects on the tissue studied except for the decrease in the number of germ cells and modification of some organs.

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“…In Refs. [16,17], it was demonstrated that there are no microwave resonance effects owing to DNA. An extended analysis in Ref.…”

Section: Introductionmentioning

confidence: 99%

Magnetic-dipolar-mode Fano resonances for microwave spectroscopy of high absorption matter

Vaisman

Kamenetskii

Shavit

2015

J. Phys. D: Appl. Phys.

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Study of interaction between high absorption matter and microwave radiated energy is a subject of great importance. Especially, this concerns microwave spectroscopic characterization of biological liquids. Use of effective testing methods to obtain information about physical properties of different liquids on the molecular level is one of the most important problems in biophysics. However, the standard methods based on the microwave resonant techniques are not sufficiently suitable for biological liquids because the resonance peak in a resonator with high-loss liquids is so broad that the material parameters cannot be measured correctly. Although molecular vibrations of biomolecules may have microwave frequencies, it is not thought that such resonant coupling is significant due to their low energy compared with thermal energy and the strongly dampening aqueous environment. This paper presents an innovative microwave sensing technique for different types of lossy materials, including biological liquids. The technique is based on the combination of the microwave perturbation method and the Fano-resonance effects observed recently in microwave structures with embedded magnetic-dipolar quantum dots. When frequency of the magnetic-dipolar-mode (MDM) resonance is not equal to the cavity resonance frequency, one gets Fano transmission intensity. With tuning, by a bias magnetic field, the MDM resonance frequency to the cavity resonance frequency, one observes a Lorentz line shape. Use of an extremely narrow Lorentzian peak allows exact probing the resonant frequency of a cavity loaded by a highlossy-material sample. For different kinds of samples, one has different frequencies of Lorentzian peaks. This gives a picture for precise spectroscopic characterization of high absorption matter in microwaves. PACS number(s) 41.20.Jb, 42.25.Fx, 76.50.+g

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"Resonances" in the dielectric absorption of DNA?

Cited by 47 publications

References 15 publications

Radiofrequency exposure and mammalian cell toxicity, genotoxicity, and transformation

Radiofrequency exposure and mammalian cell toxicity, genotoxicity, and transformation

Low level microwave exposure decreases the number of male germ cells and affect vital organs of Sprague Dawley rats

Magnetic-dipolar-mode Fano resonances for microwave spectroscopy of high absorption matter

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