Biological Effects of Radiofrequency

Cleary, Stephen F.

doi:10.1007/978-1-4684-5706-3_4

Cited by 3 publications

(2 citation statements)

References 59 publications

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“…According to the literature, two types of effects can be ascribed to microwaves, i.e. thermal and non-thermal [1,2,4,5]. The thermal effects are related to the heat generated by the absorption of microwave energy by the water medium or by organic complex systems, both characterized by a permanent or induced polarization.…”

Section: Introductionmentioning

confidence: 99%

“…The development of consumer and medical microwave devices for clinical diagnosis and therapy also has prompted widespread interest and has stimulated much research on the mechanisms of interaction of microwave radiation with living organisms [1][2][3][4][5]. According to the literature, two types of effects can be ascribed to microwaves, i.e.…”

Section: Introductionmentioning

confidence: 99%

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Non‐thermal effects of microwaves on proteins: thermophilic enzymes as model system

et al. 1997

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Two thermophilic and thermostable enzymes, isolated from Sulfolohus solfataricus, S-adenosylhomocysteine hydrolase and 5'-methylthioadenosine phosphorylase, were exposed to 10.4 GHz microwave radiation in order to discriminate between thermal and non-thermal microwave effects. The exposure causes a non-thermal, irreversible and time-dependent inactivation of both enzymes; the inactivation rate is related to the energy absorbed and is independent of the enzyme concentration. The influence of salts on enzyme inactivation has also been investigated. Conformational changes of 5-adenosylhomocysteine hydrolase, detected by fluorescence and circular dichroism techniques, suggest that microwaves induce protein structural rearrangements not related to temperature.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Non‐thermal effects of microwaves on proteins: thermophilic enzymes as model system

et al. 1997

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Effect of ultrasonic exposure time and burst frequency on the enhancement of chemotherapy by low-level ultrasound

Harrison¹,

Balcer‐Kubiczek²,

Zhang³

IEEE 1992 Ultrasonics Symposium Proceedings

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Effects of Microwave Irradiation on Collagen Denaturation

Zhang³

et al. 2010

Journal of Food Biochemistry

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The effects of microwave irradiation on the denaturation of collagen in acetic acid solution have been investigated in comparison with conventional heating. Circular dichroism measurements show that microwave irradiation can induce additional destructions of collagen triple helices due to nonthermal effect. Ultrasensitive microcalorimetry measurements further demonstrate the existence of nonthermal effect. The repeated exposure of collagen solutions to microwave along heating‐cooling cycles can only induce limited conformational changes measured with polarimetry. Our results indicate that thermal effect is the dominant factor leading to collagen denaturation, whereas nonthermal effect causes limited conformational destruction of the triple helices. PRACTICAL APPLICATION The thermal and nonthermal effects of microwave irradiation on biological system are still an open question. Whether nonthermal effect is associated with microwave irradiation and how it exerts influences if existing has no consistent statements so far. The present study helps to better understand the effect of thermal and nonthermal effects on the denaturation of protein upon microwave irradiation. The results suggest that microwave can be used in proteinous food processing safely because the total stereoisomers produced show no difference from conventional thermal denaturation of collagen.

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Biological Effects of Radiofrequency

Cited by 3 publications

References 59 publications

Non‐thermal effects of microwaves on proteins: thermophilic enzymes as model system

Non‐thermal effects of microwaves on proteins: thermophilic enzymes as model system

Effect of ultrasonic exposure time and burst frequency on the enhancement of chemotherapy by low-level ultrasound

Effects of Microwave Irradiation on Collagen Denaturation

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