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Italie: Blootstelling aan HF microgolfstraling met vergaande gevolgen voor biologische systemen. Bron: Bioelectrochemistry. 2011 Oct 13. Microwave induced shift of the main phase transition in phosphatidylcholine membranes. Beneduci A, Filippelli L, Cosentino K, Calabrese ML, Massa R, Chidichimo G. Department of Chemistry, University of Calabria, Via P. Bucci-Cubo 17/D, 87036 Arcavacata di Rende (CS), Italy; Consorzio TEBAID c/o Department of Chemistry, University of Calabria, Via P. Bucci-Cubo 15/D, 87036 Arcavacata di Rende (CS), Italy. Abstract Numerous experimental evidence show that exposure of biological systems to extremely high frequency microwaves may induce significant effects even at low powers. These effects are thought to occur via nonthermal mechanisms involving primarily the interaction of microwaves with phospholipid membrane structures. However, no conclusive experimental evidence that biomembranes exhibit remarkable sensitivity to this radiation has been provided up to now. Here, deuterium nuclear magnetic resonance spectroscopy is used to study the effects of microwaves on 1,2-Dimyristoyl-sn-glycero-3-phosphatidylcholine/(2)H(2)O multilamellar vesicles that serve as biomimetic membranes. Here we show that, if the membrane is brought into close proximity to the transition point, microwaves induce a reduction of water ordering at the membrane interface, an upward shift of the main phase transition temperature and a broadening of the transition region. A deep dosimetric analysis shows that the above effects are nonthermal, indicating the need for a nonthermal hypothesis to explain them. This study suggests that exposure to high-frequency microwaves can have far reaching consequences on active biological systems. Voor het originele abstract zie: www.ncbi.nlm.nih.gov/pubmed/22082754?dopt=Abstract .
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