Feldbeschreibung   Formation of reactive oxygen species in L929 cells after exposure to 900 MHz RF radiation with and without co-exposure to 3-chloro-4-(dichloromethyl)-5-hydroxy-2(5H)-furanone. by Zeni O, Di Pietro R, d'Ambrosio G, Massa R, Capri M, Naarala J, Juutilainen J, Scarfi MR published in: Radiat Res 2007; 167 (3): 306 - 311 Bitte geben Sie Ihre E-Mail-Adresse an (freiwillig) General information: Six conditions were tested for each RF signal: sham exposure and two levels of RF radiation, each alone and together with MX treatment. Exposure 1: Main characteristics frequency: 900 MHz type of field: electromagnetic field field characteristics: guided field Modulation type of modulation: continuous wave (CW) Exposure setup exposure source/structure: cellular phone, waveguide exposure time pattern: continuous for 10 or 30 min chamber details: The exposure chamber was made of a rectangular waveguide (124 x 248 x 500 mm) and two coax-to-waveguide adapters and was terminated on a matched load. setup details: Two T-75 cell culture flasks containing 15 ml of medium were inserted into the waveguide. The narrow side of the waveguide and the E field were horizontal, i.e., parallel to the liquid layer (2 mm thick) in the rectangular plastic flask. sham: sham exposure was performed add. information: The temperature of the waveguide was maintained at 37.0 ± 0.1°C by thermostatted water circulating in a 30-m-long plastic tube (8 mm inner diameter) wound around the waveguide and kept in contact by wooden boards. A polyurethane foam cover was used for thermal insulation. Exposure parameters parameter: value: type: method: remark: SAR  0.3 W/kg  mean value  measured and calculated  -  SAR  1 W/kg  mean value  measured and calculated  -  measurement and calculation details: The electric field intensities and the related SARs were evaluated numerically at each node of the calculation grid, and the average SAR, its standard deviation, and the coefficient of variation (CV) were also calculated. The CV, usually taken as the ''nonuniformity degree'', was found to be 0.39, and thus slightly exceeding the upper limit of 0.30 suggested in literature [Kuster et al., 2000] due to the large size of the samples. Spot measurements of temperature [Allis et al., 1977] were also taken to validate the numerical simulations of the power deposition pattern, and good agreement was found with measured data. The incident, reflected, and transmitted powers were measured during the actual exposure using bi-directional power sensors connected to a computer. Exposure 2: Main characteristics frequency: 900 MHz type of field: electromagnetic field field characteristics: guided field Modulation type of modulation: pulsed (PW) add. information: GSM-modulated signal Exposure setup exposure source/structure: same setup as in Exposure 1 exposure time pattern: continuous for 10 or 30 min sham: sham exposure was performed Exposure parameters parameter: value: type: method: remark: SAR  0.3 W/kg  mean value  measured and calculated  -  SAR  1 W/kg  mean value  measured and calculated  -  Reference articles Kuster N et al. (2000): Recommended minimal requirements and development guidelines for exposure setups... Allis JW et al. (1977): Measurement of microwave radiation absorbed by biological systems, 1. Analysis... Kommentar zu Feld/ern (max. 2000 Zeichen): Zu den Artikel-Basisdaten Glossar: cell culture, cellular phone, coefficient, computer, CW, electric, electromagnetic field, exposure, field intensities, GSM, matched, mean value, medium, MHz, modulated, MX, power, pulsed, PW, radiation, RF, SAR, Sensors, sham exposure, signal, standard deviation, thermal, waveguide

© 1997 - 2013, Forschungszentrum für Elektro-Magnetische Umweltverträglichkeit (femu - RWTH Aachen).

Alle Rechte vorbehalten. Gestattet sind lediglich Abruf, Ansicht und Ausdruck, jedoch nicht Reproduktion, Veröffentlichung oder Weitergabe dieser Dokumente, ausschließlich für persönlichen und nichtkommerziellen Gebrauch, sofern (i) die Information in keiner Weise verändert und (ii) jedweder Copyright-Vermerk in allen Dokumenten nicht entfernt, sondern unverändert übernommen wird.

Die bereitgestellte Information stellt nicht den offiziellen Standpunkt des femu - RWTH Aachen dar, es sei denn, dies ist ausdrücklich vermerkt. Durch Abruf, Ansicht oder Ausdruck dieser Dokumente erklären Sie sich mit den im Kleingedruckten genannten Bedingungen ausdrücklich einverstanden.