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Dosimetry of an in vitro exposure system for fluorescence measurements during 2.45 GHz microwave exposure

Published online by Cambridge University Press:  25 November 2010

Mohamad Kenaan ,
Mihaela G. Moisescu ,
Tudor Savopol ,
Diana Martin ,
Delia Arnaud-Cormos  and
Philippe Leveque
Mohamad Kenaan
Affiliation:
XLIM Research Institute, University of Limoges/CNRS, 123 avenue Albert Thomas, 87060 Limoges Cedex, France. Phone: +33 555 45 75 21.
Mihaela G. Moisescu
Affiliation:
Department of Biophysics and Cell Biotechnologies, Carol Davila Medical University, 8 Eroilor Sanitari Blv., P.O. Box 35-43, Bucharest, Romania.
Tudor Savopol
Affiliation:
Department of Biophysics and Cell Biotechnologies, Carol Davila Medical University, 8 Eroilor Sanitari Blv., P.O. Box 35-43, Bucharest, Romania.
Diana Martin
Affiliation:
National Institute for Lasers, Plasma and Radiation Physics, 409 Atomistilor Street, 077125 Magurele, Romania.
Delia Arnaud-Cormos*
Affiliation:
XLIM Research Institute, University of Limoges/CNRS, 123 avenue Albert Thomas, 87060 Limoges Cedex, France. Phone: +33 555 45 75 21.
Philippe Leveque
Affiliation:
XLIM Research Institute, University of Limoges/CNRS, 123 avenue Albert Thomas, 87060 Limoges Cedex, France. Phone: +33 555 45 75 21.
*
Corresponding author: D. Arnaud-Cormos Email: [email protected]
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Abstract

An in vitro system for 2.45 GHz microwave (MW) exposure with real-time fluorescence measurements is proposed. This system is specifically designed for the measurement of those biophysical parameters of living cells or membrane models which can be quantified by spectrofluorometric methods (e.g. membrane generalized polarization (GP), membrane fluidity, membrane potential, etc.). The novelty of the system consists in the possibility to perform fluorescence measurements on the biological samples simultaneously with their exposure to MW. The MW applicator is an open ended coaxial antenna which is dipped into a cuvette. The distribution of electromagnetic field and specific absorption rate (SAR) in the cuvette are provided from a rigorous electromagnetic numerical analysis performed with a finite difference-time domain (FDTD) based tool. With this system, fluorescence measurements were used to calculate the membrane GP values of giant unilamellar vesicle suspensions that were acquired during exposure to a 1.2 W incident power. For this power, the SAR distribution and mean SAR value for the whole volume were calculated based on temperature measurements made at different positions inside the cuvette.

Keywords

Microwave exposureFDTDGeneralized polarizationFluorescence measurements
Type
Original Article
Information
International Journal of Microwave and Wireless Technologies , Volume 3 , Issue 1 , February 2011 , pp. 81 - 86
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2010

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References

REFERENCES

[1]De Vequi-Suplicy, C.C.; Benatti, C.R.; Lamy, M.T.: Laurdan in fluid bilayers: position and structural sensitivity. J. Fluoresc., 16 (3) (2006), 431–439.CrossRefGoogle ScholarPubMed
[2]Deshan, Y. et al. : A floating sleeve antenna yields localized hepatic microwave ablation. IEEE Trans. Biomed. Eng., 53 (3) (2006), 533–537.Google Scholar
[3]Gaber, M.H.; El Halim, N.A.; Khalil, W.A.: Effect of microwave radiation on the biophysical properties of liposomes. Bioelectromagnetics, 26 (3) (2005), 194–200.CrossRefGoogle ScholarPubMed
[4]Gerbaux, N.A.X.; Glowacki, J.; Ammann, M.J.; Thorne, V.P.: Investigation of the near-field behaviour and SAR for the resonant loop antenna operating at 434 MHz for medical applications. Microw. Opt. Technol. Lett., 47 (6) (2005), 597–599.CrossRefGoogle Scholar
[5]Hurter, W.; Reinbold, F.; Lorenz, W.J.: A dipole antenna for interstitial microwave hyperthermia. IEEE Trans. Microw. Theory Tech., 39 (6) (1991), 1048–1054.CrossRefGoogle Scholar
[6]Kuster, N.; Schönborn, F.: Recommended minimal requirements and development guidelines for exposure setups of bio-experiments addressing the health risk concern of wireless communications. Bioelectromagnetics, 21 (7) (2000), 508–514.3.0.CO;2-F>CrossRefGoogle ScholarPubMed
[7]Laval, L.; Leveque, P.; Jecko, B.: A new in vitro exposure device for the mobile frequency of 900 MHz. Bioelectromagnetics, 21 (4) (2000), 255–263.3.0.CO;2-4>CrossRefGoogle Scholar
[8]Leveque, P.; Dale, C.; Veyret, B.; Wiart, J.: Dosimetric analysis of a 900-MHz rat head exposure system. IEEE Trans. Microw. Theory Tech., 52 (8) (2004), 2076–2083.CrossRefGoogle Scholar
[9]Leveque, P.; Reineix, A.; Jecko, B.: Modeling of dielectric losses in microstrip patch antennas – application of FDTD method. Electron. Lett., 28 (6) (1992), 539–541.CrossRefGoogle Scholar
[10]Lucio, A.D.; Vequi-Suplicy, C.C.; Fernandez, R.M.; Lamy, M.T.: Laurdan spectrum decomposition as a tool for the analysis of surface bilayer structure and polarity: a study with DMPG, peptides and cholesterol. J. Fluoresc., 20 (2) (2010), 473–482.CrossRefGoogle ScholarPubMed
[11]O'Connor, R.P.; Madison, S.D.; Leveque, P.; Roderick, H.L.; Bootman, M.D.: Exposure to GSM RF fields does not affect calcium homeostasis in human endothelial cells, rat pheocromocytoma cells or rat hippocampal neurons. PLoS ONE, 5 (7) (2010), 16.CrossRefGoogle ScholarPubMed
[12]Pickard, W.F.; Straube, W.L.; Moros, E.G.: Experimental and numerical determination of SAR distributions within culture flasks in a dielectric loaded radial transmission line. IEEE Trans. Biomed. Eng., 47 (2) (2000), 202–208.CrossRefGoogle Scholar
[13]Savopol, T.; Kovacs, E.; Iacob, N.; Martin, D., Bajenaru, L.; Miclaus, S.: Lipid phase transition temperature modifications by microwave irradiation of model membranes. Eur. Biophys. J. Biophys. Lett., 36, Suppl. 1 (2007), S86–P135.Google Scholar
[14]Schuderer, J.; Spat, D.; Samaras, T.; Oesch, W.; Kuster, N.: In vitro exposure systems for RF exposures at 900 MHz. IEEE Trans. Microw. Theory Tech., 52 (8) (2004), 2067–2075.CrossRefGoogle Scholar
[15]Szoka, F.; Papahadjopoulos, D.: Procedure for preparation of liposomes with large internal aqueous space and high capture by reverse-phase evaporation. Proc. Natl. Acad. Sci. USA, 75 (9) (1978), 4194–4198.CrossRefGoogle ScholarPubMed
[16]Taflove, A.; Hagness, S.C.: Computational Electrodynamics: The Finite-difference Time-domain Method, 3rd ed., Artech House, Boston, 2005.Google Scholar
[17]Yee, K.: Numerical solution of initial boundary value problems involving maxwell's equations in isotropic media. IEEE Trans. Antennas Propag., 14 (3) (1966), 302–307.Google Scholar
[18]Zhao, J.: Improvement of MMW irradiation uniformity in culture dishes for experiments on MMW biological effects. Microw. Opt. Technol. Lett., 40 (3) (2004), 258–261.CrossRefGoogle Scholar