Dresden 2014 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 4: Membranes and Vesicles I

BP 4.4: Vortrag

Montag, 31. März 2014, 16:00–16:15, HÜL 386

Nanometer-resolved radio-frequency absorption and heating in bio-membranes — •Stephan Gekle¹ and Roland Netz² — ¹Physikalisches Institut, Universität Bayreuth — ²Fachbereich Physik, Freie Universität Berlin

Radio-frequency (RF) electromagnetic fields are readily absorbed in biological matter and lead to dielectric heating. To understand how RF radiation possibly influences biological function, a quantitative description of dielectric absorption and heating at nanometer resolution beyond the usual effective medium approach is crucial.

We report an exemplary multi-scale theoretical study for bio-membranes that combines i) atomistic simulations for the spatially resolved absorption spectrum at a single planar DPPC lipid bilayer immersed in water, ii) calculation of the electric field distribution in planar and spherical cell models, and iii) prediction of the nanometer resolved temperature profiles under steady RF radiation.

For a spherical cell model, we find a strongly enhanced RF absorption on an equatorial ring, which gives rise to temperature gradients inside a single cell under radiation.