Solution of the Poisson-Nernst-Planck equations in the cell-substrate interface M. Pabst, G. Wrobel, S. Ingebrandt, F. Sommerhage and A. Offenhäusser Eur. Phys. J. E, 24 1 (2007) 1-8 Published online: 29 August 2007 DOI: 10.1140/epje/i2007-10204-6