Noise effects in two different biological systems B. Spagnolo, S. Spezia, L. Curcio, N. Pizzolato, A. Fiasconaro, D. Valenti, P. Lo Bue, E. Peri and S. Colazza Eur. Phys. J. B, 69 1 (2009) 133-146 Published online: 08 May 2009 DOI: 10.1140/epjb/e2009-00162-y