1 The origin of the dual fluorescence of protonated ellipticine in water Zsombor Miskolczy, a László Biczók, a* István Jablonkai b a Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, P.O. Box 286, 1519 Budapest, Hungary b Institute of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, P.O. Box 286, 1519 Budapest, Hungary * Corresponding author. E-mail: biczok.laszlo@ttk.mta.hu