2050-750X(2013)1:7;1-1 ISSN 2050-750X Materials for biology and medicine Journal of Materials Chemistry B www.rsc.org/MaterialsB Volume 1 | Number 7 | 21 February 2013 | Pages 897–1068 PAPER Tapas K. Kundu, Tapas K. Maji, M. Eswaramoothy et al. Multifunctional carbon nanospheres with magnetic and luminescent probes: probable brain theranostic agents