Karina S Pérez*, J O Estevez, Antonio Méndez-Blas, Jesús Arriaga, Gabriela Palestino and Miguel E Mora-Ramos
* Corresponding author: Karina S Pérez kperez@ifuap.buap.mx
Nanoscale Research Letters 2012, 7:392 doi:10.1186/1556-276X-7-392