Nagamalai Vasimalai (Life Sciences Department, International Iberian Nanotechnology Laboratory (INL), Avenida Mestre Veiga, 4715-330 Braga, Portugal.), Vania Vilas-Boas (Life Sciences Department, International Iberian Nanotechnology Laboratory (INL), Avenida Mestre Veiga, 4715-330 Braga, Portugal.), Juan Gallo (International Iberian Nanotechnology Laboratory (INL), Avenida Mestre Veiga, 4715-330 Braga, Portugal.), Cerqueira M.F. (Center of Physics, University of Minho, 4710-057 Braga, Portugal.), Menéndez M (Department of Physical and Analytical Chemistry, University of Oviedo Julian Clavería 8, 33006 Oviedo, Spain), Costa J.M (Department of Physical and Analytical Chemistry, University of Oviedo Julian Clavería 8, 33006 Oviedo, Spain), Lorena Diéguez (Life Sciences Department, International Iberian Nanotechnology Laboratory (INL), Avenida Mestre Veiga, 4715-330 Braga, Portugal.), Begona Espina (Life Sciences Department, International Iberian Nanotechnology Laboratory (INL), Avenida Mestre Veiga, 4715-330 Braga, Portugal.), Maria Teresa Fernandez-arguelles (Life Sciences Department, International Iberian Nanotechnology Laboratory (INL), Avenida Mestre Veiga, 4715-330 Braga, Portugal.)