**7. Acknowledgment**

The authors wish to acknowledge the grants provided by Ministerio de Educación of Spain, Comunidad de Madrid, Ministerio de Sanidad of Spain, Laboratorios Indas S. A., Fundación Mutua Madrileña and Molecular Nanoscience Consolider-Ingenio CSD2007-0010-(2) for the realization of the works presented in this chapter.

Also they want acknowledge the collaboration of the electronic enterprise Advanced Processing Machines S. L.
