1. Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Boulevard Juriquilla, Querétaro, Qro., México;
2. Program on Nanoscience & Nanotechnology, CINVESTAV-IPN, Mexico City, Mexico;
3. Department of Electrical Engineering – SEES, CINVESTAV-IPN, Mexico City, Mexico;
4. Department of Genetics and Molecular Biology, CINVESTAV-IPN, Mexico City, Mexico;
5. Department of Electrical Engineering – Bioelectronics Section, CINVESTAV-IPN, Mexico City, Mexico