1. Department
of Biochemistry, Federal University of Rio Grande do Sul, 90035-003 Porto Alegre, RS Brazil
2. Post-graduate
Program in Pharmaceutical Sciences, Pharmacy Faculty, Federal University of Ceará, 60430-372 Fortaleza, CE Brazil
3. Department
of Physics, Universidade Federal Rural do Semi-Árido, 59780-000 Caraúbas, RN Brazil
4. Federal Institute of Education, Science and Technology, 60040-531 Fortaleza, CE Brazil
5. Department
of Physics, Federal University of Ceará, 60455-760 Fortaleza, CE Brazil