[1] Inst Fed Educ Ciencia & Tecnol Ceara, BR-60040531 Fortaleza, Ceara, Brazil
[2] Univ Fed Maranhao, Dept Fis, BR-65080040 Sao Luis, MA, Brazil
[3] Univ Fed Ceara, Dept Fis, BR-60455900 Fortaleza, Ceara, Brazil
[4] Univ Fed Ceara, Dept Quim Analit & Fis Quim, BR-60455900 Fortaleza, Ceara, Brazil
[5] Univ Fed Rio Grande do Norte, Dept Biofis & Farmacol, BR-59072970 Natal, RN, Brazil
[6] Univ Fed Rio Grande do Sul, Ctr Biotecnol, BR-91501970 Porto Alegre, RS, Brazil
[7] Univ Fed Rio Grande do Sul, Dept Bioquim, BR-90035003 Porto Alegre, RS, Brazil