1. University of Puerto Rico-Humacao, Department of Biology, Call Box 860, Humacao 00792 PR, USA
2. University of Puerto Rico-Humacao, Department of Chemistry, Call Box 860, Humacao 00792 PR, USA
3. University of Puerto Rico-Humacao, Department of Physics & Electronics, Call Box 860, Humacao 00792 PR, USA
4. Florida Atlantic University, Department of Chemistry & Biochemistry, Boca Raton, 33431, FL, USA