1. School of Technology, Pontifical Catholic University of Rio Grande do Sul, Building 32, Ipiranga Avenue, 6681 Porto Alegre, RS, Brazil
2. Institute of Petroleum and Natural Resources, Pontifical Catholic University of Rio Grande do Sul, Ipiranga Avenue, 6681 Porto Alegre, RS, Brazil
3. Department of Biology and Environmental Science, Linnaeus University, 391-82 Kalmar, Sweden
4. Company INDPROS, 90450-190 Porto Alegre, RS, Brazil