1. Institute of Advanced Studies, Thematic Axes Program of the University of São Paulo, São Paulo 05508-220, Brazil
2. Department of Animal Production and Nutrition, University of São Paulo, São Paulo 05508-220, Brazil
3. Department of Physics, University of Coimbra, 3004-516 Coimbra, Portugal
4. Department of Botany, Institute of Biosciences, University of São Paulo, São Paulo 05508-220, Brazil