1. Graduate student, Technical Univ. of Berlin, Dept. of Chemical Engineering, Sekretariat MA 5-7, Strasse des 17 Juni, 10623 Berlin, Germany.
2. Associate Professor, Dept. of Chemical Engineering, Univ. of Concepción, Casilla 160-C, Correo 3, Concepción, Chile.
3. Professor, Dept. of Microbiology, Univ. of Concepción, Casilla 160-C, Correo 3, Concepción, Chile.
4. Professor, Dept. of Chemical Engineering, Univ. of Concepción, Casilla 160-C, Correo 3, Concepción, Chile.
5. Professor, Dept. of Chemical Engineering, Univ. of Concepción, Casilla 160-C, Correo 3, Concepción, Chile (corresponding author).