[WORLD SCIENTIFIC Proceedings of the II International Conference on Environmental, Industrial and Applied Microbiology (BioMicroWorld2007) - University of Seville, Spain (28 November – 1 December 2007)] Current Research Topics in Applied Microbiology and Microbial Biotechnology - Expression, purification and characterization of the precursor of human pulmonary surfactant protein B (preproSPB) produced in Escherichia coli