Bacillus subtilis endospores at high purity and recovery yields: optimization of growth conditions and purification method - Tavares, Milene B.; Souza, Renata Damasio de; Luiz, Wilson Barros; Cavalcante, Rafael Ciro Marques; Casaroli, Caroline; Martins, Eduardo G.; Ferreira, Rita de Cássia Café; Ferreira, Luís Carlos de Souza (Current Microbiology, 2013)