Effect of pH on the production of the antitumor antibiotic retamycin by Streptomyces olindensis - Guimarães, Luciana Maria; Furlan, Renata L. de Araújo; Garrido, Leandro M.; Ventura, Armando Morais; Padilla, Gabriel; Facciotti, Maria Cândida Reginato (Biotechnology and Applied Biochemistry, 2004)