1 23 Biotechnology Letters ISSN 0141-5492 Biotechnol Lett DOI 10.1007/s10529-014-1717-9 Culturing Drosophila melanogaster (S2) in a chemostat Paula Bruzadelle Vieira, Bruno Labate Vale da Costa, Elisabeth de Fatima Pires Augusto & Aldo Tonso