title: Organic and inorganic nitrogen source ratio effects onBacillus thuringiensis var.israelensis delta-endotoxin production.
abstract: The influence of different organic and inorganic nitrogen source combinations and C∶N ratios was studied in connection with growth and protein production ofBacillus thuringiensis var.israelensis. Protein production was assumed to be proportional to delta-endotoxin production. Delta-endotoxin concentration increased when media were supplemented with (NH4)2SO4, but the delta-endotoxin: biomass dry weight ratio was unaffected by different C∶N ratios. Organic nitrogen source, yeast extract, could be partially replaced by (NH4)2SO4 with a significant increase in delta-endotoxin production.
authors.affiliation: Centro de Investigación y Desarrollo en Fermentaciones Industriales (CINDEFI), Facultad de Ciencias Exactas (Universidad Nacional de La Plata), 47 y 115, 1900, La Plata, Argentina.
authors.forename: C A
authors.initials: CA
authors.lastname: Avignone Rossa
authors.forename: O M
authors.initials: OM
authors.lastname: Yantorno
authors.forename: J A
authors.initials: JA
authors.lastname: Arcas
authors.forename: R J
authors.initials: RJ
authors.lastname: Ertola