title: Selection of an actinobacteria mixed culture for chlordane remediation. Pesticide effects on microbial morphology and bioemulsifier production.
abstract: Chlordane bioremediation using actinobacteria mixed culture is an attractive clean-up technique. Their ability to produce bioemulsifiers could increase the bioavailability of this pesticide. In order to select a defined actinobacteria mixed culture for chlordane remediation, compatibility assays were performed among six Streptomyces strains. The strains did not show growth inhibition, and they were assayed for chlordane removal, either as pure or as mixed cultures. In pure cultures, all of the strains showed specific dechlorination activity (1.42-24.20 EU mg(-1)) and chlordane removal abilities (91.3-95.5%). The specific dechlorination activity was mainly improved with cultures of three or four microorganisms. The mixed culture consisting of Streptomyces sp. A2-A5-A13 was selected. Their ability to produce bioemulsifiers in the presence of glucose or chlordane was tested, but no significant differences were observed (p > 0.05). However, the stability of the emulsions formed was linked to the carbon source used. Only in chlordane presence the emulsions retained 100% of their initial height. Finally, the selected consortium showed a high degree of sporulation in the pesticide presence. This is the first study on the effects that chlordane exerts on microbe morphology and emulsifier production for a defined mixed culture of Streptomyces with ability to remediate the pesticide.
authors.affiliation: Planta Piloto de Procesos Industriales Microbiológicos (PROIMI-CONICET), Avenida Belgrano y Pasaje Caseros, Tucumán, Argentina.
authors.forename: María S
authors.initials: MS
authors.lastname: Fuentes
authors.affiliation: Planta Piloto de Procesos Industriales Microbiológicos (PROIMI-CONICET), Avenida Belgrano y Pasaje Caseros, Tucumán, Argentina.|Universidad de San Pablo-Tucumán, Argentina.
authors.forename: Verónica L
authors.initials: VL
authors.lastname: Colin
authors.affiliation: Planta Piloto de Procesos Industriales Microbiológicos (PROIMI-CONICET), Avenida Belgrano y Pasaje Caseros, Tucumán, Argentina.|Universidad del Norte Santo Tomás de Aquino, Tucumán, Argentina.|Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Tucumán, Argentina.
authors.forename: María J
authors.initials: MJ
authors.lastname: Amoroso
authors.affiliation: Universidad del Norte Santo Tomás de Aquino, Tucumán, Argentina.|Unidad de Administración Territorial, Centro Científico Tecnológico, CONICET-Tucumán, Tucumán, Argentina.
authors.forename: Claudia S
authors.initials: CS
authors.lastname: Benimeli
mesh_terms: D001711:Biotransformation; D002706:Chlordan / Q000378:metabolism*; D045703:Emulsifying Agents / Q000378:metabolism*; D005947:Glucose / Q000378:metabolism; D059013:Microbial Consortia; D010575:Pesticides / Q000378:metabolism*; D012641:Selection, Genetic; D013171:Spores, Bacterial / Q000254:growth & development; D013302:Streptomyces / Q000254:growth & development / Q000302:isolation & purification / Q000378:metabolism*
chemical_list: D045703:Emulsifying Agents; D010575:Pesticides; D002706:Chlordan; D005947:Glucose
keywords: Bioemulsifier production; Bioremediation; Chlordane; Mixed culture