title: Mechanisms of interaction of chromium with Aspergillus niger var tubingensis strain Ed8.
abstract: Experiments were conducted to determine the mechanisms of interaction with chromium of Aspergillus niger var tubingensis strain Ed8 in batch culture and in bioreactor experiments. Results obtained in this work showed that the interaction of A. niger var tubingensis Ed8 with Cr(VI) is based mainly in a reduction process and also, secondly, in a sorption process. Using electron microscopy techniques the ultrathin sections obtained from the mycelium biomass produced by the fungus in batch cultures showed the ability to incorporate Cr intracellulary, into low electron-dense inclusions, but not extracellularly. On the other hand, cultures without Cr(VI) of A. niger var tubingensis Ed8, grown in a bubble column bioreactor, reduced Cr(VI) immediately after repeated addition of this oxyanion; after six loads, 460 mg Cr(VI) was reduced to Cr(III) in 60 h, corresponding to a reduction rate of 2.62 mg Cr(VI)g(-1) dry biomass h(-1).
authors.affiliation: Departamento de Biotecnología, Universidad Autónoma Metropolitana, Unidad Iztapalapa, Av. San Rafael Atlixco no. 186, Col Vicentina México, Del. Iztapalapa, A.P. 55-535, C.P. 09340 México D.F., Mexico.
authors.forename: A
authors.initials: A
authors.lastname: Coreño-Alonso
authors.affiliation: Genetics and Microbiology Department, Biosciences Faculty, Universitat Autónoma de Barcelona, Bellaterra, 08193 Barcelona, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Solé
authors.affiliation: Genetics and Microbiology Department, Biosciences Faculty, Universitat Autónoma de Barcelona, Bellaterra, 08193 Barcelona, Spain.
authors.forename: E
authors.initials: E
authors.lastname: Diestra
authors.affiliation: Genetics and Microbiology Department, Biosciences Faculty, Universitat Autónoma de Barcelona, Bellaterra, 08193 Barcelona, Spain.
authors.forename: I
authors.initials: I
authors.lastname: Esteve
authors.affiliation: Departamento de Biología, DCNyE, Universidad de Guanajuato, Apartado Postal 187, Guanajuato, Gto 36000, Mexico.
authors.forename: J F
authors.initials: JF
authors.lastname: Gutiérrez-Corona
authors.affiliation: Departamento de Biología, DCNyE, Universidad de Guanajuato, Apartado Postal 187, Guanajuato, Gto 36000, Mexico.
authors.forename: G E
authors.initials: GE
authors.lastname: Reyna López
authors.affiliation: Departamento de Biotecnología, Universidad Autónoma Metropolitana, Unidad Iztapalapa, Av. San Rafael Atlixco no. 186, Col Vicentina México, Del. Iztapalapa, A.P. 55-535, C.P. 09340 México D.F., Mexico.
authors.forename: F J
authors.initials: FJ
authors.lastname: Fernández
authors.affiliation: Departamento de Biotecnología, Universidad Autónoma Metropolitana, Unidad Iztapalapa, Av. San Rafael Atlixco no. 186, Col Vicentina México, Del. Iztapalapa, A.P. 55-535, C.P. 09340 México D.F., Mexico. Electronic address: atc@xanum.uam.mx.
authors.forename: A
authors.initials: A
authors.lastname: Tomasini
mesh_terms: D001234:Aspergillus niger / Q000187:drug effects*; D018533:Biomass; D019149:Bioreactors; D002857:Chromium / Q000494:pharmacology*; D046529:Microscopy, Electron, Transmission; D013052:Spectrometry, X-Ray Emission
chemical_list: D002857:Chromium
keywords: A. niger var tubingensis; Bubble column bioreactor; Cr accumulation; Cr(VI) reduction