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Polarization potential has no effect on maximum current density produced by Halotolerant bioanodes

MURIEL ELISA GONZALEZ MUÑOZ XOCHITL DOMINGUEZ BENETTON Jorge Arturo Domínguez Maldonado DAVID SERGIO VALDES LOZANO Daniella Esperanza Pacheco Catalán BENJAMIN OTTO ORTEGA MORALES Liliana María Alzate Gaviria (2018)

Halotolerant bioanodes are considered an attractive alternative in microbial electrochemical systems, as they can operate under higher conductive electrolytes, in comparison with traditional wastewater and freshwater bioanodes. The dependency between energetic performance and polarization potential has been addressed in several works; however the vast majority discusses its effect when wastewater or freshwater inocula are employed, and fewer reports focus on inocula from highly-saline environments. Moreover, the effect of the polarization potential on current production is not fully understood. To determine if the polarization potential has a significant effect on current production, eight bioanodes were grown by chronoamperometry at positive and negative potentials relative to the reference electrode (+0.34 V/SHE and −0.16 V/SHE), in a three-electrode set-up employing sediments from a hyperhaline coastal lagoon. The maximum current density obtained was the same, despite the differences in the applied potential. Our findings indicate that even if differences in organic matter removal and coulombic efficiency are obtained, the polarization potential had no statistically significant effect on overall current density production.

Article

POLARIZATION POTENTIAL HALOTOLERANT BIOANODES MICROBIAL ELECTROCHEMICAL SYSTEMS INGENIERÍA Y TECNOLOGÍA INGENIERÍA Y TECNOLOGÍA

Antimicrobial properties of moderately halotolerant bacteria from cenotes of the Yucatan Peninsula

SUSANA DEL CARMEN DE LA ROSA GARCIA ANDRES ADOLFO MUÑOZ GARCIA LUIS FELIPE BARAHONA PEREZ MARIA MARCELA GAMBOA ANGULO (2007)

 A total of 258 bacterial strains were isolated from the water and sediment of two cenotes in the Yucatan peninsula, all of which were screened against six pathogenic micro‐organisms. Antimicrobial activity was detected in 46 of the isolated strains against at least one of the target strains tested. Antimicrobially active isolates were identified as: Aeromonas, Bacillus, Burkholderia, Photobacterium, Pseudomonas, Serratia, Shewanella, Stenotrophomonas genera, and 13 remained unidentified. All antimicrobially active strains were able to grow in salt medium at a concentration of 75 g l−1, thus classifying as moderately halotolerant bacteria. Most of the antimicrobially active strains exhibited a broad action spectrum, where 61% was because of uncharacterized antimicrobial substances, 25% because of bacteriocins and 13% because of siderophores. Ten strains were able to biosynthesize biosurfactant metabolites.

Article

ANTIMICROBIAL BACTERIA BACTERIOCIN BIOSURFACTANT CENOTE HALOTOLERANT SIDEROPHORE BIOLOGÍA Y QUÍMICA BIOLOGÍA Y QUÍMICA