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  1. Article: Fluid-like cathode enhances valuable biomass production from brewery wastewater in purple phototrophic bacteria.

    Manchon, Carlos / Asensio, Yeray / Muniesa-Merino, Fernando / Llorente, María / Pun, Álvaro / Esteve-Núñez, Abraham

    Frontiers in microbiology

    2023  Volume 14, Page(s) 1115956

    Abstract: The climate crisis requires rethinking wastewater treatment to recover resources, such as nutrients and energy. In this scenario, purple phototrophic bacteria (PPB), the most versatile microorganisms on earth, are a promising alternative to transform the ...

    Abstract The climate crisis requires rethinking wastewater treatment to recover resources, such as nutrients and energy. In this scenario, purple phototrophic bacteria (PPB), the most versatile microorganisms on earth, are a promising alternative to transform the wastewater treatment plant concept into a biorefinery model by producing valuable protein-enriched biomass. PPB are capable of interacting with electrodes, exchanging electrons with electrically conductive materials. In this work, we have explored for mobile-bed (either stirred or fluidized) cathodes to maximize biomass production. For this purpose, stirred-electrode reactors were operated with low-reduced (3.5 e
    Language English
    Publishing date 2023-03-13
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2587354-4
    ISSN 1664-302X
    ISSN 1664-302X
    DOI 10.3389/fmicb.2023.1115956
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Microbial photoelectrosynthesis: Feeding purple phototrophic bacteria electricity to produce bacterial biomass.

    Manchon, Carlos / Muniesa-Merino, Fernando / Llorente, María / Esteve-Núñez, Abraham

    Microbial biotechnology

    2022  Volume 16, Issue 3, Page(s) 569–578

    Abstract: Purple phototrophic bacteria are one of the main actors in chemolithotrophic carbon fixation and, therefore, fundamental in the biogeochemical cycle. These microbes are capable of using insoluble electron donors such as ferrous minerals or even carbon- ... ...

    Abstract Purple phototrophic bacteria are one of the main actors in chemolithotrophic carbon fixation and, therefore, fundamental in the biogeochemical cycle. These microbes are capable of using insoluble electron donors such as ferrous minerals or even carbon-based electrodes. Carbon fixation through extracellular electron uptake places purple phototrophic bacteria in the field of microbial electrosynthesis as key carbon capturing microorganisms. In this work we demonstrate biomass production dominated by purple phototrophic bacteria with a cathode (-0.6 V vs. Ag/AgCl) as electron donor. In addition, we compared the growth and microbial population structure with ferrous iron as the electron donor. We detect interaction between the cathode and the consortium showing a midpoint potential of 0.05 V (vs. Ag/AgCl). Microbial community analyses revealed different microbial communities depending on the electron donor, indicating different metabolic interactions. Electrochemical measurements together with population analyses point to Rhodopseudomonas genus as the key genus in the extracellular electron uptake. Furthermore, the genera Azospira and Azospirillum could play a role in the photoelectrotrophic consortium.
    MeSH term(s) Biomass ; Rhodopseudomonas ; Iron/metabolism ; Electricity ; Carbon/metabolism ; Electrodes
    Chemical Substances Iron (E1UOL152H7) ; Carbon (7440-44-0)
    Language English
    Publishing date 2022-12-19
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2406063-X
    ISSN 1751-7915 ; 1751-7915
    ISSN (online) 1751-7915
    ISSN 1751-7915
    DOI 10.1111/1751-7915.14190
    Database MEDical Literature Analysis and Retrieval System OnLINE

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