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      Bidirectional electroactive microbial biofilms and the role of biogenic sulfur in charge storage and release

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          Summary

          The formation of combined electrogenic/electrotrophic biofilms from marine sediments for the development of microbial energy storage systems was studied. Sediment samples from the German coasts of the Baltic and the North Sea were used as inocula for biofilm formation. Anodic biofilm cultivation was applied for a fast and reproducible biofilm formation. North-Sea- and Baltic-Sea-derived biofilms yielded comparable anodic current densities of about 7.2 A m −2. The anodic cultivation was followed by a potential reversal regime, transitioning the electrode potential from 0.2 V to −0.8 V every 2 h to switch between anodic and cathodic conditions. The charge-discharge behavior was studied, revealing an electrochemical conversion of biogenic elemental sulfur as major charge-discharge mechanism. The microbial sequencing revealed strong differences between North- and Baltic-Sea-derived biofilms; however with a large number of known sulfur-converting and electrochemically active bacteria in both biofilms.

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          Highlights

          • Bidirectional electroactive biofilms are cultivated from marine sediments

          • Cultivation is based on anodic growth followed by periodic potential reversal

          • Combined electrogenic and electrotrophic activity is shown

          • Biogenic, elemental sulfur plays a key role in charge storage and release

          Abstract

          Applied microbiology; Microbiofilms; Energy systems; Energy storage

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          Most cited references42

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          APE: Analyses of Phylogenetics and Evolution in R language.

          Analysis of Phylogenetics and Evolution (APE) is a package written in the R language for use in molecular evolution and phylogenetics. APE provides both utility functions for reading and writing data and manipulating phylogenetic trees, as well as several advanced methods for phylogenetic and evolutionary analysis (e.g. comparative and population genetic methods). APE takes advantage of the many R functions for statistics and graphics, and also provides a flexible framework for developing and implementing further statistical methods for the analysis of evolutionary processes. The program is free and available from the official R package archive at http://cran.r-project.org/src/contrib/PACKAGES.html#ape. APE is licensed under the GNU General Public License.
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            Electroactive microorganisms in bioelectrochemical systems

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              msa: an R package for multiple sequence alignment.

              Although the R platform and the add-on packages of the Bioconductor project are widely used in bioinformatics, the standard task of multiple sequence alignment has been neglected so far. The msa package, for the first time, provides a unified R interface to the popular multiple sequence alignment algorithms ClustalW, ClustalOmega and MUSCLE. The package requires no additional software and runs on all major platforms. Moreover, the msa package provides an R interface to the powerful package shade which allows for flexible and customizable plotting of multiple sequence alignments.
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                Author and article information

                Contributors
                Journal
                iScience
                iScience
                iScience
                Elsevier
                2589-0042
                07 July 2021
                20 August 2021
                07 July 2021
                : 24
                : 8
                : 102822
                Affiliations
                [1 ]Institute of Environmental and Sustainable Chemistry, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
                Author notes
                []Corresponding author uwe.schroeder@ 123456tu-braunschweig.de
                [2]

                Lead contact

                Article
                S2589-0042(21)00790-2 102822
                10.1016/j.isci.2021.102822
                8313490
                34337365
                027e5e42-4f4c-4534-b4dc-b44a08fd6882
                © 2021 The Author(s)

                This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

                History
                : 10 May 2021
                : 9 June 2021
                : 2 July 2021
                Categories
                Article

                applied microbiology,microbiofilms,energy systems,energy storage

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