Bayer Barbara

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Bayer
First Name
Barbara
ORCID
0000-0003-3968-5804

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  • Article
    Towards integrating evolution, metabolism, and climate change studies of marine ecosystems
    (Elsevier, 2019-07-24) Baltar, Federico ; Bayer, Barbara ; Bednarsek, Nina ; Deppeler, Stacy ; Escribano, Ruben ; Gonzalez, Carolina E. ; Hansman, Roberta L. ; Mishra, Rajani Kanta ; Moran, Mary Ann ; Repeta, Daniel J. ; Robinson, Carol ; Sintes, Eva ; Tamburini, Christian ; Valentin, Luis E. ; Herndl, Gerhard J.
    Global environmental changes are challenging the structure and functioning of ecosystems. However, a mechanistic understanding of how global environmental changes will affect ecosystems is still lacking. The complex and interacting biological and physical processes spanning vast temporal and spatial scales that constitute an ecosystem make this a formidable problem. A unifying framework based on ecological theory, that considers fundamental and realized niches, combined with metabolic, evolutionary, and climate change studies, is needed to provide the mechanistic understanding required to evaluate and forecast the future of marine communities, ecosystems, and their services.
  • Article
    Complete genome sequences of two phylogenetically distinct Nitrospina strains isolated from the Atlantic and Pacific Oceans
    (American Society for Microbiology, 2022-05-02) Bayer, Barbara ; Kellom, Matthew ; Valois, Frederica ; Waterbury, John B. ; Santoro, Alyson E.
    The complete genome sequences of two chemoautotrophic nitrite-oxidizing bacteria of the genus Nitrospina are reported. Nitrospina gracilis strain Nb-211 was isolated from the Atlantic Ocean, and Nitrospina sp. strain Nb-3 was isolated from the Pacific Ocean. We report two highly similar ~3.07-Mbp genome sequences that differ by the presence of ferric iron chelator (siderophore) biosynthesis genes.
  • Article
    Metabolic versatility of the nitrite-oxidizing bacterium Nitrospira marina and its proteomic response to oxygen-limited conditions
    (Springer Nature, 2020-11-23) Bayer, Barbara ; Saito, Mak A. ; McIlvin, Matthew R. ; Lücker, Sebastian ; Moran, Dawn M. ; Lankiewicz, Thomas S. ; Dupont, Christopher L. ; Santoro, Alyson E.
    The genus Nitrospira is the most widespread group of nitrite-oxidizing bacteria and thrives in diverse natural and engineered ecosystems. Nitrospira marina Nb-295T was isolated from the ocean over 30 years ago; however, its genome has not yet been analyzed. Here, we investigated the metabolic potential of N. marina based on its complete genome sequence and performed physiological experiments to test genome-derived hypotheses. Our data confirm that N. marina benefits from additions of undefined organic carbon substrates, has adaptations to resist oxidative, osmotic, and UV light-induced stress and low dissolved pCO2, and requires exogenous vitamin B12. In addition, N. marina is able to grow chemoorganotrophically on formate, and is thus not an obligate chemolithoautotroph. We further investigated the proteomic response of N. marina to low (∼5.6 µM) O2 concentrations. The abundance of a potentially more efficient CO2-fixing pyruvate:ferredoxin oxidoreductase (POR) complex and a high-affinity cbb3-type terminal oxidase increased under O2 limitation, suggesting a role in sustaining nitrite oxidation-driven autotrophy. This putatively more O2-sensitive POR complex might be protected from oxidative damage by Cu/Zn-binding superoxide dismutase, which also increased in abundance under low O2 conditions. Furthermore, the upregulation of proteins involved in alternative energy metabolisms, including Group 3b [NiFe] hydrogenase and formate dehydrogenase, indicate a high metabolic versatility to survive conditions unfavorable for aerobic nitrite oxidation. In summary, the genome and proteome of the first marine Nitrospira isolate identifies adaptations to life in the oxic ocean and provides insights into the metabolic diversity and niche differentiation of NOB in marine environments.
  • Dataset
    Cellular carbon (C) and nitrogen (N) measurements of marine nitrifiers
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2022-03-17) Bayer, Barbara ; Santoro, Alyson E.
    This dataset contains cellular carbon (C) and nitrogen (N) measurements of marine nitrifiers. These data were generated through experiments conducted at the University of California, Santa Barbara over a period of time from March 2018 to August 2021. For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/871075
  • Dataset
    Dissolved inorganic carbon (DIC) fixation and dissolved organic carbon (DOC) release measurements of marine nitrifier cultures grown under different culture conditions
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2022-03-17) Bayer, Barbara ; Santoro, Alyson E.
    This dataset contains dissolved inorganic carbon (DIC) fixation and dissolved organic carbon (DOC) release measurements of marine nitrifier cultures grown under different culture conditions. These data were generated through experiments conducted at the University of California, Santa Barbara over a period of time from December 2020 to August 2021. For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/870832