Babbin Andrew R.

No Thumbnail Available
Last Name
Babbin
First Name
Andrew R.
ORCID

Filters

2021 - 2023 4
3 1
4
Reset filters

Settings

Search Results

Now showing 1 - 4 of 4
  • Dataset
    An atlas of depth-gridded and density-gridded interpolated and un-interpolated oxygen deficient zones (ODZs) in the Eastern tropical and subtropical Pacific Ocean
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2021-11-30) Babbin, Andrew R. ; Kwiecinski, Jarek
    This dataset is made up of four NetCDF files, comprising an atlas of depth-gridded and density-gridded interpolated and un-interpolated Pacific oxygen deficient zones. 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/865316
  • Dataset
    Bottle chemistry data from hydrothermal vents sampled by CTD rosette during R/V Atlantis cruise AT37-12 in April and May 2017
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2023-02-21) Babbin, Andrew R. ; Woosley, Ryan ; Cinay, Timur
    The Eastern Tropical North Pacific (ETNP), like the other marine oxygen deficient zones (ODZs), is characterized by an anoxic water column, nitrite accumulation at the anoxic core, and fixed nitrogen loss via nitrite reduction to N2O and N2 gases. Here, we constrain the relative contribution of biogeochemical processes to observable features such as the secondary nitrite maximum (SNM) and local pH maximum by simultaneous measurement of inorganic nitrogen and carbon species. Bottle chemistry data for discrete depths were sampled by CTD rosette from hydrothermal vents in the Eastern Tropical North Pacific during R/V Atlantis cruise AT37-12 in April and May 2017. 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/889539
  • Dataset
    Bottle data and chemical analysis from Falkor cruise FK180624 in the Eastern Tropical North Pacific Ocean in 2018
    (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2021-03-17) Babbin, Andrew R. ; Casciotti, Karen L. ; Woosley, Ryan
    Bottle data and chemical analysis from Falkor cruise FK180624 in the Eastern Tropical North Pacific Ocean in 201 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/832389
  • Article
    Ratio of electron donor to acceptor influences metabolic specialization and denitrification dynamics in Pseudomonas aeruginosa in a mixed carbon medium
    (Frontiers Media, 2021-09-10) Zhang, Irene H. ; Mullen, Susan ; Ciccarese, Davide ; Dumit, Diana ; Martocello, Donald E., III ; Toyofuku, Masanori ; Nomura, Nobuhiko ; Smriga, Steven ; Babbin, Andrew R.
    Denitrifying microbes sequentially reduce nitrate (NO3–) to nitrite (NO2–), NO, N2O, and N2 through enzymes encoded by nar, nir, nor, and nos. Some denitrifiers maintain the whole four-gene pathway, but others possess partial pathways. Partial denitrifiers may evolve through metabolic specialization whereas complete denitrifiers may adapt toward greater metabolic flexibility in nitrogen oxide (NOx–) utilization. Both exist within natural environments, but we lack an understanding of selective pressures driving the evolution toward each lifestyle. Here we investigate differences in growth rate, growth yield, denitrification dynamics, and the extent of intermediate metabolite accumulation under varying nutrient conditions between the model complete denitrifier Pseudomonas aeruginosa and a community of engineered specialists with deletions in the denitrification genes nar or nir. Our results in a mixed carbon medium indicate a growth rate vs. yield tradeoff between complete and partial denitrifiers, which varies with total nutrient availability and ratios of organic carbon to NOx–. We found that the cultures of both complete and partial denitrifiers accumulated nitrite and that the metabolic lifestyle coupled with nutrient conditions are responsible for the extent of nitrite accumulation.