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  • 1
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    Untargeted mass spectrometry-based metabolomics approach unveils molecular changes in raw and processed foods and beverages (2020)
    Elsevier
    In:  Food Chemistry, 302 . p. 125290.
    Details
    Publication Date: 2021-01-08
    Description: n our daily lives, we consume foods that have been transported, stored, prepared, cooked, or otherwise processed by ourselves or others. Food storage and preparation have drastic effects on the chemical composition of foods. Untargeted mass spectrometry analysis of food samples has the potential to increase our chemical understanding of these processes by detecting a broad spectrum of chemicals. We performed a time-based analysis of the chemical changes in foods during common preparations, such as fermentation, brewing, and ripening, using untargeted mass spectrometry and molecular networking. The data analysis workflow presented implements an approach to study changes in food chemistry that can reveal global alterations in chemical profiles, identify changes in abundance, as well as identify specific chemicals and their transformation products. The data generated in this study are publicly available, enabling the replication and re-analysis of these data in isolation, and serve as a baseline dataset for future investigations.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.foodchem.2019.125290
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Short-term dynamics of North Sea bacterioplankton-dissolved organic matter coherence on molecular level (2016)
    In:  EPIC3Frontiers Microbiology
    Details
    Publication Date: 2018-02-16
    Description: Remineralisation and transformation of dissolved organic matter (DOM) by marine microbes shape the DOM composition and thus, have large impact on global carbon and nutrient cycling. However, information on bacterioplankton-DOM interactions on a molecular level is limited. We examined the variation of bacterial community composition at Helgoland Roads (North Sea) in relation to variation of molecular DOM composition and various environmental parameters on short-time scales. Surface water samples were taken daily over a period of twenty days. Bacterial community and molecular DOM composition were assessed via 16S rRNA gene tag sequencing and ultrahigh resolution Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR-MS), respectively. Environmental conditions were driven by a coastal water influx during the first half of the sampling period and the onset of a summer phytoplankton bloom towards the end of the sampling period. These phenomena led to a distinct grouping of bacterial communities and DOM composition which was particularly influenced by total dissolved nitrogen concentration, temperature and salinity, as revealed by distance-based linear regression analyses. Bacterioplankton-DOM interaction was demonstrated in strong correlations between specific bacterial taxa and particular DOM molecules, thus, suggesting potential specialization on particular substrates. We propose that a combination of high resolution techniques, as used in this study, may provide substantial information on substrate generalists and specialists and thus, contribute to prediction of bacterial community composition variation.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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    PAPER (OA)
  • 3
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    Short-term dynamics of dissolved organic matter and bacterial communities in the open North Sea off Helgoland Island (2013)
    In:  EPIC330 p.
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Thesis , notRev
    Format: application/pdf
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  • 4
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    Substantial oxygen consumption by aerobic nitrite oxidation in oceanic oxygen minimum zones (2022)
    Nature Research
    Details
    Publication Date: 2022-05-27
    Description: © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Beman, J. M., Vargas, S. M., Wilson, J. M., Perez-Coronel, E., Karolewski, J. S., Vazquez, S., Yu, A., Cairo, A. E., White, M. E., Koester, I., Aluwihare, L. I., & Wankel, S. D. Substantial oxygen consumption by aerobic nitrite oxidation in oceanic oxygen minimum zones. Nature Communications, 12(1), (2021): 7043, https://doi.org/10.1038/s41467-021-27381-7.
    Description: Oceanic oxygen minimum zones (OMZs) are globally significant sites of biogeochemical cycling where microorganisms deplete dissolved oxygen (DO) to concentrations 〈20 µM. Amid intense competition for DO in these metabolically challenging environments, aerobic nitrite oxidation may consume significant amounts of DO and help maintain low DO concentrations, but this remains unquantified. Using parallel measurements of oxygen consumption rates and 15N-nitrite oxidation rates applied to both water column profiles and oxygen manipulation experiments, we show that the contribution of nitrite oxidation to overall DO consumption systematically increases as DO declines below 2 µM. Nitrite oxidation can account for all DO consumption only under DO concentrations 〈393 nM found in and below the secondary chlorophyll maximum. These patterns are consistent across sampling stations and experiments, reflecting coupling between nitrate reduction and nitrite-oxidizing Nitrospina with high oxygen affinity (based on isotopic and omic data). Collectively our results demonstrate that nitrite oxidation plays a pivotal role in the maintenance and biogeochemical dynamics of OMZs.
    Description: This work was supported by NSF CAREER Grant OCE-1555375 to J.M.B. Metagenome sequencing was supported by the UCMEXUS-CONACyT Collaborative Grants Program (joint awards to J.M.B. and José García Maldonado).
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 5
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    Short-term Dynamics of Dissolved Organic Matter and Bacterial Communities (2013)
    In:  EPIC3Youmares 2013, Oldenburg Germany, 2013-09-11-2013-09-13
    Details
    Publication Date: 2022-09-29
    Description: Dissolved organic matter (DOM) in the ocean is one of the largest carbon pools on earth, similar in size to atmospheric CO2. Due to its richness in energy and nutrients it is fundamental for marine food webs and for microbial life. The microbial loop is an essential compartment in the global carbon cycle and is important for the transformation and recycling of organic matter and nutrients in the oceans. Microbial communities shape the molecular composition of DOM and vice versa. Earlier studies have shown that seasonal dynamics in DOM composition and microbial communities exist. A central aim of the study was to explore and characterize variations in composition of bacterial communities and DOM over much shorter periods of time, ranging from hours to days. Results revealed that there was no relation between the composition of DOM and the bacterial community neither in daily sampling nor in hourly sampling. Two significantly different sample groups were distinguishable in both daily and hourly sets of samples of bacterial communities and molecular DOM composition. In contrast DOM samples taken hourly did not group significantly. Multivariate statistics (dbRDA) reveal that variations in bacterial community and DOM composition are mainly driven by salinity changes. we therfore conclude that salinity and molecules typical for marine and terrestrial organic matter are significantly correlated. Further information on bacterial community structure will be available through sequencing of bacterial DNA.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
    Format: application/pdf
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