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  • Royal Society of Chemistry  (4)
  • ASLO (Association for the Sciences of Limnology and Oceanography)  (2)
  • American Society of Limnology and Oceanography  (1)
  • 1
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    Heme in the marine environment: from cells to the iron cycle (2014)
    Royal Society of Chemistry
    In:  Metallomics, 6 (1107).
    Details
    Publication Date: 2021-04-23
    Description: Hemes are iron containing heterocyclic molecules important in many cellular processes. In the marine environment, hemes participate as enzymatic cofactors in biogeochemically significant processes like photosynthesis, respiration, and nitrate assimilation. Further, hemoproteins, hemes, and their analogs appear to be iron sources for some marine bacterioplankton under certain conditions. Current oceanographic analytical methodologies allow for the extraction and measurement of heme b from marine material, and a handful of studies have begun to examine the distribution of heme b in ocean basins. The study of heme in the marine environment is still in its infancy, but some trends can be gleaned from the work that has been published so far. In this review, we summarize what is known or might be inferred about the roles of heme in marine microbes as well as the few studies on heme in the marine environment that have been conducted to date. We conclude by presenting some future questions and challenges for the field.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1039/c4mt00031e
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    The association between biogenic and inorganic minerals and the amino acid composition of settling particles (2010)
    ASLO (Association for the Sciences of Limnology and Oceanography)
    In:  Limnology and Oceanography, 55 (5). pp. 2207-2218.
    Details
    Publication Date: 2017-10-24
    Description: To test the hypothesis that calcium carbonate (rather than opal) carries most organic carbon to the deep sea, total hydrolysable amino acid (THAA) analysis was applied to deep-sea (3000 m) sediment trap material from the northeast Atlantic (PAP Site), a variable but intrinsically carbonate-dominated system. THAAs were analyzed in conjunction with total organic carbon, biogenic silica, calcium carbonate, and inferred lithogenic fluxes. The THAA-based degradation state of organic carbon could not be systematically explained by changes in the flux of different mineral phases, which could account for only 16% of the observed variability. In addition amino acid parameters indicative of source organisms indicate that diatom cell walls are an important residual component of organic carbon reaching the deep ocean, a finding supported by comparison with data from previous studies of diverse oceanic environments. Finally, during 2001, very high organic carbon fluxes were associated with elevated lithogenic fluxes and low organic matter degradation relative to surrounding years. In accordance with other recent experimental and observational studies, the data indicate that under specific export scenarios, lithogenic fluxes can act as highly significant mediators of organic carbon transfer to the deep ocean.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.4319/lo.2010.55.5.2207
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Characterization of low molecular weight dissolved organic nitrogen by liquid chromatography-electrospray ionization-mass spectrometry (2009)
    American Society of Limnology and Oceanography
    In:  Limnology and Oceanography: Methods, 7 (1). pp. 52-63.
    Details
    Publication Date: 2017-10-24
    Description: Low molecular weight (LMW; 〈1 kDa) dissolved organic nitrogen ( DON) is the dominant DON fraction in marine systems. However, existing methods for DON characterization exclude this fraction through size exclusion or destruction during sample hydrolysis. In this study, we developed a method for the extraction and analysis of LMW peptides in saline waters. The procedure involves a solid phase extraction (SPE) preconcentration step using a polystyrene-divinylbenzene sorbent, then elution and detection by liquid chromatography-electrospray ionization-mass spectrometry (LC/ESI/MS). The procedure was tested with 1-L water samples containing peptides (10 ng L(-1)) ranging from 188.2-1946.0 Da. The analytes were characterized using "top-down" sequencing to confirm their structure, and the method was then successfully applied to saline water samples extracted from a mono-algal culture of Phaeodactylum tricornutum. This enabled a number of unknown analytes to be partially sequenced (complete sequencing should be possible using additional MS(n) scans and larger sample volumes). The method allows for the detection of peptides at the ng L(-1) level and further preconcentration is possible. The SPE step allowed determination of peptides from saline water, a matrix incompatible with direct LC/MS analysis. The method can, therefore, be used in DON characterization studies.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.4319/lom.2009.7.52
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Electrospray ionisation-mass spectrometry of hydroxamate siderophores (2001)
    Royal Society of Chemistry
    In:  Analyst, 126 (8). pp. 1359-1362.
    Details
    Publication Date: 2017-05-30
    Description: Electrospray ionisation-mass spectrometry (ESI-MS) was applied to the detection of the iron complexes of the hydroxamate type siderophores ferrioxamine (FO), ferrichrome (FC) and iron(iii) rhodotoluate (FR). Mass spectra of the three siderophores produced by ESI-MS were dominated by the protonated (M + 1)(+) parent ions, except for FR at pH 4.3, which was present as the positively charged 1: 1 complex. On collision with He ions, fragmentation proceeded largely via cleavage of C-N bonds. Flow injection analysis of the siderophores with detection by ESI-MS produced detection limits of 1.9 fmol for FO, 31.1 fmol for FC and 524 fmol for FR.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1039/b101268l
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Metal ion-binding properties of phytochelatins and related ligands (2009)
    Royal Society of Chemistry
    In:  In: Metallothioneins and Related Chelators. , ed. by Sigel, A., Sigel, H. and Sigel, R. K. O. Royal Society of Chemistry, Cambridge, UK, pp. 441-482. ISBN 978-1-84755-899-2
    Details
    Publication Date: 2017-10-24
    Type: Book chapter , NonPeerReviewed
    DOI: 10.1039/9781847559531
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    OceanRep: Book chapter
  • 6
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    Metallophores associated with Trichodesmium erythraeum colonies from the Gulf of Aqaba (2019)
    Royal Society of Chemistry
    Details
    Publication Date: 2022-08-09
    Description: Trichodesmium is a globally important marine nitrogen fixing cyanobacteria which forms colonies and utilizes atmospherically derived dust as a source for the limiting micro-nutrient iron. Here we report the identification of metallophores isolated from incubations of natural Trichodesmium colonies collected from the Gulf of Aqaba in the Red Sea. Three of our compounds were identified as the ferrioxamine siderophores B, E, and G. The remaining fifteen metallophores had mass to charge ratios that, to our knowledge, are not common to known siderophores. Putative sum formulas suggest most of these compounds were not structurally related to each other. We also found that the novel metallophores readily formed complexes with aluminium and were less specific for Fe than the ferrioxamines. In our incubations of Trichodesmium colonies, the abundance of ten of the novel metallophores positively correlated with Trichodesmium biomass, but not with bacterial biomass, whilst ferrioxamine siderophores were more strongly associated with bacterial biomass. We identified ferrioxamines and our novel metallophores in filtered surface seawater samples from the Gulf of Aqaba. However, our novel metallophores were only observed in the surface seawater sample collected at the time of highest Trichodesmium abundance, while ferrioxamines were observed even when Trichodesmium was not present. We hypothesize that the novel metallophores were specifically associated with Trichodesmium colonies. Together with the bacterially produced ferrioxamines they likely contribute to a distinctive “ligandosphere” surrounding the Trichodesmium colonies, with potential implications for metal homeostasis within the colony environment.
    Type: Article , PeerReviewed
    Format: text
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    Carbon and alkalinity outwelling across the groundwater‐creek‐shelf continuum off Amazonian mangroves (2021)
    ASLO (Association for the Sciences of Limnology and Oceanography) | Wiley
    Details
    Publication Date: 2024-02-07
    Description: Lateral fluxes (i.e., outwelling) of dissolved organic (DOC) and inorganic (DIC) carbon and total alkalinity were estimated using radium isotopes at the groundwater, mangrove creek, and continental shelf scales in the Amazon region. Observations of salinity and radium isotopes in the creek indicated tidally driven groundwater exchange as the main source of carbon. Radium-derived transport rates indicate that mangrove carbon is exported out of the continental shelf on timescales of 22 ± 7 d. Bicarbonate was the main form (82% ± 11%) of total dissolved carbon in all samples, followed by DOC (13% ± 12%) and CO2 (5% ± 4%). DIC (18.7 ± 15.7 mmol m−2 d−1) exceeded DOC (3.0 ± 4.1 mmol m−2 d−1) outwelling at all spatial scales. The interpretation of outwelling across the mangrove-ocean continuum is related to the spatial and temporal scales investigated. At all scales, outwelling represented a major coastal carbon pathway driving bicarbonate storage in the ocean.
    Type: Article , PeerReviewed
    Format: text
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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