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  • 1
    facet.materialart.
    Unknown
    Lipid concentrations, UV radiation doses, and attenuation coefficients in coastal surface waters of West Antarctica (2017)
    PANGAEA
    In:  Supplement to: Collins, James R; Fredricks, Helen F; Bowman, Jeff S; Ward, Collin P; Moreno, Carly; Longnecker, Krista; Marchetti, Adrian; Hansel, Colleen M; Ducklow, Hugh W; Van Mooy, Benjamin A S (2018): The molecular products and biogeochemical significance of lipid photooxidation in West Antarctic surface waters. Geochimica et Cosmochimica Acta, 232, 244-264, https://doi.org/10.1016/j.gca.2018.04.030
    Details
    Publication Date: 2023-01-13
    Description: The seasonal depletion of stratospheric ozone over the Southern Hemisphere allows abnormally high doses of ultraviolet radiation (UVR) to reach surface waters of the West Antarctic Peninsula (WAP) in the austral spring, creating a natural laboratory for the study of lipid photooxidation in the shallow mixed layer of the marginal ice zone. The photooxidation of lipids under such conditions has been identified as a significant source of stress to microorganisms, and short-chain fatty acids altered by photochemical processes have been found in both marine aerosols and sinking marine particle material. However, the biogeochemical impact of lipid photooxidation has not been quantitatively compared at ecosystem scale to the many other biological and abiotic processes that can transform particulate organic matter in the surface ocean. We combined results from field experiments with diverse environmental data, including high-resolution, accurate-mass HPLC-ESI-MS analysis of lipid extracts and in situ measurements of ultraviolet irradiance, to address several unresolved questions about lipid photooxidation in the marine environment. In our experiments, we used liposomes - nonliving, cell-like aggregations of lipids - to examine the photolability of various moieties of the intact polar diacylglycerol (IP-DAG) phosphatidylcholine (PC), a structural component of membranes in a broad range of microorganisms. We observed significant rates of photooxidation only when the molecule contained the polyunsaturated fatty acid (PUFA) docosahexaenoic acid (DHA). As the DHA-containing lipid was oxidized, we observed the steady ingrowth of a diversity of oxylipins and oxidized IP-DAG; our results suggest both the intact IP-DAG the degradation products were amenable to heterotrophic assimilation. To complement our experiments, we used an enhanced version of a new lipidomics discovery software package to identify the lipids in water column samples and in several diatom isolates. The galactolipid digalactosyldiacylglycerol (DGDG), the sulfolipid sulfoquinovosyldiacylglycerol (SQDG) and the phospholipids PC and phosphatidylglycerol (PG) accounted for the majority of IP-DAG in the water column particulate (≥ 0.2 µm) size fraction; between 3.4 and 5.3 % of the IP-DAG contained fatty acids that were both highly polyunsaturated (i.e., each containing ≥ 5 double bonds). Using a broadband apparent quantum yield (AQY) that accounted for direct and Type I (i.e., radical-mediated) photooxidation of PUFA-containing IP-DAG, we estimated that 0.7 ± 0.2 µmol IP-DAG m-2 d-1 (0.5 ± 0.1 mg C m-2 d-1) were oxidized by photochemical processes in the mixed layer. This rate represented 4.4 % (range, 3-21 %) of the mean bacterial production rate measured in the same waters immediately following the retreat of the sea ice. Because our liposome experiments were not designed to account for oxidation by Type II photosensitized processes that often dominate in marine phytodetritus, our rate estimates may represent a sizeable underestimate of the true rate of lipid photooxidation in the water column. While production of such diverse oxidized lipids and oxylipins has been previously observed in terrestrial plants and mammals in response to biological stressors such as disease, we show here that a similar suite of molecules can be produced via an abiotic process in the environment and that the effect can be commensurate in magnitude with other ecosystem-scale biogeochemical processes. This collection includes the following datasets: Daily doses of ultraviolet-B (UVB; 290-315 nm) and ultraviolet-A radiation (UVA; 315-400 nm) recorded in situ at 0.6 m depth at Palmer Station, Antarctica; diffuse downwelling attenuation coefficients in Napierian form for Southern Ocean waters at wavelengths 290-700 nm; concentrations of intact polar diacylglycerol (IP-DAG) lipids measured in cultures of four Antarctic diatom isolates and in water column samples from the Drake Passage and Bellingshausen Sea; transmission spectra from 191-800 nm for various glass and polymer incubation containers; and wavelength-specific molar decadic absorption coefficients of various phosphatidylcholine lipid standards for wavelengths 200-500 nm.
    Type: Dataset
    Format: application/zip, 6 datasets
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 2
    facet.materialart.
    Unknown
    Particulate intact polar diacylglycerol (IP-DAG) lipids measured in water column samples from the Drake Passage and Bellingshausen Sea (2017)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Description: Seawater samples were retrieved from depth using standard oceanographic sampling equipment and then collected by vacuum filtration onto 0.2 µm pore size Durapore membrane filters; these were frozen immediately at -80°C. Extraction was performed using a modified Bligh and Dyer (Bligh and Dyer, 1959; https://doi.org/10.1139/o59-099) method described in Popendorf et al. (2013; https://doi.org/10.1007/s11745-012-3748-0). Lipid extracts were analyzed by HPLC-ESI-MS with data dependent-MS2 acquisition on a high-resolution, accurate mass Thermo Q Exactive Hybrid Quadrupole-Orbitrap mass spectrometer (ThermoFisher Scientific, Waltham, MA, USA) coupled to an Agilent 1200 HPLC system (Agilent, Santa Clara, CA, USA). The HPLC-ESI-MS method is described in Collins et al., 2016 (https://doi.org/10.1021/acs.analchem.6b01260). The LOBSTAHS lipidomics discovery software (Collins et al., 2016; https://doi.org/10.1021/acs.analchem.6b01260) was used to putatively identify HPLC-MS features in the data. We confirmed each LOBSTAHS identification using two additional means: (1) via comparison of data-dependent MS2 spectra with those from authentic standards or published reference spectra and (2) by requiring the presence of the same compound identity in data acquired in the opposite HPLC-ESI-MS ionization mode. We confirmed all LOBSTAHS identities at the lipid class level (e.g., PC versus PE, or MGDG versus TAG) using a new, experimental LOBSTAHS feature which automatically detects diagnostic product ion fragments and constant neutral losses (as given in Popendorf et al., 2013; https://doi.org/10.1007/s11745-012-3748-0) in the available data-dependent MS2 spectra for each sample. After identification, quantification of analytes was performed using a series of standard curves, followed by normalization to concentration of an internal standard. Lipid identities are resolved only to the level of bulk fatty acid composition (i.e., the sum of the properties of the substituents at both the sn-1 and sn-2 positions). As a result, in some cases (e.g., DGTS_DGTA 32:1), several different molecules having the same bulk fatty acid composition have been identified. These can be distinguished by retention time, which is given in the "Comment" field for each entry.
    Keywords: 33LG20140101; Bellingshausen Sea; Bottle, Niskin 5-L; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 26:0; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 27:0; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 28:0; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 28:1; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 29:0; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 30:1; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 30:2; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 31:1; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 32:1; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 32:4; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 32:5; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 33:6; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 34:2; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 34:3; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 34:4; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 34:5; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 35:0; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 36:3; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 36:4; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 36:5; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 36:6; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 36:8; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 36:9; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 37:5; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 38:10; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 38:4; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 38:5; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 38:6; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 38:9; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 40:10; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 40:11; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 40:7; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 42:11; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 42:7; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 44:12; Digalactosyldiacylglycerol 30:0; Digalactosyldiacylglycerol 30:1; Digalactosyldiacylglycerol 30:2; Digalactosyldiacylglycerol 30:4; Digalactosyldiacylglycerol 32:1; Digalactosyldiacylglycerol 32:2; Digalactosyldiacylglycerol 32:3; Digalactosyldiacylglycerol 32:4; Digalactosyldiacylglycerol 32:5; Digalactosyldiacylglycerol 32:6; Digalactosyldiacylglycerol 32:7; Digalactosyldiacylglycerol 32:8; Digalactosyldiacylglycerol 34:1; Digalactosyldiacylglycerol 34:2; Digalactosyldiacylglycerol 34:3; Digalactosyldiacylglycerol 34:4; Digalactosyldiacylglycerol 34:5; Digalactosyldiacylglycerol 34:6; Digalactosyldiacylglycerol 34:7; Digalactosyldiacylglycerol 34:8; Digalactosyldiacylglycerol 34:9; Digalactosyldiacylglycerol 36:10; Digalactosyldiacylglycerol 36:4; Digalactosyldiacylglycerol 36:5; Digalactosyldiacylglycerol 36:6; Digalactosyldiacylglycerol 36:7; Digalactosyldiacylglycerol 36:8; Digalactosyldiacylglycerol 36:9; Digalactosyldiacylglycerol 38:9; Drake Passage; Event label; Latitude of event; Laurence M. Gould; LMG14-01; LMG14-01-CTD006-10; LMG14-01-CTD027-0; LMG14-01-CTD027-10; LMG14-01-CTD027-20; Longitude of event; Monogalactosyldiacylglycerol 28:0; Monogalactosyldiacylglycerol 30:0; Monogalactosyldiacylglycerol 30:1; Monogalactosyldiacylglycerol 30:2; Monogalactosyldiacylglycerol 30:3; Monogalactosyldiacylglycerol 30:4; Monogalactosyldiacylglycerol 30:5; Monogalactosyldiacylglycerol 31:3; Monogalactosyldiacylglycerol 32:0; Monogalactosyldiacylglycerol 32:1; Monogalactosyldiacylglycerol 32:2; Monogalactosyldiacylglycerol 32:3; Monogalactosyldiacylglycerol 32:4; Monogalactosyldiacylglycerol 32:5; Monogalactosyldiacylglycerol 32:6; Monogalactosyldiacylglycerol 32:7; Monogalactosyldiacylglycerol 32:8; Monogalactosyldiacylglycerol 34:1; Monogalactosyldiacylglycerol 34:2; Monogalactosyldiacylglycerol 34:3; Monogalactosyldiacylglycerol 34:4; Monogalactosyldiacylglycerol 34:5; Monogalactosyldiacylglycerol 34:6; Monogalactosyldiacylglycerol 34:7; Monogalactosyldiacylglycerol 34:8; Monogalactosyldiacylglycerol 34:9; Monogalactosyldiacylglycerol 36:10; Monogalactosyldiacylglycerol 36:2; Monogalactosyldiacylglycerol 36:3; Monogalactosyldiacylglycerol 36:6; Monogalactosyldiacylglycerol 36:7; Monogalactosyldiacylglycerol 36:8; Monogalactosyldiacylglycerol 36:9; Monogalactosyldiacylglycerol 38:10; Monogalactosyldiacylglycerol 38:7; Monogalactosyldiacylglycerol 38:8; Monogalactosyldiacylglycerol 38:9; Monogalactosyldiacylglycerol 40:10; Monogalactosyldiacylglycerol 40:2; Monogalactosyldiacylglycerol 43:2; Monogalactosyldiacylglycerol 44:2; Monogalactosyldiacylglycerol 46:7; Monogalactosyldiacylglycerol 47:3; Monogalactosyldiacylglycerol 48:8; Monogalactosyldiacylglycerol 50:3; Monogalactosyldiacylglycerol 52:3; NIS_5L; PAL1314-39-E-3; Phosphatidylcholine 27:1; Phosphatidylcholine 28:1; Phosphatidylcholine 29:0; Phosphatidylcholine 29:1; Phosphatidylcholine 30:0; Phosphatidylcholine 30:1; Phosphatidylcholine 30:4; Phosphatidylcholine 31:2; Phosphatidylcholine 31:3; Phosphatidylcholine 32:2; Phosphatidylcholine 34:1; Phosphatidylcholine 34:2; Phosphatidylcholine 34:3; Phosphatidylcholine 34:4; Phosphatidylcholine 34:5; Phosphatidylcholine 34:8; Phosphatidylcholine 36:10; Phosphatidylcholine 36:2; Phosphatidylcholine 36:3; Phosphatidylcholine 36:4; Phosphatidylcholine 36:5; Phosphatidylcholine 36:6; Phosphatidylcholine 36:7; Phosphatidylcholine 36:9; Phosphatidylcholine 37:4; Phosphatidylcholine 37:6; Phosphatidylcholine 38:1; Phosphatidylcholine 38:10; Phosphatidylcholine 38:5; Phosphatidylcholine 38:6; Phosphatidylcholine 38:7; Phosphatidylcholine 38:8; Phosphatidylcholine 38:9; Phosphatidylcholine 40:10; Phosphatidylcholine 40:11; Phosphatidylcholine 40:5; Phosphatidylcholine 40:6; Phosphatidylcholine 40:7; Phosphatidylcholine 40:8; Phosphatidylcholine 40:9; Phosphatidylcholine 42:10; Phosphatidylcholine 42:11; Phosphatidylcholine 42:6; Phosphatidylcholine 44:12; Phosphatidylethanolamine 26:0; Phosphatidylethanolamine 27:0; Phosphatidylethanolamine 28:0; Phosphatidylethanolamine 29:0; Phosphatidylethanolamine 29:1; Phosphatidylethanolamine 30:0; Phosphatidylethanolamine 30:1; Phosphatidylethanolamine 30:2; Phosphatidylethanolamine 31:1; Phosphatidylethanolamine 32:0; Phosphatidylethanolamine 32:1; Phosphatidylethanolamine 32:2; Phosphatidylethanolamine 32:3; Phosphatidylethanolamine 32:4; Phosphatidylethanolamine 33:6; Phosphatidylethanolamine 34:1; Phosphatidylethanolamine 34:2; Phosphatidylethanolamine 34:4;
    Type: Dataset
    Format: text/tab-separated-values, 1562 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 3
    facet.materialart.
    Unknown
    Intact polar diacylglycerol (IP-DAG) lipids measured in cultures of four Antarctic diatom isolates (2017)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Description: Diatoms were isolated by Adrian Marchetti (http://orcid.org/0000-0003-4608-4775) from waters of the Bellingshausen Sea and grown on replete media. Cells were collected onto 0.7 µm GF/F filters. Extraction was performed using a modified Bligh and Dyer (Bligh and Dyer, 1959; https://doi.org/10.1139/o59-099) method described in Popendorf et al. (2013; https://doi.org/10.1007/s11745-012-3748-0). Lipid extracts were analyzed by HPLC-ESI-MS with data dependent-MS2 acquisition on a high-resolution, accurate mass Thermo Q Exactive Hybrid Quadrupole-Orbitrap mass spectrometer (ThermoFisher Scientific, Waltham, MA, USA) coupled to an Agilent 1200 HPLC system (Agilent, Santa Clara, CA, USA). The HPLC-ESI-MS method is described in Collins et al., 2016 (https://doi.org/10.1021/acs.analchem.6b01260). The LOBSTAHS lipidomics discovery software (Collins et al., 2016; https://doi.org/10.1021/acs.analchem.6b01260) was used to putatively identify HPLC-MS features in the data. We confirmed each LOBSTAHS identification using two additional means: (1) via comparison of data-dependent MS2 spectra with those from authentic standards or published reference spectra and (2) by requiring the presence of the same compound identity in data acquired in the opposite HPLC-ESI-MS ionization mode. We confirmed all LOBSTAHS identities at the lipid class level (e.g., PC versus PE, or MGDG versus TAG) using a new, experimental LOBSTAHS feature which automatically detects diagnostic product ion fragments and constant neutral losses (as given in Popendorf et al., 2013; https://doi.org/10.1007/s11745-012-3748-0) in the available data-dependent MS2 spectra for each sample. After identification, quantification of analytes was performed using a series of standard curves, followed by normalization to concentration of an internal standard. Lipid identities are resolved only to the level of bulk fatty acid composition (i.e., the sum of the properties of the substituents at both the sn-1 and sn-2 positions). As a result, in some cases (e.g., PC 40:8), several different molecules having the same bulk fatty acid composition have been identified. These can be distinguished by retention time, which is given in the "Comment" field for each entry.
    Keywords: Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 30:0; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 30:1; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 32:2; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 33:5; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 34:5; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 36:6; Diacylglyceryl trimethylhomoserine and diacylglyceryl hydroxymethyl-trimethyl-beta-alanine 40:10; Digalactosyldiacylglycerol 30:0; Digalactosyldiacylglycerol 30:1; Digalactosyldiacylglycerol 30:2; Digalactosyldiacylglycerol 30:4; Digalactosyldiacylglycerol 31:3; Digalactosyldiacylglycerol 32:1; Digalactosyldiacylglycerol 32:2; Digalactosyldiacylglycerol 32:3; Digalactosyldiacylglycerol 32:4; Digalactosyldiacylglycerol 32:5; Digalactosyldiacylglycerol 32:6; Digalactosyldiacylglycerol 32:7; Digalactosyldiacylglycerol 34:2; Digalactosyldiacylglycerol 34:3; Digalactosyldiacylglycerol 34:6; Digalactosyldiacylglycerol 34:7; Digalactosyldiacylglycerol 36:2; Digalactosyldiacylglycerol 36:4; Digalactosyldiacylglycerol 36:5; Digalactosyldiacylglycerol 36:6; Digalactosyldiacylglycerol 36:7; Digalactosyldiacylglycerol 36:8; Digalactosyldiacylglycerol 36:9; Digalactosyldiacylglycerol 37:8; Digalactosyldiacylglycerol 38:9; Monitoring station; Monogalactosyldiacylglycerol 30:0; Monogalactosyldiacylglycerol 30:1; Monogalactosyldiacylglycerol 30:2; Monogalactosyldiacylglycerol 30:3; Monogalactosyldiacylglycerol 30:4; Monogalactosyldiacylglycerol 32:0; Monogalactosyldiacylglycerol 32:1; Monogalactosyldiacylglycerol 32:2; Monogalactosyldiacylglycerol 32:3; Monogalactosyldiacylglycerol 32:4; Monogalactosyldiacylglycerol 32:5; Monogalactosyldiacylglycerol 32:6; Monogalactosyldiacylglycerol 32:7; Monogalactosyldiacylglycerol 32:8; Monogalactosyldiacylglycerol 34:0; Monogalactosyldiacylglycerol 34:1; Monogalactosyldiacylglycerol 34:2; Monogalactosyldiacylglycerol 34:3; Monogalactosyldiacylglycerol 34:4; Monogalactosyldiacylglycerol 34:5; Monogalactosyldiacylglycerol 34:6; Monogalactosyldiacylglycerol 34:7; Monogalactosyldiacylglycerol 34:8; Monogalactosyldiacylglycerol 36:10; Monogalactosyldiacylglycerol 36:5; Monogalactosyldiacylglycerol 36:6; Monogalactosyldiacylglycerol 36:7; Monogalactosyldiacylglycerol 36:8; Monogalactosyldiacylglycerol 36:9; Monogalactosyldiacylglycerol 38:10; Monogalactosyldiacylglycerol 38:3; Monogalactosyldiacylglycerol 38:7; Monogalactosyldiacylglycerol 38:8; Monogalactosyldiacylglycerol 38:9; Monogalactosyldiacylglycerol 40:10; Monogalactosyldiacylglycerol 40:4; Monogalactosyldiacylglycerol 40:8; Monogalactosyldiacylglycerol 40:9; Monogalactosyldiacylglycerol 42:10; Monogalactosyldiacylglycerol 42:11; Monogalactosyldiacylglycerol 42:2; Monogalactosyldiacylglycerol 42:3; Monogalactosyldiacylglycerol 42:4; Monogalactosyldiacylglycerol 44:10; Monogalactosyldiacylglycerol 44:12; Monogalactosyldiacylglycerol 44:3; Monogalactosyldiacylglycerol 44:4; Monogalactosyldiacylglycerol 44:5; Monogalactosyldiacylglycerol 44:6; MONS; Palmer_station; Phosphatidylcholine 28:0; Phosphatidylcholine 30:0; Phosphatidylcholine 30:1; Phosphatidylcholine 30:2; Phosphatidylcholine 30:3; Phosphatidylcholine 32:0; Phosphatidylcholine 32:1; Phosphatidylcholine 32:2; Phosphatidylcholine 32:3; Phosphatidylcholine 32:4; Phosphatidylcholine 32:5; Phosphatidylcholine 32:7; Phosphatidylcholine 32:8; Phosphatidylcholine 33:5; Phosphatidylcholine 34:1; Phosphatidylcholine 34:2; Phosphatidylcholine 34:3; Phosphatidylcholine 34:4; Phosphatidylcholine 34:5; Phosphatidylcholine 34:6; Phosphatidylcholine 34:7; Phosphatidylcholine 34:8; Phosphatidylcholine 35:4; Phosphatidylcholine 35:6; Phosphatidylcholine 36:2; Phosphatidylcholine 36:3; Phosphatidylcholine 36:4; Phosphatidylcholine 36:5; Phosphatidylcholine 36:6; Phosphatidylcholine 36:7; Phosphatidylcholine 36:8; Phosphatidylcholine 36:9; Phosphatidylcholine 37:2; Phosphatidylcholine 37:6; Phosphatidylcholine 38:10; Phosphatidylcholine 38:2; Phosphatidylcholine 38:5; Phosphatidylcholine 38:6; Phosphatidylcholine 38:7; Phosphatidylcholine 38:8; Phosphatidylcholine 38:9; Phosphatidylcholine 39:7; Phosphatidylcholine 40:10; Phosphatidylcholine 40:7; Phosphatidylcholine 40:8; Phosphatidylcholine 40:9; Phosphatidylcholine 42:10; Phosphatidylcholine 42:11; Phosphatidylcholine 42:9; Phosphatidylcholine 44:10; Phosphatidylcholine 44:12; Phosphatidylethanolamine 29:0; Phosphatidylethanolamine 30:0; Phosphatidylethanolamine 30:1; Phosphatidylethanolamine 30:2; Phosphatidylethanolamine 30:3; Phosphatidylethanolamine 31:0; Phosphatidylethanolamine 31:1; Phosphatidylethanolamine 31:2; Phosphatidylethanolamine 31:3; Phosphatidylethanolamine 31:4; Phosphatidylethanolamine 32:0; Phosphatidylethanolamine 32:1; Phosphatidylethanolamine 32:2; Phosphatidylethanolamine 32:3; Phosphatidylethanolamine 32:4; Phosphatidylethanolamine 33:0; Phosphatidylethanolamine 33:1; Phosphatidylethanolamine 33:2; Phosphatidylethanolamine 33:4; Phosphatidylethanolamine 33:5; Phosphatidylethanolamine 34:1; Phosphatidylethanolamine 34:2; Phosphatidylethanolamine 34:3; Phosphatidylethanolamine 34:4; Phosphatidylethanolamine 34:5; Phosphatidylethanolamine 34:6; Phosphatidylethanolamine 35:5; Phosphatidylethanolamine 35:6; Phosphatidylethanolamine 36:2; Phosphatidylethanolamine 36:3; Phosphatidylethanolamine 36:7; Phosphatidylethanolamine 36:9; Phosphatidylethanolamine 38:8; Phosphatidylethanolamine 38:9; Phosphatidylethanolamine 40:10; Phosphatidylethanolamine 40:9; Phosphatidylethanolamine 42:11; Phosphatidylethanolamine 42:3; Phosphatidylethanolamine 44:9; Phosphatidylglycerol 28:0; Phosphatidylglycerol 29:0; Phosphatidylglycerol 30:0; Phosphatidylglycerol 30:1; Phosphatidylglycerol 30:2; Phosphatidylglycerol 30:3; Phosphatidylglycerol 30:4; Phosphatidylglycerol 31:0; Phosphatidylglycerol 31:2; Phosphatidylglycerol 32:0; Phosphatidylglycerol 32:1; Phosphatidylglycerol 32:2; Phosphatidylglycerol 32:3; Phosphatidylglycerol 32:4; Phosphatidylglycerol 32:5; Phosphatidylglycerol 32:6; Phosphatidylglycerol 32:7; Phosphatidylglycerol 32:8; Phosphatidylglycerol 33:2; Phosphatidylglycerol 33:4; Phosphatidylglycerol 34:0; Phosphatidylglycerol 34:2; Phosphatidylglycerol 34:3; Phosphatidylglycerol 34:5; Phosphatidylglycerol 34:6; Phosphatidylglycerol 34:7; Phosphatidylglycerol 34:8; Phosphatidylglycerol 34:9; Phosphatidylglycerol 36:2; Phosphatidylglycerol 36:5; Phosphatidylglycerol 36:6; Phosphatidylglycerol 36:7; Phosphatidylglycerol 37:2; Phosphatidylglycerol 38:10; Phosphatidylglycerol 40:10; Phosphatidylglycerol 40:8; Phosphatidylglycerol 42:11; Phosphatidylglycerol 44:12; Species; Strain; Sulfoquinovosyldiacylglycerol 28:0; Sulfoquinovosyldiacylglycerol 29:0; Sulfoquinovosyldiacylglycerol 30:0; Sulfoquinovosyldiacylglycerol 30:1; Sulfoquinovosyldiacylglycerol 30:2; Sulfoquinovosyldiacylglycerol 30:3; Sulfoquinovosyldiacylglycerol 30:4; Sulfoquinovosyldiacylglycerol 31:0; Sulfoquinovosyldiacylglycerol 31:1; Sulfoquinovosyldiacylglycerol 31:3; Sulfoquinovosyldiacylglycerol 31:4; Sulfoquinovosyldiacylglycerol 32:0; Sulfoquinovosyldiacylglycerol 32:1; Sulfoquinovosyldiacylglycerol 32:2; Sulfoquinovosyldiacylglycerol 32:3; Sulfoquinovosyldiacylglycerol 32:4; Sulfoquinovosyldiacylglycerol 32:5; Sulfoquinovosyldiacylglycerol 32:6; Sulfoquinovosyldiacylglycerol 32:7; Sulfoquinovosyldiacylglycerol 33:1; Sulfoquinovosyldiacylglycerol 33:3; Sulfoquinovosyldiacylglycerol 33:4; Sulfoquinovosyldiacylglycerol 33:5; Sulfoquinovosyldiacylglycerol 34:0; Sulfoquinovosyldiacylglycerol 34:1; Sulfoquinovosyldiacylglycerol 34:2; Sulfoquinovosyldiacylglycerol 34:3; Sulfoquinovosyldiacylglycerol 34:4; Sulfoquinovosyldiacylglycerol 34:5; Sulfoquinovosyldiacylglycerol 34:6; Sulfoquinovosyldiacylglycerol 34:7;
    Type: Dataset
    Format: text/tab-separated-values, 1251 data points
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  • 4
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    Transmission spectra from 191-800 nm for various glass and polymer incubation containers (2017)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Description: Transmission spectra from 191-800 nm for various glass and polymer incubation containers acquired using a Thermo Evolution 300 benchtop spectrophotometer. Spectra are reported for passage of light through single thicknesses of fused quartz glass, borosilicate glass, polyvinylfluoride film (PVF, sold under the brand name Tedlar), 4 mil thickness polyethylene terephthalate film (PET, sold under the brand name Mylar), and for passage through both PVF and PET films together. Transmission spectra are reported as percentages.
    Keywords: Monitoring station; MONS; Palmer_station; Transmission of light; Wavelength
    Type: Dataset
    Format: text/tab-separated-values, 18258 data points
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  • 5
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    Wavelength-specific molar decadic absorption coefficients of various phosphatidylcholine lipid standards for wavelengths 200-500 nm (2017)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Description: Wavelength-specific molar decadic absorption coefficients of various phosphatidylcholine lipid standards for wavelengths 200-500 nm. Lipids were dissolved in methanol and wavelength-specific absorbances were measured in 100 mm quartz cuvettes using a dual-path UV-visible spectrophotometer (Thermo Nicolet Evolution 300; ThermoFisher Scientific).
    Keywords: Molar attenuation coefficient; Monitoring station; MONS; Palmer_station; UV-visible spectrophotometer (Thermo Nicolet Evolution 300, ThermoFisher); Wavelength
    Type: Dataset
    Format: text/tab-separated-values, 7505 data points
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  • 6
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    Daily underwater doses of ultraviolet-B (290-315 nm) and ultraviolet-A radiation (315-400 nm) at Palmer Station, Antarctica (2017)
    PANGAEA
    Details
    Publication Date: 2023-11-10
    Description: Doses were calculated from continuous in situ irradiance observations made with an Ocean Optics Jaz spectrophotometer (ILX-511B detector; Ocean Optics Inc., Dunedin, FL, USA). Incident irradiances were recorded at 0.3 nm bandwidth using an upward-facing plane irradiance cosine corrector (180° field of view) and 10 m fiber optic cable. The instrument was factory calibrated prior to deployment for absolute irradiance measurements from 210-850 nm. Irradiances were recorded at 1 min. intervals. These in situ daily doses may be compared to incident daily UV doses recorded as part of the U.S. National Oceanic and Atmospheric Administration's (NOAA) Antarctic UV Monitoring Network; the NOAA dosage data are available at https://www.esrl.noaa.gov/gmd/grad/antuv/
    Keywords: DATE/TIME; DEPTH, water; Monitoring station; MONS; Palmer_station; Ultraviolet-a radiation, dose daily; Ultraviolet-b radiation, dose daily
    Type: Dataset
    Format: text/tab-separated-values, 70 data points
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  • 7
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    Diffuse downwelling attenuation coefficients for Southern Ocean waters for wavelengths 290-700 nm (2018)
    PANGAEA
    Details
    Publication Date: 2024-02-16
    Description: Diffuse downwelling attenuation coefficients in Napierian form (DAC down) for Southern Ocean waters for wavelengths 290-700 nm. Coefficients for 320-700 nm were calculated directly from depth profiles of in situ irradiance made with an Ocean Optics Jaz spectrophotometer at PAL-LTER Station B, Arthur Harbor, Antarctica. The station is a 75 m deep sampling location about 1 km offshore. Due to the low signal-to-noise ratio in the in situ irradiance observations at wavelengths 〈 320 nm, coefficients were estimated for 290-320 nm using an exponential model fit to observed data from the 320-370 nm interval: DAC down =e^(-0.0149 * lamda+3.60) To achieve minimum boat shadow while making the irradiance profile measurements, the fiber optic cable and light sensor (cosine corrector) were streamed away from the small boat in a direction that was both to windward and toward the sun; the boat was then allowed to drift downwind from the measurement location to a suitable stand-off distance. A series of concurrent surface irradiance measurements made with a LI-COR PAR sensor (model LI-193SA; LI-COR Biosciences, Lincoln, NE, USA) was used to correct the spectra made as part of these profiles for any changes in incident light intensity that occurred between measurements.
    Keywords: Arthur Harbour, Antarctica; Diffuse attenuation coefficient, downward; Diffuse attenuation coefficient, downward, standard deviation; Monitoring station; MONS; Palmer_StationB; Wavelength
    Type: Dataset
    Format: text/tab-separated-values, 3577 data points
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  • 8
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    Unknown
    Diffuse downwelling attenuation coefficients (Napierian) for Southern Ocean waters for wavelengths 290-700 nm (2017)
    PANGAEA
    Details
    Publication Date: 2024-02-16
    Description: Diffuse downwelling attenuation coefficients in Napierian form (DAC down) for Southern Ocean waters for wavelengths 290-700 nm. Coefficients for 320-700 nm were calculated directly from depth profiles of in situ irradiance made with an Ocean Optics Jaz spectrophotometer at PAL-LTER Station B, Arthur Harbor, Antarctica. The station is a 75 m deep sampling location about 1 km offshore. Due to the low signal-to-noise ratio in the in situ irradiance observations at wavelengths 〈 320 nm, coefficients were estimated for 290-320 nm using an exponential model fit to observed data from the 320-370 nm interval: DAC down =e^(-0.0152 * lamda+3.84) To achieve minimum boat shadow while making the irradiance profile measurements, the fiber optic cable and light sensor (cosine corrector) were streamed away from the small boat in a direction that was both to windward and toward the sun; the boat was then allowed to drift downwind from the measurement location to a suitable stand-off distance. A series of concurrent surface irradiance measurements made with a LI-COR PAR sensor (model LI-193SA; LI-COR Biosciences, Lincoln, NE, USA) was used to correct the spectra made as part of these profiles for any changes in incident light intensity that occurred between measurements.
    Keywords: Arthur Harbour, Antarctica; Diffuse attenuation coefficient, downward; Monitoring station; MONS; Palmer_StationB; Wavelength
    Type: Dataset
    Format: text/tab-separated-values, 2477 data points
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  • 9
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    Unknown
    Dose-dependent regulation of microbial activity on sinking particles by polyunsaturated aldehydes: Implications for the carbon cycle (2015)
    National Academy of Sciences
    Details
    Publication Date: 2015-04-27
    Description: Diatoms and other phytoplankton play a crucial role in the global carbon cycle, fixing CO2into organic carbon, which may then be exported to depth via sinking particles. The molecular diversity of this organic carbon is vast and many highly bioactive molecules have been identified. Polyunsaturated aldehydes (PUAs) are bioactive on various levels of the marine food web, and yet the potential for these molecules to affect the fate of organic carbon produced by diatoms remains an open question. In this study, the effects of PUAs on the natural microbial assemblages associated with sinking particles were investigated. Sinking particles were collected from 150 m in the water column and exposed to varying concentrations of PUAs in dark incubations over 24 h. PUA doses ranging from 1 to 10 µM stimulated respiration, organic matter hydrolysis, and cell growth by bacteria associated with sinking particles. PUA dosages near 100 µM appeared to be toxic, resulting in decreased bacterial cell abundance and metabolism, as well as pronounced shifts in bacterial community composition. Sinking particles were hot spots for PUA production that contained concentrations within the stimulatory micromolar range in contrast to previously reported picomolar concentrations of these compounds in bulk seawater. This suggests PUAs produced in situ stimulate the remineralization of phytoplankton-derived sinking organic matter, decreasing carbon export efficiency, and shoaling the average depths of nutrient regeneration. Our results are consistent with a “bioactivity hypothesis” for explaining variations in carbon export efficiency in the oceans.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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    Synthesis of high molar activity 33P-labeled phosphorous acid (2019)
    Springer
    Details
    Publication Date: 2019-05-11
    Print ISSN: 0236-5731
    Electronic ISSN: 1588-2780
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Published by Springer
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