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  • 1
    Electronic Resource
    Electronic Resource
    Isolation of Marine Dissolved Organic Matter: Evaluation of Sequential Combinations of XAD Resins 2, 4, and 7 (1994)
    s.l. : American Chemical Society
    Analytical chemistry 66 (1994), S. 2417-2419 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00086a032
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Differences in osmoacclimation between sporophytes and gametophytes of the brown alga Ectocarpus siliculosus (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 83 (1991), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The osmoacclimation of Ectocarpus siliculosus isolates known to have different salt tolerances was investigated. Included were isolates originating from 5 different locations in the northern hemisphere, and sporophyte and gametophyte phases of different ploidy from two of the locations were compared. The effect of salinity treatment (8–64%0) on inorganic ions (K+, Na+, Mg2+, Cl−, SO2−4, phosphate) and the low molecular weight carbohydrate mannitol was measured, together with complimentary measurements of cell viability. Very different responses between isolates were obtained, both between isolates of different geographic origin and between sporophytes and gametophytes from the same parent material. A similarity in response between haploid and diploid gametophytes, and diploid and triploid sporophytes indicates that physiological differences between gametophyte and sporophyte generations are not necessarily based on ploidy changes alone. There were no identifiable differences in the responses of male and female gametophytes. K+ is the major osmolyte within the species, and differences in the regulation of K+ largely account for the observed variation in osmoacclimation, both between life history phases and between isolates from different localities. Isolates with broader salt tolerances had the higher concentrations of mannitol. There were differences between isolates in the amounts and regulation of Cl− and phosphate, the latter being present in unusually high concentrations. There were also isolate differences in the concentrations of Mg2+ and SO2−4, although these divalent ions were present only in low concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1991.tb02154.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Dissolved organic matter in Arctic multi-year sea ice during winter: major components and relationship to ice characteristics (1995)
    Springer
    Polar biology 15 (1995), S. 477-483 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ice cores were collected between 10.03.93 and 15.03.93 along a 200 m profile on a large ice floe in Fram Strait. The ice was typical of Arctic multi-year ice, having a mean thickness along the profile of 2.56 ±0.53 m. It consisted mostly of columnar ice (83%) grown through congelation of seawater at the ice bottom, and the salinity profiles were characterized by a linear increase from 0 psu at the top to values ranging between 3 and 5 psu at depth. Distributions of dissolved organic carbon (DOC) and nitrogen (DON) and major nutrients were compared with ice texture, salinity and chlorophyll a. DOC, DON, dissolved inorganic nitrogen (DIN), NH4 + and NO2 − were present in concentrations in excess of that predicted by dilution curves derived from Arctic surface water values. Only NO3 − was depleted, although not exhausted. High DOC and DON values in conjunction with high NH4 + levels indicated that a significant proportion of the dissolved organic matter (DOM) was a result of decomposition/grazing of ice algae and/or detritus. The combination of high NH4 + and NO2 − points to regeneration of nitrogen compounds. There was no significant correlation between DOC and Chl a in contrast to DON, which had a positively significant correlation with both salinity and Chl a, and the distribution of DOM in the cores might best be described as a combination of both physical and biological processes. There was no correlation between DOC and DON suggesting an uncoupling of DOC and DON dynamics in multi year ice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00237461
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Allocation of photoassimilated carbon into major algal metabolite fractions: Variation between two diatom species isolated from the Weddell Sea (Antarctica) (1993)
    Springer
    Polar biology 13 (1993), S. 281-286 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Distribution of photoassimilated carbon into major metabolite classes differed between two Antarctic diatom species, Nitzschia curta and a small unicellular Chaetoceros sp.. Time course uptake studies (over 54 h) revealed that 14C allocation appeared to be equilibrated after approximately 8 h at light saturated photosynthesis. During short term dark periods (6 h), polysaccharides as well as low-molecular-weight compounds were catabolised to sustain protein synthesis in the dark, whilst lipid reserves were not mobilised for this process. Experiments with these two species were conducted at 0 and -1.5°C, although no difference in the distribution of radiolabel was measured between the two temperatures. It is hypothesised that under near-optimal conditions fast growing species are characterised by a high carbon turnover associated with a rapid flow of newly assimilated carbon into polymeric compound classes. On the other hand, slower growing species (such as N. curta) may store a significant amount of surplus carbon in the low-molecular-weight metabolite fraction. Species specific preferences were observed when comparing the accumulation of radiolabel into the lipid pools.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238764
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  • 5
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    Physical oceanography at Drescher Inlet during POLARSTERN cruise ANT-XV/3 (2009)
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Details
    Publication Date: 2023-04-21
    Keywords: ANT-XV/3, PS48; Calculated; Conductivity; CTD, SEA-BIRD SBE 19; CTD/Rosette; CTD-RO; Density, sigma-theta (0); DEPTH, water; DRE1998; DRE1998_305d; DRE1998_306d; DRE1998_307d; DRE1998_309d; DRE1998_401d; DRE1998_500d; DRE1998_503d; DRE1998_600d; DRE1998_707d; DRE1998_708d; Drescher Camp; Event label; Marine Mammal Tracking; MMT; Pressure, water; Salinity; Southern Ocean - Atlantic Sector; Temperature, water; Temperature, water, potential
    Type: Dataset
    Format: text/tab-separated-values, 31674 data points
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  • 6
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    Water column nutrient and dissolved organic carbon concentrations, dissolved organic matter characteristics and bacterial abundance in three Baltic Sea estuaries (2018)
    PANGAEA
    In:  Supplement to: Asmala, Eero; Kaartokallio, Hermanni; Carstensen, Jacob; Thomas, David N (2016): Variation in riverine inputs affect dissolved organic matter characteristics throughout the estuarine gradient. Frontiers in Marine Science, 2, 125, https://doi.org/10.3389/fmars.2015.00125
    Details
    Publication Date: 2023-02-15
    Description: Terrestrial dissolved organic matter (DOM) undergoes significant changes during the estuarine transport from river mouths to the open sea. These include transformations and degradation by biological and chemical processes, but also the production of fresh organic matter. Since many of these processes occur simultaneously, properties of the DOM pool represent the net changes during the passage along the hydrological path. We examined changes in multiple DOM characteristics across three Finnish estuarine gradients during spring, summer and autumn: Dissolved organic carbon (DOC) concentration, coloured DOM absorbance and fluorescence, stable carbon isotope signal of DOC and molecular size distribution. Changes in these DOM characteristics with salinity were analysed in relation to residence time (i.e. freshwater transit time), since increased residence time is likely to enhance DOM degradation while stimulating autochthonous DOM production at the same time. Our results show that the investigated DOM characteristics are highly correlated, indicating common physico-chemical transformations along the salinity continuum. Residence time did not explain variations in the DOM characteristics any better than salinity. Due to large variations in DOM characteristics at the river end-member, conservative mixing models do not seem to be able to accurately describe the occurrence and extent of deviations in DOM properties in the estuaries we investigated.
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 7
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    Water column nutrient and dissolved organic carbon concentrations, dissolved organic matter characteristics and bacterial abundance in Kyronjoki estuary (2018)
    PANGAEA
    Details
    Publication Date: 2023-02-15
    Keywords: Absorption coefficient, 230 nm; Absorption coefficient, 254 nm; Absorption coefficient, 275 nm; Absorption coefficient, 295 nm; Absorption coefficient, 300 nm; Absorption coefficient, 350 nm; Absorption coefficient, 355 nm; Absorption coefficient, 375 nm; Absorption coefficient, 400 nm; Absorption coefficient, 440 nm; Aluminium, dissolved; Ammonium; Automated analysis following alkaline persulfate oxidation; Bacteria; Carbon, organic, dissolved; DATE/TIME; Depth, description; Depth of Secchi Disk; Event label; Fluorescence, peak A; Fluorescence, peak C; Fluorescence, peak M; Fluorescence, peak T; Fluorescence index; High nucleic acid bacteria; ICP-OES; Iron, dissolved; Kyronjoki_00; Kyronjoki_01; Kyronjoki_02; Kyronjoki_03; Kyronjoki_04; Kyronjoki_XX; Lachat QuickChem 8000 flow injection autoanalyzer; LATITUDE; Leucine incorporation rate; LONGITUDE; Low nucleic acid bacteria; Manganese, dissolved; Manually after Grasshoff et al. (1983); Molecular mass; MULT; Multiple investigations; Nitrate; Nitrite; Nitrogen, inorganic, dissolved; Nitrogen, organic, dissolved; Nitrogen, total; Nitrogen, total dissolved; PDZ Europa ANCA-GSL elemental analyser; Ratio; Salinity; Sample ID; SEC analyser; Silicate; Specific ultraviolet absorbance normalized to DOC; Spectral slope, 275-295 nm; Spectral slope, 300-650 nm; Spectral slope, 350-400 nm; Spectrophotometer UV/VIS (PerkinElmer Lambda 650); Subtracting combined inorganic nitrogen from total dissolved nitrogen; Temperature, water; Thymidine incorporation rate; TOC analyser, MQ1000; Varian Cary Eclipse fluorometer (Agilent); δ13C, dissolved inorganic carbon; δ15N, total dissolved nitrogen
    Type: Dataset
    Format: text/tab-separated-values, 2185 data points
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  • 8
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    (Table 1) Air and ice temperatures during sea- and land fast-ice sampling of the SIPEX and DDU campaigns in 2007
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Antarctica; Aurora Australis; Campaign; DATE/TIME; DDU2007; DDU2007_StC; Dumont d´Urville Station; Event label; ICE; Ice station; IO-1; IO-10; IO-11; IO-12; IO-13; IO-14; IO-2; IO-3; IO-4; IO-5; IO-6; IO-7; IO-8; IO-9; Latitude of event; Longitude of event; Sample ID; Sample thickness; Sample type; SIPEX; SNOW; Snow/ice sample; South Indian Ocean; Temperature, air; Temperature, ice/snow
    Type: Dataset
    Format: text/tab-separated-values, 181 data points
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  • 9
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    (Table 2) Physico-chemical properties of brine collected from sackholes from land fast ice and from sea ice in East Antarctica during the SIPEX and DDU campaigns in 2007
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Alkalinity, total; Ammonium; Antarctica; Aurora Australis; Carbon, organic, dissolved; DATE/TIME; DDU2007; DDU2007_StC; Dumont d´Urville Station; Event label; ICE; Ice station; Ikaite; IO-1; IO-10; IO-11; IO-13; IO-14; IO-2; IO-3; IO-5; IO-6; IO-7; IO-8; IO-9; Latitude of event 2; Longitude of event; Nitrate and Nitrite; Nitrite; Nitrogen, organic, dissolved; Normalized to salinity S = 35; Phosphate; Salinity, brine; Sample ID; Silicon; SIPEX; SNOW; Snow/ice sample; South Indian Ocean; Temperature, brine
    Type: Dataset
    Format: text/tab-separated-values, 184 data points
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  • 10
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    (Supplement Table 1) Ikaite content in ice cores from land fast and sea ice in East Antarctica during the SIPEX and DDU campaigns in 2007
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Antarctica; Aurora Australis; Campaign; DATE/TIME; DDU2007; DDU2007_StC; Depth, bottom/max; DEPTH, ice/snow; Depth, top/min; Dumont d´Urville Station; Event label; ICE; Ice station; Ikaite; IO-1; IO-10; IO-11; IO-12; IO-13; IO-14; IO-2; IO-3; IO-4; IO-5; IO-6; IO-7; IO-8; IO-9; Latitude of event; Longitude of event; Sample ID; Sample type; SIPEX; SNOW; Snow/ice sample; South Indian Ocean
    Type: Dataset
    Format: text/tab-separated-values, 864 data points
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