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  • 2010-2014  (2)
  • 1995-1999  (1)
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  • 1
    Publication Date: 2024-02-01
    Keywords: Ammonium; Bacteria; Bacteria, biomass as carbon; Carbon, inorganic, dissolved; Carbon, organic, particulate; Carbon/nitrogen analyser (GF/F filtered); Carbon biomass estimation (unspec.); Chlorophyll a; Chlorophyll a, fluorometric determination (Grasshoff et al., 1983, Chemie GmbH); Conductivity; Continuous Flow Automated Analysis (Gordon et al., 1993, WOCE Tech Rpt 93-1); Coulometric titration (Knap et al., 1996, IOC Manuals and Guides 29, UNESCO); Counting by flow cytometer; CTD, Neil Brown, Mark III B, NB-4; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Elevation of event; Epifluorescence microscopy; Epifluorescence microscopy after acridine orange staining; Eukaryotes; Event label; Fluorescence, chlorophyll; JGOFS; JGOFS-IN-3; Joint Global Ocean Flux Study; Latitude of event; Leucine uptake rate; Longitude of event; Nanoflagellates, heterotrophic; Nitrate; Nitrite; Nitrogen, organic, particulate; Oxidation; then autoanalysis (GF/F filtered); Oxidation (alkaline) with borate buffered potassium persulphate; Oxygen; Oxygen, Winkler (Culberson, 1991, WOCE Report 68/91); Phosphate; Phosphorus, particulate; Pressure, water; Salinity; Seawater analysis after Grasshoff et al., 1983 (Verlag Chemie GmbH Weinheim); Silicate; Silicon, particulate; SO120; SO120_CTD02_002; SO120_CTD03_003; SO120_CTD04_004; SO120_CTD05_005; SO120_CTD06_006; SO120_CTD07_007; SO120_CTD08_008; SO120_CTD09_009; SO120_CTD10_010; SO120_CTD11_011; SO120_CTD12_012; SO120_CTD13_013; SO120_CTD14_014; SO120_CTD15_016; SO120_CTD15_017; SO120_CTD15_019; SO120_CTD16_023; SO120_CTD17_024; SO120_CTD18_027; SO120_CTD18_029; SO120_CTD19_030; SO120_CTD20_033; SO120_CTD20_034; SO120_CTD21_037; SO120_CTD21_038; SO120_CTD22_040; SO120_CTD23_042; SO120_CTD23_043; SO120_CTD24_046; SO120_CTD24_047; SO120_CTD25_050; SO120_CTD25_051; SO120_CTD25_053; SO120_CTD25_054; SO120_CTD28_055; SO120_CTD28_056; SO120_CTD28_057; SO120_CTD31_058; SO120_CTD31_059; SO120_CTD31_060; SO120_CTD34_062; SO120_CTD34_063; SO120_CTD38_066; SO120_CTD39_068; SO120_CTD39_069; SO120_CTD41_071; SO120_CTD41_072; SO120_CTD43_074; SO120_CTD43_075; Sonne; Temperature, water; Thymidine incorporation; Thymidine uptake rate; Tritiated leucine incorporation (Knap et al., 1996, IOC Manuals and Guides 29)
    Type: Dataset
    Format: text/tab-separated-values, 11513 data points
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  • 2
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    Inter Research
    In:  Aquatic Microbial Ecology, 19 . pp. 139-148.
    Publication Date: 2016-05-26
    Description: Phosphatase (P-ase) activity was determined together with other extracellular enzyme activities, bacterial abundance and production rates during the 2 SW Monsoon process studies of the German JGOFS Arabian Sea Program. Water samples were collected along the cruise tracks from the equator to the upwelling region at the shelf edge off Oman. Depth profiles of P-ase activity were strikingly different from those of the other enzymes. While values of aminopeptidase and β-glucosidase generally decreased below the euphotic zone, P-ase increased by factors of 1 to 7. The relation between peptidase- and P-ase activity was from 4 to 21 at the surface and from 3 to 5 at 800 m depth. Because P-ase production (dissolved and cell-bound) in deep waters is mainly dependent on bacteria, P-ase activities per bacterial cell were calculated: these were, on average, 37 times higher at 800 m than at the surface. We also observed a positive correlation of P-ase activity with phosphate concentrations in the depth profiles below the euphotic zone, while this relationship was much more variable in the mixed surface layer. These observations suggest that C-limited bacteria in the deep strata did not primarily focus on the phosphate generated by their P-ase activity but on the organic C compounds which were simultaneously produced and which could probably not be taken up prior to the hydrolytic detachment of phosphate. It is hypothesised that a considerable part of the measured P-ase activity was dissolved (though it might have originated from bacteria). These enzymes may be important for the slow, but steady regeneration of phosphate and organic C in mesopelagic waters.
    Type: Article , PeerReviewed
    Format: text
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  • 3
    Publication Date: 2017-01-31
    Repository Name: EPIC Alfred Wegener Institut
    Type: Miscellaneous , notRev
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