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  • 1
    Electronic Resource
    Electronic Resource
    Refraction Index and Dielectric Constant for Freon-13. (1962)
    s.l. : American Chemical Society
    Journal of chemical & engineering data 7 (1962), S. 317-319 
    Details
    ISSN: 1520-5134
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/je60013a045
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Fractionation of Nuclear Weapon Debris (1960)
    [s.l.] : Nature Publishing Group
    Nature 187 (1960), S. 1100-1101 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The purpose of this communication is to present a somewhat similar finding from an earlier study. At the time of one of the nuclear detonations at the Pacific Proving Grounds, gummed paper fall-out collectors were placed on platforms at various locations in the vicinity of the Eniwetok atoll. A few ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1871100a0
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    Paper (German National Licenses)
    Fulltext
  • 3
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    Phosphorus cycling in the North and South Atlantic Ocean subtropical gyres (2008)
    Nature Publishing Group
    In:  Nature Geoscience, 1 (7). pp. 439-443.
    Details
    Publication Date: 2017-02-23
    Description: Despite similar physical properties, the Northern and Southern Atlantic subtropical gyres have different biogeochemical regimes. The Northern subtropical gyre, which is subject to iron deposition from Saharan dust1, is depleted in the nutrient phosphate, possibly as a result of iron-enhanced nitrogen fixation2. Although phosphate depleted, rates of carbon fixation in the euphotic zone of the North Atlantic subtropical gyre are comparable to those of the South Atlantic subtropical gyre3, which is not phosphate limited. Here we use the activity of the phosphorus-specific enzyme alkaline phosphatase to show potentially enhanced utilization of dissolved organic phosphorus occurring over much of the North Atlantic subtropical gyre. We find that during the boreal spring up to 30% of primary production in the North Atlantic gyre is supported by dissolved organic phosphorus. Our diagnostics and composite map of the surface distribution of dissolved organic phosphorus in the subtropical Atlantic Ocean reveal shorter residence times in the North Atlantic gyre than the South Atlantic gyre. We interpret the asymmetry of dissolved organic phosphorus cycling in the two gyres as a consequence of enhanced nitrogen fixation in the North Atlantic Ocean4, which forces the system towards phosphorus limitation. We suggest that dissolved organic phosphorus utilization may contribute to primary production in other phosphorus-limited ocean settings as well.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1038/ngeo232
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    How widespread and important is N2 fixation in the North Atlantic Ocean? (2007)
    AGU (American Geophysical Union)
    In:  Global Biogeochemical Cycles, 21 . GB4015.
    Details
    Publication Date: 2018-03-21
    Description: The spatial extent of N2 fixation in the Atlantic Ocean is examined by determining the isotopic composition of N in suspended particulate organic nitrogen (δ15N PONsusp). The samples were collected from zonal and meridional transects of the Atlantic Ocean during a 3‐year period. There is a consistent depleted δ15N PONsusp signal extending over the center of the northern subtropical gyre, which partly coincides with a region where the tracer N* increases westward following the gyre circulation. This nonconservative behavior of N* implies that N2 fixation is responsible for the depleted δ15N PONsusp. A mixing model suggests that N2 fixation over parts of the northern gyre provides up to 74% of the N utilized by phytoplankton. However, since the PONsusp represents only a small fraction of the total N pool, N2 fixation probably only plays a minor role in supplying new N to the euphotic zone in the surface waters of the northern subtropical gyre.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2006GB002886
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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