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  • 1
    Electronic Resource
    Electronic Resource
    Uptake of L-valine and other amino acids by the polychaete Nereis virens (1979)
    Springer
    Marine biology 52 (1979), S. 45-52 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract For valine uptake by the polychaete Nereis virens Sars, the kinetic constants were: V max=355 nmol g-1 fresh weight h-1, K m=20 μM. Leucine and some other amino acids acted as partial inhibitors of valine uptake. Valine uptake rate was 78% higher at 21.5‰ S than at 14‰ S. The major portion of valine absorbed by the polychaete could be extracted as free valine, with 6.5 to 15.6% being respired, and 3.6 to 9.5% incorporated into proteins. Calculations indicate that 7 to 12% of the metabolism of N. virens may be sustained by uptake of glycine and aspartic acid from natural concentrations. It is suggested that uptake of amino acids by this worm is important in the nitrogen cycling of marine sediments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00386856
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Strontium-Isotope Studies Of Chloride-Contaminated Groundwater, Denmark (1995)
    Springer
    Hydrogeology journal 3 (1995), S. 52-57 
    Details
    ISSN: 1435-0157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: RÉSUMÉ: La salinité des aux souterraines du Danemark possède trois origines principales: 1) l'intrusion d'eau de mer dans les aquifères littoraux, 2) les eaux connées des sédiments marins constituant l'aquifère, 3) la remontée dans les aquifères superficiels de saumures provenant d'eaux connées de sédiments et de formations évaporitiques profonds. L'étude des isotopes du strontium d'eaux souterraines chargées en chlorures d'un aquifère sableux du Quaternaire du champ captant de Stautrup (Danemark) montre que le chimisme des eaux souterraines est fortement marqué par les eaux connées des argiles micacées marines sous-jacentes de l'Oligocène. Des critères hydrochimiques des isotopes du strontium ont par conséquent permis d'identifier les sources de la salinité d'eaux souterraines.
    Abstract: RESUMEN: La salinidad en las aguas subterráneas de Dinamarca tiene tres orígenes principales: 1) Infiltración de agua marina en acuíferos costeros, 2) agua de formación salina en acuíferos de origen sedimentario marino, y 3) intrusión de salmueras procedentes de aguas salinas de formaciones profundas y de depósitos evaporíticos subterráneos. Estudios isotópicos del estronico en las aguas subterráneas contaminadas or cloruros en un acuífero arenoso Cuaternario en Stautrup Waterworks, Dinamarca, indican que el agua está fuertement influenciada por el agua de formación salina correspondiente a una capa inferior de micas arcillosas oligocénicas. Por tanto, los criterios hidroquímicos isotópicos se pudieron utilizar satisfactoriamente para identificar las fuentes de salinidad de las aguas subterráneas.
    Notes: Abstract Saline groundwater has three principal origins in Denmark: 1) Seawater infiltration into nearcoastal aquifers, 2) saline formation water in aquifers of marine sedimentary origin, and 3) intrusion of brines from deep saline formation waters and evaporitic deposits in the subsurface. Strontium-isotope studies of chloride-contaminated groundwater from a Quaternary sandy aquifer at Stautrup Waterworks, Denmark, indicate that the groundwater is heavily influenced by saline formation water from underlying Oligocene marine mica clay. Thus, strontium isotopic hydrochemical criteria were successfully used to identify the sources of saline groundwater.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100400050066
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Evaluation Of Local Fracture Systems By Azimuthal Resistivity Surveys: Examples From South Norway (1994)
    Springer
    Hydrogeology journal 2 (1994), S. 19-25 
    Details
    ISSN: 1435-0157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Anisotropic permeability conditions in fractured rocks can be evaluated from surface azimuthal resistivity surveys. Resultant anisotropy figures (RAFs) are constructed from the surveys and are compared with constructed model RAFs. The field results indicate that the properties of multiple subsurface fracture sets can be determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100400050248
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    Paper (German National Licenses)
    Fulltext
  • 4
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    Unknown
    Occurrence and bacterial cycling of dissolved nitrogen in the Gulf of Riga, the Baltic Sea (1999)
    In:  EPIC3Marine ecology-progress series, 191, pp. 1-18
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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    PAPER (OA)
  • 5
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    Occurrence and bacterial cycling of dissolved nitrogen in the Gulf of Riga, the Baltic Sea (1999)
    In:  EPIC3Marine ecology-progress series, 191, pp. 1-18
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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    PAPER (OA)
  • 6
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    Unknown
    Occurrence and bacterial cycling of dissolved nitrogen in the Gulf of Riga, the Baltic Sea (1999)
    In:  EPIC3Marine ecology-progress series, 191, pp. 1-18
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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    PAPER (OA)
  • 7
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    'Bubbling reefs' in the Kattegat: submarine landscapes of carbonate-cemented rocks support a diverse ecosystem at methane seeps (1992)
    Inter Research
    In:  Marine Ecology Progress Series, 83 . pp. 102-112.
    Details
    Publication Date: 2018-03-16
    Description: Methane seeps in shallow waters in the northern Kattegat off the Danish coast form spectacular submarine landscapes - the 'bubbling reefs' - due to carbonate-cemented sandstone structures which are colonized by brightly coloured animals and plants. These structures may be 100 m2 in area and consist of pavements, complex formations of overlying slab-type layers, and pillars up to 4 m high. The carbonate cement (high-magnesium calcite, dolomite or aragonite) is 13C-depleted, indicating that it originated as a result of microbial methane oxidation. It is believed that the cementation occurred in the subsurface and that the rocks were exposed by subsequent erosion of the surrounding unconsolidated sediment. The formations are interspersed with gas vents that intermittently release gas, primarily methane, at up to 25 1 h-' The methane most likely originated from the microbial decomposition of plant material eposited during the Eemian and early Weichselian periods, i.e. l00 000 to 125 000 years B.P. Aerobic methane oxidation in the sediment was restricted Lo the upper 4 cm in muddy sand and to the upper 13 cm In coarse sand. Maximum aerobic methane oxidation rates ranged from 4.8 to 45.6 pm01 dm-3 d". The rock surfaces and epifauna around the seeps were also sites of methane-oxidizing activity. Integrated sulphate reduction rates for the upper 10 cm of muddy sand gave 4.2 to 26.6 mm01 m-2 d-' These rates are higher than those previously reported from similar water depths in the Kattegat but did not relate to the sediment methane content. Since gas venting occurs over several km2 of the sea floor in the Kattegat it is likely to make a significant local contribution to the cycling of elements in the sediment and the water column. The rocks support a diverse ecosystem ranging from bacteria to macroalgae and anthozoans. Many animals live within the rocks in holes bored by sponges, polychaetes and bivalves. Stable carbon isotope composition (6'") of tissues of invertebrates from the rocks were in the range -17 to -24 'A, indicating that methane-derived carbon makes little direct contribution to their nutrition. Within the sediments surrounding the seeps there is a poor metazoan fauna, in terms of abundance, diversity and biomass. This may be a result of toxicity due to hydrogen sulphide input from the gas.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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