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  • 1
    Online Resource
    Online Resource
    Mathematical models of early diagenetic processes : impacts on the biogeochemical environment of the deep-sea floor (1999)
    Kiel
    Details Availability
    Keywords: Tiefseeboden ; Dissertation ; Diagenese ; Tiefseesediment ; Peru-Becken ; Hochschulschrift
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource ( 160Seiten = 14MB) , graph. Darst., Kt
    URL: https://oceanrep.geomar.de/id/eprint/49626/
    Language: English
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  • 2
    Online Resource
    Online Resource
    Untersuchungen zum regionalen Verteilungsmuster benthischer Stoffflüsse unter Berücksichtigung biogeographischer Provinzen im Arabischen Meer und im Atlantik (2000)
    Kiel
    Details Availability
    Keywords: Dissertation ; Hochschulschrift ; Atlantischer Ozean Nordost ; Abyssal ; Benthos ; Meeressediment ; Frühdiagenese ; Arabisches Meer
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource ( 202Seiten = 25MB) , graph. Darst
    URL: https://oceanrep.geomar.de/id/eprint/48016/
    Language: German
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  • 3
    Electronic Resource
    Electronic Resource
    Elektronenspektrometrische Untersuchungen zur Natur des 2,48 eV-Energieverlustes von Gold (1971)
    Springer
    The European physical journal 247 (1971), S. 263-266 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Experimental evidence of the existence of a surface plasma oscillation in the region of the onset of interband transitions near 2.5 eV in gold is given by electron energy loss measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01402496
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Die optischen Eigenschaften von Gold, Silber und Gold-Silber-Legierungen zwischen 2 und 40eV aus Energieverlustmessungen (1972)
    Springer
    The European physical journal 250 (1972), S. 87-98 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The energy loss functions Im $$\left( { - \frac{1}{\varepsilon }} \right)$$ of Au, Ag and Ag-Au alloys are determined from energy loss spectra of fast electrons, using different methods in the energy regions 2 to 4 eV and 4 to 40 eV. The optical constants ɛ1 und ɛ2 are calculated from the energy loss functions by Kramers-Kronig analysis. The experimental results show a different dependence in the optical behaviour of the alloy on the alloying component: if Au is added to Ag, the effect on the optical properties is stronger than in the reverse case. Between 50 and 70 at.% Au in the alloy the specific properties of Ag and Au vanish completely. An interpretation of the energy loss maxima as surface plasma oscillation, volume plasma oscillation and interband transition is attempted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01386895
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Lack of correlation after reperfusion between ventricular function and infarct size estimated by thallium single-photon emission computed tomography (1988)
    Springer
    The international journal of cardiovascular imaging 3 (1988), S. 203-208 
    Details
    ISSN: 1573-0743
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In 32 patients with acute myocardial infarction, who had undergone successful intracoronary thrombolysis, the results of regional wall motion measured from contrast cineangiograms 10 to 21 days after thrombolysis were related to the results of thallium single-photon emission computed tomography (SPECT) after intravenous dipyridamole. Wall motion was measured by means of the centerline method, and thallium defect size was estimated by comparing the patient's circumferential profile with that of 20 normals. No correlation was found between ejection fraction or regional wall motion and thallium defect size. The time from symptom onset to thrombolysis was inversely correlated with the degree of hypokinesis (r=−0.51) but not with thallium defect size. In patients treated within 3 hours, hypokinesis was significantly less than in patients treated later (−1.1±0.6 SD vs −2.2±0.8 SD, p〈0.01) whereas thallium defect size was not significantly different in both groups. It is concluded that, in patients after thrombolysis, thallium defect size determined by SPECT does not reflect the degree of left ventricular dysfunction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01797718
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Diprafenone for treatment of Wolff-Parkinson-White syndrome (1989)
    Springer
    Cardiovascular drugs and therapy 3 (1989), S. 73-79 
    Details
    ISSN: 1573-7241
    Keywords: Wolff-Parkinson-White syndrome ; diprafenone ; antiarrhythmic drugs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effect of intravenous (1.5 to 2.0 mg/kg body weight) and oral (300 to 375 mg/d) diprafenone was studied in 15 patients with the Wolff-Parkinson-White syndrome and symptomatic supraventricular tachycardia. Intravenous application of diprafenone significantly increased atrioventricular nodal conduction time as well as the effective refractory periods of the right ventricle and the accessory pathway in both the antegrade and retrograde directions. Antegrade conduction block in the accessory pathway occurred in two patients after the dose was increased to 2.0 mg/kg body weight. Intravenous diprafenone suppressed the inducibility of supraventricular tachycardia in two patients, but the tachycardia cycle length was significantly increased in all other patients. Fourteen patients were treated with oral diprafenone, and 11 were asymptomatic during a 17-month follow-up, two of these after the dose had been increased to 375 mg/d. Oral therapy had to be withdrawn in two patients because of adverse gastrointestinal side effects and in one because of recurring bronchospasm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01881531
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    Paper (German National Licenses)
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  • 7
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    A method for the calculation of anaerobic oxidation of methane rates across regional scales: an example from the Belt Seas and The Sound (North Sea–Baltic Sea transition) (2013)
    Springer
    In:  Geo-Marine Letters, 33 (4). pp. 299-310.
    Details
    Publication Date: 2017-05-19
    Description: Estimating the amount of methane in the seafloor globally as well as the flux of methane from sediments toward the ocean–atmosphere system are important considerations in both geological and climate sciences. Nevertheless, global estimates of methane inventories and rates of methane production and consumption through anaerobic oxidation in marine sediments are very poorly constrained. Tools for regionally assessing methane formation and consumption rates would greatly increase our understanding of the spatial heterogeneity of the methane cycle as well as help constrain the global methane budget. In this article, an algorithm for calculating methane consumption rates in the inner shelf is applied to the gas-rich sediments of the Belt Seas and The Sound (North Sea–Baltic Sea transition). It is based on the depth of free gas determined by hydroacoustic techniques and the local methane solubility concentration. Due to the continuous nature of shipboard hydroacoustic measurements, this algorithm captures spatial heterogeneities in methane fluxes better than geochemical analyses of point sources such as observational/sampling stations. The sensibility of the algorithm with respect to the resolution of the free gas depth measurements (2 m vs. 50 cm) is proven of minor importance (a discrepancy of 〈10%) for a small part of the study area. The algorithm-derived anaerobic methane oxidation rates compare well with previous measured and modeling studies. Finally, regional results reveal that contemporary anaerobic methane oxidation in worldwide inner-shelf sediments may be an order of magnitude lower (ca. 0.24 Tmol year–1) than previous estimates (4.6 Tmol year–1). These algorithms ultimately help improve regional estimates of anaerobic oxidation of methane rates.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    DOI: 10.1007/s00367-013-0329-z
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 8
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    Radon (222Rn) as tracer for submarine groundwater discharge investigation — limitations of the approach at shallow wind-exposed coastal settings (2022)
    Springer
    Details
    Publication Date: 2024-02-07
    Description: Mapping radon (222 Rn) distribution patterns in the coastal sea is a widely applied method for localizing and quantifying submarine groundwater discharge (SGD). While the literature reports a wide range of successful case studies, methodical problems that might occur in shallow wind-exposed coastal settings are generally neglected. This paper evaluates causes and effects that resulted in a failure of the radon approach at a distinct shallow wind-exposed location in the Baltic Sea. Based on a simple radon mass balance model, we discuss the effect of both wind speed and wind direction as causal for this failure. We show that at coastal settings, which are dominated by gentle submarine slopes and shallow waters, both parameters have severe impact on coastal radon distribution patterns, thus impeding their use for SGD investigation. In such cases, the radon approach needs necessarily to allow for the impact of wind speed and wind direction not only during but also prior to the field campaign.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 9
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    Seasonal and spatial variations of benthic oxygen and nitrogen fluxes in the Helgoland Mud Area (southern North Sea) (2015)
    PERGAMON-ELSEVIER SCIENCE LTD
    In:  EPIC3Continental Shelf Research, PERGAMON-ELSEVIER SCIENCE LTD, 106, pp. 118-129, ISSN: 0278-4343
    Details
    Publication Date: 2015-10-26
    Description: Benthic oxygen and nitrogen fluxes were quantified within the years 2012 to 2014 at different time series sites in the southern North Sea with the benthic lander NuSObs (Nutrient and Suspension Observatory). In situ incubations of sediments, in situ bromide tracer studies, sampling of macrofauna and pore water investigations revealed considerable seasonal and spatial variations of oxygen and nitrogen fluxes. Seasonal and spatial variations of oxygen fluxes were observed between two different time series sites, covering different sediment types and/or different benthic macrofaunal communities. On a sediment type with a high content of fine grained particles (o63 mm) oxygen fluxes of �15.5 to �25.1 mmol m�2 d�1 (June 2012), �2.0 to �8.2 mmol m�2 d�1 (March 2013), �16.8 to �21.5 mmol m�2 d�1 (November 2013) and �6.1 mmol m�2 d�1 (March 2014) were measured. At the same site a highly diverse community of small species of benthic macrofauna was observed. On a sediment type with a low content of fine grained particles (o63 mm) high oxygen fluxes (�33.2mmol m�2 d�1 August 2012; �47.2 to �55.1 mmolm�2 d�1 November 2013; �16.6 mmol m�2 d�1 March 2014) were observed. On this sediment type a less diverse benthic macrofaunal community, which was dominated by the large bodied suspension feeder Ensis directus, was observed. Average annual rain rates of organic carbon and organic nitrogen to the seafloor of 7.44 mol Cm�2 y�1 and 1.34 mol N m�2 y�1 were estimated. On average 79% of the organic bound carbon and 95% of the organic bound nitrogen reaching the seafloor are recycled at the sediment–water interface. & 2015 Elsevier Ltd. All rights reserved
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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    PAPER (OA)
  • 10
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    A water column study of methane around gas flares located at the West Spitsbergen continental margin (2014)
    PERGAMON-ELSEVIER SCIENCE LTD
    In:  EPIC3Continental Shelf Research, PERGAMON-ELSEVIER SCIENCE LTD, 72, pp. 107- 118, ISSN: 0278-4343
    Details
    Publication Date: 2017-01-09
    Description: Abstract In the Arctic Seas, the West Spitsbergen continental margin represents a prominent methane seep area. In this area, free gas formation and gas ebullition as a consequence of hydrate dissociation due to global warming are currently under debate. Recent studies revealed shallow gas accumulation and ebullition of methane into the water column at more than 250 sites in an area of 665 km2. We conducted a detailed study of a subregion of this area, which covers an active gas ebullition area of 175 km2 characterized by 10 gas flares reaching from the seafloor at~245 m up to 50 m water depth to identify the fate of the released gas due to dissolution of methane from gas bubbles and subsequent mixing, transport and microbial oxidation. The oceanographic data indicated a salinity-controlled pycnocline situated ~20 m above the seafloor. A high resolution sampling program at the pycnocline at the active gas ebullition flare area revealed that the methane concentration gradient is strongly controlled by the pycnocline. While high methane concentrations of up to 524 nmol L−1 were measured below the pycnocline, low methane concentrations of less than 20 nmol L−1 were observed in the water column above. Variations in the δ 13 C CH 4 values point to a 13C depleted methane source (~−60‰ VPDB) being mainly mixed with a background values of the ambient water (~−37.5‰ VPDB). A gas bubble dissolution model indicates that ~80% of the methane released from gas bubbles into the ambient water takes place below the pycnocline. This dissolved methane will be laterally transported with the current northwards and most likely microbially oxidized in between 50 and 100 days, since microbial CH4 oxidation rates of 0.78 nmol d−1 were measured. Above the pycnocline, methane concentrations decrease to local background concentration of ~10 nmol L−1. Our results suggest that the methane dissolved from gas bubbles is efficiently trapped below the pycnocline and thus limits the methane concentration in surface water and the air–sea exchange during summer stratification. During winter the lateral stratification breaks down and fractions of the bottom water enriched in methane may be vertically mixed and thus be potentially an additional source for atmospheric methane.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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