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  • Articles  (84)
  • 2020-2023  (1)
  • 2015-2019  (5)
  • 2005-2009  (64)
  • 1995-1999  (14)
  • 1
    Electronic Resource
    Electronic Resource
    Reply to the Editor (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiovascular electrophysiology 9 (1998), S. 0 
    Details
    ISSN: 1540-8167
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-8167.1998.tb00921.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Emergency Placement of Platinum Coils to Prevent Cardiac Tamponade After Wire Perforation of an Occluded Venous Coronary Bypass Graft (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of interventional cardiology 10 (1997), S. 0 
    Details
    ISSN: 1540-8183
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A case is reported of a patient with impending cardiac tamponade due to vessel perforation following balloon angioplasty of an occluded venous bypass graft. Prolonged balloon inflation failed to seal the perforation. Leakage was controlled immediately by the delivery of two platinum coils into the perforation. In case of a vessel perforation during an attempt to recanalize an occluded coronary artery bypass, placement of intracoronary platinum coils to seal the perforation may prevent the development of cardiac tamponade.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-8183.1997.tb00058.x
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  • 3
    Electronic Resource
    Electronic Resource
    Clinical Recurrences After Successful Accessory Pathway Ablation: (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiovascular electrophysiology 8 (1997), S. 0 
    Details
    ISSN: 1540-8167
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Dormant Accessory Pathways. Introduction: Recurrence of clinical symptoms after radiofrequency catheter ablation of an accessory atrioventricular pathway (AP) may be due to the late manifestation of an additional AP that was not detected during the initial ablation session. It was the purpose of this study to elucidate the phenomenon of these “dormant” APs. Methods and Results: Of 1280 consecutive patients who underwent radiofrequency catheter ablation of an AP, 54 patients (4.2 %) developed clinical symptoms postablation, necessitating a repeat ablation session. Recurrence of conduction over the AP targeted al the initial ablation session was found in 45 patients, whereas in the other 9 patients (0.7%) the manifestation of a previously unnoticed AP had caused symptom recurrence. Retrospective analysis of the data from these patients’ ablation sessions revealed that the late manifesting AP was ablated at a site clearly different from that of the initially targeted AP, and that the manifestation of conduction over a previously “dormant” AP occurred significantly later than the recovery of a presumably ablated AP. Seven (78%) of the 9 “dormant” APs were concealed, and none exhibited decremental conduction properties. Conclusion: The incidence of clinical recurrences mediated by the late manifestation of conduction over a previously “dormant” AP is low. The lack of an anatomic vicinity of these predominantly concealed APs with the initially targeted AP and the lack of evidence for their presence during the initial ablation session suggest intermittent conduction as the most likely explanation for their late manifestation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-8167.1997.tb01033.x
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  • 4
    Electronic Resource
    Electronic Resource
    Mapping of the Coronary Sinus and Great Cardiac Vein Using a 2-French Electrode Catheter and a Right Femoral Approach (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiovascular electrophysiology 8 (1997), S. 0 
    Details
    ISSN: 1540-8167
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Coronary Sinus Mapping. Introduction: Local electrogranis recorded from the coronary sinus and great cardiac vein provide important information for the diagnosis of various arrhythmias and identification of target sites for ablation of left-sided accessory pathways. One limitation of present techniques is the inability, in many cases, to probe the great cardiac vein at the anterior mitral annulus. We tested the feasibility of a new technique for catheterization of the coronary sinus and great cardiac vein by means of a small-diameter electrode catheter advanced via a right femoral approach through an angiography catheter. Methods and Results: Of 22 patients (12 men and 10 women; ages 44.5 ± 13.4 years) undergoing radiofrequency ablation of a supraventricular tachycardia, cannulation of the coronary sinus orifice using a 6-French 1L or 2L Amplatz catheter was achieved in 20 patients (91%) within 0.9 ± 0.6 minutes; after cannulation, a 2-French octapolar electrode catheter with a soft radiopaque tip and a 3-mm interelectrode distance could he advanced in all 20 patients through the guiding catheter to the great cardiac vein in the anterior region of the AV sulcus within 0.8 ± 0.7 minutes. Atrial and ventricular local potentials were recorded all along the mitral annulus during sinus rhythm, atrial and ventricular pacing, or supraventricular tachycardia. Variation of local potential amplitude never exceeded 20% of the mean and presented similar stability at all annular regions. The arrhythmogenic substrate was identified in all patients. Of 18 patients with 21 left-sided accessory pathways, an accessory pathway potential could he recorded at the ablation site by one or more adjacent epicardial electrode pairs in 10 pathways. No procedure-related complications were observed. Conclusions: The technique introduced in this study proved feasible in 91% of patients. Its main advantages are the simplicity and rapidity of coronary sinus cannulation and the ability to advance the electrode catheter to the anterior cardiac vein. In addition, closely spaced bipolar electrograms resulted in enhanced atrial, ventricular, and accessory pathway potential resolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-8167.1997.tb00802.x
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  • 5
    Electronic Resource
    Electronic Resource
    Novel microbial communities of the Haakon Mosby mud volcano and their role as a methane sink (2006)
    [s.l.] : Nature Publishing Group
    Nature 443 (2006), S. 854-858 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Mud volcanism is an important natural source of the greenhouse gas methane to the hydrosphere and atmosphere. Recent investigations show that the number of active submarine mud volcanoes might be much higher than anticipated (for example, see refs 3–5), and that gas emitted ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature05227
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  • 6
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    The Coastal Observing System for Northern and Arctic Seas (COSYNA) (2017)
    COPERNICUS GESELLSCHAFT MBH
    In:  EPIC3Ocean Science, COPERNICUS GESELLSCHAFT MBH, 13, pp. 379-410, ISSN: 1812-0784
    Details
    Publication Date: 2019-05-17
    Description: The Coastal Observing System for Northern and Arctic Seas (COSYNA) was established in order to better understand the complex interdisciplinary processes of northern seas and the arctic coasts in a changing environment. Particular focus is given to the German Bight in the North Sea as a prime example for a heavily used coastal area, and Svalbard as an example of an arctic coast that is under strong pressure due to global change. The automated observing and modelling system COSYNA is designed to monitor real time conditions, provide short-term forecasts and data products, and to assess the impact of anthropogenically induced change. Observations are carried out combining satellite and radar remote sensing with various in situ platforms. Novel sensors, instruments, and algorithms are developed to further improve the understanding of the interdisciplinary interactions between physics, biogeochemistry, and the ecology of coastal seas. New modelling and data assimilation techniques are used to integrate observations and models in a quasi-operational system providing descriptions and forecasts of key hydrographic variables. Data and data products are publically available free of charge and in real time. They are used by multiple interest groups in science, agencies, politics, industry, and the public.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 7
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    In Situ Mass Spectrometry in Marine Science; Distribution and Quantification of Submarine Methane Sources (2016)
    In:  EPIC3GRC-Conference: Natural Gas Hydrate Systems, Hotel Galvez in Galveston TX United States, 2016-02-28-2016-03-04Poster Session
    Details
    Publication Date: 2016-06-14
    Description: We present the in situ use of an underwater mass spectrometer (UWMS) for the detection and quantification of active submarine methane seeps. The key benefit of using this novel technique is the rapid instrumental response, which allows an up to 750 times higher sampling frequency of dissolved gas concentrations compared to other methods. Among other major and trace gases, the increased data density and accuracy allows for the improved determination of methane point-sources. Methane is the most abundant organic compound in the atmosphere and its influence on global climate is the subject of current scientific discussion. One source of atmospheric methane with variable strength is the ocean’s seafloor e.g. through the destabilization of gas hydrates. These submarine methane sources are characterized by rising gas bubbles and/or the diffusive flux of gas into the water column. While ex situ sampling methods are limited by the time and costs, the primary limitation is the difficulty in capturing concentrations that are highly dynamic in time and space. Using an optimized UWMS (significantly improved in detection limit by a cryo-trap system) in the North Sea (Atlantic Ocean), we have obtained high-resolution 3D distribution patterns of dissolved methane in the water column. In addition to presenting novel methodologies using in situ mass spectrometry to detect, map and calculate the methane inventory above submarine sources, we will present a new configuration of instruments to determine the diffusive transportation rates at the sediment-water-transition-zone.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
    Format: application/pdf
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  • 8
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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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  • 9
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    Cryo-pelagic coupling in the marginal ice-zone of the central Barents Sea during early spring (1998)
    In:  EPIC3Ber. Polarforsch., 296, pp. 40-42
    Details
    Publication Date: 2014-09-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Inbook , peerRev
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  • 10
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    Application of GIS for calculations of geochemical budgets in the marine environment (1998)
    In:  EPIC3Eos, Transactions, AGU supplement, 79(45), 511 p.
    Details
    Publication Date: 2019-07-17
    Description: A major attempt of geochemical studies is the investigation of the transfer of primary produced biogenic components (e. g. organic carbon or biogenic silica) from surface waters to the deep-sea and their burial in sediments. Particle trap data and investigations of sediments and pore waters provide a suitable data set for the evaluation of such budgets. Nevertheless, these local measurements allow no direct calculation of global or basin-wide geochemical budgets. Major difficulties are the calculation of regions with irregular shape like ocean basins or continental slopes and the spatial extrapolation of flux measurements.Geographic Information Systems (GIS) combine several techniques to solve such problems. GIS allows the exact planimetry of spatial entities and the combination of different information layers like bathymetry, remote sensing data or field measurements by overlay technique. Furthermore GIS enables different geographic projections to controll an appropriate equal area calculation. Gridded ocean-wide data sets permit a cell-by-cell processing, which guarantees no loss of information. By logical queries to a GIS data base, spatial data sets are easily devided into zones of special interests.As an example for the application of GIS the geochemical budget of the organic carbon and biogenic silica fluxes through the sediment-water interface of the northern North Atlantic will be presented. By establishing an empirical relationship based on measured benthic fluxes, water depth and satellite derived primary production rates an area-wide organic carbon flux extrapolation is achieved. Using estimated sediment accumulation rates burial rates are calculated. A similar aproach is used to model biogenic silica flux. Statistical and visual analysis are performed via GIS to controll the extrapolation of data.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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