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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
    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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  • 4
    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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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Radiofrequency Current Catheter Ablation for Control of Supraventricular Arrhythmias (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiovascular electrophysiology 4 (1993), S. 0 
    Details
    ISSN: 1540-8167
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Radiofrequency Catheter Ablation in SVT. With the advent of radiofrequency energy, catheter ablation techniques have become an accepted form of treatment for a variety of Supraventricular arrhythmias. The ablation of the atrioventricular (AV) node was performed first and is now widely used in patients with refractory atrial fibrillation or flutter. Ablation has also replaced surgery in patients with preexcitation syndromes, and as the complication rate in experienced centers is low, it has become the first line of treatment in these institutions. The results of catheter ablation in AV nodal reentrant tachycardia are excellent as well, although there is still debate about whether “slow” pathway ablation is superior to “fast” pathway ablation. Radiofrequency current ablation has also contributed to a better understanding of the pathophysiology of AV nodal reentrant tachycardia, as it has provided evidence for atrial participation in the reentrant circuit. Experience with atrial tachycardias and tachycardias due to Mahaim fibers remains limited. The ideal source of energy for specific arrhythmias is still unknown and improvement in catheter technology is needed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-8167.1993.tb01223.x
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  • 6
    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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  • 7
    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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  • 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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    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
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  • 10
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    Seasonal dynamics of the biogenic silica cycle in surface sediments of the Helgoland Mud Area (southern North Sea) (2015)
    PERGAMON-ELSEVIER SCIENCE LTD
    In:  EPIC3Continental Shelf Research, PERGAMON-ELSEVIER SCIENCE LTD, 107, pp. 103-114, ISSN: 0278-4343
    Details
    Publication Date: 2015-11-18
    Description: In coastal waters and the ocean silicic acid (Si(OH) 4 ) is a key nutrient for primary producers ( e.g . diatoms) and other siliceous organisms, because it is required for the formation of frustules and other hard parts made of biogenic silica (bSi). Especially in shallow waters like the southern North Sea, dissolution of bSi in surface sediments and the re fl ux of silicic acid from sediments into the water column is an important feedback mechanism for sustaining primary production. We investigated the temporal variability of benthic silicic acid fl uxes and the recycling ef fi ciency of bSi in surface sediments of the Helgoland Mud Area (southern North Sea). For this purpose we used different methods including a benthic chamber lander system for in situ fl ux studies of Si(OH) 4 , ex situ sediment incubations, pore water studies and sediment analysis. Our in situ measurements revealed considerable temporal variations with low silicic acid fl uxes in winter (0.3 – 1.0 mmol m � 2 d � 1 in March 2013 and 2014), increased fl uxes of 2.0 – 4.0 mmol m � 2 d � 1 in November 2013, and high fl uxes in June and August 2012 (3.6 – 8.3 mmol m � 2 d � 1 ). The relevance of biological mediated transport for the recycling of Si(OH) 4 was underlined by comparing in situ and ex situ sediment incubations, pore water studies, as well as depth pro fi les of benthic macrofauna. Mass budget calculations indicate that about 1.7 – 2.2 mol bSi m � 2 settle annually at the sea fl oor, off which about 60 – 81% are recycled within surface sediments and transported back into the water column
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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