University of Bremen

About: University of Bremen is a education organization based out in Bremen, Germany. It is known for research contribution in the topics: Population & Context (language use). The organization has 14563 authors who have published 37279 publications receiving 970381 citations. The organization is also known as: Universität Bremen.

Impacts of hypoxia on the structure and processes in pelagic communities (zooplankton, macro-invertebrates and fish)

Abstract: . Dissolved oxygen (DO) concentration in the water column is an environmental parameter that is crucial for the successful development of many pelagic organisms. Hypoxia tolerance and threshold values are species- and stage-specific and can vary enormously. While some fish species may suffer from oxygen values of less than 3 mL O2 L−1 through impacted growth, development and behaviour, other organisms such as euphausiids may survive DO levels as low as 0.1 mL O2 L−1. A change in the average or the range of DO may have significant impacts on the survival of certain species and hence on the species composition in the ecosystem with consequent changes in trophic pathways and productivity. Evidence for the deleterious effects of oxygen depletion on pelagic species is scarce, particularly in terms of the effect of low oxygen on development, recruitment and patterns of migration and distribution. While planktonic organisms have to cope with variable DOs and exploit adaptive mechanisms, nektonic species may avoid areas of unfavourable DO and develop adapted migration strategies. Planktonic organisms may only be able to escape vertically, above or beneath the Oxygen Minimum Zone (OMZ). In shallow areas only the surface layer can serve as a refuge, but in deep waters many organisms have developed vertical migration strategies to use, pass through and cope with the OMZ. This paper elucidates the role of DO for different taxa in the pelagic realm and the consequences of low oxygen for foodweb structure and system productivity. We describe processes in two contrasting systems, the semi-enclosed Baltic Sea and the coastal upwelling system of the Benguela Current to demonstrate the consequences of increasing hypoxia on ecosystem functioning and services.

Ocean Margin Systems

Abstract: Introductory Paper.- Sedimentary Settings on Continental Margins - an Overview.- Continental Margins - Review of Geochemical Settings.- Imaging the Subsurface with 2-D and 3-D Seismic Data.- State of the Art and Future Prospect of Scientific Coring and Drilling of Marine Sediments.- New Technologies for Ocean Margin Studies - Autonomous Instrument Carrier Systems.- Autonomous Underwater Vehicles: Are they the Ideal Sensor Platforms for Ocean Margin Science?.- Margin Building - Regulating Processes.- Physical Processes and Modelling at Ocean Margins.- Seabed Classification at Ocean Margins.- The Benthic Boundary Layer.- Ocean Margin Early Diagenetic Processes and Models.- Slope Instability of Continental Margins.- Margin Building - Regulating Processes.- Fluid Flow and Subsurface Material Transport.- Fluid Flow in Continental Margin Sediments.- Macrobenthic Activity and its Effects on Biogeochemical Reactions and Fluxes.- Cold Seep Communities on Continental Margins: Structure and Quantitative Distribution Relative to Geological and Fluid Venting Patterns.- The Importance of Mineralization Processes in Surface Sediments of Continental Margins.- Numerical Modelling of Transport Processes in the Subsurface.- Subsurface Fluid Flow and Material Transport.- Benthic Population Dynamics and Relationship to Sedimentary Settings.- Benthic Biodiversity Across and Along the Continental Margin: Patterns, Ecological and Historical Determinants, and Anthropogenic Threats.- Molecular Ecology and Evolution of Slope Species.- Larval and Reproductive Strategies on European Continental Margins.- Factors Controlling Soft Bottom Macrofauna Along and Across European Continental Margins.- Reef-Forming Cold-Water Corals.- Life at the Edge: Achieving Prediction from Environmental Variability and Biological Variety.- Microbial Systems in Sedimentary Environments.- Processes driven by the Small Sized Organisms at the Water-Sediment Interface.- Nucleic Acid-Based Techniques for Analyzing the Diversity, Structure, and Function of Microbial Communities in Marine Waters and Sediments.- Carbonate Mounds as a Possible Example for Microbial Activity in Geological Processes.- S. Guidard and the ODP "Proposal 573" Team.- The Anaerobic Oxidation of Methane: New Insights in Microbial Ecology and Biogeochemistry.- Microbial Systems in Sedimentary Environments of Continental Margins.

Epidemiology and comorbidity of psoriasis in children

Abstract: Summary Background Psoriasis is a common disease affecting all age groups. In contrast to adult psoriasis, only few studies on the epidemiology of childhood psoriasis have been published. Objectives Assessment of prevalence and comorbidities of juvenile psoriasis in Germany based on health insurance data. Methods Data were collected from a database of about 1·3 million nonselected individuals from a German statutory health insurance organization which covers all geographical regions. Individuals with psoriasis were identified by ICD-10 codes applied to all outpatient and inpatient visits. The present analysis consists of all patients who were enlisted throughout the year 2005. The diagnosis of psoriasis was registered whenever there was at least one documented patient contact using code L40.* and subcodes. Comorbidities were also evaluated by ICD-10 diagnoses. Results In total, 33 981 patients with the diagnosis of psoriasis were identified. The prevalence in 2005 was 2·5%. The total rate of psoriasis in children younger than 18 years was 0·71%. The prevalence rates increased in an approximately linear manner from 0·12% at the age of 1 year to 1·2% at the age of 18 years. The overall rate of comorbidity in subjects with psoriasis aged under 20 years was twice as high as in subjects without psoriasis. Juvenile psoriasis was associated with increased rates of hyperlipidaemia, obesity, hypertension, diabetes mellitus, rheumatoid arthritis and Crohn disease. Conclusions Psoriasis is a common disease in children. Like in adults, it is associated with significant comorbidity. Increased attention should be paid to the early detection and treatment of patients affected.

KnowRob: A knowledge processing infrastructure for cognition-enabled robots

Abstract: Autonomous service robots will have to understand vaguely described tasks, such as “set the table” or “clean up”. Performing such tasks as intended requires robots to fully, precisely, and appropriately parameterize their low-level control programs. We propose knowledge processing as a computational resource for enabling robots to bridge the gap between vague task descriptions and the detailed information needed to actually perform those tasks in the intended way. In this article, we introduce the KnowRob knowledge processing system that is specifically designed to provide autonomous robots with the knowledge needed for performing everyday manipulation tasks. The system allows the realization of “virtual knowledge bases”: collections of knowledge pieces that are not explicitly represented but computed on demand from the robot's internal data structures, its perception system, or external sources of information. This article gives an overview of the different kinds of knowledge, the different inference mechanisms, and interfaces for acquiring knowledge from external sources, such as the robot's perception system, observations of human activities, Web sites on the Internet, as well as Web-based knowledge bases for information exchange between robots. We evaluate the system's scalability and present different integrated experiments that show its versatility and comprehensiveness.