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Currently more than 850 biological databases exist. The majority of biological knowledge is not in these databases but rather contained as free text in scientific literature. For systems biology tasks it is often necessary to integrate and extract data from heterogeneous databases and free text as well as to analyse the information in the context of experimental data. ONDEX is an integration framework which aims to address these challenges by combining features of database integration, text mining and sequence analysis with methods for graph-based data analysis and visualisation. The main topics of this diploma thesis are the redesign of the ONDEX backend, the development of a data exchange format, the development of a query environment and the allocation of Web services for data integration, data exchange and queries. These Web services allow backend workflow control from both local and remote workstations.
Interactive video retrieval
(2006)
The goal of this thesis is to develop a video retrieval system that supports relevance feedback. One research approach of the thesis is to find out if a combination of implicit and explicit relevance feedback returns better retrieval results than a system using explicit feedback only. Another approach is to identify a model to weight existing feature categories. For this purpose, a state-of-the-art analysis is presented and two systems implemented, which run under the conditions of the international TRECVID workshop. It will be a basis system for further research approaches in the field of interactive video retrieval. Amongst others, it shall participate in the 2006 search task of the mentioned workshop.
Die hohen Infrastrukturkosten machen das Überprüfen von Theorien bezüglich großer Rechnernetze zu einer schwierigen und teuren Aufgabe. Ein möglicher Ansatz dieses Problem zu beheben ist die Verwendung von virtueller anstelle von physikalischer Infrastrukur. OPNets IT Guru ist ein Programm, das entworfen wurde zur Simulation großer Netze und zur Repräsentation relevanter Informationen. Es gestattet großflächige Änderungen zu testen oder Theorien zu überpruefen ohne den Aufwand einer physikalischen Infrastruktur.
Due to their confinement to specific host plants or restricted habitat types, Auchenorrhyncha are suitable biological indicators to measure the quality of chalk grassland under different management practices for nature conservation. They can especially be used as a tool to assess the success of restoring chalk grassland on ex-arable land. One objective of this study was to identify the factors which most effectively conserve and enhance biological diversity of existing chalk grasslands or allow the creation of new areas of such species-rich grassland on ex-arable land. A second objective was to link Auchenorrhyncha communities to the different grassland communities occurring on chalk according to the NVC (National Vegetation Classification). Altogether 100 chalk grassland and arable reversion sites were sampled between 1998 and 2002. Some of the arable reversion sites had been under certain grazing or mowing regimes for up to ten years by 2002. Vegetation structure and composition were recorded, and Auchenorrhyncha were sampled three times during the summer of each year using a "vortis" suction sampler. Altogether 110 leafhopper species were recorded during the study. Two of the species, Kelisia occirrega and Psammotettix helvolus, although widespread within the area studied, had not previously been recognized as part of the British fauna. By displaying insect frequency and dominance as it is commonly done for vegetation communities, it was possible to classify preferential and differential species of distinct Auchenorrhyncha communities. The linking of the entomological data with vegetation communities defined by the NVC showed that different vegetation communities were reflected by distinct Auchenorrhyncha communities. Significant differences were observed down to the level of sub-communities. The data revealed a strong positive relationship between the diversity of leafhoppers species and the vegetation height. There was also a positive correlation between the species richness of Auchenorrhyncha and the diversity of plant species. In that context it is remarkable that there was no correlation between vegetation height and botanical diversity. There is a substantial decrease in Auchenorrhyncha species richness from unimproved grassland to improved grassland and arable reversion. The decline of typical chalk grassland and general dry grassland species is especially notable. Consequently, the number of stenotopic Auchenorrhyncha species which are confined to only a few habitat types, are drastically reduced with the improvement of chalk grassland. Improved grassland and arable reversion fields are almost exclusively inhabited by common habitat generalists. The decrease in typical chalk grassland plants due to improvement is mirrored in the decline of Auchenorrhyncha species, which rely monophagously or oligophagously on specific host plants. But even where suitable host plants re-colonize arable reversion sites quickly, there is a considerable delay before leafhoppers follow. That becomes especially obvious with polyphagous leafhoppers like Turrutus socialis or Mocydia crocea, which occur on improved grassland or arable reversion sites only in low frequency and abundance, despite wide appearance or even increased dominance of their host plants. These species can be considered as the most suitable indicators to measure success or failure of long term grassland restoration. A time period of ten years is not sufficient to restore species-rich invertebrate communities on grassland, even if the flora indicates an early success.
In dieser Arbeit werden die Navier-Stokes Gleichungen für instationäre inkompressible Fluide in einem zeitabhängigen Gebiet untersucht.
Das Verhalten des Fluids beeinflusst die Geometrie des Gebietes, indem das Fluid Kräfte (beschrieben durch den Spannungstensor) auf die deformierbare Struktur ausübt.
Die Motivation dazu stammt aus de mathematischen Medizin - Simulation des Blutflusses in Arterien und Venen.
Nach der Auswahl des passenden Modells für den Fluss innerhalb des Kanals mit viskoelastisch-deformierbaren Wänden, wird das Gesamtmodell mathematisch untersucht. Die Existenz schwacher Lösungen wird mithilfe der schwach-kompressiblen Approximation im Gebiet mit gegebener Deformationsfunktion nachgewiesen. Hierbei wir die Fluid-Struktur-Kopplungsbedingung mithilfe des Ansatzes für teilweise permeable Wände approximiert und somit entkoppelt.
Schließlich werden numerische Experimente präsentiert, welche die Konvergenz der Iterationen bezüglich der Funktion der Deformation, wie auch das Verhalten der beweglichen Wand für sinkende Wandpermeabilität illustrieren.
Studies have shown that runoff and spray-drift are important sources of nonpoint-source pesticide pollution of surface waters. Owing to this, public concern over the presence of pesticides in surface and ground water has resulted in intensive scientific efforts to find economical, yet environmentally sound solutions to the problem. The primary objective of this research was to assess the effectiveness of vegetated aquatic systems in providing buffering between natural aquatic ecosystems and agricultural landscape following insecticide associated runoff and spray-drift events. The first set of studies were implemented using vegetated agricultural ditches, one in Mississippi, USA, using pyrethroids (bifenthrin, lambda-cyhalothrin) under simulated runoff conditions and the other in the Western Cape, South Africa using the organophosphate insecticide, azinphos-methyl (AZP), under natural runoff and spray-drift conditions. The second set of studies were implemented using constructed wetlands, one in the Western Cape using AZP under natural spray-drift conditions and the other in Mississippi, USA using the organophosphate MeP under simulated runoff conditions. Results from the Mississippi-ditch study indicated that ditch lengths of less than 300 m would be sufficient to mitigate bifenthrin and lambda-cyhalothrin. In addition, data from mass balance calculations determined that the ditch plants were the major sink (generally > 90%) and/or sorption site for the rapid dissipation of the above pyrethroids from the water column. Similarly, results from the ditch study in South Africa showed that a 180 m vegetated system was effective in mitigating AZP after natural spray drift and low flow runoff events. Analytical results from the first wetland study show that the vegetated wetland was more effective than the non-vegetated wetland in reducing loadings of MeP. Mass balance calculations indicated approximately 90% of MeP mass was associated with the plant compartment. Ninety-six hours after the contamination, a significant negative acute effect of contamination on abundances was found in 8 out of the 15 macroinvertebrate species in both wetland systems. Even with these toxic effects, the overall reaction of macroinvertebrates clearly demonstrated that the impact of MeP in the vegetated wetland was considerably lower than in the non-vegetated wetland. Results from the constructed wetland study in South Africa revealed that concentrations of AZP at the inlet of the 134 m wetland system were reduced by 90% at the outlet. Overall, results from all of the studies in this thesis indicate that the presence of the plant compartment was essential for the effective mitigation of insecticide contamination introduced after both simulated and natural runoff or spray-drift events. Finally, both the vegetated agricultural drainage ditch and vegetated constructed wetland systems studied would be effective in mitigating pesticide loadings introduced from either runoff or spray-drift, in turn lowering or eliminating potential pesticide associated toxic effects in receiving aquatic ecosystems. Data produced in this research provide important information to reduce insecticide risk in exposure assessment scenarios. It should be noted that incorporating these types of best management practices (BMPs) will decrease the risk of acute toxicity, but chronic exposure may still be an apparent overall risk.
Dracaena L. (Ruscaceae) is a predominantly African genus with a smaller centre of diversity in South-East Asia. The taxonomy of the 29 species occurring in Central, East and Southern Africa was revised through phenetic and phylogenetic analyses of the morphology as well as through herbarium, literature and field studies. An infrageneric classification is proposed, in which four sub-genera are recognised for the first time. A taxonomic account for the study area incorporating an identification key, distribution maps and an IUCN Red List assessment is presented. Analysis of Dracaena phytogeography reveals that the Guineo-Congolian centre of endemism is the richest with 21 species while the Maputaland-Pondoland regional mosaic and the Guinea-Congolia/Sudania regional transition zone are the poorest, having only one species each. Investigation of the ecology of Dracaena in the Kakamega Forest, Kenya, shows that it plays an important role in the forest ecology and is an indicator of forest quality.
In the present study the flora and vegetation of Kakamega Forest, an East African rainforest in Western Kenya, was investigated. Kakamega Forest is highly degraded and fragmented and is an ideal model to study the anthropogenic influence on the forest inventory. The main focus was to analyse the influence of human impact on the vascular plant species composition. During five field phases in the years 2001 to 2004 a total of 19 study sites scattered over the whole forest including all fragments were investigated regarding forest structure, species composition and plant communities. The different forest sites were analysed by three different methods, phytosociological relevés, line-transect and with the variable-area transect method. The forest survey revealed about 400 taxa of vascular plant species, among them 112 trees, 62 shrubs, 58 climbers and 114 herbs. Several species are restricted to this forest in Kenya, but only one endemic species, the herb Commelina albiflora, could be discovered. About 15 species were recorded as new for Kenya and probably at least one species is new to science. Kakamega Forest is a unique mixture of Guineo-Congolian and Afromontane floral elements. About one half of the vascular plant species has its origin in the lowland forests of the Congo basin and one third originates from Afromontane habitats. The present study represents the first description of plant communities of Kakamega Forest. An analysis of different forest sites and plantations resulted in 17 different vegetation units. For the mature forest sites eleven plant communities were described. The young succession stage consists of two plant communities. Since the disturbance history and the age of the different plant communities could be estimated, their chronology was also described. An exception are the study sites within the plantations and afforested sites. The four defined vegetation units were not described as plant communities, because they are highly affected by man and do not belong to the natural succession of Kakamega Forest. Nevertheless, the regeneration potential of such forests was investigated. Due to the different succession stages the changing species composition along a disturbance gradient could be analysed. Most of Kakamega Forest consists of middle-aged secondary forest often surrounded by very young secondary forest. A true primary rainforest could not be found due the massive influence by over-exploitation. In all parts of the forest the anthropogenic influence could be observed. The forest develops towards a climax stage, but a 2 Abstract comparison with former surveys shows that the regeneration is much slower than expected. Human impact has to be avoided to allow the forest to develop into a primary-like rainforest. But several climax tree species might be missing anyway, because after the broad logging activities in the past there are not enough seed trees remaining. Species richness was highest in disturbed forest sites. A mixture of pioneer, climax and bushland species could be recorded there. Therefore, a high species richness is not a suitable indicator for forest quality. The proportion of climax species typical for Kakamega Forest would be a better measure. Compared to the main forest block the forest fragments do not lack in diversity as expected due to fragmentation processes. Instead, the only near primary forest could be recorded in Kisere, a northern fragment. The high amount of climax species and the more or less undisturbed forest structure is a result of the strict protection by the Kenya Wildlife Service and due to low logging activities. Differences in species composition between the studied forest sites are either a result of the different logging history or management regime rather than due to different edaphic or climatic conditions.