IT-Sicherheit an der Hochschule Wismar

Inhaltsverzeichnis: Dietrich Nöthens: Analyse und Bewertung der Anforderungen an das Sicherheitsniveau der Informationssysteme an einer Hochschule zur Ableitung der Sicherheitsstrategie ... 4 - Ulrike Mauritz: Offene Türen im Netz - Untersuchungen zur Gewährleistung der Sicherheit in den IuK-Systemen am Beispiel ausgewählter Fachbereiche ... 1

Bacterial colonization of gel particles in the sea ice of Fram Strait

The Fram Strait is characterized by seasonal ice cover, influenced by cold Arctic waters flowing southward on the western margin and warm Atlantic waters flowing northward on the eastern margin. A key component of sea ice ecology is the organic particles and their bacterial communities, about which little is known. We investigated the within-ice distribution of transparent exopolymeric particles (TEP, primarily polysaccharide) and Coomassie stainable particles (CSP, primarily protein) as well as parameters affecting their respective abundance within sea ice. We then explored differences in the bacterial community composition associated with TEP and CSP, compared to free-living bacteria in early summer sea ice of Fram Strait. Photometric and microscopic analysis of gel particles indicated highest TEP and CSP values in landfast ice and lowest values in small ice floes floating on cold Arctic and warm Atlantic waters, respectively (only significant for CSP). TEP were generally found in the bottom half of sea ice, dominating in terms of particle number and area, whereas CSP were evenly distributed, dominating in the top half of sea ice in terms of particle area. TEP values were significantly correlated with indices of recent productivity such as chlorophyll a, POC and PON concentrations. CSP values were less obviously dependent on the productivity of the system. Instead, CSP seemed driven more by low temperature and low light, possibly conditions negatively affecting the survival of sea ice microorganisms generally. Fluorescence in-situ hybridization and particle-specific staining methods were combined to investigate the bacterial community directly living attached to either TEP or CSP. The composition of particle-associated bacteria was different from that of free-living bacteria, but was dominated by the same bacterial groups, Bacteroidetes and ɣ-proteobacteria. Polaribacter spp. was the only genus significantly reduced on particles. We found minor preferences of some bacterial groups for either TEP or CSP, none of which was significant.Distribution patterns and drivers of TEP and CSP suggest different roles of these particles in sea ice. Since no complete shifts in bacterial community composition were observed, we conclude that sea ice selects for bacteria able to acclimate rapidly to changing conditions

Evaluation und Qualitätskontrolle bibliothekarischer Auskunft oder: „Bitte recherchieren Sie selbst im Google“

Der vorliegende Bericht ist das Ergebnis einer Projektarbeit von Studierenden am Institut für Informationswissenschaft der Fachhochschule Köln im Studiengang Bibliothekswesen. Im Rahmen dieser Arbeit untersuchten sieben Studierende während des Sommersemesters 2011 die bibliothekarische Auskunft anhand eines zu diesem Zwecke erstellten Kriterienkatalogs. Die sieben Studierenden testeten die Bibliotheken über vier verschiedene Auskunftskanäle (Chat, Persönliche Auskunft, Telefonische Auskunft und Webformular/E-Mail-Auskunft). Zuerst werden der Kriterienkatalog und dessen Anforderungen sowie der Bewertungsbogen für die Tests vorgestellt. Im folgenden Kapitel steht die Erarbeitung der Testfragen, die zur Bewertung des Auskunftsprozesses gestellt wurden, im Fokus. Es wird eine quantitative Übersicht aller Fragen pro Auskunftskanal und Bibliothekstyp gegeben. Anschließend werden die gestellten Testfragen aufgelistet und erläutert. Zudem werden die Erfahrungen des Pretests sowie die Testphase erläutert. Im nächsten Kapitel erfolgt die Auswertung der gesamten Untersuchung. Die Analysen und Ergebnisse werden jeweils durch Torten- oder Säulendiagramme visualisiert. Fazit und Ausblick runden die Ergebnispräsentation ab. Im Anhang befinden sich eine Auflistung der Auskunftstypen und Bibliothekstypen, das zu Grunde liegende Notenschema, die Auswertungsbögen sowie zwei Erfahrungsberichte der Auskunft jeder Studierenden

The Quaternary of the southwest German Alpine Foreland (Bodensee-Oberschwaben, Baden-Württemberg, Southwest Germany)

Das Quartär der Bodensee-Region besteht aus Schottern frühpleistozäner alpiner Flusssysteme (Deckenschotter) sowie aus glazialen und Schmelzwasser-Ablagerungen der mittel- und spätpleistozänen Eiszeiten. Sie belegen den landschaftlichen Wandel von einer Art Rampe aus Vorbergen hin zur heutigen Topographie mit ineinander greifenden, übertieften Becken, sodass sich eine Art Amphitheater ergibt. Die Deckenschotter als älteste Ablagerungen dokumentieren einerseits die Eintiefung der alpinen Flüsse in diversen Terrassenstufen im Sedimentationsgebiet, andererseits durch deutliche Unterschiede im Geröllspektrum die Vergrößerung des Liefergebiets des sich entwickelnden alpinen Rheins. Der älteste Till kommt vor in Kontakt mit Mindel-Deckenschottern, es gibt jedoch keine Hinweise auf eine glaziale Übertiefung in dieser Zeit. Die meisten glazialen und Schmelzwasser-Ablagerungen werden drei großen Vergletscherungen des Rheingletschers zugeordnet. Diese Vorlandvergletscherungen sind mit drei Generationen glazialer Becken verknüpft. Die ältesten Becken sind zur Donau orientiert, die aus der letzten Vereisung entwässern zum Rhein. Diese Reorientierung bewirkte die hervorragende räumliche Auflösung der Sedimente und Formen. Traditionell wurden die Sedimente in einem chronostratigraphischen System aus glazialen und interglazialen Stufen beschrieben. Unsere Ziele in dieser Arbeit sind, eine Aktualisierung des chronostratigraphischen Systems vorzustellen, das neue, beim geologischen Dienst von Baden-Württemberg angewandte, lithostratigraphische Schema zu erklären und die wichtigsten neuen Einheiten kurz zu beschreiben.researc

Ureteroscopic and Scanning Electron Microscopical Findings in Ureteral Anastomoses After Segment Resection

In an experimental study on 8 canine ureters, end-to-end anastomoses were performed after segmental resection between 9 and 13 cm, using two different surgical techniques. After 3 months of observation the three-dimensional structure of the anastomosis and the surrounding areas was investigated by ureteroscopy and scanning electron microscopy. 3 types could be differentiated by the morphologic features of the ureteral lumen: normal width, segmental stricture, and circumferential stricture. The results offer a plausible explanation for the occasional discrepancy between histologic findings of relatively normal lumen width, and functional disorders apparently reflecting ureteral stenosis. They further support that excellent functional and morphologic reconstruction can be achieved even under the extreme conditions of 13 cm segmental resection with obligatory anastomosis under tension. The findings connected with dilatations observed distal to the anastomotic site appear rather contradictory, their interpretation is difficult

High‐resolution reflection seismics reveal the structure and the evolution of the Quaternary glacial Tannwald Basin

Over-deepened basins exist throughout the Alpine realm. Improving our knowledge on these basins is of high social relevance, since these areas are often well-populated and they possess, for instance, unusual hydrological settings. Nonetheless, geophysical and sedimentological investigations of over-deepened basins are rare. We analyse the sedimentary succession of such a basin, the Tannwald Basin, through geological interpretation of seismic reflection profiles. The basin is located approximately 60 km north of the European Alps. It was incised into Tertiary molasse sediments by the Rhine Glacier and later filled by glacial, fluvial, and lacustrine deposits of 250 m thickness. The Leibniz Institute for Applied Geophysics acquired a grid of five high-resolution seismic reflection lines that imaged till the deepest parts of the Tannwald Basin. The seismic profiles, processed to a pre-stack depth migration level, allow a detailed geological interpretation that is calibrated with the help of a nearby borehole. We determine the structure and the seismic facies of the sediment succession in the basin and presume the following hypothesis of the evolution of the basin: sub-glacial erosion comprises the excavation of the over-deepened basin as well as detachment of large fragments of molasse material. These molasse slabs were deposited within the basin in a layer of basal till that graded upwards in water-lain till and fine-grained deposits. During the last two glaciations, the basinal structure became buried by till sequences and glacio-fluvial sediments

Multiscale imaging reveals the presence of autophagic vacuoles in developing maize endosperm

Cereal endosperm is solely devoted to the storage of proteins and starch that will be used by the embryo upon germination. The high degree of specialization of this tissue is reflected in its endomembrane system, in which ER derived protein bodies and protein storage vacuoles (PSVs) are of particular interest. In maize seeds, the main storage proteins are zeins, that form transport incompetent aggregates within the ER lumen and finally build protein bodies that bud from the ER. In contrast to the zeins, the maize globulins are not very abundant and the vacuolar storage compartment of maize endosperm is not fully described. Whereas in other cereals, including wheat and barley, the PSV serves as the main protein storage compartment, only small, globulin-containing PSVs have been identified in maize so far. We present here a multi-scale set of data, ranging from live-cell imaging to more sophisticated 3D electron microscopy techniques (SBF-SEM), that has allowed us to investigate in detail the vacuoles in maize endosperm cells, including a novel, autophagic vacuole that is present in early developmental stages

Light and freshwater discharge drive the biogeochemistry and microbial ecology in a sub-Arctic fjord over the Polar night

The polar night has recently received increased attention as a surprisingly active biological season. Yet, polar night microbial ecology is a vastly understudied field. To identify the physical and biogeochemical parameters driving microbial activity over the dark season, we studied a sub-Arctic fjord system in northern Norway from autumn to early spring with detailed monthly sampling. We focused on the impact of mixing, terrestrial organic matter input and light on microbial ecosystem dynamics. Our study highlights strong differences in the key drivers between spring, autumn, and winter. The spring bloom started in March in a fully mixed water column, opposing the traditional critical depth hypothesis. Incident solar radiation was the key driver maximum Chlorophyll was reached in April. The onset of the autumn phytoplankton bloom was controlled by vertical mixing, causing nutrient upwelling and dilution of zooplankton grazers, which had their highest biomass during this time. According to the dilution-recoupling hypothesis grazer dilution reduced grazing stress and allowed the fall bloom formation. Mixing at that time was initiated by strong winds and reduced stratification as a consequence of freezing temperatures and lower freshwater runoff. During the light-limited polar night, the primary production was extremely low but bacteria continued growing on decaying algae, their exudates and also allochthonous organic matter. A melting event in January could have increased input of organic matter from land, supporting a mid-winter bacterial bloom. In conclusion, polar night biogeochemistry and microbial ecology was not only driven by light availability, but strongly affected by variability in reshwater discharge and allochthonous carbon input. With climate change freshwater discharge will increase in the Arctic, which will likely increase importance of the dynamics described in this study