Die Kontrolle des Umsetzungsgrades des Zugangs- und Zugriffsschutzes

Rechtlich verpflichtende Datenschutzkontrollen im Cloud-Umfeld stellen den Cloud-Nutzer vor eine große Herausforderung. Zusammen mit der Verantwortlichkeit für die in der Cloud verarbeiteten Daten und den immer noch weitverbreiteten Datenschutzbedenken gegen Cloud-Dienste, stellen diese einen Hemmschuh für die Nutzung von Cloud-Diensten dar. Teilautomatisierte Datenschutzkontrollen, die dem Cloud-Nutzer im laufenden Betrieb den Umsetzungsgrad von Datenschutzzielen anzeigen, können dieser Barriere begegnen. Dieser Beitrag schlägt ein Vorgehen für eine teilautomatisierte Messung der Datenschutzziele des Zugangs- und Zugriffsschutzes vor.     

Biosynthesis of Nudicaulins: A 13CO2‐Pulse/Chase Labeling Study with Papaver nudicaule

Nudicaulins are unique alkaloids responsible for the yellow color of the petals of some papaveraceaous plants. To elucidate the unknown biosynthetic origin of the skeleton, a ¹³CO₂‐pulse/chase experiment was performed with growing Papaver nudicaule plants. ¹³C NMR analysis revealed more than 20 multiple ¹³C‐enriched isotopologues in nudicaulins from the petals of ¹³CO₂‐labeled plants. The complex labeling pattern was compared with the isotopologue composition of a kaempferol derivative that was isolated from petals of the same ¹³CO₂‐labeled plants. The deconvolution of the labeling profiles indicated that the nudicaulin scaffold is assembled from products or intermediates of indole metabolism, the phenylpropanoid pathway, and the polyketide biosynthesis. Naringenin‐type compounds and tryptophan/tryptamine are potential substrates for the condensation reaction finally generating the aglycone skeleton of nudicaulins.     

On the intrinsic complexity of point finding in real singular hypersurfaces

In previous work we designed an efficient procedure that finds an algebraic sample point for each connected component of a smooth real complete intersection variety. This procedure exploits geometric properties of generic polar varieties and its complexity is intrinsic with respect to the problem. In the present paper we introduce a natural construction that allows to tackle the case of a non-smooth real hypersurface by means of a reduction to a smooth complete intersection.     

Biomimetic Architectures for the Impedimetric Discrimination of Influenza Virus Phenotypes

Rapid discrimination of avian vs. human phenotypes of emerging influenza A virus isolates with pandemic potential is an important issue in pathogenesis and epidemiology studies of the infection. In this work, functional architectures are tailored on the surface of a gold electrode, introducing receptor molecules as a sensing entity that mimics those found in the membrane of target cells of the influenza A virus and with the aim of developing an impedimetric‐based detector for influenza A virus phenotyping. In a bottom‐up approach, the artificial receptors are built by sequential assembly of a 1‐octanethiol/octyl‐galactoside hybrid bilayer, followed by an enzyme‐mediated functionalization of the terminal galactoside groups with sialic acid molecules. The detection mechanism relies hence on the specific affinity between the sialic acid‐galactose receptor moieties anchored on the modified electrode surface and the hemagglutinin (HA) viral surface protein. By using the appropriate type of sialyltransferase enzyme, sialylation of galactose residues is made through α‐2,3 or α‐2,6 linkages. This permits the envisaged impedimetric detector to discriminate rapidly between avian vs. human strains of influenza A virus with the absence of elaborate sample preparation steps. In contrast to immunosensors based on antibodies as bioreceptor, the sialylated modified gold electrode is also able to distinguish among influenza phenotypes, which could make the here presented detector a reagentless, label‐free diagnostic device for influenza phenotyping.     

Heat and gas transport properties in pelletized hydride–graphite-composites for hydrogen storage applications

Metal hydrides are suitable for the compact, efficient and safe storage of hydrogen. Considering hydride-based hydrogen storage tanks, the enhancement of the heat and gas transport properties of the hydride bed is crucial for increased (un-)loading dynamics of the tank.     

Virtual reality authoring for schools

The paper describes a method for programming behaviours of objects in virtual worlds. It is designed to be easy to use and to shield users from complex coding and syntax errors. It has been tested in a number of projects within schools in Brazil.     

CCVD Synthesis of Carbon‐Encapsulated Cobalt Nanoparticles for Biomedical Applications

Carbon‐encapsulated ferromagnetic Cobalt nanoparticles (Co@C) have been synthesized by catalytic chemical vapour deposition (CCVD). The nanoparticles, mainly ranging between 10 and 15 nm, are tightly encapsulated by 2–3 concentric graphitic carbon shells and protected from oxidation. Because of their magnetic properties (saturation magnetization of 106 emu/g and a coercivity HC of 250 Oe), Co@C nanoparticles have been investigated for hyperthermia application. Although the observed values of the specific absorption rate (28.7 W/gCo@C at 30 kA/m and 215.4 W/gCo@C at 70 kA/m) are slightly lower than required in actual hyperthermia therapies, the observed strong heating effect provides a very promising starting point for future clinical application. It is also demonstrated that these nanoparticles can at the same time be used for magnetic resonance imaging (MRI) with an efficiency comparable to commercially available T2 contrast agents.