Cyclopentyl substituted silanetriol can be prepared and isolated. Its condensation yields the corresponding disiloxanetetrol as a primary condensation product. Further condensation leads to the hexameric polyhedral silsesquioxane cage T6. The latter has been mentioned in the literature before however, lacking structural data. All compounds have been characterized with multinuclear NMR spectroscopy and, in addition, the molecular structures have been determined in the case of the disiloxanetetrol and the hexasilsesquioxane ...

LIMA steht für "LehrInnovation in der Studieneingangsphase 'Mathematik im Lehramtsstudium' – Hochschuldidaktische Grundlagen, Implementierung und Evaluation". Hinter dem Akronym verbirgt sich ein interdisziplinäres Gemeinschaftsprojekt der Universitäten Paderborn und Kassel. Es begann im Januar 2009 und endete im August 2012. Gefördert wurde LIMA vom Bundesministerium für Bildung und Forschung (BMBF) im Rahmen der „Zukunftswerkstatt Hochschullehre“. Das übergeordnete Ziel des Vorhabens war, den Studienbeginn für ...

Bei abelschen t-Moduln über Funktionenkörpern, denen der Ring F_q[t] zugrunde liegt, spielt die Frage der Uniformisierbarkeit eine wichtige Rolle. In dieser Arbeit werden t-Moduln betrachtet, die durch t = τ^2 + A τ+ θ gegeben sind, wobei τ den q-Frobenius-Endomorphismus bezeichnet, A eine (d x d)-Matrix mit d = 2 ist und θ eine Unbestimmte über F_q ist, die als Skalar (der t entspricht) im Funktionenkörper F_q(( 1/θ )) aufgefasst wird. Nach einem Satz von Anderson aus der grundlegenden Arbeit “t-motives” (1986) ...

The thesis at hand investigates the suitability of quantum dot (QD) material for use in long-distance coherent communication. The thesis was written in the frame of the SASER project MONOLOP that is aiming for a compact, monolithically integrated light source with a tunable wavelength covering the C+-band and narrow spectral linewidth below 500 kHz. The thesis reviews the theoretical background of quantum dot material based on the InP material system and distributed feedback (DFB) lasers with lateral gratings as ...

In der vorliegenden Arbeit wurde versucht, die optimalen Wachstumsbedingungen des Pilzes H. fraxineus (Haupterreger des Eschentriebsterbens) zu ermitteln. Dafür wurden drei Wachstumsversuche (Nährmedium, pH-Wert und Temperatur) an 25 Pilzstämmen durchgeführt. • Die Ergebnisse des Nährmediumwachstumsversuches zeigten, dass Maismehl Agar Medium (MmA) die schnellste Kultivierung des Pilzes förderte und als das optimale Nährmedium gelten kann (im Vergleich mit den anderen sechs geprüften Nährmedien). • Der pH-Wert-Versuch ...

Background: Understanding the evolution and development of morphological traits of the last common bilaterian ancestor is a major goal of the evo-devo discipline. The reconstruction of this “urbilaterian” is mainly based on comparative studies of common molecular patterning mechanisms in recent model organisms. The NK homeobox genes are key players in many of these molecular pathways, including processes regulating mesoderm, heart and neural development. Shared features seen in the expression patterns of NK genes ...

Diamond is a material with excellent properties due to its structure and composition. Its crystal lattice is a perfect host of different defect centers, so-called color centers, whose properties, especially the capability of emitting single photons, can serve in quantum information technologies (QIT). As a high refractive index material only a small part of the photons emitted by these color centers in diamond can be collected. To enhance the photon collection efficiency photonic structures are necessary. They can ...

Since humans have begun to explore nature, they came up with new ways and tools, which have been permanently improved. At some point, those tools allowed to look into the microworld and to study the quantum nature of matter. One of such tools to explore the quantum world is the light amplification by stimulated emission of radiation (laser). Since the first lasers were built almost 60 years ago, their capabilities improved permanently, allowing the study of hitherto-unknown physical phenomena. Two of such ...

Comprehensive knowledge of biodiversity is a prerequisite for its long-term conservation and sustainable use. Fungi play crucial roles in ecosystems and are among the species-richest organism groups on Earth. However, all aspects of their diversity remain underexplored. In this study, we aimed to fill the gaps in occurrence data and taxonomy as well as in understanding spatial diversity patterns of aphyllophoroid fungi (non-gilled macroscopic Basidiomycota). We digitized and made openly accessible 4,041 records of ...

Background: Due to their phylogenetic position as one of the closest arthropod relatives, studies of the organisation of the nervous system in onychophorans play a key role for understanding the evolution of body segmentation in arthropods. Previous studies revealed that, in contrast to the arthropods, segmentally repeated ganglia are not present within the onychophoran ventral nerve cords, suggesting that segmentation is either reduced or might be incomplete in the onychophoran ventral nervous system. Results: ...