The synthesis of glycerolipids starts with the acylation of lipid backbones. Two structurally different glycerolipids emerge in the cell: ether-lipids and ester-lipids. In the case of ether-lipids the first fatty acid is substituted with a fatty alcohol inside the peroxisome. By the characterization of the protein FARAT in this thesis, a key enzyme in etherlipid-synthesis was identified for D. discoideum. FARAT shows a peroxisomal localization and is in principle able to do two jobs. Firstly, it initiates the peroxisomal ...

Die circadiane Uhr terrestrischer Organismen erlaubt die Anpassung von Physiologie und Verhalten an 24 h Rhythmen der Umwelt wie beispielsweise den täglichen Licht-Dunkel-Wechsel. Rhyparobia maderae wurde als Organismus zur Forschung an der inneren Uhr etabliert. Die circadiane Uhr der Madeira Schabe ist die akzessorische Medulla (AME) im optischen Lobus, welche von etwa 240 Neuronen innerviert wird. Diese Neuronen exprimieren und kolokalisieren auffällig viele Neuropeptide, die als Neuromodulatoren/Neurotransmitter ...

In 2009, our group published two stable N-heterocyclic carbenes (NHCs) with a 1,1'-ferrocenediyl backbone (fc), which formally exhibit a six-membered FeIIC2N2CII-heterocycle. The stabilization of the fcNHCs is favored by bulky N-substituents. So far neopentyl and 2-adamantyl have been used for this purpose - a bulky primary and secondary alkyl substituent. In contrast to other cyclic diaminocarbenes, the fcNHCs are capable of activating small molecules such as NH3 or CO. The reason for this remarkable ability is the ...

Every quantum system inevitably interacts with its environment. This is a fundamental requirement that allows us to control, measure and, in general, interact with quantum systems. In that respect, a quantum system's openness can be interpreted as prerequisite that enables quantum technologies in the first place. The latter are built to harness the intrinsic quantum mechanical behavior of quantum devices in order to build new, powerful technologies. However, a quantum system's openness also causes it to interact ...

Vorlesungsskript zur Vorlesung „Lineare Algebra und Analytische Geometrie“ an der Universität Kassel im Sommersemester 2020. Es handelt sich um die Druckversion.

A Laurent-Puiseux series $$ \sum\limits_{n = n_0}^{\infty }{a_n (z - z_0)^{n/k} (a_n \in K, k \in ℕ, n_0 \in ℤ ) } \quad (1) $$ where $ k $ denotes the corresponding Puiseux number and $ K $ an infinite computable field - mostly $ K= ℚ(α_1,\ldots,α_n) $ : a field of rational functions in several variables, is mainly characterized by the general coefficient. We consider the case where an is a term of an m-fold hypergeometric sequence. That is $ a_{n+m} = r(n) a_n $ for all sufficiently large integers $ n, r(n) $ ...

In Rahmen dieser Arbeit wurden Phosphole mit unterschiedlichen Funktionalisierungen hergestellt und charakterisiert. Die Verwendung von unsymmetrisch substituierten 1,4-Diinen resultierte in Produkten, die aufgrund ihres Substitutionsmusters ein stereogenes Zentrum am Phosphoratom besitzen. Phosphole, insbesondere ihre β-H-Derivate, zeichnen sich durch ihre exzellenten lumineszenten Eigenschaften aus. Diese machen sie für vielfältige Anwendungen interessant. So gibt es im Bereich der OLED-Entwicklung bereits ...

Der Übergang von mikroskopischen zu makroskopischen Systemen ist in den Naturwissenschaften von grundlegendem Interesse, da im zugehörigen Übergangsbereich größenabhängige Entwicklungen physikalischer Eigenschaften sowie auch gänzlich neue Prozesse auftreten. Edelgascluster ermöglichen einen experimentellen Zugang zur Untersuchung dieses Zwischenbereichs. Die durch Van-der-Waals-Kräfte gebundenen inerten Edelgasatome fungieren als Prototypsysteme zur Untersuchung derartiger fundamentaler Prozesse. Sie werden mittels ...

The so-called Dixon system is often cited as an example of a two-dimensional (continuous) dynamical system that exhibits chaotic behaviour, if its two parameters take their value in a certain domain. We provide first a rigorous proof that there is no chaos in Dixon's system. Then we perform a complete bifurcation analysis of the system showing that the parameter space can be decomposed into sixteen different regions in each of which the system exhibits qualitatively the same behaviour. In particular, we prove that ...

Over a decade ago the frontiers of ultrashort physics and nonlinear optics have reached the attosecond timescale ($1 as = 10 ^ {-18} s$) . Currently, in order to generate isolated attosecond pulses, an intense femtosecond pulse is focused in a jet of a noble gas. Given the sufficient intensity, this leads to high harmonic generation (HHG), which can be filtered (gated) to create a single isolated attosecond pulse. The laser source for the driver pulses has to fulfill two requirements: the pulses need to be limited ...