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The single unit doctrine proposes that each one of our percepts and sensations is represented by the activity of specialized high-level cells in the brain. A common criticism applied to this proposal is the one referred to as the "combinatorial problem". We are constantly confronted with unlimited combinations of elements and features, and yet we face no problem in recognizing patterns and objects present in visual scenes. Are there enough neurons in the brain to singly code for each one of our percepts? Or is it the case that perceptions are represented by the distributed activity of different neuronal ensembles? We lack a general theory capable of explaining how distributed information can be efficiently integrated into single percepts. The working hypothesis here is that distributed neuronal ensembles signal relations present in the stimulus by selectively synchronizing their spiking responses. Synchronization is generally associated with oscillatory activity in the brain. Gamma oscillations in particular have been linked to various integrative processes in the visual system. Studies in anesthetized animals have shown a conspicuous increase in power for the gamma frequency band (30 to 60 Hz) in response to visual stimuli. Recently, these observations have been extended to behavioral studies which addressed the role of gamma activity in cognitive processes demanding selective attention. The initial motivation for carrying out this work was to test if the binding-by-synchronization (BBS) hypothesis serves as a neuronal mechanism for perceptual grouping in the visual system. To this aim we used single and superimposed grating stimuli. Superimposed gratings (plaids) are bi-stable stimuli capable of eliciting different percepts depending on their physical characteristics. In this way, plaids can be perceived either as a single moving surface (pattern plaids), or as two segregated surfaces drifting in different directions (component plaids). While testing the BBS hypothesis, we performed various experiments which addressed the role of both stimulus and cortical architecture on the properties of gamma oscillations in the primary visual cortex (V1) of monkeys. Additionally, we investigated whether gamma activity could also be modulated by allocating attention in time. Finally, we report on gamma-phase shifts in area V1, and how they depend on the level of neuronal activation. ...
Die vorliegende Dissertation analysiert Großinvestorhandelsstrategien in illiquiden Finanzmärkten. Ein Großinvestor beeinflusst die Preise der Wertpapiere, die er handelt, so dass der daraus resultierende Feedbackeffekt berücksichtigt werden muss. Der Preisprozess wird durch eine Familie von cadlag Semimartingalen modelliert, die in dem zusätzlichen Parameter stetig differenzierbar ist. Ziel ist es, eine möglichst allgemeine Strategiemenge zu bestimmen, für die eine Vermögensdynamik definiert werden kann. Es sind dies vorhersehbare Prozesse von wohldefinierter quadratischer Variation entlang Stoppzeiten. Sie erweisen sich als laglad. Die Vermögensdynamikzerlegung zeigt, dass bei stetigen adaptierten Strategien von endlicher Variation (zahme Strategien) die quadratischen Transaktionskostenterme verschwinden und der Gewinnprozess nur noch aus einem nichtlinearen stochastischen Integral besteht. Es wird gezeigt, unter welchen Bedingungen gewisse Approximationen vorhersehbarer laglad Strategien durch adaptierte stetige Strategien von endlicher Variation möglich sind. Im Fall, dass der Approximationsfehler für die Risikoeinstellung des Großinvestors erträglich ist, kann er seine Investmentziele durch Verwendung dieser zahmen Strategien, Liquiditätskosten vermeidend, erreichen. In diesem Fall ist der Gewinnprozess durch das nicht-lineare stochastische Integral gegeben.
Stop Making Sense : USA 1984
(2010)
Die Aufzeichnungen zu "Stop Making Sense" fanden an drei Abenden im Dezember 1983 im Pantages Theatre in Hollywood statt. David Byrne und seine Band machten dort im Rahmen der Promotiontour zu ihrem damals neuem Album 'Speaking in Tounges' Station. Als Regisseur holten sich die Talking Heads den filmerfahrenen Jonathan Demme, der später auch Blockbuster wie "The Silence of the Lambs" und "Philadelphia" schuf, und den Kameramann Jordan Cronenweth (Blade Runner) in die Tourneecrew. "Stop Making Sense" ist Demmes Dokumentarfilm-Debüt.
Strange Passion
(2010)
In Strange Passions John Ngong Kum Ngong's vocation and prime obsession remain constant - the soul of the nation. Passion, the central symbol in this collection is the patriotic sentiment in its various manifestations. As a self-conscious artist, Ngong summons his audacious technical dexterity to sublimate the sauciness characteristic of his style and direct it towards ideological ends. The significance of his contribution is as much in the urgency, originality and authenticity of his message as in the full range and complexity of his style, and the depth and density of his thoughts.
Stranger in his Homeland
(2010)
Stranger in His Homeland completes the long-awaited trilogy of Linus Asong's fictitious village of Nkokonoko Small Monje, separately treated in The Crown of Thorns and its sequel A Legend of the Dead. However, it leads us back not to events after A Legend of the Dead, but to the crisis that created the passionately exciting The Crown of Thorns. Honest, enthusiastic, arrogant and self-righteous, Antony Nkoaleck, the first graduate of his tribe means well. But his society, entrenched in corruption, sees things differently and therefore judges him according to its own norms. Just one or two errors on Antony's part are enough to cost him his job with the government, the coveted throne of Nkokonoko Small Monje, and finally his life. It is a sad story, strongly reminiscent of Myshkin's fate in Dostoevysky's novel The Idiot, a story in which the Russian novelist vividly shows the inability of any man to bear the burden of moral perfection in an imperfect world.
The article analyses A. Boissier's image "Les Amants électrisés par l'amour" in view of the larger question of how something is able to arouse interest on first sight, but also in repeat encounters. Highlighting the engraving's didactic iconography, the article shows how it revolves around the solution to a riddle and uses a typical design of the Enlightenment to show the uncovering of a deception. As such, the engraving is part of a long tradition of showing (supposedly) supernatural events, more specifically the tradition of Magia naturalis. At the same time, the image contains dissonances and can be seen to simulate suspense through dichotomies that can be identified as antagonistic historical concepts. The article furthermore discusses the amalgamation of love and electricity in contemporary discourses and addresses the temporal dimension of the engraving, which constructs itself out of an absence, out of something yet unseen.
Strengthening popular participation in the African Union : a guide to AU structures and processes
(2010)
The African Union (AU) has committed to a vision of Africa that is 'integrated, prosperous and peaceful - driven by its own citizens, a dynamic force in the global arena' (Vision and Mission of the African Union, May 2004). This guide is an effort to take up the challenge of achieving this vision. It is a tool to assist activists to engage with AU policies and programmes. It describes the AU decision-making process and outlines the roles and responsibilities of the AU institutions. It also contains a sampling of the experiences of those non-governmental organisations (NGOs) that have interacted with the AU.
This European Policy Analysis discusses the need to strengthen the institutions underpinning the euro and makes several policy recommendations. The Stability and Growth Pact must be reinforced, have greater automaticity and entail graduated sanctions. Fiscal surveillance must be improved through the establishment of a European Fiscal Stability Agency. Finally, the European Financial Stability Facility must be made permanent.
Employing NMR spectroscopy, it is not only possible to calculate the three dimensional structures of single proteins, but also to study dynamics and conformational changes of protein-complexes. In fact that is an important aspect, since the protein function depends on dynamics and interactions with other molecules. Therefore the study of protein-protein interactions is of highest importance for a better understanding of biological processes. Based on NMR methods, in this thesis we were able to determine protein-protein interactions within the enterobacterial Rcs signalling complex which is regulated via a phosphorelay. Originally identified as regulator of capsule synthesis, the Rcs phosphorelay is now considered to be implicated in stress response caused by disturbances in the peptidoglycan layer. Beyond that the Rcs system is involved in multiplex transcriptional networks including cell division, motility, biofilm formation and virulence. Because of such global nature and its extraordinary structural organisation involving membrane integrated sensor proteins (RcsC, RcsD), coactivators (RcsF, RcsA) and a transcription factor (RcsB), the Rcs system is one of the most remarkable phosphorelays in the family of enterobacteriacaea. During the complex phosphotransfer the histidine phosphotransferase (HPt) domain of the intermediary RcsD protein mediates the phosphotransfer between RcsC and RcsB, and probably modulates the phosphorylation state of the response regulator RcsB. Therefore the present work has been focused on the interface between RcsD and RcsB in more detail. In the first part of the thesis a new domain within the RcsD protein has been identified and structurally analysed by liquid NMR spectroscopy. RcsD is an inner membrane bound hybrid sensor like-kinase composed of a periplasmic sensor domain and a cytoplasmic portion. The cytoplasmic part contains the histidine like-kinase (HK) domain and the histidine phosphotransferase (HPt) domain. By analysis of the secondary structure in more detail, it was shown here that the two domains are intermitted by an additional 13.3 kDa domain. Corresponding to the position of the ABL (α−β−loop) domain of RcsC, located C-terminal to the RcsC-HK domain, the new identified domain was named RcsD-ABL. The central structural element of RcsD-ABL is a β-sheet composed of six strands with a β1−β2−β3−β4−β6−β5 topology and surrounded by two α-helices α1 and α2. In the second part of the thesis, RcsD-ABL is identified as a binding domain for the response regulator RcsB by NMR titration experiments. Such a binding domain for a response regulator has so far only been described for the histidine kinase CheA. In reportergene assays with β-galactosidase and ONPG as substrate it was shown that overexpression of RcsD-ABL in high amounts inhibited binding of RcsB to its target promoter. The β-galactosidase activity was reduced by 80 % with respect to cells carrying no plasmid encoding RcsD-ABL. The mapping of the binding interface was successfully achieved by chemical shift perturbations, a fast mapping protocol and selective labelling. It was shown that the interaction between RcsD-ABL and RcsB takes place via a binding interface comprising mainly the two α-helices of RcsD-ABL and the α-helices α7, α8 and α10 in the effector domain of RcsB. In the third part of the thesis, the interaction of RcsB with RcsD-ABL was related to that with RcsD-HPt. Using NMR titration experiments and ITC measurements, a comparison of the binding constants (Kd) of RcsB interacting either with the isolated RcsD-ABL (2 PM) or the isolated RcsDHPt domain (40 PM) revealed a higher affinity of RcsD-ABL to RcsB. A conjugate of RcsD-ABL-HPt interacting with RcsB decreased the Kd in the one-site fitting mode to 10 PM. However, the two-site fitting mode applied for RcsD-ABL-HPt/RcsB interaction resulted in a Kd (RcsD-ABL) of 2 PM and a Kd (RcsD-HPt) of 8 PM, indicating that RcsD-ABL enhances the binding of RcsD-HPt to RcsB. In the last part of the thesis, it was partly possible together with the data obtained from NMR titration experiments, PRE measurements and a HADDOCK protocol to develop a geometrical model for the interaction of RcsD with RcsB. In this model the receiver domain of RcsB interacts with the RcsD-HPt domain and the RcsB effector domain interacts with the RcsD-ABL domain. These results lead to surprising insights on the regulation of phosphorelays, since normally the effector domain binds to DNA. Here the effector domain is recognized by the newly identified RcsD-ABL domain. Prospectively, further investigations of phosphorylation affects and mutational studies will be of great interest.