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Two-photon microscopy in combination with novel fluorescent labeling techniques enables imaging of three-dimensional neuronal morphologies in intact brain tissue. In principle it is now possible to automatically reconstruct the dendritic branching patterns of neurons from 3-D fluorescence image stacks. In practice however, the signal-to-noise ratio can be… (More)

A major challenge in computational finance is the pricing of options that depend on a large number of risk factors. Prominent examples are basket or index options where dozens or even hundreds of stocks constitute the underlying asset and determine the dimensionality of the corresponding degenerate parabolic equation. The objective of this article is to… (More)

- Malte Wittmann, Gillian Queisser, Anja Eder, J Simon Wiegert, C Peter Bengtson, Andrea Hellwig +2 others
- The Journal of neuroscience : the official…
- 2009

Synaptic activity initiates many adaptive responses in neurons. Here we report a novel form of structural plasticity in dissociated hippocampal cultures and slice preparations. Using a recently developed algorithm for three-dimensional image reconstruction and quantitative measurements of cell organelles, we found that many nuclei from hippocampal neurons… (More)

A class of a posteriori estimators is studied for the error in the maximum-norm of the gradient on single elements when the finite element method is used to approximate solutions of second order elliptic problems. The meshes are unstructured and, in particular, it is not assumed that there are any known superconvergent points. The estimators are based on… (More)

- Volker H Schulz, Georg Hans, Bock, Gabriel Wittum
- 1996

Acknowledgements This thesis has been prepared during my work at the Interdisciplinary Center for Scientiic Computing (IWR) of the Ruprecht-Karls-Universitt at Heidelberg. I would like to thank Prof. H.G. Bock for providing a very creative and inspiring atmosphere within his research group, of which I am lucky enough to be a member. I am indebted to him and… (More)