Klaus G. Schröter

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In root hairs the reduction of turgor pressure inhibits growth in area of the cell wall. After turgor reduction, however, the cell wall substances are still secreted so that apical wall thickenings are formed. Their dimension and ultrastructure depend on the degree of turgor pressure. 3 hours after turgor reduction the polar organisation of the cytoplasm,(More)
Five hours before germination the zygotes of Pelvetia fastigiata adhere to their substrate. A jelly layer covers the entire cell but most of the transparent jelly, artificially outlined by a layer of resin beads, is secreted at the prospective rhizoid pole. If the direction of the growth-orienting light is shifted after the asymmetrical secretion has(More)
In the initial phase of the geotropical reaction of the Chara rhizoid the growth difference postulated by Sievers (1967c) between the physically upper, slightly subapical flank and the lower one is demonstrated. In horizontal exposure the growth of the extreme cell apex is continued, while the growth of the lower flank is inhibited and that of the upper one(More)
In contrast to the statocytes of higher plants, in which amyloplasts function as statoliths, Chara-rhizoids contain statolith vacuoles filled with biocrystallites of BaSO4. This was revealed by qualitative and quantitative electron microprobe analysis, atomic absorption spectrophotometry and selected area electron diffraction. The barium sulphate(More)
Pollutant load modelling for sewer systems is state-of-the-art, especially for the estimation of discharged pollutant loads and development of sewer management strategies. However, conventionally obtained calibration data sets are often not exhaustive and have significant drawbacks. In the Graz West catchment area (Graz, Austria), continuous high-resolution(More)
N The use of shape-defi ning hard templates containing arrays of cylindrical nanopores, such as self-ordered nanoporous anodic aluminum oxide (AAO), [ 1 , 2 ] is a well-established synthetic approach to one-dimensional (1D) nanostructures. [ 3 ] However, generating specifi c functionalities requires control over mesoscopic structure formation processes(More)
We present an algorithm which allows us to identify all possible stable states of the cantilever oscillation of an AFM operated in the intermittent contact mode within the harmonic approximation. The oscillatory states are qualified as quasi-free, net-attractive and net-repulsive solutions. Using a generic model for the tip-sample interaction the influence(More)
We study the effects of interfacial polarization in and upon a self-assembled ion conductor based on a lamellar block copolymer and a lithium salt. Impedance spectroscopy combined with orientation experiments enable a quantitative analysis of ionic polarization and a direct demonstration of its aligning effect on the interfaces. The time constant of the(More)
Reversible polymeric networks can show self-healing properties due to their ability to reassemble after application of stress and fracture, but typically the relation between equilibrium molecular dynamics and self-healing kinetics has been difficult to disentangle. Here we present a well-characterized, self-assembled bulk network based on supramolecular(More)
We present polarization and transient current experiments that allow an independent determination of the charge carrier density and the mobility of ions in polymer electrolytes at low charge carrier density. The method relies on a complete depletion of ions in the bulk electrolyte achieved by applying high voltages. Based on a qualitative model for the(More)