In: Journal of Phytopathology, 2005, vol. 153, p. 27-36
The reduction of atmospheric sulphur dioxide pollution is causing increasing problems of sulphur deficiency in sulphur-demanding crop plants in northern Europe. Elemental sulphur and many sulphur containing compounds such as cysteine-rich antifungal proteins, glucosinolates (GSL) and phytoalexins play important roles in plant disease resistance. The aim of this work was to analyse the effect of...
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In: Plant Physiology, 2004, vol. 135, p. 95-104
The coordinated induced expression of ß-oxidation genes is essential to provide the energy supply for germination and postgerminative development. However, very little is known about other functions of ß-oxidation in nonreserve organs. We have identified a gene-specific pattern of induced ß-oxidation gene expression in wounded leaves of Arabidopsis. Mechanical damage triggered the local and...
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Thèse de doctorat : Université de Fribourg, 2004 ; no 1467.
The presented work is treating surface scientific aspects of selected materials related to tribology. Tribology is one of the oldest problems humans try to master. It is highly interdisciplinary and there is probably no topic, where so much effort has been put into to gain a deeper understanding. But still, while the role of the surface in tribology is perceived and accepted, a general...
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Thèse de doctorat : Università della Svizzera italiana, 2004 ; 2004ECO001.
In the first part of the thesis, we study the local robustness of inference procedures of the conditional location and scale parameters in a stationary time series model. We first derive optimal bounded-influence estimators for the parameters of conditional location and scale models under a conditionally Gaussian reference model. Based on these results, optimal bounded-influence versions of the...
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In: Plant Molecular Biology, 2005, vol. 54, p. 817-835
Plant secondary metabolism significantly contributes to defensive measures against adverse abiotic and biotic cues. To investigate stress-induced, transcriptional alterations of underlying effector gene families, which encode enzymes acting consecutively in secondary metabolism and defense reactions, a DNA array (MetArray) harboring gene-specific probes was established. It comprised complete sets...
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In: Phytochemistry, 2005, vol. 66, p. 267-277
The process of signal integration, which contributes to the regulation of multiple cellular activities, can be described in a digital language by a set of connected digital operations. In this article we delineate the basic concepts of cell signalling in the context of a logical description of information processing. Newly described instances of signal integration in plants are given as examples....
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In: Journal of Cell Science, 2004, vol. 117, p. 1179-1190
The water pipes of elongating plant organs are the result of programmed cell death and are formed by the walls of dead and empty protoxylem elements. These protoxylem elements are passively elongated many times by the surrounding tissue before they are replaced and collapse. Well-known adaptations for this unique task include the characteristic secondary wall thickenings, forming rings and...
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In: Limnology and Oceanography, 2004, vol. 49, no. 4, p. 1355-1364
Microparasites and epibionts have important implications for the ecology and evolution of their zooplankton host populations. Many parasites and epibionts produce resistant spores that infect new hosts upon intake. We explored the hypothesis that these spores build up dormant stage banks that remain infective for several years (decades). In laboratory experiments, we exposed Daphnia magna to...
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In: Parasitology, 2004, vol. 128, p. 31-38
The fresh-water crustacean Daphnia magna may acquire an infection with the microsporidium Octosporea bayeri either by ingesting spores from the water (horizontally), or directly from its mother (vertically). Due to differences in the time and mechanisms of transmission, horizontal and vertical infections may lead to differences in the growth of the parasite within the host. This may influence...
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In: Proceedings of the Royal Society of London: Biological Sciences, 2004, vol. 271, p. 2149-2155
In metapopulations, only a fraction of all local host populations may be infected with a given parasite species, and limited dispersal of parasites suggests that colonization of host populations by parasites may involve only a small number of parasite strains. Using hosts and parasites obtained from a natural metapopulation, we studied the evolutionary consequences of invasion by single strains...
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