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Université de Fribourg

Signal signature and transcriptome changes of Arabidopsis during pathogen and insect attack

Vos, Martin de ; Oosten, Vivian R. van ; Poecke, Remco M. P. van ; Pelt, Johan A. van ; Pozo, Maria J. ; Mueller, Martin J. ; Buchala, Antony J. ; Métraux, Jean-Pierre ; Loon, L. C. van ; Dicke, Marcel ; Pieterse, Corné M. J.

In: Molecular Plant-Microbe Interactions, 2005, vol. 18, p. 923

Plant defenses against pathogens and insects are regulated differentially by cross-communicating signaling pathways in which salicylic acid (SA), jasmonic acid (JA), and ethylene (ET) play key roles. To understand how plants integrate pathogen- and insect-induced signals into specific defense responses, we monitored the dynamics of SA, JA, and ET signaling in Arabidopsis after attack by a...

Université de Fribourg

The epidermis-specific extracellular BODYGUARD controls cuticle development and morphogenesis in Arabidopsis

Kurdyukov, Sergey ; Faust, Andrea ; Nawrath, Christiane ; Bär, Sascha ; Voisin, Derry ; Efremova, Nadia ; Franke, Rochus ; Schreiber, Lukas ; Saedler, Heinz ; Métraux, Jean-Pierre ; Yephremov, Alexander

In: The Plant Cell, 2006, vol. 18, p. 321

The outermost epidermal cell wall is specialized to withstand pathogens and natural stresses, and lipid-based cuticular polymers are the major barrier against incursions. The Arabidopsis thaliana mutant bodyguard (bdg), which exhibits defects characteristic of the loss of cuticle structure not attributable to a lack of typical cutin monomers, unexpectedly accumulates...

Université de Fribourg

Enhancing Arabidopsis salt and drought stress tolerance by chemical priming for its abscisic acid responses

Jakab, Gabor ; Ton, Jurriaan ; Flors, Victor ; Zimmerli, Laurent ; Métraux, Jean-Pierre ; Mauch-Mani, Brigitte

In: Plant Physiology, 2005, vol. 139, p. 267

Drought and salt stress tolerance of Arabidopsis (Arabidopsis thaliana) plants increased following treatment with the nonprotein amino acid β-aminobutyric acid (BABA), known as an inducer of resistance against infection of plants by numerous pathogens. BABA-pretreated plants showed earlier and higher expression of the salicylic acid-dependent PR-1 and PR-5 and the...

Université de Fribourg

Small-angle neutron scattering on a core-shell colloidal system: a contrast-variation study

Zackrisson, M. ; Stradner, Anna ; Schurtenberger, Peter ; Bergenholtz, Johan

In: Langmuir, 2005, vol. 21(23), p. 10835

Small-angle neutron scattering (SANS) measurements are reported on a sterically stabilized, core-shell colloidal system using contrast variation. Aqueous dispersions of polystyrene particles bearing grafted poly(ethylene glycol) (PEG) have been studied over a large range of particle concentrations and two different solvent conditions for the PEG polymer. SANS data are analyzed quantitatively by...

Université de Fribourg

Referee networks and their spectral properties

Slanina, F. ; Zhang, Yi-Cheng

In: Acta Physica Polonica B, 2005, vol. 36(9), p. 2797

The bipartite graph connecting products and reviewers of that product is studied empirically in the case of amazon.com. We find that the network has power-law degree distribution on the side of reviewers, while on the side of products the distribution is better fitted by stretched exponential. The spectrum of normalised adjacency matrix shows power-law tail in the density of states. Establishing...

Université de Fribourg

Design and performance of laser-pumpedCs-magnetometers for the planned UCN EDMExperiment at PSI

Groeger, Stephan ; Bison, Georg ; Weis, Antoine

In: Journal of Research of the National Institute of Standards and Technology, 2005, vol. 110, p. 179

We designed laser-pumped cesium vapor magnetometers in the Mx configuration for the control and stabilization of magnetic field fluctuations and gradients in a new experiment searching for a permanent electric dipole moment of the neutron. The intrinsic sensitivity of the device was determined to be 30 fT in a measurement bandwidth of 1 Hz, limited by laser noise. In the shot noise...

Université de Fribourg

Goal synchronization of bimanual skills depends on proprioception

Kazennikov, Oleg V. ; Wiesendanger, Mario

In: Neuroscience Letters, 2005, vol. 388, p. 153

The present experiments in Human subjects were designed to test whether proprioceptive feedback plays a role in optimising bimanual synchronization in a goal-oriented familiar task. Goal-synchronization is a typical feature of bimanual everyday skills. The purpose of the study was to disturb proprioceptive signalling by means of vibrating the leading left limb while subjects performed a bimanual...

Université de Fribourg

Coordination of bowing and fingering in violin playing

Baader, Andreas P. ; Kazennikov, Oleg ; Wiesendanger, Mario

In: Cognitive Brain Research, 2005, vol. 23(2-3), p. 436

Playing string instruments implies motor skills including asymmetrical interlimb coordination. How special is musical skill as compared to other bimanually coordinated, non-musical skillful performances? We succeeded for the first time to measure quantitatively bimanual coordination in violinists playing repeatedly a simple tone sequence. A motion analysis system was used to record finger and bow...

Université de Fribourg

Laser speckle imaging with an active noise reduction scheme

Völker, Andreas C. ; Zakharov, Pavel ; Weber, B. ; Buck, F. ; Scheffold, Frank

In: Optic Express, 2005, vol. 13(24), p. 9782

We present an optical scheme to actively suppress statistical noise in Laser Speckle Imaging (LSI). This is achieved by illuminating the object surface through a diffuser. Slow rotation of the diffuser leads to statistically independent surface speckles on time scales that can be selected by the rotation speed. Active suppression of statistical noise is achieved by accumulating data over time. We...

Université de Fribourg

New analysis method for CCD X-ray data

Ishiwatari, T. ; Beer, G. ; Bragadireanu, A.M. ; Cargnelli, M. ; Curceanu (Petrascu), C. ; Egger, J.-P. ; Fuhrmann, H. ; Guaraldo, C. ; Iliescu, M. ; Itahashi, K. ; Iwasaki, M. ; Kienle, P. ; Lauss, B. ; Lucherini, V. ; Ludhova, Livia ; Marton, J. ; Mulhauser, Françoise ; Ponta, T. ; Schaller, Lukas A. ; Sirghi, D. L. ; Sirghi, F. ; Strasser, P. ; Zmeskal, J.

In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2006, vol. 556(2), p. 509-515

The analysis method developed for kaonic nitrogen X-ray data obtained at the DAΦNE electron–positron collider of Frascati National Laboratories using Charge-Coupled Devices (CCDs) in the DEAR experimental setup is described. Background events could be highly rejected by this analysis procedure. Three sequential X-ray lines from kaonic nitrogen transitions, showing good energy resolution, could...