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We evaluated the Hycel-M Multichannel Analyzer on behalf of the British Department of Health and Social Security. The purpose of the evaluation was to determine the precision of the instrument over a prolonged period of time, to compare its results with those of well-tried laboratory procedures, and to determine how the instrument would perform under the rigors of routine analysis. In addition,...
We consider the action of semigroups e~ tH , with H =-Δ + V on L 2 (R V), on the scale of Sobolev spaces J>f α. We show that while e' tH maps L 2 — Jf° to 3tf 2 under great generality, there exist bounded V so that, for all β > 0, e~ tH [3f β ] is not contained in any 3^ a with a > 2.
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Psychological performance tests have been used since the mid-1960s in occupational and environmental health toxicology. The interpretation of significantly different test scores in neurobehavioural studies is not straightforward in the regulation of chemicals. This paper sets out some issues which emerged from discussions at an international workshop, organised by the United Kingdom Health and ...
DIVERSITAS, the international programme on biodiversity science, is releasing a strategic vision presenting scientific challenges for the next decade of research on biodiversity and ecosystem services: "Biodiversity and Ecosystem Services Science for a Sustainable Planet". This new vision is a response of the biodiversity and ecosystem services scientific community to the accelerating loss of t...
Here, we propose two basic concepts that can streamline electrophysiology and imaging experiments in brain slices and enhance data collection and analysis. The first idea is to interface the experiment with a software environment that provides a 3D scene viewer in which the experimental rig, the brain slice, and the recorded data are represented to scale. Within the 3D scene viewer, the user ca...
Low-dose, high-resolution electron microscopy combined with conventional direct-phasing methods based on the estimates of triplet-structure invariants are used to determine phase values for all observed electron-diffraction-structure factor magnitudes from epitaxially oriented multilamellar paracrystals of the phosphospholipid 1,2-dihexadecyl-sn-glycerophosphoethanolamine. The reverse Fourier t...
ar X iv : 0 80 1 . 39 23 v 1 [ nl in . C D ] 2 5 Ja n 20 08 Global dynamics of coupled standard maps
1 Center for Research and Applications of Nonlinear Systems (CRANS), Department of Mathematics, University of Patras, GR–26500, Greece. [email protected], [email protected] 2 Observatoire Astronomique de Marseille–Provence (OAMP), 2 Place Le Verrier, F–13248 Marseille, Cédex 04, France. 3 Astronomie et Systèmes Dynamiques, IMCCE, Observatoire de Paris, 77 Av. Denfert–Rocherea...
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