Les déficits neuropsychologiques consécutifs à l’alcoolo-dépendance affectent principalement la mémoire épisodique, la mémoire de travail et les capacités visuospatiales, ainsi que les fonctions exécutives et motrices [1,2]. Ces déficits présents notamment en début de sevrage peuvent conduire à un bénéfice limité des ateliers psychothérapeutiques et entraver le maintien de l’abstinence des patients alcoolo-dépendants [3,4]. Ainsi, une évaluation neuropsychologique étendue conduite après sevrage semble essentielle afin d’orienter la prise en charge clinique de ces patients. Cependant, peu de services d’addictologie ont les ressources humaines et financières pour conduire une telle évaluation chez chaque patient. L’objectif de cette étude était donc d’examiner la validité et les qualités psychométriques d’un outil de dépistage : le BEARNI (pour Brief Examination of Alcohol-Related Neuropsychological Impairments). Cet outil a été spécialement développé pour être accessible au personnel soignant non psychologue dans l’objectif de conduire un dépistage rapide des déficits neuropsychologiques consécutifs à l’alcoolo-dépendance. Une batterie neuropsychologique étendue a servi de référence (gold standard) pour déterminer le profil cognitif des patients alcoolo-dépendants et examiner les qualités psychométriques du BEARNI. L’analyse factorielle exploratoire a permis de valider la structure interne de BEARNI en mettant en évidence 5 facteurs expliquant 60 % de la variabilité et reflétant les capacités visuospatiales, les fonctions exécutives, la mémoire verbale et la mémoire de travail verbale. La standardisation de chacun des sub-tests et des scores totaux à BEARNI, conduite par l’intermédiaire de courbes ROC, a mis en évidence que cet outil de dépistage présente une bonne efficacité diagnostique dans le dépistage des atteintes cognitives et motrices présentes chez les patients alcoolo-dépendants après sevrage. Cette étude montre la pertinence de l’utilisation de BEARNI en pratique clinique pour détecter la présence de troubles neuropsychologiques chez les patients alcoolo-dépendants et permettre d’orienter ceux ayant besoin d’une évaluation neuropsychologique étendue.

This paper discusses results from the second phase of the European Ice Sheet Modelling Initiative (EISMINT). It reports the intercomparison of ten operational ice-sheet models and uses a series of experiments to examine the implications of thermomechanical coupling for model behaviour. A schematic, circular ice sheet is used in the work which investigates both steady states and the response to stepped changes in climate. The major finding is that the radial symmetry implied in the experimental design can, under certain circumstances, break down with the formation of distinct, regularly spaced spokes of cold ice which extended from the interior of the ice sheet outward to the surrounding zone of basal melt. These features also manifest themselves in the thickness and velocity distributions predicted by the models. They appear to be a common feature to all of the models which took part in the intercomparison, and may stem from interactions between ice temperature, flow and surface form. The exact nature of these features varies between models, and their existence appears to be controlled by the overall thermal regime of the ice sheet. A second result is that there is considerable agreement between the models in their predictions of global-scale response to imposed climate change.

A standard numerical experiment featuring the Ross Ice Shelf, Antarctica, is presented as a test package for the development and intercomparison of ice-shelf models. The emphasis of this package is solution of stress-equilibrium equations for an ice-shelf velocity consistent with present observations. As a demonstration, we compare five independently developed ice-shelf models based on finite-difference and finite-element methods. Our results suggest that there is little difference between finite-element and finite-difference methods in capturing the basic, large-scale flow features of the ice shelf. We additionally show that the fit between model and observed velocity depends strongly on the ice-shelf temperature field, for which there is presently little observational control. The main differences between model results are due to the equations being solved, the boundary conditions at the ice from and the discretization method (finite element vs finite difference).

For the first time high-quality coverage of the ERS-1 radar altimeter provides a very accurate surface topographic map covering 80% of the Antarctic ice sheet that can contribute significantly to glaciological studies such as ice-sheet flow modelling. The topography allows estimation of the ice-flow direction, the balance velocity and the basal shear stress. A relationship between shear stress, basal temperature and a parameter related to strain rate helps in mapping the behaviour anomalies of these parameters. Longitudinal stress, sliding, bedrock topography and variation in the pre-exponential factor of the flow law are found to play a major role in the ice-flow pattern. This relation can also be used to estimate rheological parameters: the Glen exponent n is found to be 1 for T < −10°C and 3–4 for higher temperatures, where Q is found to be 70 kJ mol−1.

Antarctic krill, Euphausia superba, normally live in social aggregations (schools) but rarely aggregate in laboratory tanks. In order to study the effect of stress on solitary living we tethered krill to wooden skewers and measured heart rate both when they were held isolated from conspecifics and when they were held at normal schooling distances (∼1 body length). Heart rate did not differ significantly with sex or body size. However, intermoult krill had a significantly lower heart rate than postmoult animals. When two individuals were held at schooling distance, with one slightly higher in the water column than the other, the heart rate of the higher individual slowed significantly (106–98 beats min−1), while that of the lower individual remained the same. We interpret these results to mean that krill living solitarily are stressed but will respond to neighbouring individuals by decreasing their metabolic rate and saving energy.

The prevalence of, and clinical risk factors associated with, vancomycin-resistant enterococcal colonization were investigated in patients suspected of having Clostridium difficile infection. Stools submitted for C difficile cytotoxin testing were screened for vancomycin-resistant enterococci (VRE). Isolates were speciated and characterized further by antibiotic susceptibility testing, DNA fingerprinting, and DNA:DNA hybridization for detection of specific vancomycin resistance genes. Of the 79 evaluable patients identified during a 3-month period, 16.5% were VRE-positive. The VRE isolates were genetically heterogeneous, although all carried the vanA gene. DNA fingerprinting data suggest that patient-to-patient transmission occurred, implicating colonized patients as potential reser voirs for VRE transmission. A positive C difficile cytotoxin assay and diabetes mellitus were the only identifiable risk factors associated with VRE colonization. Patients at risk for C difficile infection therefore may serve as reser voirs for VRE.

Controlling the size and distribution of silicon precipitates in aluminum alloy depositions is important for yield enhancement and reliability of small geometry metal interconnects. A non-contact and non-destructive thermal wave imaging technique is used to detect and evaluate size and density of silicon precipitates in AISi and AlSiCu alloys. The thermal wave results are corroborated with SEM and Auger data.