Recherche-action et gouvernance clinique: l'exemple du projet "psychiatrie et migrants" du CHUV [Action research and clinical governance: the example of the project "psychiatry and migrants" at the Centre hospitalier universitaire vaudois]

Action research is a useful instrument for the organization health care and the clinical governance of psychiatric institutions. What this type of research offers can be illustrated by the cohort study of migrant patients without health insurance who consulted the Department of Psychiatry of the Vaudois university medical center (CHUV) in 2008. While giving greater visibilty to the psychological suffering and social distress of these patients, the study also enabled the authors to determine which clinical procedures were actually offered to these patients and the amount these procedures cost the department. The small number of cases that were identified as well as their uneven distribution amongst the different services of the department suggest that considerable efforts must still be made to improve access for this population to public psychiatric services.

Simulations of action of DNA topoisomerases to investigate boundaries and shapes of spaces of knots.

The configuration space available to randomly cyclized polymers is divided into subspaces accessible to individual knot types. A phantom chain utilized in numerical simulations of polymers can explore all subspaces, whereas a real closed chain forming a figure-of-eight knot, for example, is confined to a subspace corresponding to this knot type only. One can conceptually compare the assembly of configuration spaces of various knot types to a complex foam where individual cells delimit the configuration space available to a given knot type. Neighboring cells in the foam harbor knots that can be converted into each other by just one intersegmental passage. Such a segment-segment passage occurring at the level of knotted configurations corresponds to a passage through the interface between neighboring cells in the foamy knot space. Using a DNA topoisomerase-inspired simulation approach we characterize here the effective interface area between neighboring knot spaces as well as the surface-to-volume ratio of individual knot spaces. These results provide a reference system required for better understanding mechanisms of action of various DNA topoisomerases.

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