Le refus scolaire [School refusal]

Pediatrician are often questioned by school refusal which relies on a wide range of psychopathological features and necessitates specific approaches. This disabling condition remains underestimated and is still increasing. A poor prognosis associated with a prolonged school absence is the common hallmark of school refusals, regardless of its heterogeneity. Its seriousness warrants early identification and prompt intervention by childhood healthcare professionals, teachers and social workers. A specialized treatment is needed, closely linked with families and school. Promising developments come from a functional rather than symptomatic concept of school refusal. They offer tailored interventions which fit the clinical diversity of school refusals. After a brief historical summary and current definitions of school refusal, the authors review the main clinical features and comorbidity before taking up treatment modalities.

A simple blood-culture bacterial pellet preparation for faster accurate direct bacterial identification and antibiotic susceptibility testing with the VITEK 2 system.

An ammonium chloride procedure was used to prepare a bacterial pellet from positive blood cultures, which was used for direct inoculation of VITEK 2 cards. Correct identification reached 99% for Enterobacteriaceae and 74% for staphylococci. For antibiotic susceptibility testing, very major and major errors were 0.1 and 0.3% for Enterobacteriaceae, and 0.7 and 0.1% for staphylococci, respectively. Thus, bacterial pellets prepared with ammonium chloride allow direct inoculation of VITEK cards with excellent accuracy for Enterobacteriaceae and a lower accuracy for staphylococci.

A novel method of dynamic culture surface expansion improves mesenchymal stem cell proliferation and phenotype.

Repeated passaging in conventional cell culture reduces pluripotency and proliferation capacity of human mesenchymal stem cells (MSC). We introduce an innovative cell culture method whereby the culture surface is dynamically enlarged during cell proliferation. This approach maintains constantly high cell density while preventing contact inhibition of growth. A highly elastic culture surface was enlarged in steps of 5% over the course of a 20-day culture period to 800% of the initial surface area. Nine weeks of dynamic expansion culture produced 10-fold more MSC compared with conventional culture, with one-third the number of trypsin passages. After 9 weeks, MSC continued to proliferate under dynamic expansion but ceased to grow in conventional culture. Dynamic expansion culture fully retained the multipotent character of MSC, which could be induced to differentiate into adipogenic, chondrogenic, osteogenic, and myogenic lineages. Development of an undesired fibrogenic myofibroblast phenotype was suppressed. Hence, our novel method can rapidly provide the high number of autologous, multipotent, and nonfibrogenic MSC needed for successful regenerative medicine.

Introduction: L'orientation scolaire et professionnelle en Suisse

L'introduction au numéro thématique de L'OSP sur la Suisse décrit quelques particularités institutionnelles, politiques et socioéconomiques de ce pays, afin de situer les différentes contributions. Elle expose également les logiques retenues pour le choix des contributions.

Comparison of the proliferative activity of neuroblasts from chick embryo cerebral hemispheres of different ages in culture.

Dissociated cerebral hemisphere cells from 4- to 7-day-old chick embryos were cultured either on a collagen or a polylysine substrate in a serum-containing medium. Neurons were characterized by the demonstration of acetylcholinesterase, the presence of D2/N-CAM glycoprotein and neurofilament proteins. The proliferation of neuronal precursor cells was shown by morphological observations, autoradiographic analysis and measurements of [3H]-thymidine incorporation. Neuronal precursors derived from the 6-day-old embryos showed the highest proliferative activity. Neuroblast proliferation was found to be dependent on the culture substrates (i.e. polylysine or collagen), which yielded either isolated cells or cell aggregates, and the latter favored the mitogenic effect.

Sémiotique, culture et développement psychologique

Ce livre propose une perspective novatrice en psychologie qui intègre la culture à titre constitutif dans son approche du développement. Comment les productions humaines contribuent-elles au développement psychologique ? Au sens fort, comment produisent-elles le psychisme ? Et comment, en les étudiant, en saisir les développements originaux chez les sujets dans leurs contextes de production ? Les recherches présentées dans cet ouvrage portent ainsi sur les dimensions matérielles de la culture dans l'avènement et le fonctionnement du psychisme, en intégrant également le langage et d'autres dimensions idéelles de celle-ci. Les textes de cet ouvrage s'inscrivent dans un dialogue interdisciplinaire, replaçant la psychologie dans le cercle des sciences humaines et sociales, requestionnant de facto son épistémologie et ses méthodes.

Which anatomical sites should be sampled for screening of methicillin-resistant Staphylococcus aureus carriage by culture or by rapid PCR test?

The nose is the anatomical site usually recommended for methicillin-resistant Staphylococcus aureus (MRSA) screening. Other sites are also recommended, but are more controversial. We showed that the sensitivities of MRSA detection from nasal swabs alone were 48% and 62% by culture or by rapid PCR test, respectively. These percentages increased to 79% and 92% with the addition of groin swabs, and to 96% and 99% with the addition of groin and throat swabs. In conclusion, neither by culture nor by rapid PCR test is nose sampling alone sufficient for MRSA detection. Additional anatomical sites should include at least the groin and throat.