Du Hadramaout aux Comores et retour

In Shihr, a city laying along the Indian Ocean coast, migration is an old time practice. It is known that these Hadrarni communities had a strong impact on the economic, political and social life of their host countries. At the same time, migrants also played a major role in Hadramaout. Through the life story of Abd al-Qādir Ba Moussa, remembered by his grandson Abdalla, we see how his migration entailed a change of social status for his sons when they went back to Hadramout. In Hadrarni society, where very strict social rules prevail, migration can be a way of modifying one's social position.Dans la ville de Shihr, située dans le Hadramaout en bordure de l'océan Indien, la pratique de la migration est ancienne. On sait de longue date que les communautés hadramies ont eu un impact sur la vie économique, politique et sociale de leurs sociétés d'accueil. En parallèle, la communauté de migrants a également joué un rôle majeur dans le Hadramaout. Dans une société où la stratification sociale est énoncée de manière particulièrement rigide, il est montré, à travers le cas de la famille Ba Moussa de Shihr, comment la migration d'un de ses membres peut avoir une incidence sur la position sociale de ses descendants quand ces derniers reviennent dans le Hadramaout.Camelin Sylvaine, Le Guennec-Coppens Françoise, Mery Sophie. Du Hadramaout aux Comores et retour. In: Journal des africanistes, 2002, tome 72, fascicule 2. pp. 123-137

Vers la construction d’un arrière-plan

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Patterns of circulating LH, FSH, prolactin and E2 17 β in the gilt during the follicular phase of the oestrus cycle

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Comparison of propagation-based phase contrast tomography and full-field optical coherence tomography on bone tissue

International audienceThe current huge development of new 3D microscopic techniques (synchrotron microtomography, optical coherence tomography, light sheet microscopy, …) opens a large variety of new perspectives for life sciences. The contrasts of these new microscopies are mostly well understood on samples of known material content such as those used in physics or instrumentation studies. The situation is different when it comes to the interpretation of the contrasts observed with complex heterogeneous media found in biology. Therefore determining which 3D microscopy technique is suited for which biological question is a topic of current interest (see [1,2] for instance in our group).In this communication, we propose a comparison of the contrast observed with full-field optical coherence tomography (OCT) and propagation-based phase contrast tomography (PCT) on bone tissue at similar spatial resolution. A first comparison of OCT with standard absorption microtomography was given in [3] for bones and we extend this comparison to PCT which is known to provide enhanced contrast on bones at multiple scales [4]. The contrast of both these techniques are a priori interesting to be compared since they both rely on discontinuities of refraction index. This produces phase shift in PCT which operates in the X-ray domain with a monochromatic beam (generated by a synchrotron) while this generates direct intensity reflexion with OCT which only resorts to white light in the visible domain

Interannual variations of forest floor vegetation communities in the French RENECOFOR: level 2 network

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Interannual variations of forest floor vegetation communities in the French RENECOFOR: level 2 network

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