Douvrin – Route de Lens

L’opération de diagnostic « route de Lens - rue des Guérous » menée sur 7,4 ha à Douvrin n’a pas permis la mise en évidence d’occupations anciennes sur la zone. L’emprise est située sur des terrains qui ont été exploités par une briqueterie au début du xxe s. et dont la majorité de la couverture limoneuse a disparu. Les vestiges mis au jour sont tous rattachés à la première Guerre Mondiale. En effet, ceux-ci témoignent d’une importante présence militaire allemande dans ce secteur situé au cœu..

Contrôle cationique des propriétés d'émission de luminescence au sein de dyades Pyrène-2, 2'-Bipyridine. Conception, synthèse, études spectroscopiques et théoriques

Au cours de ce travail nous avons conçu et synthétisé une nouvelle famille d'oligomères conjugués photoactifs incorporant le chromophore pyrène et l'unité chélatante 2,2'-bipyridine. Ces deux groupes sont assemblés de façon covalente aux extrémités d'un pont de type oligo(phénylène vinylène) ou oligo(phénylène éthynylène). L'étude photophysique de ces ligands montre combien la complexation d'un ion métallique, par un système p conjugué, représente une approche très flexible pour en moduler les propriétés optiques. Selon la nature du métal utilisé, il est possible de favoriser sélectivement la population d'états excités de nature et de multiplicité différentes. Notamment, la chélation de métaux lourds, comme le ruthénium(II), offre la possibilité d'accéder aux états triplets et d'en exploiter la richesse de propriétés.We report the design and synthesis of newly conjugated ligands based on pyrene as fluorescent group and 2,2'-bipyridine as chelating unit. These two groups are covalently assembled by an oligo(vinylene-phenylene) or oligo(ethynylene-phenylene) group. Photophysical investigation have underlined a dramatic modulation of the optical properties of these ligands upon addition of cations. Indeed, complexation of a metal ion, by a conjugated p system, provides a flexible way to tune the photophysical characteristics of this kind of compounds. Depending on the ion used, it is possible to populate excited states of different kind and spin multiplicity. Particularly, complexation of heavy metals, like ruthenium(II), provides an easy way to access triplet excited states

Development of natural semiochemical slow-release formulations as biological control devices

peer reviewedSemiochemicals – informative molecules used in insect-insect or plant-insect interactions – have been widely considered within various integrated pest management (IPM) strategies. In the present work, two sesquiterpenoids, E-β-farnesene and E-β-caryophyllene, were formulated for their properties as aphid enemy attractants. E-β-farnesene, the alarm pheromone of many aphid species, was also identified as a kairomone by attracting aphid predators and parasitoids. E-β-caryophyllene was identified as a potential component of the aggregation pheromone of the Asian ladybird, Harmonia axyridis Pallas, another aphid predator. The two products were purified from essential oils of Matricaria chamomilla L. (Asteraceae) and Nepeta cataria L. (Lamiaceae), respectively. Natural and biodegradable formulations were then investigated in order to deliver these molecules on crop fields for a long period of time as biological control devices. Due to their sensitivity to oxidation, both sesquiterpenes needed to be protected from oxygen degradation. For this purpose, alginate – hydrophilic matrix with low oxygen permeability – was used as polymer for the formulations: the main objective was to deliver semiochemicals in the air in a controlled way. Consequently, a careful selection of alginates was realised. Formulated beads showed different structural and encapsulation properties depending on various formulation factors. Alginate formulations were characterised by texturometry and by confocal microscopy in order to observe the distribution of semiochemicals in alginate network. The last step of alginate bead characterisation consisted in studying release rate of semiochemicals in laboratory-controlled conditions by optimised volatile collection system and validated fast GC analytical procedures Finally, the efficiency of formulations as aphid predator (Syrphidae species) and parasitoid (Aphidius ervi) attractants was demonstrated by field trapping and olfactometry experiments.SOLAPHI

Smelting in the Shadow of the Iron Mountain: Preliminary Field Investigation of the Industrial Landscape around Phnom Dek, Cambodia (Ninth to Twentieth Centuries A.D.)

The high-grade mineral ores of the Phnom Dek region in central Cambodia have long been suspected of playing a major role in the rise of Angkor, the largest medieval polity in mainland Southeast Asia. This article presents the first comprehensive study by the Industries of Angkor Project (INDAP) to document the extent of industrial activity in this region and test this important relationship. Using a combination of intensive field survey, surface collection, and archaeometallurgical analysis, we evaluate the temporal and spatial patterning of iron production and the heterogeneity of smelting systems. The identification of at least three different smelting traditions has a significant impact on the current view that twentieth-century Kuay smelting practices extend deep into Cambodia’s history, and their relationship with Angkor in particular. More broadly, the survey demonstrates the importance of Phnom Dek as a major production zone on par with more well-known examples in Roman Europe and Africa

Laparoscopic Spleen-Preserving Distal Pancreatectomy Followed by Intramuscular Autologous Islet Transplantation for Traumatic Pancreatic Transection in a Young Adult

Context Pancreatic injuries caused by blunt trauma are often treated conservatively, except for the highest grades of these. Case report We report a case of complete transection of the distal pancreas in a young adult which was successfully managed by spleen-preserving laparoscopic distal pancreatectomy followed by an islet autotransplantation in the patient’s forearm striated muscle. Conclusion We describe a mini-invasive approach for pancreatectomy with restoration of resected islets to the patient