References of "Bertrand, S"
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See detailIdentification and typing of Salmonella serotypes isolated from guinea fowl (Numida meleagris) farms in Benin during four laying seasons (2007-2010)
Boko, C; Kpodekon, T; Duprez, Jean-Noël ULg et al

in Avian Pathology : Journal of the W.V.P.A (2013), 42

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See detailLate Holocene environmental changes recorded in the sediments of Lago Thompson, Northern Chilean Patagonia
Fagel, Nathalie ULg; Nuttin, L.; Bertrand, S. et al

Poster (2010)

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See detailThe 900-yr sedimentary record of Lago Thompson, Northern Chilean Patagonia
Fagel, Nathalie ULg; Nuttin, L.; Bertrand, S. et al

Poster (2010)

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See detailHolocene environmental changes in lake sediments from Northern Chilean Patagonia (45-48°S)
Nuttin, L.; Fagel, Nathalie ULg; Bertrand, S. et al

Poster (2009)

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See detailChemical profiles in lake sediments in Laguna Chica de San Pedro (Bio-Bio Region, Chile)
Chirinos, L. R.; Urrutia, R.; Fagel, Nathalie ULg et al

in Journal of the Chilean Chemical Society [=JCCS] (2005), 50(4), 697-710

Metal profiles in lake sediments could provide historical environmental information on impacts caused by human activities and natural events, with view to the formulation of effective environmental ... [more ▼]

Metal profiles in lake sediments could provide historical environmental information on impacts caused by human activities and natural events, with view to the formulation of effective environmental policies. This paper presents data on sedimentary element profiles in Laguna Chica de San Pedro (LCSP) lake, located in the Bio Bio Region in Southern Chile, where important industrial activities are concentrated. Sediment properties (organic and inorganic matter, grain size, particle distribution, biogenic silica, Mn/ Fe ratio), major (Al, Ca, K, Mg, Ti, Na), trace (V, As, Co, Cu, Zn, Ni, Cr, Pb, Sr), and mobile (Fe, Mn, P, S) elements, as well as mineral profiles (plagioclase, quartz, clays, amorphous material) are presented, up to 65 cm depth. In general, relatively constant concentration profiles are observed in the sedimentary core middle section, for most elements. Most changes in composition are seen at the top (recent industrial period) and bottom (before human intervention) sections. Variable redox conditions, generated by biological activity at the sediment-water interface are likely to account for composition profiles at the sediment-water interface. On the other hand, physical processes seem to be mostly responsible for concentration changes in Pre-industrial sediments. Mineral content profiles, such as plagioclase, clay and quartz, as well as total clay content remain fairly constant in most of the core, showing significant changes at its bottom part. High excess V, As, and S values, especially at the upper sediment, arise as a consequence of redox conditions in the lake. Certainly, such metal enrichment is mainly associated with natural sedimentary matter supply from the watershed. [less ▲]

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See detailSalmonella dans la viande et dans les oeufs : un danger pour le consommateur qui demande la mise en place d’un programme de lutte efficace
Van Immerseel, F.; De Buck, J.; Boyen, F. et al

in Annales de Médecine Vétérinaire (2005), 149(1), 34-48

L’émergence de Salmonella Enteritidis dans l’industrie avicole a eu lieu dans tous les pays occidentaux entre 1965 et 1980. Depuis lors, ce sérotype est devenu le plus commun chez la volaille. Comme il se ... [more ▼]

L’émergence de Salmonella Enteritidis dans l’industrie avicole a eu lieu dans tous les pays occidentaux entre 1965 et 1980. Depuis lors, ce sérotype est devenu le plus commun chez la volaille. Comme il se transmet verticalement dans les oeufs, il constitue la cause principale de la pandémie de salmonellose non-typhoïde qui est observée chez l’homme. En outre, la bactérie se transmet aussi horizontalement dans les exploitations de volaille. Une fois qu’un bâtiment a hébergé des poules contaminées, il est très difficile d’éliminer cette contamination par les mesures hygiéniques classiques. Le mécanisme de transmission dans les oeufs n’est toujours pas complètement élucidé, ce qui constitue un obstacle majeur pour le développement de nouvelles mesures de prévention et de traitement. Les produits et mesures actuellement disponibles pour lutter contre Salmonella chez la volaille ont été largement développés sur base de méthodes empiriques. Néanmoins, la situation actuelle impose de prendre des mesures. Au niveau européen, de nouvelles dispositions législatives prévoient une série de mesures visant à réduire les taux de contamination de Salmonella tout au long de la chaîne de production, de transformation et de distribution des oeufs et de la viande de volaille. Il est évident que les contaminations des oeufs et de la viande sont fortement influencées respectivement par les conditions hygiéniques de l’abattage et par la réfrigération des oeufs. Au niveau belge, l’Agence fédérale pour la Sécurité de la chaîne alimentaire (AFSCA) va mettre en place un nouveau programme de lutte dans le secteur avicole. Cet article passe en revue les aspects les plus importants de l’épidémiologie, de la pathogenèse et décrit les mesures de prévention et de lutte qui sont disponibles à l’heure actuelle. [less ▲]

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See detailSalmonella in pluimveevlees en eieren: een gevaar voor de consument die om efficiënte bestrijdingsprogramma's vraagt
Van Immerseel, F.; De Buck, J.; Boyen, F. et al

in Vlaams Diergeneeskundig Tijdschrift (2005), 74

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See detailTemporal evolution of sediment supply in Lago Puyehue (Southern Chile) during the last 600 yr and its climatic significance
Bertrand, S.; Boes, X.; Castiaux, J. et al

in Quaternary Research (2005), 64(2), 163-175

Short-term climate changes in Southern Chile are investigated by a multi-proxy analysis of a 53-cm-long sedimentary sequence selected among eight short cores retrieved in Lago Puyehue (Chile, 40 degrees S ... [more ▼]

Short-term climate changes in Southern Chile are investigated by a multi-proxy analysis of a 53-cm-long sedimentary sequence selected among eight short cores retrieved in Lago Puyehue (Chile, 40 degrees S). This core contains a 600-yr-long undisturbed record of paleo-precipitation changes. Two measurement methods for sediment density, organic matter and biogenic silica contents are compared and the most appropriate techniques are selected. Together with aluminium and titanium concentrations, grain size and geochemical properties of the organic matter, these proxies are used to demonstrate paleo-precipitation changes around 40 degrees S. Increase of terrigenous particle supply between A.D. 1490 and A.D. 1700 suggests a humid period. Contemporaneously, delta C-13 data show increasing lake productivity, in response to the high nutrient supply. The A.D. 1700-1900 interval is characterized by a decreasing terrigenous supply and increasing delta C-13 values, interpreted as a drying period. The magnetic susceptibility signal, reflecting the terrigenous/biogenic ratio, demonstrates that similar variations occur in all the undisturbed sedimentary environments of Lago Puyehue. The A.D. 1490-1700 wet period is associated with the onset of the European Little Ice Age (LIA) and interpreted as its local signature. This work supports the fact that the LIA was a global event, not only restricted to the Northern Hemisphere. (c) 2005 University of Washington. All rights reserved. [less ▲]

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