116 research outputs found

    La fertilité des sols tropicaux

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    Hypoxia-activated genes from early placenta are elevated in preeclampsia, but not in Intra-Uterine Growth Retardation.

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    BACKGROUND: As a first step to explore the possible relationships existing between the effects of low oxygen pressure in the first trimester placenta and placental pathologies developing from mid-gestation, two subtracted libraries totaling 2304 cDNA clones were constructed. For achieving this, two reciprocal suppressive/subtractive hybridization procedures (SSH) were applied to early (11 weeks) human placental villi after incubation either in normoxic or in hypoxic conditions. The clones from both libraries (1440 hypoxia-specific and 864 normoxia-specific) were spotted on nylon macroarrays. Complex cDNAs probes prepared from placental villi (either from early pregnancy, after hypoxic or normoxic culture conditions, or near term for controls or pathological placentas) were hybridized to the membranes. RESULTS: Three hundred and fifty nine clones presenting a hybridization signal above the background were sequenced and shown to correspond to 276 different genes. Nine of these genes are mitochondrial, while 267 are nuclear. Specific expression profiles characteristic of preeclampsia (PE) could be identified, as well as profiles specific of Intra-Uterine Growth Retardation (IUGR). Focusing on the chromosomal distribution of the fraction of genes that responded in at least one hybridization experiment, we could observe a highly significant chromosomal clustering of 54 genes into 8 chromosomal regions, four of which containing imprinted genes. Comparative mapping data indicate that these imprinted clusters are maintained in synteny in mice, and apparently in cattle and pigs, suggesting that the maintenance of such syntenies is requested for achieving a normal placental physiology in eutherian mammals. CONCLUSION: We could demonstrate that genes induced in PE were also genes highly expressed under hypoxic conditions (P = 5 x 10(-5)), which was not the case for isolated IUGR. Highly expressed placental genes may be in syntenies conserved interspecifically, suggesting that the maintenance of such clusters is requested for achieving a normal placental physiology in eutherian mammals

    Comparaison de trois techniques d'amplification génique par PCR aux méthodes traditionnelles de diagnostic pour la recherche des virus influenza A

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    CAEN-BU MĂ©decine pharmacie (141182102) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF

    L’architecture carolingienne en France et en Europe

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    International audienc

    Les cryptes de Chartres et leurs matĂ©riaux de construction. État des recherches

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    Nous avions eu l’occasion de faire le point sur les diffĂ©rentes interprĂ©tations archĂ©ologiques inhĂ©rentes au monde Chartrain et en particulier aux cryptes. Aussi, dans le cadre de cette publication, nous souhaitons souligner en contrepoint la question des matĂ©riaux et du bĂąti, qui a pu ĂȘtre dĂ©terminante pour leur mise en Ɠuvre dans les choix des constructeurs. L’espace analysĂ© ici est celui de la crypte – ou caveau Saint-Lubin – et de la partie orientale du premier chevet « roman », mise au j..

    L'Ɠuvre de Fulbert, XIe siùcle

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    L’abbatiale carolingienne de Saint-Philbert-de-Grandlieu. La sculpture architecturale

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    Die karolingische Abteikirche Saint-Philibert-de-Grandlieu. Bauplastik Die Bauplastik der Abteikirche ist Ă€ußerst spĂ€rlich. Aus der ersten karolingischen Bauphase stammt nur eine gefaste KĂ€mpferplatte und aus der zweiten einige wenige KĂ€mpferplatten der Ă€ußeren Krypta, die im Apsis Bereich und im kreuzförmigen Oratorium eine gewisse Einheitlichkeit der Profile aufweisen, dies bei Platten und Rinnleisten. Die drei anderen wenig hervortretenden KĂ€mpferplatten sind von minderer QualitĂ€t und weisen unterschiedliche Profile auf. Die interessantesten Elemente stehen in Zusammenhang mit einer Erneuerung der Seitenbögen der Vierung aus dem 12. Jh. : Es sind eine Klauenbasis und ein geometrisches Kapitell in romanischem Stil und insbesondere ein Spolienkapitell aus weißem Marmor, das, wie auch zwei weitere, Ă€hnlich gestaltete und im Bauschutt entdeckte Kapitelle als aus spĂ€tantiker Produktion im PyrenĂ€enraum identifiziert wurden ; zweifellos wurden sie den antiken Ruinen der Region entnommen.The Carolingian abbatial church of Saint-Philbert-de-Grandlieu. The architectural sculpture The architectural sculpture of the abbey church is extremely modest. From the first phase only a beveled impost remains, and from the second only a few imposts in the exterior crypt. These present a certain unity of style in the perimeter of the apse and cruciform oratory : tablet and cyma molding. The three other imposts, barely projecting and of mediocre workmanship, have more varied moldings. The most interesting elements are associated with a reworking of the lateral arches at the twelfth-century crossing of the transept ; these include a “ base Ă  griffes” and a Romanesque geometric capital, and a reused white marble capital. This last and two others of the same type discovered in the rubble fill are late Antique works from the Pyrenees, undoubtedly recuperated from antique ruins in the region.La sculpture architecturale de l’abbatiale est particuliĂšrement pauvre. De la premiĂšre phase carolingienne, ne subsiste qu’une imposte chanfreinĂ©e, et, de la seconde, les quelques impostes de la crypte hors-oeuvre. Celles-ci prĂ©sentent une certaine unitĂ© de modĂ©nature au pourtour de l’abside et dans l’oratoire cruciforme : tablette et doucine ; les trois autres impostes, peu saillantes et de facture mĂ©diocre, ont une mouluration plus diversifiĂ©e. Les Ă©lĂ©ments les plus intĂ©ressants sont associĂ©s Ă  une reprise des arcs latĂ©raux de la croisĂ©e du transept au XIIe siĂšcle : une base Ă  griffes et un chapiteau gĂ©omĂ©trique romans, et surtout un chapiteau de marbre blanc en rĂ©emploi. Celui-ci, ainsi que deux autres de mĂȘme nature dĂ©couverts dans des remblais, ont Ă©tĂ© reconnus comme des productions pyrĂ©nĂ©ennes de l’AntiquitĂ© tardive ; sans doute ont-ils Ă©tĂ© prĂ©levĂ©s dans des ruines antiques de la rĂ©gion.HĂ©ber-Suffrin François, Sapin Christian. L’abbatiale carolingienne de Saint-Philbert-de-Grandlieu. La sculpture architecturale. In: Bulletin Monumental, tome 173, n°2, annĂ©e 2015. pp. 145-150

    Structural map of the South China sea

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