72 research outputs found
L’énigme incarnée: Méliot de Logres dans le Haut Livre du Gral
The High Book of the Grail, also known as Perlesvaus, after its main character, an analogon of Perceval who evolves in a universe of blood and violence, is a French Arthurian prose romance of the 13th century. The principle of imperfection on which this romance is set encompasses its narrative composition, the consistency of its allegorical meaning, and the poetics of character. Meliot de Logres can be called an énigme incarnée, as its representation does not tend towards unity, but towards destruction. He is an enigma because of its numerous narrative functions (alter Christus, a man in distress, knight ...), and its symbolical power (he is ‘de Logres’, which suggests a moral signification, he embodies spiritual greatness that the romance does not develop). The semiological analysis of this secondary but important character is a way to understand the many problems aroused by the scripture of the High Book of the Grail. Meliot is not only a double: through him, we can see the complexity and intricacy of the romance as a whole
Global Spatial Risk Assessment of Sharks Under the Footprint of Fisheries
Effective ocean management and conservation of highly migratory species depends on resolving overlap between animal movements and distributions and fishing effort. Yet, this information is lacking at a global scale. Here we show, using a big-data approach combining satellite-tracked movements of pelagic sharks and global fishing fleets, that 24% of the mean monthly space used by sharks falls under the footprint of pelagic longline fisheries. Space use hotspots of commercially valuable sharks and of internationally protected species had the highest overlap with longlines (up to 76% and 64%, respectively) and were also associated with significant increases in fishing effort. We conclude that pelagic sharks have limited spatial refuge from current levels of high-seas fishing effort. Results demonstrate an urgent need for conservation and management measures at high-seas shark hotspots and highlight the potential of simultaneous satellite surveillance of megafauna and fishers as a tool for near-real time, dynamic management
Consumption of Post-Larval Swordfish (Xiphias gladius) by Dolphinfish (Coryphaena hippurus): New Ecological Insights into both Species in the Tyrrhenian Sea
Knowledge of post-larval swordfish (Xiphias gladius) ecology in the world’s oceans is incomplete as they are rarely found in ichthyoplankton samplings or commercial catches and individuals are difficult to observe in the marine ecosystem. Analyses of stomach contents of apex predators can provide otherwise unobtainable ecological insights. Two well-preserved bills of post-larval swordfish were identified among the partially digested stomach contents of an adult male dolphinfish (Coryphaena hippurus) caught in the northern Tyrrhenian Sea. The lower jaw to fork lengths of the two predated swordfish were estimated at respectively, 18 and 22 cm, corresponding to 81- and 99-day-old swordfish hatched in the 2022 spawning season. This analysis and recent information on the reproductive dynamics of swordfish in the same area reported in the literature shed light not only on the early stages of swordfish growth but also on dolphinfish ecology in the Tyrrhenian Sea. The two species share the same habitat and are both caught with commercial pelagic surface longlines. Environmental shifts associated with climate change could unpredictably modify the reproduction dynamics, growth, recruitment and distribution of both species. This knowledge is important for the sustainable management of regional fisheries
南西インド洋におけるカジキ延縄漁業の開発と持続可能性に関する研究--1994年~2008年のReunion Island(France)周辺海域を事例に
学位の種類:農学 学位授与年月日:平成22年3月23日 主査: 山根, 猛 教授 報告番号:乙第575号 学内授与番号:農第143号 NDL書誌ID:00001105781
ETUDE DE LA REACTIVITE D'ALLENYLZINC ET APPLICATION EN SYNTHESE
DANS CE TRAVAIL, LA REACTIVITE D'ALLENYLZINCIQUES DANS DES REACTIONS DIASTEREOSELECTIVES A ETE ETUDIEE. IL A ETE DEMONTRE D'UNE PART, QU'UN AUXILIAIRE CHIRAL PORTE PAR L'ATOME DE ZINC INFLUENCE LE CARACTERE ACIDE DE LEWIS DU METAL. D'AUTRE PART LES AUXILIAIRES UTILISES N'ONT PERMIS D'OBTENIR UN ALLENYLZINCIQUE QUE FAIBLEMENT ENANTIOMERIQUEMENT ENRICHI. CES FAIBLES EXCES ENANTIOMERIQUES ONT PU ETRE EXPLIQUES PAR LA STABILITE CONFIGURATIONNELLE DE CET ORGANOZINCIQUE QUI A ETE DEMONTRE EN REALISANT LE TEST D'HOFFMANN. POUR CE FAIRE, UNE ETUDE DE LA DIASTEREOSELECTIVITE DE L'ADDITION DE CET ORGANOZINCIQUE SUR DES ELECTROPHILES CHIRAUX A PERMIS DE MONTRER QUE L'ADDITION DE L'ALLENYLZINCIQUE SUR UN ALDEHYDE -CHIRAL EST FAIBLEMENT DIASTEREOSELECTIVE ALORS QUE LA DIASTEREOSELECTIVITE EST EXCELLENTE PAR ADDITION DE L'ALLENYLZINCIQUE SUR LES IMINES CORRESPONDANTES. CETTE EXCELLENTE DIASTEREOSELECTIVITE A PERMIS DE REALISER LE DEDOUBLEMENT CINETIQUE DE L'ALLENYLZINC, CONDUISANT A LA FORMATION IN SITU D'UN ALLENYLZINCIQUE AVEC DE TRES BONS EXCES ENANTIOMERIQUES. DE PLUS, CETTE REACTION A ETE MISE EN VALEUR PAR LA SYNTHESE D'AMINOALCOOLS ET DE SYNTHONS HAUTEMENT FONCTIONNALISES, OPTIQUEMENT PURS, PRECURSEURS DE PRODUITS NATURELS. DE FACON INDEPENDANTE, UNE ETUDE SUCCINCTE SUR L'ALLYLMETALLATION D'OLEFINE METALLEE A PERMIS DE MONTRER LA POSSIBILITE D'EN REALISER UNE VERSION ENANTIOSELECTIVE.PARIS-BIUSJ-Thèses (751052125) / SudocCentre Technique Livre Ens. Sup. (774682301) / SudocPARIS-BIUSJ-Physique recherche (751052113) / SudocSudocFranceF
Parenting
International audienceMany parents wonder about the right way to raise their child. It is sometimes difficult for them to know what to do, who to listen to, or to understand why they can't do it...In this book, Raphaële Miljkovitch and François Poisson propose an innovative approach that consists in analyzing the multiple factors that prevent parents from feeling competent and legitimate in their educational role.Using concrete cases, they decipher the mechanisms at work in families, in order to enable all parents to take back the reins and to flourish in their relationship with their child
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