Olympic Experiences: The Significance of Place

Many studies analyse how events affect places, but few examine how places affect events. Existing research suggests that the physical qualities of a venue affect event experiences, but these studies often ignore more subtle dimensions of place such as symbolism, affect and identity. By narrowly focusing on venues, existing research also tends to neglect the fact that event places are perceived at a wider scale too (e.g. the host destination). Whether these wider place factors affect event experiences is the main question addressed by this study. The research involved a quantitative study of spectators who attended the London 2012 Olympic Games. The authors developed and tested a complex model that hypothesized the effects of place on satisfaction using partial least squares structural equation modelling (PLS-SEM). After permissions were gained from the International Olympic Committee and the London Organizing Committee for the Olympic Games, data were collected from over 600 people attending Olympic events. Research was undertaken at three different types of venue: the Aquatics Centre (a purpose built venue), Greenwich Park (a temporary venue) and Wimbledon (an established venue). The findings showed that both venue attachment and place defined at the wider scale (at the destination level) had significant positive effects on event satisfaction. In addition, we found evidence that the different types of venues - purpose built, temporary and established - moderated the relationship between venue attachment and event satisfaction. The results support venue attachment as a second-order factor and demonstrate the role of place symbolism within a four dimensional conceptualization of place attachment. Ultimately, the research suggests that where an event is staged does affect event satisfaction, and this has important implications for the ways the Olympic Games and other large-scale events are staged

Revisiting the host city: an empirical examination of sport involvement, place attachment, event satisfaction and spectator intentions at the London Olympics

This paper tests a model based on hypothesized relationships among sport involvement, place evaluations; at the level of venue and host city, and event satisfaction as antecedents of behavioral intentions. The relationships are explored among a sample of people attending the 2012 London Olympic Games (n = 603). Spectators completed questionnaires at event venues, providing responses at the place and time of the consumptive experience. Confirmatory factor analysis was employed to determine the dimensions of the constructs and to test the validity of measurement items. The structural model indicated that sport involvement and place attachment influenced revisit intentions but this was not the case for event satisfaction. This suggests that although tourism will benefit when spectators experience a psychological connection with event venues, the Olympic Games offer a distinctive event experience that does not have a direct influence on intentions to revisit the host city

Implication de l'endosome de recyclage dans la migration cellulaire in vivo

Au cours de l’ovogenèse chez la mouche du vinaigre: Drosophila melanogaster, un groupe de cellules folliculaires appelées cellules de bord, migrent à travers les cellules nourricières pour atteindre l’ovocyte. Cet événement, nécessitant la transition épithélio- mésenchymateuse (TEM), la réorientation, puis l’arrêt, ressemble à la formation de métastases. L’endocytose est un régulateur clé de plusieurs événements polarisés, y compris la migration cellulaire. En effet, différentes protéines impliquées dans la migration, comme les intégrines et les E-cadhérines (cadhérines épithéliales), sont régulées par transport à travers les endosomes. De même, l’endocytose restreint au front de migration l’activité des récepteurs tyrosine kinases (RTKs) qui guident les cellules de bord dans leur mouvement. Cependant les mécanismes moléculaires de cette restriction spatiale de l’activité des RTKs demeurent largement inconnus. Nous avons testé l’implication du trafic vésiculaire à travers la machinerie d’endocytose, dans la migration dirigée des cellules de bord, car ce système est facilement accessible pour l’expression de protéines et l’analyse de mutants. Nous avons commencé par confirmer une observation précédente du rôle de l’endosome précoce dans la migration des cellules de bord. Ensuite, nous avons identifié l’endosome de recyclage (ER) comme un régulateur clé de cette migration. En effet, nous avons démontré que l’expression dans les cellules de bord d’une forme dominante négative de Rab11, la petite GTPase régulant le transport vésiculaire à travers l’ER, bloque la migration ou entraîne de sévères défauts de migration dans environ 80% des chambres d’œufs examinées. De plus, nous observons par immunofluorescence une relocalisation de l’activité des RTKs alors que d’autres protéines de migration ne sont pas affectées par Rab11 dominant négatif. Ce résultat a été par la suite confirmé par une interaction génétique entre Rab11 et les RTKs. D’autre part, nous avons montré que le complexe exocyste, un effecteur de Rab11, est impliqué dans la migration des cellules de bord. Nous avons trouvé par microscopie confocale en tissu fixé et par microscopie en temps réel que Sec15, un composant de ce complexe, est polarisé, de façon Rab11- dépendante, dans des vésicules qui s’accumulent au front de migration tout au long du mouvement des cellules de bord. De plus, la perte de l’activité de Sec15 perturbe à son tour la migration. Ainsi, toutes ces données démontrent le rôle fondamental d’un cycle d’endo- exocytose dans le maintien des RTKs actifs au niveau du front de migration des cellules de bord le long de leur mouvement.During Drosophila melanogaster’s oogenesis, a cluster of folllicle cells, called border cells, perform an invasive migration through the surrounding nurse cells to reach the oocyte. This event resembles metastasis formation since it requires epithelial- mesenchymal transition, reorientation and arrest. Endocytosis plays a fundamental role in many polarized processes, including cell migration, since different migration proteins, like integrins and E-cadherins traffic through the endocytic pathway. Furthermore, receptor tyrosine kinases (RTKs) that guide border cells during their migration are regulated by endocytosis, although the mechanisms involved are largely unknown. We tested the implication of vesicular trafficking through the endocytic machinery, in border cells’ directed migration, because this system is easily accessible for protein expression and mutant analysis. We first confirmed previous observation that trafficking through the early endosome is necessary for border cells migration, and then we identified the recycling endosome as a key compartment for this migration. Indeed, we showed that overexpression in border cells of a dominant negative form of Rab11, the small GTPase regulating vesicular trafficking through the recycling endosome, blocks migration or leads to severe migration defects in about 80% of examined egg chambers. Furthermore, using immunofluorescence, we observed a relocalization of RTKs activity, whereas other migration proteins were not redistributed upon dominant negative Rab11 expression. This result was further confirmed by a genetic interaction between Rab11 and RTKs. Moreover, we showed that the exocyst complex, an effector of Rab11, is also involved in border cells migration. We found by using confocal microscopy of fixed tissues and time-lapse microscopy of living egg chambers, that Sec15, a member of this complex, is distributed in vesicles which are polarized, in a Rab11- dependent manner, throughout border cells migration. In addition, loss of Sec15 also impairs migration. Together these data demonstrate a fundamental role for an endo- exocytic cycle in the maintenance of active RTKs at the leading edge of border cells during their migration

An empirical examination of the antecedents of residents\u27 support for of future film tourism development

This study aimed to develop and test a conceptual model of the antecedents of residents\u27 attitudinal behavior to support future film tourism in a popular tourism destination. These antecedents include: socio-cultural impacts of existing tourism, place attachment, external perceived realism of media programs, and perceived importance of residents\u27 involvement. A total of 416 survey questionnaires were completed from residents living in the province of Seville, Spain. Partial least squares-structural equation modelling (PLS-SEM) was used to examine the relationship between these factors and the residents\u27 support for future film tourism (RSFFT). The results indicate that place attachment and perceived importance of residents\u27 involvement are the most significant predictors. Also, it confirms that the importance of residents\u27 external perceived realism of movies and TV series shot in their locale is a key predictor of the RSFFT

Endoscopic repair of anterior or middle skull base cerebrospinal fluid leaks after tumour resection

SummaryObjectivesThis study analysed the factors influencing the risk of recurrence following endoscopic repair of CSF leaks of the anterior and middle skull base after endonasal skull base tumour resection.Patients and methodsA retrospective review was conducted on 17 patients operated between May 2007 and December 2010 by endonasal endoscopic resection of anterior or middle skull base tumour who presented an intraoperative CSF leak. Epidemiological data (body mass index [BMI], age, gender) and type of leak (site, size) were studied.ResultsCSF leaks involved the roof of the ethmoid sinus (one patient), cribriform plate (three), posterolateral wall of the sphenoid sinus (six) or the sella turcica (seven). The CSF leak recurrence rate after the first endoscopic procedure was 29.4% (5/17). Failures were not influenced by gender, age, BMI or size of the leak. All recurrences involved the sella turcica or the lateral wall of the sphenoid sinus. The success rate after a second endoscopic procedure was 88.2%.ConclusionEndonasal endoscopic repair of anterior and middle skull base meningeal injuries after tumour resection is a minimally invasive and effective technique. The main challenge of this method consists of ensuring effective control of the postoperative defect after tumour resection in the sphenoidal region, as this region was the only potential risk factor for recurrence identified in this study

Étude de la régulation de l'activité du ligand Delta dans le cadre de la signalisation Notch

La voie de signalisation Notch est conservée au cours de l'évolution. Elle joue un rôle clé dans le développement, et elle est impliquée dans de nombreuses décisions de destin cellulaire, dans le maintien des cellules souches, et dans le contrôle de la prolifération et de la différenciation cellulaires. Une dérégulation de la signalisation Notch est impliquée dans diverses maladies et cancers, y compris les tumeurs solides, comme les cancers du sein et du col de l'utérus, et les leucémies, comme la Leucémie Aiguë Lymphoblastique des cellules T (LAL-T). Notch est un récepteur transmembranaire activé par des ligands transmembranaires de la famille DSL (Delta/Serrate/Lag-2). Bien que plusieurs mutations oncogéniques ont été identifiées au niveau du récepteur Notch, de nombreux cancers modulés par Notch demeurent ligand-dépendants. Étonnamment, les mécanismes moléculaires régulant l'activation du ligand sont encore relativement peu caractérisés par rapport à ceux qui régissent le récepteur Notch lui-même. Utilisant un essai de co-culture avec un rapporteur luciférase de Notch, nous avons effectué le premier crible d'ARNi pan-génomique visant spécifiquement à identifier des régulateurs des ligands de Notch dans la cellule émettrice du signal. Nous avons ainsi pu découvrir de nouvelles classes de régulateurs communs pour les ligands Delta-like1 et 4. Ces régulateurs comprennent des inhibiteurs de protéases, des facteurs de transcription, et des gènes divers à fonction inconnue, tels que Tmem128 « Transmembrane protein 128 », ou à fonction préalablement caractérisée tels que la co-chaperonne moléculaire Cdc37 « Cell division cycle 37 homolog ». Par la suite, nous avons développé des cribles secondaires fonctionnels où nous avons démontré l'importance de ces régulateurs pour des événements Notch-dépendants, comme la différenciation des cellules T normales, et la survie des cellules souches pré-leucémiques isolées à partir d'un modèle murin de LAL-T. En outre, nous avons prouvé que les régulateurs les plus forts du crible de survie sont également nécessaires pour l'activité d'auto-renouvellement des cellules souches pré-leucémiques. Finalement, nous avons entamé une caractérisation moléculaire préliminaire de deux régulateurs nouvellement identifiés; Tmem128 et Cdc37 afin d'étudier leur mécanisme d'action sur les ligands. En conclusion, cette étude nous a permis d'identifier de nouveaux régulateurs de la voie Notch qui pourraient servir de cibles thérapeutiques potentielles dans les cancers; tel qu'illustré par le modèle LAL-T. La compréhension des détails moléculaires sous-jacents aux fonctions de ces régulateurs sera essentielle afin de développer des inhibiteurs pharmacologiques pour bloquer leur action et entraver la signalisation Notch dans le cancer.The Notch signalling pathway is evolutionarily conserved. It plays a key role in development and it is involved in multiple cell fate decisions, in the maintenance of stem cells, and in the regulation of cell proliferation and differentiation. Misregulation of Notch signalling is implicated in various diseases and cancers including solid tumours, such as breast and cervical cancers, and leukemias, such as T-cell Acute Lymphoblastic Leukemia (T-ALL). Notch is a transmembrane receptor activated by transmembrane ligands of the DSL family (Delta/Serrate/Lag-2). Whereas oncogenic mutations have been identified in the Notch receptor, many Notch-mediated cancers remain ligand-dependent. Strikingly, the molecular mechanisms that regulate ligand activation are still poorly characterized as compared to those regulating the Notch receptor itself. Using a co-culture assay with a luciferase Notch reporter, we performed the first genome-wide RNAi screen aiming specifically at identifying regulators of Notch ligands in the signal-sending cell. We thereby unraveled new classes of common regulators for both Delta-like1 and 4 ligands. These regulators include protease inhibitors, transcription factors and various genes of unknown function such as Tmem128 (Transmembrane protein 128), or of previously characterized function such as the molecular co-chaperone Cdc37 (Cell division cycle 37 homolog). We next developed functional secondary screens where we demonstrated that our hits are important for Notch-mediated events, such as normal T-cell differentiation, and survival of pre-leukemic stem cells (pre-LSCs) isolated from a mouse model of T-ALL. Moreover, we showed that top hits from the pre-LSC survival screen are also required for the self-renewal activity of pre-LSCs. Finally, we performed a preliminary molecular characterization of two newly identified regulators; Tmem128 and Cdc37 in order to investigate their mechanism of action on Delta-like ligands. Altogether, this study led to the identification of novel Notch pathway regulators that could serve as potential therapeutic targets in Notch cancers, as exemplified by the T-ALL model. Elucidating the finer details that underlie the molecular functions of these regulators will be critical to develop pharmacological inhibitors to counteract their action and impede Notch signalling in cancer

Hydrologie et biogéochimie du bassin versant du fleuve Ibrahim : Un observatoire du fonctionnement de la zone critique au Liban

Cette thèse constitue une étude de référence sur la qualité des ressources hydriques du bassin versant du fleuve Ibrahim au Liban, notamment avant la construction d’un grand barrage (Jannah). Pour ce faire, 7 stations (NI7 à NI1) ont été sélectionnées de l’amont vers l’aval sur l’Ibrahim et ses sources karstiques. L’ensemble des sept sous bassins a été caractérisé d’un point de vue hydroclimatologie et états de surface (sols, végétation, cultures, géologie, relief). Les débits mesurés à l’amont (2 stations) et à l’aval (1 station) nous ont permis de reconstituer les débits des autres stations intermédiaires grâce à des relations débits-surfaces spécifiques. À partir de prélèvements et d’analyses chimiques de la composition des eaux tout au long d’un cycle hydrologique et avec une fréquence mensuelle, les flux de matières exportées en solution par l’Ibrahim ont été estimés à 122 372 t/an. 80% de ce tonnage est exporté durant la période des hautes eaux. À partir de ce tonnage, on a pu estimer que l’altération chimique des roches carbonatées sur l’ensemble du bassin s’effectue à la vitesse de 81 cm/10000 ans. Cette altération consomme un flux élevé de CO2 typique des régions carbonatées soumises à un drainage intense (1500 mm/an), soit 2,23 x106 moles/km2/an de CO2. L’analyse de la concentration en éléments traces dans les sédiments de fond des cours d’eau, intégrateurs des transports solides, en hautes eaux et en basses eaux, montre des concentrations élevées pour le Sc, V, Cr, Co, Ni, Ga et Cu en passant de NI5 jusqu’à NI2. L’évaluation du degré de cette contamination et de sa variation spatio-temporelle a été effectuée grâce au facteur d’enrichissement en normalisant par rapport à l’aluminium et en prenant les sédiments de la station amont NI7 (source karstique) considérés comme peu ou pas contaminés en ET, comme fond géochimique naturel. Des teneurs élevées en Zn, Pb, Cu et d’autres éléments traces montrent que dans cette région où les activités industrielles, agricoles, et urbaines sont développées, il existe un apport anthropique non négligeable en éléments métalliques. Mais cette contamination reste modéré

One step electrodeposition of Ag-decorated ZnO nanowires

The final publication is available at Springer via http://dx.doi.org/10.1007/s10008-016-3476-0.A new route for synthesizing Ag-decorated ZnO nanowires (NWs) on conductive glass substrates using a one-step electrodeposition technique is described here. The structural, optical, and photoelectrochemical properties of Ag-decorated ZnO nanowires were studied in detail using techniques such X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, UV-visible spectroscopy, photoluminescence, and photoelectrochemical measurements. Both pure and Ag-decorated ZnO nanowires were found to crystallize in the wurtzite structure, irrespective of their Ag contents. Increasing the Ag content from pure ZnO NWs to 3% Ag ZnO NWs decreases the photoluminescence intensity, shifts the optical band gap to the red, and increases the photocurrent up to threefold. This behavior was attributed to the surface plasmon resonance effect induced by the Ag nanoparticles, which inhibits charge recombination and improves charge transport on the ZnO surface.B.S. acknowledges the Nanomaterials and Systems Laboratory for Renewable Energies, Research and Technology Centre of Energy Technoparc Borj Cedria for financial support. This work was supported by the Ministerio de Economia y Competitividad (ENE2013-46624-C4-4-R) and the Generalitat Valenciana (Prometeus 2014/044).Slimi, B.; Ben Assaker, I.; Kriaa, A.; Marí, B.; Chtourou, R. (2017). One step electrodeposition of Ag-decorated ZnO nanowires. 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Synthesis and characterization of perovskite FAPbBr(3-x) I (x) thin films for solar cells

[EN] FAPbI3, FAPbBr3, and FAPbBr3-xIx perovskite thin films were produced in a single step from a solution containing a mixture of FAI, PbI2, FABr, and PbBr2 (FA = formamidinium). FAPbBr3-xIx perovskite thin films were deposited onto ITO-coated glass substrates by spin coating. X-ray diffraction analyses confirmed that these thin-film perovskites crystallize in the cubic phase (Pm-3 m) for all composition range 0 B x B 3. Mixed lead perovskites showed a high absorbance in the UV¿Vis range. The optical band gap was estimated from spectral absorbance measurements. It was found that the onset of the absorption edge for FAPbBr3¿xIx thin films ranges between 1.47 and 2.20 eV for x = 0 and x = 3, respectively. Photoluminescence emission energies for mixed halide perovskites were also dependent on their composition and presented intermediate values from 810.4 nm for FAPbI3 to 547.3 nm for FAPbBr3.This work was supported by Ministerio de Economia y Competitividad (ENE2016-77798-C4-2-R) and Generalitat valenciana (Prometeus 2014/044).Slimi, B.; Mollar García, MA.; Ben Assaker, I.; Kriaa, A.; Chtourou, R.; Marí, B. (2017). Synthesis and characterization of perovskite FAPbBr(3-x) I (x) thin films for solar cells. Monatshefte für Chemie - Chemical Monthly. 148(5):835-844. https://doi.org/10.1007/s00706-017-1958-0S835844148