1,560,753 research outputs found

    Evaluation de l’Impact des Activités Anthropiques sur la Séquestration de Carbone dans la Parc National du Mont Sangbé, en Côte d’Ivore

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    La prĂ©sente Ă©tude concerne l'Ă©valuation de l'impact des activitĂ©s anthropiques sur la capacitĂ© de sĂ©questration du carbone du Parc National du Mont SangbĂ© (PNMS) fortement anthropisĂ©. L'objectif principal Ă©tait de contribuer Ă  l'estimation de l'effet des activitĂ©s anthropiques sur la capacitĂ© de sĂ©questration du carbone du PNMS. Plus spĂ©cifiquement, il s'agissait : (1) de caractĂ©riser les activitĂ©s anthropiques responsables de la dĂ©gradation du PNMS et (2) d'estimer l'impact de ces activitĂ©s sur la capacitĂ© de sĂ©questration du carbone du PNMS. Pour mener Ă  bien l'Ă©tude, nous avons utilisĂ© un dispositif d'Ă©chantillonnage composĂ© de 14 blocs carrĂ©s de 1 ha chacun, comprenant chacun 100 parcelles carrĂ©es de 100 m² (10 mx 10 m). La collecte des donnĂ©es a Ă©tĂ© effectuĂ©e Ă  l'aide d'un Ă©chantillonnage direct. Les activitĂ©s anthropiques dont les plus incidentes sont les pratiques agricoles, ont provoquĂ© la destruction massive d’espèces ligneuses arbrescentes dans le PNMS. Cela a occasionnĂ© une perte de capacitĂ© de sĂ©questration du carbone du PNMS estimĂ©e Ă  43 tC/ha. Pour remĂ©dier Ă  cette situation, il a Ă©tĂ© recommandĂ© d'intensifier la surveillance du parc, la sensibilisation des populations et le dĂ©velopper des micro-projets pour les riverains.   The present study concerns the evaluation of the impact of anthropogenic activities on the carbon sequestration capacity of the highly anthropized Mont SangbĂ© National Park. The main objective was to contribute to the estimation of the effect of anthropogenic activities on the carbon sequestration capacity of the MSNP. Specifically, it was to : (1) characterize the anthropogenic activities responsible for the degradation and (2) estimate the impact of these activities on the carbon sequestration capacity of the MSNP. To conduct the study, we used a sampling design consisting of 14 square blocks of 1 ha each, each comprising 100 square plots of 100 m² (10 mx 10 m). Data collection was conducted using direct sampling. Anthropogenic activities, of which the most incidental are agricultural practices, have caused massive destruction of woody tree species in the SMNP. This has resulted in a reduction in the density, land area and diameter structure of woody stands on impacted sites. This has resulted in an estimated loss of carbon sequestration capacity of 43 tC/ha across the park. To remedy this situation, it was recommended to intensify the monitoring of the park, raise awareness and develop micro-projects for the local populations

    Evaluation de l’Impact des Activités Anthropiques sur la Séquestration de Carbone dans la Parc National du Mont Sangbé, en Côte d’Ivore

    Get PDF
    La prĂ©sente Ă©tude concerne l'Ă©valuation de l'impact des activitĂ©s anthropiques sur la capacitĂ© de sĂ©questration du carbone du Parc National du Mont SangbĂ© (PNMS) fortement anthropisĂ©. L'objectif principal Ă©tait de contribuer Ă  l'estimation de l'effet des activitĂ©s anthropiques sur la capacitĂ© de sĂ©questration du carbone du PNMS. Plus spĂ©cifiquement, il s'agissait : (1) de caractĂ©riser les activitĂ©s anthropiques responsables de la dĂ©gradation du PNMS et (2) d'estimer l'impact de ces activitĂ©s sur la capacitĂ© de sĂ©questration du carbone du PNMS. Pour mener Ă  bien l'Ă©tude, nous avons utilisĂ© un dispositif d'Ă©chantillonnage composĂ© de 14 blocs carrĂ©s de 1 ha chacun, comprenant chacun 100 parcelles carrĂ©es de 100 m² (10 mx 10 m). La collecte des donnĂ©es a Ă©tĂ© effectuĂ©e Ă  l'aide d'un Ă©chantillonnage direct. Les activitĂ©s anthropiques dont les plus incidentes sont les pratiques agricoles, ont provoquĂ© la destruction massive d’espèces ligneuses arbrescentes dans le PNMS. Cela a occasionnĂ© une perte de capacitĂ© de sĂ©questration du carbone du PNMS estimĂ©e Ă  43 tC/ha. Pour remĂ©dier Ă  cette situation, il a Ă©tĂ© recommandĂ© d'intensifier la surveillance du parc, la sensibilisation des populations et le dĂ©velopper des micro-projets pour les riverains.   The present study concerns the evaluation of the impact of anthropogenic activities on the carbon sequestration capacity of the highly anthropized Mont SangbĂ© National Park. The main objective was to contribute to the estimation of the effect of anthropogenic activities on the carbon sequestration capacity of the MSNP. Specifically, it was to : (1) characterize the anthropogenic activities responsible for the degradation and (2) estimate the impact of these activities on the carbon sequestration capacity of the MSNP. To conduct the study, we used a sampling design consisting of 14 square blocks of 1 ha each, each comprising 100 square plots of 100 m² (10 mx 10 m). Data collection was conducted using direct sampling. Anthropogenic activities, of which the most incidental are agricultural practices, have caused massive destruction of woody tree species in the SMNP. This has resulted in a reduction in the density, land area and diameter structure of woody stands on impacted sites. This has resulted in an estimated loss of carbon sequestration capacity of 43 tC/ha across the park. To remedy this situation, it was recommended to intensify the monitoring of the park, raise awareness and develop micro-projects for the local populations

    Verbatim Bodies: for a Theater that Emerges from the Physicality of the Performers

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    https://remix.berklee.edu/able-assembly-conference/1085/thumbnail.jp

    The CBF3 complex structure and function during point centromere establishment

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    This thesis investigates the structure and function of the kinetochore centromere binding factor 3 (CBF3) complex. The kinetochore is a multi-protein complex, which controls the chromosome attachment to the mitotic or meiotic spindle and nucleates on the centromere. The latter is a specific chromosomal loci divided in two groups highly divergent in length and composition: regional and point centromeres. Regional centromeres are composed of long arrays of repetitive DNA supporting multiple microtubule nucleations. On the contrary, point centromeres are characterised by a short and conserved sequence supporting a single microtubule attachment. Despite this discrepancy, both point and regional centromere establishment start with the replacement of the histone H3 by the Cse4 histone variant. The point centromeres H3 replacement by Cse4 (loading) solely relies on the recognition of a conserved DNA sequence (licensing) by the CBF3 complex, a crucial centromere element composed by four essential proteins: Ndc10, Cep3, Ctf13 and Skp1. Ctf13 and Skp1 regulate the CBF3 assembly. Cep3, the licensing element, recognises the point centromere DNA sequence. Finally, Ndc10 acts as the loading factor of the CBF3 complex by recruiting Cse4. At the start of this work the structural basis underlying the mechanism of Cse4 loading by Ndc10 was speculative and the structure of the complex was unknown, mainly because of the inherent instability of Ctf13. In this study, I solved the X-ray structure of Ndc10 Nterminal domain (Ndc10NTD) at 1.9 Å and highlighted the unsuspected similarities of the Ndc10NTD fold with the tyrosine recombinase/λ-integrase family. Interestingly, Ndc10 lost the catalytic activity characteristic to the family but conserved a strong DNA binding, which I characterised by structural and mutagenesis studies. Furthermore, I described the Ndc10 C-terminal domain, which displays another DNA binding domain and supports the Ndc10 dimerisation. Ultimately, this work will lead to the structural characterisation of the Ndc10 dimer bound to DNA, of which preliminary crystallisation and data collection results are presented. Finally, I will introduce early results on the purification of the Ctf13 subdomains and the CBF3 reconstitution, a challenging step toward the comprehension of the point centromere establishment

    Niveau de Recherche de Sensations et Comportement d’Alcoolisation Chez des Adolescents en Milieu Scolaire a Abidjan

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    Cette Ă©tude analyse la relation entre le niveau de recherche de sensations et le comportement d’alcoolisation chez des adolescents en milieu scolaire Ă  Abidjan. Pour ce faire, l’étude porte sur un Ă©chantillon de 240 participants dont l’âge est compris entre 12 et 19 ans.  Ils ont Ă©tĂ© soumis, au test de mesure de la recherche de sensations (AISS) de Arnett (1994) pour Ă©valuer leur niveau de recherche de sensations. Les comportements d’alcoolisation ont Ă©tĂ© dĂ©terminĂ©s par le questionnaire (ADOSPA) de Knight & al (2002) ainsi qu’un guide d’entretien. Les rĂ©sultats indiquent que les adolescents dont le niveau de recherche de sensations est Ă©levĂ© manifestent un comportement d’alcoolisation auto-thĂ©rapeutique en association avec d’autres substances psychoactives pour rĂ©pondre Ă  leur besoin physiologique contrairement Ă  leurs homologues qui ont un niveau de recherche de sensations faible.  Ces rĂ©sultats corroborent ceux des Ă©tudes antĂ©rieures rĂ©alisĂ©es sur les comportements Ă  risques. Ils confirment les prĂ©dictions comportementales des thĂ©ories examinĂ©es. De tels rĂ©sultats mettent en  Ă©vidence  la nĂ©cessitĂ© de mener des actions de prĂ©vention de l’usage de substances psychoactives chez les adolescents. Cette Ă©tude pourrait Ă©galement servir Ă  la rĂ©glementation de l’accès, la vente et la consommation des boissons alcoolisĂ©es. Notamment la rĂ©duction des espaces habilitĂ©s Ă  vendre l’alcool, l’interdiction d’achat d’alcool au moins de 18 ans et la limitation des publicitĂ©s sur l’alcool.   This study analyzes the relationship between the level of sensation seeking and drinking behaviors among adolescents in school in Abidjan. To do this, the study focuses on a sample of 240 participants whose age is between 12 and 19 years old. They were subjected to the Arnett (1994) Sensation Seeking Measurement Test (ISSA) to assess their level of sensation seeking. Drinking behaviors were determined by the questionnaire (ADOSPA) of Knight & al (2002) as well as an interview guide. The results indicate that adolescents with a high level of sensation seeking demonstrate self-medicated drinking behavior in combination with other psychoactive substances to meet their physiological need unlike their counterparts with a high level of sensation seeking. low. These results corroborate those of previous studies on risky behaviors. They confirm the behavioral predictions of the theories examined. Such results highlight the need to carry out actions to prevent the use of psychoactive substances among adolescents. This study could also be used to regulate access, sale and consumption of alcoholic beverages. In particular the reduction of spaces authorized to sell alcohol, the prohibition of the purchase of alcohol at least 18 years old and the limitation of alcohol advertisements
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