Éditeur(s) : The College of the Bahamas The College of the Bahamas ( Nassau, Bahamas )
Résumé : (Statement of Responsibility) School of Nursing and Allied Health Professions
First annual pinning ceremony held in the Forecourt, Portia M. Smith Student Services Centre, Sunday May 22, 2005 at the College of The Bahamas, Oakes Field Campus.
Bahamas
Bahamas
Bahamas

Droits : All rights reserved by the source institution.
http://ufdc.ufl.edu/AA00021212/00001

Éditeur(s) : The College of the Bahamas The College of the Bahamas ( Nassau, Bahamas )
Résumé : (Statement of Responsibility) School of Nursing and Allied Health Professions
Ceremony held Tuesday, 23rd May, 2006 at 7:00 p.m. at the Band Shell Grounds, Oakes Field Campus, Poinciana Drive, Nassau, Bahamas
Bahamas
Bahamas
Bahamas

Droits : All rights reserved by the source institution.
http://ufdc.ufl.edu/AA00021212/00002

Éditeur(s) : HAL CCSD National Research Council Canada
Résumé :  
Le développement de l'axe principal d'arbres de deux peuplements de chêne sessile âgés respectivement de 15 et 29 ans a été reconstitué par l'observation simultanée de marqueurs morphologiques et anatomiques de la croissance. La comparaison de la structure morphologique des pousses annuelles et des unités de croissance selon leur âge ontogénique ou leur année de formation a permis de dégager des tendances dues au stade de développement de la plante ou aux effets climatiques annuels. Au cours du développement, trois phases se distinguent. La première se traduit par la formation de pousses annuelles monocycliques de taille constante et correspond probablement à la présence du couvert forestier. Dans une seconde phase, les modalités de développement intrinsèques à l'arbre s'expriment en priorité ; le taux de polycyclisme, comme la longueur des pousses annuelles, augmente régulièrement d'une année sur l'autre, et on observe une forte différenciation entre les unités de croissance successives d'une même pousse annuelle bicyclique. Lors de la troisième phase, les facteurs environnementaux semblent avoir une influence plus marquée sur la croissance des individus. La longueur des différentes structures est stationnaire, malgré des fluctuations inter-annuelles. Les différences entre les deux unités de croissance successives des pousses annuelles bicycliques ne sont pas systématiques.
ISSN: 0008-4026

hal-01032105
https://hal.archives-ouvertes.fr/hal-01032105
DOI : 10.1139/cjb-78-3-361

Éditeur(s) : HAL CCSD
Résumé :  
For a comprehensive evaluation of human influences on the genetic system, the simulation model EGO-GENE was developed. The model combines population genetic and population dynamic processes with forest growth models. The dynamics of genetic structures (single locus and multilocus genotypes up to 200 loci) can be simulated. Spatial and temporal genetic dynamics are included in the model. Overlapping or separated generations can be created and different modes of mating systems can be implemented. The model can be run with empirical and fictitious input data. The simulated genetic structures can be directly analysed with established genetic analysis programmes. An example demonstrates the use of the model far validation of interactions among components of the mating system. Another example demonstrates the applicability of the model in decision-making for seed sampling strategies. The genetic differences between the adult trees and the harvested seeds and the danger of genetic drift regarding to different seed sampling strategies are investigated by use of the genetic distance and the reproductively effective population size.
Silvae genetica

hal-01032083
https://hal.archives-ouvertes.fr/hal-01032083

Éditeur(s) : HAL CCSD Nature Publishing Group
Résumé : Nucleotide diversity was assessed within nine candidate genes (in total 4.6 kb) for the time of bud burst in nine sessile oak (Quercus petraea) populations distributed in central and northern Europe. The sampled populations were selected on the basis of their contrasting time of bud burst observed in common garden experiments (provenance tests). The candidate genes were selected according to their expression profiles during the transition from quiescent to developing buds and/or their functional role in model plants. The overall nucleotide diversity was large (pi(tot) - 6.15 x 10(-3); pi(silent) - 11.2 x 10(-3)), but population differentiation was not larger than for microsatellites. No outlier single-nucleotide polymorphism (SNP), departing from neutral expectation, was found among the total of 125 SNPs. These results contrasted markedly with the significant associations that were observed between the candidate genes and bud burst in segregating populations. Quantitative trait loci (QTLs) for bud burst were identified for 13 year*site seasonal observations in a cloned mapping pedigree. Nineteen QTLs were detected, and QTLs located on linkage groups 2, 5 and 9 contributed repeatedly to more than 12% of the phenotypic variation of the trait. Eight genes were polymorphic in the two parents of the pedigree and could be mapped on the existing genetic map. Five of them located within the confidence intervals of QTLs for bud burst. Interestingly, four of them located within the three QTLs exhibiting the largest contributions to bud burst.
ISSN: 0018-067X

hal-01032156
https://hal.archives-ouvertes.fr/hal-01032156
DOI : 10.1038/hdy.2009.170

Éditeur(s) : HAL CCSD Wiley-Blackwell Wiley
Résumé : A new record from the heart of the Moroccan Middle Atlas cedar forests spans the last 18 000 years and provides valuable insight into our understanding of the natural vegetation and environmental changes. The approach is based on the study of pollen content, geochemical elements and grain size analysis. The pollen data indicate that the vegetation was dominated by herbaceous plants until 9000 BP. Such open landscape allowed greater soil erosion and an input of chemical elements from the watershed. After 9000 BP, tree cover, mainly oak, increased slightly and was accompanied by a higher taxonomic diversity. However, several steppe elements remain well represented in the area until 5000 BP, which suggests that the climate was rather dry during the first part of the Holocene. After 6000 BP, the climate became more favourable to expansion of the forest ecosystems, including Cedrus atlantica, thereby reducing erosion. A strong reduction of the tree pollen percentages is recorded after 2000 BP, which may be related to increasing human activities during the Roman period. These forest changes are concomitant with an increase of lead and copper concentrations in the record, probably related to Roman metalworking activities.
ISSN: 0267-8179

hal-01122848
https://hal.archives-ouvertes.fr/hal-01122848
DOI : 10.1002/jqs.2708