599 research outputs found

    Law is discourse. Discourse is rhetoric. Therefore, Law is rhetoric. A rhetorical analysis of the responsibility to protect

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    It is estimated that the yearly cost of containing and responding to conflict worldwide is nearly US$10 trillion. Meanwhile, the level of global peace and security is on the steady decline and gross violations of human rights and massive loss of human life are not yet an issue of the past. As such, contemporary international legal doctrines like The Responsibility to Protect (R2P) have emerged in an effort to prevent and react to global conflict. This thesis performs an atypical study of R2P by performing a rhetorical analysis of the doctrine through the lens of Orientalism and post-colonial theory. In doing so, this thesis reveals the ways in which the discourse of R2P functions as a mode of reproducing and exercising power over the ‘Other’ of international law, the Orient. It also shows that the rhetorical persuasiveness of the R2P narrative is itself an Orientalist discourse that recreates and reinforces colonial binaries between the Occident and the Orient, making the Orient susceptible and subject to contemporary forms of control and domination in the name of humanitarianism. By confronting the continuing implications of colonial history on contemporary international law, this thesis has recognized and deconstructed through rational analysis the lasting psychological and legal effects of the colonial enterprise into the twenty-first century

    Roles of the Environment in Plant Life-History Trade-offs

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    Variation in plant life-history and functional traits at between- and within-species levels has key ecological consequences, in which environmental settings impose strong selective pressures and play a vital role throughout life cycles. Our general notion for plant life-history strategies may be that, relative to tall, long-lived plants, short-lived species have features of small stature, small-seededness, rapid growth, and low seedling survival (k- versus r-selection). Rate of evolution may be an important agent of selection and annals evolve more rapidly than perennial congeners. These empirical observations prompt a suite of enticing questions, such as how do life-history traits interplay with functional trait at late stages of regeneration? what are the primary trade-offs in a cohort of key life-history traits that may have undergone stabilizing selection? and how do environmental filters differently affect adaptive trait variation in annuals and perennials? In this chapter, we intend to address aforementioned questions via assembling our updated knowledge with emphasis on seed mass and temporal and spatial dimensions of seed dispersal. Through such synthesis, we wish to raise awareness about life-history trade-offs and provide a holistic understanding of the extent to which climate change is likely to impact plant adaptation and eco-evolutionary trajectories of life-history phenotypes

    Correction of anterior hypospadias without urethroplasty: glanular rotation procedure (the Hay technique)

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    Objectives: The aim was to present a simple technique for the correction of anterior hypospadiases without meatal advancement or urethroplasty.Background: Most of the techniques described for the correction of anterior hypospadias had the risk of complications: recession, flaying of the glans, fistula, and meatal stenosis that is not accepted when dealing with a trivial anomaly that is done only for cosmetic correction. A simple technique for correcting granular and some forms of coronal hypospadias without meatal advancement or urethroplasty is presented.Patients and methods: From June 2013 to June 2016, 183 patients presented for surgical repair of glanular or coronal hypospadias. The technique of glanular rotation procedure (GRP) was applied only for those cases that matched the criteria settled after degloving of the penis with an incision made 2mm proximal to the meatus touching the glans on both sides for 3–4 mm. Once the uppermost part of the meatus is at the same line with the upper end of the glans on both sides, the technique is applicable. The patients were followed in the OPD for 1 year after the repair for the evaluation of the results of the technique: the urinary stream, meatal size and position, presence of fistula, and the final cosmetic appearance.Results: Ninety-eight out of 183 (53.6%) boys had matched the criteria for application of the GRP technique. Their age ranged from 6 months to 3 years. All but three had an apical, slit-like meatus with good stream without stenosis and 2–3mm glans tissue encircling the ventral side of the meatus. Four cases had complications in the form of meatal stenosis in two cases, disruption of the glans in one case, and coronal fistula in one case. The overall complication rate was 4.1%.Conclusion: In properly selected cases, GRP is a simple efficient technique that has the advantage of reconstructing the glans over the urethra without the need of meatal advancement or urethroplasty.Keywords: coronal hypospadias, glanular hypospadias, without urethroplast

    Single-step BLUP with varying genotyping effort in open-pollinated Picea glauca

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    Maximization of genetic gain in forest tree breeding programs is contingent on the accuracy of the predicted breeding values and precision of the estimated genetic parameters. We investigated the effect of the combined use of contemporary pedigree information and genomic relatedness estimates on the accuracy of predicted breeding values and precision of estimated genetic parameters, as well as rankings of selection candidates, using single-step genomic evaluation (HBLUP). In this study, two traits with diverse heritabilities [tree height (HT) and wood density (WD)] were assessed at various levels of family genotyping efforts (0, 25, 50, 75, and 100%) from a population of white spruce (Picea glauca) consisting of 1694 trees from 214 open-pollinated families, representing 43 provenances in Québec, Canada. The results revealed that HBLUP bivariate analysis is effective in reducing the known bias in heritability estimates of open-pollinated populations, as it exposes hidden relatedness, potential pedigree errors, and inbreeding. The addition of genomic information in the analysis considerably improved the accuracy in breeding value estimates by accounting for both Mendelian sampling and historical coancestry that were not captured by the contemporary pedigree alone. Increasing family genotyping efforts were associated with continuous improvement in model fit, precision of genetic parameters, and breeding value accuracy. Yet, improvements were observed even at minimal genotyping effort, indicating that even modest genotyping effort is effective in improving genetic evaluation. The combined utilization of both pedigree and genomic information may be a cost-effective approach to increase the accuracy of breeding values in forest tree breeding programs where shallow pedigrees and large testing populations are the norm.Inst. de Recursos BiológicosFil: Rateliffe, Blaise. University of British Columbia, Faculty of Forestry. Department of Forest and Conservation Sciences; CanadáFil: El-Dien, Omnia Gamal. University of British Columbia, Faculty of Forestry. Department of Forest and Conservation Sciences; Canadá. Alexandria University. Faculty of Pharmacy. Pharmacognosy Department; EgiptoFil: Cappa, Eduardo Pablo. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Recursos Biológicos; ArgentinaFil: Porth, Ilga. Université Laval Québec. Faculté de Foresterie, de Géographie et Géomatique. Départment des Sciences du Bois et de la Forêt; CanadáFil: Klapste, Jaroslav. Czech University of Life Sciences Prague. Faculty of Forestry and Wood Sciences. Department of Genetics and Physiology of Forest Trees; República Checa. Scion (New Zealand Forest Research Institute Ltd.); Nueva ZelandaFil: El-Kassaby, Yousry A. University of British Columbia, Faculty of Forestry. Department of Forest and Conservation Sciences; CanadáFil: Chen, Charles. Oklahoma State University. Department of Biochemistry and Molecular Biology; Estados Unido

    The role of forest genetic resources in responding to biotic and abiotic factors in the context of anthropogenic climate change

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    The current distribution of forest genetic resources on Earth is the result of a combination of natural processes and human actions. Over time, tree populations have become adapted to their habitats including the local ecological disturbances they face. As the planet enters a phase of human-induced climate change of unprecedented speed and magnitude, however, previously locally-adapted populations are rendered less suitable for new conditions, and ‘natural’ biotic and abiotic disturbances are taken outside their historic distribution, frequency and intensity ranges. Tree populations rely on phenotypic plasticity to survive in extant locations, on genetic adaptation to modify their local phenotypic optimum or on migration to new suitable environmental conditions. The rate of required change, however, may outpace the ability to respond, and tree species and populations may become locally extinct after specific, but as yet unknown and unquantified, tipping points are reached. Here, we review the importance of forest genetic resources as a source of evolutionary potential for adaptation to changes in climate and other ecological factors. We particularly consider climate-related responses in the context of linkages to disturbances such as pests, diseases and fire, and associated feedback loops. The importance of management strategies to conserve evolutionary potential is emphasised and recommendations for policy-makers are provided

    Stability in and Correlation between Factors Influencing Genetic Quality of Seed Lots in Seed Orchard of Pinus tabuliformis Carr. over a 12-Year Span

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    Coniferous seed orchards require a long period from initial seed harvest to stable seed production. Differential reproductive success and asynchrony are among the main factors for orchard crops year-to-year variation in terms of parental gametic contribution and ultimately the genetic gain. It is fundamental in both making predictions about the genetic composition of the seed crop and decisions about orchard roguing and improved seed orchard establishment. In this paper, a primary Chinese pine seed orchard with 49 clones is investigated for stability, variation and correlation analysis of factors which influence genetic quality of the seed lots from initial seed harvest to the stable seed production over a 12 years span. Results indicated that the reproductive synchrony index of pollen shedding has shown to be higher than that of the strobili receptivity, and both can be drastically influenced by the ambient climate factors. Reproductive synchrony index of the clones has certain relative stability and it could be used as an indication of the seed orchard status during maturity stage; clones in the studied orchard have shown extreme differences in terms of the gametic and genetic contribution to the seed crop at the orchard's early production phase specifically when they severe as either female or male parents. Those differences are closely related to clonal sex tendency at the time of orchard's initial reproduction. Clonal gamete contribution as male and female parent often has a negative correlation. Clone utilization as pollen, seed or both pollen and seed donors should consider the role it would play in the seed crop; due to numerous factors influencing on the mating system in seed orchards, clonal genetic contribution as male parent is uncertain, and it has major influence on the genetic composition in the seed orchard during the initial reproductive and seed production phase

    Genomic diversity evaluation of populus trichocarpa germplasm for rare variant genetic association studies

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    Genome-wide association studies are powerful tools to elucidate the genome-to-phenomerelationship. In order to explain most of the observed heritability of a phenotypic trait, asufficient number of individuals and a large set of genetic variants must be examined. Thedevelopment of high-throughput technologies and cost-efficient resequencing of completegenomes have enabled the genome-wide identification of genetic variation at large scale.As such, almost all existing genetic variation becomes available, and it is now possible toidentify rare genetic variants in a population sample. Rare genetic variants that were usuallyfiltered out in most genetic association studies are the most numerous genetic variationsacross genomes and hold great potential to explain a significant part of the missingheritability observed in association studies. Rare genetic variants must be identified withhigh confidence, as they can easily be confounded with sequencing errors. In this study,we used a pre-filtered data set of 1,014 purePopulus trichocarpaentire genomes toidentify rare and common small genetic variants across individual genomes. We comparedvariant calls betweenPlatypusandHaplotypeCallerpipelines, and we further applied strictqualityfilters for improved genetic variant identification. Finally, we only retained geneticvariants that were identified by both variant callers increasing calling confidence. Based onthese shared variants and after stringent qualityfiltering, we found high genomic diversity inP. trichocarpagermplasm, with 7.4 million small genetic variants. Importantly, 377k non-synonymous variants (5% of the total) were uncovered. We highlight the importance ofgenomic diversity and the potential of rare defective genetic variants in explaining asignificant portion ofP. trichocarpa's phenotypic variability in association genetics. Theultimate goal is to associate both rare and common alleles with poplar's wood quality traitsto support selective breeding for an improved bioenergy feedstock

    Linkage disequilibrium vs. pedigree: Genomic selection prediction accuracy in conifer species

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    Background The presupposition of genomic selection (GS) is that predictive accuracies should be based on population-wide linkage disequilibrium (LD). However, in species with large, highly complex genomes the limitation of marker density may preclude the ability to resolve LD accurately enough for GS. Here we investigate such an effect in two conifer species with similar to 20 Gbp genomes, Douglas-fir (Pseudotsuga menziesiiMirb. (Franco)) and Interior spruce (Picea glauca(Moench) Voss xPicea engelmanniiParry ex Engelm.). Random sampling of markers was performed to obtain SNP sets with totals in the range of 200-50,000, this was replicated 10 times. Ridge Regression Best Linear Unbiased Predictor (RR-BLUP) was deployed as the GS method to test these SNP sets, and 10-fold cross-validation was performed on 1,321 Douglas-fir trees, representing 37 full-sib F(1)families and on 1,126 Interior spruce trees, representing 25 open-pollinated (half-sib) families. Both trials are located on 3 sites in British Columbia, Canada. Results As marker number increased, so did GS predictive accuracy for both conifer species. However, a plateau in the gain of accuracy became apparent around 10,000-15,000 markers for both Douglas-fir and Interior spruce. Despite random marker selection, little variation in predictive accuracy was observed across replications. On average, Douglas-fir prediction accuracies were higher than those of Interior spruce, reflecting the difference between full- and half-sib families for Douglas-fir and Interior spruce populations, respectively, as well as their respective effective population size. Conclusions Although possibly advantageous within an advanced breeding population, reducing marker density cannot be recommended for carrying out GS in conifers. Significant LD between markers and putative causal variants was not detected using 50,000 SNPS, and GS was enabled only through the tracking of relatedness in the populations studied. Dramatically increasing marker density would enable said markers to better track LD with causal variants in these large, genetically diverse genomes; as well as providing a model that could be used across populations, breeding programs, and traits

    Natural recovery of genetic diversity by gene flow in reforested areas of the endemic Canary Island pine, Pinus canariensis

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    The endemic pine, Pinus canariensis, forms one of the main forest ecosystems in the Canary Islands. In this archipelago, pine forest is a mosaic of natural stands (remnants of past forest overexploitation) and artificial stands planted from the 1940's. The genetic makeup of the artificially regenerated forest is of some concern. The use of reproductive material with uncontrolled origin or from a reduced number of parental trees may produce stands ill adapted to local conditions or unable to adapt in response to environmental change. The genetic diversity within a transect of reforested stands connecting two natural forest fragments has been studied with nuclear and chloroplast microsatellites. Little genetic differentiation and similar levels of genetic diversity to the surrounding natural stands were found for nuclear markers. However, chloroplast microsatellites presented lower haplotype diversity in reforested stands, and this may be a consequence of the lower effective population size of the chloroplast genome, meaning chloroplast markers have a higher sensitivity to bottlenecks. Understory natural regeneration within the reforestation was also analysed to study gene flow from natural forest into artificial stands. Estimates of immigration rate into artificially regenerated forest were high (0.68-0.75), producing a significant increase of genetic diversity (both in chloroplast and nuclear microsatellites), which indicates the capacity for genetic recovery for P. canariensis reforestations surrounded by larger natural stands

    Unweaving the population structure and genetic diversity of Canadian shrub willow

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    Perennial shrub willow are increasingly being promoted in short-rotation coppice systems as biomass feedstocks, for phytoremediation applications, and for the diverse ecosystem services that can accrue. This renewed interest has led to widespread willow cultivation, particularly of non-native varieties. However, Canadian willow species have not been widely adopted and their inherent diversity has not yet been thoroughly investigated. In this study, 324 genotypes of Salix famelica and Salix eriocephala collected from 33 sites of origin were analyzed using 26,016 single nucleotide polymorphisms to reveal patterns of population structure and genetic diversity. Analyses by Bayesian methods and principal component analysis detected five main clusters that appeared to be largely shaped by geoclimatic variables including mean annual precipitation and the number of frost-free days. The overall observed (HO) and expected (HE) heterozygosity were 0.126 and 0.179, respectively. An analysis of molecular variance revealed that the highest genetic variation occurred within genotypes (69%), while 8% of the variation existed among clusters and 23% between genotypes within clusters. These findings provide new insights into the extent of genetic variation that exists within native shrub willow species which could be leveraged in pan-Canadian willow breeding programs.Fil: Murphy, Emily K. University of British Columbia. Faculty of Forestry. Department of Wood Science; CanadáFil: Cappa, Eduardo Pablo. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Recursos Biológicos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Soolanayakanahally, Raju Y. Agriculture and Agri-Food Canada. Indian Head Research Farm; Canadá. Agriculture and Agri-Food Canada. Saskatoon Research and Development Centre; Canadá.Fil: El-Kassaby, Yousry A. University of British Columbia. Faculty of Forestry. Department of Forest and Conservation Sciences; CanadáFil: Parkin, Isobel A.P. Agriculture and Agri-Food Canada. Saskatoon Research and Development Centre; Canadá.Fil: Schroeder, William R. Agriculture and Agri-Food Canada. Indian Head Research Farm; CanadáFil: Mansfield, Shawn D. University of British Columbia. Faculty of Forestry. Department of Wood Science; Canad
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