919 resultados para aménagement forestier durable


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Mode of access: Internet.

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Author's name at head of title.

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Contribution from Forest Service.

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At head of title: International congress for the study of the principles of a durable peace. Berne, 1916.

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Description based on: Jan. 1979; title from cover.

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Résolution 697(XXXVI) Résolution Horizons 2030 .-- Résolution 698(XXXVI) Calendrier de conférences de la CEPALC pour la période 2017-2018 .-- Résolution 699(XXXVI) Conférence régionale sur les femmes de l’Amérique latine et des Caraïbes .-- Resolution 700(XXXVI) Résolution de Mexico portant création du Forum des pays d’Amérique latine et des Caraïbes sur le développement durable .-- Résolution 701(XXXVI) Appui aux travaux de l’Institut latino-américain et des Caraïbes de planification économique et sociale (ILPES) .-- Résolution 702(XXXVI) Conférence statistique des Amériques de la Commission économique pour l’Amérique latine et les Caraïbes .-- Résolution 703(XXXVI) Conférence régionale sur développement social de l’Amérique latine et des Caraïbes .-- Résolution 704(XXXVI) Programme de travail et priorités de la Commission économique pour l’Amérique latine et les Caraïbes pour la période biennale 2018-2019 .-- Résolution 705(XXXVI) Comité de développement et de coopération des Caraïbes .-- Résolution 706(XXXVI) Application du Principe 10 de la Déclaration de Rio sur l’environnement et le développement en Amérique latine et dans les Caraïbes .-- Résolution 707(XXXVI) Conférence régionale sur la population et le développement de l’Amérique latine et des Caraïbes .-- Résolution 708(XXXVI) Conférence ministérielle sur la société de l’information en Amérique latine et des Caraïbes .-- Résolution 709(XXXVI) Comité de coopération Sud-Sud .-- Résolution 710(XXXVI) Conférence sur les sciences, l’innovation et les technologies de l’information et des communications de la Commission économique pour l’Amérique latine et les Caraïbes .-- Résolution 711(XXXVI) Mise en oeuvre du Programme d’action de Vienne en faveur des pays en développement sans littoral pour la décennie 2014-2024 .-- Résolution 712(XXXVI) Intégration régionale de l’information statistique et géospatiale .-- Résolution 713(XXXVI) Suivi régional des résultats des conférences sur le financement du développement .-- Résolution 714(XXXVI) Lieu de la prochaine session.

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Himalayan adventure travel is a burgeoning industry in some mountainous regions of Nepal, India, and the Tibet Autonomous Region of the People‘s Republic of China. The development of a trekking and expedition mountaineering infrastructure has created economic opportunities in remote areas and allowed foreign visitors to embark on life-changing explorations. However, with the industry’s rapid, uneven, and largely unregulated growth have come environmental and resource challenges, the creation of new economic and social arrangements, and renewed questions of equity and safety. The current Himalayan adventure travel paradigm is unsustainable, and I argue that only a profound reimagining of sociopolitical relationships—those between the state, local and global civil society actors, and adventure travel practitioners and participants—will allow it to continue. A series of recent disasters in the mountains may serve as the necessary catalyst for previously underrepresented stakeholders to translate their growing assertiveness into meaningful and durable solutions.

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Senior thesis written for Oceanography 445

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Thesis (Ph.D.)--University of Washington, 2016-06

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Sequence diversity in the coat protein coding region of Australian strains of Johnsongrass mosaic virus (JGMV) was investigated. Field isolates were sampled during a seven year period from Johnsongrass, sorghum and corn across the northern grain growing region. The 23 isolates were found to have greater than 94% nucleotide and amino acid sequence identity. The Australian isolates and two strains from the U.S.A. had about 90% nucleotide sequence identity and were between 19 and 30% different in the N-terminus of the coat protein. Two amino acid residues were found in the core region of the coat protein in isolates obtained from sorghum having the Krish gene for JGMV resistance that differed from those found in isolates from other hosts which did not have this single dominant resistance gene. These amino acid changes may have been responsible for overcoming the resistance conferred by the Krish gene for JGMV resistance in sorghum. The identification of these variable regions was essential for the development of durable pathogen-derived resistance to JGMV in sorghum.

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Sunflower rust caused by Puccinia helianthi is the most important disease of sunflower in Australia with the potential to cause significant yield losses in susceptible hybrids. Rapid and frequent virulence changes in the rust fungus population limit the effective lifespan of commercial cultivars and impose constant pressure on breeding programs to identify and deploy new sources of resistance. This paper contains a synopsis of virulence data accumulated over 25 years, and more recent studies of genotypic diversity and sexual recombination. We have used this synopsis, generated from both published and unpublished data, to propose the origin, evolution and distribution of new pathotypes of P. helianthi. Virulence surveys revealed that diverse pathotypes of P. helianthi evolve in wild sunflower populations, most likely because sexual recombination and subsequent selection of recombinant pathotypes occurs there. Wild sunflower populations provide a continuum of genetically heterogeneous hosts on which P. helianthi can potentially complete its sexual cycle under suitable environmental conditions. Population genetics analysis of a worldwide collection of P. helianthi indicated that Australian isolates of the pathogen are more diverse than non-Australian isolates. Additionally, the presence of the same pathotype in different genotypic backgrounds supported evidence from virulence data that sexual recombination has occurred in the Australian population of P. helianthi at some time. A primary aim of the work described was to apply our knowledge of pathotype evolution to improve resistance in sunflower to sunflower rust. Molecular markers were identified for a number of previously uncharacterised sunflower rust R-genes. These markers have been used to detect resistance genes in breeding lines and wild sunflower germplasm. A number of virulence loci that do not recombine were identified in P. helianthi. The resistance gene combinations corresponding to these virulence loci are currently being introgressed with breeding lines to generate hybrids with durable resistance to sunflower rust.