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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Chroniese moegheidsindroom : 'n ekosistemiese perspektief

Morgan, Leona 06 1900 (has links)
Hierdie studie is 'n kwalitatiewe ekosistemiese ondersoek van die fenomeen Chroniese Moegheidsindroom (CMS) . Die paradigmaverskuiwing vanaf die Cartesiaans-Newtoniaanse epistemologie na die kubernetiese epistemologie, het 'n aantal belangrike implikasies vir die bestudering en konseptualisering van CMS, soos uiteengesit in hierdie studie. 'n Bespreking van die konseptualisering en behandeling van CMS vanuit die tradisionele, reduksionistiese navorsing word verskaf. Die aannames van twee-orde kubernetika en sosiale konstruksionisme, is bespreek en toegepas op die beskrywing van twee sisteme waarin CMS voorkom. Die navorsingsmetodologie van die studie is gegenereer op grand van die genoemde teoretiese aannames. Die implikasies van die toepassing van die ekosistemiese epistemologie vir die konseptualisering van CMS word uitgewys. Die herkonseptualisering van CMS as 'n transisieproses word bespreek en riglyne vir verdere navorsing en psigoterapie word aangedui. Die huidige studie bied 'n beskrywing van die unieke betekenisse en oplossings wat gesinne genereer tydens die veranderings wat CMS vergesel. / The present study is a qualitative ecosystemic exploration of the phenomenon known as chronic fatigue syndrome (CFS). The paradigm shift from the Newtonian epistemology to the epistemology of cybernetics, has important implication for research and the conceptualisation of CFS, as indicated in the study. The traditional, reductionist conceptualisation of CFS in research and treatment methods, is discussed. The suppositions of second order cybernetics and social constructionism, are discussed and applied in the description of two systems where CFS occurs. The research methodology of the present study is generated from the theoretical suppositions. Die implications of the use of the ecosystemic epistemology for the conceptualisation of CFS are indicated. The re-conceptualisation of CFS as a transition process is discussed and guidelines are given for future research and psychotherapy. The present study is a description of the unique meanings and solutions that the families generated during the changes that accompany CFS. / Psychology / M.A. (Kliniese Sielkunde)
12

Psychosocial support provided by teachers to adolescent learners with behavioural and emotional problems

Babedi, Mmamore Rebecca January 2013 (has links)
The purpose of this study was to explore and describe how teachers implement school-based psychosocial support to Grade 12 learners who have behavioural and emotional problems. As a secondary school teacher herself, the researcher frequently interacts with Grade 12 learners who have behavioural and emotional problems. Occurrences of behavioural and emotional problems are on the increase. This inference is based on the large number of reported learner problems in the School-based Support Team (SBST) records of a secondary school. The behavioural and emotional problems reported included violent aggressive behaviour, sexual and substance dependency, teenage pregnancy, early school drop-out and truancy. Learner problems may be caused by a variety of factors emanating from unmet development needs (Mwawenda, 2003), as well as biological factors and family and /or school factors (Papalia, Olds and Feldman, 2008). Kapp (2003), on the other hand, is of the opinion that a conducive environment may reduce learner problems and enhance improved learner wellbeing. This study forms part of the Regional Psychosocial Support Initiative (REPSSI) introduced to certain secondary schools in 2008. Ten teachers, who were part of the school-based team of the secondary school researched, participated in this initiative. REPPSI’s initial objective was to provide psychosocial support to children orphaned by HIV/Aids in South African Development Countries (SADC). The initiative focused on taking care of children’s developmental needs– social, emotional, behavioural, physical and spiritual. In the case of the school researched, this study was a pilot project to use REPPSI guidelines to provide psychosocial support to learners who have behavioural and emotional problems in participating schools. The study investigates how teachers implement psychosocial support based on the REPSSI Initiative. The study further explores how an ecosystemic approach can be used as an alternative approach to enhance the implementation of psychosocial services provided to learners. The study anticipates that an alternative approach will improve the school-based psychosocial initiative for adolescent learners who have behavioural and emotional problems in schools. The researcher used a constructivist paradigm to describe the school-based psychosocial support provided to adolescent learners who have behavioural and emotional problems. A case study design with 10 teachers in the school-based support team was selected. The participant teachers were conveniently and purposefully selected from REPSSI trained teachers. A focus group was used to facilitate semi-structured interviews. Ten participants shared their common perceptions and concerns (De Vos, Strydom Fouche’ and Delport, 2006) in a fairly short period (two sessions of one and half hours duration with teachers). Observations, photographs, reflective notes and field notes were used to gather information. A thematic content analysis of data was used to interpret data. To ensure rigour, it was verified with participants that they agreed with the results of the data analysis process. Debriefing meetings were also held with the researcher’s supervisor. The results of this study showed that teachers view need the pre and in-service training in ecosystemic approach to reduce behavioural and emotional problems of learners important. The results reveal that the use of ecosystemic approach by teachers and all role players in the adolescent learner’s life may enhance the effectiveness of school-based psychosocial support. / Inclusive Education / M. Ed. (Inclusive Education)
13

Chroniese moegheidsindroom : 'n ekosistemiese perspektief

Morgan, Leona 06 1900 (has links)
Hierdie studie is 'n kwalitatiewe ekosistemiese ondersoek van die fenomeen Chroniese Moegheidsindroom (CMS) . Die paradigmaverskuiwing vanaf die Cartesiaans-Newtoniaanse epistemologie na die kubernetiese epistemologie, het 'n aantal belangrike implikasies vir die bestudering en konseptualisering van CMS, soos uiteengesit in hierdie studie. 'n Bespreking van die konseptualisering en behandeling van CMS vanuit die tradisionele, reduksionistiese navorsing word verskaf. Die aannames van twee-orde kubernetika en sosiale konstruksionisme, is bespreek en toegepas op die beskrywing van twee sisteme waarin CMS voorkom. Die navorsingsmetodologie van die studie is gegenereer op grand van die genoemde teoretiese aannames. Die implikasies van die toepassing van die ekosistemiese epistemologie vir die konseptualisering van CMS word uitgewys. Die herkonseptualisering van CMS as 'n transisieproses word bespreek en riglyne vir verdere navorsing en psigoterapie word aangedui. Die huidige studie bied 'n beskrywing van die unieke betekenisse en oplossings wat gesinne genereer tydens die veranderings wat CMS vergesel. / The present study is a qualitative ecosystemic exploration of the phenomenon known as chronic fatigue syndrome (CFS). The paradigm shift from the Newtonian epistemology to the epistemology of cybernetics, has important implication for research and the conceptualisation of CFS, as indicated in the study. The traditional, reductionist conceptualisation of CFS in research and treatment methods, is discussed. The suppositions of second order cybernetics and social constructionism, are discussed and applied in the description of two systems where CFS occurs. The research methodology of the present study is generated from the theoretical suppositions. Die implications of the use of the ecosystemic epistemology for the conceptualisation of CFS are indicated. The re-conceptualisation of CFS as a transition process is discussed and guidelines are given for future research and psychotherapy. The present study is a description of the unique meanings and solutions that the families generated during the changes that accompany CFS. / Psychology / M.A. (Kliniese Sielkunde)
14

'n Ekosistemiese herbeskouing van pleegsorgdienste

Diederiks, Amanda Magrietha 01 1900 (has links)
Text in Afrikaans / In die studie word die ontwikkelingspad van 'n Newtoniaanse benadering na 'n ekosistemiese benadering in die denke van die navorser en lewering van pleegsorgdienste deur die maatskaplike werker/navorser, beskryf. In die beskrywing is gefokus op drie beginsels elk van die Newtoniaanse - en die ekosistemiese benaderings. Die gekose beginsels is met 'n gevallestudie geillustreer. Aan die ha d van die beginsels van die ekosistemiese benadering word 'n konsepsuele raamwerk gebied waardeur die outonomie van mense en sisteme in stand gehou en gebruik kan word. Volgens tweede orde kubernetika, is die studie die konstruksie van die navorser. Pleegsorg is 'n komplekse alternatiewe versorgingsposisie vir 'n kind en die lewering van begeleidingsdienste stel besondere eise aan die professionele persone betrokke. Hierdie studie suggereer dat pleegsorgdienste wat aan die hand van die ekosistemiese benadering gelewer word, 'n konstruksie van gedeelde verantwoordelikheid tussen al die betrokke partye voorstel. / Social Work / M. A. (Social Science: Mental Health)
15

Absent fathers : an ecosystemic exploration of context

Mabusela, Moipone Hilda Martha 09 1900 (has links)
The aim of this study was to explore absent fathers' experiences. This involved determining absent fathers' conceptualisation of fatherhood, exploring the psychological well-being of absent fathers, and how absent fathers cope with being absent from their children‟s lives. An ecosystemic approach was employed as the epistemology to understand the participants in terms of organisation of their behaviour in social contexts. Qualitative research was used, and in-depth interviews were conducted to collect the data. The research found that these fathers' experiences of being absent from their children's lives have negatively affected several aspects of their lives, both emotionally and behaviourally. Furthermore, the study concluded that fathers who are absent from their children‟s lives, while aware of the roles they need to play, seem unable to fulfil these roles. Lastly, the absent fathers revealed a tendency to react ambivalently towards their identities as fathers. / Psychology / M.A. (Clinical Psychology)
16

Guidelines towards an ecosystemic support programme for HIV and AIDS orphans in the Fezile Dabi region / Mookho Emily Dhlamini

Dhlamini, Mookho Emily January 2011 (has links)
In the absence of support programmes for HIV and Aids orphans in the Fezile Dabi Region this research set out to design guidelines towards an ecosystemic support programme to support HIV and Aids orphans in the Fezile Dabi Region. The literature review revealed that HIV and Aids orphans experience a wide range of support needs. Their psychosocial needs impair normal development due to unhappiness, stress, stigma, discrimination and a lack of care, love and support. In addition to this, emotional needs, which emanate from a lack of security and safety manifest in sadness, disruptive behaviour, poor relationships, poor self-image and isolation. Socio-economic needs expose them to poverty and being vulnerable to child labour with little reward, and deprive them of opportunities to obtain a proper education. All the above-mentioned problems lead to educational needs that manifest in poor school attendance, poor concentration, learning breakdown and dropping out of school. In addition to this, physical needs that stem from malnutrition caused by poverty and a low standard of living have an impact on the physical growth and health of the HIV and Aids orphans. In order to find out whether the abovementioned discussion holds true for HIV and Aids orphans in the Fezile Dabi Region, qualitative, phenomenological research by means of structured individual interviews was conducted with a convenient and purposive sample of 43 Black HIV and Aids orphans in the Fezile Dabi Region. The focus of the interviews was to gain a better understanding of the support needs that these learners experience due to HIV and Aids, and to explore how they are supported in dealing with these needs. The empirical research revealed that the HIV and Aids orphans in the Fezile Dabi Region who took part in my study experience psychosocial, emotional, socio-economic, educational and physical needs. Many of the needs, in the absence of strong community-based support in the region, are not supported adequately. Despite the identified needs, the data revealed strong tenets of resilience among the participants who took part in the study. In contrast to the literature, the findings of my study revealed that a number of the HIV and Aids orphans in the Fezile Dabi Region apparently manage to establish good social relationships that help them cope with their problems. Furthermore, they aspire to obtain a good quality education and have ambitions and goals in terms of their future careers that they would like to achieve. Based on the literature review and the interview data, guidelines towards an ecosystemic support programme for the HIV and Aids orphaned learners in the Fezile Dabi Region were designed. / PhD, Learner support, North-West University, Vaal Triangle Campus, 2012
17

Absent fathers : an ecosystemic exploration of context

Mabusela, Moipone Hilda Martha 09 1900 (has links)
The aim of this study was to explore absent fathers' experiences. This involved determining absent fathers' conceptualisation of fatherhood, exploring the psychological well-being of absent fathers, and how absent fathers cope with being absent from their children‟s lives. An ecosystemic approach was employed as the epistemology to understand the participants in terms of organisation of their behaviour in social contexts. Qualitative research was used, and in-depth interviews were conducted to collect the data. The research found that these fathers' experiences of being absent from their children's lives have negatively affected several aspects of their lives, both emotionally and behaviourally. Furthermore, the study concluded that fathers who are absent from their children‟s lives, while aware of the roles they need to play, seem unable to fulfil these roles. Lastly, the absent fathers revealed a tendency to react ambivalently towards their identities as fathers. / Psychology / M. A. (Clinical Psychology)
18

Guidelines towards an ecosystemic support programme for HIV and AIDS orphans in the Fezile Dabi region / Mookho Emily Dhlamini

Dhlamini, Mookho Emily January 2011 (has links)
In the absence of support programmes for HIV and Aids orphans in the Fezile Dabi Region this research set out to design guidelines towards an ecosystemic support programme to support HIV and Aids orphans in the Fezile Dabi Region. The literature review revealed that HIV and Aids orphans experience a wide range of support needs. Their psychosocial needs impair normal development due to unhappiness, stress, stigma, discrimination and a lack of care, love and support. In addition to this, emotional needs, which emanate from a lack of security and safety manifest in sadness, disruptive behaviour, poor relationships, poor self-image and isolation. Socio-economic needs expose them to poverty and being vulnerable to child labour with little reward, and deprive them of opportunities to obtain a proper education. All the above-mentioned problems lead to educational needs that manifest in poor school attendance, poor concentration, learning breakdown and dropping out of school. In addition to this, physical needs that stem from malnutrition caused by poverty and a low standard of living have an impact on the physical growth and health of the HIV and Aids orphans. In order to find out whether the abovementioned discussion holds true for HIV and Aids orphans in the Fezile Dabi Region, qualitative, phenomenological research by means of structured individual interviews was conducted with a convenient and purposive sample of 43 Black HIV and Aids orphans in the Fezile Dabi Region. The focus of the interviews was to gain a better understanding of the support needs that these learners experience due to HIV and Aids, and to explore how they are supported in dealing with these needs. The empirical research revealed that the HIV and Aids orphans in the Fezile Dabi Region who took part in my study experience psychosocial, emotional, socio-economic, educational and physical needs. Many of the needs, in the absence of strong community-based support in the region, are not supported adequately. Despite the identified needs, the data revealed strong tenets of resilience among the participants who took part in the study. In contrast to the literature, the findings of my study revealed that a number of the HIV and Aids orphans in the Fezile Dabi Region apparently manage to establish good social relationships that help them cope with their problems. Furthermore, they aspire to obtain a good quality education and have ambitions and goals in terms of their future careers that they would like to achieve. Based on the literature review and the interview data, guidelines towards an ecosystemic support programme for the HIV and Aids orphaned learners in the Fezile Dabi Region were designed. / PhD, Learner support, North-West University, Vaal Triangle Campus, 2012
19

'n Ekosistemiese herbeskouing van pleegsorgdienste

Diederiks, Amanda Magrietha 01 1900 (has links)
Text in Afrikaans / In die studie word die ontwikkelingspad van 'n Newtoniaanse benadering na 'n ekosistemiese benadering in die denke van die navorser en lewering van pleegsorgdienste deur die maatskaplike werker/navorser, beskryf. In die beskrywing is gefokus op drie beginsels elk van die Newtoniaanse - en die ekosistemiese benaderings. Die gekose beginsels is met 'n gevallestudie geillustreer. Aan die ha d van die beginsels van die ekosistemiese benadering word 'n konsepsuele raamwerk gebied waardeur die outonomie van mense en sisteme in stand gehou en gebruik kan word. Volgens tweede orde kubernetika, is die studie die konstruksie van die navorser. Pleegsorg is 'n komplekse alternatiewe versorgingsposisie vir 'n kind en die lewering van begeleidingsdienste stel besondere eise aan die professionele persone betrokke. Hierdie studie suggereer dat pleegsorgdienste wat aan die hand van die ekosistemiese benadering gelewer word, 'n konstruksie van gedeelde verantwoordelikheid tussen al die betrokke partye voorstel. / Social Work / M. A. (Social Science: Mental Health)
20

Bioremédiation de sols en milieu nordique : des ressources locales pour traiter une variété d’hydrocarbures pétroliers et autres contaminants avec la phytoremédiation, la mycoremédiation et l’aide de matières résiduelles fertilisantes

Robichaud, Kawina 04 1900 (has links)
Les hydrocarbures pétroliers sont expédiés et utilisés dans pratiquement toutes les parties du monde et sont devenus l’un des contaminants parmi les plus communs et les plus répandus dans les sols. Les éléments traces sont parfois associés aux hydrocarbures, ce qui peut augmenter la toxicité d’un site, compliquer les voies possibles de remédiation, et augmenter les coûts de traitements traditionnels. Dans les régions nordiques, où des déversements sont recensés dans de nombreux sites, le temps de nettoyage des contaminants et les coûts des méthodes d’assainissement traditionnelles peuvent s’avérer considérablement plus élevés que dans les régions tempérées. Des recherches alternatives visant une remédiation plus rapide et moins coûteuse, adaptée à des climats subarctiques, sont nécessaires et l’utilisation de plantes et champignons indigènes à l’écosystème local sont des approches prometteuses. En parallèle, les gouvernements de multiples pays visent à réduire les émissions de gaz à effet de serre, notamment par la réduction des déchets putrescibles voués à l’enfouissement. En utilisant ces matières résiduelles fertilisantes obtenues localement dans le processus de décontamination, une opportunité se présente pour valoriser ces matières tout en décontaminant des sites. Cette recherche doctorale vise à développer des méthodes de bioremédiation adaptées aux conditions locales, avec des intrants indigènes aux régions d’étude, pour des sols contaminés aux HCP au sein de trois projets de recherche à grande échelle sur le terrain, dont un également contaminé aux éléments traces. Deux projets ont été effectués dans un climat subarctique au 60° parallèle (Whitehorse, Yukon), en utilisant une approche novatrice de phytoremédiation assistée de champignons et compost municipal; nous qualifions cette technique intégrée d’approche par « microsystème écologique ». Comme le volume de sol affecte beaucoup l’efficacité des méthodes de bioremédiation, des volumes considérables de 0.15 m3 et 1 m3 ont été utilisés (au premier et deuxième site, respectivement), pour maximiser la pertinence des résultats lors de transfert d’échelles futures. Au premier site, l’efficacité des différentes composantes du microsystème a été évaluée en bacs dans quatre différentes combinaisons et comparée au traitement de base habituel (fertilisant) dans un sol contaminé par un déversement accidentel de diésel. La plante choisie était le saule Salix planifolia et le champignon Pleurotus ostreatus. Les résultats indiquent qu’après une saison de traitement, le microsystème était le traitement avec le taux d’élimination du diésel le plus rapide. Après trois saisons, les traitements contenant un ou plusieurs éléments du microsystème avaient des taux de contamination sous les normes pour des sols agricoles et étaient plus efficaces que le traitement au fertilisant ou que l’atténuation naturelle. Le deuxième site était une fosse à huiles usées située sur une pile de stériles miniers au cœur d’un ancien dépotoir. Le microsystème a été implanté dans des cellules au sol avec une doublure à l’épreuve du lessivât de contaminants. Les saules Salix alaxensis et Salix planifolia furent utilisés en combinaison avec le champignon Trametes versicolor. Cette approche, dans un sol hautement contaminé, a réussi à diminuer de façon considérable les hydrocarbures pétroliers (plus de 65 à 75 %). Le potentiel d’accumulation des métaux dans les tissus aériens des plantes a également été mesuré. Les deux espèces de saules ont démontré des taux d’accumulation d’éléments traces distincts et des stratégies racinaires différentes. Un champignon de la famille des Psathyrellaceae fut observé pour la première fois sur un site si hautement contaminé, puis est apparu de façon récurrente sur les cellules du microsystème pendant quatre ans. Les deux premiers sites répondent à un besoin de développer des méthodes de bioremédiation efficaces, passives et applicables en climat subarctique. Le troisième site de recherche porte sur l’utilisation de deux matières résiduelles fertilisantes (bois raméal fragmenté et drêche) et de fumier pour la dégradation de l’huile à moteur dans un climat continental humide à une latitude moyenne (Neuville, Québec). Des mésocosmes de 0.76 m3 avec aération contrôlée furent utilisés. L’utilisation de bois raméal fragmenté et de drêche de brassage à cette échelle, de même que l’acquisition des matières résiduelles dans un rayon très rapproché du centre de traitement afin d’explorer une approche d’économie circulaire dans un tel contexte, constituent les volets novateurs de cette étude. Les résultats démontrent que le fumier est plus efficace que le traitement habituel au fertilisant. La drêche de brassage et le bois raméal fragmenté sont utiles pour conserver l’humidité dans les sols (un paramètre de bioremédiation important). Cette étude, menée en collaboration avec un partenaire industriel, s’intègre dans la politique canadienne et québécoise de réductions des gaz à effets de serre et la philosophie de l’économie circulaire en valorisant des matières organiques résiduelles locales. Cette thèse a permis de démontrer qu’une combinaison de stratégies de bioremédiation avec des composantes locales est une méthode efficace dans un climat subarctique. Deux nouvelles espèces de saules (Salix planifolia et Salix alaxensis) ont été utilisées avec succès pour la bioremédiation d’hydrocarbures pétroliers et pour l’accumulation de certains éléments traces. Lors d’une collaboration avec un partenaire industriel, il a été possible de démontrer l’applicabilité de certains concepts d’économie circulaire et d’approche écosystémique en bioremédiation. / Petroleum hydrocarbons are shipped and used in virtually all parts of the world and have become one of the most common and widespread contaminants in soils. Trace elements are sometimes associated with them, and they can increase the toxicity of a site, complicate remediation, and increase the costs of traditional treatments. In northern areas where spills occur at multiple sites, the clean-up time and cost of traditional remediation methods can be significantly higher than in temperate regions. Alternative research aimed at faster and cheaper remediation adapted to subarctic climates is needed and the use of native plants and fungi integrated into the local ecosystem are promising approaches. Concurrently, governments in multiple countries aim to reduce greenhouse gas emissions, namely through the reduction of putrescible waste destined for landfills. By using locally-sourced residual fertilizing materials for decontamination processes, an opportunity arises to valorize these materials while restoring soils. This doctoral research aims to develop locally-adapted bioremediation methods, with indigenous plant and fungal inputs, to treat petroleum hydrocarbon contaminated soils in three large-scale field research projects, including one also contaminated with trace elements. Two projects were carried out in a subarctic climate at the 60 ° parallel (Whitehorse, Yukon), using an innovative approach of phytoremediation assisted by mushrooms and municipal compost; we call this integrated technique the "ecological microsystem" approach. Because soil volume has significant impacts on the efficiency of bioremediation methods, considerable volumes of 0.15 m3 and 1 m3 were used (at the first and second sites, respectively) to maximize the relevance of results in the event of a scale-up operation. At the first site, the effectiveness of the various components of the microsystem were evaluated in four different combinations, as well as compared to the usual basic treatment (fertilizer) in soil contaminated by an accidental diesel spill. The plant species chosen was Salix planifolia and Pleurotus ostreatus was selected for the fungus. Results indicate that after one treatment season, the microsystem was the treatment with the fastest diesel removal rates. After three seasons, treatments containing one or more elements of the microsystem were below standards for agricultural soils and were more effective than fertilizer treatment or natural attenuation. The second northern site was a waste oil pit located on top of a mine waste rock pile, at the heart of an old landfill. The microsystem was implanted into ground-level cells with a contaminant-proof leachate liner. The plant species Salix alaxensis and Salix planifolia were used in combination with the fungus Trametes versicolor. This approach in a highly contaminated soil was able to significantly reduce petroleum hydrocarbons (65 to 75%). The potential for metal accumulation in aerial plant tissues was also measured. Both willow species demonstrated distinct trace element accumulation patterns and different rooting strategies. A fungus of the Psathyrellaceae family was observed for the first time at a site so highly contaminated and was recurrent on the cells of the microsystem for 4 years. The first two sites contribute to the development of efficient and passive bioremediation methods applicable in subarctic climates. The third research site focused on the use of two residual fertilizing materials (fragmented rameal wood and brewer’s spent grain) and manure for the degradation of motor oil in a humid continental climate at a medium latitude (Neuville, Quebec). Mesocosms of 0.76 m3 with controlled aeration were used. Innovative aspects of this project include the use of rameal wood and spent grain at this scale, as well as the acquisition of residual materials in a very close radius of the treatment center to explore how a circular economy approach could apply in such a context. Results indicate that the addition of manure is more effective than the usual fertilizer treatment alone. Brewer’s spent grain and fragmented rameal wood were useful for maintaining soil moisture (an important bioremediation parameter) but did not increase degradation. This study, conducted in close collaboration with an industrial partner, falls under the objectives set by Canadian and Quebec policy on greenhouse gas reductions and circular economy approaches by working on the valorization of local residual organic matter. This thesis has demonstrated that combining strategies with local biological components is an effective bioremediation method in a subarctic climate. Two new willow species (Salix planifolia and Salix alaxensis) have been successfully used for the bioremediation of petroleum hydrocarbons and for the accumulation of certain trace elements. In collaboration with an industrial partner, it has been possible to demonstrate the applicability of certain circular economy concepts and the ecosystemic approach to bioremediation.

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