Digital Commons Network^™

Hydrogen Peroxide: A Grower’S Best Friend?, Mitchell Eicher-Sodo

Theses and Dissertations (Comprehensive)

Hydrogen peroxide (H₂O₂) is an oxidizing agent used to disinfect irrigation systems (e.g. nutrient solution and equipment) used in controlled environment plant production and produces no harmful by-products. The action of H₂O₂ is non-selective, and therefor H₂O₂ will oxidize all components of the irrigation water as well as tissues from the greenhouse crops being irrigated. The phytotoxic effect H₂O₂ has on common greenhouse crops is not well understood, requiring detailed characterization and determination of threshold concentrations. Thresholds within the thesis were based on applied H₂O …

Effects Of Phosphorus On Mycorrhizal Colonization Of Wetland Plants Under Natural And Controlled Conditions, Miriah Tucker

Theses and Dissertations (Comprehensive)

An important symbiotic relationship that forms in wetland environments occurs between plants and arbuscular mycorrhizal fungi (AMF). In terrestrial communities AMF colonization is limited by phosphorus; excessive phosphorus can lead to an uncoupling of the relationship. Few studies have examined the relationship between AMF and phosphorus concentration in wetland plants. The studies that have, found a decrease in AMF colonization at phosphorus concentrations as low as 0.03 mg/L P, however, methodological issues limit the interpretation of these results. To address this, a field and greenhouse study were completed using more realistic exposure conditions, field deployable assays (FDA), and natural intact …

Reducing Meat Consumption: Drawing On Participatory Action Research To Explore Ways Of Engaging In A Process Of Meat Consumption Reduction, Brittany Spadafore

Theses and Dissertations (Comprehensive)

With growing attention to climate change and human impacts on the environment, an emerging body of literature is exploring the impacts of global reliance on meat consumption. Research is increasingly supporting the feasibility of reducing meat consumption to address the environmental pressures of the global food system. However, recommended strategies to promote a reduction in meat consumption have been limited due to narrowly focusing on individual rational decision-making models. Centralizing a Social Practice theoretical lens, the present study utilized an approach to participatory action research to explore the experiences of seven (N = 7) green-building tenants reducing their meat consumption …

The Nature Of Informal Roles In Interdependent Sport Teams, Jeemin Kim

Theses and Dissertations (Comprehensive)

The degree to which athletes understand and execute their formal role responsibilities (i.e., prescribed by coaches) is important for individual and group functioning (Eys, Schinke, Surya, & Benson, 2014). Recent literature suggested that informal roles can emerge within sport teams more naturally without coaches’ explicit assignments (e.g., team comedians, distracters), and have significant influences on team functioning (Cope, Eys, Beauchamp, Schinke, & Bosselut, 2011). This doctoral dissertation examined the nature of informal roles within interdependent sport teams, focusing on their antecedents and outcomes. Three separate projects were conducted. Project One examined athletes’ personality in the big five dimensions (McCrae & …

Spinal Motor Neuron Excitability And Balance Control Changes Following Downslope Walking, Nikki Aitcheson-Huehn

Theses and Dissertations (Comprehensive)

Downslope walking (DSW) has been proposed as a rehabilitation tool for people with Multiple Sclerosis (PwMS) although there are mixed findings in young adults (YA) regarding the balance control changes, despite both populations experiencing depressed spinal motor neuron (MN) pool excitability. Our aim was to determine whether YAs could demonstrate improved balance control in conjunction with SOL H reflex depression (estimate of spinal MN excitability) following DSW. We also aimed to determine whether reciprocal inhibition was a potential mechanism for H reflex depression via conditioned SOL H reflexes. Thirty young adults (23±1.4y, 6 males) were assigned to 30-minutes of DSW …

Monitoring Environmental Change Using A Participatory Modified Photovoice Approach With Indigenous Knowledge Holders In Kakisa, Northwest Territories, Kaitlin Kok

Theses and Dissertations (Comprehensive)

In response to growing pressures from climate change and the lack of a monitoring strategy for food security at a local and regional level in the Northwest Territories, there is an urgency for residents to record their own images of change in relation to harvester safety. This thesis explores the connection between geographic information systems, sustainable food systems, indigenous knowledge and the importance of place. The objective of this study is two-fold: (a) to develop a monitoring system in conjunction with the community of Kakisa and (b) to increase the resilience of the local food system. The methods used derive …

An Evaluation Of The Timeline As A Memory Retrieval Aid For Children’S Recall Of Specific Details From A Repeated Event, Huan Huan Zhang

Theses and Dissertations (Comprehensive)

Investigators and prosecutors are heavily dependent on children’s testimony in abuse cases where physical evidence is often lacking, making children the sole source of information. Decades of research have shown that young children are indeed capable of accurately recalling events from the past. Findings from research on interview techniques suggest that interview aids such as dolls and human diagrams are often not helpful and pose risks of eliciting inaccurate reports unless they are used cautiously and non-suggestively at the end of the interview.

The timeline, which is a visual depiction of time, is another type of interview aid that is …

Fanm Pa Chita: Mobilities, Intimate Labour, And Political Subjectivities Among Haitian Women On The Move, Masaya Llavaneras Blanco

Theses and Dissertations (Comprehensive)

This dissertation asks: how does intimate labour interact with the mobility and political subjectivities of Haitian migrant women and women of Haitian descent in the Dominican Republic (DR)? It answers this question in three specific ways. First, it explains the relationship between intimate labour and the spatial trajectories of women of Haitian ancestry who work as domestic workers. Second, it examines how the interaction between intimate labour and human mobility plays out in the Dominican border regime. Third, it explains how these subaltern women act politically in the midst of the intersections between borders, mobilities, and intimacy.

The dissertation proposes …

A Genomic Investigation Of The Stomach Phenotype In Teleosts, Louis Pfeifer

Theses and Dissertations (Comprehensive)

The stomach, which is physiologically defined in vertebrates by its function in acid-peptic digestion, has been lost independently multiple times during the evolution of the teleost fishes. The function of the stomach is facilitated by the proton pump H⁺/K⁺-ATPase, which acidifies the stomach, and pepsinogens, which are converted to proteolytic pepsins in this acidic environment. It is well documented that in agastric (stomachless) fish, the genes what code for the expression of this proton pump (atp4a and atp4b) and the pepsinogens (pga, pgb, pgf, pgc and cym,) are absent from the genome …

Seeking A Path To Wellness And Flourishing: Exploring Ecological Citizenship, Systems Thinking, And Environmental Governance In Southwest Yukon, Amanda Solmes

Theses and Dissertations (Comprehensive)

While efforts toward environmental management (EM) have been increasing, the state of our natural world is getting worse. Numerous reports have outlined that today’s environmental problems are predominantly human-induced, yet approaches to EM often only address “environmental” rather than “human” issues. More holistic approaches are required. This thesis explores “ecological citizenship” (EC) as an alternative framework that may have the potential to address elements too often left out of top-down and reductionist approaches. Academic and case-based notions of this concept are explored, and a new definition for the term is developed. A case study, drawn from the rich results of …

(Subjective) Time Heals All Wounds: The Competing Roles Of Objective And Subjective Time In Reactions To Past Events, Sarah L. Williams

Theses and Dissertations (Comprehensive)

Although folk wisdom states that “time heals all wounds,” the truth of this claim is questionable and may be contingent on the nature of time in question. People think about and represent time in different ways: they consider how far away events (objectively) are, as well as how close or far away they (subjectively) feel. How close or distant a temporal event feels from the present is quite malleable and can be affected by a host of psychological factors independent of chronological time. However, little research has explicitly investigated the extent to which objective, calendar time, and one’s subjective sense …

Exploring Young Acb Women’S Experiences Of Navigating Sexual Health In The Greater Toronto Area., Natasha Afua Darko

Theses and Dissertations (Comprehensive)

This thesis explores the experiences of young African, Caribbean, and Black (ACB) women in the Greater Toronto Area (GTA) regarding how they navigate sexual health. Young ACB women face challenges that put them at increased risk for HIV and other sexually transmitted infections. Despite this, few studies have focused on the social contexts that affect sexual health for ACB women in Canada. This Community Based Participatory Research ( CBPR) study (N = 24) utilized focus groups to examine young ACB women's experiences navigating sexual health. In the following thesis document, I present two manuscripts where I share a) a reflection …

The Effects Of Dorsal Lateral Telencephalon Lesions On Zebrafish Social Behaviour, Hailey Katzman

Theses and Dissertations (Comprehensive)

Zebrafish are extremely social and aggregate in groups to form shoals. This social behaviour has been studied in the wild and in a laboratory setting, yet the mechanisms underlying the behaviour are unknown. There is evidence to suggest that the dorsal lateral telencephalon might play a role in shaping shoaling behaviour, being involved in modulating social behaviours and social reward associated with shoaling. In the current thesis, I adapted and combined several existing methods for performing lesions on the dorsal lateral telencephalon to create my own method to measure the role of the dorsal lateral telencephalon in social reward and …

Lgtbq+ Community Perceptions Of Police And Police Involvement In Pride Celebrations In A Small Ontario City: An Exploratory Study, Priscilla Ramjit

Theses and Dissertations (Comprehensive)

As literature and media findings suggest, the relationship between the LGTBQ+ community and the police is complex. This qualitative research study seeks to better understand the relationship between the Ruralcity LGTBQ+ community and the Ruralcity Police Service in a small city in southwestern Ontario—“Ruralcity”. Through the epistemological lens of symbolic interactionism and the critical approach of queer theory, I gathered the perspectives of five Ruralcity LGTBQ+ participants on the local police, including the kinds of interactions the participants have had with the police and how the police presence and absence at Ruralcity PRIDE events impact the participants’ sense of well-being. …

Abiotic Conditions, Algal Biomass & Fish Growth Rates Affect Fish Mercury Concentrations In Two Subarctic Lakes, Ari Yamaguchi

Theses and Dissertations (Comprehensive)

Kakisa Lake and Tathlina Lake, located in the Dehcho Region of the Northwest Territories, support important fisheries for the local Ka’a’gee Tu First Nation (KTFN). Recently, Walleye (Sander vitreus) of typical catch size in Tathlina Lake were found to have mercury concentrations above Health Canada’s commercial sale guideline of 0.5 ppm. Wild foods with elevated mercury concentrations can pose health risks to the humans who consume them, depending on consumption amounts and vulnerability factors such as age and pregnancy. Because wild fish can accumulate relatively high mercury levels and subsistence fishing contributes greatly to food security in northern …

“There’S No Manual For This”
: A Multi-Case Study Exploring Familial Experiences Of Maternal Incarceration, Lauren Hawthorne

Theses and Dissertations (Comprehensive)

Women are the fastest growing prison population in the world (ICPR, 2017). This holds true in the Canadian context, where 70% of federally incarcerated women are mothers to children under 18 (Sapers, 2015). Inevitably, the carceral experience is inherently familial: the experiences of criminalized women cannot be extricated from that of their families, and the experiences of children and caregivers cannot be extricated from that of the criminalized mother and other family members. Yet, there is a great deal that we do not know about incarceration and family life—particularly from the perspectives of caregivers, mothers, and children themselves. This multi-case …

Determination Of Samarium And Dysprosium Solubility, Seana Brennan

Theses and Dissertations (Comprehensive)

In recent years, the use of Rare Earth Elements (REE) has rapidly increased, resulting in numerous potential anthropogenic inputs to the environment. As a result, these metals are emerging as microcontaminants and pose a potential threat to aquatic life. However, the toxicity of REE are largely unknown due, in part, to the limited information on their chemical speciation. The purpose of this project was to gain an understanding of REE precipitate formation and solubility as the foundation for the development of the chemical equilibrium component of toxicity prediction models. Solubility experiments were conducted with Samarium, (Sm), a light REE, and …

Holy Estrangement: The Poetics Of Estrangement In John Donne's Divine Poems And Sermons, Anton Bergstrom

Theses and Dissertations (Comprehensive)

This dissertation examines literary estrangement, that is the act and effect of making the familiar strange in a literary work, in the religious poems and sermons of the poet-preacher John Donne (1572–1631). My study uncovers and explores what Donne "estranges," how he achieves this, and for what purpose, as well as the practices and modes of thinking that shaped his poetics. In Donne's religious verse and prose, making the familiar and traditional tropes, images, doctrines, and events of Christianity strange forms active readers and revitalizes those elements, imbuing them with newfound interest, significance, and affective power.

My study offers a …

Respectful Relationships: A Phenomenological Study On The Lived Experience Of Respect For Second-Generation Korean Canadian Pastors Within The Korean Church Context, Samuel Williams

Theses and Dissertations (Comprehensive)

This qualitative research explored the lived experience of respect for second-generation Korean Canadian pastors within the Korean Church context. In order to gain a deep understanding of the lived experience of respect, the hermeneutic phenomenological approach was used to collect the data and document the findings. All the twelve participants participated in an in-depth semi-structured interview which lasted 50-75 minutes. The transcribed participant interviews were analyzed for themes and sub-themes.

The following three themes emerged: why is respect expected within the Korean Church, when is respect expressed within the Korean Church, and how is respect experienced within the Korean Church. …

A Qualitative Investigation Into The Influence Of A Mental Health Physical Activity Intervention On University Students, Heather M. Tunks

Theses and Dissertations (Comprehensive)

Objective

Among the university student population, mental illnesses are highly prevalent. Adults aged 20-30 years have the highest rates of mood and anxiety disorders than any other age group, with approximately 12.0% diagnosed with an anxiety disorder and 7.0 to 9.0% experiencing clinical depression (Nunes et al., 2014; Pedrelli, Nyer, Yeung, Zulauf, & Wilens, 2015). Reducing or preventing the effects of mental illness among this population may have lifelong implications including improvements in coping and management of mental illness throughout the lifespan(Jaworska, DeSomma, Fonseka, Heck, & MacQueen, 2016). This research examines the lived experiences of volunteers and participants in a …

There Is No Free: An Indigenous Informed Perspective On Free, Prior And Informed Consent, Nicole Burns

Theses and Dissertations (Comprehensive)

Many Indigenous nations in Canada are faced with complex issues surrounding proposed development on their lands. There are numerous rights frameworks that support Indigenous Peoples’ inherent rights, which includes their right to free, prior and informed consent (FPIC) in relation to any development that would impact their lands. This case study examined the various perspectives of Matawa First Nations in regard to their experiences of consultation with government and industry. This study was conducted by performing document review and analysis of three focus groups (n=20), a video analysis of the APTN documentary series Ring of Fire and survey distribution and …

Structural And Functional Characterization Of Cazyme And Cazyme-Related Proteins From: Bacteroides Thetaiotaomicron And Porphyromonas Gingivalis: Two Abundant Colonizers Of The Human Microbiome, James Stevenson

Theses and Dissertations (Comprehensive)

The human body consists of approximately 30 trillion cells, while non-human microbes that reside on and within the body outnumber human somatic cells by a factor of 1.3 – 2.3. The interplay between our cells and those of the colonizing microorganisms affect physiology in a multitude of ways, both beneficial and detrimental. Microbes found in the oral cavity, such as the Red Complex member Porphyromonas gingivalis, are associated with pathology, namely periodontal diseases including gum deterioration, tooth decay, and loss of underlying alveolar bone. At the other end of the gastrointestinal tract, microbes such as Bacteroides thetaiotaomicron are found …

Influence Of Salinity On Copper-Ligand Formation Constants, Fatimah Barnawi

Theses and Dissertations (Comprehensive)

Natural Organic Matter (NOM) is known to reduce metal, such as copper, toxicity in aquatic environments. Copper is essential for organisms, but elevated concentrations of dissolved copper can potentially be toxic. The toxicity of copper is related to its bioavailability, which is influenced by toxicity modifying factors, such as NOM (quantified as Dissolved Organic Carbon (DOC) in mg C/L), alkalinity, pH and major cation and anion concentrations. The principles are the same for fresh and saltwater, but the influence of high salt concentrations, such as in estuaries, and associated activity corrections, can modify NOM complexation of metals (i.e., modify logK …

What Is It About Coda And Will? Exploring The Experiences Of School Social Workers Using Canine-Assisted Therapy In Their Clinical Practice With Students., Suzanne Mcdermid

Theses and Dissertations (Comprehensive)

This research project explores the experiences of school social workers partnering with trained, accredited facility dogs in an Ontario school board. A qualitative research methodology using an interpretative phenomenological analysis has been employed. Results reveal that organizational support is key to the successful integration of facility dogs in clinical social work practice within a school board. Environmental considerations allow for the establishment of therapeutic conditions that support positive interactions and interventions with a canine. Findings clarify three dimensions of canine-assisted therapy: connection, attunement and the handler-canine relationship. Connection is the ‘magic’ of canine-assisted therapy, the essence of an interaction between …

Characterizing The Hydrological Function Of Treed Bogs In The Zone Of Discontinuous Permafrost, Brenden Disher

Theses and Dissertations (Comprehensive)

The loss of permafrost has produced a wholesale conversion from forest to wetland, and many studies have analyzed the effects of permafrost thaw-induced land cover change on the hydrology and ecology of landscapes within the Taiga Plains. The permafrost thaw driven areal shrinkage of forested plateaux and their replacement by treeless wetlands is well documented, and the co-occurrence of permafrost and black spruce forest cover is the basis for areal estimates of the former. However, field studies conducted at a peatland dominated landscape near Fort Simpson, NWT indicate that tree canopy may persist following the loss of permafrost and the …

Be Kind To Your Mind: A Randomized Controlled Trial Comparing The Benefits Of Mindfulness And Self-Compassion Vs. Social Skills Training Among Children And Adolescents, Lindsey Feltis

Theses and Dissertations (Comprehensive)

Childhood and adolescence can be difficult for young people as they navigate a variety of significant transitions. Thus, it is imperative that researchers focus on programs that support children and adolescents during this time. Mindfulness and self-compassion are two such programs that may promote positive youth development. Mindfulness and self-compassion have been explored in the adolescent context, and mindfulness has been explored with young children, however research on self-compassion for children is currently lacking. The present studies were designed to examine the feasibility, acceptability and potential benefits of a combined mindfulness + self-compassion program for children and adolescents in the …

Impacts Of Transportation Infrastructure On Water Quality, Sediment Loads, And Fishing Opportunities In The Gwich’In Settlement Area, Northwest Territories, Matthew Teillet

Theses and Dissertations (Comprehensive)

The addition of gravel sediment to build ferry landings on the Peel and Mackenzie Rivers has been an ongoing concern for the Gwich’in communities of Fort McPherson and Tsiigehtchic that depend on the rivers for their livelihoods. Specifically, there are concerns that gravel from ferry landings is degrading water quality, harming fishing opportunities, and altering river morphology downstream. Previous reports concluded that ferry operations were not impacting downstream ecology. However, past studies had methodological shortcomings and community concerns about the ferry landings remain. To study the impact of the gravel landings on water quality, I utilized a multidisciplinary study design …

“This Is My Little World…”: Navigating The Group Exercise Experience Of Stay-Fit Members, Olivia Jones

Theses and Dissertations (Comprehensive)

Objective

Cancer is the leading cause of death in Canada, with one in two Canadians expected to develop cancer over their lifetime (Canadian Cancer Society, 2019). Exercise is reportedly a safe therapy to help ease the common side effects of cancer and its treatments (Schmitz et al., 2010). Past research has shown the benefits of group exercise while in treatment for cancer, but there is a dearth of research regarding the impact of long-term group exercise programming for cancer survivors. This phenomenological study explored the lived experiences of group exercise participation for individuals who previously had cancer and were enrolled …

Effects And Modes Of Action Of Exogenous Androgens On Gonadal Steroidogenesis In Male Mummichog (Fundulus Heteroclitus), Robert Rutherford

Theses and Dissertations (Comprehensive)

Androgens are a recognized class of endocrine disrupting compounds that are introduced into the aquatic environment through a variety of anthropogenic sources. Exogenous androgens can interact with the hypothalamus-pituitary-gonadal (HPG) axis in fish and alter its normal function, resulting in effects such as skewed sex ratios, intersex individuals, reduced fecundity, or altered mating behaviours. In fish, these apical effects are commonly correlated to depression of the terminal sex hormones testosterone, 17β-estradiol and 11-ketotestosterone (11KT). It is currently thought that the reduction in plasma sex hormones is an effect of negative feedback inhibition of steroid synthesis within the HPG axis after …

Narrating A Conscientization Journey On Crime Prevention Through Social Development, Carlos Luis Zatarain

Theses and Dissertations (Comprehensive)

There is an increasing interest among municipalities to address crime through prevention as social development (CPSD) that acknowledges the underlying social conditions that influence the occurrence of crime. This requires a critical consciousness among community members and decision-makers of the root causes of crime and critical action that reflect that understanding. This, in turn, implies both a significant mental and cultural shift requiring personal transformation. Only then can the appropriate actions towards a preventative approach to crime be effectively fostered. For this purpose, the Waterloo Region Crime Prevention Council developed a community course titled Reframing Crime, Justice, and Prevention that …