Graduate Theses & Dissertations

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Relationships between Dissolved Organic Matter and Vanadium Speciation in the Churchill River, MB and the Mackenzie River Basin, NWT using diffusive gradients in thin films (DGT)
This study examines the influence of dissolved organic matter (DOM) on dissolved vanadium (V) speciation in the Churchill River and Great Slave Lake using diffusive gradients in thin film (DGT). Vanadium is commonly found in natural environments such as rivers, lakes and oceans. It regulates normal cell growth, but in excessive amounts, it can have toxic effects on human and aquatic organisms. The use of in situ, time integrated DGT devices allows to better (1) monitor the most bioavailable fraction of V, the DGT-labile V, in Arctic Rivers and (2) assess the influence of DOM on dissolved V speciation. Higher DGT-labile V was found in the the central regions of the Mackenzie River (MR), with an average of 7.7 ± 2.3 nM, likely due to sediment leaching and permafrost thawing. The Churchill River and Great Slave Lake (GSL) showed lower DGT-labile V levels (2.2 ± 1.6 nM and 3.6 ± 2.7 nM, respectively), compared to central regions in MR. The CR DGT-labile V concentrations was positively correlated to protein-like DOM concentration and abundance (r = 0.3, p < 0.05). The data collected from this study will help in developing new strategies regarding environmental health and impact assessments of environmentally hazardous waste that consist of potentially high levels of toxic vanadium species. Developments in the use of DGT devices as a sampling method will also aid in future studies involved in analyzing environmental health and specifically dissolved V species in natural waters. Author Keywords: diffusive gradients in thin-films, dissolved organic matter, fluorescence, mass spectrometry, UV-Vis, vanadium
Conservation genetics of Redside Dace (Clinostomus elongatus)
Recent range reductions of endangered species have been linked to urban development, increased agricultural activities, and introduction of non-native species. I used Redside Dace (Clinostomus elongatus) as a focal species to examine the utility of novel monitoring approaches, and to understand historical and contemporary processes that have influenced their present distribution. I tested the efficacy of environmental DNA (eDNA) to detect Redside Dace, and showed that eDNA was more sensitive for detecting species presence than traditional electrofishing. Parameters such as season, number of replicates, and spatial versus temporal sampling need to be accounted for when designing an eDNA monitoring program, as they influence detection effectiveness and power. I also assessed the species’ phylogeographic structure using both mitochondrial and microsatellite DNA analysis. The data from the microsatellite markers indicate that Redside Dace populations are genetically structured, with the exception of several populations from the Allegheny River basin. Combined sequence data from three mitochondrial genes (cytochrome b, ATPase 6 and ATPase 8) indicated that Redside Dace persisted within three Mississippian refugia during the last glaciation. Secondary contact between two lineages was indicated by both mitochondrial and microsatellite data. The combined results from the eDNA and conservation genetics studies can be used to inform Redside Dace recovery efforts, and provide a template for similar efforts for other aquatic endangered species. Author Keywords: eDNA, endangered, genetics, phylogeography
Modeling drought derivatives in arid regions
We propose a stochastic weather model based on temperature, precipitation, humidity and wind speed for Qatar, as a representative arid region, in order to obtain simulated values for a drought index. As a drought index, the Reconnaissance Drought Index (RDI) is commonly accepted in agriculture and is used to measure drought severity. It can be used to price weather derivatives to help farmers reduce nancial losses from drought. RDI, which is the ratio of precipitation to evapotranspiration, is calculated by considering crop growth stages. The use of dierent crop coecient value depending on the growth stage to calculate evapotranspiration can provide improved values for RDI. Additionally, six calculation methods for evapotranspiration using weather data are investigated to obtain accurate values for RDI. Author Keywords: Evapotranspiration, Markov chains, Mean reversion processes, Reconnaissance Drought Index, Stochastic dierential equations, Stochastic weather models
Social thermoregulation and potential for heterothermy
Northern and southern flying squirrels (Glaucomys sabrinus and G. volans, respectively) are experiencing a climate change induced increase in range overlap, resulting in recent hybridization. We investigated the occurrence of heterospecific communal nesting, a potential facilitator of hybridization, and aimed to confirm the presence of torpor, a potential barrier to hybridization, in flying squirrels. In wild-caught captive squirrels, we conducted a paired nest choice experiment and found that heterospecific nesting did occur, but in a lower frequency than conspecific nesting. Ambient temperature did not affect the frequency of grouped nesting. We attempted to induce torpor in flying squirrels in a laboratory through cold exposure while measuring metabolic rate and body temperature. Strong evidence of torpor was not observed, and metabolic rate remained unchanged with season. We conclude that torpor is not a barrier to hybridization in flying squirrels, but resistance to heterospecific nesting may indicate the existence of one. Author Keywords: heterospecific group, hybridization, northern flying squirrel, social thermoregulation, southern flying squirrel, torpor
Becoming Hybrid
Institutional military strategists are developing theories of asymmetric and unconventional warfare that complicate the notion of strategic agency, the idea that military action emanates from a coherent agential source or subjectivity. This thesis attempts to push the conceptual trajectories of the theories of Hybrid War, Unrestricted War and Onto-power towards an even more radical complication of the notion of strategy - towards an ecological understanding of war as an unwinnable, self-perpetuating process. Recent geopolitical events are meticulously examined, as are institutional doctrinal and theoretical frameworks that stop just short of imploding the conventional agential notion of strategy. Insights from the work of Gilles Deleuze and Felix Guattari, as well as Brian Massumi, particularly the concepts of multiplicity, assemblage, and ontopower, are employed in the thesis, which is itself a “heterogeneous assemblage” of elements ranging from Israeli war theory and Chinese military doctrine to etymology and post-structuralist philosophy. Author Keywords: Agency, Assemblage, Deleuze, Hybrid warfare, Multiplicity, Strategy
While the Lonely Mingle with Circumstance
Emmanuel Levinas’ philosophy focuses on the idea that no human subject exists outside of their relationship to other people. Each of us holds a profound degree of responsibility to and for all others. Since responsibility is fundamental to human (co)existence, it does not impede on freedom but proves that the sovereign individual is a dangerous myth: any philosophical, political or economic system which places us in antagonism is inherently violent and arguably fallacious. Many instances of injustice and violence can be attributed to advances in technological rationality and other forces of modern egoism with historical roots. By forwarding a somewhat politicized interpretation of Totality and Infinity and drawing on Jacques Derrida’s landmark reading of Levinas, this thesis explores the implications of Levinas’ thought for modern politics and the potential of Levinasian ethics as a remedy for both the alienation of the modern subject and the continued justification of oppression. Author Keywords: Ethics, Levinas, Other, Relation, Responsibility, Subjectivity
Spatial Bestiary
In my Master’s thesis, I consider how the space of the animal laboratory shapes human-animal relationships, and how, in turn, these relations impact the laboratory, and more specifically, the spatially-bound practices that unfold in this space. I use the frameworks of biopolitics and animal geography, both of which help in illuminating the space of the lab as a site of power, within which human-animal agency becomes exercised. Alongside these analytics, I conducted participant interviews with individuals who work with animals in laboratories or settings similar to laboratories, which animate several themes that I locate at the intersection of biopolitics and animal geography. These themes include a discussion of human-animal relations of power, scientific biopower and scientific market economies, the animal-industrial complex, and the relationship between human binaries and their effects on spatiality. This project is as much about animal lives as it is about human lives. Author Keywords: agency, animal geography, biopower, human-animal relationships, spatiality, the animal laboratory
Materiality and Ontology of Digital Subjectivity
New conditions of materiality are emerging from fundamental changes in our ontological order. Digital subjectivity represents an emergent mode of subjectivity that is the effect of a more profound ontological drift that has taken place, and this bears significant repercussions for the practice and understanding of the political. This thesis pivots around mathematician Grigori ‘Grisha’ Perelman, most famous for his refusal to accept numerous prestigious prizes resulting from his proof of the Poincaré conjecture. The thesis shows the Perelman affair to be a fascinating instance of the rise of digital subjectivity as it strives to actualize a new hegemonic order. By tracing first the production of aesthetic works that represent Grigori Perelman in legacy media, the thesis demonstrates that there is a cultural imperative to represent Perelman as an abject figure. Additionally, his peculiar abjection is seen to arise from a challenge to the order of materiality defended by those with a vested interest in maintaining the stability of a hegemony identified with the normative regulatory power of the heteronormative matrix sustaining social relations in late capitalism. The first chapter analyses the formal aesthetics of legacy media representations of Perelman. The second chapter focuses on new media aesthetic productions pertaining to Perelman and the political ontology of digital media. The third chapter interrogates the political ontology of the materials utilized in Perelman’s work and seeks to clarify the status of the conditions of the challenge of a digital hegemony. Author Keywords: abjection, archive, autistic reason, digital subjectivity, Grigori Perelman, ontological drift
Characterisation of the Giardia Tata-Binding Protein - Preparation for an in vivo approach
The aim of this work was to identify the DNA sequences recognized by the Giardia TBP (gTBP) in vivo by using a chromatin immunoprecipitation assay (ChIP). Since a specific antibody for the protein of interest is required for this assay, a company was contracted to produce and purify a custom polyclonal antibody from the immunization of rabbits. Recombinant GST-gTBP was produced at a suitable yield and purity and used as the immunogen. The antibody was then tested for reactivity to the native protein in our laboratory. By Western blot analysis, it was possible to observe the enrichment of the gTBP within the nuclear fraction compared to a cytoplasmic fraction extracted from Giardia cells. However, the antibody could not be successfully used in an immunoprecipitation assay - suggesting that the antibody is unable to bind to the native structure of gTBP. Therefore, the focus of this work was changed to analyse gTBP via multiple sequence alignments, homology modelling and BLAST to identify any unique regions that may contribute to its unusual binding characteristics. These techniques were also used to identify specific regions of gTBP that may be used to generate synthetic peptides as immunogens for future antibody production. Author Keywords: ChIP, Giardia intestinalis, Homology modelling, Immunoprecipitation, TATA-binding protein, Western Blotting
Dennis Lee's Testament
The future-poetry of Dennis Lee published in Testament (2012) is the culmination of four cycles of creativity in his lifetime, each seeking a Real beyond the nihilism of technological modernity. Ultimately, Lee wagers the role of the poet and the future of poetic language on Earth on a non-modern that risks entangling the poet who enters void and embodies its meaninglessness. CHAPTER ONE: To approach this wager, the thesis first identifies the sources in philosophy of a Canadian Romantic modernism embraced by George Grant in collegial exchanges with Dennis Lee during the period of Civil Elegies (1972). Grant elicits a politics out of Nietzsche; Lee extends a poetics out of classical experimental modernism, made intelligible in this thesis by Mallarmé’s “cadence” or “rhythm” of things in nothingness and by Beckett’s word-play at the impasse of naming. CHAPTER TWO: To think beyond the mastery of the world by technique is to encounter a choice between silence as assumed by Grant and nonsense as explored by Lee during the period of Alligator Pie (1974) and The Gods (1979). CHAPTER THREE: The example of Paul Celan and his revisiting of Hölderlin provokes Lee to attend upon cadence at the level of the discrete word, an experiment with the dissolution of language and selfhood anticipated in the period of Riffs (1993) and Nightwatch (1996). Here, the undermusic felt to belong to the life-world (Lebenswelt) impacts as affect, in contrast to Celan’s alienated death-walk. CHAPTER FOUR: In the spirit of “post-internet poetry,” and by means of the spontaneous polyphonic scoring of cadence, Lee transforms the modernist impasse at the void into a further contradiction, the living of which may allow the poet access to a non-modern, but at a cost: the loss of poetry to incomprehension and insignificance, the reduction of the poet to a medium of the void, the dissolving of structure into materialities colliding in chance. Author Keywords: Dennis Lee, George Grant, Nonsense, Paul Celan, Technological Modernity, Void
Phosphorus deposition in forested watersheds
Phosphorus (P) is an essential macronutrient. In south-central Ontario, foliar P concentrations are low and studies have suggested that P may be limiting forest productivity. Current catchment mass balance estimates however, indicate that P is being retained suggesting that P should not be limiting to tree growth. Phosphorus deposition is measured using bulk deposition collectors, which are continuously open and therefore are subject to contamination by pollen and other biotic material with high P and potassium (K) concentrations and may therefore overestimate net P inputs to forested catchments. Average annual TP and K deposition at three long-term (1984 – 2013) monitoring sites near Dorset, Ontario ranged from 15 to 20 mg·m-2y-1 and 63 to 85 mg·m-2y-1, respectively, and was higher at Paint Lake compared with Plastic Lake and Heney Lake. Phosphorus and K in bulk precipitation were strongly positively correlated, but deposition patterns varied spatially and temporally among the three sites. Total phosphorus and K deposition increased significantly at Plastic Lake and decreased significantly at Paint Lake, but there was no significant trend in TP or K deposition at Heney Lake over the 30 year period. All sites, but especially Paint Lake, exhibited considerable inter-annual variation in TP and K deposition. To quantify the contribution of pollen, which represents an internal source of atmospheric P deposition, Durham pollen collectors during the spring and summer of 2014 were used. The three sites, Paint Lake, Heney Lake, and Plastic Lake had pollen deposition amounts of 5202 grains·cm-2, 7415 grains·cm-2, and 12 250 grains·cm-2, respectively in 2014. Approximately 83% of pollen deposition can be attributed to white pine and red pine that has a concentration of 3 mg·g-1 of P. It was estimated that pollen alone could account for up to one-third of annual bulk P deposition. Extrapolating winter P deposition values to exclude all potential biotic influences (insects, bird feces, leaves), indicates that bulk deposition estimates may double actual net P to forests, which has implications for long-term P availability, especially in harvested sites. Author Keywords: Atmospheric Deposition, Phosphorus, Pine, Pollen, Potassium, South-Central Ontario
Denizens of Virtual Worlds
This thesis studies a subset of players of video games called “power-gamers” who play games in a way that mirrors labour as opposed to leisure. Through ethnographic fieldwork and exploration this thesis examines what constitutes “power-gaming” and seeks to unpack the differences between skill, fun, and labour. Chapter One analyzes how ethnographic fieldwork is performed in virtual worlds, and the necessary frameworks inherent to this. Chapter Two explores facets of technical hobbies, masculinity, skill, and how they relate to power-gaming. Chapter Three explores how different cultures globally choose to play-games, and the forms of sociability involved in this play. Chapter Four examines reality in relation to virtual worlds, and how players in virtual worlds explore and unpack their surroundings, which mirrors many scientific practices in the real world. Chapter Five explores narrative structure in games, and their relation to power-gaming practices. Chapter Six concludes with a discussion of power-gamers as a neo-liberal workforce. Author Keywords: game design, neo-liberalism, playbour, power-gamer, sociability, virtual-ethnography

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Format: 2024/02/20