Digital Commons Network^™

Understanding Changes To Glacier And Ice Sheet Geometry: The Roles Of Climate And Ice Dynamics, Caitlyn Elizabeth Florentine

Graduate Student Theses, Dissertations, & Professional Papers

Glacier and ice sheet geometry depend on climatic and ice dynamic processes that are coupled and often highly complex. Thus, partitioning and understanding the drivers of change to glacier and ice sheet geometry requires creative approaches.

Radiostratigraphy data document emergent layers in the ablation zone of western Greenland that emulate theoretical englacial flow paths. Yet true alignment between radar layers and the englacial flow field can be uncertain because these structures have travelled hundreds of km from their original point of deposition, have been shaped by ice deformation for millennia, and have been subjected to complex and three-dimensional ice motion …

Wonder Woman: A Case Study For Critical Media Literacy, Adriana N. Fehrs

Graduate Student Theses, Dissertations, & Professional Papers

To better grasp the messages Wonder Woman is sending to its audience, a Critical Media Literacy (CML), ideological, and feminist framework is used to examine whether, and if so how, Wonder Woman succumbs to stereotypes that are often portrayed in the media. These theories will be used in the ensuing project to build a curriculum aimed at high school students.The curriculum positions students to examine the hegemonic ideologies that are represented in pop culture, specifically Wonder Woman.

Determination Of Lipid Bilayer Affinities For Small Molecules Using Capillary Electrophoresis And Copolymer – Stabilized Lipid Bilayer Nanodiscs, William Michael Penny

Graduate Student Theses, Dissertations, & Professional Papers

Electrokinetic chromatography is a variation of capillary electrophoresis that allows for the separation of nonionic analytes by selective interaction with an ionic pseudostationary phase dissolved in the background electrolyte. The utility of electrokinetic chromatography to characterize pseudostationary phases and pseudostationary phase–solute interactions has been recognized since its introduction. The objective of this dissertation was to use electrokinetic chromatography and copolymer stabilized lipid bilayer nanodiscs as a pseudostationary phase to characterize small molecule-lipid bilayer interactions.

Styrene-maleic acid copolymers were used to stabilize cylindrical sections of lipid bilayer in solution, forming nanodiscs. The nanodiscs are formed based on strong hydrophobic interactions between …

Greening Of The Arctic: Plot-Scale Analysis Of Interactions Between Climate, Vegetation, And Permafrost At Toolik Lake, Alaska (1995 - 2017), Brianna Rick

Graduate Student Theses, Dissertations, & Professional Papers

Air temperatures across the Arctic have increased in recent decades, and through complex feedbacks, vegetation and permafrost (frozen ground) are actively responding as climate warming continues. This study investigates the trends and interactions of observed air, soil-surface temperature (SST), and active-layer thickness (ALT) at Toolik Lake on the Alaskan North Slope between 1995 and 2017, as well as vegetation change over time.

Time series between 1995 and 2017 at CALM site U12B, a 1 ha plot near Toolik Lake, reveal an increase (0.50 °C/decade) in mean summer (Jun-Aug) air temperatures and a decrease (­0.23 °C/decade) in mean summer SST. In …

Directional Non-Covalent Interactions: Exploring The Nuances Of Halogen Bonds And Hydrogen Bonds In Solution And The Solid-State, Nicholas Blouin Wageling

Graduate Student Theses, Dissertations, & Professional Papers

Molecules interact in numerous ways. Halogen bonding is one of the most newly discovered and poorly understood non-covalent interactions. However, this attractive force may be a useful tool for chemists in various disciplines. The directional nature, and competitive strength of the interaction makes it a promising alternative to hydrogen bonding based molecules. Indeed, through crystal structures and solution phase anion titrations, this work has shown that a halogen bonding scaffold can outperform its hydrogen bonding analogue not only in overall interaction strength, but also in resistance to inactivation from polar solvents (an important feature in anion receptors, organocatalysts, and many …

Estimating Groundwater Inflow And Age Characteristics In An Alluvial Aquifer Along The Little Wind River, Wyoming, Derek Goble

Graduate Student Theses, Dissertations, & Professional Papers

We synoptically sampled a 2 km gaining reach of the Little Wind River in central Wyoming for ²²²Rn, CFCs and SF₆ to determine the distributed volumes and locations of discharge and estimate alluvial groundwater age characteristics. ²²²Rn was sampled in the stream, shallow in-stream piezometers and nearby alluvial groundwater wells to determine the volume and spatial distribution of groundwater discharge to the river. Age tracers, CFC and SF_6, sampled in the stream, shallow in-stream piezometers and in alluvial groundwater wells were then used to determine whether in-stream samples are capable of constraining the residence time distribution …

The Development Of A Simplified Alkalinity Titration Analyzer, Reba Van Beusekom

Graduate Student Theses, Dissertations, & Professional Papers

Alkalinity is the acid neutralizing capacity for water, meaning alkalinity measures how sensitive an aquatic system is to acidic inputs. Currently, there are various measuring systems for alkalinity available including chemical test kits, potentiometric techniques, and colorimetric methods. Commercially available products lack the ease of use combined with precision and accuracy desired for on-line process and environmental monitoring. The goal of this project is to develop a simplified alkalinity titration analyzer, called the easyTMT, to measure alkalinity with precision and accuracy comparable to the best conventional methods. The system, under development, uses the Tracer Monitored Titration (TMT) technique. TMT …

It Takes A Village To Raise A Child: Perceived Community Support And Parenting Satisfaction And Efficacyamong American Indian Young Mothers, Ann Marie Douglas

Graduate Student Theses, Dissertations, & Professional Papers

Although there has been a decline in teen pregnancy in White, African American, and Hispanic teens, American Indian teen pregnancies have stayed relatively stable. According to Indian Health Services (2014), young women under the age of 24 years old account for 80 percent of births in the American Indian population. With a high percent of young mothers in this population and the stigma associated with young parenting, it is important to explore American Indian young mothers’ satisfaction and efficacy associated with parenting. It is also important to see how American Indian communities can support young mothers. The present study examined …

Understanding The Food Water Nexus: Characterizing The Impact Of Climatological Anomalies On Agrosystems, Patrick M. Wurster Jr.

Graduate Student Theses, Dissertations, & Professional Papers

Climate variability at global and regional scales is escalating with increased atmospheric carbon and is expected to magnify the intensity and duration of meteorological extremes, especially droughts. From the many environmental stresses that diminish crop production (e.g., soil salinity, frost, soil erosion) drought is one of the most prevalent. This study focuses on the sensitivity of three key crops produced in the northwestern United States to climatological anomalies, while controlling for attribution using anomalies in price. The study differs from similar studies in that we focus on variability in production which captures both yield (tonnes/ha) and cropping area (ha), as …

Quantum Mechanics Investigation Of The Photophysical Properties Of Ruthenium(Ii)-Based Complexes Combined With The Development Of Their Force Field Parameters Using Molecular Mechanics And Molecular Dynamics Simulation, Sanaa Saad Alabbad

Graduate Student Theses, Dissertations, & Professional Papers

The focus of this study is to develop a theoretical strategy that can help guide the design of novel organometallics with desirable photophysical properties for molecular engineering. This computational study includes proposed complexes and others for which experimental data are available. The agreement between the computational results and the experimental observations confirms the validity of our procedure and the level of theory we applied in this study. The ground singlet (S0) and excited triplet (T1) electronic states and corresponding optical spectra of a series of cationic complexes —[RuH(CO)L(PPh3)2]+ (L=2,2´-bipyridyl) (Rubpy), 4,4´-dicarboxylic-2,2´-bipyridyl (Rudcbpy), bis-4,4’-(N-methylamide)-2,2´-bipyridyl (Rudamidebpy), bis-4,4’-(methyl)-2,2´-bipyridyl (RudMebpy), [Ru(CO)2dcbpy(PPh3)2]2+ (Ru(2CO)dcbpy), [Ru(H)2dcbpy(PPh3)2] (Ru(2H)dcbpy), …

Transfer Of Graphing Skills From Math To Chemistry, Brittany Danielle Busby

Graduate Student Theses, Dissertations, & Professional Papers

Most students begin their university studies with adequate mathematical skills to succeed in general chemistry. However, students have a demonstrated difficulty with the application of math in a chemistry context. The ability to apply skills to new contexts is known as transfer, and understanding and enhancing transfer of graphing skills into the context of chemistry is the primary purpose of this investigation. Graphing skills were selected as the area of emphasis because they provide a strong conceptual link between math and chemistry.

This is a two-phase, sequential, quasi-experimental, mixed-methods study. In the first phase of the study, the quantitative research …

The Power In Dice And Foam Swords: Gendered Resistance In Dungeons And Dragons And Live-Action Roleplay, Rachel M. Just

Graduate Student Theses, Dissertations, & Professional Papers

Much of the existing research on gaming suggests that women are often excluded from or discriminated against in gaming communities. However, few scholars focus on women’s positive experiences within those communities, and even fewer examine tabletop and live-action roleplaying games. In this thesis, I utilized Jurgen Habermas’ theory of communicative action, Judith Butler’s theory of gender performativity, and James C. Scott’s theory of hidden transcripts to analyze how in-game and out-of-game comradery among players created a space in which passive resistance against normative gender expectations was possible. Specifically, the question I wanted to answer was how do women communicatively enact …

Curated Chaos: A Rhetorical Study Of Axmen, Rebekah A. Mcdonald

Graduate Student Theses, Dissertations, & Professional Papers

In this study, the author uses mixed methods to analyze a three-dimensional place as a rhetorical artifact. The artifact, Axmen, is a family owned, for-profit retail store and a non-profit museum outside of Missoula, Montana. Using examples of the tangible and semiotic features found within the place, the author demonstrates and translates the rhetorical messages communicated there. These messages are then contrasted with the messages the owners and curators of Axmen want to communicate. The author argues that the current curation of museum artifacts and retail products is exclusive to white males, romanticizing blue collar work. This single-lens narrative of …

Well-Being, Meaningful Activity, And Social Closeness For Persons With Disabilities: Findings From The American Time Use Survey (Atus), Ari B. Silverman

Graduate Student Theses, Dissertations, & Professional Papers

Persons with disabilities (PWD) constitute close to one fifth of the U.S. population and tend to experience both mental and physical health disparities when compared to the general populace. Improving well-being is paramount to enhancing the health status of these individuals. Two areas that have demonstrated promise in facilitating increases in global well-being in the general population are 1) engagement in meaningful activity and 2) experiences of social closeness. Although previous research has examined the global assessment of meaningful activity and social closeness on well-being over longer time frames, few studies have investigated the direct and short-term influence of these …

Quantifying Effects Of Using Thermally Thin Fuel Approximations On Modelling Fire Propagation In Woody Fuels, David Blasen, Jesse Johnson, William Jolly, Russell Parsons

Graduate Student Theses, Dissertations, & Professional Papers

In this paper, we quantify the effects of the thermally thin fuel approximations commonly made in numerical models that eliminate temperature gradients within a heated object. This assumption is known to affect the modeled ignition and burn behavior, but there is little research on its impact, particularly in larger fuels or in numerical models including moisture and chemical decomposition of fuels.

We begin by comparing modeled to observed ignition times and burn rates. To constrain variability in the material properties of wood and focus on variability caused by fuels assumed to be thermally thin, we conduct experiments using thermogravimetric analysis …

Why Does Drought Kill Trees? Interactions Between Water, Carbon, And Fungal Symbionts, Gerard Sapes De Moreta

Graduate Student Theses, Dissertations, & Professional Papers

One of the global causes of forest die-off is climate-change induced drought. Drought kills trees by reducing water supply and non-structural carbohydrate (NSC) availability and by increasing susceptibility to negative biotic interactions. However, we lack an understanding of how water, NSC, and biotic agents interact. As a result, we still cannot accurately predict drought-induced mortality. The overarching goal of my dissertation is to increase our understanding of the interacting mechanisms leading to drought-induced mortality (DIM) and to identify physiological variables that accurately predict risk of DIM. Via greenhouse experiments with Pinus ponderosa (ponderosa pine) seedlings, I addressed three overarching research …

Examining The Relationship Between Traditional Ecological Knowledge And Cultural Resource Management, Erin Chiniewicz

Graduate Student Theses, Dissertations, & Professional Papers

No abstract provided.

In Case Of Emergency: Local Medical Services And Emergency Air Transportation In Southeast Alaska, Kourtney B. Johnson

Graduate Student Theses, Dissertations, & Professional Papers

Alaska, often referred to as “The Last Frontier”, is a vast, geographically diverse and sparsely settled landscape. Although many popular reality shows tend to exaggerate and dramatize life in Alaska, they do point to an important fact: when an emergency occurs, or someone experiences serious health complications, immediate access to sufficient medical services may not be available. Much of the state’s population faces barriers to accessing needed medical care due to large distances between communities and limited road networks due to coastal locations or challenging terrain.

Using Penchansky and Thomas’s five components of Access Theory (1981), this thesis explores factors …

Just Open A Window: Understanding The Vulnerability To Summer Heat Of A Mountain Community In The Western United States, Missoula, Mt, Julie J. Tompkins

Graduate Student Theses, Dissertations, & Professional Papers

How do we conceptualize vulnerability or resiliency to a natural hazard when it has not historically been understood as such? This study focuses on Missoula, located in mountains of western Montana, which has steadily grown by 1-2% per year to almost 75,000 residents. The formerly temperate quality of its winters and summers has also been changing. Projections from the 2017 Montana Climate Assessment estimate the state will experience a 2-5°F increase in mean annual air temperature over the next two decades, prompting city and county officials to plan for scenarios not formerly in their consideration. Of further concern is the …

Evaluation Of Autonomously Measured Alkalinity, Ph, And Pco2 Variability On A Coral Reef, Brittany Peterson

Graduate Student Theses, Dissertations, & Professional Papers

Currently, our understanding of alkalinity (A_T) variability in highly dynamic environments such as coral reefs is limited by the dearth of A_T measurements. In order to better characterize these environments, high temporal resolution A_T data are needed. This work employed the newly developed Submersible Autonomous Moored Instrument for Alkalinity (SAMI-alk), a fully autonomous in situ A_T analyzer, to study seawater A_T variability. The main goals of this research were to evaluate the utility of combining the SAMI-alk data with currently available in situ measurements of pH and partial pressure of carbon dioxide (p …

Insights Into The Proterozoic To Cretaceous Evolution Of The Western Clearwater Metamorphic Core Complex, Northern Idaho, Through Petrologic And Geochronologic Analysis, Nora Dwyer

Graduate Student Theses, Dissertations, & Professional Papers

The Clearwater metamorphic core complex (CMCC) in northern Idaho contains a rare exposure of the contact of the basal section of the Mesoproterozoic Belt Supergroup with underlying Paleoproterozoic basement. Prior to this study, this contact had not been well documented. In addition, the rocks within the CMCC preserve a complex history of metamorphism, including both Mesoproterozoic and Cretaceous-Eocene regional events. Detrital zircon analysis of five coarsely recrystallized, clean quartzite samples at this contact reveal a bimodal age distribution with peaks at around 1800 - 1900 Ma and 2650 Ma. Several grains are younger than 1700 Ma, with the youngest being …

Consequences Of Aryl Hydrocarbon Receptor Activation: Thymic Atrophy And Therapeutic Liposomal Nanoparticles, Joanna Michelle Kreitinger

Graduate Student Theses, Dissertations, & Professional Papers

The Aryl hydrocarbon Receptor (AhR) is a ligand-activated transcription factor best known for its role in xenobiotic metabolism of environmental pollutants. Activation of the AhR by its prototypical ligand 2,3,7,8-tetrachlorodibenzo-pdioxin (TCDD) leads to pronounced thymic atrophy and severe immunosuppression. Studies of AhR activation can have dual applications: to better understand AhR-mediated immunotoxicity and to harness its immunomodulatory effects for therapeutic use. Here, we first aimed to determine whether AhR-mediated thymic atrophy was ligand-dependent through the use of dietary and endogenously sourced ligands, indole-3-carbinol (I3C) and 2-(19 H-indole-39 -carbonyl)-thiazole-4-carboxylic acid methyl ester (ITE) respectively. We also aimed to identify key mediators …

Mountain Pine Beetle Induced Changes To Lodgepole Pine Forest Stand Dynamics At Lubrecht Experimental Forest, Ben G. O'Connor

Graduate Student Theses, Dissertations, & Professional Papers

No abstract provided.

Leaving More Than Footprints: Impacts Of Tourism And Perceptions Of Change In Chilean Patagonia, Heidi Blair

Graduate Student Theses, Dissertations, & Professional Papers

Visitation to protected areas is on the rise globally, and the Aysén region of Chilean Patagonia is part of that trend. Within Aysén, Cerro Castillo National Reserve is one of the protected areas that has seen the largest increase in visitation in recent years. Protected area tourism catalyzes changes in surrounding communities, and it is important to understand resident perceptions of these changes in order to inform management planning and to implement effective, equitable conservation policy. In this study, I use qualitative research methods to investigate local residents’ perceptions of social, economic, and ecological changes spurred by or related to …

An Interdisciplinary Approach To The Target Elucidation Of Novel Antibiotic 31g12, Larissa A. Walker

Graduate Student Theses, Dissertations, & Professional Papers

Staphylococcus aureus is a Gram-positive bacterial pathogen responsible for nosocomial and community-acquired infections that can quickly acquire antibiotic resistance. We have identified a novel triazole antimicrobial 31G12 based on the natural product core of nonactin isolated from the fermentation of Streptomyces griseus, that is active against many Gram-positive bacteria as well as antibiotic resistant methicillin-resistant S. aureus and vancomycin-resistant Enterococcus. The synthesis and characterization indicate that 31G12 exists as a mixture of two rotamers at room temperature and displays bacteriostatic activity against S. aureus with moderate mammalian cell toxicity. We have currently identified potential protein targets of 31G12 in …

Effect Of Neuromodulation Of Short-Term Plasticity On Information Processing In Hippocampal Interneuron Synapses, Elham Bayat Mokhtari

Graduate Student Theses, Dissertations, & Professional Papers

Neurons convey information about the complex dynamic environment in the form of signals. Computational neuroscience provides a theoretical foundation toward enhancing our understanding of nervous system. The aim of this dissertation is to present techniques to study the brain and how it processes information in particular neurons in hippocampus.

We begin with a brief review of the history of neuroscience and biological background of basic neurons. To appreciate the importance of information theory, familiarity with the information theoretic basics is required, these basics are presented in Chapter 2. In Chapter 3, we use information theory to estimate the amount of …

Large-Scale Photovoltaic Solar Implementation: Montanan Stakeholder Opportunities And Challenges, Erika Mickelson

Graduate Student Theses, Dissertations, & Professional Papers

Large-scale photovoltaic (PV) solar projects were operationalized in the 1990s resulting in a plethora of studies focusing on environmental, economic, technological, and policy studies. Minimal research investigates the similarities and differences between conveners using PV solar technology. This case study evaluates stakeholder perceptions regarding project management, project design, and external factors influencing the success of large-scale PV solar projects convened by a qualifying facility, regional utility company, and electric co-operative in Montana. Respondents revealed concepts were similar across conveners; yet, emphasized unique implications for each convener. The results indicated the importance for all conveners to incorporate marketing strategies, local interests …

Bottom-Up And Top-Down Controls On Food Webs In Headwater Streams, Miriam O. Bayer

Graduate Student Theses, Dissertations, & Professional Papers

Headwater streams account for 70% of stream channel length in the USA and are important as hotspots of nutrient uptake and native biodiversity. Biofilm, the mixed auto- and heterotrophic microbial community covering stream substrates, is where the majority of nutrient processing occurs, and forms the base of stream food webs, particularly in heavily shaded, oligotrophic streams. Both bottom-up (e.g., nutrients, light) and top-down (i.e., consumption) processes are known to affect periphyton, the autotrophic component of biofilm, but little is known about what controls the biofilm community as a whole. Top-down effects are common in streams, where fish are often the …

Data Pollution, Omri Ben-Shahar

Public Law and Legal Theory Working Papers

Digital information is the fuel of the new economy. But like the old economy’s carbon fuel, it also pollutes. Harmful “data emissions” are leaked into the digital ecosystem, disrupting social institutions and public interests. This article develops a novel framework—data pollution—to rethink the harms the data economy creates and the way they have to be regulated. It argues that social intervention should focus on the external harms from collection and misuse of personal data. The article challenges the hegemony of the prevailing view—that the injuries from digital data enterprise are exclusively private. That view has led lawmakers to focus solely …

Disagreement, Anti-Realism About Reasons, And Inference To The Best Explanation, Brian Leiter

Public Law and Legal Theory Working Papers

No abstract provided.