ASU Electronic Theses and Dissertations
This collection includes most of the ASU Theses and Dissertations from 2011 to present. ASU Theses and Dissertations are available in downloadable PDF format; however, a small percentage of items are under embargo. Information about the dissertations/theses includes degree information, committee members, an abstract, supporting data or media.
In addition to the electronic theses found in the ASU Digital Repository, ASU Theses and Dissertations can be found in the ASU Library Catalog.
Dissertations and Theses granted by Arizona State University are archived and made available through a joint effort of the ASU Graduate College and the ASU Libraries. For more information or questions about this collection contact or visit the Digital Repository ETD Library Guide or contact the ASU Graduate College at gradformat@asu.edu.
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Description
The ongoing Red for Ed movement in Arizona sparks an interesting discussion on its place as a social movement. This thesis examines the movement in close detail, particularly in regard to how it fits within the social movement literature’s insider/outsider framework. While partisanship is clearly important for understanding movement successes and failures, this study goes beyond party to explore through the case of Arizona how teacher movements are constrained by 1) teacher associations that operate as outsiders to state politics and 2) school districts that isolate the problem priorities (funding; teacher pay) from gaining large-scale public reaction that can be leveraged to change state policy. In short, I show how teacher movements face significant institutional barriers that localize their messaging and prevent insider access from state politics.
ContributorsGriffith, Matthew (Author) / Colbern, Allan (Thesis advisor) / Walker, Shawn (Committee member) / Behl, Natasha (Committee member) / Arizona State University (Publisher)
Created2020
Description
Eusocial insect colonies have often been imagined as “superorganisms” exhibiting tight homeostasis at the colony level. However, colonies lack the tight spatial and organizational integration that many multicellular, unitary organisms exhibit. Precise regulation requires rapid feedback, which is often not possible when nestmates are distributed across space, making decisions asynchronously. Thus, one should expect poorer regulation in superorganisms than unitary organisms.Here, I investigate aspects of regulation in collective foraging behaviors that involve both slow and rapid feedback processes. In Chapter 2, I examine a tightly coupled system with near-instantaneous signaling: teams of weaver ants cooperating to transport massive prey items back to their nest. I discover that over an extreme range of scenarios—even up vertical surfaces—the efficiency per transporter remains constant. My results suggest that weaver ant colonies are maximizing their total intake rate by regulating the allocation of transporters among loads. This is an exception that “proves the rule;” the ant teams are recapitulating the physical integration of unitary organisms.
Next, I focus on a process with greater informational constraints, with loose temporal and spatial integration. In Chapter 3, I measure the ability of solitarily foraging Ectatomma ruidum colonies to balance their collection of protein and carbohydrates given different nutritional environments. Previous research has found that ant species can precisely collect a near-constant ratio between these two macronutrients, but I discover these studies were using flawed statistical approaches. By developing a quantitative measure of regulatory effect size, I show that colonies of E. ruidum are relatively insensitive to small differences in food source nutritional content, contrary to previously published claims.
In Chapter 4, I design an automated, micro-RFID ant tracking system to investigate how the foraging behavior of individuals integrates into colony-level nutrient collection. I discover that spatial fidelity to food resources, not individual specialization on particular nutrient types, best predicts individual forager behavior. These findings contradict previously published experiments that did not use rigorous quantitative measures of specialization and confounded the effects of task type and resource location.
ContributorsBurchill, Andrew Taylor (Author) / Pavlic, Theodore P (Thesis advisor) / Pratt, Stephen C (Thesis advisor) / Hölldobler, Bert (Committee member) / Cease, Arianne (Committee member) / Berman, Spring (Committee member) / Arizona State University (Publisher)
Created2022
Description
Programmed cell death plays an important role in a variety of processes that promote the survival of the host organism. Necroptosis, a form of programmed cell death, occurs through a signaling pathway involving receptor-interacting serine-threonine protein kinase 3 (RIPK3). In response to vaccinia virus infection, necroptosis is induced through DNA-induced activator of interferon (DAI), which activates RIPK3, leading to death of the cell and thereby inhibiting further viral replication in host cells. DAI also localizes into stress granules, accumulations of mRNAs that have stalled in translation due to cellular stress. The toxin arsenite, a canonical inducer of stress granule formation, was used in this project to study necroptosis. By initiating necroptosis with arsenite and vaccinia virus, this research project investigated the roles of necroptosis proteins and their potential localization into stress granules. The two aims of this research project were to determine whether stress granules are important for arsenite- and virus-induced necroptosis, and whether the proteins DAI and RIPK3 localize into stress granules. The first aim was investigated by establishing a DAI and RIPK3 expression system in U2OS cells; arsenite treatment or vaccinia virus infection was then performed on the U2OS cells as well as on U2OSΔΔG3BP1/2 cells, which are not able to form stress granules. The second aim was carried out by designing fluorescent tagging for the necroptosis proteins in order to visualize protein localization with fluorescent microscopy. The results show that arsenite induces DAI-dependent necroptosis in U2OS cells and that this arsenite-induced necroptosis likely requires stress granules. In addition, the results show that vaccinia virus induces DAI-dependent necroptosis that also likely requires stress granules in U2OS cells. Furthermore, a fluorescent RIPK3 construct was created that will allowfor future studies on protein localization during necroptosis and can be used to answer questions regarding localization of necroptosis proteins into stress granules. This project therefore contributes to a greater understanding of the roles of DAI and RIPK3 in necroptosis, as well as the roles of stress granules in necroptosis, both of which are important in research regarding viral infection and cellular stress.
ContributorsGogerty, Carolina (Author) / Jacobs, Bertram (Thesis advisor) / Langland, Jeffrey (Committee member) / Jentarra, Garilyn (Committee member) / Arizona State University (Publisher)
Created2021
Description
Contraceptives are a vital part of reproductive care by preventing unwanted pregnancy, providing relief to premenstrual syndrome or PMS symptoms, and more. Birth control has been around for many centuries and has given women autonomy over their reproductive health. The Griswold v. Connecticut Supreme Court case in 1965 was the first ruling that made birth control accessible to the public under the law. However, this ruling only pertained only to married couples until the Eisenstadt v. Baird case in 1972. That case gave single women the ability to legally purchase contraceptives for themselves. In the decades since those rulings, many laws and policies have been put into place to give those in lower-income areas the ability to purchase contraceptives as well. With this increase in accessibility, those who use contraceptives, or are thinking of starting birth control, need to understand how to use it, when to use it, and the effects of using contraceptives. In the United States, nurses outnumber doctors by a 4:1 ratio and spend more time with patients than anyone else in a clinic or hospital environment. Nurses, being the main healthcare providers with whom a patient will interact, often are the ones patients ask questions about care and overall advice. Nurses must be able to relay valuable information about treatments or medicines, such as birth control, and give accurate information on the effects such treatments have. Nursing students need to be prepared. However, the amount of information provided, and opinions given might be affected by their nursing education, past experiences with birth control, and more. This project surveys nursing students at Arizona State University on their attitudes, behaviors, and beliefs towards birth control interventions, and how their individual experiences and education influence these perceptions.
ContributorsHiggins, Ilani Elyce (Author) / Gur-Arie, Rachel (Thesis advisor) / Ellison, Karin (Thesis advisor) / Maienschein, Jane (Committee member) / Arizona State University (Publisher)
Created2024
Description
Reactive oxygen species (ROS) including superoxide, hydrogen peroxide, and hydroxyl radicals occur naturally as a byproduct of aerobic respiration. To mitigate damages caused by ROS, Escherichia coli employs defenses including two cytosolic superoxide dismutases (SODs), which convert superoxide to hydrogen peroxide. Deletion of both sodA and sodB, the genes coding for the cytosolic SOD enzymes, results in a strain that is unable to grow on minimal medium without amino acid supplementation. Additionally, deletion of both cytosolic SOD enzymes in a background containing the relA1 allele, an inactive version of the relA gene that contributes to activation of stringent response by amino acid starvation, results in a strain that is unable to grow aerobically, even on rich medium. These observations point to a relationship between the stringent response and oxidative stress. To gain insight into this relationship, suppressors were isolated by growing the ∆sodAB relA1 cells aerobically on rich medium, and seven suppressors were further examined to characterize distinct colony sizes and temperature sensitivity phenotypes. In three of these suppressor-containing strains, the relA1 allele was successfully replaced by the wild type relA allele to allow further study in aerobic conditions. None of those three suppressors were found to increase tolerance to exogenous superoxides produced by paraquat, which shows that these mutations only overcome the superoxide buildup that naturally occurs from deletion of SODs. Because each of these suppressors had unique phenotypes, it is likely that they confer tolerance to SOD-dependent superoxide buildup by different mechanisms. Two of these three suppressors have been sent for whole-genome sequencing to identify the location of the suppressor mutation and determine the mechanism by which they confer superoxide tolerance.
ContributorsFlake, Melissa (Author) / Misra, Rajeev (Thesis advisor) / Shah, Dhara (Committee member) / Wang, Xuan (Committee member) / Arizona State University (Publisher)
Created2024
Description
The Pennsylvania Department of Education recently adopted the new academic standards for Science, Technology & Engineering, and Environmental Literacy and Sustainability (STEELS). Scaling STEELS across the commonwealth is a challenging endeavor that depends upon local school districts' implementation of STEELS-based instruction. Therefore, it behooves local school districts to develop strategies supporting local STEELS adoption. The current action research study examined the influence of an intervention built around a Professional Learning Community (PLC) to support a local school district’s implementation of STEELS guided by the Concerns Based Adoption Model (CBAM; Hall & Hord, 2020). Four secondary science teachers from the Bellwood-Antis School District participated in a PLC. The implementation process of the PLC group was measured via the three diagnostic dimensions of CBAM: Innovation Configurations (IC), Stages of Concern (SoC), and Levels of Use (LoU). A concurrent mixed-methods action research design was employed to collect and analyze CBAM measures. The SoC dimension was measured quantitatively via the Stages of Concern Questionnaire. Individual scores were converted to a whole-group PLC SoC Profile for analysis. SoC, LoU, and IC dimensions were assessed qualitatively via semi-structured interviews. Meta-inferences were developed from combined data analysis of quantitative and qualitative data. A CBAM diagnosis for the PLC group was the primary outcome of this action research cycle, which indicated that the PLC members moved into the early phases of implementation during the intervention. Findings from the current cycle of action research informed an updated intervention game plan to be used in the next phase of implementation.
ContributorsMartin, Travis (Author) / Boutot, Amanda (Thesis advisor) / Coudret, Dude (Committee member) / Wagner, Don (Committee member) / Arizona State University (Publisher)
Created2024
Description
This study examined opportunities for enhancing transfer outcomes for community college students through summer research opportunities at a university. It emphasizes the significance of academic capital, derived from Bourdieu's cultural capital theory, in facilitating successful transfers. By offering ten-week paid summer research opportunities at a university for community college students, the study aims to identify practices supporting transfer abilities and addressing disparities in social mobility. The concept of academic capital encompasses easing financial concerns, enhancing support networks, and ensuring access to relevant information for students from low-income backgrounds. The research findings highlight the positive impact of research internships on students' academic capital, transfer readiness, and faculty perceptions. The study addresses three key research questions: (1) Academic capital increase: Analyzing changes in community college students' academic capital post participation in summer research projects; (2) Student transfer perceptions: Examining how summer research opportunities influence community college students' perceptions of transferring to four-year programs; (3) Faculty views on student success: Investigating faculty mentors' perceptions of community college student interns succeeding in baccalaureate programs. The findings underscore increases in academic capital, improved student perceptions of transfer capacity, and positive faculty views of community college student researchers. Despite challenges like payment delays and legal status issues affecting student participation, the study highlights the importance of providing support and opportunities for community college students to enhance their academic capital and improve transfer readiness. The research emphasizes the need for tailored transitional supports and strategic infrastructure changes to ensure successful transfers from two-year to four-year programs, ultimately aiming to uplift social mobility for diverse learners and advance educational and industry goals.
ContributorsNolan Chavez, Holly E (Author) / Dorn, Sherman (Thesis advisor) / Hesse, Maria (Committee member) / Prince, James (Committee member) / Arizona State University (Publisher)
Created2024
Description
There is increasing interest in growing strawberries (Fragaria ×ananassa) in indoor environments such as vertical farms, as the continued sustainability of outdoor
production is threatened due to reductions in arable land, labor shortages, and an
increased frequency of drought. However, the optimal conditions for growing
strawberries hydroponically in sole-source lighting conditions have yet to be established.
The objectives of this research were to investigate the optimal lighting conditions and
nutrient concentrations for strawberry production in vertical farming. In the first study,
bare-root plants of two strawberry cultivars, ‘Albion’ and ‘Monterey’, were grown in an
indoor vertical farm under a 22 °C air temperature and an 18-h photoperiod with 90
μmol·m−2·s−1 of blue light and 250 μmol·m−2·s−1 of red light with and without 50
μmol·m−2·s−1 of additional far-red light from light-emitting diodes. Adding far-red light
increased the fruit number per plant by 36%, total fruit fresh mass by 48%, and total
soluble solids content by 12% in ‘Albion’, but not ‘Monterey’. In the second study, bare
root plants of strawberries ‘Monterey’ and ‘San Andreas’ were grown under a 23 °C air
temperature and an 18-h photoperiod with an extended photosynthetic photon flux
density of 350 μmol·m−2·s−1. Plants were subjected to four potassium to nitrogen ratios
(K:N) of 1.5:1, 2.5:1, 3.5:1, and 4.5:1 in a deep-water culture hydroponic system.
Increasing K:N from 1.5:1 to 4.5:1 increased the root dry mass of ‘Monterey’, but
generally had little to no effect on vegetative growth in either cultivar. In addition, in
both cultivars, increasing K:N from 1.5:1 to 4.5:1 decreased individual fruit size and
increased titratable acidity. These results suggest that for indoor strawberry production,
including far-red light in sole-source lighting can improve fruit production in some
strawberry cultivars. However, increasing K:N in the hydroponic nutrient solution
generally does not benefit plant growth, fruit production, and fruit quality.
ContributorsRies, Jonathan (Author) / Park, Yujin (Thesis advisor) / Sagers, Cynthia (Committee member) / Meng, Qingwu (Committee member) / Arizona State University (Publisher)
Created2024
Description
The Northwest (NW) Atlantic porbeagle Lamna nasus is overfished and captured as bycatch in fisheries within the region. A comprehensive understanding of the population’s life history (e.g., reproduction) and habitat use, and the impact of capture with different gear types (e.g., post-release mortality) is needed to ensure effective fisheries management plans, develop bycatch mitigation strategies, and support stock recovery. This research used satellite tagging technologies to address gaps in knowledge needed to support management and conservation decisions for the NW Atlantic porbeagle. I provided the first estimate of post-release survival and recovery periods for immature porbeagles captured with rod-and-reel. Although survival was high (100%), juvenile porbeagles exhibited a recovery period in surface waters that may make them vulnerable to further fishing interactions. Next, I described the vertical habitat use of young porbeagles to recommend possible fishing modifications to reduce risk of capture. Young porbeagles spent more time in surface waters during summer compared to fall and during the night compared to day, suggesting that risk of capture may be reduced by setting gear deeper during summer and at night when this life stage’s behavior is reduced to the upper water column. Then, I provided an analysis of the seasonal and life stage-based habitat use of porbeagles. Space use was concentrated in continental shelf waters around Cape Cod, Massachusetts regardless of season and life stage. Given the relatively small and static high occupancy area overlaps with a high concentration of fishing activity, this region could be considered for spatial management of the NW Atlantic porbeagle. Finally, I used ultrasonography and satellite tagging to describe the three-dimensional habitat use of gravid porbeagles for the first time. Gravid porbeagles demonstrated seasonal differences in horizontal and vertical habitat use but spent most of the pupping season in waters southeast of Cape Cod or on Georges Bank, suggesting this region may be serving as a pupping ground for at least a portion of this population. Conservation efforts should focus on these important habitats to protect the next generation of porbeagles.
ContributorsAnderson, Brooke Nicole (Author) / Ferry, Lara (Thesis advisor) / Bowlby, Heather (Committee member) / Hammerschlag, Neil (Committee member) / Kang, Yun (Committee member) / Saul, Steven (Committee member) / Sulikowski, James (Committee member) / Arizona State University (Publisher)
Created2024
Description
Years of teaching experience have long been taken as an important indicator of teacher and school quality in primary and secondary schools. However, research on the effects of teacher years of experience on student outcomes has shown mixed results. To investigate the source of variation causing these mixed results, this study examined a broad range of student and classroom compositions that might affect the relationship between teacher years of experience and student outcomes, including standardized test scores in English Language Arts and Mathematics, Social-Emotional Test scores, and the count and severity of student disciplinary incidents. Using multilevel regression, this study analyzed longitudinal data obtained from the largest school district in the state of Arizona, Mesa Unified School District, which is classified as a mid-high poverty district. Despite the large sample size, a very weak and non-significant relationship was found for teacher years of experience on any student outcome. In contrast, student and family demographic backgrounds were significantly related to student outcomes. English and Math scores were significantly associated with student giftedness, home languages, and English learning status. Social-emotional test scores were significantly related to race/ethnicity, home languages, and special education status. Both discipline counts and severity were statistically associated with race/ethnicity, and gender, while special education status was significantly related only to discipline severity. In addition, classroom composition variables based on student and family demographics, and students’ prior year scores on the outcome were significantly related to student outcomes. These results suggest that student characteristics, contextual classroom composition variables arising from student backgrounds are more important in predicting student outcomes than teacher years of experience, at least in a mid-high poverty school district. Therefore, student placements might be a key to addressing educational inequity for high-need students in mid-high poverty schools, consistent with prior studies in high-poverty schools.
ContributorsJin, Jeongim (Author) / Borman, Geoffrey (Thesis advisor) / West, Stephen (Committee member) / O'Reilly, Joseph (Committee member) / Zheng, Yi (Committee member) / Arizona State University (Publisher)
Created2024