This collection includes both ASU Theses and Dissertations, submitted by graduate students, and the Barrett, Honors College theses submitted by undergraduate students. 

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Since its discovery in 1524, many people have characterized the vermiform appendix. Charles Darwin considered the human appendix to be a vestige and a useless structure. Others at the time opposed this hypothesis. However, Darwin's hypothesis became prevalent one until recently when there became a renewed interest in the appendix

Since its discovery in 1524, many people have characterized the vermiform appendix. Charles Darwin considered the human appendix to be a vestige and a useless structure. Others at the time opposed this hypothesis. However, Darwin's hypothesis became prevalent one until recently when there became a renewed interest in the appendix because of advancements in microscopes, knowledge of the immune system, and phylogenetics. In this review, I will argue that the vermiform appendix, although still not completely understood, has important functions. First, I will give the anatomy of the appendix. I will discuss the comparative anatomy between different animals and also primates. I will address the effects of appendicitis and appendectomy. I will give background on vestigial structures and will discuss if the appendix is a vestige. Following, I will review the evolution of the appendix. Finally, I will argue that the function of the appendix is as an immune organ, including discussion of gut-associated lymphoid tissue (GALT), development of lymphoid follicles in GALT and their comparison within different organs, Immunoglobulin A (IgA) function in the gut, biofilms as evidence that the appendix is a safe-house for beneficial bacteria, re-inoculation of the bowel, and protection against recurring infection. I will conclude with future studies that should be conducted to further our understanding of the vermiform appendix.
ContributorsPrestwich, Shelby Elizabeth (Author) / Cartwright, Reed (Thesis director) / Lynch, John (Committee member) / Furstenau, Tara (Committee member) / School of Geographical Sciences and Urban Planning (Contributor) / School of Life Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2018-05
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Due to the widely accepted trend of urbanization displacing wildlife from their natural habitats and niches, many wildlife conservation organizations have sprouted up, even in Phoenix. Liberty Wildlife Foundation is one that rehabilitates avian wildlife. Several studies have mentioned an opposing theory: that urbanization helps conserve those species that have

Due to the widely accepted trend of urbanization displacing wildlife from their natural habitats and niches, many wildlife conservation organizations have sprouted up, even in Phoenix. Liberty Wildlife Foundation is one that rehabilitates avian wildlife. Several studies have mentioned an opposing theory: that urbanization helps conserve those species that have turned urban environments into a niche of their own. Since these wildlife conservation centers are localized in cities themselves, this brings into question these organizations' definitions of the term "wildlife." This study examined injury and recovery statistics to determine just how many of the patients admitted were conventional wildlife versus urban-dwelling city birds, and whether this classification had any effect on their likeliness of recovery and release. The data showed that out of over 130 species, a few key urban species contributed to an overwhelmingly large majority of injured birds admitted to the center in 2017; urban and non-urban birds, however, had relatively equal average release frequencies, demonstrating then that their likelihood of recovery was predominantly dependent on the injury borne by them.
ContributorsVirdee, Rishika Kaur (Author) / Liebig, Juergen (Thesis director) / Lynch, John (Committee member) / Haight, Kevin (Committee member) / School of Life Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2018-05
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Description

People have known about mass biodiversity loss and the human actions that drive it for decades now, and yet we have largely failed levels to change our behavior to protect the environment. What’s failing to motivate people to change? Some conservation psychologists have partially blamed the negative way we communicate

People have known about mass biodiversity loss and the human actions that drive it for decades now, and yet we have largely failed levels to change our behavior to protect the environment. What’s failing to motivate people to change? Some conservation psychologists have partially blamed the negative way we communicate about environmental issues for paralyzing audiences into doing nothing because they feel helpless to change such a big problem. Instead, many psychologists have called for using positive emotions in communication to motivate an audience, but there’s still little research showing whether that’s a more effective approach or not. To study whether positive or negative emotions are really more motivational for inspiring change, I looked at how different emotions were used in the discourse about an emerging conservation technology called de-extinction as a case study. De-extinction claims to be both a tool for fighting biodiversity loss and for inspiring more positive and inspiring narratives in conservation. In this thesis, I examine those claims by exploring five emotions that the discourse around de-extinction elicits: fear, guilt, grief, awe and hope. I examined the motivating power of those emotions and what kind of actions de-extinction discourse motivates or fails to motivate through the way it uses those emotions. I found that de-extinction discourse erases negative emotions and boosts positive ones as many conservation psychologists recommend. However, de-extinction discourse accomplishes this in misleading ways: it minimizes the sense of importance of ongoing extinctions by framing extinction as a reversible phenomenon, and it overstates the ability of technology alone to combat the extinction crisis without requiring societal change. As a result, de-extinction discourse could risk making the public less motivated to take personal action to forward conservation goals. I conclude that positivity or negativity should not be the central concerns for motivating action, but rather efficacy and honesty.

ContributorsSchnebly, Risa (Author) / Minteer, Ben (Thesis director) / Lynch, John (Committee member) / Rojas, Christopher (Committee member) / School of Life Sciences (Contributor, Contributor) / Barrett, The Honors College (Contributor)
Created2021-05
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Description

Due to the COVID-19 pandemic, pre-health individuals around the world encountered a range of challenges. Research and internship opportunities were cancelled, clinical experience was unreachable, and prerequisites became more demanding in a remote setting. I myself was working in a research lab in Switzerland when the pandemic was declared, resulting

Due to the COVID-19 pandemic, pre-health individuals around the world encountered a range of challenges. Research and internship opportunities were cancelled, clinical experience was unreachable, and prerequisites became more demanding in a remote setting. I myself was working in a research lab in Switzerland when the pandemic was declared, resulting in my career-altering internship to be cut short six months. My life-long friend, Alejandra, had the same experience and reached out to me with an extraordinary idea to unite and empower pre-health individuals on a national level. With my skills in event planning combined with her vision, we built the National Pre-Health Conference (NPHC): a 3-day virtual event for pre-health individuals to explore medical careers and learn how to pursue their professional goals, particularly during these uncertain times. We held our inaugural conference with the theme A Future in Medicine in 2020 with over 1000 attendees from around the country. In 2021, we held our second-annual conference with the theme Unity in Healthcare with over 1000 attendees as well. In addition to planning the second-annual NPHC, I employed pre-event and post-event surveys to assess the confidence level of attendees before and after the conference in healthcare experience, research experience, standardized testing, community service, academics, essay writing, and completing graduate/professionals school applications. We found that NPHC improved the confidence level of attendees in all categories. Overall, understanding how NPHC benefits pre-health students will help our team improve for future conferences.

ContributorsChildress, Alexia (Author) / Compton, Carolyn (Thesis director) / Lynch, John (Committee member) / Barrett, The Honors College (Contributor) / School of International Letters and Cultures (Contributor) / School of Life Sciences (Contributor)
Created2021-12
Description

Due to what is known as the “biologically desert fallacy” and the pervasive westernized ideal of wilderness that has influenced widespread American Conservation culture for millennia, urban areas have long been deemed as areas devoid of biodiversity. However, cities can contribute significantly to regional biodiversity and provide vital niches for

Due to what is known as the “biologically desert fallacy” and the pervasive westernized ideal of wilderness that has influenced widespread American Conservation culture for millennia, urban areas have long been deemed as areas devoid of biodiversity. However, cities can contribute significantly to regional biodiversity and provide vital niches for wildlife, illuminating the growing awareness that cities are crucial to the future of conservation and combating the global biodiversity crisis. In terms of the biodiversity crisis, bats are a relevant species of concern. In many studies, different bat species have been broadly classified according to their ability to adapt to urban environments. There is evidence that urban areas can filter bat species based on traits and behavior, with many bats possessing traits that do not allow them to live in cities. The three broad categories are urban avoiders, urban adapters, or urban exploiters based upon where their abundance is highest along a gradient of urban intensity. A common example of an urban exploiter bat is a Mexican Free-tailed bat, which can thrive and rely on urban environments and it is found in the Phoenix Metropolitan area. Bats are important as even in urban environments they play vital ecological roles such as cactus pollination, insect management, and seed dispersal. Bat Crazy is a thesis project focused on urban enhancement and the field of urban biodiversity. The goals of this thesis are to observe how bio-conscious urban cities that work to promote species conservation can serve as a positive tool to promote biodiversity and foster community education and engagement for their urban environment.

ContributorsKaiser, Nicole (Author) / Senko, Jesse (Thesis director) / Angilletta, Michael (Committee member) / Lynch, John (Committee member) / Barrett, The Honors College (Contributor) / School of International Letters and Cultures (Contributor) / School of Life Sciences (Contributor)
Created2023-05
Description
Porphyromonas Gingivalis (P.G.) is a gram-negative anaerobic bacillus that is commonly implicated in periodontal disease in humans via invasion of oral epithelial cells. Characterizing the intracellular mechanisms that allow for these infections to take place is important for future attempts to stop or halt the spread of infection. Given the

Porphyromonas Gingivalis (P.G.) is a gram-negative anaerobic bacillus that is commonly implicated in periodontal disease in humans via invasion of oral epithelial cells. Characterizing the intracellular mechanisms that allow for these infections to take place is important for future attempts to stop or halt the spread of infection. Given the complexity of bacterial virulence, research on the subject often necessitates precise measurements of very specific biochemical pathways. In this study, we focus on the type IX secretion system utilized by P.G. to initiate colonization of host cells. Specific to this secretion system is the PorX-PorY two-component regulatory system. Here we use the bacterial adenylate cyclase based 2 hybrid system to test if two specific domains of the PorX-PorY system communicate intracellularly with each other; and hence gain further knowledge on how this infection occurs.
ContributorsKrautz, Zackary (Author) / Shi, Yixin (Thesis director) / Lynch, John (Committee member) / Barrett, The Honors College (Contributor) / Dean, W.P. Carey School of Business (Contributor) / School of Life Sciences (Contributor)
Created2024-05