Digital Commons Network^™

Construction And Mutagenesis Of Ssv1 Mutants In Extreme Viruses, Lou Ann F. O'Connor, Jono Abshier, Kenneth M. Stedman

Student Research Symposium

Archaeal viruses with unique structures such as spindle-shaped virions are found abundantly in extreme environments like geothermal hot springs around the world. Among all spindle-shaped viruses, the model Sulfolobus Spindle-shaped Virus 1 (SSV1) is best studied. Creating the lemon-shaped or spindle-shaped virion structure are two proteins, VP1 as the major capsid protein, and VP3 as the minor capsid protein. The primary structure of VP1 consists of a proteolytic cleavage site at position 66 that is believed to be necessary for virus evolution. Recent studies showed that genetic mutation of the amino acid, glutamate (E) at position 66 in VP1 which …

Histone Changes As A Response To Lactic Acid Selection In Cells Of Austrofundulus Limnaeus, Lori Tran, Jason Podrabsky, Chelsea Hughes

Student Research Symposium

The killifish Austrofundulus limnaeus is an extremophile native to small temporary ponds of Venezuela. Normal embryonic development of A. limnaeus is segmented into up to three stages of metabolic depression (diapause), and both developing and diapausing embryos can survive long bouts of the complete absence of oxygen (anoxia) by using anaerobic metabolic pathways. While there has been much focus on how mutations in DNA drive evolution, environmental stress can cause heritable changes to histone post-translational modifications (hPTMs) in multiple species. However, this evolutionary role of hPTMs has never been studied in A. limnaeus. Additionally, the possible evolutionary role of extracellular …

Relationship Between Trunk Cross-Sectional Area Growth And Water Stress In Garry Oaks (Q. Garryana): A Species Of Conservation Concern, John Cochrane

Student Research Symposium

In the Pacific Northwest, Quercus garryana (Garry oak trees) support over 627 native species. Garry oak natural habitat was originally maintained by indigenous practices but has been reduced to 5-10% of its range due to change in land management strategies. To support oak conservation, we need to understand heat and water affect the growth and physiology of this species. In this study, we created a fixed linear model of trunk cross-sectional growth with water stress (Ψ), photosynthetic water-use efficiency (δ¹³C), and leaf Carbon-Nitrogen ratio. We collected branch samples from the canopies of 47-64 mature Garry oaks in the …

Story Of Your Lazy Function’S Life: A Bidirectional Demand Semantics For Mechanized Cost Analysis Of Lazy Programs, Laura Israel, Nicholas Coltharp

Student Research Symposium

Lazy evaluation is a powerful tool that enables better compositionality and potentially better performance in functional programming, but it is challenging to analyze its computation cost. Existing works either require manually annotating sharing, or rely on separation logic to reason about heaps of mutable cells. In this paper, we propose a bidirectional demand semantics that allows for reasoning about the computation cost of lazy programs without relying on special program logics. To show the effectiveness of our approach, we apply the demand semantics to a variety of case studies including insertion sort, selection sort, Okasaki's banker's queue, and the push …

Promoting Student Engagement In Research In An Undergraduate Language-Development Course, Mitchell Kloer, Isabelle Trujillo, Teresa Roberts, Carolyn Quam

Student Research Symposium

This presentation will provide student perspectives on benefits of incorporating inclusive research activities within an undergraduate Speech and Hearing Sciences course. In Speech and Language Development in Children (SPHR 372U), instructor Quam incorporates a research project focusing on an issue of equity, inclusion, and social justice. One overarching goal is to reduce barriers of access to scientific research and increase engagement for college students, particularly those from historically underrepresented groups. The project is segmented into 3 steps that mirror literature review, critical analysis, and proposal. The project is collaborative, iterative throughout the term, and each step in the research process …

Stem Students And Faculty See Value In A Classroom Belonging Exercise, Kaisa S. Holt, Elizabeth A. Runkel-Baez

Student Research Symposium

Enhancing belonging in undergraduate STEM classrooms are pivotal for student success. This study examines a belonging exercise's implementation and impact in multiple STEM courses from 2017 to 2019. Faculty perspectives were gathered from a survey of 92 respondents, indicating a high level of perceived benefit (92%). Coded responses highlighted shared experiences and diversity mindset promotion. 30% explicitly mentioned benefits for both students and instructors. Additionally, 76% of faculty saw potential of belonging exercises in their own classrooms. It is important to promote using belonging interventions and also understand how STEM students perceive their value and utility. Three focus groups with …

Expressive And Instrumental Social Capital Facilitates Network Connections For Community College Transfer Students In Stem, Makenna R. Stone

Student Research Symposium

Students that transfer from a community college (CC) to a university often experience social and academic barriers that can lead to feelings of isolation and challenge their persistence. One way to alleviate these barriers is to develop capital. We aimed to understand how a cohort of CC STEM transfer students may have developed and exhibited social capital, or “assets accessed through social connections”. We leveraged the Network Theory of Social Capital to examine the instrumental (i.e., concrete advice and support) and expressive (i.e., emotional support and encouragement) actions that led to feelings of connection and persistence. We conducted semi-structured interviews …

Computationally Assisted Mechanistic Analysis Of The Protonolysis Of A Pt–Me Bond, Clement Dasilva

Student Research Symposium

Mechanistic study of the protonolysis of (cod)PtMe2 could give insight into the activation of C-H bonds by platinum because it is the microscopic reverse reaction. Two possible mechanisms for the protonolysis of dimethyl platinum complexes have been proposed, with experimental and computational data supporting the single step, SE2, over the multistep, SE(ox) mechanism. New experimental work from our group supports a multi-step mechanism with multiple acid molecules. In this work, the SE2 mechanism as well as a proposed SE(ox) mechanism were computationally modeled with a single equivalent of acid, TFAH, and two equivalents using density functional theory. The modeled pathways …

Why People Pee In Public: Is A Lack Of Public Restrooms Keeping Portland Too Weird?, Cece Austin

Student Research Symposium

Why People Pee in Public: Is a Lack of Public Restrooms Keeping Portland Too Weird?

Cece Austin1, Shirley Jackson, PhD12

1University Honors Department, Portland State University, Portland, OR, USA 2Department of Sociology, Portland State University, Portland, OR, USA

Various factors, including gender, housing status, socioeconomic status, and disability, impact access to public restrooms in Portland, Oregon. A pilot program involving the implementation of public restrooms has caused a significant reduction in public defecation in San Francisco. This research demonstrates the efficacy of this existing working model, which could be similarly implemented in Portland with some adjustments. Portland has the Portland …

Feesability Of Laryngeal Endoscopy Simulation Labs In Student Training: A Scoping Review, Anna Thut

Student Research Symposium

Fiberoptic Endoscopic Evaluation of Swallowing (FEES) involves passing a flexible endoscope through the nose and down the throat to provide a detailed view of the throat, airway, and vocal folds. With the scope in place, people can eat and drink, allowing the clinician to evaluate for safe swallowing. Speech-Language Pathologists (SLP) use FEES for diagnostic evaluation and to gauge therapy progress and effectiveness. Simulation training on a low or high-fidelity model may provide a bridge for SLP graduate students to gain competency before being introduced to FEES in a clinical setting. This review aims to gather evidence on the use …

Trends Of Groundwater Levels Over Time, Parvaneh Z. Karch-Agnew

Student Research Symposium

Groundwater is water absorbed by the soil and earth beneath the surface, saturating it, and the groundwater level is the level at which the saturation zone ends near the surface. Despite groundwater’s critical importance, only a few studies have compared groundwater level changes from in-situ measurements made in different aquifers on diverse continents. Here, I analyzed groundwater level time series to characterize how groundwater levels have changed over time in different places. I used Python and Jupyter Notebook along with the pandas and matplotlib modules to graph groundwater level changes over time. The data analyzed here derive from a Hydroshare …

Plasma Ion Source, Nathan K. Davis

Student Research Symposium

It is well known that a plasma can be created with both high input power and ultra low pressure. The challenge is in creating these same plasma characteristics with both lower power while maintaining a higher pressure. We have developed an ion beam by careful manipulation of magnetic and electric fields. Magnetic fields are used to accelerate ambient electrons to ionize the low pressure gas into a plasma. Electric fields are used to extract the ions into a focused beam. To achieve these initial ionizations, an artificial vacuum is created to reach low enough pressures to ionize the gas. A …

Method Validation Of Metals In Environmental Soil Samples, Sofia Deangelis, Nana Nguyen

Student Research Symposium

Vehicles are a major source of metal accumulation in terrestrial environments. Green infrastructure, such as bioswales, has been implemented as a way to mitigate this damage. However, there is a limited understanding of the processes that occur in these bioswales as few go back after implementation to identify areas in the bioswale with accumulation of pollutants. Inductively coupled mass spectrometry (ICP-MS) has the potential to be used in this type of study due to the machine’s high sensitivity and selectivity. However complications can arise while using the ICP-MS to characterize complex environmental samples. This study seeks to optimize microwave assisted …

Going Down An Incline With Chatgpt, Corey R. Sissons

Student Research Symposium

In our Large Language Model (LLM) research, examining ChatGPT 4, we devised a physics problem involving an object descending an inclined plane. Through variations in terminology such as "rolling," "sliding," "solid sphere," "hollow sphere," "wooden ramp," "no-slip ramp," and more, we sought to evaluate LLM responses for different scenarios. Our analysis aimed to discern whether the LLM’s answers exhibited expertise in the field of physics. This experiment sheds light on LLM’s ability to give accurate and precise physics answers as well as variation in responses to nuanced changes in problem formulation. This provides valuable insights into its proficiency and potential …

Work And Psychological Recovery Experiences Of Asian American And Pacific Island Workers In Higher Education, Christine M. Beceril

Student Research Symposium

Individuals from Asian, Asian American, and Pacific Islander (AAPI) backgrounds constitute the largest and fastest-growing minority group in the U.S. job market - comprising 6.7% of the U.S. population and expected to reach 15% by 2065 (United States Census Bureau, 2022). Despite their rapid growth, there has been a scarcity of literature in industrial-organizational psychology, with limited research on how AAPI workers engage in psychological recovery after work. This is a critical, yet unexplored area as previous research on psychological recovery from work has been investigated with homogenous White samples. Additionally, AAPI workers play integral roles in the U.S. higher …

Development Of A Two-Photon Laser Scanning Microscope, Jess Hollenbaugh

Student Research Symposium

The objective of this project was to convert a Sarastro 2000 confocal laser scanning microscope into a system capable of imaging using two-photon excitation (TPE) fluorescence for the use of the PSU biology department. TPE microscopy operates on the ability of fluorophores to accept two photons each with half the energy of a desired transition in a single quantum event via a virtual energy state and then emit a higher energy photon upon relaxation. This is preferable to single-photon excitation (SPE) due to the lower energy photons causing less damage to delicate biological samples. The adaptation process included physically altering …

Respiratory-Swallowing Coordination In Motor Neuron Disease: A Scoping Review, Mariam Z. Mansoor

Student Research Symposium

Respiratory-swallowing coordination (RSC) is essential for providing efficient breathing and optimal swallowing function. Most commonly used methods of measuring RSC include nasal thermistry, and respiratory inductance plethysmography (RIP) to determine direction and durations of airflow. Outcome measures include swallow apnea duration (SAD) and respiratory phase pattern (RPP), i.e., direction of airflow pre- and post-SAD. The goal of the current project was to conduct a scoping literature review of RSC, focusing on the motor neuron disease (MND) population, including people with amyotrophic lateral sclerosis (ALS). A multi-engine literature search was conducted in 2023-24 via PubMed and Google Scholar. No limitations were …

Analyzing Intensifying Storm Events Correlation To Landslide Frequency In Portland’S West Hills, Aurora Villa Juan

Student Research Symposium

As the Pacific Northwest climate changes, extreme weather, such as intensifying storms, and a shift in the type of precipitation experienced with warmer winters causing more precipitation to fall as rain instead of snow, may lead to an increased frequency of landslides. There have been several recent landslides in Portland, noticeable to the public, particularly in areas of high elevation such as Council Crest, which stands at 1,073 feet. Additionally, residents of neighboring homes have observed changes in the landscape, including those on private properties. To better safeguard both public and private property, comprehensive research and mitigation efforts are required. …

Comparative Life Cycle Assessment Of Recycling Processes For Perovskite Solar Cells, Juan P. Herrera, Jules Freeman, Achyuth Ravilla, Ilke Celik

Student Research Symposium

Perovskite solar cells (PSCs) have emerged as a promising option for solar energy generation. However, it is essential to consider the environmental impact of these innovative photovoltaic (PV) technologies as the industry moves towards commercialization. Researchers are currently exploring ways to recycle PSCs to recover valuable materials and reduce their environmental impact at the end of their life. To ensure the sustainability of PSCs, this study evaluates and compares the environmental impacts of five recently developed recycling approaches. The Tool for Reduction and Assessment of Chemicals (TRACI) method was utilized to measure environmental impacts in categories such as acidification (kg …

Activism And Stress, Ashanti Laine T. Peredo, Taylor Gayton, Lalaine Sevillano

Student Research Symposium

Black women often shoulder a heavier burden of financial, social, and physical responsibilities within their families compared to non-Black individuals who do not identify as women. This increased load contributes significantly to mental health disorders and psychological distress and well as physical disparities. When compounded with experiences of racism and sexism, these responsibilities can lead to a sense of social invisibility and foster a tendency towards stoicism. This study is a mixed method study as it aims to quantitatively examine the relationship between activism, physical wellbeing measured by the Conserved Transcriptional Response to Adversity (CTRA), and psychological wellbeing among Black …

Improved Genome Maintenance And Dna Replication In The Anoxia Tolerant Annual Killifish, Riley A. Roth-Carter

Student Research Symposium

Timely and faithful replication of the genome is a requirement for cell survival and proliferation, with errors in this process leading to cancers and cell death. DNA replication during exposure to stressful conditions can lead to increased mutational burden, with collapsed replication forks causing mutations leading to cancers due to loss of repair capabilities during these exposures. Learning how stressful DNA replication takes places can lead to a better understanding of how resistant cancers survive similar conditions, like hypoxic tumor microenvironment, direct irradiation, and DNA damaging chemotherapeutics. Using an extremophile model, Austrofundulus limnaeus, which can survive these genotoxic stressors could …

The Influence Of A Ubiquitous Filter Feeder On Coastal Microbial Communities., Melissa Steinman, Moritz S. Schmid, Robert K. Cowen, Su Sponaugle, Kelly R. Sutherland, Anne W. Thompson

Student Research Symposium

Doliolids have a unique ability to impact the marine microbial community through bloom events and high filtration rates. Their predation on large eukaryotic microorganisms is established and evidence of predation on smaller prokaryotic microorganisms is beginning to emerge. We studied the retention of both eukaryotic and prokaryotic microbial taxa by wild-caught doliolids in the northern California Current system. We use qPCR to quantify the impact of doliolids on three important and globally abundant taxa: Synechococcus, SAR11 and diatoms. Doliolids were collected during bloom events identified at three different shelf locations with variable upwelling intensities. We discovered that in addition …

Variability Of Grazing By Appendicularians On Prochlorococcus, Carey Sweeney

Student Research Symposium

The marine picocyanobacterium, Prochlorococcus is the most abundant photosynthetic cell on Earth. These cells are critical to global primary productivity and are critical to biogeochemical cycles of the open ocean. While abiotic environmental factors that influence Prochlorococcus are relatively well-understood, biotic controls, especially predation, are not well-studied. Appendicularians are ubiquitous invertebrate grazers that feed on microbes including Prochlorococcus in the open ocean. However, the details of this feeding interaction have not been characterized. In a laboratory study, I showed that prey retention of Prochlorococcus increases as the life stage of the appendicularians advances and increases with increasing concentration of prey. …

Development Of A Fast-Neutron Source Localization System, Abdulsalam F. Al Mutairi

Student Research Symposium

Power generation by nuclear fusion is a continuing ambition that has been the focus of nuclear fusion research for nearly a hundred years. However, small-scale fusion reactors have further propulsion and neutron imaging applications that don’t require greater than breakeven efficiencies that a fusion energy source needs. Inertial Electrostatic Confinement (IEC) fusion devices have the potential for miniaturization, making them a strong candidate for such applications. Yet the contributions of different interactions within an IEC fusion device are still not fully understood. Imaging an IEC device and investigating each interaction's Neutron Production Rate (NPR) can enhance design efficiency. Neutron imaging …

Say It With Flowers: The Semiotics Of A Not-So Secret Language, Cecilia Januszewski

Student Research Symposium

The Victorian flower language Is mythologized as a widely known communicatory practice Involving flowers with symbolic meanings and creative bouquet-making In order to convey personal and emotional messages. This Is not entirely accurate: floriography was a theoretical floral code based on the Turkish practice of selam, which the British and French upper class reinterpreted and edited to create their own version. This thesis examines how floriography functions semiotically, both as a mythologized language and as It was actually used, and traces the lineage of floral semiotics and greeting cards from Victorian Britain to contemporary America. I analyze floral semiotics, both …

Power & Planning: A Critical Comparison Of Tribal And Non-Tribal Wildfire Protection Plans, Christian J. Heisler

Student Research Symposium

In 2003, the US government passed the Healthy Forest Restoration Act, which urged wildfire-prone communities to develop Community Wildfire Protection Plans (CWPPs). These plans allow local groups to contextualize risk, practice social learning, and develop social capital while addressing wildfire risk. Within planning realms, however, decision-making power is usually concentrated unequally between social groups which can limit the influence of marginalized communities. Tribal nations, specifically, have been excluded from wildfire planning since European contact, signaling that CWPPs may not reflect Indigenous worldviews and priorities. Given the recent push from the federal government to increase land management collaboration with tribes, it …

Prosodic Analysis Of Wh-Indeterminate Questions In L2 Korean, Jung In Lee

Student Research Symposium

Wh-indeterminate questions, particularly wh-questions and yes-no questions, in Korean are ambiguous due to the limited morpho-syntactic markers in the sentence. The absence of these markers leaves two questions syntactically identical, leading to lexical ambiguity. The disambiguation of these two questions relies primarily on prosodic cues. Drawing from previous studies in the L1 Korean context, this study examines the intonation patterns of English learners of Korean in producing and perceiving wh-questions and yes-no questions and explores if there is any sign of L1 influence from English. Five English learners of Korean, who received formal instruction in Korean at a U.S. university, …

Community Resilience In Portland Parkland Soils, Jason W. Triefenbach

Student Research Symposium

Proposing soil nutrient testing as a model for community research and ecology education, this presentation considers pathways to raising public engagement with sustainability issues while enhancing community resilience and social capital. "Community Resilience in Portland Parkland Soils" represents my research thus far on the conjoined topics of urban soils and community efficacy, in which I have attempted to synthesize biogeophysical processes in city parklands with strategies for raising public awareness about urban ecosystems.

I measured and compared soil nitrogen levels at 8 iconic Portland area parks using commercially- available garden test kits, while concurrently researching the historical and contemporary land …

“Fruit From A Poisonous Tree”? Constituting Logics Of Law Enforcement Phlebotomy, Anne Johnson

Student Research Symposium

In at least 17 states in the United States, police are drawing blood from drivers they suspect of impairment. Despite concerns about civil rights, ethics of consent in custody, and use of force, law enforcement phlebotomy (LEP) remains critically understudied. Through 27 in-depth, semi-structured interviews with police phlebotomists and LEP program officials from 10 states, this study begins to fill that gap, asking: What are the logics of law enforcement phlebotomy? Constituting these logics–as articulated by police–are beliefs about both policing and phlebotomy, and officers’ motivations in the fight against impaired driving. This article assesses how the logics of law …

My Father's Story: An Ethnography About Language Loss, Ariel Wilsey-Gopp

Student Research Symposium

War disrupts everything, including a child’s developing language and cultural identity. My father grew up in both Serbia and Germany during the post-WWII political upheaval. By the time he was an adult, he knew five languages, yet lacked his own language and languaculture (Agar, 1994).

It benefits us to understand more completely the effects of language loss as political borders continue to shift and human migration increases. Research in social sciences, psychology, and biology all examine the effects of trauma, the brain, and child development. Applied linguistics examines language loss in relation to Second Language Acquisition (Altarriba & Heredia, …