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Articles 1 - 14 of 14
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Interests And Priorities In Sockeye Salmon Management: How Are Policies Enacted And Interpreted On Three Alaskan Rivers?, Jake P. Palazzi
Interests And Priorities In Sockeye Salmon Management: How Are Policies Enacted And Interpreted On Three Alaskan Rivers?, Jake P. Palazzi
University Honors Theses
The large export abundance of Alaskan salmon is well documented, and many studies have been performed to assess the economic and environmental viability of the industry and its management. Less research has been done to characterize how state intentions regarding fisheries allocation are conceived of by management or perceived by vulnerable groups in the user pool. This study seeks to qualitatively characterize the disconnect between state and Native Alaskan perceptions of management effectiveness, public interest, and Native Alaskan involvement using interviews. Results showed that Native Alaskan and state manager respondents had very different perceptions of management effectiveness and equity. When …
Lack Of Replication Disruption Following H2o2-Induced Damage In Escherichia Coli, Sierra S. Schmidt, Justin Courcelle, Charmain T. Courcelle
Lack Of Replication Disruption Following H2o2-Induced Damage In Escherichia Coli, Sierra S. Schmidt, Justin Courcelle, Charmain T. Courcelle
University Honors Theses
Hydrogen peroxide (H2O2) toxicity has long been thought to be predominantly due to oxidative DNA damage that can disrupt DNA replication and result in lethality. Curiously and contrary to this view, it is also well established that the glycosylases responsible for repairing oxidized-base damage are as resistant as wild-type cells when treated with H2O2. The observation raises the possibility that H2O2-induced DNA damage does not disrupt or prevent replication. To examine this possibility, I examined the sensitivity of recF mutants to H2O2. RecF is …
The Effects Of Neuron Degeneration And Methods Of Neurogenesis, Jesus I. Martinez
The Effects Of Neuron Degeneration And Methods Of Neurogenesis, Jesus I. Martinez
University Honors Theses
In the 1960’s, Joseph Altman discovered the creation of new neurons continues well into the adulthood of mammals. His work lay dormant for several decades possibly as a result of limitations in technology or the limited perceived usefulness at the time. In the 1990’s Altman’s discovery gained newfound interest and has stayed in researcher's interest ever since. A combination of improved imaging techniques, a continued shift in the public image of mental disorders, and a desire to aid those suffering from neurodegenerative disorders has led to many attempts to parse out the details of neurogenesis. After a number of studies …
The Role Of Redox Chemistry Of Disulfide Bonds In Cysteine Residues Of Membrane Proteins By Cuprous And Cupric Ions In Cell Death Of E. Coli, Morgan R. Stewart
The Role Of Redox Chemistry Of Disulfide Bonds In Cysteine Residues Of Membrane Proteins By Cuprous And Cupric Ions In Cell Death Of E. Coli, Morgan R. Stewart
University Honors Theses
The antimicrobial properties of copper have been thoroughly researched, but is still unclear what the actual mechanism of cell death is. This study explores the theory that copper ions and other copper sources act as an antibiotic for E. coli by cleaving the disulfide bonds of membrane proteins through redox chemistry, disrupting the cell membrane and causing cell death. The focus of this study is Cu(I) and Cu(II) interactions with the thiol containing amino acid, cysteine, and how these interactions may be responsible for copper’s toxicity. Cuprous ions have been found to be more toxic to E.coli than cupric …
Reviewing The Potential Link Between Grain-Free Diets And Dilated Cardiomyopathy In Canines, Larissa J. Webster
Reviewing The Potential Link Between Grain-Free Diets And Dilated Cardiomyopathy In Canines, Larissa J. Webster
University Honors Theses
Grain-free diets for dogs are becoming increasingly popular, but concerns are emerging following the FDA's recent investigation that there might be a link between grain-free diets and Dilated Cardiomyopathy (DCM) in dogs with no known genetic predisposition. Contrary to the majority of the public thought, dogs do nutritionally require grains, and there is rarely a medical reason to switch to a grain-free diet. Not all cases of DCM are linked to diet, and many dogs who are fed grain-free diets do not develop the disease; the extent of this issue therefore is not entirely known. This review aims to explore …
Long Term Effects Of Concussions And The Frequency Of Injury To The Different Regions Of The Human Brain, Marissa S. Swadener
Long Term Effects Of Concussions And The Frequency Of Injury To The Different Regions Of The Human Brain, Marissa S. Swadener
University Honors Theses
Concussions, or mild traumatic brain injuries, do not have a universally accepted definition but there are key features that the experts agree upon; most notably that they are caused by a direct blow, they cause functional disturbances, and that they cannot be explained by another injury or impairment. Most concussions are resolved within a few days but 10-20% have lingering effects that can last for years. In this study, frequency of lingering injury to each brain region was determined from data from thirteen studies and compared to Scheid et. al's frequency of short term injury by brain region using ANOVA …
A Methodological Review Of Resilience Approaches For Coral In The Face Of Climate Change, Gabriella L. Martinez
A Methodological Review Of Resilience Approaches For Coral In The Face Of Climate Change, Gabriella L. Martinez
University Honors Theses
A literature review of research on Resilience Based Management Theory, Aquaculture, and Assisted Gene Flow and Evolution being explored as possible methods to help the coral bleaching crisis.
A Survey Of Native Bees And Their Floral Use In Portland's Urban Orchards, Diandra L. Diamond
A Survey Of Native Bees And Their Floral Use In Portland's Urban Orchards, Diandra L. Diamond
University Honors Theses
Native bees are all around us, yet very few surveys have been performed on which bees reside in Portland, Oregon. For this honors thesis, native bees collected from two urban orchards and one botanical garden located in eastern Portland in 2018 and 2019 were identified to genus or to species, and their floral use recorded. This data will become part of the ongoing native bee survey being performed by Susan Masta's laboratory and the Museum of Natural History at Portland State University. The bees that were most commonly collected included Ceratina spp. (n = 42), Andrena spp. (n = 34), …
Screening For Candidate Genes Involved In Opioid Addiction In Reduced Complexity Cross Between B6j And B6nj, Jeya Aishwarya Anandakumar
Screening For Candidate Genes Involved In Opioid Addiction In Reduced Complexity Cross Between B6j And B6nj, Jeya Aishwarya Anandakumar
University Honors Theses
Drug overdose epidemic has worsened dramatically in the past 10 years. Opioid use disorder (OUD) is one of the biggest contributors to this rise. OUD has been a national public health and socioeconomic crisis. In 2017, the Center for Disease Control (CDC) has reported 47,600 opioid overdose deaths in the US alone. This amounts to 68% of all deaths due to drug overdose. Currently, 2.1 million Americans are suffering from OUD. The economic burden due to opioid misuse treatment was 171.7 billion US dollars in the year 2009 in the U.S. The projected cost in 2020 will be 280.5 billion …
Developmental Programming Effects Of Maternal Obesity, Carolle J. Kassab
Developmental Programming Effects Of Maternal Obesity, Carolle J. Kassab
University Honors Theses
Population studies within the United States indicate increasing rates of obesity, considerably prominent for women within reproductive age. Maternal obesity is associated with the offspring’s hyperlipidemia, diabetes, and cardiovascular disease, which have chronic consequences. Obesity in pregnancy causes metabolic and epigenetic perturbations within the fetal environment, disrupting future health of offspring. This phenomenon is known as developmental programming. Although the relationship between maternal undernutrition and developmental programming has been demonstrated, its relationship to maternal obesity remains understudied.
Genetic Diversity Correlates With Morphological Diversity Among Populations Of Achyrachaena Mollis, Rachel S. Bice
Genetic Diversity Correlates With Morphological Diversity Among Populations Of Achyrachaena Mollis, Rachel S. Bice
University Honors Theses
Biodiversity is important for ecosystem health and sustainability, especially in the current, rapidly changing climate. Understanding the underlying causes behind morphological variation will allow for more accurate predictions about how a population will respond to climate change, and potentially yield better natural resource management strategies. Achyrachaena mollis is an annual, self-fertilizing, range-limited, endemic species found in Northern California and Southern Oregon. This species depends primarily on wind seed dispersal for gene flow, making it a good study species in seed dispersal experiments. Additionally, A. mollis is more readily influenced by changes in its environment than a perennial due to its …
Proposal For Comparative Morphometrics Of Tübingen (Tu) And Tübingen Longfin (Tl) Zebrafish (Danio Rerio), Andrew Draper
Proposal For Comparative Morphometrics Of Tübingen (Tu) And Tübingen Longfin (Tl) Zebrafish (Danio Rerio), Andrew Draper
University Honors Theses
The TL strain of zebrafish (Danio rerio) originated from the TU strain, and differs in fin pattern with a phenotype predominated by increased fin length. Two genes are known to affect the phenotype: leo and lof. The pattern-affecting leo gene is not believed to affect the growth rate, development, or proportionality of the body. The lof gene does however result in significant increase in fin length compared to the wild-type phenotype of TU. Using populations from both TL and TU genetic strains, development was observed from 48 hours post fertilization through sexual maturity at 90 days post fertilization …
Post-Fire Changes In Interior Alaska's Vegetation Composition, Jannike E. Allen
Post-Fire Changes In Interior Alaska's Vegetation Composition, Jannike E. Allen
University Honors Theses
Global warming is altering the fire regime of interior Alaska, which may have cascading effects on the prevalence of forest types and species dominance across this region. Our objective was to investigate the relationship between vegetation composition and fire in the boreal forest of interior Alaska. We utilized data from over 700 plots sampled across the landscape designated as the Tanana region by the US Forest Service for Forest Inventory Analysis (FIA), as well as fire history records. We compared biomass and stem density of conifer and hardwood forest types, as well as individual tree species, across a gradient of …
Impact Of The Urban Heat Mosaic On The Leaf Senescence In Two Acer Species, Jeffrey D. Smith
Impact Of The Urban Heat Mosaic On The Leaf Senescence In Two Acer Species, Jeffrey D. Smith
University Honors Theses
Due to the heterogeneity of the urban heat island, we can think of the variable influence of urbanization on air temperature as more of an urban heat mosaic. Climate change has caused a resurgence of interest in the way temperature affects how organisms, such as street trees, undergo cyclic changes in their life cycle. Such changes include budburst or, less commonly, timing of senescence. Little is known about how the urban heat mosaic could be affecting the phenology of different urban trees. Because street trees are one of the more prominent ecosystem engineers of the urban landscape, variable influences of …