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- All Subjects: Disease
- Creators: Collins, James
- Creators: Szeli, Eva
Description
One way pathogen prevalence is maintained is by persistence within reservoir host species. Reservoir hosts are species that do not show any signs of disease when a pathogen infects them. As a result, the pathogen survives and is able to remain in the host population. Batrachochytrium dendrobatidis (Bd) is a chytrid fungus that has caused extensive amphibian declines. It has been suspected that reservoir hosts are a key to Bd remaining in certain amphibian populations. I studied dragonfly naiads (Anisoptera spp.), the aquatic life cycle stage immediately following hatching and preceding the emergence of wings, as potential reservoir hosts for Bd on the Mogollon Rim in Arizona. On the Mogollon Rim winter temperatures fall below the optimal thermal range for Bd. Boreal chorus frogs (Pseudacris maculata), the most common amphibian species on the Rim, maintain subzero body temperatures to survive the winter. Since the optimal thermal range for Bd is between 4°C and 25°C, it is unlikely that Bd can grow on the skin of these frogs during winter. As a result, it is unknown how Bd prevalence is maintained in the area. Recent studies showed that Bd can grow in non-amphibian hosts. I hypothesized that Bd could grow within the digestive tracts of dragonfly naiads, since they stay in the water and don’t maintain subzero body temperatures during the cold winters on the Rim. Non-native and native naiads were both included in this study; the non-native naiads were purchased from a company in California while the native naiads were captured from ponds on the Mogollon Rim. The digestive tracts of the naiads were then dissected, and the DNA was extracted using an animal tissue spin-column protocol. The extracted DNA was analyzed by qPCR. The qPCR analysis of the native and non-native dragonfly naiads revealed that the samples were either Bd-negative or very weakly Bd-positive, with most being the former. Based on these results, it does not appear that naiads are biologically significant reservoir hosts for Bd.
ContributorsAnigwe, Christopher (Author) / Collins, James (Thesis director) / DeNardo, Dale (Committee member) / Brus, Evan (Committee member) / School of Life Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2018-05
Description
Highly publicized cases involving citizen fatalities due to police use of force raise questions about perceptions of danger. Arrest-related deaths due to weapons, accidental injuries, and natural causes remain high year after year. Communities are greatly affected, and mistrust with the police continues to increase when these situations happen. There seem to be inaccurate perceptions that may stem from implicit associations, stereotypes, and social learning. These psychological concepts may provide theoretical explanations of how decisions are made when police officers are faced with danger. Some elements of this decision-making process may include suspect characteristics, officer experience, and police sub-culture. In this review, race/ethnicity and socio-economic status are examined as factors that contribute to police use of force. Disparities in use of force data often involve young, Black males living in low-income neighborhoods. The stereotype that this group is more dangerous than others stems from underlying prejudices and previous situations where Black people are targeted more in certain areas. Training, education, and community outreach programs can assist in mending relations between police and affected communities. Acknowledging these inaccurate perceptions, making the adjustments to police training and community relations, and being open to exploration in future research of other minority groups will assist in eliminating prejudices and creating better connections between law enforcement and the community.
ContributorsGarcia-Johnson, Anastacia Maria (Author) / Szeli, Eva (Thesis director) / Pizarro, Jesenia (Committee member) / School of Criminology and Criminal Justice (Contributor, Contributor) / Department of Psychology (Contributor) / Barrett, The Honors College (Contributor)
Created2017-05
Description
Homeless populations are often disproportionately impacted by several diseases due to factors such as overcrowding, unsanitary conditions, lack of access to healthcare and most importantly lack of education. The purpose of this project was to decrease a part of this health gap by spreading awareness of certain illnesses impacting Arizona’s homeless population and to increase the use plausible prevention methods. This was done through the creation of three simplified brochures that contained information regarding influenza, hepatitis, and schizophrenia. Two surveys were distributed to a local homeless population; the first survey was given prior to handing out the brochures and the second survey was given a week later after the participants had some time to read the information from the brochures. The data from the surveys supported the goal of the project by showing an increase in overall awareness of the diseases as well as an increase in behavioral changes that would lead to the increase of plausible prevention methods.
ContributorsBanuelos, Jason (Author) / Quaranta, Kimberly (Thesis director) / Szeli, Eva (Committee member) / School of Life Sciences (Contributor) / Department of Psychology (Contributor) / Barrett, The Honors College (Contributor)
Created2020-05
Description
Amphibians around the world are suffering the effects of the chytrid fungus, Batrachochytrium dendrobatidis (Bd). Whenever amphibians are housed in captivity, they must go through a decontamination protocol to ensure they are not infected with diseases such as Bd. Itraconazole is the most commonly used fungicide used in these protocols. This study set out to determine if Bd could develop resistance or tolerance to itraconazole. Two 24 well plates were prepared with different concentrations of itraconazole with Bd zoospores added. Plate 1 had concentrations similar to what animals are currently being treated with in decontamination protocols. Plate 2 had concentrations at and below the published minimum inhibitory concentration values (MIC). Plate 1 displayed the ability of itraconazole to kill Bd sporangia with higher concentrations and Plate 2 showed that even under published MIC values, Bd still struggled to complete its reproductive cycle. I find the evolution of a resistant/tolerant strain of Bd unlikely given the efficacy of this drug, the sensitivity of Bd to itraconazole, and the lack of evidence of the completion of Bd’s reproductive cycle under the conditions used in this study.
ContributorsSommer, Bradley Dean (Author) / Collins, James (Thesis director) / Roberson, Robert (Committee member) / Brus, Evan (Committee member) / School of Life Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2019-05