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Geochemical Modeling of the Yellowstone Mixing Zone

Description

In this study, the influence of fluid mixing on temperature and geochemistry of hot spring fluids is investigated. Yellowstone National Park (YNP) is home to a diverse range of hot springs with varying temperature and chemistry. The mixing zone of interest in this paper, located in Geyser Creek, YNP, has been a point of interest since at least the 1960’s (Raymahashay, 1968). Two springs, one basic (~pH 7) and one acidic (~pH 3) mix together down an outflow channel. There are visual bands of different photosynthetic pigments which suggests the creation of temperature and chemical gradients due to the fluids mixing. In this study, to determine if fluid mixing is driving these changes of temperature and chemistry in the system, a model that factors in evaporation and cooling was developed and compared to measured temperature and chemical data collected downstream. Comparison of the modeled temperature and chemistry to the measured values at the downstream mixture shows that many of the ions, such as Cl⁻, F⁻, and Li⁺, behave conservatively with respect to mixing. This indicates that the influence of mixing accounts for a large proportion of variation in the chemical composition of the system. However, there are some chemical constituents like CH₄, H₂, and NO₃⁻, that were not conserved, and the concentrations were either depleted or increased in the downstream mixture. Some of these constituents are known to be used by microorganisms. The development of this mixing model can be used as a tool for predicting biological activity as well as building the framework for future geochemical and computational models that can be used to understand the energy availability and the microbial communities that are present.

ContributorsOrrill, Brianna Isabel (Author) / Shock, Everett (Thesis director) / Howells, Alta (Committee member) / School of Life Sciences (Contributor) / School of Earth and Space Exploration (Contributor) / Barrett, The Honors College (Contributor)

Created2021-05

Breast Health Seeking Behaviors In Countries With Varying Health Coverage

Description

There is an enormous unmet need for services, education, and outreach to improve women’s breast health. Healthcare systems and insurance systems vary widely around the world, and this may play an important role in understanding variability in women’s breast health knowledge and behavior globally. The goal of this study is to determine how varying healthcare systems in three countries (Japan, Paraguay, US) affect a woman’s likelihood of seeing a physician in regard to their breasts. For example, Japan is a clear example of a region that provides universal health insurance to its citizens. The government takes responsibility in giving accessible and equitable healthcare to its entire population (Zhang & Oyama, 2016). On the other hand, a country such as Paraguay is composed of both public and private sectors. In order for citizens to gain insurance, one would have to either be formally employed or choose to pay out-of-pocket for hospital visits (“Paraguay”, 2017). A country such as the United States does not have universal health insurance. However, it does have a mix of public and private sectors, meaning there is little to no coverage for its citizens. To accommodate for this, the United States came up with the Affordable Care Act, which extends coverage to the uninsured. Although the United States might be a country that spends more on healthcare than any other nation, there are residents that still lack healthcare (De Lew, Greenberg & Kinchen, 1992). This study, then, compares women’s breast health knowledge and behavior in Japan, Paraguay, and the US. Other variables, which are also considered in this study, that might affect this include wealth level, education, having general awareness of breast cancer, having regular health checks, and having some breast education. Using statistical analysis of breast check rates of women in Japan, Paraguay, and the United States, this research found that women sampled in Asunción, Paraguay check their breasts more often than either women sampled from Scottsdale, U.S. or Osaka, Japan. It was also found that women sampled from Paraguay were more confident in detecting changes in their breast compared to women sampled from the Japan or the US. Finally, it was noted that women sampled from Japan were least likely to partake in seeing a doctor in concern of changes in their breasts compared to women sampled from the other two research locations. These findings have relevance for the implementation of advocacy and public education about breast health.

ContributorsKumar, Navneet Surjit (Co-author) / Kumar, Navneet (Co-author) / Wutich, Amber (Thesis director) / Brewis, Alexandra (Committee member) / School of Human Evolution & Social Change (Contributor) / School of Life Sciences (Contributor) / Barrett, The Honors College (Contributor)

Created2020-05