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Articles 1 - 12 of 12
Full-Text Articles in Physical Sciences and Mathematics
Cigarette Litter Leachates: A Statistical Study Of Elements In Freshwater And Saltwater, Cintly Guzman Hernandez
Cigarette Litter Leachates: A Statistical Study Of Elements In Freshwater And Saltwater, Cintly Guzman Hernandez
Honors Theses
Cigarette butts are the most common item found in coastal litter cleanups as approximately 4.5 trillion smoked cigarette butts are discarded into the environment every year. Cigarette butts can leach toxic heavy metals and nicotine along with other compounds from tobacco combustion. Past research in our lab has analyzed elements leached from cigarette butts into freshwater. The cigarette butts consisted of smoked and unsmoked butts that were soaked varying periods of time, and at different pH levels to identify the relationship of these variables to the amount of metal leached. The elements analyzed were Al, Ba, Cd, Cr, Cu, Fe, …
The Intersection Of Literacy And Digital Literacy: Incorporating Writing Standards With Computer Technology Standards, Grace Mcpherson
The Intersection Of Literacy And Digital Literacy: Incorporating Writing Standards With Computer Technology Standards, Grace Mcpherson
Honors Theses
This project aims to increase access to computer science/computer technology education by providing teachers resources to enable them to teach computer science/computer technology. A survey was taken to discover the interests and needs of teachers in Hamilton County, Tennessee. The project resulted in the creation of several lesson plans that integrate English and computer science through hands-on web development exercises, computational thinking opportunities, and critical thinking.
Quantifying The Effect Of Dietary Restriction On Lifespans In Saccharomyces Cerevisiae, Kathryn Rouse
Quantifying The Effect Of Dietary Restriction On Lifespans In Saccharomyces Cerevisiae, Kathryn Rouse
Honors Theses
Dietary restriction (DR) increases lifespan in many organisms. The effect of DR is best studied in the budding yeast Saccharomyces cerevisiae; however, previous studies of the DR effect on yeast lifespan tend to be qualitative. Here, we quantitatively study the effect of DR on lifespan for a selection of gene deletions in a 168-strain set of Saccharomyces cerevisiae. Lifespans of these yeast mutants were measured in YPD with 2% glucose and 0.05% glucose conditions. To quantify the aging process and its influence by DR, we fit yeast lifespan data with a three-parameter network aging model that is informative of the …
Evaluation Of Blight Resistance In Chestnut F2 Half-Sibling And Full-Sibling Families Via Small Stem Assay, Kevin Gentner
Evaluation Of Blight Resistance In Chestnut F2 Half-Sibling And Full-Sibling Families Via Small Stem Assay, Kevin Gentner
Honors Theses
In 1904, Cryphonectria parasitica, the causal agent for chestnut blight, was imported into North America on chestnut nursery stock from China. Fifty-five years later, nearly all full-grown wild American chestnut trees (Castanea dentata) were dead. A century of work has been put into restoring the American chestnut to its rightful place among the forest canopy. Since the 1980s, The American Chestnut Foundation has pursued backcross breeding to introgress blight resistance into C. dentata from the resistant Chinese species (C. mollissima), and has used progeny testing to make predictions about parental resistance in B3F2 chestnuts. We performed a small stem assay …
An Explicit Formula For Dirichlet's L-Function, Shannon Michele Hyder
An Explicit Formula For Dirichlet's L-Function, Shannon Michele Hyder
Honors Theses
The Riemann zeta function has a deep connection to the distribution of primes. In 1911 Landau proved that, an explicit formula where ρ = β + iγ denotes a complex zero of the zeta function and Λ(x) is an extension of the usual von Mangoldt function, so that Λ(x) = log p if x is a positive integral power of a prime p and Λ(x) = 0 for all other real values of x. Landau’s remarkable explicit formula lacks uniformity in x and therefore has limited applications to the theory of the zeta function. In 1993 Gonek proved a version …
Conservation And Collection Of Castanea Dentata Germplasm In The South, Trent Deason
Conservation And Collection Of Castanea Dentata Germplasm In The South, Trent Deason
Honors Theses
The American chestnut, Castanea dentata, has been devastated by the exotic invasive pathogens Cryphonectria parasitica and Phytophthora cinnamomi to which it has no resistance. The American Chestnut Foundation (TACF) has developed an interspecific backcross breeding program to introgress disease resistance from Asian chestnut species, primarily Castanea mollissima, into C. dentata hybrid populations. The genetic base of this program can be expanded by utilizing vegetative propagation through grafting in order to collect and conserve American chestnut individuals not amenable to traditional breeding. As the majority of the surviving American chestnuts are confined to the understory, they are shaded out by the …
Parental Care, Offspring Abandonment, And Filial Cannibalism, Mackenzie Davenport
Parental Care, Offspring Abandonment, And Filial Cannibalism, Mackenzie Davenport
Honors Theses
Parental care is a fundamental life-history trait that is found in many animals (reviewed in Royle et al. 2012). Parental care can include behaviors such as egg cleaning (Knouft et al. 2003), egg guarding (Royle et al. 2012, pg. 4), egg provisioning (Simmons & Parker 1989; Hilker & Meiners 2002; Royle et al. 2012, pg. 2), and oviposition-site selection (Refsnider & Janzen 2010). Such forms of parental care typically result in the spatial clumping of parents and their offspring. This often leads to density effects on within-clutch egg mortality, meaning that when within-clutch egg density increases, egg mortality also increases. …
Changes In Ant Biodiversity Across An Urban Gradient, Hao Brooks
Changes In Ant Biodiversity Across An Urban Gradient, Hao Brooks
Honors Theses
There are two aims to this study: compare diversity across an urban gradient and across seasons. We deployed traps and identified the collected 12 ant species at nine different sites centered at Chattanooga, Tennessee, for the purpose of relating levels of urbanization to the diversity of ant species at each site. We successfully sampled in the summer (June 27, 2017) and spring (March 31, 2018), and unsuccessfully sampled in winter (Feb. 16, 2018) when we collected zero ants, likely due to cold soil temperatures. To quantify “urbanization” we divided the sites into “Urban” core verses surrounding “Suburban” area using a …
Characterization Of Metamorphic Zones In The Tennessee Blue Ridge Using Gis And Digital Imaging Processing, Hayley Beitel
Characterization Of Metamorphic Zones In The Tennessee Blue Ridge Using Gis And Digital Imaging Processing, Hayley Beitel
Honors Theses
The origin of metamorphic zones of the Blue Ridge is attributed to metamorphic events that affected sedimentary rocks of debated age, leading the topic to be controversial and continuously studied. The present study seeks to refine the metamorphic isograds of the Tennessee Blue Ridge based on Barrovian index minerals in pelitic rocks and the texture patterns these pelitic rocks present. Methods used in the present study are supported by conventional petrography, powder X-ray diffraction, and by GIS and digital image processing. Metamorphic isograds in the Blue Ridge have been determined mainly by identification of index minerals using a polarizing petrographic …
Sds-Page Analysis Of Modified Lysozyme By Substituted Benzoquinones And Naphthoquinones, Neethu Kurien
Sds-Page Analysis Of Modified Lysozyme By Substituted Benzoquinones And Naphthoquinones, Neethu Kurien
Honors Theses
Quinones are molecules that are commonly found in the environment, as cofactors for proteins or an electron carrier in the mitochondrial electron transport chain. However, quinones also can come from polycyclic aromatic hydrocarbons as their metabolites, harming cellular integrity. In this study, we investigated protein modification of lysozyme in the presence of substituted benzoquinones and naphthoquinones. To simulate physiological conditions, all reactions used phosphate buffer (50.0 mM). While the majority of the experiments were performed at 37 C and pH 7.0, there were also temperature dependence (27 C and 42 C) and pH dependence (6.0 and 8.0) reactions included. SDS-PAGE …
Implementing Early Screening Methods To Detect Resistance To Phytophthora Cinnamomi In Backcross Chinese-American Chestnut Hybrids, Kirsten Hein
Honors Theses
Phytophthora root rot (PRR), caused by the oomycete Phytophthora cinnamomi Rands., is one of the two greatest obstacles to survival of American chestnut (Castanea dentata Borkh.). The other is chestnut blight, caused by the ascomycete Cryphonectria parasitica (Murr.) Barr. Developing early and reliable PRR screening methods can facilitate the efficient introgression of PRR resistance from Chinese chestnut (C. mollissima Blume.) into the populations of potentially chestnut blight resistant trees currently under development by The American Chestnut Foundation (TACF). This study tests the efficacy of a method for early identification of PRR-resistant hybrid chestnuts in a greenhouse/nursery setting. The chestnut blight …
Phospholipid Membrane Remodeling Through Exogenous Fatty Acid Incorporation In Certain Bacterial Species, Josh Herndon
Phospholipid Membrane Remodeling Through Exogenous Fatty Acid Incorporation In Certain Bacterial Species, Josh Herndon
Honors Theses
Multi-drug resistant bacteria have become problematic in healthcare settings. Recent studies have documented the ability of some bacteria, such as Vibrio species, to assimilate exogenous fatty acids into their membrane phospholipids. Therefore, the current research was performed to determine whether the three virulent, multi-drug resistant bacteria Acinetobacter baumannii, Klebsiella pneumoniae, and Escherichia coli can remodel their cell membranes following exposure to a range of exogenous polyunsaturated fatty acids (PUFAs). Furthermore, we hypothesized that PUFAs would influence phenotypes associated with growth and virulence. Extracted phospholipids were examined by UPLC/MS analysis to confirm assimilation of exogenous PUFAs into the bacterial phospholipids. A. …