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Articles 121 - 128 of 128
Full-Text Articles in Biology
Meta-Analysis Of Melanoma Incidence In The United States: Demographic Variation And Relationship With Uv Index And Latitude, Charles Thomas Pritchard
Meta-Analysis Of Melanoma Incidence In The United States: Demographic Variation And Relationship With Uv Index And Latitude, Charles Thomas Pritchard
Honors Theses
A link between exposure to ultraviolet (UV) radiation and melanoma skin cancer formation has generally been accepted in the scientific community, but precise quantification of such a link into a predictive equation is difficult to find in scientific literature. It was the aim of this study to determine if a quantifiable relationship exists between UV exposure and melanoma rates in the United States. Prior to the initiation of this study, it was hypothesized that existing predictive equations using accumulated UV index and latitude for general skin cancer incidence (i.e., including both melanoma and non-melanoma skin cancers) in Chile would be …
Electromyography Of Mastication Muscles In College Athletes, John Ratliff
Electromyography Of Mastication Muscles In College Athletes, John Ratliff
Honors Theses
The purpose of this experiment was to determine if co-activation in enhanced neck muscles increased surface electromyography (sEMG) activity in the masseter while chewing with the 1st, 2nd, and 3rd molars. Sixteen football players from The University of Mississippi volunteered for this study. Football players were examined because they strengthen their neck 4 days a week to help prevent neck injuries and concussions. Participants' average body fat was 15.68% and average body mass was 100.69 kilograms showing that the participants were larger, muscular individuals compared to non student-athletes and represent a unique, study group. Participants performed maximum weight on a …
Octocoral Physiology: Calcium Carbonate Composition And The Effect Of Thermal Stress On Enzyme Activity, Hadley Pearson
Octocoral Physiology: Calcium Carbonate Composition And The Effect Of Thermal Stress On Enzyme Activity, Hadley Pearson
Honors Theses
Octocorals are a diverse group of organisms, and within the Caribbean they contribute substantially to coral-reef cover. In this thesis, two different studies performed on these marine organisms are detailed. In Section I, the percent calcium carbonate composition of several species was analyzed. Octocorals produce sclerites: calcium carbonate crystals that serve as the skeletal elements of the coral. Determining the percent calcium carbonate composition of eight Caribbean octocoral species can give comparative insight into the form and function in these animals. This study also offers clues about potential evolutionary tradeoffs between rigidity and flexibility, as well as establishes some basic …
Bacteria Con Leche: Bacterial Populations And Antibiotic Resistance Within Conventional, Usda Organic, And Local Milk, Kristen M. Wilson
Bacteria Con Leche: Bacterial Populations And Antibiotic Resistance Within Conventional, Usda Organic, And Local Milk, Kristen M. Wilson
Honors Theses
Concerns over food production and processing, along with increasing outbreaks of foodborne illnesses and antibiotic resistant infections have led many consumers to seek alternative food sources in the organic and local food markets. This study compared conventional, USDA certified organic, and local farmer's market milk types to determine whether there is any noticeable benefit to purchasing organic or locally harvested milk in terms of their bacterial populations and level of antibiotic resistance. Samples from various milk types were plated on Tryptic Soy Agar and Milk Agar plates to enumerate bacteria, and the cultivated bacteria tested for resistance to the antibiotics …
Evaluation Of Microbial Diversity Present In Herbal Supplements As Revealed By Pcr-Based 16s Sequence Analysis, Stephen Stone
Evaluation Of Microbial Diversity Present In Herbal Supplements As Revealed By Pcr-Based 16s Sequence Analysis, Stephen Stone
Honors Theses
Over the last few decades people have become more aware of their general wellness and have turned towards alternative measures to ensure good health. One of these alternative measures, the herbal supplement market, has risen significantly in recent years, even though there is no conclusive research that points to the effectiveness of herbal supplements. Also, because of sparse regulation from the FDA, there are many questions related to the efficacy, composition, processing methods, and, consequently, safety of these supplements. The aim of this study was to determine the microbial composition of herbal supplements in an attempt to identify potential targets …
Dna-Based Species Identification And Population Genetics Of The Eastern Subterranean Termite, Reticulitermes Flavipes, In The Southern Appalachian Mountains, Benjamin Collins
Dna-Based Species Identification And Population Genetics Of The Eastern Subterranean Termite, Reticulitermes Flavipes, In The Southern Appalachian Mountains, Benjamin Collins
Honors Theses
This study investigates the distribution patterns of Reticulitermes flavipes, an important recycler of nutrients and well-known destroyer of man-made structures, in the Southern Appalachian Mountains. As a precursor to this work, it was first necessary to distinguish the target species from other co-occurring termite species. To combat this problem, a modified Polymerase Chain Reaction- Restriction Fragment Length Polymorphism (PCR-RFLP) assay that uses a 384-bp segment of the mitochondrial cytochrome oxidase subunit II (COII) gene was designed. To test the accuracy of this tool, predictions made from using this method were compared to predictions made by genetic sequencing. This modified PCR-RFLP …
Reduced Density Of Calbindin Immunoreactive Gabaergic Neurons In Major Depressive Disorder: Relevance To Neuroimaging Studies And Future Directions, Jonathan Hughes
Reduced Density Of Calbindin Immunoreactive Gabaergic Neurons In Major Depressive Disorder: Relevance To Neuroimaging Studies And Future Directions, Jonathan Hughes
Honors Theses
Background: Several lines of evidence suggest dysfunction of the γ-aminobutyric acid (GABA)ergic system in major depressive disorder. Neuroimaging studies report reduced levels of GABA in the dorsolateral prefrontal and occipital cortex of depressed patients. Our previous postmortem study re-vealed a reduction in the density and size of calbindin-immunoreactive (CB-IR) GABAergic neurons in the prefrontal cortex in major depressive disorder. The goal of this study was to test whether the changes in CB-IR neurons can also be detected in the occipital cortex, where neuroimaging studies report a prominent GABA decrease. Methods: A three-dimensional cell counting probe was used to assess the …
Comparative Population Dynamics Of Freshwater Dinoflagellates Of The Genera Peridinium And Peridiniopsis, Andy Canion
Comparative Population Dynamics Of Freshwater Dinoflagellates Of The Genera Peridinium And Peridiniopsis, Andy Canion
Honors Theses
Freshwater dinoflagellates, like their marine relatives, have the potential to reach large population sizes known as blooms. Though they are not toxic like some marine forms, freshwater blooms may have a large impact in their respective ecosystem. This study investigated the temporal and spatial changes in population density of four Peridinium species (P. deflandrei, P. volzii, P. wisconsinense, and P. limbatum) and one Peridiniopsis species (Peridiniopsis polonicium) in Boondoggle Lake, a shallow lake (4.5 m) in northern Mississippi (Lafayette Co.). On each sampling date, measurements of the abiotic environment were made, including dissolved oxygen, temperature, pH, and turbidity. Also, water …