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Articles 391 - 420 of 498
Full-Text Articles in Biology
An Evaluation Of Soil Extracellular Enzyme Activity In Response To Burning As A Forest Restoration Technique, William M. Steward
An Evaluation Of Soil Extracellular Enzyme Activity In Response To Burning As A Forest Restoration Technique, William M. Steward
Honors Theses
Burning is a method of forest restoration with the goal of returning natural tree species to ecosystems. Burning has a wide range of effects on an ecosystem, including the alteration of important soil processes and characteristics. One of the key components of soil is the activity of extracellular enzymes, which can be used to provide insight into the nutritional requirements of soil microbes as well as nutrient availability and cycling. Because enzymes are important in the overall functioning of soil and can be used to assess soil health, there is great need to examine the effects of burning on soil …
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 …
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 …
Investigation Of Bax Vdac Interactions And Their Relationship Regarding Apoptosis In Drosophila Melanogaster, John Sullivan
Investigation Of Bax Vdac Interactions And Their Relationship Regarding Apoptosis In Drosophila Melanogaster, John Sullivan
Honors Theses
Cell mediated death, or apoptosis, is a critical biological process that once fully understood could unlock a potentially new understanding of the mechanisms of both cancer and neurodegenerative diseases. The general mechanism of apoptosis includes cytochrome c being released from the mitochondrial membrane through a channel created by an activated pro-apoptotic BH123 protein. Once the cytochrome c leaves the mitochondrial membrane it goes on to ultimately activate a caspase cascade, which results in cell apoptosis. Similar to BH123 channels, VDACs (voltage-dependent anion channels) are also pore-forming proteins that regulate the intake and output of metabolites from the mitochondrial intermembrane space …
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 …
Preliminary Investigations Into The Population Genetics Of The Horned Passalus Beetle, Odontotaenius Disjunctus (Coleoptera), In Forests Of The Southeastern United States, Rachel Yi
Honors Theses
As a major hotspot of biodiversity, the Appalachian Mountains have been a source of great interest for ecologists in many ways. The mountains' north-south orientation, varying degrees of elevation and environmental conditions, and historical cycles of glacial encroachment have been thought to contribute to this unusual level of population variation. As such, population genetic studies of species have been a growing area of investigation. Phylogeography, the study of how historical processes could lead to current geographic distributions of individuals and populations of a species, is a particularly prominent direction. The focus of this study examines the horned passalus and its …
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 …
Attempts To Determine The Community Structure Of Archaea In Major Tributaries Of The Mississippi River, Thomas Douglas Bateman
Attempts To Determine The Community Structure Of Archaea In Major Tributaries Of The Mississippi River, Thomas Douglas Bateman
Honors Theses
Archaea were once thought to be limited to extreme environments, but it has now been established that they are found in diverse ecosystems worldwide. Archaea may possess distinctive properties that affect biogeochemical processes, which makes understanding their distribution crucial in determining their effect on these processes. Little research has been done on the ecology of Archaea in rivers, and this study represents the first attempt to gain an understanding of the diversity of Archaea within major tributaries of the Mississippi River. Polymerase Chain Reaction (PCR) amplification of archaeal DNA and denaturing gradient gel electrophoresis (DGGE) was used to examine community …
Simulated Diabetes Testing Experiment Using Artificially Manipulated Livestock Blood, Hollie E. Ables
Simulated Diabetes Testing Experiment Using Artificially Manipulated Livestock Blood, Hollie E. Ables
Honors Theses
Due to the prevalence of diabetes and lack of simple endocrine experiments, a laboratory protocol was developed in order to increase student knowledge of the disease and the diabetic testing process. In this paper, we present the protocol for manipulating the glucose concentration of commercially available bovine blood. The bovine blood was manipulated using Ringer's solution to which glucose was added, and six samples were prepared (pre-prandial and postprandial, normal; pre-prandial and postprandial, pre-diabetic; pre-prandial and postprandial, diabetic). This laboratory exercise provides a physical, hands-on student activity that highlights pancreatic endocrinology and the results of pancreatic malfunction. The laboratory exercise …
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 …
Understanding The Karoo: Investigating The Function Of A Copulation Call In Female Wild Turkeys Meleagris Gallopavo, Callie Grey
Understanding The Karoo: Investigating The Function Of A Copulation Call In Female Wild Turkeys Meleagris Gallopavo, Callie Grey
Honors Theses
Even with the vast amount of research regarding mating vocalizations and their adaptive functions, the copulation call of female wild turkeys, Meleagris gallopavo, has yet to be described. The purpose of this study was to describe this novel call, referred to as karoo and to test three hypotheses for its function. Previously collected data in the form of video tapes and data sheets provided the basis of this study. Dr. Richard Buchholz conducted experimental trials in 2008 and 2009. Male behavioral data was recorded on the videos. The videos and the data sheets were used to collect female behavioral data. …
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 …
Cleft Lip And Palate Repair: Bridging The Gap Between Genetics And Oral Health: An Individual Case Study, Duncan Perry
Cleft Lip And Palate Repair: Bridging The Gap Between Genetics And Oral Health: An Individual Case Study, Duncan Perry
Honors Theses
Cleft Lip and Palate Syndrome (CL/P) is a condition that occurs in vitro, during fetal development. Because the majority of CL/P cases occur in underdeveloped nations, the families of CL/P patients are typically characterized by impoverished homes. These are the very people who cannot afford to pay for folic acid supplements, or reconstructive and reparative surgeries. Many families struggle under the extreme pressure of raising a child with CL/P. In these nations, the child often cannot receive the proper care they need, and usually are the product of unsuccessful surgeries. The stress of a CL/P patient is incredibly high, both …
Alzheimer's Disease And Circadian Rhythms In A Drosophila Model, Lauren Alejo
Alzheimer's Disease And Circadian Rhythms In A Drosophila Model, Lauren Alejo
Honors Theses
Sleep disorders are commonly reported in Alzheimer's disease, a debilitating, age-related neurodegenerative disorder that affects neurons in the brain. Recently, several studies have suggested a role for sleep abnormalities and the internal "body clock" known as the circadian system, in the disease onset and progression. Since most of the data has been collected from mammals with complex neural circuitry, the molecular and cellular mechanisms that integrate the two neural networks are still limited. This study examined the relationship between circadian rhythmicity and Alzheimer's Disease presentation using a Drosophila model. Flies were crossed using the GAL4-UAS system to display Alzheimer's disease …
Functional Response Of Venus Flytraps (Dionaea Muscipula), Amber D. Martin
Functional Response Of Venus Flytraps (Dionaea Muscipula), Amber D. Martin
Honors Theses
The feeding response of Venus flytraps (Dionaea muscipula) is widely studied, and many studies have considered the selectivity of prey capture in D. muscipula (Lichtner and Williams, 1977; Hutchens and Luken, 2009). The consumption rate of an organism relative to the abundance or availability of its food is known as that organism's functional response (Jeschke et al., 2004). In this study, a functional response curve will be constructed for D. muscipula based on its response to increasing availability of small prey in the laboratory. Knowledge of functional responses is important for various fields of biology including population biology, evolutionary biology, …
Seed Bank Study Of The Effect Of Land Use On Vegetation Diversity In Carolina Bays, Maeve Snyder
Seed Bank Study Of The Effect Of Land Use On Vegetation Diversity In Carolina Bays, Maeve Snyder
Honors Theses
The intent of my honors thesis is to conduct a comparative analysis of seed banks between Carolina bays of high and low human impact. My study will use Geographic Information Systems (GIS) to characterize types of land use within Carolina bays and in 250-m buffer zones. Representative bays from high-impact and low-impact classifications will be chosen as study sites, and seed bank samples will be collected and germinated. While it is beyond the scope of my study to identify a mechanism by which it occurs, I will investigate the presence of a relationship between land use and bay vegetation biodiversity.
Effectiveness Of Gaming Systems On Balance In Older Individuals, Mary E. Anderson
Effectiveness Of Gaming Systems On Balance In Older Individuals, Mary E. Anderson
Honors Theses
Balance training using gaming systems, called exergaming, is a rising trend for reducing fall risk in older individuals. Previous studies have conducted research pertaining to gaming systems and traditional balance training, however there is a lack of comparison between gaming systems. This study was performed to determine the effectiveness of two gaming systems, the Wii Fit and Xbox Kinect, as compared to traditional balance training. This study was performed with subjects (N=5) over the age of 65, in good health, randomly placed in one of the three balance training groups: Wii Fit (n=2), Xbox Kinect (n=2), and Traditional balance training …
Prey Capture In Response To Removing Cilia From Venus Flytraps, Emily Marchini
Prey Capture In Response To Removing Cilia From Venus Flytraps, Emily Marchini
Honors Theses
Carnivorous plants are able to attract, trap, and digest insects. Different types of traps target different prey. There are sticky traps, pitfall traps, and active steel traps (Gibson, 1991). Although this may seem to be a rare modification it appears that there are six origins of carnivorous plants in different groups of angiosperms (Albert et al., 1992). These results indicate that not only were there multiple origins of carnivorous plants, there were also multiple origins of the same trapping mechanism; for example, the flypaper trap has five origins and the pitcher trap has three (Albert et al., 1992). Multiple origins …
Characteristics And Effects Of Muscular Dystrophy In Broiler Chickens, Kayla N. Smith
Characteristics And Effects Of Muscular Dystrophy In Broiler Chickens, Kayla N. Smith
Honors Theses
Muscular dystrophy is very common among broilers, which are chickens raised specifically for meat production. When dystrophic chickens are mated, or when normal and dystrophic chickens are mated, it is very likely that at least fifty percent of the clutch will end up with muscular dystrophy since it is inherited as a co-dominant disorder (Fujiwara et al., 2009). For my study, eggs were obtained from a local farm, and allowed to hatch. Among these hatchings were chicks who exhibited some traits of muscular dystrophy. It is possible that the parents of the seemingly dystrophic chicks may carry the mutated WWP1 …
Prevention Of Increasing Burnout Levels Among Physicians Of Different Specialties And Doctoral Degrees, Taylor Lewis
Prevention Of Increasing Burnout Levels Among Physicians Of Different Specialties And Doctoral Degrees, Taylor Lewis
Honors Theses
Burnout rates are steadily increasing among physicians all over the world (Sime, Quick, Saleh, & Martin, 2007). Burnout is defined as high levels of emotional exhaustion (EE), high levels of depersonalization (DP), and low levels of personal achievement (PA) (Ionita, Copotocan, & Copotoiu, S., 2011). These burnout rates are directly correlated with many factors, such as high levels of emotional exhaustion and stress (McManus, Winder, & Gordon, 2002), little experience in the medical field (Keswani, Taft, Coté, & Keefer, 2011), and long work hours which leads to sleep deprivation and fatigue (Jackson, 1999). These moderate to high levels of burnout …
Mitochondrial Dysfunction And Reactive Oxygen Species In Neurodegeneration, Leah Farina
Mitochondrial Dysfunction And Reactive Oxygen Species In Neurodegeneration, Leah Farina
Honors Theses
Neurodegeneration leads to the loss of normal anatomy and physiology of the neuronal system in a human body. The hallmark of most neurodegenerative diseases is abnormal folding and accumulation of proteins within neuronal cell bodies that is not present in healthy people. These changes in normal protein metabolism often lead to neuronal cell death and failure of the affected regions of the central nervous system. Abnormal protein accumulation may be attributed to dysfunctional mitochondria and damage by reactive oxygen species. In addition to causing altered protein accumulation, dysfunctional mitochondria and an excess of reactive oxygen species also lead to errors …
Mechanisms Of Neuroprotection Against Retinal Ganglion Cell Loss Using An In Vivo Glaucoma Model, Kevin Heinze
Mechanisms Of Neuroprotection Against Retinal Ganglion Cell Loss Using An In Vivo Glaucoma Model, Kevin Heinze
Honors Theses
Glaucoma is an incurable ocular disease characterized by apoptotic cell death and degeneration of retinal ganglion cells (RGCs), and is one of the leading causes of blindness worldwide (Quigley and Broman, 2006; Quigley et al., 1995). While current treatments are effective at slowing vision loss, glaucoma’s multifactorial etiology has made it difficult for researchers to identify a target for treatment that will permanently halt RGC degeneration. Previous studies have proposed a glutamate-induced excitotoxic mechanism of RGC death in glaucoma, and neuroprotective agents have been investigated to prevent this effect. One agent, acetylcholine, has been shown to initiate pro-survival signaling cascades …
Developmental Expression Profile Of Bric Á Brac 2, Midline And H15 In The Developing Eye And Central Nervous System Of Drosophila Melanogaster, Petra Visic
Honors Theses
Aberrant activity of a single gene can lead towards development of cancerous cells. Drosophila melanogaster is a useful model system to study cancer because there is high degree of evolutionary conservation in signaling pathways between humans and flies that play major roles in regulating cell proliferation and growth (Miles et al., 2011). At The University of Southern Mississippi (USM), Dr. Leal’s lab has gathered evidence suggesting that bab1 and bab2 interact with the T-box gene midline (mid) and its paralog H15, while the early developmental function of bab1 and bab2 remains unknown. That is why elucidating the early …
The Investigation Of Risk Factors For Upper Respiratory Infections Among College Students, Romie Barnes
The Investigation Of Risk Factors For Upper Respiratory Infections Among College Students, Romie Barnes
Honors Theses
Upper respiratory tract infections and cold-like illnesses are common sources of morbidity among college students. The emphasis of hand-washing and reducing the dispersal of aerosol droplets by covering coughs and sneezes reduces the spread of the common cold. However, less emphasis is placed on other risk factors for reducing cold-like illness such as: stress level and physical activity (Doyle and Cohens 2009). An increase in stress and a decrease in physical activity are common among college students (Nichol et al 2005). For this reason, the present study analyzed the effects of stress and physical activity on the incidence of upper …
Potent Mutagens Have Positive And Negative Effects On Viral Fitness Of Reovirus In Vitro, Jennie Altman
Potent Mutagens Have Positive And Negative Effects On Viral Fitness Of Reovirus In Vitro, Jennie Altman
Honors Theses
Due to the inherently error-prone nature of RNA replication, mutations to genomes of RNA viruses occur frequently and accumulate. We hypothesized that RNA versions of nucleoside analogues that increase mutation rates in DNA could cause increases in the mutation rate of a model RNA virus, Reovirus, and decrease the fitness of the virus in vitro due to the accumulation of deleterious mutations. After conducting multiple passages of Reovirus in mouse L929 cells in the presence of these potential RNA mutagens in four separate trials, there were not only virus samples with the expected decreased infectivity, but surprisingly, samples with marked …
Prenatal Choline Supplementation And Mk-801 Toxicity: Protecting Memory And Preventing Neurodegeneration, Chelsea Nickerson
Prenatal Choline Supplementation And Mk-801 Toxicity: Protecting Memory And Preventing Neurodegeneration, Chelsea Nickerson
Honors Theses
Choline is essential to the development and function of the central nervous system. Supplemental choline is neuroprotective against a variety of insults, including neurotoxins like dizocilpine (MK-801). MK-801 is an NMDA receptor antagonist that is frequently used in rodent models of psychological disorders. At low doses, it causes cognitive impairments, and at higher doses it induces motor deficits, anhedonia, and neuronal degeneration. The primary goals of the present study were to investigate whether prenatal choline supplementation protects against the cognitive impairments, motor deficits, and neuropathologies that are precipitated by MK-801 administration in adulthood. Adult male Sprague Dawley rats were fed …
Investigating The Role Of Epibiotic Bacteria In Defense Against Chytridiomycosis In The Green Frog, Lithobates Clamitans, Sarah Nalven
Investigating The Role Of Epibiotic Bacteria In Defense Against Chytridiomycosis In The Green Frog, Lithobates Clamitans, Sarah Nalven
Honors Theses
Amphibian populations have been declining for several decades, in part due to the emerging fungal skin disease, chytridiomycosis, caused by the chytrid fungus Batrachochytrium dendrobatidis (Bd). Chytridiomycosis has caused extinctions and extirpations in many parts of the world, but its influence varies across species, populations, and individuals. The Green Frog (Lithobates clamitans), which inhabits the eastern half of the United States, seems capable of sustaining Bd infections without experiencing die-offs. It is possible that the Green Frog's epibiotic bacteria are contributing to its defense against Bd as the epibiotic bacteria of several amphibian species are known to play …
Spatial And Seasonal Signals In Stable Isotopes Of Incisor Enamel From Free-Ranging, Thirteen-Lined Ground Squirrels, Jacob Andrew Brassington
Spatial And Seasonal Signals In Stable Isotopes Of Incisor Enamel From Free-Ranging, Thirteen-Lined Ground Squirrels, Jacob Andrew Brassington
Honors Theses
From early May through late September, 2012, we captured, tagged, and collected body masses from multiple, free-ranging thirteen-lined ground squirrels (Ictidomys tridecemlineatus) in southwestern Michigan, with 14 individuals recaptured 1 or more times through the season. Beginning in mid-June, we captured and euthanized 12 or these individuals (on average, about 1 per week) to allow study of their lower incisors. We serially micro-sampled enamel along squirrel incisors using laser ablation and determined stable isotope ratios (d13 and d18 O) with gas chromatography-isotope-ratio mass spectrometry (GC-IRMS). The resulting values fell into two spatial groups. Specimens collected within 25 m of a …
Light Intensity And Time Of Day Influence Female Acheta Domesticus Phonotaxis, John Hyun-Sik Ahn
Light Intensity And Time Of Day Influence Female Acheta Domesticus Phonotaxis, John Hyun-Sik Ahn
Honors Theses
Positive phonotaxis occurs when a female cricket walks toward the source of an auditory stimulus. This study tested the effects of light intensity and time of day on phonotaxis of female Acheta domesticus. First, females were tested at four times of day; second, under three light intensities; and third, under four combinations of light intensity and time of day. Our results show that these two factors combined exert a more pronounced effect on female A. domesticus selectivity than either factor individually, and subsequent research will test these factors against the current neuronal model for SP-selective phonotaxis.
The Debate On Marine Mammals In Captivity, Lorna C. Scribner
The Debate On Marine Mammals In Captivity, Lorna C. Scribner
Honors Theses
Are marine mammal species better off today because of captivity? Is captivity ethical and should it be continued? As this debate grows stronger, both of these sides of the argument offer substantial evidence in their favor. In this paper, I discuss data for both sides and evaluate the justifications of marine mammal captivity. Ideally, no matter the outcome, this research will educate the public on influential factors of wild and captive populations.