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Microbial Transformation Of 3-Nitro-4-Hydroxybenzene Arsonic Acid (Roxarsone), Bryan Crable

Electronic Theses and Dissertations

Land application of chicken litter from production houses that use the organoarsenical 3-nitro-4-hydroxybenzenearsonic acid (roxarsone) results in deposition of significant quantities of arsenic into United States soil each year. Used widely as a feed additive in the poultry industry, roxarsone was originally thought to be stable in the environment. However, recent evidence from our lab, as well as others, has established that this benign compound is readily transformed via several intermediates into inorganic arsenate. While microbial activity has been implicated in this process, there is no direct evidence suggesting the specific processes or the organisms involved.

Using a physiological and …

African American Perceptions Of Childhood Behavioral Disorders And Mental Health Services, Chant Wellington

Electronic Theses and Dissertations

This dissertation investigated African American parents/caregivers perceptions of childhood psychopathology and psychological services. The four participants of this study were African American parents/caregivers of children who were suspected by their respective schools of having symptoms of emotional, cognitive and or behavioral disorders. The researcher of this study asked these participants to describe their lived experiences of their children's functioning that school based evaluators consider atypical.

Data were obtained in the form of an initial phone interview. At a later date a face to face follow-up interview was audio taped and transcribed in order to obtain situated and general narratives.

Findings …

Fear, Faith And The Fatherland : The Complexities Of Prejudice In The Civil Rights Movement, Kate Medley

Electronic Theses and Dissertations

No abstract provided.

Accidental Inversion During 3d Rotation With 2-Dof Input Devices, Derek Daniel Diaz

Electronic Theses and Dissertations

This dissertation focuses on a human operator's ability to perform rotational control of a three-dimensional object using two-degrees of freedom (DOF) interface devices. Although input devices designed specifically for 3D interaction exist, devices traditionally used for two-dimensional user interaction, such as a mouse or joystick, have become ubiquitous to computer tasks. This research examines a particular human-computer interaction issue that arises from stimulus-response compatibility between three-dimensional stimuli spaces and 2-DOF response sets. The focal point of this research is a phenomenon referred to here as accidental inversion. Accidental inversions occur when an operator erroneously moves a three-dimensional object in a …

Production Of Polyhydroxyalkanoates By Ralstonia Eutropha Using Condensed Corn Solubles, Panchali Chakraborty

Electronic Theses and Dissertations

Polyhydroxyalkanoates (PHA) are biodegradable polymers that have widespread applications in pharmaceutical and food industry. The high cost of PHA production and extractions has limited its applications. The objective of this study was to use condensed com solubles (CCS), a low value byproduct of com ethanol production, as an inexpensive medium for growth of R. eutropha ATCC 17699 and production of polyhydroxyalkanoates at a reduced cost. This research study was divided into three parts. The fust objective was to develop the low cost CCS as a suitable medium for optimal growth of Ra/stonia eutropha. Various concentrations of the CCS medium (80, …

Stabel Isotope Turnover Rates And Diet-Tissue Discrimination In The Skin Of West Indian Manatees: Implcations For Evaluating Their Feeding Ecology And Habitat Use, Christy Alves

Electronic Theses and Dissertations

The West Indian manatee (Trichechus manatus) is an herbivorous marine mammal that occupies freshwater, estuarine, and marine habitats. Despite being considered endangered, relatively little is known about the feeding ecology of either of the two recognized subspecies, the Florida manatee (T.m. latirostris) and Caribbean or Antillean manatee (T.m. manatus). A better understanding of their respective feeding preferences and habitat use is essential to establish criteria on which conservation plans can be based. The present study expands on previous work on manatee feeding ecology by both assessing the application of stable isotope analysis to manatee tissue and providing critical baseline parameters …

Singlet Oxygen Generation Using New Fluorene-Based Photosensitizers Under One- And Two-Photon Excitation, Stephen James Andrasik

Electronic Theses and Dissertations

Molecular oxygen in its lowest electronically excited state plays an important roll in the field of chemistry. This excited state is often referred to as singlet oxygen and can be generated in a photosensitized process under one- or two-photon excitation of a photosensitizer. It is particularly useful in the field of photodynamic cancer therapy (PDT) where singlet oxygen formation can be used to destroy cancerous tumors. The use of two-photon activated photosensitizers possesses great potential in the field of PDT since near-IR light is used to activate the sensitizer, resulting in deeper penetration of light into biological tissue, less photobleaching …

Restoration Of Intertidal Oyster Reefs Affected By Intense Recreational Boating Activity In Mosquito Lagoon, Florida, Andrea Barber

Electronic Theses and Dissertations

In recent years, intertidal reefs of Crassostrea virginica (eastern oyster) along central Florida's east coast have suffered extensive losses due to wakes from recreational boats. These wakes have caused extensive shell movement and sediment resuspension which results in large piles of disarticulated shells along the seaward edges of reefs. Dead margins extend up to one meter above mean high water. The creation and enforcement of "no wake" zones in the area are unlikely. Thus, there is an urgent need for an alternative restoration strategy before these oyster reefs decline any further. The goal of this project was to develop a …

Effects Of Isolation On Metapopulation Dynamics In Small-World Networks, Alaina Brooke Bernard

Electronic Theses and Dissertations

Simulation models are valuable for making predictions that may be tested in natural systems and for understanding observed patterns. The simulation model developed for this thesis evaluates the effects of spatial network architecture, including organism dispersal patterns and isolation of habitats, on metapopulations. Two fields were merged throughout this project: metapopulation biology and small-world network theory. Small-world networks are characterized in their extremes as scale-free or single-scale. These models potentially simulate the networks of habitats and corridors in which metapopulations operate. Small-world network theory has been used to describe systems as diverse as rivers, the world-wide-web, and protein interactions, but …

Factors That Influence Transfer Of Hazardous Material Training: The Perception Of Selected Fire-Fighter Trainees And Supervisors, Divya Bhati

Electronic Theses and Dissertations

This study examined the influence of factors on transfer of training and was based on the work of Broad and Newstrom (1992). For the purpose of this study the Broad and Newstrom (1992) transfer of training barriers are rephrased into positive statements. The nine transfer of training factors are: (1) reinforcement on the job; (2) little interference from immediate (work) environment; (3) supportive organizational culture; (4) trainees' perception of training programs being practical; (5) trainees' perception of relevant training content; (6) trainees' being comfortable with change and associated effort; (7) trainer being supportive and inspiring; (8) trainees' perception of training …

Raman Spectroscopic Study Of Single Red Blood Cells Infected By The Malaria Parasite Plasmodium Falciparum, William Carter

Electronic Theses and Dissertations

Raman micro-spectroscopy provides a non-destructive probe with potential applications as a diagnostic tool for cellular disorders. This study presents micro-Raman spectra of live erythrocytes infected with a malaria parasite and investigates the potential of this probe to monitor molecular changes which occur during differentiation of the parasite inside the cell. At an excitation wavelength of 633 nm the spectral bands are dominated by hemoglobin vibrations yielding information the on structure and spin state of the heme moiety. It also demonstrates the novel use of silica capillaries as a viable method for studying the erythrocytes in an environment that is much …

Two-Photon 3d Optical Data Storage Via Fluorescence Modulation Of Fluorene Dyes By Photochromic Diarylethenes, Claudia Corredor

Electronic Theses and Dissertations

Three-dimensional (3D) optical data storage based on two-photon processes provides highly confined excitation in a recording medium and a mechanism for writing and reading data with less cross talk between multiple memory layers, due to the quadratic dependence of two photon absorption (2PA) on the incident light intensity. The capacity for highly confined excitation and intrinsic 3D resolution affords immense information storage capacity (up to 1012 bits/cm3). Recently, the use of photochromic materials for 3D memory has received intense interest because of several major advantages over current optical systems, including their erasable/rewritable capability, high resolution, and high sensitivity. This work …

An Investigation Of The Relationship Between Counseling Self-Efficacy And Counselor Wellness Among Counselor Education Students, Jennifer Curry

Electronic Theses and Dissertations

Recent research in counselor training has focused on the difficulties and challenges facing counseling practitioners that result in high stress, burnout, compassion fatigue, vicarious trauma, and counselor impairment. The American Counseling Association's (ACA) Code of Ethics has addressed the ethical issues inherent in counselor impairment. Further, the Council for Accreditation of Counseling and Related Educational Programs (CACREP) has focused on the development of counselors that will assist them in being resilient to workplace stressors. Wellness is a theoretically based construct that holds much promise for bolstering the resilience of pre-service counselors. In addition, counselor self-efficacy has been linked to greater …

Genetic And Phenotypic Evolution In The Ornate Chorus Frog (Pseudacris Ornata): Testing The Relative Roles Of Natural Selection,, Jacob Degner

Electronic Theses and Dissertations

Understanding how migration, genetic drift, and natural selection interact to maintain the genetic and phenotypic variation we observe in natural populations is a central goal of population genetics. Amphibians provide excellent model organisms for investigating the interplay between these evolutionary forces because amphibians are generally characterized by limited dispersal abilities, high philopatry, and are obligately associated with the areas around suitable habitats (e.g. breeding ponds). Thus, on relatively small geographic scales, the relative effects of all of these evolutionary forces can be studied together. Here, we study the interaction of migration, genetic drift, natural selection, and historical process in the …

Spectroscopic Studies Of Laser Plasmas For Euv Sources, Simi A. George

Electronic Theses and Dissertations

With the availability of high reflectivity multilayer mirrors and zone plate lenses, the EUV region (5nm - 40nm) of the electromagnetic spectrum is currently being explored for applications of nanoscale printing and imaging. Advances made in this area have consequences for many areas of science. Research for producing a compact, bright EUV source for laboratory use has gained momentum in recent years. For this study, EUV radiation is produced by irradiating target materials using a focused laser beam. Focused laser beam ionizes the target to create a hot, dense, pulsed plasma source, where emission is a result of the relaxation …

Life History And Reproductive Biology Of Clitoria Fragrans Relative To Fire History On The Avon Park Air Force Range, Michelle Nicole Lewis

Electronic Theses and Dissertations

The southeastern coastal plain of the United States is a center of endemism for plants in temperate North America and second only to California among the states. In the southeast, Florida has the largest number of these endemic plants. The largest number of these Florida endemics can be found in the fire maintained scrub and sandhill communities located on sandy ridges in Central Florida. One such endemic is Clitoria fragrans, a rare perennial herb. C. fragrans reproduces via a mixed mating system. It produces both open, chasmogamous flowers and closed, selfed, cleistogamous flowers. Little else is known about its biology. …

Physically-Based Visualization Of Residential Building Damage Process In Hurricane, Dezhi Liao

Electronic Theses and Dissertations

This research provides realistic techniques to visualize the process of damage to residential building caused by hurricane force winds. Three methods are implemented to make the visualization useful for educating the public about mitigation measures for their homes. First, the underline physics uses Quick Collision Response Calculation. This is an iterative method, which can tune the accuracy and the performance to calculate collision response between building components. Secondly, the damage process is designed as a Time-scalable Process. By attaching a damage time tag for each building component, the visualization process is treated as a geometry animation allowing users to navigate …

Demographic Consequences Of Managing For Florida Scrub-Jays (Aphelocoma Coerulescens) On An Isolated Preserve., Casey Lyon

Electronic Theses and Dissertations

Many species naturally occupy discrete habitat patches within a mosaic of habitats that vary in quality. The Florida scrub-jay (Aphelocoma coerulescens) is endemic to Florida scrub, a habitat that is naturally patchy and greatly reduced in area over recent decades owing to development and urbanization. Because of this habitat loss, future management of Florida scrub-jays will focus on smaller, fragmented tracts of land. My study examines such a tract, Lyonia Preserve, southwest Volusia County, FL. This preserve was unoccupied by scrub-jays prior to habitat restoration. The preserve is now frequently managed exclusively for scrub-jays as a habitat island surrounded by …

Postmodern Feminism, Hypertext, And The Rhetoric Of Cooking Websites, Heather Eaton Mcgrane

Electronic Theses and Dissertations

This study explores the ways cookbooks and their rhetorical dimensions have been re-imagined using hypertext and Web technology. Using the tenets of postmodern feminist rhetoric and Web design theory, the study considers how commercial cooking hypertexts construct users' identities. Although hypertext is a potentially empowering technology, democratizing rhetoric and knowledge making practices, commercial hypertext often circumscribes agency formation and prohibits participation. Participatory, constructive hypertexts are difficult to design and costly to maintain. Of the three sites studied, Epicurious.com, BettyCrocker.com, and FoodNetwork.com, only Epicurious.com encourages meaningful communication between users and between users and designers. In many ways, Epicurious.com conceives of its …

Applying The Appraisal Theory Of Emotionto Human-Agent Interaction, Aaron Pepe

Electronic Theses and Dissertations

Autonomous robots are increasingly being used in everyday life; cleaning our floors, entertaining us and supplementing soldiers in the battlefield. As emotion is a key ingredient in how we interact with others, it is important that our emotional interaction with these new entities be understood. This dissertation proposes using the appraisal theory of emotion (Roseman, Scherer, Schorr, & Johnstone, 2001) to investigate how we understand and evaluate situations involving this new breed of robot. This research involves two studies; in the first study an experimental method was used in which participants interacted with a live dog, a robotic dog or …

High Birefringence Liquid Crystals For Optical Communications, Amanda Jane Parish

Electronic Theses and Dissertations

High birefringence (Δn > 0.4) nematic liquid crystals are particularly attractive for infrared applications because they enable a thinner cell gap to be used for achieving fast response time and improved diffraction efficiency. In this thesis, the mesomorphic and electro‐optic properties of several new fluorinated isothiocyanate (NCS) terphenyl and phenyl tolane single compounds and mixtures are reported. The single compounds demonstrated Δn~0.35‐0.52 in the visible spectral region at room temperature and exhibit relatively low viscosity. It was found that lateral fluorine substitutions and short alkyl chains eliminate smectic phase and lower the melting temperature of the single compounds. However, the consequence …

An Investigation Of The Relationship Between Graduate Counseling Students' Perceptions Of Spirituality And Counselor Self-Ef, Sandra Pollock

Electronic Theses and Dissertations

Counseling and psychology have experienced a conflicted relationship with the issue of spirituality over the last century. Spirituality is a construct that has been receiving more attention in counseling over the last fifteen to twenty years. More counselors and educators are affirming its place and value in the counseling relationship. Yet, there is a disparity between this and what counselors-in-training are being taught regarding spirituality, its value to clients and counselors, and its role in the counseling relationship. Very little research has been done examining spirituality and its relationship to counseling students level of confidence and competence in their work--their …

Locus Of Control And Self-Efficacy: Potential Mediators Of Stress, Illness, And Utilization Of Health Services In College Studen, Angela Roddenberry

Electronic Theses and Dissertations

Stress has been linked to increased illness in several biologically based studies. In contrast, only a limited number of studies have assessed psychological variables related to stress, with self-efficacy and locus of control serving as potentially important variables. Thus, the current study investigated the mediating effects of self-efficacy and locus of control in the relationship between stress, psychological and physical symptoms, and the utilization of health services in college students. Results suggested that stress was correlated positively with symptoms. External locus of control was correlated positively with stress and symptoms, and self-efficacy was correlated negatively with stress and symptoms. Further, …

Analytical Potential Of Polymerized Liposomes Bound To Lanthanide Ions For Qualitative And Quantitative Analysis Of Proteins, Marina Santos

Electronic Theses and Dissertations

One of the intriguing features of biological systems is the prevalence of highly selective and often very strong interactions among different cellular components. Such interactions play a variety of organizational, mechanical, and physiological roles at the cellular and organism levels. Antigen-antibody complexes are representative examples of highly selective and potent interactions involving proteins. The marked specificity of protein-antibody complexes have led to a wide range of applications in cellular and molecular biology related research. They have become an integral research tool in the present genomic and proteomic era. Unfortunately, the production of selective tools based on antigen-antibody interactions requires cumbersome …

Evaluating Neonatal Facial Pain Expression: Is There A Primal Face Of Pain?, Martin Schiavenato

Electronic Theses and Dissertations

Pain assessment continues to be poorly managed in the clinical arena. A review of the communication process in pain assessment is carried out and the hierarchical approach often recommended in the literature -with self-report as its "gold-standard," is criticized as limited and simplistic. A comprehensive approach to pain assessment is recommended and a model that conceptualizes pain assessment as a complex transaction with various patient and clinician dependant factors is proposed. Attention is then focused on the pediatric patient whose pain assessment is often dependent on nonverbal communicative action. The clinical approaches to pain assessment in this population -mainly the …

Characterization Of Pigment Cell Specific Genes In The Sea Urchin Embryo (Strongylocentrotus Purpuratus), Tricia Stephens

Electronic Theses and Dissertations

In sea urchin development, cell fate specification appears by the 60-cell stage embryo when several embryonic territories are recognized: the small micromeres, the large micromeres which will generate primary mesenchyme cells, the vegetal2 layer that will give rise to pigment cells, immunocytes, and muscle cells, the vegetal1 layer, as well as the oral and aboral ectoderm. A Delta-Notch signaling event is required for the differential specification of mesodermal cells that will give rise to secondary mesenchyme cells (SMCs). SMCs produce four cell types: pigment cells, blastocoelar cells, circumesophageal muscle cells, and coelomic pouch cells. Pigment cells are the first to …

Responses Of Small Rodents To Restoration And Management Techniques Of Florida Scrub At Cape Canaveral Air Force Station, Florid, Alexis Suazo

Electronic Theses and Dissertations

Proper habitat management is essential for the survival and reproduction of species, especially those listed under state or federal laws as endangered, threatened or of special concern, and those with small local populations. Land managers use a combination of mechanical cutting and prescribed burning to manage and restore degraded scrub habitat in east central Florida. This approach improves habitat for the endangered Florida scrub-jay (Aphelocoma coerulescens), but little is known about its effects on other taxa, especially the threatened southeastern beach mouse (Peromyscus polionotus niveiventris). This single species approach may not be beneficial to other taxa, and mechanical cutting and …

Airport Security: Examining The Current State Of Acceptance Of Biometrics And The Propensity Of Adopting Biometric Technology Fo, Kristine Sumner

Electronic Theses and Dissertations

The terrorist attacks of September 11, 2001 propelled the issue of aviation security to the forefront of the U.S. domestic agenda. Although hundreds of individual airports exist in the U.S., the travel activities at each of these airports combine to holistically comprise an aviation system that represents a significant portion of the U.S. social and economic infrastructure. Disruption at one airport resulting from a criminal act, such as terrorism, could exert detrimental effects upon the aviation system and U.S national security (9/11 Commission, 2004). Each U.S. airport is individually responsible for various aspects of security including the control of physical …

Discrete Surface Solitons, Sergiy Suntsov

Electronic Theses and Dissertations

Surface waves exist along the interfaces between two different media and are known to display properties that have no analogue in continuous systems. In years past, they have been the subject of many studies in a diverse collection of scientific disciplines. In optics, one of the mechanisms through which optical surface waves can exist is material nonlinearity. Until recently, most of the activity in this area was focused on interfaces between continuous media but no successful experiments have been reported. However, the growing interest that nonlinear discrete optics has attracted in the last two decades has raised the question of …

The Effects Of A Structured Lifestyle Intervention Program In Conjunction With Dietary Supplementation On Weight Loss And Risk F, Linda Zukley

Electronic Theses and Dissertations

The objective of this study was to determine the effects of a structured weight loss program that included hypocaloric diet, exercise and dietary supplementation, on weight loss, metabolic syndrome risk factors and antioxidant levels in healthy overweight and obese females. Thirty-seven healthy overweight and obese women (BMI 29.5 ± 2.3 kg/m2, 41.1 ± 7.1 yrs) participated in this study. The subjects were randomized into one of two groups: an exercise, hypocaloric diet and antioxidant supplement (LifePak®; LSANT group, n=20) or an exercise, hypocaloric diet and appetite suppression supplement (HTP Complex® and TēGreen®; LSAS group, n=17). A significant weight loss occurred …