Digital Commons Network^™

Biocentrism In Environmental Ethics: Questions Of Inherent Worth, Etiology, And Teleofunctional Interests, David Lewis Rice Iii

Graduate Theses and Dissertations

Some biocentrists argue that all living things have "inherent worth". Anything that has inherent worth has interests that provide a reason for why all moral agents should care about it in and of itself. There are, however, some difficulties for biocentric individualist arguments which claim that all living things have inherent worth.

Some biocentrists maintain that all living things have inherent worth and that artificial living things do not because the former, but not the latter, have interests by recourse to their natural selection etiology. Some also argue that synthetic forms of life do not have moral standing because they …

Assessment Of The Level Of Protection Against Coccidiosis In Broiler Breeders Conferred By A Live Anticoccidial Vaccine, And Its Influence On Early Growth And Development., Muhammed Shameer Abdul Rasheed

Graduate Theses and Dissertations

Coccidiosis continues to be a great challenge to the poultry industry all over the world and in broiler breeders vaccination with live oocysts of Eimeria has been widely adopted as a control measure. Broiler breeders are usually subjected to feed restriction during their early growth however no studies have been undertaken on the effects of vaccination in birds whose feed has been restricted in this manner. The objective of this study was to assess the level of protection acquired by broiler breeder chickens when immunized at day-old with live eimerian oocysts and given a restricted diet. Effects upon growth and …

Identification Of Biomarkers Associated With Rous Sarcoma Virus-Induced Tumors In Two Divergently Selected Chicken Lines, Ashley Hayden

Graduate Theses and Dissertations

Poultry has become especially important to genetic research due to breeding feasibility, short generation turnover, and ease of maintaining large populations. The discovery of virus induced cancer has paved the way for further genetic studies. Rous Sarcoma Virus (RSV) is a tumor-causing virus that infects poultry. While not prevalent today, it can serve as a model for virus-induced cancer in humans and create additional insight to marker assisted selection in poultry. Genetically selected Arkansas Progressor (AP) and Arkansas Regressor (AR) chicken lines have been established and maintained at the Arkansas Experimental Station (AES) in Fayetteville, AR. Previous research has investigated …

In Vitro Fermentation Patterns Of Rice Bran Components By Human Gut Microbiota, Tung Minh Pham

Graduate Theses and Dissertations

The prevalence of colorectal cancer (CRC) has been increasing in recent years worldwide. In the United States, it is ranked the second leading cause of cancer death. Risks of CRC increase with age and are associated with several lifestyle factors such as diet, drinking and smoking habits, and levels of physical activity. There is an abundance of scientific literature demonstrating the protective roles of several dietary components including fibers and polyphenolic compounds. These compounds have been shown to be able to positively modulate gastrointestinal ecology by increasing the production of short-chain fatty acids (SCFA) and promoting the population of beneficial …

Comparisons Of Selected Household And Commercial Disinfectants Against Poultry Salmonella Isolates And A Survey Of Internal Parasites In Backyard Poultry In Arkansas, Kayleigh Moyle

Graduate Theses and Dissertations

Backyard and exhibition poultry have been gaining in popularity and as such there has been a large increase in the number of small flocks. As the interaction with poultry has increased, so has the opportunity for diseases and parasites, for both birds and people. One of the major zoonotic illnesses is caused by the bacteria Salmonella, which can be found in commercial and small flocks. Salmonella is the number 2 contributor of foodborne illnesses so its prevalence in commercial flocks is of high concern. Despite improved cleaning, disinfection, and biosecurity practices, there is still potential for disease outbreaks and infections …

Investigation Of The Interaction Of Dimeric Ruthenium Complexes With Cytochrome B5, Christopher Dain Rupar

Graduate Theses and Dissertations

Photoreactive complexes to study the kinetics of electron transfer of proteins have been in use for a long time. It has always been speculated that complexes bind near the heme or the electron transfer reaction would not occur. But it is unkown exactly how the complex interacts with the protein. The structural, thermodynamic, and kinetic properties of rat liver microsomal cytochrome b5 were investigated when bound to ruthenium dimer complexes. Heteronuclear Single Quantum Coherence studies support a dynamic binding model of a dimer Ru complex bound near the protein’s heme involving residues H39, E44, G42, V61, G62, and H63. The …

The Cytotoxic And Antimicrobial Properties Of Pine Essential Oils: A Characterization And Comparison, Richard Sakul

Graduate Theses and Dissertations

In the forestry industry, the pine tree species are important because of their durable timber and fast growth. In Arkansas, trees such as the loblolly pine compose almost a third of the timberland, seven million acres. In addition to the lignocellulosic biomass, pine bark and needles potentially have industrial importance as a waste stream from which high value (e.g., pharmaceutical, cosmetics) chemicals could be extracted, which could potentially increase the profit margin of forestry operations. In this research, the possibility that pine needles harvested from industry processed pine tree residues could be used as an antibacterial or cytotoxic chemical agent …

Applications Of The Gst- Affinity Tag In The Purification And Characterization Of Proteins, Wibke Beatrice Kachel

Graduate Theses and Dissertations

With the latest innovations in biological sciences, large quantities of biologically active polypeptides as well as high throughput screening methods to quickly evaluate if these biomolecules potentially have therapeutic, diagnostic, or industrial purposes are required. The synthesis and purification of peptides and small proteins continue to be demanding as the production of high yields through chemical synthesis can involve large costs. On the other hand, there are only few examples of acquiring those biomolecules through cloning and expression in bacterial systems in form of recombinant fusion proteins. Glutathione S-Transferase (GST) is not only a very commonly used affinity tag to …

Experiences Of Agricultural Education Preservice Teachers Engaging In Critical Friendships, Sable Sellick

Graduate Theses and Dissertations

Like educators in other disciplines, agricultural education preservice teachers must find ways to improve as teachers using methods such as reflection or peer observation. Critical friendship combines both, promoting reflection through the use of a critical friend who observes an individual’s teaching and provides constructive criticism to help the individual advance their practice. This qualitative study sought to use the critical friendship concept to assist agricultural education preservice teachers in reflecting on their teaching techniques. Participants were randomly assigned to one of two groups; one group selected a critical friend in agricultural education, and the other group selected a critical …

Elucidating The Genetic Cause To Ascites Syndrome In Broiler Chickens Utilizing Multi-Generational Genome Wide Association Studies, Katy Tarrant

Graduate Theses and Dissertations

Ascites syndrome in broiler chickens has developed into a source of economic loss in the last three decades. Intensive selective pressure, and implementation of flock management practices, has successfully reduced ascites frequency, but has not eliminated its occurrence. For this reason, it is imperative to better understand the genetic cause to ascites in broiler chickens. Previous studies of this magnitude have been attempted, but, thus far, a consensus of genomic associations have not been made. This collection of studies was aimed at identifying and interpreting genomic and genetic associations to ascites phenotype specific to a broiler line representative of a …

Long-Term Supplementation With Leucine Does Not Prevent Development Of Obesity In Rats Fed A High-Fat Diet, Dameon Smith

Graduate Theses and Dissertations

Excess dietary fat consumption has been implicated in the development of obesity and diabetes. Obesity can be characterized by a disproportionate increase in fat mass compared to lean body mass. However, if muscle mass can be increased or maintained in obesity, this may facilitate weight loss by increasing the body’s overall metabolic capacity. Historically, supplementation with the branched-chain amino acid leucine has been shown to increase muscle protein synthesis via the protein kinase mTORC1. Recent studies suggest that supplementation with leucine also has the potential to reduce weight gain and fat deposition in high-fat fed, obese mice. The objective of …

Genetic Basis Of Biosynthesis And Cytotoxic Activity Of Medicago Truncatula Triterpene Saponins, Brynn Kathleen Lawrence

Graduate Theses and Dissertations

Saponins are a large family of specialized metabolites produced in many plants. They can have negative effects on a number of plant pests and are thought to play a role in plant defense. With current and possible future uses in industry and agriculture, saponins have also been shown to be hypocholesterolemic, hypoglycemic, immunostimulatory, antioxidative, anti-inflammatory, and cytotoxic. In spite of their usefulness, our understanding of the genetic basis for saponin biosynthesis is still incomplete. We generated recombinant populations with parents from genetically distinct accessions of Medicago truncatula, with either high or low accumulation and varying profiles of saponins. Primers for …

Preferred Leadership Communication Styles Across Cultures, Joy J. Cherfan

Graduate Theses and Dissertations

This thesis reports the results of a two-part study investigating preferred leadership communication styles across multiple cultural clusters. Utilizing a survey, part one identified the three most preferred leader communication styles (i.e., dominant, dramatic, contentious, attentive, animated, open, friendly, relaxed, impression leaving) in six cultural clusters. Using focus group data, the second part provides insight into subordinates’ perceptions of how these communication styles are enacted by leaders in each cluster. Guidelines on how to better communicate are offered to expatriates in hopes of helping them more successfully complete overseas tasks. Such guidelines are needed due to the high percentage of …

Social Learning Remixed: Peer-Based Learning And Social Status In An Online Community Of Practice, Christopher Erin Mikkelson

Graduate Theses and Dissertations

People have engaged in peer-to-peer learning within communities of practice (CoPs) for centuries. Thanks to web 2.0 technology, people in the 21st century can now learn together and enact Social status even if they have never met face-to-face. Online communities of practice have since formed around a wide variety of activities, one of which is remixing. Remixing is defined as combining or editing existing materials to produce something new, but leaving each part recognizable as a separate entity. Remixing has recently been recognized as form of digital literacy because users must understand each component to make a good remix. Much …

Evaluation Of Agricultural Policy In The Dairy Sector In Kosovo And Efficiency Analysis At The Farm Level, Egzon Bajrami

Graduate Theses and Dissertations

This thesis consists of two studies on the dairy sector in Kosovo. The first study evaluates the effect of the Subsidy per Head Scheme (SPHS) on increasing production, land use, gross income and number of dairy cows on dairy farms in Kosovo. Results from the Propensity Score Matching (PSM) approach using four alternative matching algorithms revealed that SPHS has not had any impact on increasing land use, gross income or the number of dairy cows per farm. Furthermore, SPHS had a negative impact on decreasing land use and number of cows for the participating dairy farmers in the program. In …

Negotiating The Politics Of Representation In Iranian Women’S Cinema Before And After The Islamic Revolution, Alshaatha Sultan Al Sharji

Graduate Theses and Dissertations

From Mahvash, the Iranian entertainer who sang and danced coquettishly in numerous Iranian films that were produced before the Islamic revolution of 1979, to the skateboarding vampire girl who makes a feast out of abusive men in Ana Lily Amirpour’s A Girl Walks Home Alone at Night, the representation of Iranian women on screen has changed drastically. This comparative study focuses on the politics of representation of Iranian women in the cinema before and after the Islamic revolution, with the aim of deconstructing the readily-available notions of women’s oppression in Iran. It analyzes the works of female Iranian directors Forough …

An Investigation Of Short-Term Plasticity In Human Motor Cortex, Matthew Alan Gannon

Graduate Theses and Dissertations

Transcranial magnetic stimulation (TMS) produces a transient magnetic field that activates underlying cortical tissue by eliciting an electrical discharge of the neurons in the targeted area. Repetitive TMS (rTMS) uses patterns of repetitive TMS pulses and has been reliably shown to produce changes in the state of cortical excitability outlasting the time of stimulation. One such protocol that has demonstrated states of increased excitability is intermittent theta burst stimulation (iTBS). This method applies high-frequency bursts (50Hz) of pulses every 200 ms in trains of ten bursts. The effects of and differences between rTMS protocols have been investigated since gaining popularity …

Characterization Of Broiler Lines Divergently Selected For Breast Muscle Color, Sara Katherine Orlowski

Graduate Theses and Dissertations

An increase in the consumption of poultry has generated an increase in demand for higher yielding broilers. This has led to an increase in atypical meat and issues with appearance. Color is a direct result of a pH decline as meat goes through rigor mortis with meat generally becoming lighter. If the pH declines too rapidly or too slowly, meat quality can suffer. Physical properties of meat can be altered by pH. A fast pH decline results in pale meat with decreased tenderness. A slow pH decline can result in darker meat with a reduced shelf-life. With a known relationship …

Revision And Re-Writing As Adaptation: Using Adaptation Theory To Encourage Student Recognition Of Rhetorical Situations, Alicia Claire Troby

Graduate Theses and Dissertations

Many students don’t want to revise their writing, or do so in small, surface-level ways. This has been an issue many composition instructors have faced over the years, and there is a large body of scholarship about revision and the writing process by many in writing studies. From Nancy Sommers, Janet Emig, Donald Murray, and others, to more recent publications “post-process,” composition instructors and writing studies scholars are concerned about revision and the role it plays in students’ learning to write. As a strategy for teaching bigger-level revision, I implemented the use of adaptation theory (reading/watching and doing adaptation) as …

Evaluation Of Long-Acting Eprinomectin Compared To Conventional Anthelmintics In Cow/Calf Production, Elizabeth Ann Backes

Graduate Theses and Dissertations

Experiment 1, 83, newly weaned, fall-born crossbred heifer calves were allocated randomly to 1 of 3 anthelmintic treatments: 1) control (CON); 2) combination pour-on moxidectin and oxfendazole (MO); and 3) long-acting eprinomectin (LAE). Two preplanned orthogonal contrast statements were used: 1) to compare CON to treated cattle; and 2) to compare OXF to LAE. Heifer BW and BCS were greater (P≤0.02) from MO and LAE on d 112, 140, 154, 168, 182 compared to CON. Heifer cyclicity, estrous detection, natural service and overall pregnancy rates were greater (P≤0.02) for MO and LAE compared to CON. Cattle fecal egg counts (FEC) …

Do Limestone Quarries Act As “Engineered Sinkholes”? Analysis Of Exfiltration Of Groundwater From Limestone Quarries In The Boone Formation, Ozark Physiographic Province, Arkansas, Usa, Noel Turner

Graduate Theses and Dissertations

Limestone quarries are a source of construction materials that are utilized in our everyday lives. Karst landscapes cover up to 15 percent of the Earth’s surface, and limestone quarries are found in these environmentally sensitive regions where groundwater and surface-water interactions are dynamic and complex. Several studies have provided conceptual models of groundwater flow to and out of quarries. The goal of this research was to describe the geochemistry of water exfiltration from limestone quarries in karst regions via joints, fractures, faulting, or karst features and to determine if limestone quarries are “engineered sinkholes”; that is to say: did quarries, …

The Juvenile Addiction Risk Rating For Use In Vocational Rehabilitation, Paul Tyler Hickerson

Graduate Theses and Dissertations

The prevalence of substance use among adolescents warrants considerable concern since it often has detrimental effects on an individual’s physical and mental health, and correlates with worsened Social, physical, and employment outcomes. Research shows that adolescents with disabilities are especially susceptible to the development of substance use disorders. To address this concern and to ensure accurate rehabilitation service planning, effective screening for substance use risk is necessary. Unfortunately, the most common screening instruments for adolescent substance use rely on information obtained solely from self-report. This type of data, although useful, is also susceptible to inaccuracies due to such factors as …

The Life And Work Of George Dombek, Jeffrey Scott Ramsey

Graduate Theses and Dissertations

George Dombek is an accomplished artist who graduated from the University of Arkansas with degrees in Architecture and Painting. His career as both professor and painter has taken him around the world and produced a substantial body of work. This work seeks to examine his art in a larger art historical context and consider the development of the subjects and style of his paintings over the span of his career.

Studies In The Asymmetric Synthesis Of The C21-C34 Fragment Of The Natural Product, Antascomicin B, Brian Lee Walker

Graduate Theses and Dissertations

This dissertation describes studies in the asymmetric synthesis of the C21 – C34 fragment of the natural product, antascomicin B. Antascomicin B is structurally related to FK506, binds strongly to FKBP12, yet does not shown immunosuppressive activity. Small ligand FKBP12 binding complexes were shown to have potent neuroprotective and neuroregenerative properties in mouse models of Parkinson’s disease. The highlighted chemical reactions include an asymmetric transfer hydrogenation (ATH), Ireland-Claisen rearrangement (ICR), directed hydrogenation and allylic diazene rearrangement.

Children’S Peer Relationship Quality And Changes In Peer Victimization: The Search For Viable Intervention Targets, James Thomas Craig

Graduate Theses and Dissertations

Stable peer victimization during childhood and adolescence has been linked to both concurrent and future Social and psychological maladjustment (e.g., Hawker & Boulton, 2000; Juvonen, Graham, & Schuster, 2003; Kaltiala-Heino, Rimpela, Rantanen, & Rimpela, 2000; Reijntjes, Kamphuis, Prinzie, & Telch, 2010). Currently, there is evidence to suggest the quality of children’s peer relationships is associated with the level and course of their victimization experiences (e.g., Fox & Boulton, 2006; Schwartz, McFayden-Ketchum, Dodge, Petit, & Bates, 1999; Wolke, Woods, & Samara, 2009). Although the link between peer relationship quality and victimization has been well-documented in the literature; lacking is a thorough …

Associations Of Single Nucleotide Polymorphisms In The Bovine Prolactin, Melatonin Receptor 1a, And Dopamine Receptor D2 Genes With Hair Coat Shedding Scores And Productivity Traits In Beef Cattle, Laura R. Meyer

Graduate Theses and Dissertations

Calving rate is a qualitative trait regulated by several genes and is strongly affected by the environment. With the development of biotechnology and gene identification, scientists are able to determine which genes affect these productivity traits to improve accurate selection decisions. Prolactin (PRL) has been associated with reproductive traits, melatonin receptor 1a (MTNR1A) has been associated with meat quality traits, and the dopamine receptor D2 (DRD2) gene has been associated with hair coat score (HCS) in cattle. Our objective was to determine associations between mutations in the PRL, MTNR1A, and DRD2 genes and cow-calf profitability traits. Genomic DNA was extracted …

The Effect Of Face-To-Face Versus Computer-Mediated Communication On Interpersonal Outcomes In Getting-Acquainted Situations, Nicole Rae Brandon

Graduate Theses and Dissertations

People use technology more today than ever before to self-disclose and form new relationships with others. Successful relationship development is often marked by the presence of positive interpersonal outcomes (i.e., closeness and liking). However, there is contention regarding whether computer-mediated communication (CMC) is as effective at developing positive interpersonal outcomes compared to face-to-face (FtF) communication. CMC is often considered subpar due to the lack of nonverbal cues that can be expressed. Two studies were designed to 1) compare the effect of FtF and CMC platform self-disclosures on closeness and liking in zero-acquaintance situations and 2) explore mediators that might explain …

"Everyone Has Thought About Killing Someone - One Way Or Another": Cannibalism And The Question Of Morality In Bryan Fuller's Hannibal, Kristi Michelle Pierse

Graduate Theses and Dissertations

Popular criticism insists that violence in the media perpetuates violence in the real world. This is an especially relevant argument today as we witness on a daily basis the violence that is occurring in the United States through mass shootings, police brutality, and countless other forms of aggressive actions. While studies do show a correlation between violent media and real-world violence, there is no absolute conclusion that proves such. My thesis addresses the moral lessons that can be learned through violence on television, particularly through the creative adaptation of Thomas Harris’ Hannibal Lecter series as reimagined by Bryan Fuller in …

Cross Validation Of The Caregiving Helplessness Questionnaire: Associations With Maternal History Of Maltreatment And Intimate Partner Violence, Maegan Calvert

Graduate Theses and Dissertations

Disorganized caregiving has been associated with both maternal childhood history and current experiences of trauma. However, the methods by which disorganized caregiving has been studied have been time intensive and costly. The current study aimed to extend previous research with the Caregiving Helplessness Questionnaire (CHQ; George & Solomon, 2011), which is a self-report measure designed to assess aspects of disorganized caregiving such as caregiving helplessness, role reversal, and frightened/frightening caregiving experiences. Participants (N = 156) were a community sample of mothers of children ages 5 to 10 who were primarily white and who reported a range of traumatic experiences. It …

High Throughput Phenotypic Evaluation Of Drought-Related Traits In Soybean, Hua Bai

Graduate Theses and Dissertations

Drought limits crop growth and yield in soybean. Rapid and effective methods of screening large numbers of soybean lines for drought tolerance are urgently needed. Two experiments were conducted to evaluate the effects of drought in soybean during reproductive stages. In the first experiment five genotypes from maturity groups 2 through 5 were tested under well-irrigated and drought conditions. Beginning at R5, leaf samples were taken for nitrogen concentration analysis. Pictures were taken across the top of each plot to determine the intensity of greenness using the Dark Green Color Index (DGCI). Aerial photographs were also taken to determine aerial …