Digital Commons Network^™

Initial Fine Mapping Of The Spinach Downy Mildew Resistance Locus Rpf1, Wei Yang

Graduate Theses and Dissertations

Spinach is an important vegetable crop grown in many parts of the world (Correll et al. 2011). It has become increasingly popular due to its nutritional value as it is very high in antioxidants (Prior, 2003). Spinach production, however, is affected by many biotic stresses. Downy mildew, caused by Peronospora farinosa f. sp. spinaciae (Pfs) , is perhaps the most important biotic constraint for spinach production worldwide (Correll et al, 1994). As of 2012, 14 races of Pfs have been reported (Correll et al., 2011). The rapid increase of new races is likely a direct result of substantial changes in …

Hair Shedding Scores Relating To Maternal Traits And Productivity In Beef Cattle, Ashton Williams

Animal Science Undergraduate Honors Theses

The objectives of this study were to measure how quickly cattle shed their winter coat in the sub-tropical climate of Arkansas. As well as, to understand the role age may play on cattle shedding efficiency in spring and summer months, in conjunction with the relationship between mother hair coat and calf sex. Angus based commercial beef cattle (n = 224) were observed over a five-month period in 2012. Once monthly, at approximately 28-day intervals, cattle were evaluated for shedding on a scale from 1 to 5. A score of 5 indicated the cow/heifer had a full winter coat and a …

The Green Tray - Nutritional Auditing Service, Nicholas Henry

Finance Undergraduate Honors Theses

The Green Tray is a nutritional auditing service that will reduce nutrition-related health problems and their associated costs by connecting educational, business, and health institutions to small, healthy food service providers. The Green Tray is seeking a $250,000 capital investment to enter the $137.8 billion non-commercial food services market. By the end of year 3 of our operations, The Green Tray projects to achieve $3.36 million in net revenue and will be recognized as a leader in institutional nutrition auditing services.

Foodways, Families, And Festivities: Ethnobiology And Cultural Conservation In A Rural Missouri Community, Ian Carter Smith

Graduate Theses and Dissertations

Food customs and traditions bind human groups together in many ways--Socially, geographically, temporally, and emotionally. This thesis describes the intricate relationships between food, ritual, and cultural identity in a rural German-Catholic community in Missouri. By drawing on the anthropological, cultural geographical and folkloric literature surrounding rural Missouri, a portrait of foodways emerges, which in turn illuminates valuable, often understated regional cultural traditions. Religion and ritual are understood as crucial to the continuity of regional identity--it is reinforced and made resilient through shared Social action. The dispersal of ritual feasts and fasts throughout the calendar year regulates collective behavior, interactions, conversations, …

Ccaat-Binding Factor As A Transcriptional Regulator Of Cyc1 In Candida Albicans, Carmen S. Padilla-Marcia

Graduate Theses and Dissertations

Candida albicans is a normal commensal of the human flora; however, under appropriate circumstances this organism can become pathogenic to the host and cause life threatening conditions. In fact, Candida species are the fourth most common nosocomial infection in the Unites States with a mortality rate of over 30%

The CCAAT binding factor is a multi-protein transcription factor highly conserved in eukaryotes. It binds specifically to the consensus sequence 5'-CCAAT-3' in promoters and it is one of the most common cisacting elements in eukaryotes promoters. This transcription factor is composed of three DNA binding subunits; Hap2p, Hap3p and Hap5. In …

Tailored Breastfeeding Intervention For Hispanic Mothers, Helen Mashie

The Eleanor Mann School of Nursing Undergraduate Honors Theses

A retrospective chart review was done using a sample of breastfeeding Hispanic mothers recruited from a large pediatric clinic in Northwest Arkansas in order to examine the impact of a tailored breastfeeding intervention and to identify factors associated with discontinuation of breastfeeding before four months of age. It was hypothesized that Hispanic women who participated in the study would increase their breastfeeding rates compared to Hispanic women who received no intervention. Breastfeeding rates at four months were assessed via self-report in the electronic medical record. Variables within the sample population that were measured include maternal age, maternal education, primary language …

Oxidation Of Thrombomodulin Methionine 388 In Cigarette Smokers, Samrat B. Thapa

Graduate Theses and Dissertations

This work tested the hypothesis that oxidation of methionine 388 in thrombomodulin is higher in cigarette smokers, and thus a likely contributor towards the hypercoagulable state in smokers. Thrombomodulin, a protein cofactor found on endothelial cell surfaces, regulates the activity of thrombin. Thrombin bound to thrombomodulin no longer converts fibrinogen to fibrin, but instead activates Protein C which, in turn, stops the coagulation cascade by inactivation of clotting factors. The oxidation of methionine 388 of thrombomodulin has been shown in vitro to dramatically decrease the anticoagulant cofactor activity of thrombomodulin. The blood of cigarette smokers is more prone to clot …

Effects Of Ergot Alkaloids And Bovine Bodily Fluids On Cytochrome P450 Activity, Nicholas Scott Ezell

Graduate Theses and Dissertations

This thesis evaluates the Promega^TM P450-Glo assay (Promega^TM V9800) as a tool for quantifying ergot alkaloid concentration. Current techniques used for detection of ergot alkaloids are slow and expensive, do not detect all ergot alkaloids, or are not effective on bovine bodily fluids. The first study was conducted to determine effects of commercial ergot alkaloids (n = 6; 0 - 400 μM) on the Promega^TM P450-Glo assay. Cytochrome P450 (CYP450) activity in assay had a differential response to each ergot alkaloid and concentration. As concentrations of ergotamine, dihydroergotamine, ergocornine, and ergocryptine increased CYP450 activity was inhibited (P …

Efficacy Of Probiotics For Reducing The Incidence Of Lameness In Broilers Grown On Wire Flooring, John Matthew Stark

Graduate Theses and Dissertations

Growing broilers on wire flooring provides an excellent experimental model for reproducibly triggering significant levels of lameness. In Pilot Study #1 using broilers from Line C grown on wire flooring, adding the Biomin probiotic PoultryStar® to the feed reduced the percentage of lameness by half when compared with broilers that received the control diet alone. In Pilot Study # 2 using broilers from Line B grown on wire flooring, adding the PoultryStar® probiotic reduced the percentage of lameness to 8% when compared with 28% lameness in broilers that received the control diet alone. The objective of this study was to …

Physio-Chemical And Sensory Properties Of A Nutrient-Fortified Extruded Product, Tajudini Lassissi Akande

Graduate Theses and Dissertations

Protein malnutrition is responsible for half the deaths of children under the age of five each year in developing countries. More than 4%, 26%, and 70% of children with protein malnutrition live in Latin America/the Caribbean, Africa, and Asia, respectively. The objective of this research was to develop a novel snack made with millet, black eye bean (from Niger Republic), and rice flour fortified with soybean meal protein using extrusion technology. Proximate analysis of the four flours was carried out to determine their chemical composition. Central composite design (CCD) was used to obtain best extrusion conditions to develop a protein-enriched …

Evaluating The Formation Of Bacterial Chondronecrosis With Osteomyelitis In Broilers Raised On Portable Wire Floor Models, Alex David Gilley

Graduate Theses and Dissertations

Rearing birds on wire flooring has proven to be an effective method for consistently triggering significant levels of lameness in broilers, and while the wire flooring model has been proven effective, more mobile wire floor models have been developed to compliment the facility management conditions within commercial genetic selection programs. The mobile wire floor models have been titled "speed bumps", and through previous evaluation have resulted in significantly higher levels of lameness in broilers compared to litter floor shavings. The current experiment contains two studies (studies 1 and 2). Both studies involved comparing leg weakness between broiler strains; while in …

Extraction And Purification Of Gamma-Tocotrienol From Rice Bran Oil Deodorizer Distillate, Mary Kordsmeier

Graduate Theses and Dissertations

The tocols (alpha-, beta-, gamma- and delta- tocopherols (T); alpha-, beta-, gamma- and delta-tocotrienols (T3)) make up the vitamin E family of antioxidants. Tocols have many health benefits. Gamma-T3 has been shown to protect against harmful radiation effects in mice. During rice bran oil refining up to 90% of tocols in rice bran are lost to the deodorizer distillate. The objective of this study was to optimize parameters for analyzing and isolating tocols from rice bran oil deodorizer distillate (RBODD). NP-HPLC analysis of tocol standards was optimized by testing ten mobile phases. Tocol extraction was optimized by testing three concentration …

Local Food And Agriculture Awareness: The Literacy Of Local Produce And Agriculture In Northwest Arkansas, Kyle Colton Flynn

Graduate Theses and Dissertations

The Center for Disease Control and Prevention (CDC) suggests that adolescents and children, both male and female, are failing to meet the daily fruit and vegetable consumption requirements (Kim et al., 2011; Upton et al., 2012; Harris et al., 2012). Other studies have shown that with increased exposure and availability of produce, students (K-5) tend to consume more fruits and vegetables (Cullen et al., 2009; Evans et al., 2012). The purpose of this study is to identify whether Northwest Arkansas eleventh grade high school students possess experience and knowledge of local produce and agriculture. Out of 1054 students enrolled at …

Influence Of Horn Flies And Breed Type On Milk Production, Calf Production Traits, Pasture Behavior, And Temperament Measurements In Beef Cattle, Angela Rene Mays

Graduate Theses and Dissertations

An experiment conducted in El Reno, Oklahoma during the fly season (May - September/October) evaluated the effects of horn flies on milk production, calf performance, and pasture behavior and temperament measurements of beef cow calf pairs. Cows (n = 53) sired by Bonsmara (BONS; n = 7), Brangus (BRAN; n = 13), Charolais (CHAR; n = 8), Gelbvieh (GELV; n = 5), Hereford (HERF; n = 12), and Romosinuano (ROMO; n = 8) from Brangus dams and their Angus sired calves (n = 51) were used in the study. Horn fly counts (HFC) and milk yield and quality estimates were …

Effects Of Using Canola Meal As A Protein Source In Broiler Diets, Charles Danny Bradley Jr

Graduate Theses and Dissertations

Six experiments were conducted to evaluate the response of broilers fed canola meal. Experiment 1 assessed performance and carcass yields when broilers were fed various combinations of canola and soybean meal in nutritionally balanced diets based on digestible amino acid values. The results suggested that canola meal can be used in isocaloric diets as a partial replacement for Soybean meal.

Experiment 2 assessed broiler performance and carcass yields when using various levels of canola meal in broiler diets with a constant level of supplemental poultry oil. The resulting data suggested when diets are formulated with a constant level of supplemental …

Resources And Relationships: Food Insecurity And Social Capital Among Middle School Students, Don Edward Willis

Graduate Theses and Dissertations

This study examines the relationship between food insecurity and Social capital among 5th-7th graders attending an intermediate school in Northwest Arkansas where nearly 70 percent of students participate in the free or reduced lunch program. The central research questions are: Does Social capital have a direct impact on children's food insecurity? And, does Social capital mediate the influence of negative circumstances on children's food insecurity? This study finds that Social capital does have a significant association with food insecurity, even when controlling for multiple demographic and circumstantial factors. However, there appears to be no mediation of circumstance by Social capital. …

Relationship Of Lactate Dehydrogenase & Prolactin Genotypes To Immune Function, Growth, And Composition Of Replacement Heifers Grazing Tall Fescue, Christina Marie Turner

Graduate Theses and Dissertations

Objectives of this research were to determine effects of LDH enzymatic activity and circulating PRL on immune response, growth, composition, and reproduction, and to determine the effects of single nucleotide polymorphisms of LDH and PRL on immune function, growth and carcass traits, cyclicty, and fecundity of replacement heifers grazing endophyte infected tall fescue. Eighty-nine Angus based heifers had physical and ultrasound measurements along with blood samples collected at weaning, yearling, and prebreeding. Estrus detection was conducted for 10 d post each collection period, except prebreeding. Pregnancy status was verified after AI and again after bull removal. Heifers were maintained on …

Development Of A Predictive Modeling System For Validation Of The Cumulative Mirobial Inactivation Of The Salmonellae In Pepperoni Utilizing A Non-Pathogenic Surrogate Microorganism (Enterococcus Faecalis), Scott Donald Stillwell

Graduate Theses and Dissertations

Salmonellosis is the most frequently occurring bacterial foodborne illness in the United States and the human case rate has not improved for the past two decades. The federal agency responsible for oversight of meat and poultry processors has announced the intent to extend existing pathogen reduction performance standards for Salmonella spp. to cover all classes of products including fermented sausages that are currently produced under HACCP plans that are validated for control of Escherichia coli O157:H7. The proposed regulatory modifications will require processors to revalidate HACCP plan controls to achieve either a 6.5 or a 7.0 log10 inactivation of the …

An Estimation Of Available Cellulosic Biomass In Ten Counties In Northeastern Arkansas From 1999-2011, Thomas Jenkins

Biological and Agricultural Engineering Undergraduate Honors Theses

The purpose of this research is to explore the possibility of siting a biorefinery that produces cellulosic ethanol in the Delta region of Arkansas, which is the main agricultural area of the state. Four major crops that the state of Arkansas produces on a yearly basis that could potentially be used for cellulosic ethanol production are: corn, rice, sorghum, and soybeans. This research will result in the generation of maps that will be useful in quantifying feedstock produced in the Delta region of Arkansas, which can be used by a biorefinery. An actual site will not be chosen based strictly …

Scaffolding For Human Pluripotent Stem Cell Lineage Specification, Thanh Dai

Biological and Agricultural Engineering Undergraduate Honors Theses

Current research regarding stem cells is the premise behind this project. These cells have the potential to develop into any kind of cell in the human body. Due to the scarcity of transplantable pancreas and/or pancreatic beta cells, the production of pancreatic insulin-producing cells from human embryonic stem cells (hESCs) has emerged as one of the most attractive cell therapy strategies for insulin deficient diabetes treatment. The aspect of hESC research that the project focused on was the environment or foundation the hESCs grew in. A key step to pancreatic beta cell production from hESC differentiation or growth is establishing …

Journal Of Food Law & Policy - Spring 2013, Journal Editors

Journal of Food Law & Policy

No abstract provided.

The Forgotten Half Of Food System Reform: Using Food And Agricultural Law To Foster Healthy Food Production, Emily Broad Leib

Journal of Food Law & Policy

America is facing widespread problems with its food system, including environmental harms due to externalities from industrial farms; the increasing amount of "food _miles" traveled by the products that make up our daily meals; and the growing size and complexity of recent outbreaks of foodborne illnesses. Indeed, the entire system that covers the life cycle of food, through production, processing, distribution, consumption, and food waste management, is in crisis. One of the most disturbing of these well-documented problems with the industrial food system is the increase in rates of obesity and diet-related illnesses. Obesity rates in the U.S. have more …

The U.S. Department Of Agriculture As A Public Health Agency? A "Health In All Policies" Case Study, Lindsay F. Wiley

Journal of Food Law & Policy

The "war on obesity" is now well into its second decade. What began as an effort to encourage medical doctors to screen and treat patients whose weight put them at risk for health problems has transformed into a much broader public health campaign to address the root causes of obesity. A growing number of state, territorial and local health departments are currently exploring new ways to promote healthy eating and physical activity. At the federal level, the U.S. Centers for Disease Control and Prevention (CDC) has made "nutrition, physical activity and obesity" a top priority.

An Analysis Of Intradistrict Funding Equity In Rural And Urban School Districts, James Lynn Woodworth

Graduate Theses and Dissertations

After a long process of judicial action, states have revised the education funding distribution systems to meet the legal requirement of providing both horizontal and vertical funding equity between districts (interdistrict) in the state. A major part of the judicially required reforms was a shift to weighted student funding or funding which provides differential amounts of education funding dependent on the estimated needs of students based on their individual characteristics. However, little research has been done to examine the equity of the funding distribution systems between schools within districts (intradistrict).

Intradistrict funding inequities are likely to persist in districts today …

Molecular Diagnosis Of Metabolic Fast Growth Related Diseases In Broiler, Adnan Ali Khalaf Al-Rubaye

Graduate Theses and Dissertations

Pulmonary Hypertension Syndrome (PHS) and lameness are important metabolic diseases that affect rapidly growing broilers. The research reported in the first section of this dissertation focused on developing qPCR assays to identify differences in the expression levels of four candidate genes possibly associated with PHS: angiotensin II type 1 receptor (AGTR1): urotensin receptor 2D (UTS2D); serotonin receptor/transporter type 2Bn (HTR2B); and angiotensinogen cleaving enzyme (ACE). Expression levels of these candidate genes were examined in four different tissues. We established ribosomal protein S14 (RPS14) and RNA polymerase subunit 2B (RP2B) as suitable reference genes because they showed the most consistent deltaCt …

Animal Science E-Newsletter, May 2013, University Of Arkansas, Fayetteville. Department Of Animal Sciences

Animal Science e-Newsletter

No abstract provided.

United States Food Law Update: Shrouded By Election-Year Politics, State Initiatives And Private Lawsuits Fill In The Gaps Created By Congressional And Agency Ossification, A. Bryan Endres, Lisa R. Schlessinger, Rachel Armstrong

Journal of Food Law & Policy

Observers of food law in the 2012 presidential election year witnessed a dramatic slowing of federal initiatives-perhaps arising from a desire by both Congress and the administration to avoid upsetting critical constituent groups during a year seemingly dominated by campaigns and endless talking points. For example, Congress failed to take action on a unique compromise between what some had considered mortal enemies-the Humane Society of the United States and United Egg Producers-that would implement a federal animal welfare standard for laying hens in return for abandoning ballot measures in various states. Similarly, the FDA waited until the early days of …

Novel Method For Sequential Batch Recovery Of Biomass From A Helical Photobioreactor, Matthew Hurst

Chemical Engineering Undergraduate Honors Theses

This study developed and evaluated a novel method to recover the microalgae species Arthrospira platensis from a closed helical photo bioreactor system. A recovery apparatus was designed and shown to increase recovery by 40% via periodic online recovery runs during exponential growth phase of biomass. Considerations for the apparatus design included the low shear tolerance of the algae and the necessity for a closed system in order to monitor CO2 consumption. The recovery method draws on methods used for large scale recovery as reported in literature by Vonshak and Shimmatsu [1], [2]. This work seeks to improve reactor biomass yield …

Genetic Diversity Of Seed Dormancy And Molecular Evolution Of Weedy Red Rice, Te Ming Tseng

Graduate Theses and Dissertations

Rice is the grain with the third-highest global production. In the US, Arkansas is the largest rice producing state; however, an estimated 62% of the rice fields in the state are infested with red rice, and can cause up to 80% yield reduction in rice. Among its weedy traits, seed dormancy plays an important role in its persistence, and helps red rice escape weed management techniques thereby increasing the red rice soil seedbank. Red rice also has the potential to hybridize among themselves and with cultivated rice, thus resulting in diverse phenotypes and genotypes. In this study we measured variation …

Groundcover Management System And Nutrient Source Impact Physical Soil Quality Indicators In An Organically Managed Apple Orchard, Neal Mays

Graduate Theses and Dissertations

In March 2006, four groundcover management systems (GMS) and two nutrient sources (NS) were implemented for their ability to alter the soil physical condition of a newly established, organically managed apple (Malus x domestica Borkh.) orchard. Annual applications of municipal green compost (GC), shredded office paper (SP), wood chips (WC), and mow-blow (MB) grass mulch were utilized as GMS, and NS supplied to trees were from composted poultry litter (PL), a commercial organic fertilizer (CF), or an untreated control (NF) in a 4x3 factorial study. An established, conventionally-managed orchard was located adjacent to the organic research orchard on the same …