Digital Commons Network^™

Impacts Of A Mixed Ungulate Community On Aspen Forests: From Landscape To Leaf, Aaron C. Rhodes

Theses and Dissertations

This dissertation explores the differential effects of an ungulate community (cattle, mule deer, and American elk) on aspen (Populus tremuloides) regeneration pre- and post-fire disturbance. It's first chapter examines the differential effects of cattle, mule deer, and American elk on aspen regeneration across variable topography, climate and forest type; aspen dominant to conifer dominant subalpine forests. We found that each ungulate species, if sufficiently numerous, can cause aspen regeneration failure. Also, high elevation, southern aspect and high winter snow pack increase resilience to ungulate herbivory. Chapter two compares the efficacy of four methods of estimating ungulate impact on …

The Effects Of Physical Activity On Middle School Students' Self-Esteem, Marissa Ruchim

Theses and Dissertations

The purpose of this study was to investigate the relationship between student physical activity levels and how they affect self-esteem. The study analyzed the differences in participants’ self-esteem on days they had PE versus days they had Encore class (i.e. journalism, drama, art, global awareness, stem, and music). Participants were 25 students in an intact sixth-grade PE class (10 girls, 15 boys) at a middle school in a suburb of Chicago. Data were collected from two sources, pedometers recording number of steps taken daily and scores on Harter’s Global Self-Worth Scale, a measure of self-esteem. Data were analyzed using SPSS …

Addressing Mental Health, Substance Abuse, And Recidivism In The Juvenile Justice System, Danielle N. Gieschen

Theses and Dissertations

Research has shown links between mental health concerns, substance abuse concerns, and recidivism for youth. However, the vast majority of studies have not examined the impact that receiving services or treatment compliance has on this relationship. In this study, mental health concerns, mental health treatment, alcohol and substance abuse concerns, alcohol and substance abuse treatment and recidivism within the juvenile justice system were examined. The electronic and paper probation files and the paper court files for 77 youth were examined to determine the impact that receiving mental health or substance abuse services has on reducing the likelihood of recidivism. Furthermore, …

The Physical And Psychological Effects Of Standing Desks In Office Workers, Hannah Dohm

Theses and Dissertations

PURPOSE: The purpose of the study was to determine differences in energy expenditure between sitting and standing conditions in typically sedentary office workers. A secondary purpose of this study was to determine if there are mindset differences with regards to job boredom, job stress, and job satisfaction between conditions. METHODS: Participants (N = 26, 4 males and 22 females) were from two moderately sized communities in the Midwest that had standing desk options available to them. Data was collected using BodyMedia SenseWear armbands for energy expenditure and self-reported Likert-scale surveys for psychological data. Intake data included sex, age, height, weight, …

Dietetic Students' Lived Experience Working With Preceptors: A Phenomenology, Mary-Pat Maciolek

Theses and Dissertations

The majority of the research conducted on the preceptor model has focused on Allied Health professions other than dietetics. This phenomenological study sought to understand the preceptor experience in dietetics education as revealed by the individuals who had the experience. The purpose of this phenomenological study was to describe the preceptor experience from the perspective of dietetic education graduates in order to understand the impact of the preceptor experience component of the educational process on the professional growth of dietetics education graduates. The August 2016 ACEND Update reveals no significant progress in the match rate for applicants into supervised practice …

Fermenting Solutions To New World Problems: Bioremediation Of Blue Agave And Cocoa Pod Wastes, Daniel Hart

Theses and Dissertations

Waste, minimizing it, and maximizing profit from it are major foci of most agricultural production processes today. Waste from two major production processes, namely tequila production and cocoa production, share several characteristics. Both these processes are still carried out as they have been for hundreds of years. They are both relatively concentrated in location; all tequila is produced in a small region of Mexico while cocoa pods only grow in tropical environments within 18° of the equator. In addition, both processes used to produce these commodities remain fairly inefficient; they generate huge amounts of waste that goes mostly unused. With …

Physical Activity And Associated Energy Intake In Undergraduate College Students, Erin Marie Fejes

Theses and Dissertations

Background: College students often develop unhealthy eating habits. Poor eating habits can lead to chronic disease.

Methods: Energy intake and physical activity data from 35 undergraduate students enrolled in a 100-level kinesiology class were recorded and analyzed. Energy intake data was self-reported, while physical activity data was recorded via an activity tracker.

Results: Data points were analyzed twice: each day separately and as averages for each participant. When analyzed as averages, grams of total fat and grams of carbohydrate were the most significantly correlated with minutes of moderate to vigorous+ physical activity (both p<0.01). When analyzed by day, grams of protein, total fat, saturated fat, carbohydrate, sugar, and fiber were all found to be significantly correlated with minutes of moderate to vigorous physical activity to the p≤0.01 level.

Conclusion: An increase in physical activity …

Desert Within A City: Exploring The Relationship Between Food Security, Diet, And Body Mass Index, Jamey Ann Baietto

Theses and Dissertations

Background: Food deserts are areas of decreased access to nutritious and affordable foods. Residing within a defined food desert is thought to decrease consumption of produce, dairy, and whole grains and increase consumption of energy-dense foods as well as body mass index (BMI).

Objective: The purpose of this study was to determine the effects of the level of food security on consumption of fruits, vegetables, dairy, whole grains, high-sugar foods, high-fat foods, and BMI.

Design: A one-time, self-administered data collection packet was sent to residents of a food desert. The Dietary Screener Questionnaire was utilized to determine the average daily …

Mechanism Of Action Of American Ginseng And Its Components In The Treatment Of Ulcerative Colitis, Anusha Chaparala

Theses and Dissertations

Inflammatory bowel diseases (IBD), mainly ulcerative colitis (UC), Crohn’s disease (CD), are chronic, idiopathic, inflammatory diseases of the gastrointestinal tract affecting millions of people worldwide. The incidence of IBD is steadily increasing in the modern world due to changes in dietary habits and other environmental influences that originated from industrialization. The etiology is poorly understood but is believed to be a combination of genetic predisposition, environmental factors, and overactive immune system. UC is characterized by inflammation and ulceration of colonic mucosa and rectum and has a higher incidence than CD. Aside from severely affecting the quality of life of the …

The Effects Of Physical Activity, Sedentary Time, And Atherosclerosison Fluid Flow In The Lumbar Intervertebral Disc, Jennifer Ann Bowden

Theses and Dissertations

Physical activity impacts health and disease in multiple body tissues including the intervertebral discs. Fluid flow within the disc is an indicator of disc health that can be observed using diffusion weighted magnetic resonance imaging. We monitored activity levels of 26 participants, age 35 to 55 yrs, using Actigraph accelerometers for four days to evaluate vigorous-intensity activity, moderate to vigorous-intensity activity, and sedentary time. Participants underwent structural and diffusion weighted magnetic resonance imaging to evaluate intervertebral disc health and fluid flow. They also underwent bone density scans, carotid artery ultrasounds, a treadmill test, and a physical exam for pain, range …

Scheduling Recess: Perceptions Of Lunchroom Supervisors, Teachers, And Principal, Reilly Layne Mckinnis

Theses and Dissertations

Purpose

The purpose of this study was to ascertain the perceptions of elementary school staff in regards to scheduling recess after or before lunch and the effect each schedule had on students.

Methods

This research was conducted in Fall 2016 when a Midwestern elementary school had recess after lunch (RAL) and in Spring 2017 when the same school had recess before lunch (RBL). A mixed methods approach was used. Nineteen teachers completed a Likert-scale survey, six of whom completed both the pre- and post-survey. One principal and five lunchroom supervisors participated in individual semi-structured interviews pertaining to their perceptions of …

Evaluating The Evidence And Assessing Registered Dietitian Nutritionists' Perceptions Of The Complex Renal Dietary Restrictions, Alyssa Lee Welte

Theses and Dissertations

The renal diet is often regarded as challenging to teach and follow, and can easily lead to additional complications, including malnutrition. Recent trends in the literature have suggested a liberalization in the renal diet, though no studies have assessed whether Registered Dietitian Nutritionists (RDNs) are comfortable making this change. An original, cross-sectional survey was created for this study. 187 renal dietitians completed the survey which revealed that only 15.3% of participants felt it is acceptable to liberalize the standard dietary restriction on fruits and vegetables, and 13.6% said the same about the bean and legume restriction. 19.9% are extremely likely …

Chlamydomonas Reinhardtii, A Model For Quorum Sensing At The Interkingdom Interface, Timothy Charles Haire

Theses and Dissertations

Microbial communities significantly impact the processes of the eukaryotic hosts they colonize. In many cases, symbiotic organisms both pathogenic and mutualistic coordinate their efforts through a process called quorum sensing (QS). QS is driven by low-molecular weight signals that regulate gene expression at threshold inducer concentrations, allowing phenotypic switching to be driven by cell density. These quorum sensing signals are subject to eukaryotic perception, and quorum associated phenotypes can directly influence the growth and development of eukaryotes. Eukaryotic perception of quorum sensing signals has been chiefly studied in plants, and to a lesser extent mammalian systems, yet no delineated model …

A Longitudinal Study Of Privacy Awareness In The Digital Age And The Influence Of Knowledge, Therese L. Williams

Theses and Dissertations

Privacy, in the modern connected world, has become a much discussed topic in society ranging from privacy concerns to impacts, attitudes, practices and technologies. In today’s environment of vast social media and revelations of government spying, personal privacy is being highlighted as either non-existent or something that can be achieved to different degrees with knowledge or awareness of how our private information is collected and used. This research strives to answer the question "Using Alan Westin's privacy categories, what is the general awareness of privacy issues in social media and smartphone usage and how does it change when knowledge is …

A Privacy Calculus Model For Personal Mobile Devices, Gregory J. Bott

Theses and Dissertations

Personal mobile devices (PMDs) initiated a multi-dimensional paradigmatic shift in personal computing and personal information collection fueled by the indispensability of the Internet and the increasing functionality of the devices. From 2005 to 2016, the perceived necessity of conducting transactions on the Internet moved from optional to indispensable. The context of these transactions changes from traditional desktop and laptop computers, to the inclusion of smartphones and tablets (PMDs). However, the traditional privacy calculus published by (Dinev and Hart 2006) was conceived before this technological and contextual change, and several core assumptions of that model must be re-examined and possibly adapted …

The Impacts Of Yeast Fermentation And Bacillus Subtilis Dietary Products On Sperm Quality And Semen Microbiota Of Aged White Leghorn Roosters, Midian Nascimento Dos Santos

Theses and Dissertations

Alternatives to antibiotic growth promoters have been widely exploited due to concerns about antimicrobial resistance. These feed additives improve growth, in part, by modulating intestinal microbiota. However, their impact on male reproductive performance is not well elucidated. Therefore, the objective of this study was to evaluate the impacts of a yeast fermentation product (YP) and Bacillus subtilis on rooster semen quality and microbiota. Dietary supplementation of YP linearly increased the concentration of yeast and bacteria in semen, whereas it linearly decreased sperm motility, suggesting that bacteria attached to yeast were excreted from the gut, contaminated semen at the cloaca and …

Benefits Of Fun With Food Camp On Undergraduate Nutrition Students' Education, Cecily Bernice Young

Theses and Dissertations

Undergraduate programs in nutrition and dietetics do not require experiential learning as part of their curriculum. This study examines the benefits of working as a camp counselor at a weeklong kids’ cooking camp on undergraduate nutrition students. Observations and surveys were used to determine the effects of the camp as an experiential learning scenario on nine undergraduate nutrition students at Mississippi State University. The study found that the experience provided academic benefits through reinforcing classroom knowledge, professional benefits through career discernment, and personal benefits through the development of softs skills such as problem solving and time management. The study can …

Body Fat Determination Of Stock-Type Horses In Varying Body Condition By Carcass Dissection, Rump Fat Thickness, And Deuterium Oxide Dilution And Fatty Acid Composition Of Adipose Tissues, Emily Nicole Ferjak

Theses and Dissertations

The primary objectives of the study were to compare 2 body fat (%, BF) prediction methods for stock-type horses by rump fat thickness (RFT) and D2O dilution with actual tissue fat analysis by near-infrared spectroscopy (NIR) and to identify the relationships among BF, BCS, and physical measurements. Secondary objectives were to determine the fatty acid (FA) composition of mesenteric (MS), cardiac (CD), subcutaneous (SC), intermuscular (IM), and leaf fat (LF) and to identify relationships between of FA composition and BCS in horses. Results indicated that D2O dilution is an accurate predictor of BF, and RFT alone does not accurately predict …

Effects Of Feed Additive Strategies For Commercial Broiler Production And Gut Health, Courtney Elizabeth Ennis

Theses and Dissertations

The total removal of antibiotic growth promoters (AGP) from poultry feed is underway in the United States. Feed additive strategies will be utilized to maintain the efficient growth, health, and economic value found with current commercial broiler production. Experiment 1 investigated the effects of feeding an encapsulated butyric acid and zinc product (EBAZ) at 3 inclusions on d 0- 49 Ross x Ross 708 male and female broiler performance, blood chemistry, and cecal short-chain fatty acid content. These data suggest that EBAZ can be safely included at 0.5 g/kg and at 2.5 g/kg into diets for Ross x Ross 708 …

Evaluating Different Approaches For The Delivery Of Probiotics To Broilers At Different Life Stages, Claudia Duneska Castaneda Bustillo

Theses and Dissertations

Probiotics are an alternative to increase broiler productivity and flock health. For this reason, the objective of the first study was to evaluate commercially available Bacillus spp. based probiotic products on their ability to reduce Salmonella Heidelberg, in vitro. Results showed that most products reduced the lower concentrations of S. Heidelberg and maintained a reduction for up to 8 h. The second study was conducted to determine if bacterial colonization occurred in a broiler chick after in ovo injection. Using bioluminescence, it was demonstrated that bacteria could migrate and colonize the embryo within 2 h after in ovo injection into …

Evaluation Of Foliar Fertilizer Or Cytokinin Mixtures In Combination With Common Postemergence Soybean Herbicides, Huntington Tyler Hydrick

Theses and Dissertations

In an effort to reduce application costs and to integrate plant health management strategies in soybean, growers may combine POST herbicides with foliar fertilizers or cytokinin mixtures. Field experiments were conducted at the Delta Research and Extension Center in Stoneville, MS in 2015 and 2016 to evaluate soybean [Glycine max (L.) Merr.] injury, weed control, and agronomic performance when combining blended or single-nutrient foliar fertilizers with POST herbicide applications. Field experiments were also conducted at the Delta Research and Extension Center in Stoneville, MS in 2015 and 2016 to evaluate the influence of cytokinin mixtures on soybean injury and weed …

Incidence Of Salmonella Spp. In Farming Environments And Food Facilities By Improved Detection, Lurdes G. Siberio-Perez

Theses and Dissertations

Environmental samples from food processing facilities and production (farms) were taken and analyzed for the presence of indicator organisms and Salmonella spp. on food contact (FC) and nonood contact (NFC) surfaces. Salmonella was isolated from both FC and NFC surfaces of a fruit and catfish-processing plant environment, but not from a dairy processing plant or from produce packaging facility environments. Scatter plots did not show a relationship between indicator organisms and the presence of Salmonella in processing environments, regardless of the facility/environment. Salmonella ser. Gaminara and Salmonella ser. Give were prevalent in the fruit processing environment. Persistence could not be …

The Effects Of High-Intensity Interval Training On Division I College 800/1500m Runner's, Ffion Gwenith Price

Theses and Dissertations

Middle distance runners are always searching for ways to improve performance. This study was conducted to see if high intensity interval training (HIIT) on a cycle ergometer could help improve overall performance within 800/1500m runners. It was hypothesized that HIIT would increase performance, through decreasing 1500m times and increasing time to fatigue. Athletes completed two HIIT sessions every week for four weeks. Pre- and post- performance tests: incremental treadmill test (run to volitional exhaustion) and a 1500m time trial. In addition to performance, athlete’s stride length and stride frequency during the 1500m time trial were recorded. No significant changes were …

Recreational Firewood Movement As A Vector Of Non-Native Woodborers In Mississippi, Matthew John Thorn

Theses and Dissertations

Recreational firewood collected from campers in Mississippi State Parks was investigated for factors associated with insect presence and their diversity. Insects were found in 20% of firewood and evidence of past feeding was found in 64.8%. Representatives of 35 families of insects were reared from collected firewood. These included representatives of Buprestidae, Cerambycidae, Curculionidae, Formicidae, and Rhinotermitidae. The effects of firewood age, moisture content, and source were also examined as effects on insect presence in firewood. At the same time, a survey of campers’ beliefs and attitudes about non-native woodborers was conducted. Exposure to public awareness campaigns had the strongest …

Phosphorus Occurrence And Origin In The Mississippi River Valley Alluvial Aquifer In Northwestern Mississippi, Claire Elise Rose

Theses and Dissertations

The median total dissolved phosphorus concentration (0.41 mg/L P) of groundwater from the Mississippi River Valley alluvial aquifer exceeded the U.S. Environmental Protection Agency’s stream nutrient criteria (of 0.1 mg/L P) and the national background for phosphorus in groundwater (0.02 mg/L P). A general association between elevated phosphorus and dissolved iron concentrations suggests that reducing conditions that mobilize iron in the aquifer also may facilitate transport of phosphorus. These elevated concentrations of phosphorus may indicate phosphorus in the study area may be concentrated through irrigation return flow and groundwater discharge, and may contribute to the Gulf of Mexico hypoxic zone. …

Cultural Model Of Infant Feeding Among Women In Rural And Urban Bangladesh, Rumana Rahman

Theses and Dissertations

Cultural practices influence infant feeding choices and have a significant impact on children’s physiological growth and cognitive development. This study examined cultural knowledge of infant feeding among woman in rural and urban Bangladesh. The findings of this research indicated that there was sufficient agreement among the respondents to constitute a single shared cultural model of infant feeding among participants in Bangladesh. Results also indicated intracultural variation within this model in terms of duration of exclusive breastfeeding, age at introduction of water, and weaning practices. Better understanding infant feeding can inform future programs aimed at improving early nutrition, growth, and development …

Efficacy Of Bentonite And Calcium Montmorillonite Clays At Reducing Aflatoxin M1 Transfer In Lactating Holsteins, Sarah Caitlin Allen

Theses and Dissertations

Aflatoxins are naturally occurring carcinogens found on grains, particularly in warmer climates. Because of their carcinogenic properties, they are strictly regulated and are only allowed in minimal amounts. Aflatoxin B1, the most potent naturally occurring carcinogen known, is metabolized in the liver to form aflatoxin M1, which is present in the milk of lactating animals. If aflatoxin concentrations are elevated above legal limits, the milk cannot be used for human consumption. Because of this, research has been conducted to evaluate ways to mitigate its absorption in the animal and prevent transfer to the milk. One such way is through the …

Temperature Effects On Warm- And Cool-Season Turfgrass Species And Cultivars, Ethan Todd Flournoy

Theses and Dissertations

Research was conducted using the Soil-Plant-Atmosphere-Research (SPAR) units at Mississippi State University, Starkville, MS to investigate temperature effects on warm- and cool-season turfgrasses. Data collected include clipping yield, total root biomass, and relative chlorophyll index (RCI). Cultivars and species in the study included: ‘Latitude 36’, ‘Tifway’, ‘MSB-285’, and ‘TifEagle’ bermudagrass, ‘Meyer’ zoysiagrass, ‘Penn A1/A4’ and ‘Penncross’ creeping bentgrass, ‘Midnight’ Kentucky bluegrass, ‘Fiesta 4’ perennial ryegrass, and ‘Falcon V’ tall fescue. Grasses were grown in the SPAR units at varying day/night temperature regimes. Clipping yield was collected every three days, and regression was used to determine the temperature at which clipping …

Management Of Plant-Parasitic Nematodes Using Gene Manipulation And Biological Nematicides Biological Nematicides, Weasam Adnan Radhi Aljaafri

Theses and Dissertations

Soybean cyst nematode (H. glycines), reniform nematode (R. reniformis), and Root-Knot nematode (M. incognita) are three damaging plant-parasitic nematodes on soybean. Syntaxin proteins are involved in the process of membrane fusion. T wo G. max syntaxin genes (Gm-SYP22-1, and Gm-SYP22-2) that were similar in amino acid composition have been found to contribute to the ability of Glycine max to defend itself from infection by the plant parasitic nematode Heterodera glycines. Syntaxin genes SYP22-1 and SYP22-2 were identified to be expressed specifically in syncytia undergoing a resistant reaction to H. glycines parasitism. The Gm-SYP22-1 and Gm-SYP22-2 genes were isolated by molecular …

Impact Of Nanotechnology-Based Semen Purification On Reproduction Of Gilts And Developmental Performance Of Offspring, Casey Lynn Durfey

Theses and Dissertations

Semen contain a heterogeneous population of viable and non-viable (damaged) spermatozoa. Proportions of non-viable spermatozoa interfere with male fertility, with available techniques unable to selectively remove prior to breeding. Nanobiotechnology may allow removal, enriching semen with high quality spermatozoa for improved productivity. Here, we applied double nanopurification with boar semen using functionalized magnetic nanoparticles. Non-viable and viable spermatozoa were magnetically separated and verified through various microscopy imaging. Viable (nanopurified) spermatozoa showed no additional damages. Nanopurification did not interfere with sperm motility and viability, with beneficial effects on motion parameters. Nanopurified spermatozoa maintained fertility following insemination, with resulting offspring indicating no …