Digital Commons Network^™

Interim Sediment Management Plan For First Dam, Logan River, Thirumurugan Bose

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

Sediment is a serious problem in the management of dams all over the world. In this project an interim sediment management plan for First Dam, on the Logan River in northern Utah, is discussed. The objective of the plan is to control the sediment budget of the reservoir in such a way that other reservoir maintenance activities (e.g., unusual draw downs for structural repairs) will produce minimal downstream environmental impacts on water quality and aquatic resources.

This report presents a detailed literature review of the various sediment management practices used for reservoir sediment control. It also discusses the downstream effects …

Methods For Detection Of Salmonella Spp., Parichaya Attaphongse

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

Worldwide concern about food safety and associated health costs is increasing, and Salmonella contamination of foods is one of the most important causes of foodborne disease outbreaks. Although conventional detection methods for Salmonella offer high sensitivity and low cost, they require many different steps and are very time consuming. Ideally, methods to detect Salmonella in foods should be rapid, provide high specificity and sensitivity, be cost-effective, and low labor-intensive. Many rapid tests have been developed to address these goals, including DNA-based tests such as nucleic acid hybridization and PCR, immunoassay-based tests such as ELISA, ELF A and immunomagnetic method, and …

Prevention Of Pigment Deterioration And Lipid Oxidation In Ground Beef And Pork, Preetha Jayasingh

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Fresh beef was modified-atmosphere packaged in carbon monoxide or oxygen to prolong red surface color. After comparison of several packaging method using carbon monoxide, steaks pretreated with 5% carbon monoxide for 24 hours and then vacuum packaged had the best combination of color and microbial stability (5 weeks), with the least potential for carbon monoxide inhalation.

In the evaluation of ground beef in high-oxygen, modified-atmosphere-packaging, thiobarbituric-acid numbers increased over time, and the flavor was disliked slightly after 6 or 10 days of storage at 2° Celsius.

The antioxidant effect of milk-mineral was tested in raw and cooked ground pork stored …

Rapid Detection Of Salmonella Without Enrichment, Emily J. Harrington

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Salmonella is one of the leading foodborne pathogens causing illness today. Because of this, Salmonella rapid detection methods are under immense study for use in food. The traditional method, using the Food and Drug Administration- approved Bacterial Analytical Manual procedure, takes 4-6 days for Salmonella detection in food. Other rapid methods still take at least 16 h for detection due to their enrichment steps.

The hypothesis of this study was that the use of immobilized antibodies coupled with polymerase chain reaction (PCR) can be used for the rapid capture and detection of Salmonella spp. in food without the need for …

Development And Characterization Of Eukaryotic Biomimetic Liposomes, Bradley Jay Taylor

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study developed and characterized phospholipid vesicles, or liposomes, that mimic cell surfaces. Microemulsified liposomes contained biotinylated phosphatidylethanolamine, allowing them to be immobilized to avidin-coated glass. Laminin (LN), glycosphingolipids (GMl and GM3), and Escherichia coli's mechanosensitive channel of large conductance (EcoMscL) were embedded into liposome membranes. It was determined whether these embedded molecules exhibited their physiological roles of adhesion, cell recognition, and mechanosensation, respectively. Confocal laser scanning microscopy (CLSM) was employed to examine the interaction of fluorescently probed proteins, toxins, and bacteria with the immobilized microemulsified liposomes. Capture of individual and simultaneous multiple species of bacteria by GMl, GM3, …

Comparative Effects Of Sodium Levulinate And Sodium Lactate On Microbial Growth, Color, And Thiobarbituric Acid (Tba) Values Of Fresh Pork And Turkey Sausages During Storage, Mihir N. Vasavada

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study compared the effects of 1.4 or 2.7% sodium levulinate or sodium lactate on aerobic plate count (APC), color, pH, and TBA value of fresh pork and turkey sausage. Both sodium lactate and levulinate inhibited growth of aerobic microorganisms during storage, compared to controls. Bacteriostatic effects of sodium lactate were dose dependent, wherein 2.7% lactate was significantly more antimicrobial than 1.4% lactate. This was not the case for sodium levulinate, where 1.4% sodium levulinate was as inhibitory to microbial growth as 2.7% sodium levulinate. Additionally, 1.4% sodium levulinate was as inhibitory to microbial growth as the higher level (2.7%) …

Comparison Of Color And Thiobarbituric Acid (Tba) Values Of Cooked Hamburger Patties And Top Sirloin Steaks After Storage Of Fresh Beef Chubs And Raw Steaks In Modified Atmospheres Of 80% Oxygen Or 0.4% Carbon Monoxide, Liza John

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study compared the effect of packaging method (0.4% carbon monoxide, 80% oxygen or vacuum), storage time (7, 14 and 21 days) and internal cooking temperature 49, 57, 66, 71 and 79°C) on color and thiobarbituric acid (TBA) values of top sirloin steaks and ground beef patties. Ground beef was obtained from 3 different sources (chuck, loin and trim). All samples were stored at 2°C for 7, 14 and 21 days.

All raw ground beef samples stored in 0.4% carbon monoxide remained bright red throughout the 21-day storage period. The phenomenon of premature browning (appearance of cooked color at lower …

Hormone Mediated Transport Of Calcium And Phosphate In Polarized Epithelial Cells, Tremaine M. Sterling

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The effects of 1,25(OH)₂D₃, PTH and 25(OH)D₃ on phosphate or calcium uptake were studied in cultured, adherent chick enterocytes over a period of 10 min after hormone addition. Time course studies of cells treated with 130 pM 1,25(OH)₂D₃ showed an increase in ³²P uptake as early as 3 min. Similar studies with 65 pM bPTH(l1-34) resulted in an increase in ⁴⁵Ca uptake only if the cells had been cultured in serum. (OH)D₃, which is not firmly established as an active metabolite of vitamin D, was shown to increase …

The Ability To Taste 6-N-Propylthiouracil (Prop) And Its Relation To A Parent's Emotional Investment In The Infant, Deann Jones

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Research on parenting is increasingly being studied from a biological perspective. An understanding of the biological mechanisms leading to individual differences in maternal behaviors can help direct research toward more focused intervention resulting in closer mother-infant attachment relationships, and therefore, positive child outcomes. This research was a preliminary study that tested mothers' ability to taste a harmless chemical, 6-n-propylthiouracil (PROP), in relation to their responses to a questionnaire about the emotional investment they experience towards their infant. Although research attempting to relate these two variables together has not been carried out before, individual studies show potential links between these two. …

Quantifying Losses Of Understory Forage In Aspen Stands On The Dixie And Fishlake National Forests, Barton R. Stam

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The West has lost up to 60% of its historic aspen stands over the last century, probably as a result of the successional tendency of aspen to be replaced by coniferous species in the absence of periodic fires. One of several major impacts of this change is the loss of understory forage as conifer canopy cover increases. I measured understory biomass in aspen stands ranging from 0% to 81 % absolute conifer cover in the canopy and found that understory production declines exponentially as conifers replace aspen. I also did an economic analysis to determine the value of the forage …

Watershed Management To Control Pollution In The Ayuquila River, Jalisco, Mexico, Luis Manuel Martinez Rivera

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The Ayuquila River watershed is important to western Mexico because of its biodiversity, physiography, fisheries resources, and water production. However, human activities are continuingly affecting natural resources within the basin. Soil erosion, as result of land use change, agriculture in steep land, extensive grazing activities and forest fires; and water diversion and pollution of the Ayuquila River are two relevant issues that have affected the natural resources of this watershed.

This river system plays an important role in wildlife conservation, containing 29 fish species, of which 12 are found inside the BRSM. The River also contains nine species of crustacean, …

Roles Of Religious Orientation And Health Locus Of Control In An Aging Population, Jennifer A. Fallon

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

An intrinsic religious orientation has been linked to improved cardiovascular health. Individuals may be protected by their beliefs against anger/hostility, which have been linked to increased cardiovascular reactivity and disease. Health locus of control differentiates between internals, who take responsibility for health, and externals, who attribute responsibility to chance or powerful others. Internal health locus of control has been linked to healthy behaviors, but its relationship to religious orientation is unclear.

Intrinsically held religious beliefs and internally held expectancies for health may, through the mechanism of reactivity, reduce risk for cardiovascular disease. This study explored relationships among health …

The Use Of Stress Management In Combination With Parent Training: An Intervention Study With Parents Of Preschool Children, Theresa L. Gunderson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Many preschool children exhibit a number of problematic, acting-out behaviors. Parents of preschoolers exhibiting behavior problems often experience a great deal of stress associated with these problem behaviors. Consistently robust improvements have been found in the use of stress management for adult stress, pain, and medical wellbeing. Likewise, studies have shown parent training decreases the severity of child behavior problems. However, only a few studies have examined effects of parent training on both child behavior and parent stress. Some studies have found that parents who complete parent training also report lowered stress levels commensurate with improvement of child behavior. It …

Greenstrip Establishment And Management In The Intermountain West, Brenda Kristine Younkin-Kury

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Greenstrips were established at two sites in Utah to determine if seeded, grazed cool-season, perennial grasses would change fire behavior characteristics in areas currently dominated by Bromus tectorum. Frequency data were collected for both grazed and ungrazed seeded species and resident weed species. Moderate spring grazing did not negatively impact the establishment of seeded species at Camp Williams. Grazing at Promontory Point decreased Agropyron desertorum frequency and increased the frequency of Pascopyrum smithii. Biomass data collected for grazed and ungrazed treatments in both years indicated that moderate spring or winter grazing the first two years of establishment did …

Cougar Exploitation Levels In Utah: Implications For Demographic Structure, Metapopulation Dynamics, And Population Recovery, David C. Stoner

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Presently, eleven western states and two Canadian provinces utilize sport hunting as the primary mechanism for managing cougar (Puma concolor) populations. However, the impacts of sustained harvest on population dynamics and demographic structure arc not well understood. Additionally, the lack of cost-effective enumeration techniques and strongly conflicting societal values complicate effective management of this species. Given these concerns, the primary goals of this study were (I) to determine the effects of sustained harvest on cougar populations, and (2) estimate the level and extent of cougar harvest statewide.

I monitored cougar populations on Monroe Mountain in south-central Utah, and …

Nest Location And Nest Recognition In Two Solitary Bee Species Osmia Lignaria Say And Megachile Rotundata (F.) (Hymenoptera: Megachilidae), Christelle Guédot

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The visual and olfactory cues used in short-range orientation, specifically nest location and nest recognition, were studied in two solitary bee species Osmia lignaria Say and Megachile rotundata (F.) Osmia lignaria, the blue orchard bee, is an important pollinator of orchard crops, such as apples, cherries, and almonds; and M. rotundata, the alfalfa leafcutting bee, is used in commercial pollination of alfalfa. The general objective was to better understand how these two species locate their nests and how improving nest location could benefit crop pollination.

The use of proximal visual landmarks at the nesting site was investigated with …

Natural History, Demography, And Home Range Characteristics Of A Southern California Population Of Phrynosoma Mcallii Inhabiting Atypical Habitat, Kirk Setser

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Phrynosoma mcallii inhabiting a topographically complex, sparsely vegetated, "mudhill" terrain site in southern California in 1999 and 2000 had low mortality rates, and small clutch sizes compared to previous data from this species. Females likely produced a single clutch of eggs in each year. Although this population occurs near a heavily used OHV trail, I did not detect any mortality due to OHV use.

Lizards did not center home ranges on obvious habitat features. Lizards maintained smaller home ranges and exhibited greater range fidelity than did lizards at other sites in other years. Phrynosoma mcallii share many area-use characters with …

Feeding Behavior Of Sheep In Relation To Kinetics Of Sagebrush Monoterpenes: Implications For Landscape Biodiversity, Luthando E. Dziba

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The sagebrush steppe is one of the most extensive vegetation types in the western US and an important habitat for wild and domestic herbivores. When sagebrush dominates, however, forage and habitat quality decline. Although sagebrush is nutritious, its forage value is reduced by terpenes. A better understanding of how terpenes limit intake is vital for increasing consumption of sagebrush and for enhancing and maintaining biodiversity in the sagebrush-steppe.

To better understand how terpenes in sagebrush limit intake, we studied feeding behavior of sheep in the field, influence of sagebrush monoterpenes on regulation of intake in pens, and the feeding behavior …

Host Shifts In Phytophagous Insects: A Mathematical Modeling Perspective, Meenakshi Venkataraman

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

I explored changes in predator-prey system stability with the addition of spatial heterogeneity in prey density dependent mortality. The results indicated that this addition led to greater stability for all prey spatial distributions if prey was aggregated or loosely aggregated. These results indicated prey spatial distribution was critical to population stability. I next explored whether predator emigration under the above conditions would lead to a host shift. I used Chesson and Murdoch's templates of host density independent (HDI) aggregation and host density dependent (HDD) aggregation in predators as the basis for my metapopulation models. I varied prey density dependent mortality …

Changes In Child Symptomatology Associated With Animal-Assisted Therapy, Catherine C. Woolley

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study examined the changes in symptoms of anxiety, depression, and social dysfunction associated with a history of child trauma after adding animal-assisted therapy (AAT) to conventional psychotherapy for adolescents living in a residential treatment facility in northern California. Using a quasiexperimental design, participants were followed over a period of nine weeks, with both groups completing the State-Trait Anxiety Inventory, the Beck Depression Inventory, an abbreviated version of the Beck Depression Inventory, and the Youth Self-Report, and residential staff completing the Youth Outcome Questionnaire at three time points. In addition, the treatment group completed state anxiety and depression assessments before …

Heresy And Orthodoxy: Challenging Established Paradigms And Disciplines, Marion Hersch, Gloria Moss

Journal of International Women's Studies

A brief survey of the literature on interdisciplinary work and a discussion of issues relating to orthodoxy and heresy are presented to introduce a questionnaire on current interdisciplinary practice and the effects of engaging in research of this kind. Preliminary results of the survey are presented and it is suggested that women may have a greater tendency than men to engage in interdisciplinary research. They may also encounter more obstacles in their research than men. A number of hypotheses, including the relationship of interdisciplinary work and heresy, are proposed and a plan of further work to investigate them put forward.

Women’S Constructions Of Women: On Entering The Front Door, Myria Vassiliadou

Journal of International Women's Studies

Despite the vast volume of scholarly work on Mediterranean and the Near East the region, issues of marginalisation, discrimination, racism, and ethnic-gender groups as well as the implications of these within the context of various wider forces and structures are only lately receiving any attention at all and this paper is part of an effort to explore and expose them. The aim of this paper is to explore this otherwise forgotten area through the example of Cypriot women and their interpretations of internal ‘Others’ in Cyprus. It is thus an attempt to analyze the discourses and images adopted by women …

Ain’T I A Woman? Revisiting Intersectionality, Avtar Brah, Ann Phoenix

Journal of International Women's Studies

In the context of the second Gulf war and US and the British occupation of Iraq, many ‘old’ debates about the category ‘woman’ have assumed a new critical urgency. This paper revisits debates on intersectionality in order to show that they can shed new light on how we might approach some current issues. It first discusses the 19th century contestations among feminists involved in anti-slavery struggles and campaigns for women’s suffrage. The second part of the paper uses autobiography and empirical studies to demonstrate that social class (and its intersections with gender and ‘race’ or sexuality) are simultaneously subjective, structural …

Gender, Context, And Physics Assessment, Laura Mccullough

Journal of International Women's Studies

A persistent gender gap exists on one of the most commonly-used physics conceptual tests, the Force Concept Inventory. The test includes many stereotypically male contexts such as hockey, rockets, and cannonballs. A revised version of the test was created using stereotypically female contexts and both versions were randomly administered to 300 college students. While the total correct score did not change for men and women, significant results were discovered when test questions were examined individually. Results suggest that context can affect performance on a physics assessment for both men and women. One implication for instructors is that they should be …

Re-Visioning Science Education, Ingrid Bartsch

Journal of International Women's Studies

Science education is crucial for shaping the culture of science and its practitioners. Boundaries currently limit ties between natural and social science education structures, exposing the public to a one-dimensional science and its possible ramifications. Believing this to be a “crisis,” I explore a variety of approaches to re-visioning science education and the ensuing forms of resistance that these face. In addition, a more personal accounting of my experience with trying to integrate social and cultural issues into the education of scientists allows me to explore the forms of resistance I faced; bridge the gap between theory and practice; and …

Judith Merril And Rachel Carson: Reflections On Their “Potent Fictions” Of Science, Dianne Newell

Journal of International Women's Studies

Donna Haraway has argued that women’s engagement with the masculine domain of science and modern culture usually occurs at the peripheries and from the depths, not from the platform of the powerful. This paper considers the popular culture fields of science fiction and nature writing, exploring the contributions of two American women writers who both operated at the peripheries of science and landed on the ‘platform of the powerful’: Judith Merril and Rachel Carson. Their domestic Cold War envisioning and conflation of literature and science and their insights into the inherently political nature of science anticipated the foundational feminist discussions …

Poems, Catherine Daly

Journal of International Women's Studies

No abstract provided.

First Hand Account Of Selected Legal Issues From The Recovery And Investigation Of The Space Shuttle Columbia, Donna M. Shafer, Amy Voigt Leconey

Journal of Space Law

No abstract provided.

Habitat Preferences Of Four Species Of Lizards Found At The Las Vegas Springs Preserve, Scott Garncarz

UNLV Theses, Dissertations, Professional Papers, and Capstones

Developing an understanding of the habitat usage of reptiles is important when trying to develop a management or restoration plan that is compatible with what is known of the reptile species that are being investigated. There are many lizard species found in the Mojave Desert, but there are only four known to inhabit the Las Vegas Springs Preserve (LVSP) in Las Vegas, Nevada. In the LVSP, sites are going to be restored with native Mojave Desert vegetation. Since there are many habitat types in the Mojave Desert, we must determine which types would be best suited for the four species …

Usage Of Instructional Multimedia To Enhance Interactivity Through Web-Based Learning In P--12 Settings, Sharon L. Teabo

Graduate Theses, Dissertations, and Problem Reports (ETD)

The purpose of this study was to analyze multiple media as instructional technologies used to enhance interactivity in a web-based environment and to illustrate the potential for improved learning with interactive multimedia. This study identified instructional media that teachers use, the level of engagement with the media, and determined that there was a correlation between the types and use of instructional media and cognitive level of learning.;Research shows that web-based instruction has the ability to engage learners in real-world tasks. This type of authentic learning has the potential to promote higher order thinking provided students are properly skilled in the …