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Resistance To Drought And Salt Stress After Regeneration And Micropropagation., F Hadi, Mp Fuller

School of Biological and Marine Sciences

Investigation was made to confirm the stability of drought and salt stress tolerance in cauliflower (Brassica oleracea var.botrytis) mutants after regeneration and micropropagation. The N-nitroso-N-ethyleurea (NEU) and N-nitroso-N-methylurea (NMU) induced mutants of cauliflower were created and screened for drought and salt stress tolerance. The highly tolerant mutants were selected, regenerated by tissue culture techniques, screened again for drought and salt tolerance under in-vitro and in-vivo conditions, correlated the response of in vitro and in-vivo plants within a clone. Free proline levels in clones were correlated with stress tolerance. Results confirmed the persistence of mutations in clones with enhanced resistance levels …

A Field Experiment Demonstrating Plant Life-History Evolution And Its Eco-Evolutionary Feedback To Seed Predator Populations, Anurag A. Agrawal, Marc T. J. Johnson, Amy P. Hastings, John L. Maron

Biological Sciences Faculty Publications

The extent to which evolutionary change occurs in a predictable manner under field conditions and how evolutionary changes feed back to influence ecological dynamics are fundamental, yet unresolved, questions. To address these issues, we established eight replicate populations of native common evening primrose (Oenothera biennis). Each population was planted with 18 genotypes in identical frequency. By tracking genotype frequencies with microsatellite DNA markers over the subsequent three years (up to three generations, approximate to 5,000 genotyped plants), we show rapid and consistent evolution of two heritable plant life-history traits (shorter life span and later flowering time). This rapid evolution was …

Sensitivity Of Inferred Climate Model Skill To Evaluation Decisions: A Case Study Using Cmip5 Evapotranspiration, Christopher R. Schwalm, Deborah N. Huntinzger, Anna M. Michalak, Joshua B. Fisher, John S. Kimball, Brigitte Mueller, Ke Zhang, Yongqiang Zhang

Numerical Terradynamic Simulation Group Publications

Confrontation of climate models with observationally-based reference datasets is widespread and integral to model development. These comparisons yield skill metrics quantifying the mismatch between simulated and reference values and also involve analyst choices, or meta-parameters, in structuring the analysis. Here, we systematically vary five such meta-parameters (reference dataset, spatial resolution, regridding approach, land mask, and time period) in evaluating evapotranspiration (ET) from eight CMIP5 models in a factorial design that yields 68 700 intercomparisons. The results show that while model–data comparisons can provide some feedback on overall model performance, model ranks are ambiguous and inferred model skill and rank are …

The Extent Of Wetland Vegetation And Wetness Change At Eufaula National Wildlife Refuge From 1984-2012 Examined Using Landsat Thematic Mapper And Enhanced Thematic Mapper Plus Imagery, Jeremy M. Henning

Master's Theses or Doctor of Nursing Practice

Wetlands provide functions such as reducing flooding of surrounding areas and acting as a rest stop for migrating birds. Eufaula National Wildlife Refuge in Alabama has a natural wetland and six artificial wetlands that are differentiated by how they are drained. Remote sensing derived normalized difference vegetation index and normalized difference wetness indexes were used to obtain information about vegetation and wetness at the wetlands from 1984-2011. A correlation analysis was performed to assess the degree of association between vegetation and wetness as a function of management practices. An ANOVA and agglomerative hierarchical clustering were performed to assess the degree …

Stable Isotope Analysis Of Two Mephitidae Species Reflects Population Trends And Landscape Structure, Amanda E. Cheeseman

Master's Theses or Doctor of Nursing Practice

The eastern spotted skunk (Spilogale putorius) is a small omnivorous Carnivora similar in much of its natural history to the commonly found striped skunk (Mephitis mephitis). Spilogale putorius has experienced drastic population declines over a large portion of its geographic range. Many hypotheses for the decline of S. putorius have been proposed. δ13C and δ15N isotope analysis provides a unique opportunity to examine diet over an expanded time span. Thus was used on hair sampled from natural history collections, teaching collections, and road kills to examine dietary change for both S. putorius and M. mephitis from 1852 to 2012. Because …

Effects Of Long-Term Exposure To Kanamycin And/Or Ampicillin On Resistance Genes On An E. Coli Plasmid, Justin W.R. Kerby Ii

Master's Theses or Doctor of Nursing Practice

Multi-drug-resistant bacteria are a major cause of hospital-acquired infections and antibiotic resistance in these organisms is often plasmid mediated, which has become a growing concern. Plasmids conferring resistance to multiple antibiotics are increasingly becoming a common source of antibiotic resistance. The behavior of these plasmids under and in the absence of selective pressure is not yet fully understood. Therefore, to determine the behavior of a multiple-resistance plasmid under selective pressure pCR 2.1-TOPO, a commercial plasmid, was inserted into an Escherichia coli host and grown in a continuous culture under four conditions: broth with 1) kanamycin alone, 2) ampicillin alone, 3) …

Antimicrobial Producing Bacteria Isolated From Petroleum-Laced Hypersaline Soil, Joanna L. Fay

Master's Theses or Doctor of Nursing Practice

Given the alternative functions of “antibiotics” as communication molecules or participants in metabolism, it seems probable that production might be influenced by factors such as nutrient availability, interactions with neighboring microbes, and/or colony or community structure and maturity. With this in mind, the present study aimed to broaden the scope of the search for novel antibiotics by experimenting with the following parameters: source of bacterial isolation, growth and assay media, and culturing techniques. Bacteria for this study were isolated from two categories of soil (petroleum-contaminated or uncontaminated) to compare diversity and antimicrobial activity. Compared to the uncontaminated soil, isolates of …

The Impact Of Maturity And Parenting Style In Delinquent Behaviors, Nichole Lind

Master's Theses or Doctor of Nursing Practice

Most of the previous research about juvenile delinquency has focused on why some adolescents become delinquent. Elliott and Voss (1974) theorized that delinquent behavior occurs due to the aspiration opportunity disjunction, or goals that are beyond one’s means. Moffitt (1993) shifted the focus of research as to why most adolescents quit their delinquent behavior and others persist towards a lifetime of criminal activities. Mounts (2002) found that parents who had higher levels of parenting management practices had adolescents with lower levels of drug use and drug using friends. Moffitt (1993) proposed that it is a perceptual shift or an exit …

Influence Of Wind Turbines On Mammalian Occupancy Patterns, Brian P. Tanis

Master's Theses or Doctor of Nursing Practice

Wind energy is among the most rapidly growing energy industries in the United States, with support for development coming from both state and federal governments. While the industry depicts an environmentally friendly image, the addition of infrastructure associated with wind farms alters landscapes in novel ways. Numerous studies have documented impacts wind turbines have on bird and bat mortality; however, far less attention has been directed towards responses of non-volant, terrestrial organisms. Mammalian mesocarnivores are model organisms to assess the alteration of communities surrounding wind turbines as they respond to addition of turbines and human activity, addition and improvement of …

Interaction Of Bacillus Anthracis Exosporium Protein Bcla With Complement Factor H And Spore Persistence In The Lung, Sarah A. Jenkins

Dissertations and Theses (Open Access)

Anthrax outbreaks in the United States and Europe and its potential use as a bioweapon have made Bacillus anthracis an interest of study. Anthrax infections are caused by the entry of B. anthracis spores into the host via the respiratory system, the gastrointestinal tract, cuts or wounds in the skin, and injection. Among these four forms, inhalational anthrax has the highest lethality rate and persistence of spores in the lungs of animals following pulmonary exposure has been noted for decades. However, details or mechanisms of spore persistence were not known. In this study, we investigated spore persistence in a mouse …

Role Of Mir-19a Released By Inflammatory Breast Cancer Cells In The Regulation Of Dendritic Cell Functions: In Vitro Model Of Crosstalk In The Tumor Microenvironment Of Inflammatory Breast Cancer, Simone Anfossi

Dissertations and Theses (Open Access)

Inflammatory breast cancer (IBC) is a rare but very aggressive form of locally advanced breast cancer (1-6% of total breast cancer patients in United States), with a 5-year overall survival rate of only 40.5%, compared with 85% of the non-IBC patients. So far, a unique molecular signature for IBC able to explain the dramatic differences in the tumor biology between IBC and non-IBC has not been identified. As immune cells in the tumor microenvironment plays an important role in regulating tumor progression, we hypothesized that tumor-associated dendritic cells (TADC) may be responsible for regulating the development of the aggressive characteristics …

Numerical Analysis Of Non-Fickian Diffusion With A General Source, Ganesh Tiwari

Senior Honors Theses

The inadequacy of Fick’s law to incorporate causality can be overcome by replacing it with the Green–Naghdi type II (GNII) flux relation. Combining the GNII assumption and conservation of mass leads to [see document for equation] where r (x, t) is the density function, S(p) is a source term and c_¥ is a positive constant which carries (SI) units of m/sec. A general source term given by [see document for equation] is proposed. Here, the constants y and p_s are the rate coefficient and saturation density respectively. The travelling wave solutions and numerical analysis …

Synthesis Of Dibenzofurans Via A Palladium Catalyzed Oxidative Ring Closure Reaction, Sadia Akram

Senior Honors Theses

The cannabinoid partial agonist BAY 59-3704 has been identified as an attractive target to explore structure-activity relationships at cannabinoid receptors for the development of a therapeutic agent for psychostimulant addiction. This thesis will describe the studies associated with the optimization of a palladium-catalyzed oxidative ring closure reaction for the synthesisof dibenzofuran analogues from substituted diaryl ethers. These dibenzofurans are viewed as rigid analogues of BAY 59-3704 and will provide useful information about molecular interactions at cannabinoid receptors. The scope and limitations of the palladium-catalyzed oxidative ring closure reaction as it relates to the synthesis of the target dibenzofuran analogues will …

Evaluating The Effects Of Capture And Handling Time On Plasma Corticosterone And Heterophil/Lymphocyte Ratios In The Tufted Titmouse (Baeolophus Bicolor), Michael A. Carlo

Departmental Honors & Graduate Capstone Projects

Birds have a protective physiological response to stress, which consists of three main components: the hormonal response, the immune response and the intracellular response. This study evaluates the effects of acute distress due to capture and handling on plasma corticosterone (CORT) and heterophil/lymphocyte ratios (H/L) , physiological indicators of the hormonal and immune components of the stress response in the Tufted Titmouse (Baeolophus bicolor), as well as the relationship between the two biomarkers. These stress indicators are currently used in both basic and applied avian research. But their relationship with each other and their responses to specific stressors such as …

Public Land And Its Management: Why The Research Is Not Enough, Corinne Calhoun

Pomona Senior Theses

Ecological research, both basic and applied, can inform management decisions on public land in a number of ways. Most importantly, it can illuminate any negative effects of a given land use practice as well as the causes behind that effect. This type of information can be important to a management agency, such as the BLM, with a multi-use mission as these studies indicate under what management regimes a land use is in contradiction with other goals, such as conservation or restoration.

The current body of research, however, is flawed. In order to make fully informed decisions, land managers are in …

Conserving Fish And Forests: Community Involvement And Its Limits In Resource Management On The Island Of Hawai'i, Amber W. Datta

Pomona Senior Theses

In this thesis I examine the limits of community involvement in accomplishing the conservation goals of biodiversity and ecosystem function in resource management by analyzing the multiple interest groups that compose community. Two case studies are presented to accomplish this goal. The first case study is the West Hawaii Fisheries Management Area, where a group of community stakeholders provide management recommendations that are then implemented by the state. The second case study is the Ka’u forest reserve, where community involvement is invited into the management decision-making process but is also limited in its ultimate political power by the state. Through …

Agency Decision-Making For Climate Change: Cost-Benefit Analysis, The Precautionary Principle, And The Bounds Of Rationality, Laura Carr

Pomona Senior Theses

Climate change tests the limits of human understanding of complexity and uncertainty. It challenges assumptions about our presumed power of control over this planet. This paper examines the theory of how governmental executive branch agencies make regulation decisions about climate change using the decision-making methodologies of cost-benefit analysis and the precautionary principle, and as influenced by perceptions of the bounds of human rationality and ability to deal with risk and uncertainty.

A New Commons: Considering Community-Based Co-Management For Sustainable Fisheries, Charlotte L. Dohrn

Pomona Senior Theses

Commercial fisheries on the West Coast are traditionally managed under large-scale management and conservation plans implemented by state and federal agencies. This scale of management can present obstacles for fishing communities. This thesis examines emerging cases of attempts to define and implement sustainable management of commercial fisheries under a community-based co-management model. In Port Orford, Sitka, San Diego and Santa Barbara, preliminary community-based co-management models are enabling fishing communities to pursue social sustainability through preserving access, participating in local science, and direct marketing for fish products. These communities are actively reshaping traditional models of conceptualizing and managing common-pool resources like …

Greening The Streets: A Comparison Of Sustainable Stormwater Management In Portland, Oregon And Los Angeles, California, Na'ama Schweitzer

Pomona Senior Theses

Stormwater runoff is one of the main sources of pollution for urban waterways. Stormwater has traditionally been managed through concrete-based storm drainage systems, but the past twenty years have introduced an alternative in the form of green infrastructure. Green infrastructure for stormwater management involves the use of low impact development (LID), often vegetated facilities to mimic natural hydrologic systems that capture and allow infiltration of rainwater where it falls and from impervious surfaces upstream, before entering the drainage system. Portland, Oregon and Los Angeles, California have adopted green infrastructure into their stormwater management plans. For this project, bioswales, a form …

Cooking Up A Course: Food Education At Pomona College, Christina A. Cyr

Pomona Senior Theses

Cooking skills are important but declining, with significant health, social, cultural, political, economic, and environmental implications. Food and cooking education can begin to address some of the negative effects of the cooking skills decline. This thesis makes the case for cooking classes in the education system, especially in higher education. The paper begins with a history of cooking education and skills, outlines the implications of the decline in skills, and discusses the potential for cooking education in higher education. The second part consists of a course syllabus, designed for Pomona College. The third section includes a discussion of the implementation …

Healthcare Delivery System Improvements: A Way Forward To Improve Health In Developing Countries And Pakistan, Waris Qidwai

Department of Family Medicine

No abstract provided.

Authentic, Transformational Leadership: A Phenomenological Study Of The Experiences Of Black/White Biracial Leaders, Carmen R. Zafft

Department of Agricultural Leadership, Education, and Communication: Dissertations, Theses, and Student Research

This phenomenological study described the racial identity and leadership experiences of eight community, education, and business Black/White biracial leaders. Four central themes emerged relating to the participants’ racial identity choices: (a) family discourse, (b) social networks, (c) appearance, and (d) identity work. Three central themes emerged relating to the participants’ leadership experiences: (a) cultural agility: “Blessed to be flexible”, (b) perceived representation: “I look like them”, and (c) transformational leadership: “I lead so others can grow.” Because the participants were conscious of their identity development experience, all demonstrated a strong sense of self which influenced how they experienced leadership. As …

Environmentally Friendly Sizing Agent From Corn Distillers Dried Grains, Yue Zhang

College of Education and Human Sciences: Dissertations, Theses, and Student Research

Distillers dried grains (DDGS), the coproducts of corn ethanol production, were used as a textile sizing agent on cotton, polyester and polyester/cotton blends in an effort to find inexpensive and biodegradable alternatives to sizing agents such as poly(vinyl alcohol) that are currently used. Although DDGS is an inexpensive, biodegradable and abundant co-product, it has limited industrial applications. DDGS is a mixture of carbohydrates, proteins and oil which are used as sizing agents or as size additives. The effects of DDGS extraction conditions on sizing evaluation parameters such as fiber adhesion, film properties, viscosity and fabric abrasion were studied in comparison …

Stress, Coping, And Depression In Adolescents： A Longitudinal Analysis Of Data From National Longitudinal Study Of Adolescent Health, Xiaoyun Zhang

College of Education and Human Sciences: Dissertations, Theses, and Student Research

The study examined the relationships among stress, coping and depression using the public-use data from the first three waves of the National Longitudinal Study of Adolescent Health (Harris & Udry, 1994-2008). The total sample of 3844 participants aged from 11 to 27 was included in the analysis. Latent growth curve modeling was used to identify the developmental trajectories of depressive symptoms and stressful life events from age 12 to age 24, respectively; Latent growth curve modeling with two-construct parallel processes was used to examine the associations between stressful life events and depressive symptoms over time. Path analysis was used to …

Agricultural Development In The Northern Savannah Of Ghana, Tara N. Wood

Doctor of Plant Health Program: Dissertations and Student Research

Since declaring independence in 1957, the Republic of Ghana has become a stable constitutional democracy. Ghana’s economy has grown substantially over the past decade, yet remains primarily agrarian, accounting for 50% of the total employment and 25% of the country’s Gross Domestic Product. Smallholder rain-fed farming using rudimentary technologies dominates the agricultural sector accounting for 80% of total agricultural production. Approximately 90% of smallholder farms are less than two hectares in size, and produce a diversity of crops. The major crops cultivated in Ghana include numerous cereal, root and tuber, leguminous, fruit, vegetable and industrial crops. Maize is the most …

A Widow’S Will: Examining The Challenges Of Widowhood In Early Modern England And America, Alyson D. Alvarez

Department of History: Dissertations, Theses, and Student Research

While English women in the sixteenth and seventeenth centuries had different social and economic circumstances, many were able to gain autonomy and power in their widowhood. Widows who were able to gain autonomy faced a number of challenges as they attempted to live and function in a patriarchal society. One of the factors that affected the challenges of a widow was her social standing. In this thesis I argue that widows of all means encountered a challenges from the patriarchal society in which they resided. The number and severity of difficulties that a widow confronted depended on several factors. I …

Adapting To A Changing World: An Environmental History Of The Eastern Shoshone, 1000–1868, Adam R. Hodge

Department of History: Dissertations, Theses, and Student Research

Using the Eastern Shoshone Tribe as a case study, this dissertation argues that the physical environment must be considered integral to processes of ethnogenesis. It traces the environmental history of the people who became known as the Eastern Shoshone over the course of several centuries, exploring how those Natives migrated throughout and adapted to a significant portion of the North American West – the Great Basin, Rocky Mountains, Columbia Plateau, and Great Plains – prior to the reservation era. In examining that history, this project treats Shoshones, other Natives, and Euro-Americans not as people who simply used the environment, but …

Amphibian Occupancy And Functional Connectivity Of Restored Wetlands In The Missouri River Floodplain, Michelle L. Hellman

School of Natural Resources: Dissertations, Theses, and Student Research

Wetland decline may threaten many taxa including shorebirds, amphibians, and fish. As agencies increase restoration of wetland habitat, monitoring is crucial to inform the process. Permeable skin sensitive to water quality and biphasic life histories requiring both terrestrial and aquatic habitat make amphibians good indicators of wetland health. I modeled amphibian occupancy in restored Missouri River bends to determine habitat characteristics associated with the presence of amphibians.

Occupancy modeling acknowledges imperfect detection and allows the inclusion of detection covariates. To assess detection I examined two methods currently used to assess anuran occupancy in wetlands, aural anuran surveys and tadpole dip-netting. …

Social Affiliation: A Model Of Anxious Avoidance In Women, Milena Stoyanova

Department of Psychology: Dissertations, Theses, and Student Research

There is substantial evidence demonstrating that women experience greater anxiety and fear compared to men. However, our understanding of specific factors accounting for women’s greater vulnerability remains rather limited. Taylor and colleagues (2000) proposed that women may have a different biobehavioral response to stress, which has evolved to protect and nurture offspring. The tend-and-befriend model provides new opportunities to explore underlying processes that may contribute to women’s greater anxiety and fear.

The present study examined women’s stress response combined with the absence of positive social contact as it relates to the presentation of fear and anxiety. One hundred and seven …

Regulation Of Secondary Metabolism In Lysobacter Enzymogenes: Studies Of Intercellular And Intracellular Signaling, Stephen J. Wright

Department of Chemistry: Dissertations, Theses, and Student Research

The organisms of the genus Lysobacter have been recognized as prolific producers of bioactive secondary metabolites, making them potentially valuable as biocontrol agents and as sources of compounds for drug leads. This study was aimed at understanding the regulatory mechanisms that underlie the production of secondary metabolites in our study organism, Lysobacter enzymogenes. Since secondary metabolism is energetically costly, we sought not only to elucidate the biosynthetic chemistry by which the bioactive molecules were constructed, but also the regulation of the biosynthetic machinery. The molecular mechanisms by which L. enzymogenes responds to environmental conditions and transduces signals leading to …