Degree Level

Podcasting in an Eighth-Grade American History Class (open access)

Podcasting in an Eighth-Grade American History Class

The purpose of this study was to see how students used podcasts in an eighth-grade American history unit and the value they placed on them as an educational tool. The 6-week study was conducted in a suburban middle school in a district that is part of a large metropolitan area in Texas. Participants included 29 students and 2 eighth-grade teachers. The research questions were the following: (1) How do students use podcasts in an eighth-grade American history class? (2) How do students perceive the impact of the podcasts on their overall learning of the subject material? and (3) Do the podcasts motivate the students to study? Quantitative data were collected through a Likert-scaled student survey and logs kept by students. Qualitative data were collected through an open-ended portion of the student survey, student focus group discussion, and a faculty interview. The treatment tools were audio podcasts in the form of vocabulary-quiz reviews, historical vignettes, lectures, and a unit test review—all on the topic of the American Revolution. The data indicated that the students primarily used their computers at home to listen to the podcasts as they prepared for quizzes and/or the unit test. The students believed that the podcasts had …
Date: December 2011
Creator: Davis, Patrick D.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Catastrophe in Permanence: Benjamin's Natural History of Environmental Crisis (open access)

Catastrophe in Permanence: Benjamin's Natural History of Environmental Crisis

Walter Benjamin warned in 1940 of a certain inconspicuous threat to political thinking, not least of all to materialism, that takes progress as an historical norm. Implicit in this conception is what he describes as an empty continuum of time along which the prevailing tradition chronicles its own mythic development and drains everyday life of genuine historical experience. The myth of progressive history advances insidiously today in consumeristic and technocratic attempts at reconciling cultural imagery with organic nature. In this dissertation, I pursue the contradictions of such images as they crystallize around the natural history of twenty-first century commodity society, where promises of ecological remediation, sustainable urban development, and climate change mitigation have yet to introduce a true crisis of historical experience to the ongoing environmental crisis of capitalism. A more radical way of seeing the cultural representation of nature would, I argue, penetrate its mythic determination by market forces and bear witness to the natural-historical ruins and traces that constitute, in Benjamin's terms, a single "catastrophe" where others perceive historical continuity. I argue that Benjamin's critique of progress is instructive to interpreting those utopian dreams, ablaze in consumer life and technological fantasy, that recent decades of growing environmental concern …
Date: May 2017
Creator: Bower, Matthew S.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
A History of Overcoming: Nietzsche on the Moral Antecedents and Successors of Modern Liberalism (open access)

A History of Overcoming: Nietzsche on the Moral Antecedents and Successors of Modern Liberalism

This work aims to understand human moral psychology under modern liberalism by analyzing the mature work of philosopher Friedrich Nietzsche. I seek to understand and evaluate Nietzsche's claim that liberalism, rather than being an overturning of slave morality, is an extension of the slave morality present in both Judaism and Christianity. To ground Nietzsche's critique of liberalism theoretically, I begin by analyzing his "master" and "slave" concepts. With these concepts clarified, I then apply them to Nietzsche's history by following his path from Judaism to liberalism and beyond--to his "last man" and Übermensch. I find that Nietzsche views history as a series of overcomings wherein a given mode of power maintenance runs counter to the means by which power was initially attained. Liberalism, as the precursor and herald of the "last man," threatens the end of overcoming and therefore compromises the future of human valuation and meaning.
Date: December 2016
Creator: Gill, Rodney W.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Sexual Orientation and the Advanced Placement Art History Survey (open access)

Sexual Orientation and the Advanced Placement Art History Survey

This two-part study included a content analysis of an AP art history text and a survey together with interviews with AP art history teachers that embraced both quantitative and qualitative research methodologies. The first phase of the study examined one of the more popular art history survey texts in the AP art history program, Gardner’s Art through the Ages, in terms of how inclusive it is in addressing issues of sexual orientation and, particularly, same-sex perspectives. In addition, the text was examined for evidence of sexual orientation ignored – particularly same-sex perspectives ignored and for heteronormative hegemonies. The second phase investigated the understandings and opinions of AP art history teachers toward the inclusion of sexual orientation and same-sex perspectives in their curriculums and classrooms. Recent recognition of gay, lesbian, and same-sex perspectives in the study of art history has challenged art educators and art historians to begin to consider opening up their curriculums and writings to include these perspectives. These ignored perspectives produce important understandings that enrich and deepen the discourse of art history. The inclusion of gay and lesbian content and same-sex perspectives to the study of AP art history, not only effectively serves the needs of AP art …
Date: December 2014
Creator: Bond, Richard P.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Between Comancheros and Comanchería: a History of Fort Bascom, New Mexico (open access)

Between Comancheros and Comanchería: a History of Fort Bascom, New Mexico

In 1863, Fort Bascom was built along the Canadian River in the Eroded Plains of Territorial New Mexico. Its unique location placed it between the Comanches of Texas and the Comancheros of the Sangre de Cristo Mountains. This post was situated within Comanchería during the height of the United States Army's war against the Southern Plains Indians, yet it has garnered little attention. This study broadens the scholarly understanding of how the United States Army gained control of the Southwest by examining the role Fort Bascom played in this mission. This includes an exploration of the Canadian River Valley environment, an examination of the economic relationship that existed between the Southern Plains Indians and the mountain people of New Mexico, and an account of the daily life of soldiers posted to Fort Bascom. This dissertation thus provides an environmental and cultural history of the Canadian River Valley in New Mexico, a social history of the men stationed at Fort Bascom, and proof that the post played a key role in the Army's efforts to gain control of the Southern Plains Indians. This study argues that Fort Bascom should be recognized as Texas' northern-most frontier fort. Its men were closer to …
Date: August 2012
Creator: Blackshear, James Bailey
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Contextualizing History Curriculum: A Qualitative Case Study in Balochistan Pakistan (open access)

Contextualizing History Curriculum: A Qualitative Case Study in Balochistan Pakistan

The purpose of the study was to evaluate Pakistan's national history curriculum in the post 18th constitutional amendment scenario. The amendment bequeathed the responsibility of education, including curriculum development, to the provinces. This study sought input from educators on ways the national curriculum currently addresses local needs and requirements as well as considerations for any potential changes or improvements. Traditionally, history curriculum has been used mainly for social identity formation and ideological indoctrination; current scholarship on history education has now also included national identity formation. Additionally, scholarship has begun to analyze possible purposes behind social identity formation, whether used negatively or positively. This study, which took place in Balochistan, Pakistan, used a qualitative case study approach. A provincial level conference was convened as a context and data source that involved 28 educators including teachers, teacher educators, curriculum experts, and policy actors as participants in the study. The texts of five representative educators engaged in the conference dialogue was selected for analysis. Discourse analysis was the methodology used to arrive at findings of the study. The study yielded several interesting findings that give insight about the national history curriculum of Pakistan and future curriculum practices of the Balochistan province. According to …
Date: August 2016
Creator: Khan, Gulab
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Bass Reeves: a History • a Novel • a Crusade, Volume 1: the Rise (open access)

Bass Reeves: a History • a Novel • a Crusade, Volume 1: the Rise

This literary/historical novel details the life of African-American Deputy US Marshal Bass Reeves between the years 1838-1862 and 1883-1884. One plotline depicts Reeves’s youth as a slave, including his service as a body servant to a Confederate cavalry officer during the Civil War. Another plotline depicts him years later, after Emancipation, at the height of his deputy career, when he has become the most feared, most successful lawman in Indian Territory, the largest federal jurisdiction in American history and the most dangerous part of the Old West. A preface explores the uniqueness of this project’s historical relevance and literary positioning as a neo-slave narrative, and addresses a few liberties that I take with the historical record.
Date: August 2015
Creator: Thompson, Sidney, 1965-
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Southern Promise and Necessity:  Texas, Regional Identity, and the National Woman Suffrage Movement, 1868-1920 (open access)

Southern Promise and Necessity: Texas, Regional Identity, and the National Woman Suffrage Movement, 1868-1920

This study offers a concentrated view of how a national movement developed networks from the grassroots up and how regional identity can influence national campaign strategies by examining the roles Texas and Texans played in the woman suffrage movement in the United States. The interest that multiple generations of national woman suffrage leaders showed in Texas, from Reconstruction through the ratification of the Nineteenth Amendment, provides new insights into the reciprocal nature of national movements. Increasingly, from 1868 to 1920, a bilateral flow of resources existed between national women's rights leaders and woman suffrage activists in Texas. Additionally, this study nationalizes the woman suffrage movement earlier than previously thought. Cross-regional woman suffrage activity has been marginalized by the belief that campaigning in the South did not exist or had not connected with the national associations until the 1890s. This closer examination provides a different view. Early woman's rights leaders aimed at a nationwide movement from the beginning. This national goal included the South, and woman suffrage interest soon spread to the region. One of the major factors in this relationship was that the primarily northeastern-based national leadership desperately needed southern support to aid in their larger goals. Texas' ability to …
Date: August 2010
Creator: Brannon-Wranosky, Jessica S.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Jacques-Antoine-Hippolyte, Comte De Guibert: Father of the Grande Armée (open access)

Jacques-Antoine-Hippolyte, Comte De Guibert: Father of the Grande Armée

Jacques-Antoine-Hippolyte, comte de Guibert (1743-1790) dedicated his life and career to creating a new doctrine for the French army. Little about this doctrine was revolutionary. Indeed, Guibert openly decried the anarchy of popular participation in government and looked askance at the early days of the Revolution. Rather, Guibert’s doctrine marked the culmination of an evolutionary process that commenced decades before his time and reached fruition in the Réglement of 1791, which remained in force until the 1830s. Not content with military reform, Guibert demanded a political and social constitution to match. His reforms required these changes, demanding a disciplined, service-oriented society and a functional, rational government to assist his reformed military. He delved deeply, like no other contemporary writer, into the linkages between society, politics, and the military throughout his career and his writings. Guibert exerted an overwhelming influence on military thought across Europe for the next fifty years. His military theories provided the foundation for military reform during the twilight of the Old Regime. The Revolution, which adopted most of Guibert’s doctrine in 1791, continued his work. A new army and way of war based on Guibert’s reforms emerged to defeat France’s major enemies. In Napoleon’s hands, Guibert’s army …
Date: August 2014
Creator: Abel, Jonathan, 1985-
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Nathanael Greene and the Myth of the Valiant Few (open access)

Nathanael Greene and the Myth of the Valiant Few

Nathan Greene is the Revolutionary Warfare general most associated with unconventional warfare. The historiography of the southern campaign of the revolution uniformly agrees he was a guerrilla leader. Best evidence shows, however, that Nathanael Greene was completely conventional -- that his strategy, operations, tactics, and logistics all strongly resembled that of Washington in the northern theater and of the British commanders against whom he fought in the south. By establishing that Greene was within the mainstream of eighteenth-century military science this dissertation also challenges the prevailing historiography of the American Revolution in general, especially its military aspects. The historiography overwhelmingly argues the myth of the valiant few -- the notion that a minority of colonists persuaded an apathetic majority to follow them in overthrowing the royal government, eking out an improbable victory. Broad and thorough research indicates the Patriot faction in the American Revolution was a clear majority not only throughout the colonies but in each individual colony. Far from the miraculous victory current historiography postulates, American independence was based on the most prosaic of principles -- manpower advantage.
Date: December 2017
Creator: Smith, David R.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Exposing the Spectacular Body: The Wheel, Hanging, Impaling, Placarding, and Crucifixion in the Ancient World (open access)

Exposing the Spectacular Body: The Wheel, Hanging, Impaling, Placarding, and Crucifixion in the Ancient World

This dissertation brings the Ancient Near Eastern practice of the wheel, hanging, impaling, placarding, and crucifixion (WHIPC) into the scholarship of crucifixion, which has been too dominated by the Greek and Roman practice. WHIPC can be defined as the exposure of a body via affixing, by any means, to a structure, wooden or otherwise, for public display (Chapter 2). Linguistic analysis of relevant sources in several languages (including Egyptian hieroglyphics, Sumerian, Hebrew, Hittite, Old Persian, all phases of ancient Greek, and Latin) shows that because of imprecise terminology, any realistic definition of WHIPC must be broad (Chapter 3). Using methodologies and interdisciplinary approaches drawn from art history, archaeology, linguistic analysis, and digital humanities, this work analyzes scattered but abundant evidence to piece together theories about who was crucified, when, how, where, and why. The dissertation proves that WHIPC records, written and visual, were kept for three primary functions: to advertise power, to punish and deter, and to perform magical rituals or fulfill religious obligations. Manifestations of these three functions come through WHIPC in mythology (see especially Chapter 4), trophies (Chapter 5), spectacles, propaganda, political commentary, executions, corrective torture, behavior modification or prevention, donative sacrifices, scapegoat offerings, curses, and healing rituals. …
Date: December 2017
Creator: Foust, Kristan Ewin
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Evolution and Devolution of Inpatient Psychiatric Services: From Asylums to Marketing Madness and Their Impact on Adults and Older Adults with Severe Mental Illness (open access)

Evolution and Devolution of Inpatient Psychiatric Services: From Asylums to Marketing Madness and Their Impact on Adults and Older Adults with Severe Mental Illness

I examined the factors that led to the rise and fall of psychiatric hospitals and its impact on two select groups of individuals: adults and older adults with severe mental illness. To explore the reasons behind these fluctuations, the State of Texas was used as a case study. Additionally, the fluctuations occurred for different reasons in public vs. for-profit investor-owned psychiatric hospitals. Using an investor-owned psychiatric hospital organization as a case study, I investigated the differences in factors that influenced the growth and/or demise in public vs. investor-owned psychiatric hospitals. Evolution and devolution of psychiatric hospitals was assessed during select time periods: 1700 to1930, 1940 to1970, 1980 to 2000, and 2000 to present. Time period selections were relevant to the important drivers of the span of time that influenced the psychiatric hospitals. Historical review and trend analysis was used to identify the total number of psychiatric hospitals and/or total number of psychiatric hospital beds and psychiatric hospitals by type. Analysis showed there was a cyclical pattern of evolution and devolution of psychiatric hospitals and each cycle altered the form, function, and role of the psychiatric hospital along with altering the location of care for adults and older adults with severe …
Date: May 2017
Creator: Helmicki, Soni
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Historical Development of Tertiary Education in the Bahamas: The College of the Bahamas, Past, Present, and Future. (open access)

The Historical Development of Tertiary Education in the Bahamas: The College of the Bahamas, Past, Present, and Future.

The purpose of this study was to provide a historical overview of the development of the College of the Bahamas, and to examine the development of the College of the Bahamas in light of the College of the Bahamas Act of 1974 and the subsequent Act of 1995. The research was qualitative in nature using historical analysis. The primary means of investigation were analyses of both primary and secondary documents and interviews with key individuals who were important to the development of the College of the Bahamas since the 1960s. The methods of triangulation of data and findings were complemented by member checks to affirm the basic findings of the study. The study was limited in scope to the College of the Bahamas to the exclusion of other tertiary institutions within the country. The College of the Bahamas has advanced greatly and has largely fulfilled the directives and goals of the Act of 1974 and is currently engaged in efforts to meet the goals of the Act of 1995.
Date: May 2010
Creator: Dames, Terren L.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Las Cantigas de Santa Maria: Thirteenth-Century Popular Culture and Acts of Subversion (open access)

Las Cantigas de Santa Maria: Thirteenth-Century Popular Culture and Acts of Subversion

Across medieval Europe, the pilgrimage route to Santiago de Compostela in Spain traced a lattice web of popular culture. From the lowest peasant to the greatest king and churchmen, the devout walked pathways that created an economy and contributed to a social and political climate of change. Central to this impulse of piety and wanderlust was the veneration of the Virgin Mary. She was, however, not the iconic Mother of the New Testament whose character, actions, and very name are nearly absent from that first-century compilation of texts. As characterized in the words of popular songs and tales, the mariales, she was a robust saint who performed acts of healing that exceeded those miracles of Jesus described in the Bible. Unafraid and authoritative, she confronted demons and provided judgement that reached beyond the understanding and mercy of medieval codes of law. Holding out the promise of protection from physical and spiritual harm, she attracted denizens of admirers who included poets, minstrels, and troubadours like Nigel of Canterbury, John of Garland, Gonzalo de Berceo, and Gautier de Coinci. They popularized her cult across Europe; pilgrims sang their songs and celebrated the new attributes of Mary. This dissertation uses the greatest collection …
Date: August 2016
Creator: Coats, Jerry Brian
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Evolution, Not Revolution: The Effect of New Deal Legislation on Industrial Growth and Union Development in Dallas, Texas (open access)

Evolution, Not Revolution: The Effect of New Deal Legislation on Industrial Growth and Union Development in Dallas, Texas

The New Deal legislation of the 1930s would threaten Dallas' peaceful industrial appearance. In fact, New Deal programs and legislation did have an effect on the city, albeit an unbalanced mixture of positive and negative outcomes characterized by frustrated workers and industrial intimidation. To summarize, the New Deal did not bring a revolution, but it did continue an evolutionary change for reform. This dissertation investigated several issues pertaining to the development of the textile industry, cement industry, and the Ford automobile factory in Dallas and its labor history before, during, and after the New Deal. New Deal legislation not only created an avenue for industrial workers to achieve better representation but also improved their working conditions. Specifically focusing on the textile, cement, and automobile industries illustrates that the development of union representation is a spectrum, with one end being the passive but successful cement industry experience and the other end being the automobile industry union efforts, which were characterized by violence and intimidation. These case studies illustrate the changing relationship between Dallas labor and the federal government as well as their local management. Challenges to the open shop movement in Dallas occurred before the creation of the New Deal, but …
Date: August 2010
Creator: Welch, M. Courtney
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Influence of Urban Green Spaces on Declining Bumble Bees (Hymenoptera: Apidae) (open access)

The Influence of Urban Green Spaces on Declining Bumble Bees (Hymenoptera: Apidae)

Bumble bees (Bombus spp.) are adept pollinators of countless cultivated and wild flowering plants, but many species have experienced declines in recent decades. Though urban sprawl has been implicated as a driving force of such losses, urban green spaces hold the potential to serve as habitat islands for bumble bees. As human populations continue to grow and metropolitan areas become larger, the survival of many bumble bee species will hinge on the identification and implementation of appropriate conservation measures at regional and finer scales. North Texas is home to some the fastest-growing urban areas in the country, including Denton County, as well as at least two declining bumble bee species (B. pensylvanicus and B. fraternus). Using a combination of field , molevular DNA and GIS methods I evaluated the persistence of historic bumble bee species in Denton County, and investigated the genetic structure and connectivity of the populations in these spaces. Field sampling resulted in the discovery of both B. pensylvanicus and B. fraternus in Denton County's urban green spaces. While the relative abundance of B. fraternus in these spaces was significantly lower than historic levels gleaned from museum recors, that of B. pensylvanicus was significantly higher. Statistical analyses found …
Date: May 2016
Creator: Beckham, Jessica L.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Laureates’ Lens: Exposing the Development of Literary History and Literary Criticism From Beneath the Dunce Cap (open access)

The Laureates’ Lens: Exposing the Development of Literary History and Literary Criticism From Beneath the Dunce Cap

In this project, I examine the impact of early literary criticism, early literary history, and the history of knowledge on the perception of the laureateship as it was formulated at specific moments in the eighteenth century. Instead of accepting the assessments of Pope and Johnson, I reconstruct the contemporary impact of laureate writings and the writing that fashioned the view of the laureates we have inherited. I use an array of primary documents (from letters and journal entries to poems and non-fiction prose) to analyze the way the laureateship as a literary identity was constructed in several key moments: the debate over hack literature in the pamphlet wars surrounding Elkanah Settle’s The Empress of Morocco (1673), the defense of Colley Cibber and his subsequent attempt to use his expertise of theater in An Apology for the Life of Colley Cibber (1740), the consolidation of hack literature and state-sponsored poetry with the crowning of Colley Cibber as the King of the Dunces in Pope’s The Dunciad in Four Books (1742), the fashioning of Thomas Gray and William Mason as laureate rejecters in Mason’s Memoirs of the Life and Writings of William Whitehead (1788), Southey’s progressive work to abolish laureate task writing …
Date: December 2015
Creator: Moore, Lindsay Emory
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Cattle Capitalists: The XIT Empire in Texas and Montana (open access)

Cattle Capitalists: The XIT Empire in Texas and Montana

The Texas Constitution of 1876 set aside three million acres of Texas public land in exchange for construction of the monumental red granite Capitol that continues to house Texas state government today. The Capitol project and the land went to an Illinois syndicate led by men influential in business and politics. Austin's statehouse is a recognizable symbol of Texas around the world. So too, the massive Panhandle tract given in exchange -- what became the "fabulous" XIT Ranch -- has come to, for many, symbolize Texas and its role in the nineteenth century cattle boom. After finding sales prospects for the land, known as the Capitol Reservation, weak at the time, backed by British capital, the Illinois group, often called the Capitol Syndicate, turned their efforts to cattle ranching to satisfy investors until demand for the land increased. The operation included a satellite ranch in Montana to which two-year-old steers from Texas were sent for fattening, often "over the trail" on a route increasingly blocked by people and settlement. Rather than a study focused on ranching operations on the ground -- the roundups, the cattle drives, the cowboys -- this instead uncovers the business and political side of the Syndicate's …
Date: December 2017
Creator: Miller, Michael M.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Concept of Purgatory in England (open access)

The Concept of Purgatory in England

It is not the purpose of this dissertation to present a history of Purgatory; rather, it is to show through the history the influence of purgatorial doctrine on the English lay community and the need of that community for this doctrine. Having established the importance this doctrine held for so many in England, with an examination of the chantry institution in England, this study then examines how this doctrine was stripped away from the laity by political and religious reformers during the sixteenth century. Purgatorial belief was adversely affected when chantries were closed in execution of the chantry acts under Henry VIII and Edward VI. These chantries were vital to the laity and not moribund institutions. Purgatorial doctrine greatly influenced the development and concept of the medieval English community. Always seen to be tightly knit, this community had a transgenerational quality, a spiritual and congregational quality, and a quality extending beyond the grave. The Catholic Church was central to this definition of community, distributing apotropaic powers, enhancing the congregational aspects, and brokering the relationship with the dead. The elements of the Roman liturgy were essential to community cohesiveness, as were the material and ritual supports for this liturgy. The need …
Date: August 2010
Creator: Machen, Chase E.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
First Movement of the Beethoven Third Piano Concerto: An Argument for the Alkan Cadenza (open access)

First Movement of the Beethoven Third Piano Concerto: An Argument for the Alkan Cadenza

The goal of this dissertation is not only to introduce the unique cadenza by Alkan but also to offer an argument from the performer’s point of view, for why Alkan’s cadenza should be considered when there exists a cadenza by Beethoven himself, not to mention those by a number of other composers, both contemporaries of Beethoven and later. Information in reference to the brief history of the cadenza and the pianoforte in the time of Mozart and Beethoven is presented in Chapter 2. A brief bibliography about Alkan is presented in Chapter 3. Chapter 4 describes not only the cadenza in the era of Alkan, but also a comparison which is presented between Beethoven and Alkan's cadenzas. Examples of the keyboard range, dynamic contrast, use of pedal and alternating notes or octaves, and creative quote are presented in Chapter 4. In conclusion, the revival of Alkan's cadenza is mentioned, and the author's hope to promote the Alkan's cadenza is presented in Chapter 5.
Date: May 2015
Creator: Ding, Yang
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Modeling the Effects of Chronic Toxicity of Pharmaceutical Chemicals on the Life History Strategies of Ceriodaphnia Dubia:  a Multigenerational Study (open access)

Modeling the Effects of Chronic Toxicity of Pharmaceutical Chemicals on the Life History Strategies of Ceriodaphnia Dubia: a Multigenerational Study

Trace quantities of pharmaceuticals (including carbamazepine and sertraline) are continuously discharged into the environment, which causes concern among scientists and regulators regarding their potential long-term impacts on aquatic ecosystems. These compounds and their metabolites are continuously interacting with the orgranisms in various life stages, and may differentially influence development of embryo, larvae, juvenile, and adult stages. To fully understand the potential ecological risks of two candidate pharmaceutical chemicals (carbamazepine (CBZ) and sertraline (SERT)) exposure on survival, growth and reproduction of Ceriodaphnia dubia in three sucessive generations under static renewal toxicity test, a multigenerational approach was taken. Results indicate that SERT exposure showed higher sensitivity to chronic exposure to C. dubia growth and reproduction than CBZ exposure. The lowest concentration to affect fecundity and growth was at 50 µg L-1 SERT in the first two generations. These parameters become more sensitive during the third generation where the LOEC was 4.8 µg L-1. The effective concentrations (EC50) for the number of offspring per female, offspring body size, and dry weight were 17.2, 21.2, and 26.2 µg SERT L-1, respectively. Endpoints measured in this study demonstrate that chronic exposure of C. dubia to SERT leads to effects that occur at concentrations an order …
Date: December 2013
Creator: Lamichhane, Kiran
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Bobwhite Population Decline: Its History, Genetic Consequences, and Studies on Techniques for Locating and Assessing Current Populations (open access)

The Bobwhite Population Decline: Its History, Genetic Consequences, and Studies on Techniques for Locating and Assessing Current Populations

The northern bobwhite (Colinus virginianus) population decline is a severe, rangewide phenomenon beginning >150 years ago and continuing today. In this investigation, I: 1. document the timeline of bobwhite population decline and unintended genetic consequences of attempted remedies, 2) develop a model useful for predicting possible locations of potentially sustainable bobwhite populations in semiarid rangeland in Texas and Oklahoma, and 3) examine the relationship between population monitoring data and meteorological factors. While breeding season call counts of male bobwhite have been used for >70 years to provide estimates of fall populations for hunting, most studies of call counts have focused on mathematics and statistical accuracy of the count, largely overlooking the influence of meteorological factors on call counts. Here, I present the results of >4,400 individual point counts and examine their relationship with meteorological variables recorded at each stop. Humidity was positively correlated with the number of birds recorded (ρ = 0.275, p < 0.001) and temperature was negatively correlated (ρ = -0.252, p < 0.001). The number of birds recorded was significantly higher in wet years than in drought years. There was no significant correlation between wind velocity and number of birds recorded. These results suggest that, while weather …
Date: May 2019
Creator: Whitt, Jeffrey Glen
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Old Alcalde: Oran Milo Roberts, Texas's Forgotten Fire-Eater (open access)

The Old Alcalde: Oran Milo Roberts, Texas's Forgotten Fire-Eater

Oran Milo Roberts was at the center of every important event in Texas between 1857 and 1883. He served on the state supreme court on three separate occasions, twice as chief justice. As president of the 1861 Secession Convention he was instrumental in leading Texas out of the Union. He then raised and commanded an infantry regiment in the Confederate Army. After the Civil War, Roberts was a delegate to the 1866 Constitutional Convention and was elected by the state legislature to the United States Senate, though Republicans in Congress refused to seat him. He served two terms as governor from 1879 to 1883. Despite being a major figure in Texas history, there are no published biographies of Roberts. This dissertation seeks to examine Roberts's place in Texas history and analyze the factors that drove him to seek power. It will also explore the major events in which he participated and determine his historical legacy to the state.
Date: May 2016
Creator: Yancey, William C.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Ours is the Kingdom of Heaven: Racial Construction of Early American Christian Identities (open access)

Ours is the Kingdom of Heaven: Racial Construction of Early American Christian Identities

This project interrogates how religious performance, either authentic or contrived, aids in the quest for freedom for oppressed peoples; how the rhetoric of the Enlightenment era pervades literatures delivered or written by Native Americans and African Americans; and how religious modes, such as evoking scripture, performing sacrifices, or relying upon providence, assist oppressed populations in their roles as early American authors and speakers. Even though the African American and Native American populations of early America before the eighteenth century were denied access to rights and freedom, they learned to manipulate these imposed constraints--renouncing the expectation that they should be subordinate and silent--to assert their independent bodies, voices, and spiritual identities through the use of literary expression. These performative strategies, such as self-fashioning, commanding language, destabilizing republican rhetoric, or revising narrative forms, become the tools used to present three significant strands of identity: the individual person, the racialized person, and the spiritual person. As each author resists the imposed restrictions of early American ideology and the resulting expectation of inferior behavior, he/she displays abilities within literature (oral and written forms) denied him/her by the political systems of the early republican and early national eras. Specifically, they each represent themselves in three …
Date: May 2016
Creator: Robinson, Heather Lindsey
Object Type: Thesis or Dissertation
System: The UNT Digital Library