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504 Matching Results
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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
System:
The UNT Digital Library
Molecular and Functional Characterization of Medicago Truncatula Npf17 Gene
Legumes are unique among plants for their ability to fix atmospheric nitrogen with the help of soil bacteria rhizobia. Medicago truncatula is used as a model legume to study different aspects of symbiotic nitrogen fixation. M. truncatula, in association with its symbiotic partner Sinorhizobium meliloti, fix atmospheric nitrogen into ammonia, which the plant uses for amino acid biosynthesis and the bacteria get reduced photosynthate in return. M. truncatula NPF1.7 previously called MtNIP/LATD is required for symbiotic nitrogen fixing root nodule development and for normal root architecture. Mutations in MtNPF1.7 have defects in these processes. MtNPF1.7 encodes a member of the NPF family of transporters. Experimental results showing that MtNPF1.7 functioning as a high-affinity nitrate transporter are its expression restoring chlorate susceptibility to the Arabidopsis chl1-5 mutant and high nitrate transport in Xenopus laevis oocyte system. However, the weakest Mtnip-3 mutant allele also displays high-affinity nitrate transport in X. laevis oocytes and chlorate susceptibility to the Atchl1-5 mutant, suggesting that MtNPF1.7 might have another biochemical function. Experimental evidence shows that MtNPF1.7 also functions in hormone signaling. Constitutive expression of MtNPF1.7 in several species including M. truncatula results in plants with a robust growth phenotype. Using a synthetic auxin reporter, the presence …
Date:
December 2013
Creator:
Salehin, Mohammad
System:
The UNT Digital Library
Multi-year Operation Effect of Geothermal Heat Exchanger on Soil Temperature for Unt Zero Energy Lab
Ground source heat pump (GSHP) uses earth’s heat to heat or cool space. Absorbing heat from earth or rejecting heat to the earth, changes soil’s constant temperature over the multiple years. In this report we have studied about Soil temperature change over multiple years due to Ground loop heat exchanger (GLHE) for Zero Energy Research Laboratory (ZØE) which is located in Discovery Park, University of North Texas, Denton, TX. We did 2D thermal analysis GLHP at particular Depth. For simulation we have used ANSYS workbench for pre-processing and FLUENT ANYS as solver. TAC Vista is software that monitors and controls various systems in ZØE. It also monitors temperature of water inlet/outlet of GLHE. For Monitoring Ground temperatures at various depths we have thermocouples installed till 8ft from earth surface, these temperatures are measured using LabVIEW. From TAC Vista and LabVIEW Reading’s we have studied five parameters in this report using FLUENT ANSYS, they are; (1) Effect of Time on soil Temperature change over Multi-years, (2) Effect of Load on soil temperature change over Multi-years, (3) Effect of Depth on soil temperature change over Multi-years, (4) Effect of Doubling ΔT of inlet and outlet of GLHE on soil temperature change over …
Date:
December 2013
Creator:
Walikar, Vinayak P.
System:
The UNT Digital Library
Nano-crystallization Inhibition in 5 Nm Ru Film Diffusion Barriers for Advanced Cu-interconnect
As the semiconductor industries are moving beyond 22 nm node technology, the currently used stacked Ta/TaN diffusion barrier including a copper seed will be unable to fulfill the requirements for the future technologies. Due to its low resistivity and ability to perform galvanic copper fill without a seed layer, ruthenium (Ru) has emerged as a potential copper diffusion barrier. However, its crystallization and columnar nanostructure have been the main cause of barrier failures even at low processing temperatures (300 oC -350 oC). In this study, we have proposed and evaluated three different strategies to improve the performance of the ultrathin Ru film as a diffusion barrier for copper. The first study focused on shallow surface plasma irradiation/amorphization and nitridation of 5 nm Ru films. Systematic studies of amorphization and nitrogen incorporation versus sample bias were performed. XPS, XRD and RBS were used to determine the physico-chemical, crystallization and barrier efficiency of the plasma modified Ru barrier. The nitrogen plasma surface irradiation of Ru films at substrate bias voltage of -350 V showed an improved barrier performance up to 400 oC annealing temperatures. The barrier barely started failing at 450 oC due mainly to nitrogen instability. The second study involved only …
Date:
December 2013
Creator:
Sharma, Bed P.
System:
The UNT Digital Library
A New Era of Educational Assessment: the Use of Stratified Random Sampling in High Stakes Testing
Although sampling techniques have been used effectively in education research and practice it is not clear how stratified random sampling techniques apply to high-stakes testing in the current educational environment. The present study focused on representative sampling as a possible means for reducing the quantity of state-administered tests in Texas public education. The purpose of this study was two-fold: (1) to determine if stratified random sampling is a viable option for reducing the number of students participating in Texas state assessments, and (2) to determine which sampling rate provides consistent estimates of the actual test results among the population of students. The study examined students’ scaled scores, percent of students passing, and student growth over a three-year period on state-mandated assessments in reading, mathematics, science, and social studies. Four sampling rates were considered (10%, 15%, 20%, & 25%) when analyzing student performance across demographic variables, including population estimates by socioeconomic status, limited English proficiency, and placement in special education classes. The data set for this study included five school districts and 68,641 students. Factorial ANOVAs were used initially to examine the effects of sampling rate on bias in reading and mathematics scores and bias in percentage of students passing these …
Date:
December 2013
Creator:
Brown, Stephanie N.
System:
The UNT Digital Library
Novel Semi-Conductor Material Systems: Molecular Beam Epitaxial Growth and Characterization
Semi-conductor industry relies heavily on silicon (Si). However, Si is not a direct-band gap semi-conductor. Consequently, Si does not possess great versatility for multi-functional applications in comparison with the direct band-gap III-V semi-conductors such as GaAs. To bridge this gap, what is ideally required is a semi-conductor material system that is based on silicon, but has significantly greater versatility. While sparsely studied, the semi-conducting silicides material systems offer great potential. Thus, I focused on the growth and structural characterization of ruthenium silicide and osmium silicide material systems. I also characterized iron silicon germanide films using extended x-ray absorption fine structure (EXAFS) to reveal phase, semi-conducting behavior, and to calculate nearest neighbor distances. The choice of these silicides material systems was due to their theoretically predicted and/or experimentally reported direct band gaps. However, the challenge was the existence of more than one stable phase/stoichiometric ratio of these materials. In order to possess the greatest control over the growth process, molecular beam epitaxy (MBE) has been employed. Structural and film quality comparisons of as-grown versus annealed films of ruthenium silicide are presented. Structural characterization and film quality of MBE grown ruthenium silicide and osmium silicide films via in situ and ex situ …
Date:
December 2013
Creator:
Elmarhoumi, Nader M.
System:
The UNT Digital Library
Origin and Role of Factor Viia
Factor VII, the initiator of the extrinsic coagulation cascade, circulates in human plasma mainly in its zymogen form, Factor VII and in small amounts in its activated form, Factor VIIa. However, the mechanism of initial generation of Factor VIIa is not known despite intensive research using currently available model systems. Earlier findings suggested serine proteases Factor VII activating protease, and hepsin play a role in activating Factor VII, however, it has remained controversial. In this work I estimated the levels of Factor VIIa and Factor VII for the first time in adult zebrafish plasma and also reevaluated the role of the above two serine proteases in activating Factor VII in vivo using zebrafish as a model system. Knockdown of factor VII activating protease did not reduce Factor VIIa levels while hepsin knockdown reduced Factor VIIa levels. After identifying role of hepsin in Factor VII activation in zebrafish, I wanted to identify novel serine proteases playing a role in Factor VII activation. However, a large scale knockdown of all serine proteases in zebrafish genome using available knockdown techniques is prohibitively expensive. Hence, I developed an inexpensive gene knockdown method which was validated with IIb gene knockdown, and knockdown all serine proteases …
Date:
December 2013
Creator:
Khandekar, Gauri
System:
The UNT Digital Library
Overcapacity
Overcapacity is a self-reflexive, personal journey film that explores the filmmaker's exploration of his lifelong problem with obesity and health. The film follows his progress as he discusses his weight problem with his partner and parents as well as works with a personal trainer and doctor in an effort to affect a lifestyle change while also confronting issues that have led to and perpetuate his current health situation.
Date:
December 2013
Creator:
Ferguson, Ryan
System:
The UNT Digital Library
Parameter Estimation Using Consensus Building Strategies with Application to Sensor Networks
Sensor network plays a significant role in determining the performance of network inference tasks. A wireless sensor network with a large number of sensor nodes can be used as an effective tool for gathering data in various situations. One of the major issues in WSN is developing an efficient protocol which has a significant impact on the convergence of the network. Parameter estimation is one of the most important applications of sensor network. In order to model such large and complex networks for estimation, efficient strategies and algorithms which take less time to converge are being developed. To deal with this challenge, an approach of having multilayer network structure to estimate parameter and reach convergence in less time is estimated by comparing it with known gossip distributed algorithm. Approached Multicast multilayer algorithm on a network structure of Gaussian mixture model with two components to estimate parameters were compared and simulated with gossip algorithm. Both the algorithms were compared based on the number of iterations the algorithms took to reach convergence by using Expectation Maximization Algorithm.Finally a series of theoretical and practical results that explicitly showed that Multicast works better than gossip in large and complex networks for estimation in consensus …
Date:
December 2013
Creator:
Dasgupta, Kaushani
System:
The UNT Digital Library
Paul and Slavery: a Conflict of Metaphor and Reality
The debate on Paul’s views on slavery has ranged from calling him criminal in his enforcement of the status quo to rallying behind his idea of equal Christians in a community. In this thesis I blend these two major views into the idea that Paul supported both the institution of slavery and the slave by legitimizing the role of the slave in Christian theology. This is done by reviewing the mainstream views of slavery, comparing them to Paul’s writing, both the non-disputed and disputed, and detailing how Paul’s presentation of slavery differed from mainstream views. It is this difference which protects the slave from their master and brings attention to the slave’s actions and devotion. To Paul, slavery was a natural institution which should be emulated Christian devotion. He did not challenge the Romans but called for Christians to challenge the mainstream views of the roles of slavery in the social hierarchy of their communities.
Date:
December 2013
Creator:
Baker, James C.
System:
The UNT Digital Library
Perceived Parent-child Relationship Quality’s Moderation Effect on the Acculturation-wellbeing Relationship Among Young Adults From Immigrant Families
The current study examined relationships among acculturation, parent-child relationship quality, and selected wellbeing indicators (health-related quality of life, life satisfaction, anxiety, depression, and stress) among a group of young adults from immigrant families of Asian and Hispanic descent. The first goal of the current study was to replicate previous research demonstrating a mixed relationship between acculturation and the wellbeing indicators. The second was to explain this relationship by testing for a moderation effect of parental care on the acculturation-wellbeing relationship. An examination of differences between members of the two ethnic groups on all measured variables served an exploratory purpose. Participants included 204 participants of Asian (N =80) and Hispanic (N = 124) descent who came from an immigrant family, or a family in which at least one parent was born outside of the U.S. Eligible respondents were also current students at the University of the North Texas who fell within the age range of 18-24, and the data for the current study was selected from a larger dataset (N = 1064). Results indicated that higher acculturation levels had a positive effect on each wellbeing indicator. Father Care and Mother Care were found to be significantly positively correlated with most outcome …
Date:
December 2013
Creator:
Griffin, Allison M.
System:
The UNT Digital Library
Performer’s Guide to the Execution and Application of Karen Tuttle’s Coordination, As Applied to Ernest Bloch’s Suite Hébraïque
Legendary violist and pedagogue Karen Tuttle developed a new approach to playing the viola known as Coordination. Coordination consists of a deep emotional connection to music, as well as highly specific motions of the body. This document details the execution of the physical motions of Coordination, through written descriptions and multimedia examples. A detailed discussion of the application of the motions is presented, using notated examples from Ernest Bloch’s Suite Hébraïque.
Date:
December 2013
Creator:
Sander, Amber
System:
The UNT Digital Library
Photochemical and Photophysical Properties of Mononuclear and Multinuclear Closed Shell D10 Coinage Metal Complexes and Their Metallo-organometallic Adducts
This dissertation covers the studies of two major topics: the photochemistry of mononuclear and multinuclear gold(I) complexes and synthetic approaches to tailor photophysical properties of cyclic trinuclear d10 complexes. First a detailed photochemical examination into the photoreactivity of neutral mononuclear and multinuclear gold(I) complexes is discussed, with the aim of gold nanoparticle size and shape control for biomedical and catalysis applications. Next is a comprehensive systematic synthetic approach to tailor the photophysical properties of cyclic trinuclear d10 complexes. This synthetic approach includes an investigation of structure-luminescence relationships between cyclic trinuclear complexes, an examination into their π-acid/π-base reactivity with heavy metal cations and an exploration into the photophysical properties of new heterobimetallic cyclic trinuclear complexes. These photophysical properties inspections are used to screen materials for their employment in molecular electronic devices such as organic light-emitting diodes (OLEDs) and thin film transistors (OTFTs).
Date:
December 2013
Creator:
McDougald, Roy N., Jr.
System:
The UNT Digital Library
Phototoxic Effects of Titanium Dioxide Nanoparticles on Daphnia Magna
Titanium dioxide nanoparticles (TiO2-NP) are one of the most abundantly utilized nanomaterials in the world. Studies have demonstrated the mechanism of acute toxicity in TiO2-NP to be the production of reactive oxygen species (ROS) leading to oxidative stress and mortality in exposed organisms. It has also been demonstrated that the anatase crystalline conformation is capable of catalyzing the cleavage of water molecules to further increase the concentration of ROS in the presence of ultraviolet radiation. This photoenhanced toxicity significantly lowers the toxicity threshold of TiO2-NP to environmentally relevant concentrations (ppb). The goal of this study was to determine whether dietary uptake and accumulation of TiO2-NP in the aquatic filter feeder Daphnia magna resulted in photoenhanced toxicity. D. magna and S. caprincornatum were exposed to aqueous solutions of 20ppm and 200ppm TiO2-NP for 24hrs and then transferred to clean moderately hard water. Samples were taken at various time points, dried, and TiO2 quantified using ICP-MS. Toxicity assays were run on D. magna using three TiO2-NP (20ppm, 200ppm) exposure protocols and two ultraviolet radiation treatments. The first exposure group was exposed to aqueous solutions of TiO2-NP for the duration of the test. The second exposure group was exposed to TiO2-NP for an …
Date:
December 2013
Creator:
Mansfield, Charles M.
System:
The UNT Digital Library
Pocky Wenches Versus La Pauvre Femme: Medical Perceptions of Venereal Disease in Seventeenth-century England and France
In early modern Europe, syphilis tormented individuals regardless of social standing. The various stages of infection rendered individuals with visible chancres or “pocky” marks throughout their body. The tertiary stage signaled the spreading of the disease from the infected parts into the brain and cardiovascular system, eventually leading to dementia and a painful death. Beginning with the initial medical responses to venereal disease in the sixteenth century and throughout the early modern period, medical practitioners attempted to identify the cause of syphilis. During the seventeenth century, English practitioners maintained that women were primarily responsible for both the creation and transmission of syphilis. In England, venereal disease became the physical manifestation of illicit sexual behavior and therefore women with syphilis demonstrated their sexual immorality. Contrastingly, French medical practitioners refrained from placing blame on women for venereal infection. The historiography of early modern discourse on venereal disease fails to account for this discrepancy between English and French perceptions of syphilis in the seventeenth century. This thesis seeks to fill the gap in this historiography and suggest why French practitioners abstained from singling out women as the primary source of venereal infection by suggesting the importance that cultural influences and religious practices had …
Date:
December 2013
Creator:
Findlater, Michelle J.
System:
The UNT Digital Library
The Political, Economic, and Military Decline of Venice Leading Up to 1797
This thesis discusses the decline of the Venetian nobility, the collapse of the Venetian economy, and the political results of the surrender of the Venetian Republic to Napoleon Bonaparte in 1797. Topics include the formation of Venice, Venetian domination of trade, the class system in Venice prior to 1797, the collapse of the aristocracy, feudalism in Venice, Venice’s presence in the Adriatic and Aegean seas, and the rise of the middle class within the provisional democratic government. Very few historians have attempted to research the provisional democracy of Venice and how the political and class structure of Venice changed as a result of the collapse of the Republic in 1797. Using primary sources, including government documents and contemporary histories, one can see how the once dominant noble class slowly fell victim to economic ruin and finally lost their role in the political leadership of Venice all together. During this same period, the middle class went from only holding secretarial jobs within the government, to leaders of a modern democratic movement. On top of primary research, several secondary sources helped in explaining the exclusivity of the noble class and their journey from economic dominance to economic ruin and the administrative consequences …
Date:
December 2013
Creator:
FitzSimons, Anna Katelin
System:
The UNT Digital Library
Population Dynamics of Zebra Mussels (Dreissena Polymorpha) in a North Texas Reservoir: Implications for Invasions in the Southern United States
This dissertation has two main objectives: first, quantify the effects of environmental conditions on spatio-temporal spawning and larval dynamics of zebra mussels (Dreissena polymorpha [Pallas 1771]) in Lake Texoma, and second, quantify the effects of environmental conditions on survival, growth, and reproduction of young of the year (YOY) juvenile zebra mussels. These biological responses directly influence population establishment success and invasive spread dynamics. Reproductive output of the zebra mussel population in Lake Texoma was significantly related to water temperature and lake elevation. Annual maximum larval (veliger) density decreased significantly indicating a population crash, which was likely caused by thermal stress and variability of lake elevation. In 2011, temperatures peaked at 34.3°C and lake elevation decreased to the lowest level recorded during the previous 18 years, which desiccated a substantial number of settled mussels in littoral zones. Estimated mean date of first spawn in Lake Texoma was observed approximately 1.5 months earlier than in Lake Erie, and peak veliger densities were observed two months earlier. Veligers were observed in the deepest oxygenated water after lake stratification. During a 69-day in situ experiment during summer in Lake Texoma, age-specific mortality of zebra mussels was generally high until temperatures decreased to approximately 28°C, …
Date:
December 2013
Creator:
Churchill, Christopher J.
System:
The UNT Digital Library
Postoperative Neuropsychological Outcomes in Pediatric Patients Undergoing Temporal Lobe Epilepsy Surgery
The purpose of this study was to investigate the neuropsychological outcomes of pediatric subjects undergoing temporal lobe surgery, and then compare the outcomes between subjects in the iMRI and the standard operating suites. This study involved 77 children ages one to 21 years (M = 11.98) at time of surgery for intractable epilepsy. Forty-seven returned for repeat neuropsychological assessment. At baseline, subjects with early onset of epilepsy (≤ 7 years) scored worse on a measure of attention (p = .02), FSIQ (p < .01), perceptual reasoning (p < .01), and processing speed (p = .06). At one-year follow-up, interactions were observed for the response style domain of the attention measure (p = .03), FSIQ (p = .06) and working memory (p = .08). Follow-up at one year, for the group as a whole, revealed decline in verbal memory (p = .04) and reading comprehension (p = .02); and improvement for word reading (p = .05). No significant differences were observed between the iMRI and standard operating suite. Though, hemisphere, duration of epilepsy, preoperative seizure frequency, lesional disease, seizure type, presence of epileptogenic focus, and number of lobes involved accounted for variance in neuropsychological outcomes. These results provide further support for …
Date:
December 2013
Creator:
Bailey, Laurie J.
System:
The UNT Digital Library
Posttraumatic Stress and Neurobehavioral Symptoms
The purpose of this study is to examine the structure of neurobehavioral symptoms in service members with physical and/or psychological trauma to determine the diagnostic specificity of these symptoms. Previous literature has demonstrated that orthopedic injured, mild traumatic brain injury (MTBI), and healthy controls shared similar levels of postconcussive symptom complaints, which suggest that postconcussion-like symptoms are not unique to MTBI. To the best of my knowledge, this is the first study examining this phenomenon in a sample of recently redeployed service members. Dimensional analysis of the PCL-C and NSI using SEM did not produce a model that was consistent with previous literature and principle component analyses did not produce a simple solution for posttraumatic stress or neurobehavioral symptoms. Thus, the study does not provide evidence for construct validity for either instrument. Implications for these findings are that clinicians need to be aware that these instruments may not be measuring coherent constructs within this population as purported and should judiciously interpret and report the results of these instruments.
Date:
December 2013
Creator:
Klein, Robert S.
System:
The UNT Digital Library
Preschool Teachers’ Knowledge of Children’s Mathematical Development and Beliefs About Teaching Mathematics
Early childhood education emphasizes the need of providing high quality early childhood mathematics programs for preschool children. However, there is little research that examines the importance of preschool children’s mathematical knowledge development and teachers’ beliefs about how to teach mathematics to young children. The purposes of this study were to investigate pre-service and in-service preschool teachers’ knowledge of children’s mathematical development and their beliefs about teaching mathematics in the preschool classroom and also to determine how experience differentiates the two groups. This research employed a non-experimental research design with convenient sampling. Ninety-eight pre-service teachers and seventy-seven in-service preschool teachers participated in the research. The Knowledge of Mathematical Development survey (KMD) and the Beliefs survey were used to investigate possible differences between pre-service and in-service preschool teachers’ knowledge of children’s mathematical development and between their beliefs about teaching mathematics. The findings of this study indicate a statistically significant difference between pre-service teachers and in-service preschool teachers in relation to their knowledge of mathematical development. This finding shows that pre-service teachers’ knowledge of children’s mathematical development is somewhat limited; most pre-service teachers have difficulty identifying the process of preschool children’s development of mathematics skills. A second finding reveals a statistically significant difference …
Date:
December 2013
Creator:
Kim, In Hong
System:
The UNT Digital Library
Psychological Diversity Climate and Its Effects: the Role of Organizational Identification
Organizations have begun to focus heavily on diversity. As a result, organizations spend time and resources creating diversity policies and investing extensively in diversity training programs. While an abundance of research exists on demographic diversity, research has just begun to incorporate employees’ perceptions of diversity as an influential factor affecting organizationally relevant employee outcomes. Employees are a crucial reference in understanding whether organizations benefit from engaging in such actions. The purpose of this study is to examine the influence of diversity climate on employees’ organizational identification. Furthermore, I investigate how organizational identification mediates the relationship between diversity climate perceptions and outcomes including turnover intentions, job satisfaction, and organizational citizenship behavior. I refine our understanding by identifying personal characteristics that influence the diversity climate (PDC) – organizational identification (OID) relationship. This research offers several contributions to management literature and scholars as well as practitioners. First this study empirically examines the relationship between PDC and OID. This connection is important as it identifies the psychological mechanism linking PDC to subsequent outcomes as well as showing how positive climate perception can influence an employee’s sense of belonging. The second contribution is the in-depth identification of personal characteristics and their role in this relationship …
Date:
December 2013
Creator:
Cole, Brooklyn M.
System:
The UNT Digital Library
Reclaiming the Flock: Innocent Iii, the 1215 Canon and the Role of the Sacraments in Reforming the Catholic Church
This thesis traces the changes in the sacraments of Baptism and the Eucharist from 400-1215 and posits that Innocent III’s Fourth Lateran Council solidified and clarified these sacraments from diversified practices and customs to a single Catholic orthodoxy in order to reclaim centralized papal power to the Roman Catholic Church. Tracing the history of the Catholic Church’s baptismal and Eucharistic rites encounters a number of logistical obstacles because they were not administered by means of a Western Church-prescribed ritual until the early thirteenth century, primarily because such a prescription did not exist. Even after the First Council of Nicaea where Christian doctrine was better defined, an allowable margin of license remained within Latin orthodoxy, specifically when it came to the practice and administration of the sacraments. Before the establishment of a finite canon the sacramental procedures of the Western Church relied heavily on the local bishops and monks who openly adopted their own preferential liturgies and ritual practices. This fragmentation took the power away from the Holy See in Rome and instead fostered the idea that regional practices were superior. The foundation of their varied interpretations can be traced back to a number of theologians ranging from the early second …
Date:
December 2013
Creator:
Villarreal-Thaggard, Kimberly
System:
The UNT Digital Library
Redeeming the Betrayer: Elgar’s Portrayal of Judas in the Apostles
Despite its generally agreed importance, very little has been written about The Apostles. Even among the extant publications that address The Apostles, scholars have focused on its history and development, its reception, or analytical descriptions of its surface themes. The aim of this study will therefore be to provide neither a biography of Elgar, nor an account of the genesis of the work, but to analyze The Apostles in a manner that will achieve a deeper understanding of the oratorio. Chapter 1 explores the complexities that surround Judas and the different ways in which he was perceived throughout history. Then, through my analysis of the surface motives in Chapter 2 and their significance in relation to the large-scale harmonic structure in Chapter 3, I will suggest that Elgar does not denigrate Judas as the betrayer of Christ in The Apostles, but rather depicts him as a tragic yet crucial figure in achieving the redemption of mankind, and through this Judas himself is redeemed.
Date:
December 2013
Creator:
Taycher, Ryan
System:
The UNT Digital Library
Relationships of Benthic Macroinvertebrate Community Structure with Land-use, Habitat, In-stream Water Chemistry, Depositional Sediment Biofilm Fatty Acids, and Surfactants in the Effluent Dominated Texas Trinity River
The Trinity River is an urbanized, effluent-dominated river, and is heavily relied upon for drinking water. The benthic macroinvertebrate community has been monitored for over 20 years, with the focus of this dissertation on three studies (1987-88, 2005, and 2011). Water quality improvement following dechlorination resulted in increased benthic metrics. Overall habitat quality, in-stream cover, surface water total organic carbon, sediment total organic carbon, near-field urban land-use, near-field forested land-use, surface water surfactant toxic units, and depositional sediment biofilm fatty acids all have statistically significant relationships with benthic macroinvertebrate metrics. These relationships are better defined with increased taxonomic resolution at the genus/species level for all benthic taxa, including Chironomidae and Oligochaeta. It is recommend that benthic identifications for state and city water quality assessments be done at the genus/species level. A novel method for quantifying depositional sediment biofilm fatty acids has been produced and tested in this dissertation. Benthic metrics are directly related to fatty acid profiles, with several essential fatty acids found only at upstream sites.
Date:
December 2013
Creator:
Slye, Jaime L.
System:
The UNT Digital Library