Childhood obesity and resulting secondary complications in youth with disabilities are occurring in epidemic proportions, due in part to a trend of physical inactivity. The purpose of this study is to report the prevalence of overweight, the leisure time activity patterns, and the association between frequency of physically active leisure participation and body mass index for age, in a sample of 50 youth with spina bifida, ages 4.5 to 17.9 years. Results indicate that 52% of the sample are classified as at risk of overweight or overweight; 36% were male and 16% were female. The top five leisure time activities and team sport participation are identified. Subjects who did not use a wheelchair for ambulation participated significantly more in physically active leisure than subjects who used a wheelchair. Future research and rationale for physically active leisure as an intervention for youth with spina bifida are discussed.

Archaeologically site catchment analysis produces valuable information regarding prehistoric subsistence strategies and social organization. Incorporating archaeological data into catchment analyses is an effective strategy to develop regional models of prehistoric site selection and settlement patterns. Digital access to data permits the incorporation of multiple layers of information into the process of synthesizing regional archaeology and interpreting corresponding spatial patterning. GIS software provides a means to integrate digital environmental and archaeological data into an effective tool. Resultant environmental archaeology maps facilitate interpretive analysis. To fulfill the objectives of this thesis, GIS software is employed to construct site catchment areas for archaeological sites and to implement multivariate statistical analyses of physical and biological attributes of catchments in correlation with assemblage data from sites. Guided by ecological, anthropological and geographical theories hypotheses testing evaluates patterns of prehistoric socio-economic behavior. Analytical results are summarized in a model of prehistoric settlement patterns in North Central Texas.

The pyrimidine biosynthetic pathway is an essential pathway for most organisms. Previous research on the pyrimidine pathway in Pseudomonas aeruginosa (PAO1) has shown that a block in the third step of the pathway resulted in both a requirement for exogenous pyrimidines and decreased ability to produce virulence factors. In this work an organism with a mutation in the second step of the pathway, aspartate transcarbamoylase (ATCase), was created. Assays for pyrimidine intermediates, and virulence factors were performed. Results showed that the production of pigments, haemolysin, and rhamnolipids were significantly decreased from PAO1. Elastase and casein protease production were also moderately decreased. In the Caenorhabditis elegans infection model the nematodes fed the ATCase mutant had increased mortality, as compared to nematodes fed wild type bacteria. These findings lend support to the hypothesis that changes in the pyrimidine biosynthetic pathway contribute to the organism's ability to effect pathogenicity.

An NMR spectroscopy study of trimethylsilylmethyllilthium, TMSM-Li, indicates that TMSM-Li exists as two different aggregates in cyclopentane solution. Using previously reported colligative properties of TMSM-Li in different solutions in connection with new 13C and 6Li NMR data collected in this study, aggregation states were assigned as octamer and hexamer. Low temperature 13C and 6Li NMR peak intensities indicated an equilibrium exists between the two aggregates that shifts toward the octamer as the temperature decreases. ΔH was calculated to be 5.23 + 0.15 kcal/mol and ΔS was calculated to be 17.9 + 0.6 eu for the hexamer/octamer equilibrium system. Samples of TMSM-Li were mixed with TMSM-OH in attempts to form mixed alkyllithium/lithium alkoxide aggregates. 13C NMR data for these mixtures gave inconclusive results whether or not these compounds formed, which is different from other primary alkyllithium compounds studied in the past. A study of neopentyllithium, NpLi, indicates only one aggregate in solution with the aggregation state unknown using low temperature 13C NMR spectroscopy.

Designing 802.11 wireless networks includes two major components: selection of access points (APs) in the demand areas and assignment of radio frequencies to each AP. Coverage and capacity are some key issues when placing APs in a demand area. APs need to cover all users. A user is considered covered if the power received from its corresponding AP is greater than a given threshold. Moreover, from a capacity standpoint, APs need to provide certain minimum bandwidth to users located in the coverage area. A major challenge in designing wireless networks is the frequency assignment problem. The 802.11 wireless LANs operate in the unlicensed ISM frequency, and all APs share the same frequency. As a result, as 802.11 APs become widely deployed, they start to interfere with each other and degrade network throughput. In consequence, efficient assignment of channels becomes necessary to avoid and minimize interference. In this work, an optimal AP selection was developed by balancing traffic load. An optimization problem was formulated that minimizes heavy congestion. As a result, APs in wireless LANs will have well distributed traffic loads, which maximize the throughput of the network. The channel assignment algorithm was designed by minimizing channel interference between APs. The …

This thesis will examine the iconography of late-thirteenth- through fifteenth-century images of St. Veronica's veil, also known as vernicles. In the late Middle Ages, vernicle iconography changed from iconic representations of Christ's face toward graphic imagery of Christ's suffering during his Passion. These passionate transformations, as I have called them, were affected by the Roman Sudarium relic, popular devotion to Christ's suffering and humanity during his Passion, and the Catholic ritual of Mass. This thesis will consider how the function of vernicle images during Mass was reflected in their iconography throughout Europe between 1250 and 1500.

This data study concentrates on the past tense marking in the interlanguage (IL) of Chinese speakers of English. Following the assumptions of Hawkins & Lizska, (2003), it is assumed that unlike native speakers of English, Chinese speakers of English have a higher level of optionality within the past tense marking of their grammars. It is claimed that the primary reason for this occurrence is the lack of the functional feature T(ense) [+/-past] in Mandarin Chinese. If a particular functional feature is missing in a learner's L1 grammar, it is thought that it will be absent in one's L2 grammar as well. Three advanced Chinese speakers of English were tested on the past tense marking in their IL production. Both spontaneous oral and reading speech were used for this data analysis.

Peptide mass fingerprinting (PMF) was the first automated method for protein identification in proteomics, and it remains in common usage today because of its simplicity and the low equipment costs for generating fingerprints. However, one of the problems with PMF is its limited specificity and sensitivity in protein identification. Here I present a method that shows potential to significantly enhance the accuracy of peptide mass fingerprinting, using a machine learning approach based on a hidden Markov model (HMM). This method is applied to improve differentiation of real protein matches from those that occur by chance. The system was trained using 300 examples of combined real and false-positive protein identification results, and 10-fold cross-validation applied to assess model discrimination. The model can achieve 93% accuracy in distinguishing correct and real protein identification results versus false-positive matches. The receiver operating characteristic (ROC) curve area for the best model was 0.833.

It has been shown repeatedly that many people hold personality stereotypes of stutterers. The attitudes of psychotherapists regarding stutterers have never been investigated. The present investigation assessed the degree to which psychotherapists-in-training hold stereotypes of stutterers as compared to normally fluent speakers. Two groups viewed a videotaped vignette of a male. In one, the male interviewee displayed stuttering behaviors. In the other, the same male spoke fluently. Participants then rated the male interviewee on several personality dimensions. Contrary to previous findings, the group viewing the stuttering interviewee rated him no differently than did the group viewing the fluent interviewee. Greater knowledge of stuttering was associated with more positive ratings of the person who stuttered. The clinical and research implications of these findings are then discussed.

The work of a police officer is stressful and could potentially lead to burnout. As a result, a variety of reactions may occur which include, cynicism, abuse of authority, and in extreme cases suicide. One method which has been proven to be effective in treating officer stress is counseling; however, because of the policing subculture the opportunity to seek counseling has been ignored. In order to successfully manage officer stress, the subculture must be dealt with. Additionally, the officers' family must also be acknowledged as being affected by officer burnout. Counseling services must be made available to the officer's family and through training they can become a source of support instead of an added source of stress to the officer.

In this study I outline seven characteristics of a traditional Happening (the use of games and play, an inherent intertextual element, an emphasis on place/space, an element/spirit of anarchy, an element of chance, an emphasis on the fusion of art with everyday life, and the existence of both a purpose and a meaning) and seek to determine which characteristics contribute to the Happening's current usage as a rhetorical tool. I created a traditional Happening containing a message of environmental consumption and destruction, and surveyed audience members regarding their interpretation and experience. The survey responses were coded using a top-down narrative analysis. I discovered that intertextuality, place/space, and the fusion of art with everyday life are particularly effective communicators of a message in a socially or politically conscious Happening.

The post Civil War period known as Reconstruction remains a topic of interest for historians. Having avoided the experience of invasion by Northern troops during the Civil War, the people living in the interior of the state of Texas accepted Confederate defeat at first. However, with the instituting of Northern efforts at Reconstruction, such as the installation of Republican interim government officials, the arrival of Freedmen's Bureau agents, and in some parts the stationing of federal troops, conservative whites throughout the state became defiant toward the federal government and its policies. Some white southerners even went so far as to take up arms and become embroiled in open conflict with the federal government and its local institutions. As a result, Unionist whites and freedmen found themselves to be the targets of groups of desperados committed to upholding the Southern Cause and ensuring the return of the conservative Democratic party to power in Texas politics. This study focuses on Hunt County from the years 1860 - 1873 to determine to what extent violence played a role in the era of Reconstruction. An analysis of data primarily from county, state, and federal records forms the basis of this study. The information obtained …

Paris . Rés. Vmd. Ms. 27, known as Tl.1, or the Thibault Manuscript, is one of the earliest extant sources of lute music, containing twenty-four solos and eighty-six accompaniments for vocal compositions. The manuscript was copied in Italian lute tablature lacking rhythm signs, which makes it inaccessible for modern performance. Each selection contains a full score of the four-part vocal concordance, and the reconstructed lute part in both the original notation and keyboard transcription. The introductory study elaborates upon the creation dates for Tl.1 (ca. 1502-1512) through its relationship with the sources of the time and with the older unwritten tradition of Italian secular music that is apparent in the formal treatment of the music.

North Texas State University and the surrounding Denton community enjoyed a quiet college atmosphere throughout most of the 1960s. With the retirement of President J. C. Matthews in 1968, however, North Texas began witnessing the issues most commonly associated with the turbulent decade, such as the struggle for civil rights, the anti-Vietnam War movement, the fight for student rights on campus, and the emergence of the Counterculture. Over the last two years of the decade, North Texas State University and the surrounding community dealt directly with the 1960s and, under the astute leadership of President John J. Kamerick, successfully endured trying times.

TNT (2,4,6-trinitrotoluene) readily and predominantly transforms to 2ADNT (2-amino-4,6-dinitrotoluene) and 4ADNT (4-amino-2,6-dinitrotoluene) in environmental matrixes and tissues. Solid phase microextraction (SPME) was used to extract ADNTs (amino-dinitrotoluenes) from tissue as a potential method to investigate the recalcitrance of metabolically-generated ADNTs versus absorbed ADNTs. Tubifex tubifex was allowed to metabolize TNT into ADNTs in 24-hr static non-renewal exposure test followed by 24-hr depuration in clean reconstituted hard water. Polyacrylate-coated (PA) SPME fibers were then deployed and agitated in tissue homogenates containing metabolically-generated ADNTs for 48 hr to provide a measure of available ADNTs. Extractability of ADNTs from T. tubifex tissue containing metabolically-generated ADNTs was significantly less than extractability of ADNTs from T. tubifex tissue containing absorbed ADNTs: 50-60% and 81-90% of expected extractability based on fiber-water partition ratio. The lower SPME extractability of metabolically-generated ADNTs may stem from the unavailability of metabolically-generated ADNTs sequestered in tissue or bound to tissue macromolecules during metabolism of TNT to ADNT. Tissue extractions using SPMEs may be able to estimate such bound organic residues in tissue and serve as potential indicators of toxicological bioavailability and biomagnification potential of tissue-associated organic compounds.

Research to date on the native versus non-native English speaker teacher (NEST versus non-NEST) debate has primarily focused on teacher self-perception and performance. A neglected, but essential, viewpoint on this issue comes from English as a second language (ESL) students themselves. This study investigated preferences of adults, specifically immigrant and refugee learners, for NESTs or non-NESTs. A 34-item, 5-point Likert attitudinal survey was given to 102 students (52 immigrants, 50 refugees) enrolled in ESL programs in a large metropolitan area in Texas . After responding to the survey, 32 students volunteered for group interviews to further explain their preferences. Results indicated that adult ESL students have a general preference for NESTs over non-NESTs, but have stronger preferences for NESTs in teaching specific skill areas such as pronunciation and writing. There was not a significant difference between immigrants' and refugees' general preferences for NESTs over non-NESTs based on immigration status.

This study identified transition practices used by teachers and/or primary caregivers of infants and toddlers when entering child care programs across Dallas , TX . Participants completed the Program Entry Transition Practices Survey regarding their use of transition practices in fall 2003 and perceived barriers to entry transition practices. Results show frequency tallies, percentages of use for each transition practice, and the mean number of practices used for the entire sample and with the sample split according to participants from profit and non-profit programs. Results were also organized into four subscales based on the type of practice used. Results supported the hypothesis that teachers and caregivers would report more transition practices occurring after beginning care and directed towards a group than those occurring before beginning care and directed towards an individual. In response to the broader research question regarding barriers: Teachers and caregivers from profit and non-profit centers reported similar barriers to implementing transition practices.

The body of work originating from this Problem in Lieu of Thesis consists of paintings on canvas that incorporate representations of plant material. The impetus for the paintings was black and white photocopies created from mounds of plant material placed on a copy machine. The resulting copies contained forms that were organic in appearance, but unrecognizable as known objects. Parts of the most interesting and ambiguous copies were used to develop the imagery of the paintings. The new forms served the purpose of creating visual interest from unexpected images. Combined with traditional painting techniques, the selected forms produced paintings of mysterious and playful worlds similar to those parts of the environment not readily accessed, such as galactic space, microscopic organisms, and ocean depths.

The electronic voting machine (EVM) plays a very important role in a country where government officials are elected into office. Throughout the world, a specific operating system that tends to the specific requirement of the EVM does not exist. Existing EVM technology depends upon the various operating systems currently available, thus ignoring the basic needs of the system. There is a compromise over the basic requirements in order to develop the systems on the basis on an already available operating system, thus having a lot of scope for error. It is necessary to know the specific details of the particular device for which the operating system is being developed. In this document, I evaluate existing EVMs and identify flaws and shortcomings. I propose a solution for a new operating system that meets the specific requirements of the EVM, calling it Voting Operating System (VOS, pronounced 'voice'). The identification technique can be simplified by using the fingerprint technology that determines the identity of a person based on two fingerprints. I also discuss the various parts of the operating system that have to be implemented that can tend to all the basic requirements of an EVM, including implementation of the memory manager, …

The growing number of terrorist attacks waged by Islamic fundamentalists has led to an increasing desire to understand the nature of jihad. These attacks have led to a renewed sense of urgency to find answers to such questions as why these attacks occur, and who they are waged against. Towards this end I turn to examine the political philosophy of four Muslim theologians. Specifically I look at the political philosophy of Sayyid Qutb, Shah Walai Allah Dihlawai, Ibn Rushd (Averroes), and Muhammad Sa'id al-Ashmawy. I find that the notion of jihad is very inconclusive. Furthermore, the question of jihad revolves largely around the question of whether or not individuals can be reasoned with, and secondly whether religion should be compelled upon individuals.