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Results 5971 - 5980 of 10,457
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Noncovalent crosslinking of SH1 and SH2 to detect dynamic flexibility of the SH1 helix

Noncovalent crosslinking of SH1 and SH2 to detect dynamic flexibility of the SH1 helix

Date: August 2000
Creator: Park, Hyunguk
Description: In this experiment, fluorescent N- (1-pyrenyl) iodoacetamide modified the two reactive thiols, SH1 (Cys 707) and SH2 (Cys 697) on myosin to detect SH1-SH2 a -helix melting. The excimer forming property of pyrene is well suited to monitor the dynamics of the SH1 and SH2 helix melting, since the excimer should only form during the melted state. Decreased anisotropy of the excimer relative to the monomeric pyrene fluorescence is consistent with the disordering of the melted SH1-SH2 region in the atomic model. Furthermore, nucleotide analogs induced changes in the anisotropy of the excimer, suggesting that the nucleotide site modulates the flexibility of SH1-SH2 region.
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The Paradox of the Christian Poet: George Herbert's Problematics

The Paradox of the Christian Poet: George Herbert's Problematics

Date: August 2000
Creator: Casey, James Edward
Description: The thesis examines the paradoxes in Herbert's poetry and attributes the many contradictions and vacillations within The Temple to Herbert's own "spiritual conflicts" as a Christian poet. The thesis explores the poems as interconnected expressions of Herbert's dual nature as Christian-Poet. The thesis discusses over sixty of Herbert's poems, concentrating on close readings and intratextual connections. Chapter One reviews critical approaches to Herbert's poetry and outlines the study. Chapter Two examines Herbert's life and the expression of his struggles in poetry. Chapter Three discusses Herbert's poetry itself and comments on the deceptively simplistic style. Chapter Four explores the conflict between the worlds of the Christian and the poet. Chapter Five concludes that, more than merely an artistic exercise or catechistic tool, Herbert's poetry accurately records the duality of the poet's spiritual journey.
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Performance of Adults with and without Attention-Deficit/Hyperactivity Disorder (ADHD) on Measures of Response Inhibition and Frontal Lobe Functioning

Performance of Adults with and without Attention-Deficit/Hyperactivity Disorder (ADHD) on Measures of Response Inhibition and Frontal Lobe Functioning

Date: August 2000
Creator: Wodushek, Thomas R.
Description: In this study 2 groups of adults, those with and without ADHD, were studied in terms of cognitive functioning and symptoms of ADHD, depression, anxiety, and substance abuse. Due to the difficulties in diagnosing ADHD in this population three methods of diagnosis were used and the resulting findings presented. The groups did not differ in measures of depression, anxiety, substance abuse or age. Those adults who met criteria for ADHD showed worse performance on a measure of response inhibition compared to those without ADHD. The patterns of correlations among the cognitive measures differed between the two groups. The conclusions from the findings are discussed in relation to Barkley's (1997) self-regulation model of ADHD.
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The performance of silicon based sensor and its application in silver toxicity studies

The performance of silicon based sensor and its application in silver toxicity studies

Date: August 2000
Creator: Peng, Haiqing
Description: The silicon based sensor is able to detect part per trillion ionic silver in 0.0098% hydrofluoric acid based on the open circuit potential (OCP) measurement. The OCP jump of 100 ppt ionic silver solution is up to 120 mV. The complex agent can effectively suppress the ionic silver concentration and suppress the OCP signal. The ability of complex agent to suppress the OCP signal depends on the formation constant of the complex with silver. The complex adsorbed on the sensor surface induces a second OCP jump, the height of the second jump depends on the formation constant of the complex. The MINEQL chemical equilibrium modeling program is used to calculate the ionic silver concentration when complex agent presents, a discrepancy is found between the MINEQL simulation result and the OCP signal of the silicon based sensor. The toxicity of ionic silver to C. dubia is studied parallel to the OCP signal of silicon based sensor. Less toxicity is found when the complex agent is present similar to the OCP signal. Another discrepancy is found between the MINEQL simulation and the toxicity test when MINEQL simulation is used to predict and control the ionic silver concentration. The data from both biosensor ...
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Personality Type Preferences of Juvenile Delinquents

Personality Type Preferences of Juvenile Delinquents

Date: August 2000
Creator: Cavin, Clark
Description: The purpose of this study was to identify and explore personality characteristics of juvenile delinquents, to compare those characteristics with those of the general population, and determine if there are significant differences, as measured by the Myers-Briggs Type Indicator (MBTI), between the personality characteristics of juvenile delinquents and the general population. Juvenile delinquents who were adjudicated into a Texas Youth Commission facility in North Texas were subjects for this study. Participants included 186 males who ranged in age from 14 years to 20 years. Statistical analyses were performed for each of the research questions. When comparing MBTI scores of juvenile delinquents to the general population, significant differences were found on the dichotomous scales, temperaments, function pairs, and types. All type preferences are represented within the juvenile delinquent population. The MBTI can be useful in responding to the education and rehabilitation needs of juvenile delinquents. Knowledge of personality type can help caregivers meet the needs of juvenile delinquents. Understanding personality type preference can serve to provide a deeper understanding of the behaviors that lead to adjudication of juvenile delinquents. A discovery of the types of adolescents who are adjudicated could lead to preventive measures, early detection, and early intervention for students ...
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Pre-Service Teachers' Attitudes Toward Language Diversity

Pre-Service Teachers' Attitudes Toward Language Diversity

Date: August 2000
Creator: Leek, Patricia A.
Description: This study examines pre-service teachers' attitudes toward language diversity and linguistically diverse students. Two hundred seventy-one teacher education students were surveyed to determine relative effects of demographic, mediating variables and psychosocial variables on language attitude as measured by the Language Attitudes of Teachers Scale (LATS). Independent variables include gender, age, race/ethnicity, teacher certification sought, region, psychological insecurity, cognitive sophistication, and helpfulness viewpoint. Research questions are established and methodology is outlined. A review of related literature places the study in the context of research with a broad interdisciplinary perspective and then links the study to other research relevant to the field of education. The findings of the study indicate that gender, race/ethnicity, teacher certification sought, political ideology, psychological insecurity, and cognitive sophistication contribute significantly to the variation found in attitude toward language diversity. The paper concludes with analyses and discussions of the significant variables and suggestions for application in teacher preparation.
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Prevalence of undiagnosed dissociative disorders in an inpatient setting

Prevalence of undiagnosed dissociative disorders in an inpatient setting

Access: Use of this item is restricted to the UNT Community.
Date: August 2000
Creator: Duffy, Colleen
Description: This study examined the prevalence of undiagnosed dissociative disorders in a sample of 201 adult patients admitted to a private psychiatric hospital in a major metropolitan city in the south-central United States, over an eight-month period. A screening measure, two blind structured interviews, and a blind clinical interview were employed. The lifetime prevalence of dissociate disorders among the interviewed subjects was 40.8%. More specifically, 7.5% were diagnosed with dissociative identity disorder, 15.4% with dissociative disorder not otherwise specified, 13.4% with dissociative amnesia, and 4.5% with depersonalization disorder. Dissociative fugue was not found in this sample. Cohen's kappa reliability coefficients were computed between the three interview measures, resulting in significant findings for the presence of dissociative identity disorder and dissociative disorder not otherwise specified versus no dissociative disorder. The Cohen's kappa reliability coefficients were as follows: DDIS-DES-T = 0.81; SCID-D-DES-T = 0.76; Clinician-DES-T = 0.74, DDIS-SCID-D = 0.74; DDIS-Clinician = 0.71, and SCID-D-Clinician = 0.56. A meeting was conducted at the end of all subject interviews to discuss discrepant findings between measures. Four additional sub-analyses were performed between dissociative and non-dissociative subjects on DSM-IV variables. Patients diagnosed with a dissociative disorder had higher rates of comorbid major depressive disorder, borderline personality ...
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Production and characterization of a novel extracellular polysaccharide produced by Paenibacillus velaei, sp. nov

Production and characterization of a novel extracellular polysaccharide produced by Paenibacillus velaei, sp. nov

Access: Use of this item is restricted to the UNT Community.
Date: August 2000
Creator: Sukplang, Patamaporn
Description: Paenibacillus velaei, sp. nov. is a soil bacterium capable of producing an unusually large amount of exopolysaccharide (EPS). The EPS contains glucose, mannose, galactose and fucose in a molar ratio of 4:2:1:1. The molecular weight of the EPS is higher than 2x106. The viscosity of 1% EPS is 1300 cP when measured at a shear rate of 1 sec-1. Physiological parameters for optimal production of the EPS were studied and it was found that 1.4 g dry weight per 1 l of medium was produced when the bacteria were grown at 30EC and the pH adjusted at 7± 0.2 in a medium containing glucose as the carbon source. Growing the bacteria on different carbon sources did not alter the quantity or the composition of the EPS produced. No toxicity effects were observed in mice or rats when EPS was administered in amounts ranging from 20 to 200 mg per kg body weight. The data obtained from physical, chemical and biological properties suggest that the EPS may be employed in several industrial and environmental applications. It is an excellent emulsifier, it holds 100 times its own weight in water, it is not toxic, and it can be used to remove mercury, ...
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Psychological and Sociodemographic Predictors of Psychological Distress in BRCA1 and BRCA2 Genetic Testing Participants within a Community Based Genetic Screening Program

Psychological and Sociodemographic Predictors of Psychological Distress in BRCA1 and BRCA2 Genetic Testing Participants within a Community Based Genetic Screening Program

Access: Use of this item is restricted to the UNT Community.
Date: August 2000
Creator: Lesniak, Karen
Description: Mutations in BRCA1 and BRCA2, the first two breast cancer susceptibility genes identified, carry as much as an 85% lifetime risk of developing breast, ovarian or other cancers. Genetic testing for mutations in these two genes has recently become commercially available. There have been varying amounts of psychological distress noted among women with a family history of breast cancer. Distress has been observed to impact psychological functioning, activities of daily living, and the practice of breast cancer surveillance behaviors. Within the genetic screening process, psychological distress has been shown to impact the decision to undergo genetic screening, the comprehension and retention of risk assessment information, as well as affecting the subject following the receipt of the genetic test results. Little work has been done to examine predictors of distress within at risk subjects. This study examines psychological distress among 52 community women presenting for BRCA1 and BRCA2 genetic mutation testing. Predictors of distress included family cancer history, education, age, Ashkenazi ethnicity, and Internality and Powerful Others Health Locus of Control. Vulnerable sub-groups of patients include younger women, women with higher levels of education and women of Ashkenazi ethnicity.
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Questioning Voices: Dissention and Dialogue in the Poetry of Emily and Anne Brontë

Questioning Voices: Dissention and Dialogue in the Poetry of Emily and Anne Brontë

Date: August 2000
Creator: Kalkwarf, Tracy Lin
Description: My dissertation examines the roles of Emily and Anne Brontë as nineteenth-century women poets, composing in a literary form dominated by androcentric language and metaphor. The work of Mikhail Bakhtin, particularly concerning spoken and implied dialogue, and feminists who have pioneered an exploration of feminist dialogics provide crucial tools for examining the importance and uses of the dialogic form in the development of a powerful and creative feminine voice. As such, I propose to view Emily's Gondal poetry not as a series of loosely connected monologues, but as utterances in an inner dialogue between the dissenting and insistent female voice and the authoritative voice of the non-Gondal world. Emily's identification with her primary heroine, Augusta, enables her to challenge the controlling voice of the of the patriarchy that attempts to dictate and limit her creative and personal expression. The voice of Augusta in particular expresses the guilt, shame, and remorse that the woman-as-author must also experience when attempting to do battle with the patriarchy that attempts to restrict and reshape her utterances. While Anne was a part of the creation of Gondal, using it to mask her emotions through sustained dialogue with those who enabled and inspired such feelings, her ...
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