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Results 5431 - 5440 of 11,049
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Regulatory Divergence of Aspartate Transcarbamoylase from the Pseudomonads

Regulatory Divergence of Aspartate Transcarbamoylase from the Pseudomonads

Date: December 1996
Creator: Linscott, Andrea J. (Andrea Jane)
Description: Aspartate transcarbamoylase (ATCase) was purified from 16 selected bacterial species including existing Pseudomonas species and former species reassigned to new genera. An enormous diversity was seen among the 16 enzymes with each class of ATCase being represented. The smallest class, class C, with a catalytically active homotrimer, at 100 kDa, was found in Bacillus and other Gram positive bacteria. In this report, the ATCases from the Gram negatives, Shewanella putrefaciens and Stenotrophomonas maltophilia were added to class C membership. The enteric bacteria typify class B ATCases at 310 kDa, with a dodecameric structure composed of two catalytic trimers coupled to three regulatory dimers. A key feature of class B ATCases is the dissociability of the holoenzyme into regulatory and catalytic subunits which were enzymatically active. In this report, the ATCase from Pseudomonas indigofera was added to class B ATCases. The largest class, at 480 kDa, class A, contains the fluorescent Pseudomonas including most members of the 16S rRNA homology group I. Two polypeptides are produced from overlapping pyrBC' genes. The former, pyrB, encodes a 34 kDa catalytic polypeptide while pyrC' encodes a 45 kDa dihydroorotase-like polypeptide. Two non active trimers are made from six 34 kDa chains which are cemented ...
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The Relationship Between Abilities and Perceived Everyday Intelligence in Older Adults

The Relationship Between Abilities and Perceived Everyday Intelligence in Older Adults

Date: December 1996
Creator: Patterson, Marla K. (Marla Kay)
Description: This study examined the relationship between perceptions of intellectual functioning and measures of cognitive abilities, personality variables and sociodemographic information. One hundred and fifty-two older community residing adults were asked to define their perception of intelligence by completing a questionnaire that asked the extent to which a variety of tasks are: functionally important, contribute to feelings of intellectual vitality and are the object of worry or concern. They also estimated their skill at performing each task. The hypothesis that cognitive abilities would best predict perceptions of cognitive functioning was moderately supported. Personality variables, specifically anxiety, were more predictive of the meaning variables than abilities.
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Robustness of the One-Sample Kolmogorov Test to Sampling from a Finite Discrete Population

Robustness of the One-Sample Kolmogorov Test to Sampling from a Finite Discrete Population

Date: December 1996
Creator: Tucker, Joanne M. (Joanne Morris)
Description: One of the most useful and best known goodness of fit test is the Kolmogorov one-sample test. The assumptions for the Kolmogorov (one-sample test) test are: 1. A random sample; 2. A continuous random variable; 3. F(x) is a completely specified hypothesized cumulative distribution function. The Kolmogorov one-sample test has a wide range of applications. Knowing the effect fromusing the test when an assumption is not met is of practical importance. The purpose of this research is to analyze the robustness of the Kolmogorov one-sample test to sampling from a finite discrete distribution. The standard tables for the Kolmogorov test are derived based on sampling from a theoretical continuous distribution. As such, the theoretical distribution is infinite. The standard tables do not include a method or adjustment factor to estimate the effect on table values for statistical experiments where the sample stems from a finite discrete distribution without replacement. This research provides an extension of the Kolmogorov test when the hypothesized distribution function is finite and discrete, and the sampling distribution is based on sampling without replacement. An investigative study has been conducted to explore possible tendencies and relationships in the distribution of Dn when sampling with and without replacement ...
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Rural Shared Service Arrangements: An Analysis of Perceived Responsibilities / Roles With and Without Site-Based Decision-Making

Rural Shared Service Arrangements: An Analysis of Perceived Responsibilities / Roles With and Without Site-Based Decision-Making

Date: December 1996
Creator: Mullins, Frank E. (Frank Edward)
Description: This study examined the perceptions of school superintendents of districts and building principals of schools within selected shared service arrangements in the state of Texas who receive services from the cooperative, and selected directors of rural shared service arrangements pertaining to the responsibilities and roles of shared service arrangements when site-based decision-making (SBDM) was used as the guiding philosophy.
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The Songs of Sidney Homer, with Three Recitals of Selected Works by Verdi, Handel, Brahms, Poulenc, Ives, Loewe, Fauré, Floyd and Others

The Songs of Sidney Homer, with Three Recitals of Selected Works by Verdi, Handel, Brahms, Poulenc, Ives, Loewe, Fauré, Floyd and Others

Date: December 1996
Creator: Snider, Jeffrey
Description: Now all but forgotten, the songs of Sidney Homer (1864-1953) were at one time well-regarded and often performed. Married to the great American contralto Louise Homer, he was in a unique position to have his songs performed by the great artists of the time. Unlike the cloying "parlor songs" of many of his contemporaries, his works consistently demonstrate a respect for both the great poets as well as the European art-song tradition. One of the most cosmopolitan of the American composers of his day, his involvement with Louise's career brought him into contact with many of the great composers and performers of the day including Massenet, Puccini, Humperdinck, Mahler, Toscanini and Caruso. When viewed in their entirety, his songs reveal not only a tremendous variety, but also the maturation of his compositional style.
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Strategic Planning: Process and Evaluation

Strategic Planning: Process and Evaluation

Date: December 1996
Creator: Gehrking, Gene C. (Gene Clarence)
Description: Strategic planning practices and superintendents' opinions regarding the effectiveness of strategic planning are different among small, medium, and large Texas independent school districts. This study sought to find areas of agreement and areas of disagreement among school district superintendents relating to the practice and effectiveness of strategic planning. Strategic planning practices examined include the development of a mission statement, operating plan, and budget; involvement of stakeholders, and strategic planning logistics. A stratified random sample of 96 superintendents each from small, medium, and large school districts was selected from a population of 1,042 school districts. Data was also collected and reported from the 7 mega school districts. Questionnaires were sent to 295 superintendents and 246 (83.4%) were returned. The questionnaire contained nine questions relating to 19 strategic planning practices and a five-part question relating to the effectiveness of strategic planning. The data was analyzed using Crosstabs, Chi-square, and one-way ANOVA statistics. The level of significance was established a priori at .05. School district size was an independent variable for six strategic planning practices of small, medium, and large school districts. Significant differences were found regarding (a) whether outside consultants were employed to assist with the district's strategic planning, (b) whether central ...
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Student Legal Issues Confronting Metropolitan Institutions of Higher Education

Student Legal Issues Confronting Metropolitan Institutions of Higher Education

Date: December 1996
Creator: Elleven, Russell K. (Russell Keith)
Description: This study examined perceptions of student legal issues confronting metropolitan institutions of higher education. The data for the study were collected using a modified version of Bishop's (1993) legal survey. The sample for the study consisted of 44 chief student affairs officers and 44 chief legal affairs officers employed with the 44 institutions affiliated with the Coalition of Urban and Metropolitan Universities. Frequency counts and percentage distributions were employed to analyze the data. Chief student affairs officers and chief legal affairs officers have very different perception as to the most likely student legal issues to be litigated in the next ten years. Chief student affairs officers found few student legal issues highly likely to be litigated in the next 10 years. Affirmative action, sex/age discrimination, fraternities and sororities, and disabled students were the only student legal issues at least 20 percent of chief student affairs officers believed to be highly likely of litigation in the next ten years. Chief legal affairs officers believed many student legal issues would be litigated in the next 10 years. At least 20 percent of the chief legal affairs officers believed admission criteria, affirmative action, reverse discrimination, sex/age discrimination, athletic tort liability, Title IX, defaulting ...
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A Study of Intensity Control in Males with Developing Voices: Implications for Pitch Range and Tessitura

A Study of Intensity Control in Males with Developing Voices: Implications for Pitch Range and Tessitura

Date: December 1996
Creator: Harris, Lee Davis
Description: Research on voice change in males has generally fallen into two categories: music education studies of changes in the singing voice and speech studies of changes in the speaking voice. These studies rarely consider differences in the dynamic ability of male singers at different stages of vocal development. The concept of tessitura, a portion of the vocal range in which the singer sounds best, is referred to in the literature on vocal music, but the means for identifying its size and location within the range have not been consistently specified. Tessitura appears to be a portion of the range which is most controllable in terms of dynamics and agility and is optimal in tonal quality. This study used the phonetograph to investigate differences in measures of intensity control between pre-pubertal, pubertal (changing) and post-pubertal voices in 48 males aged 9 to 18 years old. These intensity measures were compared to ratings of vocal effort from a panel of 4 music educators in order to determine if tessitura could be identified from acoustic and perceptual evidence of an optimum vocal area. Results of the study were: 1) post-pubertal voices demonstrated greater control of vocal intensity as revealed in lower mean minimum ...
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A Study of Nonlinear Dynamics in an Internal Water Wave Field in a Deep Ocean

A Study of Nonlinear Dynamics in an Internal Water Wave Field in a Deep Ocean

Date: December 1996
Creator: Kim, Won-Gyu, 1962-
Description: The Hamiltonian of a stably stratified incompressible fluid in an internal water wave in a deep ocean is constructed. Studying the ocean internal wave field with its full dynamics is formidable (or unsolvable) so we consider a test-wave Hamiltonian to study the dynamical and statistical properties of the internal water wave field in a deep ocean. Chaos is present in the internal test-wave dynamics using actual coupling coefficients. Moreover, there exists a certain separatrix net that fills the phase space and is covered by a thin stochastic layer for a two-triad pure resonant interaction. The stochastic web implies the existence of diffusion of the Arnold type for the minimum dimension of a non-integrable autonomous system. For non-resonant case, stochastic layer is formed where the separatrix from KAM theory is disrupted. However, the stochasticity does not increase monotonically with increasing energy. Also, the problem of relaxation process is studied via microscopic Hamiltonian model of the test-wave interacting nonlinearly with ambient waves. Using the Mori projection technique, the projected trajectory of the test-wave is transformed to a form which corresponds to a generalized Langevin equation. The mean action of the test-wave grows ballistically for a short time regime, and quenches back to ...
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A Study of Some Biological Effects of Non-Ionizing Electromagnetic Radiation

A Study of Some Biological Effects of Non-Ionizing Electromagnetic Radiation

Date: December 1996
Creator: Park, Young C. (Young Chul), 1960-
Description: The experimental studies of this work were done using a microwave cavity spectrometer, Escherichia coli (E-coli) bacteria, and other peripheral equipment. The experiment consists of two steps. First, a general survey of frequencies from 8 GHz to 12 GHz was made. Second, a detailed experiment for specific frequencies selected from the first survey were further studied. Interesting frequency dependent results, such as unusually higher growing or killing rates of E-coli at some frequencies, were found. It is also concluded that some results are genetic, that is, the 2nd, and 3rd subcultures showed the same growing status as the 1st cultures.
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