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.

Asparate transcarbamoylase catalyzes the first committed step in the de novo synthesis of pyrmidine nucleotides UMP, UDP, UTP, and CTP. The archetype enzyme found in Escherichia coli (310 kDa) exhibits sigmodial substrate binding kinetics with positive control by ATP and negative control with CTP and UTP. The ATCase characterized in this study is from the extreme thermophilic Archaebacterium, Methanococcus jannaschii. The enzyme was very stable at elevated temperatures and possessed activity from 20 degrees Celsius to 90 degrees Celsius. M. Jannaschii ATCase retained 75% of its activity after incubation at 100 degrees Celsius for a period of 90 minutes. No sigmodial allosteric response to substrate for the enzyme was observed. Velocity substrate plots gave Michaelis-Menten (hyperbolic) kinetics. The Km for aspartate was 7 mM at 30 degrees Celsius and the KM for carbamoylphosphate was .125 mM. The enzyme from M. jannaschii had a broad pH response with an optimum above pH 9. Kinetic measurements were significantly affected by changes in pH and temperature. The enzyme catalyzed reaction had an energy of activation of 10,300 calories per mole. ATCase from M. jannaschii was partially purified. The enzyme was shown to have a molecular weight of 110,000 Da., with a subunit molecular …

This study is a historical analysis of the significant events that led to the creation and evolution of the Texas Academy of Mathematics and Science (TAMS), from 1987 through 1992, and a description of the key individuals contributing to the development of the program. Included is a historical review of early college entrance and acceleration practices in the American educational system. In addition, the development of residential programs for mathematically and scientifically precocious high school-aged youths is offered. On June 23, 1987, the Texas Academy of Mathematics and Science was established by the 70th Texas Legislature. Though fourth in a line of special programs created for mathematically and scientifically able high school-aged youths, the TAMS model significantly deviated from its predecessors. Only the accelerative TAMS model would offer a college curriculum taught by college faculty and the opportunity to concurrently complete the last two years of high school and the first two years of college. From the inception of the program in 1987 through 1992, changes would occur. From 1987 through the summer of 1988, the development of the curriculum, student life program, and admissions process took place. From 1988 through 1989 the inaugural class was introduced to the program, …

The treatment of alcoholism has had a unique historical development in the United States. This study provides a chronology of how the problem of alcoholism was defined and handled during various time periods in United States history. The process that evolved resulted in an abstinence based, comprehensive, multidisciplinary approach to the treatment of alcoholism as a primary disease based on the principles of Alcoholics Anonymous. This treatment modality, that developed outside of established medicine, is currently used by the majority of treatment providers. Seven individuals who have been actively involved in alcoholism treatment were interviewed. In addition to archival research, biographies and autobiographies were examined to gain a broad perspective. Because alcoholism is both a collective and an individual problem an effort was made to include a microsociological frame of reference within a broad sociological view. Alcoholism, or inebriety, was first perceived as a legal and moral problem. By the end of the 19th century, inebriety was recognized as an illness differing from mental illness, and separate asylums were established for its treatment. Alcoholism is currently accepted and treated as a primary disease by the majority of social institutions, but the legal and moral implications remain. National Prohibition in the …

We address the problem of the DNA sequences developing a "dynamical" method based on the assumption that the statistical properties of DNA paths are determined by the joint action of two processes, one deterministic, with long-range correlations, and the other random and delta correlated. The generator of the deterministic evolution is a nonlinear map, belonging to a class of maps recently tailored to mimic the processes of weak chaos responsible for the birth of anomalous diffusion. It is assumed that the deterministic process corresponds to unknown biological rules which determine the DNA path, whereas the noise mimics the influence of an infinite-dimensional environment on the biological process under study. We prove that the resulting diffusion process, if the effect of the random process is neglected, is an a-stable Levy process with 1 < a < 2. We also show that, if the diffusion process is determined by the joint action of the deterministic and the random process, the correlation effects of the "deterministic dynamics" are cancelled on the short-range scale, but show up in the long-range one. We denote our prescription to generate statistical sequences as the Copying Mistake Map (CMM). We carry out our analysis of several DNA sequences, …

In 1992, the state of Texas awarded a number of inducement grants to collaboratives of universities, schools, and service centers to develop field-based professional development schools (PDSs) and provide preservice and inservice teachers with extensive professional development. This study investigated the design and effects of the professional development models in these Texas Centers for Professional Development and Technology (CPDTs). This study used qualitative data collection and analysis procedures. Raw data were collected in the form of individual interviews, focus group interviews, documentation, and fieldnotes. Forty-six interviews were completed involving a total of 83 respondents representing all partnering entities: university representatives, school representatives, education service center representatives, and policymakers. Documentation included annual and quarterly reports, grant applications, and program approval requests. Fieldnotes included observational data from site visits. Data analysis was an iterative process using a constant comparative analysis of coded categories emerging fromtranscribed data. This comparison examined: the vision of professional development as perceived by the respondents, the enactment of professional development as experienced by the respondents, and the effects that the CPDT initiative had on professional development as perceived by the respondents. This study revealed 18 themes that were common across all eight Texas CPDTs. The themes revealed patterns …