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 Collection: UNT Theses and Dissertations
Investigation of cryopreservation methods for adherent nerve cell networks in vitro.

Investigation of cryopreservation methods for adherent nerve cell networks in vitro.

Date: December 2009
Creator: Webb, Veronica Fine
Description: Cryopreservation in suspension is commonplace for a variety of cell types. However, cryopreservation of adherent cells has achieved limited success. This research aimed to cryopreserve adherent nerve cell networks in vitro in a manner that preserved network morphology and physiology. Successful implementation would enable long term storage of adherent neuronal networks on microelectrode arrays and on-demand access for use in pharmacological and toxicological testing. Based upon morphological assessments, excellent post-thaw preservation was obtained and post-thaw cultures survived in a transitional medium for up to 3.5 hours. However, transitions to native culture medium post-thaw presented difficulties, ultimately resulting in necrosis. A discussion of methods to supplement the current research and increase post-thaw viability is included in the thesis.
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An investigation of factors affecting Omani faculty members' adoption of information and computing technology.

An investigation of factors affecting Omani faculty members' adoption of information and computing technology.

Date: August 2009
Creator: Al Senaidi, Said
Description: The purpose of this study was to explore the factors influencing information and computing technology (ICT) adoption for Omani faculty members from a framework of Rogers' theory of diffusion of innovation. Three hundred Omani faculty members from Sultan Qaboos University (SQU) participated in the study. The survey consisted of five parts: (a) an 18-item questionnaire on ICT uses and skills, (b) a 1-item questionnaire on adopter category, (c) a 44-item self-constructed questionnaire on perception of barriers to adopting ICT, (d) a 50-item questionnaire on ICT attributes adapted from Moore and Benbasat, and (e) a 15-item questionnaire on demographic and job-related variables. Descriptive statistics indicated that the faculty members overall used ICT at the "Sometimes" level and had ICT skills at the "Intermediate" level. The most frequently used and skillful ICT functional areas were Website browsing, Internet search engine, and word processing. One-way ANOVAs found significant group differences of ICT uses and skills, perception of barriers, and perception of ICT attributes in the category of adopter. Early adopters used ICT more, had higher ICT skills, perceived fewer barriers in the adopting process, and recognized higher values of ICT attributes than later adopters did. Multiple regression analysis showed the level of ICT ...
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An Investigation of Factors Affecting Test Equating in Latent Trait Theory

An Investigation of Factors Affecting Test Equating in Latent Trait Theory

Date: August 1998
Creator: Suanthong, Surintorn
Description: The study investigated five factors which can affect the equating of scores from two tests onto a common score scale. The five factors studied were: (a) distribution type (i.e., normal versus uniform); (b) standard deviation of itemdifficulties (i.e., .68, .95, .99); (c) test length or number of test items (i.e., 50,100, 200); (d) number of common items (i.e., 10,20,30); and (e) sample size (i.e., 100, 300, 500). The significant two-way interaction effects were for common item length and test length, standard deviation of item difficulties and distribution type, and standard deviation of item difficulties and sample size.
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An Investigation of Factors Influencing the User's Social Network Site Continuance Intention

An Investigation of Factors Influencing the User's Social Network Site Continuance Intention

Date: December 2012
Creator: Han, Bo
Description: The social network sites (SNS) industry has recently shown an abnormal development pattern: An SNS could rapidly accumulate a large number of users, and then suffer a serious loss of users in a short time, which subsequently leads to the failure of the Web site in the highly competitive market. The user's social network site continuance is considered the most important factor for an SNS to keep its sustainable development. However, little knowledge of the user's SNS continuance raises the following research question: What factors could significantly influence the user's SNS continuance intention? To address this research question, I study the question from three lenses of research, including the I-view, the social interactivity view, and the trust based view. The I-view is an extension of the IS continuance model. From this research perspective, I tested the influence of the utilitarian factor (i.e., perceived usefulness) and the hedonic factor (i.e., perceived enjoyment) on the user's satisfaction in the I-view. In addition, I extend the umbrella construct, confirmation, into two sub-constructs, informativeness and self-actualization, and respectively study their influences on the utilitarian factor and the hedonic factor. I find that the user's perceived enjoyment has a significant positive effect on the user's ...
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An Investigation of Gas Chromatographic Separation of Tastes and Odors Produced by Actinomycetes

An Investigation of Gas Chromatographic Separation of Tastes and Odors Produced by Actinomycetes

Date: January 1965
Creator: Matlock, James K.
Description: It is the purpose of this thesis to evaluate a few selected gas chromatographic materials for the separation of odorants produced by an actinomycete culture under laboratory conditions. Also to compare the results obtained with concentrated solutions of a surface water containing similar odors under natural conditions.
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An Investigation of Graham High School Graduates to Determine Whether They are Meeting Stated Needs of Business as to Personality, Intelligence, and Character Traits

An Investigation of Graham High School Graduates to Determine Whether They are Meeting Stated Needs of Business as to Personality, Intelligence, and Character Traits

Date: 1949
Creator: Mayes, Billy Woods
Description: It was the purpose of this study to make an investigation of fifty-seven representative businesses that are located throughout the United States, in an attempt to find out just what the potential employers feel the school should give the potential employee in regard to personality and character training.
Contributing Partner: UNT Libraries
Investigation of growth kinetics of self-assembling monolayers by means of contact angle, optical ellipsometry, angle-resolved XPS and IR spectroscopy.

Investigation of growth kinetics of self-assembling monolayers by means of contact angle, optical ellipsometry, angle-resolved XPS and IR spectroscopy.

Date: August 2004
Creator: Jakubowicz, Agnieszka
Description: Absorption of octadecanethiol and p-nitrobenzenethiol onto gold surfaces from ethanol solutions has been studied by means of contact angle, optical ellipsometry, angle-resolved XPS (ARXPS), and with grazing angle total reflection FTIR. Growth of the monolayers from dilute solutions has been monitored and Langmuir isotherm adsorption curves were fitted to experimental data. A saturated film is formed within approximately 5h after immersion in solutions of concentrations ranging from 0.0005mM to 0.01mM. We found, that the final density of monolayer depends on the concentration of the solution.
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An Investigation of Heart Response During Trumpet Playing

An Investigation of Heart Response During Trumpet Playing

Date: December 1993
Creator: Hunsaker, Leigh Anne
Description: The purpose of this study was to investigate the effects of trumpet playing upon the heart. A Holter monitor was used to record electrocardiograms (ECGs) to examine the heart's response during musical performances and practice sessions.
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An Investigation of I.Q. and Achievement Score Increase in Classes for the Emotionally Disturbed and Minimally Brain Injured as a Result of Operant Conditions Using Tangible Reinforcers

An Investigation of I.Q. and Achievement Score Increase in Classes for the Emotionally Disturbed and Minimally Brain Injured as a Result of Operant Conditions Using Tangible Reinforcers

Date: August 1973
Creator: Cooksey, James Roy
Description: This study was an objective investigation of an operant program in behavior modification using tangible reinforoers, which was conducted in two Special Education classes in the Denton Independent School District.
Contributing Partner: UNT Libraries
Investigation of Lead Hydrolytic Polymerization and Interactions with Organic Ligands in the Soil/Sediment-Water Environment

Investigation of Lead Hydrolytic Polymerization and Interactions with Organic Ligands in the Soil/Sediment-Water Environment

Date: December 2002
Creator: Sanmanee, Natdhera
Description: The objective of this research was to investigate lead speciation in the soil/sediment-water environment and to better understand how the species affect lead mobility under different environmental conditions. The research involved both field soil and sediment samples as well as standard lead solutions. Field samples were fully characterized and extracted by aqueous and organic solvents. The results were compared and evaluated with the metal speciation model, MINTEQA2. Hydrolytic polymerization and organic complexation studies were conducted with standard lead solutions under controlled experimental conditions. Results of the field samples showed that pH, dissolved cations, ionic strength, dissolved organic matter, and nature of the soil/sediment matrix play major roles in the distribution and mobility of lead (Pb) from contaminated sites. In the aqueous equilibration experiment, the magnitude of Pb2+ solubilization was in the order of pH4>pH7>pH9. The results were in good agreement with MINTEQA2 predictions. An important finding of the research is the detection of Pb polymerization species under controlled experimental conditions. At pH 5.22, Pb polymeric species were formed at rate of 0.03 per day. The role of Pb complexation with organic matter was evaluated in both field and standard samples. Different methodologies showed three types of organically bound Pb. A ...
Contributing Partner: UNT Libraries