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Investigation of Novel Electrochemical Synthesis of Bioapatites and Use in Elemental Bone Analysis

Investigation of Novel Electrochemical Synthesis of Bioapatites and Use in Elemental Bone Analysis

Access: Use of this item is restricted to the UNT Community.
Date: December 2012
Creator: DeLeon, Vallerie H.
Description: In this research, electrochemical methods are used to synthesize the inorganic fraction of bone, hydroxyapatite, for application in biological implants and as a calibration material for elemental analysis in human bone. Optimal conditions of electrochemically deposited uniform apatite coatings on stainless steel were investigated. Apatite is a ceramic with many different phases and compositions that have beneficial characteristics for biomedical applications. Of those phases hydroxyapatite (HA) is the most biocompatible and is the primary constituent of the inorganic material in bones. HA coatings on metals and metal alloys have the ability to bridge the growth between human tissues and implant interface, where the metal provides the strength and HA provides the needed bioactivity. The calcium apatites were electrochemically deposited using a modified simulated body fluid adjusted to pH 4-10, for 1-3 hours at varying temperature of 25-65°C while maintaining cathodic potentials of -1.0 to -1.5V. It was observed that the composition and morphology of HA coatings change during deposition by the concentration of counter ions in solution, pH, temperature, applied potential, and post-sintering. The coatings were characterized by powder x-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy. The precipitated powders from the experiment were also characterized, with results ...
Contributing Partner: UNT Libraries
An Investigation of Organizational Communication and Its Relationship to Two Organizational Models Involving Job Performance and Job Satisfaction

An Investigation of Organizational Communication and Its Relationship to Two Organizational Models Involving Job Performance and Job Satisfaction

Date: August 1985
Creator: Goris, Jose R.
Description: None
Contributing Partner: UNT Libraries
An Investigation of Perception of a Frequency Modulated Band Location of Pitch Within a Musical Vibrato

An Investigation of Perception of a Frequency Modulated Band Location of Pitch Within a Musical Vibrato

Date: May 1986
Creator: Brown, Steven Franklin
Description: None
Contributing Partner: UNT Libraries
An Investigation of Personal Investment Levels Among Nonmusic Major Piano Students Using Portfolio Assessment

An Investigation of Personal Investment Levels Among Nonmusic Major Piano Students Using Portfolio Assessment

Date: May 1998
Creator: Heisler, Paul K.
Description: The purpose of this study was to compare personal investment levels among nonmusic major piano students in the contexts of portfolio and teacher-directed assessment. Three problems were addressed: 1) identifying students' perceptions of direction, persistence, continuing motivation, intensity, and performance in the context of teacher-directed goal setting, choice of instructional activities, and evaluation of performance; 2) identifying students' perceptions of the five personal investment behaviors in the context of portfolio assessment; and 3) comparing student perceptions as identified in problems one and two.
Contributing Partner: UNT Libraries
An Investigation of Personality Characteristics of Bulimic Women Late Adolescent Through Adult Ages in the Dallas/Fort Worth Metroplex

An Investigation of Personality Characteristics of Bulimic Women Late Adolescent Through Adult Ages in the Dallas/Fort Worth Metroplex

Date: December 1983
Creator: Trevino, Ana Maria
Description: None
Contributing Partner: UNT Libraries
An Investigation of Points About the Circle of Convergence

An Investigation of Points About the Circle of Convergence

Date: 1958
Creator: Gray, Brucy Clothus
Description: This paper will be concerned with the convergence of complex power series.
Contributing Partner: UNT Libraries
An Investigation of Preadolescent Children's Attitudes toward Television Commercials

An Investigation of Preadolescent Children's Attitudes toward Television Commercials

Date: August 1973
Creator: Ferguson, Clara Potter
Description: The purpose of this research study is to provide commercial advertisers, television networks, and academicians valuable information regarding the existence, direction, and intensity of preadolescent children's attitudes toward television commercials.
Contributing Partner: UNT Libraries
An Investigation of Principal's Leadership Behavior as Perceived by Secondary School Principals and Teachers in Nakorn Pathom, Thailand

An Investigation of Principal's Leadership Behavior as Perceived by Secondary School Principals and Teachers in Nakorn Pathom, Thailand

Date: August 1980
Creator: Sukhabanij, Sariya
Description: None
Contributing Partner: UNT Libraries
An investigation of prior learning assessment processes in Texas public universities offering nontraditional baccalaureate degrees.

An investigation of prior learning assessment processes in Texas public universities offering nontraditional baccalaureate degrees.

Date: May 2006
Creator: Freed, Rusty
Description: Undergraduate enrollment in colleges and universities has grown and changed drastically over the past 2 decades, with a significant portion of this growth coming from the increased number of nontraditional students who have made the decision to make their way onto college and university campuses to pursue a college degree. Due to these changes, many institutions of higher education have had to rethink the way they have historically operated. In an attempt to better meet the needs and demands of adult nontraditional students, colleges and universities have reviewed their existing programs and instituted programs that allow for the awarding of academic credit for prior learning. For those institutions of higher education involved in the prior learning assessment (PLA) process and interested in providing a quality program, an increased emphasis and focus should be on the importance of determining what a learning activity is, and more importantly, what constitutes college-level learning. This study focused on the identification and profiling of prior learning assessment (PLA) processes in Texas public universities offering nontraditional baccalaureate degree programs, the identification of commonalties among such programs, and the determination of program quality based on established standards. The instrument utilized in this study was designed on Urban ...
Contributing Partner: UNT Libraries
An Investigation of Psychopathy in a Female Jail Sample: a Study of Convergent and Discriminant Validity

An Investigation of Psychopathy in a Female Jail Sample: a Study of Convergent and Discriminant Validity

Date: May 1996
Creator: Salekin, Randall T. (Randall Todd)
Description: The present study was designed to assess both the construct of psychopathy in a female jail sample as well as the quality of the measures that have been employed to assess this personality style. Utilizing the multitrait-multimethod matrix proposed by Campbell and Fiske (1959), the construct of psychopathy was measured via three instruments: (a) the Antisocial Scale of the Personality Assessment Inventory, (b) the Psychopathy Checklist - Revised, and (c) the Antisocial Scale of the Personality Disorder Examination. In addition, the predictive validity of each of these measures of psychopathy was evaluated to determine their ability to predict institutional violence and non-compliance. The results revealed significant convergence and divergence across the three instruments supporting the construct of psychopathy in a female jail sample. In addition, the measures of psychopathy demonstrated moderate predictive validity.
Contributing Partner: UNT Libraries