The rigid peptidoglycan layer of the cell wall is responsible for maintaining the structural integrity of bacteria. Antibiotics such as penicillin exert their anti-bacterial effect by inhibiting synthesis of peptodoglycan, and enzymes such as lysozyme destroy cell integrity by hydrolyzing specific bonds in the interior of this macromolecule. Defective cells can no longer withstand the high turgor pressure within the cell because they are no longer protected by a rigid wall and tend to become fragile and spherical or irregular in shape. While all bacteria are pleomorphic under certain conditions which do not normally affect other bacteria. This is exemplified by the pleomorphic growth of Azotobacter in nutrient agar or peptone-containing medium. The purpose of this investigation was to study the nature of peptone-induced pleomorphism of Azotobacter. The first phase of study dealt with the effects of poptone on the growth and morphology of A. vinelandii. Many diverse froms were observed in peptone-containing media, but it was shown that all cell types were related to the "fungoid" family of pleomorphic cells. Although Azotobacter failed to accumulate detectable levels of cell-wall precursors in response to glycine treatment, it was shown that glycine acted only on metabolically active cells. In addition, incorporation …

The linkage relationship and arm location of the gene for greenbug resistance in the variety Will was determined by using primary trisonomics and tertiary trisomic homozygous translocations. The gene for greenbug resistance was found to be on linkage group 1 by using primary trisonomics. The gene was located on the cetromere segment of the Tl-6a translocation by using a tertiary trismoic homozygous for greenbug resistance. The data further substantiates the feasibility of using trisomics in placing genes on proper linkage groups.

This study investigates an application of hypnotic audiotapes to a specific group of college freshmen. Hypnotherapy is recognized as a viable adjunct to counseling, and it is known that hypnosis is possible via audiotapes. The study examines the use of hypnotic audiotapes designed to affect study habits and attitudes.

In contrast to the relatively rapid changes occurring in the modern American army, the period between the end of the War of 1812 and the beginning of the Mexican War offers a definite period for a study of military life when reform came slowly.

The problem with which this study is concerned is the separation of rehabilitation from production costs in vocational rehabilitation workshops. The problem exists within production operations of workshops where production and rehabilitation efforts are intertwined and the two kinds of costs are incurred simultaneously.

The problem with which this investigation is concerned is that of providing a current academic and racial description of the intercollegiate football participants at North Texas State University and the construction of a current participants' profile. The subjects employed were 259 football participants from the 1966 Fall Semester through the 1971 Fall Semester, The descriptive analysis is based upon 234 participants; the profile is a composite of eighty-one currently (1971) enrolled participants, This study has a twofold purpose, The first is to provide a current description of the academic status of both white and non-white participants; the second is to construct a current profile of the participants, The study is designed with the idea that the findings could be of use to coaches and administrators of this university in football programming, Transcripts, coaches, and the Public Information Office of this university provided the data used in the descriptive analysis, Eighty-one participants answering self-report questionnaires provided data for the profile,

The purpose of this study was to develop a probabilistic model that could be used by petroleum refiners to evaluate the economic potential of refinery capital investment proposals. The following two requirements were placed on the development at the outset: (1) that the model use linear programming to simulate refinery operations; and (2) that the model keep computer time within reasonable bounds. A probabilistic model was developed that requires the following steps for its application: (1) use linear programming to simulate both the operations of the existing refinery and the operations assuming that the investment is made; (2) select two variables that can be treated as probabilistic variables and assign either a theoretical or a subjective probability distribution to represent future values for the two variables; (3) develop return on investment interpolation data by computing a return on investment for all pair combinations of three tenth year values for each of the two probabilistic variables; (4) develop a return on investment distribution by selecting values at random from the two probability distributions and interpolating among the interpolation data to obtain return on investment data; (5) interpret the return on investment distribution. The model was applied to an actual refining situation …

The problem of this study is that of comparing certain physical fitness and anthropometric measures for early adolescent Mexican-American and Anglo-American males. The purposes of the study are to determine if Mexican-American and Anglo-American males differ in physical fitness or anthropometric measures; to determine if the relationships between age and physical fitness, age and arthropometric measures, and anthropometric measures and physical fitness items are significantly different for Mexican-American and Anglo-American males; to compare the rate of maturation for pre-adolescent Mexican-American and Anglo-American males in physical fitness items and anthropometric measures.

This study seeks as its purpose to establish an .objective evaluation of the counselor and his role as seen by various professional groups. The primary purpose of the investigation is to compare the perceptions of these various groups as to the tasks a counselor may perform. The study involves the distribution of an opinionn-aire to one hundred public high school counselors, one hundred public high school principals, sixty-three counselor-educators, and forty-two administrator-educators. A return percentage of seventy-nine has been realized.

This investigation is concerned with determining the extent of inservice education provided for special education personnel by the five pilot programs of Plan A. The two methods of determining this involvement are a case study of the pilot programs' inservice education and its relationship to resource agencies such as the Texas Education Agency and Regional Education Service Centers. The purposes of this study include the following: (1) determining the principles underlying the philosophy formulated by school district personnel in regard to the nature and purpose of inservice training for Plan A, (2) identifying the nature, scope, and assessment of a three-year period of inservice education for the pilot Plan A programs, (3) identifying the successful components of and the problems encountered during the three-year period of inservice education, and (4) describing recommendations for future inservice education. Only the five pilot districts are described in the case studies of Plan A programs. Data is reported in the following sequence for each of the pilot districts: background information; philosophy and goals; pre-, in-, and post-service activities for 1970-1971, 1971-1972, and proposals for inservice education for 1972-1973. Also reported is information concerning the role of the Texas Education Agency and the Regional Education …

The problem of this investigation is a case study of parental involvement in the initial Plan A public school districts in Texas. The components of parental involvement isolated for the study are parent education, parent participation, and parent counseling. The major sources of data are questionnaires distributed to parents, teachers, and administrators in the initial Plan A public school districts. Secondary sources of data include interviews with the three categories of respondents to the questionnaires, communication and correspondence with the Regional Education Service Centers, and correspondence and reports from the Texas Education Agency concerning parental involvement. The purposes of the case study of parental involvement are (1) to analyze the various approaches to provide parent education services in the selected Plan A programs, (2) to analyze the various types of parent participation in the initial Plan A programs, (3) to analyze the existing and projected needs for parent counseling in Plan A, (4) to summarize findings into recommendations for effective parental involvement strategies in future implementations of Plan A in Texas, and (5) to suggest modifications or to raise questions for further investigation.

The problem with which this investigation is concerned is that of determining the role of personality in information acquisition and utilization during the decision-making process, by replicating the Schkade-Scarborough box design and the Kernan-Mojena chip design, using an expanded battery of psychological tests. This investigation seeks to accomplish the following objectives: (1) review and summarize the present literature which relates personality and binary decision behavior; (2) review and summarize the present literature which relates personality with information transmission and utilization; (3) administer the Minnesota Multiphasic Personality Inventory (NMPI), the Gordon Personal Inventory (GPI), the Gordon Personal Profile (GPP), EAS j, and LA1S0 to a group of subjects who will also participate in both the box and the chip experimental designs; (4) replicate both the box and the chip experimental designs with a different set of subjects to test for consistency of findings; (5) perform canonical analysis on the box design, endeavoring to extend and refine the analysis of the data; and (6) compare the findings from the box and chip experimental designs, and identify areas for further research. The purpose of this study is twofold. The first is to replicate and test the research findings of Schkade-Scarborough and Kernan-Mojena, which …

The area of ethnic market segmentation has received little attention from practitioners or academicians of marketing since most minority groups immigrating to the United States have gradually assimilated the cultural norms and values, and thus the market behavior, of the American society as a whole. Preliminary investigation, however, indicates that Mexican Americans are an exception. To discover whether Mexican Americans represent a true ethnic market segment of economic significance, this study examines and analyzes several aspects. First, to determine whether Mexican Americans represent a true ethnic segment, the following aspects of their cultural norms, perceptions, and values are investigated: their distinct and unique identity, the continuity and consistency of their adoption and use, and the degree of their influence. Second, to determine whether Mexican Americans constitute an ethnic market segment, grocery shopping behavioral patterns are examined. Third, to ascertain whether Mexican Americans represent a substantial ethnic market segment in terms of the number of consumers and the amount of money spent, relevant demographic and socioeconomic characteristics are presented and analyzed. Fourth, the impact of an economically significant ethnic market segment on marketers and marketing institutions is assessed. Due to the nature of this study, emphasis is placed on the collection …

The dissertation consists of four recitals: one chamber music recital, two solo recitals, and one lecture recital. The chamber music program included a trio with the violin and cello performing with the piano. The repertoire of all of the programs was intended to demonstrate a variety of types and styles of piano music from several different historical periods. The lecture recital, "The Poetic Ideal in the Piano Music of Franz Liszt," was an attempt to enter a seldomexplored area of Liszt's musical inspiration. So much has been written about the brilliant and virtuosic compositions which Liszt created to demonstrate his own technical prowess that it is easy to lose sight of the other side of his creative genius. Both as a composer and as an author, Liszt reiterated his belief in the fundamental kinship of music and the other arts. The visual arts of painting and sculpture were included, but he considered the closest relationship to be with literature, and especially with poetry.

This study seeks to develop and evaluate a program of selfinstructional drill materials for improving the ability of students to detect pitch errors in choral singing. The specific purposes of the study are as follows: (1) To develop and validate a visualaural test for pitch-error detection; (2) to develop a visual-aural, self-instructional program for improving the ability of students to detect pitch errors; and (3) To determine whether the program of self-instructional drill materials modifies the ability to detect pitch errors. In the first phase of this three-phase study, a body of testing materials was assembled, pilot-tested, edited, and judged reliable for use. In Phase II a body of self-instructional, programmed drill materials was assembled, pilot-tested, corrected, and judged ready for evaluation. In Phase III the procedures were as follows: (1) the subjects for whom the program was intended were administered a pretest of their pitch-error detection ability; (2) one group (A) participated in the programmed drill materials developed, while the other group (B) used no programmed materials; (3) both groups were administered a midtest to determine whether there was any change; (4) the latter group (B) participated in the programed drill materials developed, while the first group (A) no …

The problem with which this investigation is concerned is that of demonstrating the applicability of a particular theory and technique to two materials of different band structure, InSb and HgSe, and in doing so, determining the deformation potentials of these materials. The theory used in this investigation predicts an inversion-asymmetry splitting and an anisotropy of the Fermi surface under uniaxial stress. No previous studies have ever verified the existence of an anisotropy of the Fermi surface of semiconductors under stress. In this work evidence will be given which demonstrates this anisotropy. Although the inversion-asymmetry splitting parameter has been determined for some materials, no value has ever been reported for InSb. The methods presented in this paper allow a value of the splitting parameter to be determined for InSb.

The lecture recital was given December 5, 1971. A discussion of Beethoven's 33 Variations on a Waltz by Diabelli, Op. 120 included the circumstances under which the work was composed, analysis of the composition, and controversial opinions on the Variations. The piece was then performed by memory. In addition to the lecture recital three other public recitals were performed. These consisted entirely of solo literature for the piano. The first solo recital was on April 12, 1970, and included works of Bach, Beethoven, and Liszt. Part of the preparation included the writing of program notes of a historical and analytical nature. The second solo recital, on January 31, 1971, consisted entirely of sonatas by Beethoven, Chopin, and Prokofiev. The final solo program, on August 11, 1972, included works by Bach, Schumann, and Granados. All four programs were recorded on magnetic tape and are filed, along with the written version of the lecture material, as a part of the dissertation.

The problem with which this investigation was concerned was that of determining the effects that an achievement motivation program had on changing the self-concepts and academic achievement among ninth-grade students in a triethnically mixed junior high school. The subjects for this study were ninth-grade students from a large southwestern city. The experimental program was conducted in a junior high school composed of Anglo, Mexican-American, and Negro students of approximately 30 per cent, 40 per cent, and 30 per cent ratios, respectively. The comparison school was an adjoining area with approximately the same ethnic mixture. In measuring changes in self-concept, the Piers-Harris Children's Self-Concept Scale was used. Teacher-assigned grades converted to numerical equivalents were used in measuring changes in academic achievement. All hypotheses were tested at the .05 level of confidence by using two by three analysis of covariance. All data were entered on computer cards, using computer services of North Texas State University.

A procedure for the isolation of malic enzyme from muscle tissue of the roundworm Ascaris suum is described. The fractionation method yields relatively large quantities of the enzyme,with a specific activity of fifteen moles of malate converted to pyruvate and carbon dioxide per min per mg at 25º. Homogeneity was established with analytical ultracentrifugation, zone electrophoresis, isoelectric focusing, and rechromatography. The molecular weight of the enzyme was 250,000, and it is dissociated under several conditions into four identical monomers of 64,000 daltons. The enzyme exists as a single electrophoretic form and prefers manganous and NAD over other cations and NADP. Ammonium sulfate competes with manganous for the active site and titration with DTNB yields eight thiol groups per mole. Titration of the first four thiol groups is accompanied by a complete loss in enzyme activity. Equilibrium dialysis, product inhibition, and initial velocity studies suggest a rapid-equilibrium random sequential mechanism for the Ascaris suum malic enzyme. The presence of 1.3 binding sites per subunits was determined for L-ma late. Antisera prepared against A. suum malic enzyme reacted to a small extent with the NAD malic enzymes from two free-living nematodes, Panarellus redivivus and Turbatrix aceti. A correlation coefficient of 0.911 was …

This study compares certain factors of Austin College financial aid recipients to the same factors in their classmates who received no financial assistance. First, this study attempts to determine whether there are significant differences in selected variables between these two groups. Second, the study seeks to identify the causes for students' withdrawing from the College. Subjects were randomly selected from two groups: (l) 100 subjects receiving financial assistance; and (2) 100 subjects not receiving such assistance. The sources of data for this study were students'. records located in the Educational Advising Center, the Records Office, and the. Counseling Center.

The problem with which this investigation is concerned is that of developing a scale for rating a public school superintendent in Texas in terms of his adherence to selected characteristics of administrative leadership. A secondary problem is to verify the hypothesis that very few schools in Texas, if any, use a rating scale to evaluate the performance of the superintendent. The purpose of this study will be to identify a set of administrative leadership characteristics which are accepted by members of Boards of Trustees, professors of educational leadership, and superintendents.

The purposes of this study are to identify and describe the function and control of facial muscles as related to sound production on brasswind instruments, to explore electromyographic theory and techniques with particular regard to the function and control of facial muscles, to identify basic theories of embouchure among brasswind teachers and performers, to develop a theory of brasswind embouchure based upon the preceding factors, and to propose recommendations with regard to brasswind pedagogy. Existing theories of embouchure were investigated by reviewing the extensive brasswind pedagogical literature, and by interviewing teachers representing two widely differing views. Electromyographic kinesiology of facial muscles was investigated as follows: a description of facial muscles was formulated by collating anatomy books; related electromyographic literature was reviewed; eloctromyographic recordings of facial muscled during, the performance of various facial muscle tasks and during brasswind performance were made using indwelling fine-wire electrodes. The following fundamental questions were raised: (1) What are the elements of brasswind embouchure, and what is the effect of each upon performance? (2) Is there a single embouchure mode which may be considered most efficient, and if so, what facial muscles are involved, and how may they be trained?

The purpose of this study was to determine the effects that certain classroom management techniques would have on the self concepts and choice status of sixth grade students and to assess the potential of these techniques. All sixth grade students (86) enrolled in one elementary school participated in this study. There were four class sections, two of which made up the experimental group and two of which made up the control group. Only those students who were enrolled at the beginning of the study were included in the final data analysis. The IPAT Children's Personality Questionnaire, What You Do and What You Think (1963) provided a measurement of self concept. This instrument was reported to be a standardized self evaluation scale that assessed fourteen factors of personality. The sociometric test of specific criteria was used to identify students of low choice status. These two instruments were administered in January of 1972 and again in May of 1972.

The problem with which this investigation is concerned is that of presenting a concise English translation of the book which Martin Agricola wrote in 1528 in German on the musical instruments and practices of his time. In addition to the translation itself, there is a major section devoted to a comparison of the material of Musica instrumentalis deudsch with other books and treatises on the same and related subjects which were written at approximately the same time or within the next hundred years. Agricola states that the purpose of his book was to teach the playing of various instruments such as organs, lutes, harps, viols, and pipes. He also noted that the material was prepared expressly for young people to study. To facilitate the accomplishment of this purpose Agricola wrote the book in short, two-lined, rhymed couplets so that the youths might quickly memorize the material and thus retain the instructions better.