Ability Grouping in College Beginning Media Writing Classes (open access)

Ability Grouping in College Beginning Media Writing Classes

The problem with which this investigation is concerned is that students of unequal writing ability are frequently placed in the same beginning media writing classes in college journalism. It is difficult for a teacher to be effective when the ability of the students ranges from those who cannot write clear complete sentences to others whose work already appears in newspapers and magazines. The purpose of this study is to determine whether students who are ability grouped into slow—average and advanced groups do the same, better, or worse than heterogeneously grouped students. In the spring semester of 1987, students in Journalism 1345, Media Writing laboratory, at the University of Texas at Arlington, were given a pretest to determine how well they wrote a simple news story and a simple feature story. On the basis of that test, which was graded by three raters, the students were placed in two separate ability groups in three classes. The fourth class contained students with heterogeneous abilities who were not placed in groups. At the end of the semester a posttest was given in news and feature writing. A two-way analysis of variance was used to analyze the posttest scores of sixty-seven students. There was …
Date: December 1987
Creator: Haber, Marian Wynne
System: The UNT Digital Library
Aerobic Conditioning: Effects on Locus of Control, Mood States, and General Well-Being (open access)

Aerobic Conditioning: Effects on Locus of Control, Mood States, and General Well-Being

This study was conducted to examine the sequelae of cardiovascular conditioning on locus of control, short-term mood, and psychological well-being. A pre-post test design, with control group, was used to measure the effects of a one month program of aerobic conditioning on adult volunteers. This study also sought to examine ways in which fitness changes covaried with psychological changes, and to describe patterns of change taking place during aerobic conditioning.
Date: December 1987
Creator: Bertschler, John Joseph, 1948-
System: The UNT Digital Library
The American Reception of Jane Austen's Novels from 1800 to 1900 (open access)

The American Reception of Jane Austen's Novels from 1800 to 1900

This thesis considers Jane Austen's reception in America from 1800 to 1900 and concludes that her novels were not generally recognized for the first half of the century. In that period, she and her family adversely affected her fame by seeking her obscurity. From mid century to the publication of J.E. Austen-Leigh's Memoir in 1870, appreciation of Austen grew, partly due to the decline of romanticism, and partly due to the focusing of critical theory for fiction, which caused her novels to be valued more highly. From 1870 to 1900 Austen's novels gained popularity. The critics were divided as to those who admired her art, and those who found her novels to be dull.
Date: December 1987
Creator: Wood, Sarah
System: The UNT Digital Library
An Analysis of the Peer Relationships of Gifted and Gifted-Creative Primary Students (open access)

An Analysis of the Peer Relationships of Gifted and Gifted-Creative Primary Students

The purpose of this study was to compare the peer relationships of highly gifted and highly gifted-highly creative primary students in a gifted classroom of a public school. The study was conducted using thirty-one highly gifted first, second, and third graders who had scores of 140 or better on the WISC-R, WPPSI, or Otis-Lennon. At the beginning of the school year, the Creativity Assessment Packet was administered to the class. The top 20 percent scorers in the class (termed gifted-creative) and those who scored in the bottom 20 percent of the class (termed gifted) on the CAP were targeted for observation. In addition, a sociogram was administered to each student individually for the purpose of determining each child's social status. A bivariate correlation coefficient was employed to express the degree of any relationship between creativity scores and rankings on the class sociogram. Observational anecdotes were used in the discussion of the sociometric results. The following findings resulted from the study. The gifted-creative students, as a group, ranked higher on a class sociogram on measures of friendship and choice of academic work partners than did the gifted group. On sociometric measures of choice of creative work partners, there was no significant …
Date: December 1987
Creator: Greene, Debra Blatt
System: The UNT Digital Library
The Attitudes of International Students Toward University Withdrawal (open access)

The Attitudes of International Students Toward University Withdrawal

The purpose of this study was to determine if significant differences existed in attitudes of international students concerning college withdrawal. Data collection involved 200 freshmen international students from two universities in Texas. Two questionnaires were distributed to the students to determine attitudes toward college withdrawal. The instrument used to score the attitudes was the Purdue Master Attitude Scale. The analysis of variance was used for the statistical evaluation. The statistics indicated there was no significant differences between the students tested in the study and that the students had favorable attitudes toward college and unfavorable attitudes toward college withdrawal. Based on the findings of this study, universities should devise an extensive counseling and orientation program in order to provide students opportunities to complete their college education.
Date: December 1987
Creator: Ghoreyshi, Mohammad
System: The UNT Digital Library
Balance-of-Power Theory and the Ethiopian-Somali Conflict of 1977- 1978 (open access)

Balance-of-Power Theory and the Ethiopian-Somali Conflict of 1977- 1978

Balance-of-Power theory was tested by examining the 1977-1978 Ethiopian-Somali conflict and its outcome. The theory, according to Waltz (1979), claims to explain the international outcome arising from realpolitik or power politics, namely, the formation of balances of power. Given the close fit between the major developments leading to the eruption of conflict and the principal propositions of balance-of-power theory, the outcome of the conflict was expected to be consistent with that posited by the theory. This expectation was borne out by the study's finding which indicated that the conflict has produced a similar result. Confirmation of the theory was achieved by further subjecting the finding to the verification test established by Waltz.
Date: December 1987
Creator: Ogundele, Ayodeji O. (Ayodeji Olusesi)
System: The UNT Digital Library
Britain and the Supreme Economic Council 1919 (open access)

Britain and the Supreme Economic Council 1919

This dissertation attempts to determine what Britain expected from participation in the Supreme Economic Council (SEC) of the 1919 Paris Peace Conference and to what extent its expectations were realized. An investigation of available sources reveals that access to European markets and raw materials and a balance of power to prevent French, German, or Russian hegemony in Europe were British foreign policy goals that SEC delegates sought to advance. Primary sources for this study include unpublished British Foreign Office and Cabinet records, published British, United States, and German government documents, unpublished personal papers of people directing SEC efforts, such as David Lloyd George, Austen Chamberlain, Cecil Harmsworth, Harry Osborne Mance, and John Maynard Keynes, and published memoirs and accounts of persons who were directly or indirectly involved with the SEC. Secondary accounts include biographies and histories or studies of the Peace Conference and of countries affected by its work. Primarily concerned with the first half of 1919, this dissertation focuses on British participation in Inter-allied war-time economic efforts, in post-war Rhineland control, in the creation of the SEC, and in the SEC endeavors of revictualling Germany, providing food and medical relief for eastern Europe, and reconstructing European communications. It concludes …
Date: December 1987
Creator: Scogin, Katie Elizabeth
System: The UNT Digital Library
Causal Attributions, Attributional Dimensions, and Academic Performance in a School Setting (open access)

Causal Attributions, Attributional Dimensions, and Academic Performance in a School Setting

The attribution model of achievement motivation has been applied to academic achievement as a way of understanding underachievement and as a basis for developing intervention programs. There has been little applied research in this area, however, that supports the use of the model in school settings. The purpose of the present study was to test the applicability of the model to an actual school setting. Subjects were 149 tenth grade students in a large urban school district. In accordance with the model, specific attributions for success or failure were assessed, as well as subjects' perceptions of the locus, stability, and controllability of attributions. Attribution patterns found in previous analog research were not found in a school setting. Immediate effort attributions were the most prevalent, regardless of performance level or outcome. Causal beliefs were found to relate to performance in ways predicted by the model but also in some ways not predicted. Relationships were generally stronger for high performers. Comparing subjects' perceptions of the dimensional properties of attributions across outcomes showed a strong outcome bias. Attributions were perceived as more internal and stable following successes, consistent with previous research. In addition, a performance level bias was found. Low performers rated attributions …
Date: December 1987
Creator: Huffine, John Harold
System: The UNT Digital Library
A Comparison of Academic Achievement of Boys and Girls from Full-Day and Half-Day Kindergartens (open access)

A Comparison of Academic Achievement of Boys and Girls from Full-Day and Half-Day Kindergartens

The purpose of this study was to determine whether any differences in academic achievement existed between full-day and half-day kindergarten students at the end of their kindergarten and first-grade school years. Two public schools considered comparable in size, philosophy, and socioeconomic levels of a large school district in Texas participated in the study. One of the schools provided a full-day kindergarten program; the other school provided a half-day kindergarten program. Kindergarten students from each of the two schools were match-paired according to birthday and sex. The total sample size was fifty students. All students were tested in December, 1985, with the Metropolitan Achievement Test. Preprimer Level, and in May, 1986, the end of the kindergarten year, with the Primer Level of the Metropolitan Achievement Test. The Metropolitan Achievement Test. Primary I Level, was additionally administered to the subjects in April, 1987, at the end of their first-grade school year. During each testing period, the subjects were administered the Reading, Language, and Math subtests of the Metropolitan Achievement Test. The following supplemental data also were gathered on the students: The Metropolitan Readiness Test II scores and the TEAMS test scores. The data obtained from the testing batteries were statistically analyzed using …
Date: December 1987
Creator: Tabb, Juanita K. (Juanita Kay)
System: The UNT Digital Library
Comparison of Methods for Computation and Cumulation of Effect Sizes in Meta-Analysis (open access)

Comparison of Methods for Computation and Cumulation of Effect Sizes in Meta-Analysis

This study examined the statistical consequences of employing various methods of computing and cumulating effect sizes in meta-analysis. Six methods of computing effect size, and three techniques for combining study outcomes, were compared. Effect size metrics were calculated with one-group and pooled standardizing denominators, corrected for bias and for unreliability of measurement, and weighted by sample size and by sample variance. Cumulating techniques employed as units of analysis the effect size, the study, and an average study effect. In order to determine whether outcomes might vary with the size of the meta-analysis, mean effect sizes were also compared for two smaller subsets of studies. An existing meta-analysis of 60 studies examining the effectiveness of computer-based instruction was used as a data base for this investigation. Recomputation of the original study data under the six different effect size formulas showed no significant difference among the metrics. Maintaining the independence of the data by using only one effect size per study, whether a single or averaged effect, produced a higher mean effect size than averaging all effect sizes together, although the difference did not reach statistical significance. The sampling distribution of effect size means approached that of the population of 60 studies …
Date: December 1987
Creator: Ronco, Sharron L. (Sharron Lee)
System: The UNT Digital Library
A Comparison of the Performance of the Radical and Conservative Models of Economic Development in the Carribean Basin (open access)

A Comparison of the Performance of the Radical and Conservative Models of Economic Development in the Carribean Basin

The present study is an attempt to compare the performance of two competing models of economic development-- the conservative and radical models. The conservative model is represented by the Central American countries of El Salvador, Guatemala, and Honduras; the radical model is represented by Cuba. The following chapters focus on a comparison of these models as they have manifested themselves in the Carribean basin. The analysis of the performance of the models is conducted by comparing socioeconomic variables of the countries representing the models. The study looks at the time period 1960 - 1980 which coincides with the adoption of the two models in the respective countries.
Date: December 1987
Creator: Alfaro, Alban Salazar
System: The UNT Digital Library
A Comparison of the Transcription Techniques of Godowsky and Liszt as Exemplified in Their Transcriptions of Three Schubert Lieder (open access)

A Comparison of the Transcription Techniques of Godowsky and Liszt as Exemplified in Their Transcriptions of Three Schubert Lieder

This investigation sought to compare the transcription techniques of two pianist-composers, Godowsky and Liszt, using three Schubert lieder as examples. The lieder were "Das Wandern" from Die Schöne Müllerin, "Gute Nacht" from Winterreise, and "Liebesbotschaft" from Schwanengesang. They were compared using four criteria: tonality, counterpoint, timbral effects, and harmony. Liszt, following a practice common in the nineteenth century, was primarily concerned with bringing new music into the home of the domestic pianist. The piano transcription was the most widely used and successful medium for accomplishing this. Liszt also frequently transcribed pieces of a particular composer in order to promulgate them by featuring them in his recitals. The Schubert lieder fall into this category. Liszt did not drastically alter the original in these compositions. Indeed, in the cases of "Liebesbotschaft" and "Das Wandern," very little alteration beyond the incorporation of the melody into the piano accompaniment, occurs.Godowsky, in contrast, viewed the transcription as a vehicle for composing a new piece. He intended to improve upon the original by adding his own inspiration to it. Godowsky was particularly ingenious in adding counterpoint, often chromatic, to the original. Examples of Godowsky's use of counterpoint can be found in "Das Wandern" and "Gute Nacht." …
Date: December 1987
Creator: Cloutier, David, 1948-
System: The UNT Digital Library
A Comprehensive View of Faith in "The Brothers Karamozov" Through the Collective Personality (open access)

A Comprehensive View of Faith in "The Brothers Karamozov" Through the Collective Personality

In examining Dostoevsky's treatment of faith in The Brothers Karamazov, critics often focus solely on "The Grand Inquisitor." Dostoevsky, however, refutes the Inquisitor's views through the movement of the three Karamazov brothers toward faith. The three Karamazov brothers, as a collective personality, represent the fundamental needs of man and the corresponding aspects of faith, each brother being an individual study of the necessity of integrating soul, heart and mind into faith. The crises that each brother faces force each one to develop a fuller dimension of faith. The final effect of integrating the soul, heart and mind in faith is active love.
Date: December 1987
Creator: Schimelpfenig, Sharla J. (Sharla Jan)
System: The UNT Digital Library
The Departing Experience: a Qualitative Study of Personal Accounts by Women Who Are Former Athletic Directors of Intercollegiate Athletic Programs for Women (open access)

The Departing Experience: a Qualitative Study of Personal Accounts by Women Who Are Former Athletic Directors of Intercollegiate Athletic Programs for Women

What happened to women who are former athletic directors of intercollegiate athletic programs during each of the four stages of the departing experience was the problem of this study. A qualitative design using personal interviews for data collection and ethnoscientific explanation for analysis of the data were used to study thirty-one women who were athletic directors between 1975 and 1986. Analytical tasks performed for each of the four levels of analysis helped answer research questions directed toward finding patterns among women in the following areas: what happened to them within and throughout the four stages of the departing experience, reasons they left the position of athletic director, and satisfaction in their subsequent job. Analysis of the data established that the departing experience occurred in four stages. How the subjects responded to the way that opportunities for female student-athletes were offered during each st3ge of the departing experience determined whether they were in positive or negative circumstances. Sixteen subjects either were in positive circumstances throughout the departing experience or ended it in positive circumstances. Fifteen subjects were either in negative circumstances throughout the departing experience or ended it in negative circumstances. The ability to reevaluate their beliefs and values, adapt to …
Date: December 1987
Creator: Disselkoen, Jackie M.
System: The UNT Digital Library
Determination of the Lactate Threshold by Respiratory Gas Exchange Measures and Blood Lactate Levels During Incremental-Load Work (open access)

Determination of the Lactate Threshold by Respiratory Gas Exchange Measures and Blood Lactate Levels During Incremental-Load Work

The purpose of this investigation was to examine the change in pulmonary ventilation (V_E), ventilatory equivalent of oxygen (VE_O_2) and lactic acid (LA) in relation to oxygen uptake (V_O_2) as predictors of the lactate threshold (LT). Eight healthy male (21.9 ± 3.0 years) subjects conducted three incremental-load tests. In each test the initial work rate consisted of 4 minutes of unloaded pedaling ("0" load) followed by incremental-load work of 360 Kgm • min^-1 at 60 rpm for trial I and trial II, while during trial III the work rate consisted of 540 Kgm • min^-1 of incremental-load work at 90 rpm. Work load was increased every third minute until the subject reached voluntary exhaustion. Blood samples from a forearm vein were collected during trial II (60 rpm) and trial III (90 rpm) and analyzed for lactic acid. In our subjects the measured (x̄ ± SD) lowest VE_O_2 for O_2 in relation to V_O_2 for trial I of 22.9 ± 1.9 occurred at a V_O_2 of 1.27 ± 0.8 L • min^-1. For trial II the VE_O_2 of 22.4 ± 1.3 occurred at a V_O_2 of 1.30 ± 0.09 L • min^-1, while for trial III a VE_O_2 of 24.4 ± …
Date: December 1987
Creator: Duvillard, Sergei Petelin von.
System: The UNT Digital Library
Dispute Resolution Studies in the Institutions of Higher Learning: an Initial Investigative Study of Professors' Attitudes (open access)

Dispute Resolution Studies in the Institutions of Higher Learning: an Initial Investigative Study of Professors' Attitudes

Conflict is present in all human relationships and societies. Throughout history, fighting has been more notable than peacemaking. Only recently have conflict resolution studies entered the mainstream of academia. Since peace is no longer an option, but a necessity, educators must become actively engaged in promoting the importance of peacemaking skills among their students. In 1986, the National Institute for Dispute Resolution funded a study of conflict resolution in higher education. Results disclosed a proliferation of courses but little about their quality. The present study evaluates the status of alternative dispute resolution (ADR) in the curricula of three major universities in North Texas and compares it with results from four other universities which were reported to have the heaviest concentration of ADR courses. A questionnaire was constructed to collect data in the following areas: place, significance of ADR in contemporary curricula, important factors determining attitudes toward ADR, and expectations/aspirations of faculty concerning teaching of ADR. Using a Likert scale, attitudes toward ADR were measured through regression analysis. Four of seven independent variables (age, sex, political orientation, and ADR training) were significant at jd = .05. Forty ADR-related courses were identified in seven universities. The concentration of ADR courses was management …
Date: December 1987
Creator: Ghadrshenass, Delavar
System: The UNT Digital Library
The Economic Feasibility of Utilizing Computer-Assisted Instruction as a Primary Teaching Strategy in Schools of Vocational Nursing in Texas (open access)

The Economic Feasibility of Utilizing Computer-Assisted Instruction as a Primary Teaching Strategy in Schools of Vocational Nursing in Texas

Each vocational nursing program in Texas was surveyed to determine the faculty and media costs per student classroom instructional hour. Data were obtained from 131 schools, or 99 per cent of the population. These schools taught a total of 4,718 students. The average faculty cost was $1.72 per hour. Faculty cost ranged from $0.17 to $7.75. The average media cost was $0.12 per student hour with a range from no media expenditure to $7.55. The reliability of these costs was not demonstrated. Each program director was asked to identify a principal textbook representing the content taught for each content area in their program. A total of 75 textbooks were identified by two or more programs. A cross tabulation analysis procedure yielded 1,582 combinations of 2 or more textbooks from 2 or more schools. Twenty-five per cent of the schools used the most frequently identified combination of two textbooks. Computer hardware and operating expenses were subtracted from the combined faculty and media cost per student classroom instructional hour. The amount remaining for software purchase was identified as $1.61 with a range of from $0.03 to $7.85 per hour for teaching the required 600 hours. The twenty textbook combinations with the greatest …
Date: December 1987
Creator: Wilson, Bruce K. (Bruce Keith)
System: The UNT Digital Library
The Effect of Comparative Well-Being on the Perceived Risk Construct: a Study of the Purchase of Apparel (open access)

The Effect of Comparative Well-Being on the Perceived Risk Construct: a Study of the Purchase of Apparel

The purpose of this research was to examine how the intervening variable of comparative well-being (which is how persons view their age, financial resources, and health compared to others of their own age) will enhance the significance of the relationship between selected demographic and psychographic variables and perceived risk. Specifically, the research investigated the structural relationship between comparative well-being in four different statistical models: (1) as an independent predictor of perceived risk; (2) as an intensifier of the psychographic and demographic predictors of perceived risk; (3) as a covariate of perceived risk; and (4) finally, as a jointly dependent variable with perceived risk. This approach was pursued in an effort to enhance the traditional marketing use of demographic and psychographic variables in predictingconsumer buying behavior. The data for this study were gathered as part of a national consumer-panel mail survey utilizing approximately 3,000 households. The research instrument was a self-administered questionnaire which collected demographic, psychographic, and perceived risk information from purchasers of apparel wear. Data analysis included descriptive statistics, Pearson product moment correlation analysis, factor analysis, analysis of variance (ANOVA), and multivariate analysis of variance (MANOVA). The findings have identified the importance of how consumers position themselves in society, based …
Date: December 1987
Creator: McConkey, C. William (Charles William)
System: The UNT Digital Library
Effects of Time Spent on Computer-Assisted Instruction on Attitudes of Sixth Grade Students Toward Computers (open access)

Effects of Time Spent on Computer-Assisted Instruction on Attitudes of Sixth Grade Students Toward Computers

The purposes of this study were threefold: (1) to examine the effects of time spent on CAI on student attitudes, (2) to examine the effects of time spent on CAI among ability groups, and (3) to determine whether initial attitudes would be maintained throughout a school year, and if not, determine variables associated with an attitude shift.
Date: December 1987
Creator: Campbell, Penny Renae
System: The UNT Digital Library
An Ethnographic Study of an Adlerian Play Therapy Training Program (open access)

An Ethnographic Study of an Adlerian Play Therapy Training Program

This study utilized ethnomethodology to provide a description of the process and the effect of training counselors to incorporate the concepts and techniques of Individual Psychology into play therapy. Transcripts of the training program and of three individual interviews with the nine counselors who participated in the training were made. These transcripts and the journals in which the subjects were asked to chronicle their personal experiences and reactions to the training were qualitatively analyzed. This analysis indicated that most of the subjects reported that their attitudes toward play therapy, toward themselves as play therapists, and toward their play therapy clients had changed after their participation in the Adlerian play therapy training. The majority of subjects also reported that they perceived that their behavior in their play therapy sessions had changed, frequently in the direction of including more creative and active techniques. Qualitative analysis of the transcripts made from videotaped play therapy sessions by the researcher and an outside evaluator indicated that, while some of the counselors' behaviors seemed to have changed after the training, many of the counselors' behaviors did not appear to have been affected by their participation in the training. Possible explanations of the discrepancy between the counselors' …
Date: December 1987
Creator: Kottman, Terry
System: The UNT Digital Library
An Examination of the Behavioral Dimensions of Behaviorally Disordered Students Across Grade Levels Utilizing Confirmatory Factor Analysis (open access)

An Examination of the Behavioral Dimensions of Behaviorally Disordered Students Across Grade Levels Utilizing Confirmatory Factor Analysis

A review of the literature regarding behavioral characteristics and underlying factors for behaviorally disordered (BD) students revealed that both elementary school aged and secondary school aged BD students may be able to be described by a similar factor structure. Utilizing ratings obtained on a national sample of BD students with the Behavioral Dimensions Rating Scale (BDRS). Research Edition, the pattern of item ratings for students in grades kindergarten through five (K-5) and grades six through eleven (6-11) was examined to confirm this literature-based theory. Multigroup simultaneous confirmatory factor analysis using maximum likelihood estimation procedures was utilized to compare the covariance structures of students in grades K-5 and grades 6-11. A goodness-of-fit index revealed that the covariance matrices of the two groups were invariant. Since the same factor structure could be used to describe BD students in grades K-5 and grades 6-11, the means for the two groups were compared using Hotelling's T^2 statistic for two independent samples. The analysis resulted in finding a significant difference between the two groups' means. A univariate F test was conducted for the behavioral dimensions to locate the source of the mean difference. A significant difference was found only for Factor I: Aggressive/Acting Out, indicating …
Date: December 1987
Creator: Sarnacki, Ronald L. (Ronald Leonard)
System: The UNT Digital Library
An Examination of Two Significant Percussion Compositions: Karlheinz Stockhausen's Zyklus and Ingolf Dahl's Duettino Concertante, a Lecture Recital Together with Five Recitals of Selected Works of A. Ginastera, A. Wilder, W. Kraft, and Others (open access)

An Examination of Two Significant Percussion Compositions: Karlheinz Stockhausen's Zyklus and Ingolf Dahl's Duettino Concertante, a Lecture Recital Together with Five Recitals of Selected Works of A. Ginastera, A. Wilder, W. Kraft, and Others

Zvklus (1959) by Karlheinz Stockhausen and Duettino Concertante (1966) by Ingolf Dahl represent two of the most significant percussion compositions that present the percussionist as soloist. The performer of these works, either unaccompanied or accompanied by a non-percussion instrument, is featured as executant, interpreter, and improvisor. They are regarded as classics in the medium of multiple percussion because of their frequency of performance and their profound effect on notation, musical composition, and the technical expectations of the percussionist. This paper examines these compositions and their historical significance to both percussion literature and the percussionist. Each of these compositions is analzyed by examining instrumentation, compositional procedures, and performance problems. Finally, the notational procedures and role of the performer in these compositions are compared. A discussion of the development of the percussion batterie, percussion ensemble, and the important early solo multiple percussion compositions provides historical perspective for these compositions. This perspective is enhanced by consideration of biography, influences, and stylistic development of each composer.
Date: December 1987
Creator: Carney, Michael R. (Michael Reed), 1952-
System: The UNT Digital Library
Existence of an Alpha One-Adrenoceptor-Mediated Coronary Vasoconstrictor Reflex During Acute Systemic Hypoxia, in Anesthetized, Open-Chest Dogs (open access)

Existence of an Alpha One-Adrenoceptor-Mediated Coronary Vasoconstrictor Reflex During Acute Systemic Hypoxia, in Anesthetized, Open-Chest Dogs

The presence of an alpha-adrenoceptor--mediated coronary vasoconstrictor reflex during acute systemic hypoxia was examined in thirteen chloralose-anesthetized dogs. Local vasodilator effects were avoided by perfusing the left common coronary artery (LCC) with normoxic blood, while the dogs were ventilated with 5% 02-95% N2 . Left ventricular afterload was held constant and positive cardiac inotropic responses and beta two-adrenoceptor-mediated coronary vasodilation were blocked by propranolol. Parasympatheticmediated bradycardia and coronary vasodilation were blocked with atropine. Systemic hypoxia decreased LCC flow to normoxic myocardium by 19.4+2.6 %. Although myocardial oxygen extraction increased 9.7+2.9 %, myocardial oxygen consumption decreased 16.5+2.6 %. Intracoronary prazosin prevented the reflex vasoconstriction during repeated hypoxia.
Date: December 1987
Creator: Grice, Derald Preston
System: The UNT Digital Library
Factors of Depression in the Elderly: Assessment and Implications for Diagnosis (open access)

Factors of Depression in the Elderly: Assessment and Implications for Diagnosis

The problem of assessment and diagnosis of depression in the elderly begins with the definition of depression being indefinite. In this study, the theory of learned helplessness was chosen because of its value in organizing research within a learning theory framework. The Beck Depression Inventory, measures of fluid and crystallized intellectual ability, locus of control, and attribution of success and failure were chosen as variables for an exploratory factor analysis. The purpose of selecting these variables was to assess the cognitive, motivational, and affective components of learned helplessness as they affected the responses of elderly subjects to depression items. Self report measures of income, education, and health, were included to assess the relationship of these variables to depression. A somatic factor was predicted to correlate with an affective factor of depression.
Date: December 1987
Creator: Kunsak, Nancy Elizabeth
System: The UNT Digital Library