Thesis (M.A.)--Northern Kentucky University, 2006. / Made available through ProQuest. Publication number: AAT 1438488. ProQuest document ID: 1240707181. Includes bibliographical references (p. 72)

Thesis (M.A.)--Northern Kentucky University, 2006. / Made available through ProQuest. Publication number: AAT 1435894. ProQuest document ID: 1136092791. Includes bibliographical references (p. 32-34)

Thesis (M.A.)--Northern Kentucky University, 2006. / Made available through ProQuest. Publication number: AAT 1435893. ProQuest document ID: 1136092771. Includes bibliographical references (p. 39-41)

Thesis (M.A.)--Northern Kentucky University, 2006. / Made available through ProQuest. Publication number: AAT 1435674. ProQuest document ID: 1147189041. Includes bibliographical references (p. 56)

Thesis (M.A.)--Northern Kentucky University, 2006. / Made available through ProQuest. Publication number: AAT 1435882. ProQuest document ID: 1136092781. Includes bibliographical references (p. 34-36)

The synergistic effect between each of two minor contaminating UV wavelengths has been studied. The TC-7 host cell-capacity system was used. The macromolecular damage induced in monolayers of cell cultures as the result of exposure to UV radiation was measured by determining the ability of irradiated cells to support the replication of Herpes simplex virus. The macromolecule involved has been shown to be DNA and the damage is probably due to the formation of thymine dimers plus some undefined chromosphore associated with the DNA of the cell. Preliminary experiments showed that low exposures of germicidal radiation are less effective in decreasing the survival of capacity while higher exposures are more effective when compared to monochromatic 254 nm radiation. Subsequent experiments showed a synergistic interaction between 254 nm and either 295 nm or 313 nm radiation at doses comparable to those emitted from a germicidal lamp as well as greatly increased doses.

The purpose of this thesis was twofold: to investigate the effects of categorized versus uncategorized material on selective attention and to test predictions derived from Filter Theory (Broadbent, 1958), Response Selection Theory (Deutsch and Deutsch, 1963), and Attenuation Theory (Treisman, 1969). Subjects performed a dichotic-listening task in which they shadowed a list of words presented to one ear (i.e., relevant message) while trying to ignore a simultaneously presented list of words on the other ear (i.e., irrelevant message). Lists were 16 words in length and consisted of either categorized words (C) or uncategorized words (U) presented at a rate of one word per second. Four conditions were generated by using all pairings of C lists and U lists for relevant versus irrelevant messages: U-U, U-C, C-U and C-C. Note that the left-most symbol designates the relevant message and the right-most symbol designates the irrelevant message. Subjects received two presentations of each of the four conditions. Measurements of pupil size were taken twice (9 sec and 5 sec) before the presentation of each dichotic trial (i.e., baseline measures) and at six positions (1, 4, 7, 10, 13 and 16) in the word lists (i.e., trial measures). Since each subject received eight experimental trials (two trials in each of four conditions), there were a total of four baseline measurements and twelve trial measurements for each condition. In each condition the four baseline measurements were averaged and the two trial measurements were averaged at each of the six positions. The mean baseline was subtracted from each of the six position means in each condition. These mean difference scores were used as the basis for one analysis. Shadowing errors (i.e. omissions of relevant words, mispronunciations of relevant words, or intrusions of irrelevant words) were scored by quadrants separately for each of the four conditions. The first quadrant consisted of the first through fourth words, the second quadrant consisted of the fifth through eighth words and so on. Error scores were then converted to percents and used as the bass for a second analysis. A 4 by 6 ANOVA with repeated measures on both factors (condition and position, respectively) was used to analyze the pupil size data. The results indicated that pupil size decreased across serial position in a similar fashion for all conditions. Furthermore, pupil size did not differ significantly among the four conditions. A 4 by 4 ANOVA with repeated measures on both factors (condition and quadrant, respectively) was used to analyze the error rate data. The results indicated in an interaction between condition and quadrant. The C-U and C-C conditions resulted in a relatively constant error rate across quadrants, while the U-U and U-C conditions exhibited an increasing error rate across quadrants. The results of the two analyses are discussed in terms of their implications for Filter Theory, Response Selection Theory and Attenuation Theory.

Over the past decade the luminescence properties of sapphire (∝-AL2O3) and ruby (Al2O3:Cr2O3) have been the subject of many investigations because of their importance in materials technology. Sapphire and ruby are at present used as lasing materials, radiation dosimeters, and as optical windows. In order that these operations may be made more efficient, and that other useful luminescent properties may be systematically explored and developed, much attention has been given to understanding the luminescent mechanisms from the standpoint of the physics of the solid state. However, mechanisms have not yet been proposed that describe in detail the known luminescent properties of sapphire and ruby. The luminescence experiments which have been previously reported in the literature on sapphire and ruby fall into two classes: experiments in which the exciting energy is stored in the crystal by some defect mechanism and subsequently released by perturbing the crystal, and experiments in which the luminescence is observed while the crystals are being excited. Thermoluminescence, in which energy is stored in the crystals by exposing it to ionizing radiation and subsequently released by raising the temperature of the crystal, is the most extensively used technique of the former class. The facts concerning the thermoluminescence of sapphire and ruby are well documented. (11,12) Numerous experiments in the latter class have been reported in which the exciting radiation was in the visible or ultraviolet energy region. (16, 17) These latter experiments have a disadvantage; the amount of exciting energy absorbed is not independent of two important parameters, temperature and chromium concentration. It was the primary intent of these investigations to resolve the difficulty of the dependence of the absorbed energy by exciting sapphire and ruby crystals with x-rays. Because the energy of the x-ray photons incident on and within the crystal is more than an order of magnitude more energetic than is necessary to produce highly mobile or free electrons within the crystal, the number of such electrons produced is independent of the temperature and chromium concentration over the range that these parameters were varied. The program of experiments reported herein was designed to answer the following questions: (1) How does the intensity of the total luminescence depend on the temperature? (2) How does the emission spectrum depend on temperature and chromium concentration? (3) How does the luminesce yield depend on temperature? The answers to these questions were obtained by observing the luminescence of sapphire and ruby, subjected to continuous x-ray excitation, as a function of temperature and chromium concentration. The total x-ray-induced luminescence and emission spectra of two crystals, one nominally pure sapphire and the other sapphire containing 0.005% Cr2O3, were observed as the temperature of the crystals was raised and lowered between 25°C and 400°C. The results for other chromium concentrations (0.05% and 0.5% Cr2O3) may be found in Mr. Wayne Cooke’s masters’ thesis (21) The thermoluminescence total emission and emission spectra were observed between 25°C and 400°C after x-ray exposure at room temperature. It should be noted that there is one experiment in the literature in which the x-ray-induced luminescence of ruby was observed as a function of temperature.(19) The investigators observed the luminescence as the temperature increased; hence, much of the emission as the temperature decreases because the energy stored in a crystal at a particular temperature has a decreasing probability of being released at lower temperatures.

M.Sc. (Geography) / Republiek Voedsel (Edms) Bpk. was established in 1981 with the purpose of owning and operating KFC restaurants in South Africa and today successfully operates 40 KFC restaurants in Gauteng, the Free State, Northern Cape and North-West Province. This study endeavoured to create a model that could be used as an instrument to ensure that all possible variables influencing the selection of a site were considered when deciding where to build a KFC restaurant. The creation and use of an analogue data base containing the market variables, operational requirements and financial performance of all the Company's restaurants were fundamental to the success of the model. In general, the model should enable the researcher to identify under-utilized as well as non-utilized markets. Shortcomings in respect of existing restaurants and missed opportunities in the market area would be identified and exploited for the benefit of the market population and KFC/Republiek Voedsel. The specific purpose of this study was to test the validity of the proposed site selection model in the town of Edenvale, where the existing KFC is more than 10 years old. The market population characteristics, trade zone borders, market competition and traffic generators, all factors that influence the purchase pattern of the existing KFC customer base, were determined through a sample study.

Adult BALB/c mice were immunized with C57BL/6 spleen cells first on day 0 and again on day 8 of the experimental procedure. Serum was collected from these animals on day 0 (before the first immunization), day 4, day 8 (before the second immunization), day 12, and day 16. Two groups of normal BALB/c bone marrow cell suspensions were incubated with the experimental immune sera: and one of the groups of cell suspensions was subsequently incubated with bacterial lipopolysaccharide. Following the incubation steps, both groups of cell preparations were assayed for their ability to absorb the activity of the anti-Thy-1.2 serum. Subsequent testing of the residual anti-thymocyte cytotoxic activity of the absorbed anti-Thy-1.2 sera revealed that the bone narrow cells incubated with day 4 and day 8 immune sera exhibit an increased capacity to absorb the antiserum compared to control bone narrows. These observations offer positive evidence for the existence of a feedback mechanism in animals undergoing foreign tissues graft rejection; the proposed mechanism apparently provides a circulating, non cellular substance which is capable of inducing bone marrow T-cell differentiation.