Master of Science

A two-part study was undertaken to investigate and model the characteristics of rabies epizootics in wildlife populations. Initial analysis of temporal and spatial relationships between reported rabies cases in four ecologically divergent counties was conducted. No single pattern of report incidence was found to be characteristic of all counties. Concentration of rabies reports near foci of human population was the only common trend, confirming previous studies of the dependence of rabies reporting upon human population density. Topography partly determines the pattern of hum:an habitation, thereby influencing rabies report data. A computer model of wildlife rabies epizootics was written for an IBM 360/65-360/50. Based on a generalized simulation language, GASP II, this model may be used to simulate the effects of proposed rabies control.strategies on present and future epizootics. Demonstrations of techniques for simulating control by popµlation reduction, vaccination, and sterilization were presented. Statements of model limitations and suggestions for future improvements were included in the discussion of project results. / Master of Science

A field experiment was conducted to study the effect of rates of nitrogen and muriate and sulfate of potash upon the growth, chemical composition, and quality of the Burley 21 variety of tobacco. Rates of nitrogen applied were 75, 150, 225, and 300 pounds per acre. The muriate and sulfate sources of potash were combined on a equivalent basis in the following proportions: 100 SO₄/0 Cl, 75 SO₄ /25 Cl, 50 SO₄ /50 Cl, 25 SO₄/75 Cl, and 0 SO₄ /100 Cl. The application of nitrogen increased the nitrogen content in the plant during the growing season and of cured leaves, except for the 150 pound rate which decreased the content. Applied nitrogen rates had no effect upon growth or yield above soil derived nitrogen. Chlorine content of growing plants and cured leaves was increased by the addition of 150 pounds of nitrogen. Above 150 pounds, the chlorine content sharply decreased, indicating that anion competition occurred between nitrogen and chlorine ions. The sulfate-chlorine treatments increased the sulfate content as the proportion of sulfate increased and increased chlorine content as the proportion of chlorine increased. The treatments did not significantly alter yield or acre value of cured leaves. / Master of Science

The purpose of these experiments was to simulate the passage of water containing protozoans through the condensers of a steam electric station in order to determine the effects upon colonization of downstream communities. For preliminary tests an apparatus consisting of a test cell constructed of acrylic plastic with a small resistance heater controlled by a variable transformer was developed to deliver a heat shock to protozoans while they were being observed through a microscope. Microthermocouples were used to measure the temperature of the fluid in the cell. Response to rapid increase in temperature was determined for the protozoans Euglena gracilis, Spirostomum ambiguum, Colpidium colpoda, Stentor coeruleus, Tetrahymena pyriformis, and Paramecium multimicronucleatum. Response to several constant temperatures was determined for E. gracilis, S. ambiguum, and C. colpoda. In another experiment, water was pumped from an artificial stream through a copper coil immersed in a hot water bath, to produce a 16 - 26°C increase in temperature. The water then flowed in the same manner into a cold water bath cooling it back to its original temperature. The water was then directed into three plexiglass troughs 79 cm. long, 5 cm. wide, and 7.5 cm. high, before it fell over an end plate 4 cm. high back into the artificial stream. Two control troughs were maintained in an identical manner except for the heat shock. The five communities were sampled weekly and records of diversity (i.e. number of species) in each community and estimates of population density of each species were made. The experiment ran for a period of seven weeks. No significant differences in diversity were observed between control and experimental communities. More subtle differences were noticed, however, which indicated that the heat shock may alter the degree to which incoming species can successfully colonize downstream habitats. / Master of Science

Functional roles of ribosomal proteins (r-proteins) on the structural properties of ribosomes from Pinus lambertiana were studied. For this purpose, r-proteins in the ribosome were dansylated with dansyl chloride (l-dimethylaminonaphthalene-5-sulfonyl chloride) dispersed on celite (DNS-Cl-celite); sedimentation properties, ribonuclease sensitivity, and the temperature-absorbance profile, of the dansylated ribosomes (DNS-ribosomes) were compared with normal ribosomes; the isoelectric focusing patterns of proteins removed (supernatant fraction) during washing procedures and those of proteins remaining (ribosomal pellet fraction) were investigated; characteristics of extracted r-proteins were examined. Ribosomal proteins in the ribosome were dansylated, leaving the r-RNA unreacted. Prepared dansyl ribosomes (DNS-ribosomes) had the same sedimentation patterns as the normal ribosomes. The dissociation and reassociation properties of ribosomes were not altered by the dansylation at various magnesium concentrations. In the temperature-absorbance (260 nm) profiles, dansylation of the ribosome brought about a lowering of the Tm by 2° and a 0.057 increase of the slope of the differentiated melting curve at the Tm. The DNS-ribosome was more sensitive to ribonuclease digestion than the normal ribosome, under all conditions tested. From the above observations, it was concluded that: The DNS-ribosome may be useful in the study of the functional role of r-proteins in the protein synthesis processes; the r-protein may be an important factor for the maintenance of the conformation of the r-RNA in the ribosome; ribosomal proteins may protect the r-RNA from ribonuclease digestion. In the case of normal ribosomes, the 40S subunit was the most sensitive to ribonuclease, while the 80S was the most resistant to the ribonuclease. As the magnesium concentration was lowered, this difference in ribonuclease sensitivity between ribosomal units decreased. More than 20% of the total protein of the crude ribosome could be detached in the washing processes without causing a destruction of the structural integrity of the ribosome as evidenced by sedimentation analysis. Proteins most readily removed were those whose pI's lay in the range of 6.3 - 7.5. The most basic (pI, 8 - 8.5) and the most acidic (pI, 4.5) protein were the least detachable, as shown by the isoelectric focusing patterns of removed proteins. The proteins removed from the ribosomes during each washing process, contained a higher content of acidic amino acids than basic amino acids, whereas the proteins remaining in the ribosome contained a higher content of basic amino acids than acidic amino acids. The neutral pI's associated with the detached proteins, instead of acidic pI's as would have been expected from the amino acid data, were probably due to the presence of many amide groups, as suggested by the high ammonia peaks from these proteins,and the constant ratio of the content of acidic amino acids to ammonia. All of the isoelectric focusing bands, from proteins which were removed during washing (removed protein), corresponded to bands which remained with the ribosomal particle. Previous work had shown that the disc electrophoresis patterns of the removed proteins were different from those proteins remaining in the ribosome. Although the primary structure of the removed proteins are the same as those remaining in the ribosome (same pI values), there may be conformational and aggregational differences between these two groups of proteins (different disc gel bands). This speculation, with the observation that the integrity of the ribosomal structure is not destroyed by the detachment of proteins, may lead to the theory that r-proteins are composed of multiple copies of fundamental subunit proteins, and that the protein component patterns in isoelectric focusing might represent the patterns of pI's of these fundamental subunit proteins. The physicochemical properties of r-proteins in ribosomes might be different depending upon their positions in the ribosome. Characteristics of pine seed r-proteins were typical in their electrophoretic and charge heterogeneity, amino acid composition, sedimentation properties, M̄w, spectrophotometric properties. As NH₂-terminal amino acids, arginine, alanine, and lysine were detected. / Ph. D.

Dissertação (mestrado) - Universidade Federal de Santa Catarina. Centro de Ciencias Humanas / Made available in DSpace on 2012-10-16T04:14:54Z (GMT). No. of bitstreams: 0 / O presente trabalho analisa a atuação do empresariado catarinense vinculado aos ramos têxtil e agroindustrial durante o período 1970-1985, a partir do conceito teórico de "grupos estratégicos". A metodologia empregada consistiu em pesquisa bibliográfica acrescida de levantamentos documentais e de realização de entrevistas. Com base no levantamento documental realizado, fica evidente o favorecimento a ambos setores industriais, quanto à concessão de financiamentos, subsídios e incentivos fiscais oriundos de órgãos públicos de fomento, em detrimento de outros segmentos industriais do estado.

El estudio que realizaremos pretende dar una mirada analítica-reflexiva sobre los aspectos más trascendentales en cuanto a la generación y construcción de una sociedad participativa, es decir, examinaremos los aspectos que llevan a la construcción de poder popular como alternativa revolucionaria. Así, se problematizara sobre el concepto “Poder Popular” en los discursos públicos, dando principal interés a la atingencia discursiva, en cuanto a la lectura del contexto realizada por los partidos políticos de izquierda con la llegada de la Unidad Popular al poder.

Previous research findings indicate that suicide among adolescents was the third leading cause of death in the United States between 1970 through 1980 exceeded only by accidents and homicides. An examination of the trends in youth suicide from 1970 though 1980 by age, race and sex disclosed that there was: (1) a significant difference in youth suicide rates by age, sex and race, and (2) there was a significant difference in method of suicide rates by age and sex. The male suicide rates for both races exceeded female rates. The highest rates of suicide were found among the 20-24 year old males. The 20-24 year old white males had the highest suicide rates. The most frequent method of suicide for males was by firearms and explosives, for females, poisoning by the injection of solid and liquid substances. No difference in method of suicide was found between the two age groups (15-19, 20-24). The major finding was that white males 20-24 were the most vulnerable to suicide; and therefore, the targeted group for suicidal counseling. Societal strains and stresses were probably the greatest for the age groups 20- 24; particularly for white males.

Rastrea las posibles fuentes de las que se nutrió Russell para poder elaborar su conocida paradoja: la teoría conjuntista de Georg Cantor, la fundamentación lógica de la aritmética de Gottlob Frege y el desarrollo histórico de la paradoja de El Mentiroso. Explica el hallazgo de la paradoja de Russell por lo que da cuenta las actividades este filósofo realizaba al formularla. Así, constatamos que Russell estaba intentando solucionar la paradoja de Cantor sobre la cardinalidad del conjunto potencia del conjunto universal. Asimismo, también le hacía frente a la paradoja de Burali-Forti sobre el mayor número ordinal. Sin embargo, a pesar de que Russell no tuvo éxito intentando solucionar estas paradojas matemáticas, consiguió diseñar una paradoja más simple y preocupante: la paradoja de las clases. Da a conocer también las tesis planteadas por Kleene y Kilmister acerca de cómo probablemente Russell procedió a descubrir su paradoja. Expone el impacto que esta paradoja causó en la discusión acerca de los fundamentos de la matemática.

Seminario para optar al grado de Ingeniero Comercial, Mención Economía / Autor no autoriza el acceso a texto completo de su documento / presente trabajo describe y analiza los resultados en materia económica del gobierno de la Unidad Popular durante el período 1970-1973. El enfoque de este análisis es netamente económico, por lo que no profundiza en los aspectos políticos y sociales que también influyeron en el desempeño general de la administración de Salvador Allende. El trabajo se divide en cuatro secciones, en la primera se explica el contexto en que la Unidad Popular asume el poder, su diagnóstico de la economía chilena y sus principales propuestas. En la segunda se presentan las reformas estructurales implementadas bajo el mandato de Allende. En la tercera se describen las políticas de corto plazo del gobierno socialista. Finalmente, en la cuarta parte planteamos nuestras principales conclusiones. Introducción El presente