A magnanimidade da teoria: interpretar a ética em teoria da literatura

Tese de doutoramento, Teoria da Literatura, Universidade de Lisboa, Faculdade de Letras, 2003

O significado do trabalho com o texto dissertativo-argumentativo escrito em sala de aula

Pós-graduação em Educação - FFC

Savitri y Orfeo : La argumentación en la lógica india y en la retórica clásica

Los mitos de Savitri (Mahabharata 3.293-299) y Orfeo (Ovidio. Metamorfosis 10.1-85), pertenecientes al ámbito cultural indoeur opeo, presentan algunos puntos en común: narran la historia del amante que rescata a su ser amado de la muerte, y combinan el encuentro con los dioses de la muerte y el discurso mediante el poder de la palabra. En esta propuesta, se analizan los discursos de los protagonistas a partir de las convenciones propias de cada contexto de enunciación. Para el caso indio, se sigue el modelo lógico de la escuela Nyaya; para el greco-latino, el de la retórica clásica. De este modo, sobre la base de la estructura argumentativa del silogismo aristotélico, se plantean dos variaciones, respectivamente, el silogismo hindú y el silogismo retórico. Se trata de dos aproximaciones argumentativas con métodos distintos pero con un mismo fin: (con)vencer al oponente

Savitri y Orfeo : La argumentación en la lógica india y en la retórica clásica

Los mitos de Savitri (Mahabharata 3.293-299) y Orfeo (Ovidio. Metamorfosis 10.1-85), pertenecientes al ámbito cultural indoeur opeo, presentan algunos puntos en común: narran la historia del amante que rescata a su ser amado de la muerte, y combinan el encuentro con los dioses de la muerte y el discurso mediante el poder de la palabra. En esta propuesta, se analizan los discursos de los protagonistas a partir de las convenciones propias de cada contexto de enunciación. Para el caso indio, se sigue el modelo lógico de la escuela Nyaya; para el greco-latino, el de la retórica clásica. De este modo, sobre la base de la estructura argumentativa del silogismo aristotélico, se plantean dos variaciones, respectivamente, el silogismo hindú y el silogismo retórico. Se trata de dos aproximaciones argumentativas con métodos distintos pero con un mismo fin: (con)vencer al oponente

Savitri y Orfeo : La argumentación en la lógica india y en la retórica clásica

Los mitos de Savitri (Mahabharata 3.293-299) y Orfeo (Ovidio. Metamorfosis 10.1-85), pertenecientes al ámbito cultural indoeur opeo, presentan algunos puntos en común: narran la historia del amante que rescata a su ser amado de la muerte, y combinan el encuentro con los dioses de la muerte y el discurso mediante el poder de la palabra. En esta propuesta, se analizan los discursos de los protagonistas a partir de las convenciones propias de cada contexto de enunciación. Para el caso indio, se sigue el modelo lógico de la escuela Nyaya; para el greco-latino, el de la retórica clásica. De este modo, sobre la base de la estructura argumentativa del silogismo aristotélico, se plantean dos variaciones, respectivamente, el silogismo hindú y el silogismo retórico. Se trata de dos aproximaciones argumentativas con métodos distintos pero con un mismo fin: (con)vencer al oponente

Estructuras argumentativas de estudiantes para profesores de matemáticas en un entorno en linea

El objetivo de esta investigación fue estudiar cómo aprenden estudiantes para profesores de educación secundaria a analizar la enseñanza de las matemáticas como un aspecto del desarrollo de su competencia docente. Para ello, analizamos la estructura argumentativa de una discusión en línea entre estudiantes para profesores de enseñanza secundaria cuando están identificando e interpretando aspectos de la comunicación matemática como un rasgo característico de la enseñanza de las matemáticas. Para realizar el análisis, usamos el esquema de un argumento de Toulmin y centramos nuestra atención en cómo los estudiantes para profesor establecían la relación entre las conclusiones y los datos y cómo usaban las garantías. Los resultados muestran tres características de las estructuras argumentativas generadas por los estudiantes para profesor en un debate en línea que determinan oportunidades para el aprendizaje de la competencia docente “mirar con sentido” la enseñanza de las matemáticas: refinar garantías para apoyar una conclusión, discutir sobre cómo se debe establecer una conclusión para que sea admitida, y poner en duda las conclusiones.

A DIALÉTICA DO DESESPERO EM KIERKEGAARD E SUA INFLUÊNCIA SOBRE O CONCEITO DE ALIENAÇÃO EM PAUL TILLICH

A respectiva pesquisa procurou estabelecer a relação de influência da filosofia de Søren Kierkegaard sobre a construção teológica de Paul Tillich. Para tanto, utilizamos como pano de fundo ou estrutura argumentativa o conceito de Desespero humano de Kierkegaard, comparando-o ao conceito de Alienação do ser de Tillich. Objetivamos com isso, demonstrar o entrelaçamento dialogal composto no desenvolvimento da chamada doutrina do pecado em ambos os autores. Isto é, como o desdobramento da antropologia kierkegaardiana problematizou os fundamentos da teologia sistemática, sobretudo, na questão da harmatiologia, e, como esta mesma problematização, foi capaz de padronizar o modus operandi que determinou a elaboração feita por Tillich sobre o mesmo assunto. Obviamente, que, no decorrer dessa investigação, não se pretendeu desqualificar ou eliminar a originalidade dos autores, nem tampouco transformar seus argumentos em uma espécie de amálgama conceitual. Assim, antes de uma suposta crítica de ter se proposto uma fusão arbitrária de ideias, buscamos, mais uma vez apontar, soluções de dialéticas e centros comuns, que apontem para aqueles elementos de convergência, aonde de fato, o diálogo é possível.

Argument structures in Chinese university students’ argumentative writing: a contrastive study

Situated within a Systemic Functional Linguistics genre paradigm, this study adopted a function-based linguistic approach to examine the argument structures in English writing produced by Chinese university students of English as foreign language (EFL). Their English writing was contrasted with three other sets of argumentative essays in order to explore differences and similarities in the use of argument structures. The four sets of essays were produced by three groups of university students: native English- and Chinese-speaking university students and Chinese university EFL students. Participants’ interviews and questionnaire responses were also collected. The study found that most native English-speaking participants used an analytical arguing strategy, while most Chinese-speaking university participants preferred a hortatory argument structure both in their English and Chinese writing. It was also found that Chinese participants’ English writing was influenced by both English and Chinese.

Examining argumentative coherence in essays by undergraduate students of English as a foreign language in Mainland China and their English speaking peers in the United States

I conducted this study to provide insights toward deepening understanding of association between culture and writing by building, assessing, and refining a conceptual model of second language writing. To do this, I examined culture and coherence as well as the relationship between them through a mixed methods research design. Coherence has been an important and complex concept in ESL/EFL writing. I intended to study the concept of coherence in the research context of contrastive rhetoric, comparing the coherence quality in argumentative essays written by undergraduates in Mainland China and their U.S. peers. In order to analyze the complex concept of coherence, I synthesized five linguistic theories of coherence: Halliday and Hasan's cohesion theory, Carroll's theory of coherence, Enkvist's theory of coherence, Topical Structure Analysis, and Toulmin's Model. Based upon the synthesis, 16 variables were generated. Across these 16 variables, Hotelling t-test statistical analysis was conducted to predict differences in argumentative coherence between essays written by two groups of participants. In order to complement the statistical analysis, I conducted 30 interviews of the writers in the studies. Participants' responses were analyzed with open and axial coding. By analyzing the empirical data, I refined the conceptual model by adding more categories and establishing associations among them. The study found that U.S. students made use of more pronominal reference. Chinese students adopted more lexical devices of reiteration and extended paralleling progression. The interview data implied that the difference may be associated with the difference in linguistic features and rhetorical conventions in Chinese and English. As far as Toulmin's Model is concerned, Chinese students scored higher on data than their U.S. peers. According to the interview data, this may be due to the fact that Toulmin's Model, modified as three elements of arguments, have been widely and long taught in Chinese writing instruction while U.S. interview participants said that they were not taught to write essays according to Toulmin's Model. Implications were generated from the process of textual data analysis and the formulation of structural model defining coherence. These implications were aimed at informing writing instruction, assessment, peer-review, and self-revision.

Changes In Chromatin Structure In Nih 3t3 Cells Induced By Valproic Acid And Trichostatin A.

Valproic acid (VPA) and trichostatin A (TSA) are known histone deacetylase inhibitors (HDACIs) with epigenetic activity that affect chromatin supra-organization, nuclear architecture, and cellular proliferation, particularly in tumor cells. In this study, chromatin remodeling with effects extending to heterochromatic areas was investigated by image analysis in non-transformed NIH 3T3 cells treated for different periods with different doses of VPA and TSA under conditions that indicated no loss of cell viability. Image analysis revealed chromatin decondensation that affected not only euchromatin but also heterochromatin, concomitant with a decreased activity of histone deacetylases and a general increase in histone H3 acetylation. Heterochromatin protein 1-α (HP1-α), identified immunocytochemically, was depleted from the pericentromeric heterochromatin following exposure to both HDACIs. Drastic changes affecting cell proliferation and micronucleation but not alteration in CCND2 expression and in ratios of Bcl-2/Bax expression and cell death occurred following a 48-h exposure of the NIH 3T3 cells particularly in response to higher doses of VPA. Our results demonstrated that even low doses of VPA (0.05 mM) and TSA (10 ng/ml) treatments for 1 h can affect chromatin structure, including that of the heterochromatin areas, in non-transformed cells. HP1-α depletion, probably related to histone demethylation at H3K9me3, in addition to the effect of VPA and TSA on histone H3 acetylation, is induced on NIH 3T3 cells. Despite these facts, alterations in cell proliferation and micronucleation, possibly depending on mitotic spindle defects, require a longer exposure to higher doses of VPA and TSA.

Matrix Metalloproteinases And Left Ventricular Function And Structure In Spinal Cord Injured Subjects.

Subjects with spinal cord injury (SCI) exhibit impaired left ventricular (LV) diastolic function, which has been reported to be attenuated by regular physical activity. This study investigated the relationship between circulating matrix metalloproteinases (MMPs) and tissue inhibitors of MMPs (TIMPs) and echocardiographic parameters in SCI subjects and the role of physical activity in this regard. Forty-two men with SCI [19 sedentary (S-SCI) and 23 physically-active (PA-SCI)] were evaluated by clinical, anthropometric, laboratory, and echocardiographic analysis. Plasmatic pro-MMP-2, MMP-2, MMP-8, pro-MMP-9, MMP-9, TIMP-1 and TIMP-2 levels were determined by enzyme-linked immunosorbent assay and zymography. PA-SCI subjects presented lower pro-MMP-2 and pro-MMP-2/TIMP-2 levels and improved markers of LV diastolic function (lower E/Em and higher Em and E/A values) than S-SCI ones. Bivariate analysis showed that pro-MMP-2 correlated inversely with Em and directly with E/Em, while MMP-9 correlated directly with LV mass index and LV end-diastolic diameter in the whole sample. Following multiple regression analysis, pro-MMP-2, but not physical activity, remained associated with Em, while MMP-9 was associated with LV mass index in the whole sample. These findings suggest differing roles for MMPs in LV structure and function regulation and an interaction among pro-MMP-2, diastolic function and physical activity in SCI subjects.

Growth Factor Stimulation Improves The Structure And Properties Of Scaffold-free Engineered Auricular Cartilage Constructs.

The reconstruction of the external ear to correct congenital deformities or repair following trauma remains a significant challenge in reconstructive surgery. Previously, we have developed a novel approach to create scaffold-free, tissue engineering elastic cartilage constructs directly from a small population of donor cells. Although the developed constructs appeared to adopt the structural appearance of native auricular cartilage, the constructs displayed limited expression and poor localization of elastin. In the present study, the effect of growth factor supplementation (insulin, IGF-1, or TGF-β1) was investigated to stimulate elastogenesis as well as to improve overall tissue formation. Using rabbit auricular chondrocytes, bioreactor-cultivated constructs supplemented with either insulin or IGF-1 displayed increased deposition of cartilaginous ECM, improved mechanical properties, and thicknesses comparable to native auricular cartilage after 4 weeks of growth. Similarly, growth factor supplementation resulted in increased expression and improved localization of elastin, primarily restricted within the cartilaginous region of the tissue construct. Additional studies were conducted to determine whether scaffold-free engineered auricular cartilage constructs could be developed in the 3D shape of the external ear. Isolated auricular chondrocytes were grown in rapid-prototyped tissue culture molds with additional insulin or IGF-1 supplementation during bioreactor cultivation. Using this approach, the developed tissue constructs were flexible and had a 3D shape in very good agreement to the culture mold (average error <400 µm). While scaffold-free, engineered auricular cartilage constructs can be created with both the appropriate tissue structure and 3D shape of the external ear, future studies will be aimed assessing potential changes in construct shape and properties after subcutaneous implantation.

Ssr-based Genetic Diversity And Structure Of Garlic Accessions From Brazil.

Garlic is a spice and a medicinal plant; hence, there is an increasing interest in 'developing' new varieties with different culinary properties or with high content of nutraceutical compounds. Phenotypic traits and dominant molecular markers are predominantly used to evaluate the genetic diversity of garlic clones. However, 24 SSR markers (codominant) specific for garlic are available in the literature, fostering germplasm researches. In this study, we genotyped 130 garlic accessions from Brazil and abroad using 17 polymorphic SSR markers to assess the genetic diversity and structure. This is the first attempt to evaluate a large set of accessions maintained by Brazilian institutions. A high level of redundancy was detected in the collection (50 % of the accessions represented eight haplotypes). However, non-redundant accessions presented high genetic diversity. We detected on average five alleles per locus, Shannon index of 1.2, HO of 0.5, and HE of 0.6. A core collection was set with 17 accessions, covering 100 % of the alleles with minimum redundancy. Overall FST and D values indicate a strong genetic structure within accessions. Two major groups identified by both model-based (Bayesian approach) and hierarchical clustering (UPGMA dendrogram) techniques were coherent with the classification of accessions according to maturity time (growth cycle): early-late and midseason accessions. Assessing genetic diversity and structure of garlic collections is the first step towards an efficient management and conservation of accessions in genebanks, as well as to advance future genetic studies and improvement of garlic worldwide.

The Atomic Structure Of A Bare Buffer Layer On Sic(0001) Chemically Resolved.

A chemical-specific photoelectron diffraction structure determination of a carbon rich buffer layer on SiC is reported. In addition to the long-range ripple of this surface, a local buckling in the hexagonal sublattice, which breaks the local range order symmetry, was unraveled.

Crystal Structure Of (3e)-3-[(4-nitro-phen-oxy)-meth-yl]-4-phenyl-but-3-en-2-one.

In the title compound, C17H15NO4, the conformation about the C=C double bond [1.348 (2) Å] is E with the ketone group almost co-planar [C-C-C-C torsion angle = 7.2 (2)°] but the phenyl group twisted away [C-C-C-C = 160.93 (17)°]. The terminal aromatic rings are almost perpendicular to each other [dihedral angle = 81.61 (9)°] giving the mol-ecule an overall U-shape. The crystal packing feature benzene-C-H⋯O(ketone) contacts that lead to supra-molecular helical chains along the b axis. These are connected by π-π inter-actions between benzene and phenyl rings [inter-centroid distance = 3.6648 (14) Å], resulting in the formation of a supra-molecular layer in the bc plane.