La problemática de la evaluación de los aprendizajes en el curso de Patología General : Propuestas para superar la disociación entre enseñanza y evaluación

En el curso de Patología General de la Facultad de Ciencias Veterinarias de la Universidad Nacional de La Plata, se evidencian algunas discordancias entre la metodología de enseñanza y la de evaluación. Los datos recogidos por medio de diferentes estrategias de indagación (entrevistas, encuestas a docentes y ex estudiantes de Patología General) muestran que tanto los docentes como los estudiantes reconocen múltiples dificultades al momento de evaluar y ser evaluado, este resultado nos lleva a pensar si la manera en que se enseña es acorde con la forma en que se evalúa a los estudiantes. Es por esto, que surge la necesidad de elaborar un nuevo instrumento de evaluación para los estudiantes del curso de Patología General con el fin de acercar la enseñanza a la evaluación. La finalidad del presente Trabajo Final Integrador es diseñar colectivamente una propuesta de evaluación integral y participativa de los aprendizajes de los estudiantes del curso de Patología General de la carrera de Ciencias Veterinarias de la Universidad Nacional de La Plata, con el objetivo de incrementar la relación entre la metodología de enseñanza y la metodología de evaluación. La propuesta de innovación planteada se llevó a cabo por medio de encuentros con los docentes del curso de Patología General (jefes de trabajos prácticos y auxiliares diplomados). En estos encuentros se buscó generar un ámbito de discusión y de intercambio de información entre pares con el fin de diseñar, en forma consensuada y colectiva, un nuevo dispositivo de evaluación que sea más acorde a la metodología de enseñanza que se utiliza en el curso de Patología General.Facultad de Ciencias Veterinaria

Disease prevalence and symptoms caused by Alternaria tenuissima and Pestalotiopsis guepinii on blueberry in Entre Ríos and Buenos Aires, Argentina

About 60% of blueberry (Vaccinium corymbosum) plantations in Argentina are located in the provinces of Entre Ríos and Buenos Aires. Alternaria tenuissima and Pestalotiopsis guepinii have been reported as pathogens of blueberry, causing leaf spots and branch cankers. The aims of this research were to estimate the prevalence of these microorganisms on leaves and fruits taken from crops located in Entre Ríos and Buenos Aires, as well as to differentiate leaf symptoms after target inoculations with each pathogen individually and in mixtures. Both fungi were present in blueberry fields from 2010 to 2013. A. tenuissima was the most prevalent pathogen, as most of the symptoms detected in the fields had been caused by this species. As a result of inoculations on cv. O’Neal, injured tissues showed symptoms before undamaged ones. Leaf symptoms caused by A. tenuissima differed from those caused by P. guepinii because of their predominant reddish color and the absence of drop-off of the central part of the lesions. When inoculated in a mixture, incubation period on leaves was intermediate between the registered for individual inoculations. The leaves showed reddishbrown spots typical of A. tenuissima and dark brown spots typical of P. guepinii, both with red margins. Blight, defoliation and canker symptoms caused in each case were undistinguishable.Fil: Fernández, Rocío Belén. Universidad de Buenos Aires. Facultad de Agronomía. Cátedra de Fitopatología; Argentina. Servicio Nacional de Sanidad y Calidad Agroalimentaria; ArgentinaFil: Rivera, Marta Carolina. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Floricultura; Argentina. Universidad de Buenos Aires. Facultad de Agronomía. Cátedra de Fitopatología; ArgentinaFil: Varsallona, Bruno. Universidad de Buenos Aires. Facultad de Agronomía. Cátedra de Fitopatología; ArgentinaFil: Wright, Eduardo Roberto. Universidad de Buenos Aires. Facultad de Agronomía. Cátedra de Fitopatología; Argentin

Current plate boundary deformation of the Afar rift from a 3-D velocity field inversion of InSAR and GPS

Extension, faulting, and magmatism are the main controls on the magnitude and localization of strain at mid‐ocean ridges. However, the temporal and spatial patterns of such processes are not clear since the strain distribution has not been resolved in the past at sufficient spatial resolution and over extended areas. Interferometric synthetic aperture radar (InSAR) and GPS data with unprecedented resolution are now available to us from the Afar rift of Ethiopia. Here we use a velocity field method to combine InSAR and GPS to form the first high‐resolution continuous three‐dimensional velocity field of Afar. We study an area that is 500 km wide and 700 km long, covering three branches of the Afar continental rift and their triple junctions. Our velocity field shows that plate spreading is currently achieved in Afar in contrasting modes. A transient postdiking deformation is focused at the Dabbahu rift segment, while in central Afar, spreading is distributed over several overlapping segments and southern Afar exhibits an interdiking deformation pattern focused at the Asal–Ghoubbet segment. We find that current spreading rates at Dabbahu, following the 2005–2010 intrusions, are up to 110 mm/yr, 6 times larger than the long‐term plate divergence. A segment‐centered uplift of up to 80 mm/yr also occurs, indicating that magma flow is still a primary mechanism of deformation during postdiking. On the other hand, no vertical displacements are currently observed in central and southern Afar, suggesting lack of significant magmatic activity at shallow levels

The fig tree

The Fig Tree was originally conceived and written as a long short story. After May of 195U, both theme and characterization were gradually expanded until the short story had become a novelette. The action of the novelette takes place in the south of France, in a small village just north of Nice. The place is called La Colle sur Loup, but it is always referred to as La Colle by all the inhabitants. My own familiarity with the place is based on the experiences of a single summer in 1949. I have been back only briefly since then, in 1953. In 1952 I wrote a very short story which had as its main theme the rivalry of two families living in that village; it was a completely unsuccessful story, but it was obvious to me that the place had captured my imagination. In the early months of 1954 I wrote the story which was to provide me with the basic framework for the novelette. The idea for the story was reborn after my second visit to the village, and I thought about it all through the fall but was afraid to tackle it, since I had a feeling that it would grow into a "big" thing. My knowledge of La Colle would probably be purely fragmentary were it not for the fact that I have two aunts and their husbands, a grandmother, and now my mother, all living in the village. My aunts' husbands are both fruit farmers, and for some years they would not even speak to each other

Online fantasy sports : an opportunity for women to enter the arenas of sports and technology?

Sports and technology are two male-dominated realms, a characteristic that leaves less room for women to become involved. Fantasy sports, gaining popularity on the Internet, combine sports and technology. This thesis explores the ways online fantasy sports offer a unique playing field for both genders and an opportunity for true equality within that space. This exploration is accomplished through ideological discussion of sports and technology and rhetorical analysis of online fantasy sport websites and other online material by means of sport/gender and feminist theories. Scholars argue that sports and technology influence gender identity development. Male hegemony continues to thrive in sports because of existing stereotypes. Fantasy sports may eliminate many of these stereotypes because they are played online and, thus, certain aspects of the physical world do not apply. Also, trends show the gender gap in technology is decreasing, which disrupts male hegemony, yet technology still remains a male-dominated world. Studies indicate that women exhibit technological competence, yet come across barriers preventing them from becoming involved in computer technologies. The barriers and stereotypes of both technology and sports may be eliminated through knowledge and education, especially by encouraging a conscious awareness of gendered-thinking and the limitations of this thinking. Fantasy sports are currently male-dominated, yet there are few, if any, psychological or physical reasons why women cannot become involved in this activity. The exclusionary rhetoric of many fantasy sport websites hinders the involvement of women because women are often degraded or ridiculed for their interest in sports on certain fantasy sport websites. Yet many women are expressing an interest in fantasy sports, evident through websites such as Femmefan.com. This thesis outlines proposed characteristics of a female-oriented fantasy sport website, which might foster more female participation in fantasy sports. Conscious efforts to promote fantasy sports towards the female population could help decrease the gender gap in sports and technology and provide equality in the fantasy sport environment

Investigation of protein-induced formation of lipid domains and their dynamics using fluorescence energy transfer

An important feature in the current understanding of membrane structure is the existence of lipid domains. Lipid domain formation was observed in an experimental lipid bilayer system containing an equilibrium mixture of glycerophospholipids and raft lipids. Protein-lipid interactions in the equilibrium mixtures were observed when a peripheral membrane peptide was added. These interactions were measured using fluorescence energy transfer. Domain formation as a function of time was also investigated after the protein was added to the equilibrium mixture using stopped-flow fluorescence. Domain formation in vesicles containing 40% anionic lipid occurred in less than 1 s. Domain dissipation was observed with stopped flow fluorescence spectroscopy in glycerophospholipid vesicles as well as in a mixture of glycerophospholipids and raft lipids by removing the peptide. Domain dissipation in vesicles containing glycerophospholipids with 20% anionic lipid occurred in approximately 5 s. Domain dissipation in vesicles containing rafts and 40% anionic lipid occurred in approximately 900 s and domain dissipation in vesicles containing rafts and 10% anionic lipid occurred in approximately 160 s. These timescales were compared to the off-rate of the peptide from the vesicles

Parental marital conflict and youth maladjustment

Linkages between parental reports of marital conflict and youth maladjustment have been established, but less is known about the role of youth's own perceptions of and their involvement in parental marital conflict. Drawing on family systems and social learning perspectives, a primary goal of this study was to examine the association among three indicators of parental marital conflict and both youth maladjustment and sibling conflict. The three measures of marital conflict examined here included: 1) parental and 2) youth reports of the frequency of parental marital conflict and 3) youth reports of their involvement in parental marital conflict. A secondary goal of this study was to test whether linkages between parental marital conflict and outcomes differed by age and sex. Data came from 165 youth, ages 9 to 18 years old (M = 11.6, SD = 2.0). Hierarchical regression analyses in STATA were used to test all study hypotheses. Results indicated that none of the marital conflict variables were associated with maternal reports of maladjustment when common covariates of both marital conflict and youth adjustment (i.e., maternal depressive symptoms and parent-child relationship) had been taken into account. Youth-report of parental marital conflict was associated with youth reports of maladjustment. Furthermore, both maternal and youth reports of marital conflict explained significant variance in sibling conflict. Assessing youth reports of marital conflict over and above parental reports of marital conflict may further help understand associations between parental marital conflict and both youth adjustment and relationship qualities

Art as idolatry or sacred possibility : a hermeneutic study of art education

This investigation focuses on the problems of viewing education in the visual arts through a technological curricular framework that limits human potential and on the possibilities presented by expanding the art educator 1 s view of curricular decision-making through appropriating a moral aesthetic. Particular emphasis is given to the way a wholistic rationale honors both the dialectic between self and society and that between the self and one's sense of what it means to be fully human. A hermeneutic methodology (Ricoeur, 1978a) based upon this dual dialectic (Macdonald, 1978b) is used for this study because it allows the author to develop greater understanding of how a teacher's personal and professional realities are socially constructed (Berger & Luckmann, 1967) and how a critical and imaginative consciousness (Macdonald & Purpel, 1987) of this process might develop the necessary sense of agency for meeting her social responsibilities as an art educator

Rapid and improved assay of surfactins from Bacillus subtilis, 203R via UPLC-ESI-MS

To better bridge research with commercialization, this project sought to develop an improved analytical method for the assay of biosurfactants known as surfactins from Bacillus subtilis. We sought to compare levels of production from various strains of B. subtilis, including strain 203R, which was isolated from areas prone to oil degraders. The use of Ultra-Performance Liquid Chromatography coupled with High Resolution Mass Spectrometry proved beneficial for the selective identification and quantification of surfactin lipopeptides. Surfactins were eluted in under 10 minutes and quantified using the total area of generated ions. Near baseline separation across the envelope gave an added layer of identification to the ions responsible for surfactins. These lipopeptides, having similar molecular masses to the iturins, nearly coelute complicating the analysis. By coupling retention time with fragmentation pattern, some isoforms could be distinguished. Validation of the method was achieved by obtaining 4 calibration curves on different days and applying linear regression analysis. Strain 203R was shown to be a superior producer of surfactins than the previously reported model strain ATCC 21332

The pursuit of chemical diversity in fungi

Fungi are ever changing their secondary metabolites profile in order to adapt to their environment. Previously characterized fungal cultures were re-analyzed with the intention of re-isolating scaled up quantities of metabolites of interest. However, in doing so there were several instances where fungal secondary metabolites were isolated that were not previously observed. The biological activities of the isolated secondary metabolites were evaluated using a variety of bioassays. Three compounds that were not previously isolated were characterized and added to our compound library. Re-isolation and re-analysis of fungal secondary metabolites can lead to the discovery of unsought yet interesting changes in secondary metabolite profile and biological activity. To take advantage of fungi’s ability to adapt to their environment, our lab has grown fungi in co-culturing experiments in hopes of activating silent biosynthetic gene clusters thus diversifying secondary metabolite production. The most common fungus utilized in these experiments has been Xylaria flabelliformis (formerly known as Xylaria cubensis) due to its production of the fungistatic compound and FDA approved drug, griseofulvin. In this study, two other Xylaria spp. are analyzed in comparison to Xylaria flabelliformis to determine variation in griseofulvin production among the strains and over time. Characterizing griseofulvin production by various Xylaria spp. leads to intentionality in future co-culturing experimental design, in that the optimal Xylaria sp. can be selected