As crianças protagonistas dos contos de fadas dos Irmãos Grimm

The origins of the fairy tales are lost in the past but these tales are, even today, great teaching instruments because they relate to language development, creativity, social relations, and especially with the internalization of values and behavior patterns. According to Bettelheim (1980), fairy tales assure the children that the difficulties can be overcome, no matter how insignificant they feel. In this sense, these tales are power tools. We understand that fairy tales - and their characters - have the power to influence their readers/listeners. Therefore, this study considered four fairy tales in which the protagonists are children and remain as children all though the narratives: Little Red Riding Hood, Hansel and Gretel Snow White and Rose Red and Thumbling, from Grimm Tales, translated into Portuguese by David Jardim Junior and published in 2008 by Itatiaia. We sought investigate how the children characters of these stories act, leveraging a reflection grounded on the image of children that emerge from the selected tales - images that have been registered in the first decades of the nineteenth century by the Brothers Grimm in their Children's and Household Tales - enabling the identification of the kinds of behavior that they perform and the values they embody, thus contributing to a better understanding of the models that these characters offer to the twenty-first century's children. Our research has a qualitative approach of bibliographic nature, mainly grounded in the ideas of Bettelheim (1980) and Ariès (1981). We found that there is a shortage of studies on the tales collected/maintained by the Brothers Grimm, although these stories have become classics of universal children's literature and continue, cradling the imagination of Western children in the twenty-first century. We also verified that there are very few studies exploring the representation of children in fairy tales and children's literature...

Interação entre irmãos em situação de cuidados formais

Este trabalho teve como objetivo descrever as principais características de famílias onde os filhos mais velhos são responsabilizados pela execução das tarefas domésticas e pelo cuidado aos irmãos menores, durante a ausência dos pais. Participaram deste estudo vinte famílias residentes à Vila Paranoá, Distrito Federal, com filhos de um a dezesseis anos de idade. Os dados foram colhidos através de entrevistas e sessões de observação sistemática do comportamento em ambiente natural, realizadas durante o período de almoço. A análise se deteve na organização familiar, desempenho em tarefas domésticas e interação entre irmãos, tendo sido possível classificar as famílias em três grupos qualitativamente distintos. Os resultados são discutidos em termos da necessidade de se considerar fatores de ordem social na análise do grupo familiar.

Propagação vegetativa de progênies de meios-irmãos de angico-vermelho (Anadenanthera macrocarpa (Benth) Brenan) por miniestaquia

Objetivou-se com o presente estudo avaliar a eficiência da técnica de miniestaquia na propagação vegetativa de progênies de meios-irmãos de angico-vermelho (Anadenanthera macrocarpa (Benth) Brenan) quanto à produção de brotações e sobrevivência das minicepas, enraizamento das miniestacas apicais e intermediárias tratadas com diferentes doses do AIB (0; 2.000; 4.000 e 6.000 mg L-1), assim como determinar a velocidade de enraizamento em casa de vegetação. As minicepas foram obtidas a partir de mudas produzidas via sementes de seis progênies de meios-irmãos de angico-vermelho. Com base nos resultados obtidos, as minicepas apresentaram produtividade de 1,2 a 3,7 miniestacas/minicepa/coleta e sobrevivência de 84% a 98% ao longo das seis coletas realizadas. As miniestacas apicais foram superiores em relação às intermediárias, com maior predisposição ao enraizamento, no entanto o AIB não teve efeito significativo sobre o enraizamento das progênies estudadas. Quanto à velocidade de enraizamento, os resultados indicaram variação entre as progênies.

Nuovi copolimeri triblocco biodegradabili a base di PLA per imballaggi alimentari

Nella presente Tesi si procede alla preparazione e caratterizzazione di nuovi poliesteri alifatici a base di PLLA che offrano garanzie di completa biodegradabilità e presentino caratteristiche chimico/fisiche adeguate ad applicazioni nell’ambito dell’imballaggio alimentare. La modifica chimica del PLLA è stata realizzata per introduzione in catena di segmenti opportunamente sintetizzati che fungono da iniziatori nell’apertura dell’anello di lattide nella ROP. I copolimeri triblocco, poli(lattico)-block-poli(propilene/neopentil glicole succinato) PLLAnP(PS80NS20)m, si differenziano per il diverso rapporto in peso tra i due diversi tipi di blocco, quello hard di PLLA e quello soft di P(PS80NS20). I risultati ottenuti sono di rilevante interesse applicativo: i copolimeri presentano migliorate proprietà meccaniche rispetto al PLLA, una maggiore velocità di biodegradazione, senza che abbia avuto luogo un peggioramento della stabilità termica e delle proprietà barriera, addirittura migliore al gas test O2.

Scale Up of PLA Nanoparticle Synthesis by Solvent Displacement and Functionalization of the Particles with a Silica Shell for Targeted Drug Delivery Applications

Biodegradable polymer nanoparticles have the properties necessary to address many of the issues associated with current drug delivery techniques including targeted and controlled delivery. A novel drug delivery vehicle is proposed consisting of a poly(lactic acid) nanoparticle core, with a functionalized, mesoporous silica shell. In this study, the production of PLA nanoparticles is investigated using solvent displacement in both a batch and continuous manner, and the effects of various system parameters are examined. Using Pluronic F-127 as the stabilization agent throughout the study, PLA nanoparticles are produced through solvent displacement with diameters ranging from 200 to 250 nm using two different methods: dropwise addition and in an impinging jet mixer. The impinging jet mixer allows for easy scale-up of particle production. The concentration of surfactant and volume of quench solution is found to have minimal impact on particle diameter; however, the concentration of PLA is found to significantly impact the diameter mean and polydispersity. In addition, the stability of the PLA nanoparticles is observed to increase as residual THF is evaporated. Lastly, the isolated PLA nanoparticles are coated with a silica shell using the Stöber Process. It is found that functionalizing the silica with a phosphonic silane in the presence of excess Pluronic F-127 decreases coalescence of the particles during the coating process. Future work should be conducted to fine-tune the PLA nanoparticle synthesis process by understanding the effect of other system parameters and in synthesizing mesoporous silica shells.

The Crystallization Kinetics of Polylactic Acid (Pla) Processed Through Solid-State/Melt Extrusion

Polylactic acid (PLA) is a bio-derived, biodegradable polymer with a number of similar mechanical properties to commodity plastics like polyethylene (PE) and polyethylene terephthalate (PETE). There has recently been a great interest in using PLA to replace these typical petroleum-derived polymers because of the developing trend to use more sustainable materials and technologies. However, PLA¿s inherent slow crystallization behavior is not compatible with prototypical polymer processing techniques such as molding and extrusion, and in turn inhibits its widespread use in industrial applications. In order to make PLA into a commercially-viable material, there is a need to process the material in such a way that its tendency to form crystals is enhanced. The industry standard for producing PLA products is via twin screw extrusion (TSE), where polymer pellets are fed into a heated extruder, mixed at a temperature above its melting temperature, and molded into a desired shape. A relatively novel processing technique called solid-state shear pulverization (SSSP) processes the polymer in the solid state so that nucleation sites can develop and fast crystallization can occur. SSSP has also been found to enhance the mechanical properties of a material, but its powder output form is undesirable in industry. A new process called solid-state/melt extrusion (SSME), developed at Bucknell University, combines the TSE and SSSP processes in one instrument. This technique has proven to produce moldable polymer products with increased mechanical strength. This thesis first investigated the effects of the TSE, SSSP, and SSME polymer processing techniques on PLA. The study seeks to determine the process that yields products with the most enhanced thermal and mechanical properties. For characterization, percent crystallinity, crystallization half time, storage modulus, softening temperature, degradation temperature and molecular weight were analyzed for all samples. Through these characterization techniques, it was observed that SSME-processed PLA had enhanced properties relative to TSE- and SSSP-processed PLA. Because of the previous findings, an optimization study for SSME-processed PLA was conducted where throughput and screw design were varied. The optimization study determined PLA processed with a low flow rate and a moderate screw design in an SSME process produced a polymer product with the largest increase in thermal properties and a high retention of polymer structure relative to TSE-, SSSP-, and all other SSME-processed PLA. It was concluded that the SSSP part of processing scissions polymer chains, creating defects within the material, while the TSE part of processing allows these defects to be mixed thoroughly throughout the sample. The study showed that a proper SSME setup allows for both the increase in nucleation sites within the polymer and sufficient mixing, which in turn leads to the development of a large amount of crystals in a short period of time.

Nueva mímesis, imágenes y otredades en Intemperie, de Roger Pla

Escrita entre 1966 y 1969 y publicada en 1973 por Emecé en Argentina y Círculo de lectores en España, Intemperie es una de las más importantes narraciones de Roger Pla (1912-1982) y una de las más notables novelas argentinas de la década de 1970-1980. Además, fue finalista en el prestigioso Premio Seix Barral, edición de 1969, en la época del esplendor del Boom y del Postboom. Poco conocida por la crítica académica, Intemperie fue también un éxito de lectores al momento de la edición, notable aspecto porque es, al mismo tiempo, un texto complejo y experimental que deconstruye tiempo y espacio para construir nuevas ideas, imágenes y perspectivas acerca de una posible realidad total. Este ensayo examina diferentes aspectos clave en relación a características experimentales y tópicas de Intemperie, incluyendo la influencia de las artes visuales en la estética de la novela, el tema de la Otredad y el posible valor de aquella obra literaria en el desarrollo del sistema literario argentino.