918 resultados para nonylphenol (NP)
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O propósito deste trabalho é apresentar um estudo do início daaquisição do português como segunda língua por três crianças de umacomunidade de nipo-brasileiros do Brasil. Até a idade escolar, fase em quecomeça a aquisição do português, estas crianças falam unicamente o japonêscomo língua materna. Com base no modelo de princípios e parâmetrosda teoria da gramática gerativa (Chomsky, 1981), foi tomado comoobjeto de estudo um fenômeno sintático que diferencia o japonês do português:o parâmetro da linearidade (isto é, ordem das palavras), o qual estabelecepara o japonês o núcleo sintagmático em posição final (head-last) epara o português, em posição inicial (head-first). Valendo-me dos estudossobre language transfer (Odlin, 1989), mostro que, nesta fase da aquisição,as crianças, na produção de sintagmas nominais (NP -> N + complemento),transferem o parâmetro head-last do japonês para o português. As evidênciasmostradas neste trabalho contrariam alguns estudos que negam aexistência de transfer (Dulay & Burt, 1974; Dulay et al., 1982), sobretudono nível sintático (Felix, 1978; Genesee et al., 1995; Paradis & Genesee,1996).
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Pós-graduação em Ciências Biológicas (Farmacologia) - IBB
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Pós-graduação em Ciências Biológicas (Botânica) - IBB
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The efficiency of sources used for soil acidity correction depends on reactivity rate (RR) and neutralization power (NP), indicated by effective calcium carbonate (ECC). Few studies establish relative efficiency of reactivity (RER) for silicate particle-size fractions, therefore, the RER applied for lime are used. This study aimed to evaluate the reactivity of silicate materials affected by particle size throughout incubation periods in comparison to lime, and to calculate the RER for silicate particle-size fractions. Six correction sources were evaluated: three slags from distinct origins, dolomitic and calcitic lime separated into four particle-size fractions (2, 0.84, 0.30 and <0.30-mm sieves), and wollastonite, as an additional treatment. The treatments were applied to three soils with different texture classes. The dose of neutralizing material (calcium and magnesium oxides) was applied at equal quantities, and the only variation was the particle-size material. After a 90-day incubation period, the RER was calculated for each particle-size fraction, as well as the RR and ECC of each source. The neutralization of soil acidity of the same particle-size fraction for different sources showed distinct solubility and a distinct reaction between silicates and lime. The RER for slag were higher than the limits established by Brazilian legislation, indicating that the method used for limes should not be used for the slags studied here.
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Pós-graduação em Biologia Geral e Aplicada - IBB
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Pós-graduação em Microbiologia Agropecuária - FCAV
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Pós-graduação em Agronomia (Energia na Agricultura) - FCA
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Pós-graduação em Agronomia (Entomologia Agrícola) - FCAV
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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This study evaluated the effect on micro-tensile bond strength (mu-TBS) of laser irradiation of etched/unetched dentin through an uncured self-etching adhesive. Dentinal surfaces were treated with Clearfil SE Bond Adhesive (CSE) either according to the manufacturer's instructions (CSE) or without applying the primer (CSE/NP). The dentin was irradiated through the uncured adhesive, using an Nd: YAG laser at 0.75 or 1 W power settings. The adhesive was cured, composite crowns were built up, and the teeth were sectioned into beams (0.49 mm(2)) to be stressed under tension. Data were analyzed using one-way ANOVA and Tukey statistics (alpha = 5%). Dentin of the fractured specimens and the interfaces of untested beams were observed under scanning electron microscopy (SEM). The results showed that non-etched irradiated surfaces presented higher mu-TBS than etched and irradiated surfaces (p < 0.05). Laser irradiation alone did not lead to differences in mu-TBS (p > 0.05). SEM showed solidification globules on the surfaces of the specimens. The interfaces were similar on irradiated and non-irradiated surfaces. Laser irradiation of dentin through the uncured adhesive did not lead to higher mu-TBS when compared to the suggested manufacturer's technique. However, this treatment brought benefits when performed on unetched dentin, since bond strengths were higher when compared to etched dentin.
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)