Relato de experiência: vídeo aula como ferramenta para o ensino química

Anais do II Seminário Seminário Estadual PIBID do Paraná: tecendo saberes / organizado por Dulcyene Maria Ribeiro e Catarina Costa Fernandes — Foz do Iguaçu: Unioeste; Unila, 2014Neste relato de experiência foram utilizadas as vídeo-aulas como uma ferramenta de ensino para abordar conteúdos de química. Estas vídeo-aulas foram elaboradas por bolsistas do PIBID (Programa Institucional de Bolsa de Iniciação a Docência) para sanar dúvidas frequentes dos alunos do Ensino Médio do Colégio Agrícola Estadual Manoel Ribas na cidade de Apucarana, Paraná. A aplicação dos vídeos permitiu um maior entendimento dos alunos diante dos conteúdos, também ficou evidente a maior participação na aula por parte dele

O ensino de equilíbrio químico a partir das etapas da situação de estudo: um relato de caso vivenciado por licenciandos em formação

Resumo: O presente artigo tem como objetivo analisar o desenvolvimento de uma Situação de Estudo (SE) para o ensino de Equilíbrio Químico, evidenciando as potencialidades dessa proposta para os processos de ensino e de aprendizagem na Educação Básica. A SE foi elaborada por dois licenciandos de um curso de Licenciatura em Química e desenvolvida em um colégio da rede pública com a participação de aproximadamente 30 estudantes do 2º ano do Ensino Médio. Dentre as atividades propostas na SE, os estudantes responderam questões relacionadas à situação em estudo, as quais foram coletadas para posterior análise, de acordo com os pressupostos da Análise de Conteúdo. Como resultado, destacamos o envolvimento dos estudantes nas atividades propostas, sendo possível constatar a reelaboração conceitual nas respostas dadas ao longo das aulas, embora alguns estudantes ainda apresentem dificuldades relacionadas à explicação e compreensão dos fenômenos químicos estudados com relação ao nível submicroscópico.Palavras-chave: Estágio Supervisionado; Situação de Estudo; Equilíbrio Químico. A proposition for the teaching of chemical equilibrium from the stages of a study situation: a case report experienced by undergraduate students in trainingAbstract: This study aims to analyze the development of a Study Situation (SS) for the teaching of Chemical Equilibrium, highlighting the potentiality of this proposition for teaching and learning processes in Basic Education. The SS was elaborated by two undergraduate Chemistry students and developed in a state school with the participation of approximately 30 students in their second year of High School. Among the activities proposed in the SS, students answered questions related to the situation under study. These answers were collected for further analysis, according to the assumptions of Content Analysis. As a result, we draw attention to students' involvement in the activities. Although some students still presented difficulties related to the explanation and understanding of the chemical phenomena studied in the submicroscopic level, it was possible to verify the conceptual re-elaboration in the answers given during the classes.Keywords: Supervised Internship; Study Situation; Chemical Equilibrium.

Macro and Micro-Nutrient Accumulation and Partitioning in Soybean Affected by Water and Nitrogen Supply

This study aimed to investigate the influence of water availability and nitrogen fertilization on plant growth, nutrient dynamics, and variables related to soybean crop yield. Trials were performed in Teresina, Piauí, Brazil, using randomized blocks in a split-split plot arrangement. The plots corresponded to water regimes (full and deficient), the split plots to N fertilization (0 and 1000 kg ha-1 N-urea), and the split-split plots to harvest times of soybean plants (16, 23, 30, 37, 44, 58, 65, 79 and 86 days after emergence), with three replicates. In general, the accumulation and partitioning of nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), sulphur (S), copper (Cu), iron (Fe), manganese (Mn), zinc (Zn) and boron (B) were decreased in plants subjected to water deficit and without N fertilization. Although nitrogen fertilization promoted elevated N accumulation in tissues, it did not result in any significant yield gain, and the highest seed yields were found in plants under full irrigation, regardless of N supplementation. However, deficient irrigation decreased the seed oil content of N-fertilized plants. In conclusion, N fertilization is critical for nutrient homeostasis, and water availability impairs biomass and nutrient accumulation, thereby limiting soybean yield performance

Aeromonas spp. IN PRODUCTS OF ANIMAL ORIGIN AND DRINKING WATER OF GOIÂNIA-GO Aeromonas spp. EM PRODUTOS DE ORIGEM ANIMAL E EM ÁGUA DE CONSUMO DE GOIÂNIA - GO

<!-- @page { margin: 2cm } --> <p class="western" align="justify">A total of 53 samples of products from animal origin and drinking water was examined for the presence of <em>Aeromonas spp.</em> <em>Aeromonas</em> occurred in 26.41% (14/53) of the samples. The raw products showed high frequency of contamination and relatively high count Aeromonas hydrophila was the dominating species, 57.5%, being followed of <em>A. veroni</em> (22.5%), <em>A. sobria</em> (17.5%) and <em>A. media</em> (2.5%). None of the <em>Aeromonas spp</em>. was isolated from chlorinated or unchlorinated drinking water.</p> <p class="western" align="justify">KEY-WORDS: <em>Aeromonas</em>; animal origin products; drinking water.</p> <!-- @page { margin: 2cm } --> <p class="western" align="justify">Um total de 53 amostras de produtos de origem animal e água de consumo foi examinado para se verificar a presença de <em>Aeromonas</em> <em>spp</em>. Desse total, 14/53 (26,41%) amostras foram positivas para <em>Aeromonas</em>. Os produtos crus apresentaram maior freqüência de contaminação e contagem relativamente elevadas. A espécie <em>Aeromonas</em> <em>hydrophila</em> foi a mais freqüente (57,5%), seguida pelas espécies <em>A. veroni</em> (22,5%), <em>A. sobria</em> (17,5%) e A. media (2,5%). Nenhuma amostra de água de consumo, clorada ou não clorada, mostrou-se positiva para <em>Aeromonas</em> <em>ssp</em>.</p> <p class="western" align="justify">PALAVRA-CHAVE: <em>Aeromonas</em>; produtos de origem animal; água de consumo.</p&gt

Growth and flowering of colored cotton cultivated in soils of distincts ESP and sheep manure

The inadequate management of irrigation has promoted the increase in the area of degraded soils through salinization and/or sodification, especially in irrigated perimeters of the northeastern semiarid, promoting environmental impacts and decrease in crop yield. In this manner, studies that aim to evaluate the tolerance of crops to salts, and/or techniques that minimize the deleterious effects of salt stress are highly viable. Based on this, the present study aimed to evaluate the influence of sheep manure doses over growth and flowering of the colored cotton cv. BRS Topázio, cultivated in soils with different exchangeable sodium percentages. A randomized block design was adopted, in a 5 x 4 factorial scheme, corresponding to the treatments of five exchangeable sodium percentages – ESP: 8.84, 12.55, 18.80, 28.80 and 38.80% and four sheep manure doses: 0, 5, 10 and 15% based on the volume of the soil, with 3 replications. At 90 days after sowing, it could be verified that the increment in the sheep manure doses added to the soil mitigated the negative effect of the ESP over the production of flower buds, beside stimulating plant growth, flower production and reducing the rate of flower abortion, independently of the ESP. The cotton cv. BRS Topázio is tolerant to soil ESP up to 38.8%, and anthesis is anticipated by the increase in exchangeable sodium

Macro and Micro-Nutrient Accumulation and Partitioning in Soybean Affected by Water and Nitrogen Supply

This study aimed to investigate the influence of water availability and nitrogen fertilization on plant growth, nutrient dynamics, and variables related to soybean crop yield. Trials were performed in Teresina, Piauí, Brazil, using randomized blocks in a split-split plot arrangement. The plots corresponded to water regimes (full and deficient), the split plots to N fertilization (0 and 1000 kg ha−1 N-urea), and the split-split plots to harvest times of soybean plants (16, 23, 30, 37, 44, 58, 65, 79 and 86 days after emergence), with three replicates. In general, the accumulation and partitioning of nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), sulphur (S), copper (Cu), iron (Fe), manganese (Mn), zinc (Zn) and boron (B) were decreased in plants subjected to water deficit and without N fertilization. Although nitrogen fertilization promoted elevated N accumulation in tissues, it did not result in any significant yield gain, and the highest seed yields were found in plants under full irrigation, regardless of N supplementation. However, deficient irrigation decreased the seed oil content of N-fertilized plants. In conclusion, N fertilization is critical for nutrient homeostasis, and water availability impairs biomass and nutrient accumulation, thereby limiting soybean yield performance