VACINAÇÃO EM DEBATE: UMA PROPOSTA DE ENSINO INVESTIGATIVO COM ESTUDANTES DO 7º ANO DO ENSINO FUNDAMENTAL

This paper presents the evaluation of an Inquiry-Based Sequence Teaching (IBST) within the perspective of teaching by research and group work, where the content to be taught was based on the context of the argumentation about vaccination. The class was motivated by a central question: "How does vaccination interfere in public health?". The initial responses were analyzed before the exploratory activity, followed by the validated hypotheses collectively provided for the solution of the problem situation. At the end, the students answered the central question again by constructing a collective systematization text based on the arguments used in class. It was observed that, through the discursive interactions performed among students and teacher-students, the students were able to validate hypotheses that were associated with the context of the activity performed, as well as broadened their answers to the central question, associating it with the arguments used in the class. Teaching by research associated with group work generated a favorable environment for the proposition and validation of arguments in a contextualized way, contributing to the development of the EF07CI10-C skill proposed by BNCC.Este trabalho consiste na avaliação de uma Sequência de Ensino Investigativa (SEI) na perspectiva do ensino por investigação e do trabalho em grupo, onde os conteúdos trabalhados situam-se no contexto das argumentações sobre a vacinação. A SEI foi motivada pela pergunta central: “Como a vacinação interfere na saúde coletiva?” e o estudo analisou as respostas iniciais dos alunos do 7º ano do ensino fundamental antes da atividade exploratória, seguidas das hipóteses validadas fornecidas coletivamente para a solução da situação-problema. Ao final, os alunos responderam novamente à pergunta central por meio da construção de um texto de sistematização coletivo, com base nos argumentos partilhados em aula. Observou-se que, por intermédio das interações discursivas realizadas entre os alunos e alunos-professora, os estudantes foram capazes de validar hipóteses que estavam associadas ao contexto da atividade executada, bem como ampliaram suas respostas à pergunta central, relacionando-as com os argumentos utilizados na aula. A abordagem investigativa associada ao trabalho em grupo gerou um ambiente favorável para a proposição e validação de argumentos de forma contextualizada, contribuindo para o desenvolvimento da habilidade EF07CI10-C proposta pela BNCC

Study of Biodiesel Production from Sunflower Oil Using Non Usual Basic Polymeric Resin as Catalyst

Biodiesel is defined as a long-chain mono alkyl (methyl, ethyl or propyl) ester of fatty acids obtained from renewable sources by transesterification reaction using an acid or base. In this work, a basic resin, Amberlyst A26, was used to produce methyl sunflower biodiesel. The iodine value, corrosion to copper, oxidative stability, specific mass, water content, acid value, cloud point and ester composition were evaluated. The heterogeneous catalyst was also characterized to verify its efficiency and its ability to be reused. We used the following analytical techniques: scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-rays fluorescence (XRF) and differential scanning calorimetry (DSC). The results showed that the characteristics of biodiesel made from sunflower oil using resin A26 as a catalyst are in accordance with Brazilian biodiesel regulations, except the oxidative stability. The techniques used to characterize the resin showed that it is possible to reuse the resin after regeneration

A social and ecological assessment of tropical land uses at multiple scales: the Sustainable Amazon Network

Science has a critical role to play in guiding more sustainable development trajectories. Here, we present the Sustainable Amazon Network (Rede Amazonia Sustentavel, RAS): a multidisciplinary research initiative involving more than 30 partner organizations working to assess both social and ecological dimensions of land-use sustainability in eastern Brazilian Amazonia. The research approach adopted by RAS offers three advantages for addressing land-use sustainability problems: (i) the collection of synchronized and co-located ecological and socioeconomic data across broad gradients of past and present human use; (ii) a nested sampling design to aid comparison of ecological and socioeconomic conditions associated with different land uses across local, landscape and regional scales; and (iii) a strong engagement with a wide variety of actors and non-research institutions. Here, we elaborate on these key features, and identify the ways in which RAS can help in highlighting those problems in most urgent need of attention, and in guiding improvements in land-use sustainability in Amazonia and elsewhere in the tropics. We also discuss some of the practical lessons, limitations and realities faced during the development of the RAS initiative so far.Keywords: Social–ecological systems, Tropical forests, Land use, Interdisciplinary research, Sustainability, Trade-off

A social and ecological assessment of tropical land uses at multiple scales:the Sustainable Amazon Network

Science has a critical role to play in guiding more sustainable development trajectories. Here, we present the Sustainable Amazon Network (Rede Amazonia Sustentavel, RAS): a multidisciplinary research initiative involving more than 30 partner organizations working to assess both social and ecological dimensions of land-use sustainability in eastern Brazilian Amazonia. The research approach adopted by RAS offers three advantages for addressing land-use sustainability problems: (i) the collection of synchronized and co-located ecological and socioeconomic data across broad gradients of past and present human use; (ii) a nested sampling design to aid comparison of ecological and socioeconomic conditions associated with different land uses across local, landscape and regional scales; and (iii) a strong engagement with a wide variety of actors and non-research institutions. Here, we elaborate on these key features, and identify the ways in which RAS can help in highlighting those problems in most urgent need of attention, and in guiding improvements in land-use sustainability in Amazonia and elsewhere in the tropics. We also discuss some of the practical lessons, limitations and realities faced during the development of the RAS initiative so far