A large scale cascade model in the context of mathematics curriculum reform: Interactive factor of influence of multipliers’ work.

This study aims to know the influences identified by the multipliers on their work with schools, in order to understand the development of the cascade model implemented in the context of a Portuguese national large-scale programme for support mathematics teachers in mathematics curriculum change. 80 multipliers were surveyed with an open-ended questionnaire and the data were analysed with an inductive approach. Multipliers revealed they were affected by interrelated factors from different contexts: their colleagues, the scientific commission, the mathematics teachers and their schools and the Minister of Education. This suggests that the cascade model do not develop in a top down way, neither it is bottom up defined. Instead, it accommodates contrasting influences and its dynamics evolves as conditions change

The Effects of Maize Trade with Malawi on Price Levels in Mozambique: Implications for Trade and Development Policy

Resultados das investigações do Departamento de Análise de Políticas MAP-Direcção de Economíafood security, food policy, Mozambique, maize trade, International Relations/Trade, Q18,

PNAEQ - 13 years of post-analytical EQAS in Portugal

In the last 13 years, PNAEQ provided a specific program on post-analytical phase. In order to raise the offer of schemes in areas like Thrombosis/ Haemostasis, PNAEQ has established a consortium with ECAT Foundation distributing two more schemes: Post- Analytical Platelet Function and Pre- and Post-Analytical in Haemostasis. Furthermore, five of the analytical schemes organized by PNAEQ include a post-analytical interpretation, such as Blood Morphology, Hemoglobinopathies, Hydatidose, Rubella and Toxoplasmosis. The main objective of implementing specific and integrated programs on post-analytical phase is to evaluate the performance of laboratories on these matters in order to improve their quality service. The specific program on post-analytical phase provided by PNAEQ comprises 6 types of surveys: audits (vertical and presential), case simulation, case-study, document evaluation, quality indicators and questionnaires. Each survey represents a different tool to evaluate several items of the post-analytical process (Table 1), as well as the laboratory collaborators involved in each task (Figure 1). The items in evaluation are annually selected in the PNAEQ Working Group on Pre- and Post-Analytical Phase (created in 2015) and in compliance with the Portuguese Legislation and the ISO 15189:2012(E). Since 2007 PNAEQ has distributed 6 types of tools in the Post-Analytical Phase EQA, stabilizing in 3 of them in the last five years: Audits, Case Simulation and Quality Indicators. The participation rate has been increasing since 2015, which can be due to the multiple actions performed by PNAEQ Working Group on Pre- and Post-Analytical Phase. In addition, the Case Simulation surveys are the most participated (74% average) since the participation depends on PNAEQ. For the future, PNAEQ and the Working Group will work on the continuous update of the tools content distributed in each survey according to international references and the experience of other EQA organizers.N/

Explorar tarefas matemáticas

O artigo discute o conceito de tarefa matemática e apresenta diferentes tipos de tarefas matemáticas. Discute ainda o uso das tarefas matemáticas em aula e aponta questões inerentes e esse uso, em especial relacionadas com o nível cognitivo das tarefas e da sua adaptação

Avaliação do potencial antioxidante dos extratos da folha da goiaba-serrana (Acca sellowiana (O. Berg.) Burret)

TCC (graduação) - Universidade Federal de Santa Catarina. Centro Tecnológico. Engenharia de Alimentos.A goiaba-serrana é uma fruta nativa do planalto meridional brasileiro e que apresenta uma série de propriedades bioativas, como propriedades antioxidantes e antimicrobianas, porém ainda é muito pouco conhecida pela população brasileira. Com isso, o objetivo do presente trabalho foi determinar a atividade antioxidante dos extratos da folha da goiaba-serrana obtidos por métodos de extração a baixa pressão. Os extratos foram obtidos em estudo paralelo através de aplicação dos métodos Soxhlet e Extração Assistida por Ultrassom (EAU), com uso de solventes etanol, água e a mistura etanol-água (50:50 v/v). Neste trabalho, a atividade antioxidante dos extratos foi analisada e determinada pelas técnicas de captura do radical DPPH, inibição do radical ABTS e redução do íon férrico (FRAP). Os principais resultados foram com relação ao método de captura do radical DPPH, no qual todos os resultados obtiveram valores de EC50 considerados “muito ativos”, destacando-se os valores obtidos pelas análises dos extratos adquiridos pelo solvente etanol-água. Para as análises de ABTS e FRAP, os melhores resultados foram da extração assistida por ultrassom sonda (1704,14 µM TEAC/g) e da extração por Soxhlet (285,40 µM Trolox/g), respectivamente e ambos com o solvente etanol-água. Concluindo, os resultados observados no presente trabalho apontam os extratos de goiaba-serrana como potenciais fontes de antioxidantes naturais e indicam uma possibilidade de aplicação em indústria de alimentos.The pineapple guava is a native fruit of the highlands of southern Brazil and presents a series of bioactive properties, like antioxidant and antimicrobial properties, but is a fruit practically unknown to the Brazilian population. Therefore, the objective of the present work is to determine the antioxidant activity of pineapple guava leaf extracts obtained by low pressure extraction methods. The extracts were obtained in a parallel study through application of Soxhlet, US and UB, using ethanol, water and a mixture of ethanol-water (50:50 v/v) as solvents. In this study, the antioxidant activity (AA) of the extracts was determined by the techniques of free radical scavenging activity (DPPH), ABTS radical scavenging assay and Ferric Reducing/Antioxidant Potential (FRAP). The best antioxidants activity was showed by the free radical scavenging activity (DPPH), in which all the results obtained for EC50 are considered "very active", highlighting the values obtained by the analyzes of the extracts acquired by the solvent ethanol-water. The analysis of ABTS and FRAP have the best results to US (1704.14 μM TEAC / g) and Soxhlet (285.40 μM Trolox / g), respectively and both with the ethanol-water solvent. In conclusion, the results observed in the present study point out the extractions of pineapple guava as potential sources of natural antioxidants and indicate a possibility of application in the food industry

Relatório final da aplicação da grelha RST02 na Bacia Hidrográfica da Ribeira do Poço das Patas, Porto

WAT - Projecto Water and Territorie