Pesquisa científica com Ideb em meio a pandemia de Covid-19: Uma análise de experiência municipal

This paper aims to report with the community part of the results found in a research project from a survey on the analysis of Ideb in Elementary and High Scholl in public schools. Taking this context into account, this study points out some factors that intend to continue empirical research during the new coronavirus disease (Covid-19) pandemic, due to the impossibility to attend the schools in this study to collect specific information, such as pedagogical, curricular, and administrative along with school managers, which limited the analysis of Ideb data under the interviewee's professional point of view. Even with the recommendations of social distancing, the research in question has not stopped. The way found for scholarship students to continue the data collection allows for some challenges to overcome, such as digital technology aligned with the research purpose, results from an articulated set of actions, practices, and resources developed by the researchers in question.  Este artigo tem como objetivo relatar parte dos resultados encontrados em um projeto de pesquisa sobre a análise do Ideb em escolas da rede pública de ensino da educação básica. A partir dessa conjuntura, o texto aponta alguns fatores que tencionam a continuidade de pesquisa empírica durante a pandemia do novo coronavírus, diante da impossibilidade de visitarmos presencialmente as escolas em estudo e recolher informações específicas - pedagógicas, curriculares e administrativas -  junto aos gestores escolares, o que limitou as análises dos dados do Ideb à perspectiva profissional do entrevistado. Mesmo com as recomendações de distanciamento social, a pesquisa em questão não parou. A forma encontrada para que os estudantes bolsistas dessem continuidade a coleta de dados permitem apresentar alguns desafios a serem superados, entre outros, o uso das tecnologias digitais alinhadas às finalidades da pesquisa, resultado de um conjunto articulado de ações, práticas e de recursos desenvolvidos para continuidade da pesquisa em questão

Arsenic toxicity in Acacia mangium willd. and mimosa Caesalpiniaefolia benth. seedlings

Acacia mangium and Mimosa caesalpiniaefolia are fast-growing woody fabaceous species that might be suitable for phytoremediation of arsenic (As)-contaminated sites. To date, few studies on their tolerance to As toxicity have been published. Therefore, this study assessed As toxicity symptoms in A. mangium and M. caesalpiniaefolia seedlings under As stress in a greenhouse. Seedlings of Acacia mangium and M. caesalpiniaefolia were grown for 120 d in an Oxisol-sand mixture with 0, 50, 100, 200, and 400 mg kg-1 As, in four replications in four randomized blocks. The plants were assessed for visible toxicity symptoms, dry matter production, shoot/root ratio, root anatomy and As uptake. Analyses of variance and regression showed that the growth of A. mangium and M. caesalpiniaefolia was severely hindered by As, with a reduction in dry matter production of more than 80 % at the highest As rate. The root/shoot ratio increased with increasing As rates. At a rate of 400 mg kg-1 As, whitish chlorosis appeared on Mimosa caesalpiniaefolia seedlings. The root anatomy of both species was altered, resulting in cell collapse, death of root buds and accumulation of phenolic compounds. Arsenic concentration was several times greater in roots than in shoots, with more than 150 and 350 mg kg-1 in M. caesalpiniaefolia and A. mangium roots, respectively. These species could be suitable for phytostabilization of As-contaminated sites, but growth-stimulating measures should be used